Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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SYSTEM AND METHOD FOR SECURING ENERGY MANAGEMENT
SYSTEMS
BACKGROUND
[00011 With the advent of high technology needs and market deregulation,
today's
energy market has become very dynamic. High technology industries have
increased
their demands on the electrical power supplier, requiring more power,
increased
reliability and lower costs. A typical computer data center may use 100 to 300
watts of
energy per square foot compared to an average of 15 watts per square foot for
a typical
commercial building. Further, an electrical outage, whether it is a complete
loss of
power or simply a drop in the delivered voltage, can cost these companies
millions of
dollars in down time and lost business.
[0002] In addition, deregulation of the energy industry is allowing both
industrial and
individual consumers the unprecedented capability to choose their supplier
which is
fostering a competitive supply/demand driven market in what was once a
traditionally
monopolistic industry.
[0003] The requirements of increased demand and higher reliability are
burdening an
already overtaxed distribution network and forcing utilities to invest in
infrastructure
improvements at a time when the deregulated competitive market is forcing them
to cut
costs and lower prices. Accordingly, there is a need for a system of managing
the
distribution and consumption of electrical power which meets the increased
demands of
users and allows the utility supplier to compete in a deregulated competitive
marketplace.
SUMMARY OF THE INVENTION
[0003a] In accordance with one aspect of the invention there is provided an
energy management device for use in an energy management architecture for
managing
an energy distribution system, the energy management architecture including a
network.
The energy management device includes an energy distribution system interface
operative to couple the energy management device with at least a portion of
the energy
distribution system. The energy management device also includes a network
interface
operative to couple the energy management device with the network for
transmitting
outbound communications to the network and receiving inbound communications
from
the network, the inbound communications including first energy management data
and
the outbound communications including second energy management data. The
energy
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management device further includes a processor coupled with the network
interface and
the energy distribution system interface, the processor operative to perform
at least one
energy management function on the at least the portion of the energy
distribution
network system via the energy distribution system interface, the processor
further
operative to process the first energy management data and generate the second
energy
management data as a function of the energy management function. At least one
of the
inbound communications includes at least one secured inbound communication and
the
network interface further includes a security module operative to selectively
encrypt the
outbound communications and validate the at least one secured inbound
communications.
[0003b] In accordance with another aspect of the invention there is provided a
method of communicating by an energy management device, the energy management
device for use in an energy management architecture for managing an energy
distribution system, the energy management architecture including a network.
The
method involves coupling the energy management device with at least a portion
of the
energy distribution system, and coupling the energy management device with the
network. The energy management device is capable of transmitting outbound
communications to the network and receiving inbound communications from the
network. The inbound communications include first energy management data and
the
outbound communications include second energy management data. At least one of
the
inbound communications includes at least one secured inbound communication.
The
method also involves performing at least one energy management function on the
at
least a portion of the energy distribution network via the energy distribution
system, and
processing the first energy management data and generating the second energy
management data as a function of the energy management function. The method
further involves selectively encrypting the outbound communications and
validating the
at least one secured inbound communication.
[0003c] In accordance with another aspect of the invention there is provided
an
energy management device for use in an energy management architecture for
managing
an energy distribution system, the energy management architecture including a
network.
The energy management device includes an energy distribution system interface,
provisions for coupling the energy management device with at least a portion
of the
energy distribution system, and network interface provisions for coupling the
energy
management device with the network for transmitting outbound communications to
the
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network and receiving inbound communications from the network. The inbound
communications include first energy management data and the outbound
communications include second energy management data. The device also includes
provisions for processing coupled with the network interface and the energy
distribution
system interface, the provisions for processing operably configured to perform
at least
one energy management function on the at least the portion of the energy
distribution
system via the energy distribution system interface and to process the first
energy
management data and generate the second energy management data as a function
of the
energy management function. At least one of the inbound communications
includes at
least one secured inbound communication and the network interface provisions
further
including security module provisions for securing the outbound communications
and
validating the at least one secured inbound communication.
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] Figure 1 illustrates a first embodiment of the Power Management
Architecture.
[0005] Figure 2a illustrates an IED, for use with the embodiment of Figure 1,
containing several power management components.
[0006] Figure 2b illustrates another IED, for use with the embodiment of
Figure 1,
containing several power management components.
[0007] Figure 3a illustrates an IED, for use with the embodiment of Figure 1,
connected to a power system.
[0008] Figure 3b illustrates the internal components of an IED for use with
the
embodiment of Figure 1.
[0009] Figure 3c illustrates a preferred protocol stack of an IED for use with
the
embodiment of Figure 1.
[0010] Figure 4a illustrates an IED, for use with the embodiment of Figure 1,
coupled
with power management components.
[0011] Figure 4b illustrates the use of a power management application
component.
[0012] Figure 5a illustrates a preferred embodiment with multiple energy
suppliers.
[0013] Figure 5b illustrates a preferred method of managing multiple suppliers
for use
with the embodiment of Figure 1.
[0014] Figure 6 illustrates a second embodiment using a distributed power
management component.
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[0015] Figure 7 illustrates a third embodiment using a power reliability
component.
[0016] Figure 8 illustrates a fourth embodiment using a peer to peer
component.
[0017] Figure 9 illustrates an IED, for use with the embodiment of Figure 1,
transmitting data to multiple recipients.
[0018] Figure 10 illustrates a monitoring server, for use with the embodiment
of
Figure 1, receiving data from an IED.
[0019] Figure 11 illustrates an exemplary display generated by the embodiment
of
Figure 10.
[0020] Figure 12 depicts one embodiment EM system having various EM
Components communicating and using Security Services; and
[0021] Figure 13 depicts another embodiment of an EM System.
DETAILED DESCRIPTION OF THE DRAWINGS AND PRESENTLY
PREFERRED EMBODIMENTS
[0022] Intelligent electronic devices ("IEDs") such as programmable logic
controllers
("PLCs"), Remote Terminal Units ("RTUs"), electric/watt hour meters,
protection
relays and fault recorders are widely available that make use of memory and
microprocessors to provide increased versatility and additional functionality.
Such
functionality includes the ability to communicate with remote computing
systems,
either via a direct connection, e.g. modem or via a network. For more detailed
information regarding IEDs capable of network communication, please refer to
U.S.
Patent Publication 20030101008A1. In particular, the monitoring of electrical
power,
especially the measuring and calculating of electrical parameters, provides
valuable
information for power utilities and their customers. Monitoring of electrical
power is
important to ensure that the electrical power is effectively and efficiently
generated,
distributed and utilized. Various different arrangements are presently
available for
monitoring, measuring, and controlling power parameters. Typically, an IED,
such as
an individual power measuring device, is placed on a given branch or line
proximate to
one or more loads which are coupled with the branch or line in order to
measure/monitor power system parameters. Herein, the phrase "coupled with" is
defined to mean directly connected to or indirectly connected with through one
or more
intermediate components. Such intermediate components may include both
hardware
and software based components. In addition to monitoring power parameters of a
certain load(s), such power monitoring devices have a variety of other
applications. For
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example, power monitoring devices can be used in supervisory control and data
acquisition ("SCADA") systems such as the XA/21 Energy Management System
manufactured by GE Harris Energy Control Systems located in Melbourne,
Florida.
[0023) In a typical SCADA application, IEDs/power measuring devices
individually
5 dial-in to a central SCADA computer system via a modem. However, such dial-
in
systems are limited by the number of inbound telephone lines to the SCADA
computer
and the availability of phone service access to the IED/power measuring
devices. With
a limited number of inbound telephone lines, the number of IEDs/power
measuring
devices that can simultaneously report their data is limited resulting in
limited data
throughput and delayed reporting. Further, while cellular based modems and
cellular
system access are widely available, providing a large number of power
measuring
devices with phone service is cumbersome and often cost prohibitive. The
overall result
is a system that is not easily scalable to handle a large number of IEDs/power
measuring devices or the increased bandwidth and throughput requirements of
advanced power management applications. However, the ability to use a computer
network infrastructure, such as the Internet, allows for the use of power
parameter and
data transmission and reporting on a large scale. The Internet provides a
connectionless
point to point communications medium that is capable of supporting
substantially
simultaneous communications among a large number of devices. For example this
existing Internet infrastructure can be used to simultaneously push out
billing, load
profile, or power quality data to a large number of IED/power measurement and
control
devices located throughout a power distribution system that can be used by
those
devices to analyze or make intelligent decisions based on power consumption at
their
locations. The bandwidth and throughput capabilities of the Internet support
the
additional requirements of advanced power management applications. For
example,
billing data, or other certified revenue data, must be transferred through a
secure
process which prevents unauthorized access to the data and ensures receipt of
the data
by the appropriate device or entity. Utilizing the Internet, communications
can be
encrypted such as by using encrypted email. Further, encryption authentication
parameters such as time/date stamp or the IED serial number, can be employed.
Within
the Internet, there are many other types of communications applications that
may be
employed to facilitate the above described inter-device communications such as
email,
Telnet, file transfer protocol ("FTP"), trivial file transfer protocol
("TFTP") or
proprietary systems, both unsecured and secure/encrypted.
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[0024] As used herein, Intelligent electronic devices ("IEDs") include
Programmable
Logic Controllers ("PLCs"), Remote Terminal Units ("RTUs"), electric power
meters,
protective relays, fault recorders and other devices which are coupled with
power
distribution networks to manage and control the distribution and consumption
of
electrical power. Such devices typically utilize memory and microprocessors
executing
software to implement the desired power management function. IEDs include on-
site
devices coupled with particular loads or portions of an electrical
distribution system and
are used to monitor and manage power generation, distribution and consumption.
IEDs
are also referred herein as power management devices ("PMDs").
[0025] A Remote Terminal Unit ("RTU") is a field device installed on an
electrical
power distribution system at the desired point of metering. It is equipped
with input
channels (for sensing or metering), output channels (for control, indication
or alarms)
and a communications port. Metered information is typically available through
a
communication protocol via a serial communication port. An exemplary RTU is
the XP
Series, manufactured by Quindar Productions Ltd. in Mississauga, Ontario,
Canada.
[0026] A Programmable Logic Controller ("PLC") is a solid-state control system
that
has a user-programmable memory for storage of instructions to implement
specific
functions such as Input/output (UO) control, logic, timing, counting, report
generation,
communication, arithmetic, and data file manipulation. A PLC consists of a
central
processor, input\output interface, and memory. A PLC is designed as an
industrial
control system. An exemplary PLC is the SLC 500 Series, manufactured by Allen-
Bradley in Milwaukee, Wisconsin.
[0027] A meter, is a device that records and measures power events, power
quality,
current, voltage waveforms, harmonics, transients and other power
disturbances.
Revenue accurate meters ("revenue meter") relate to revenue accuracy
electrical power
metering devices with the ability to detect, monitor, report, quantify and
communicate
power quality information about the power which they are metering. An
exemplary
meter is the model 8500 meter, manufactured by Power Measurement Ltd, in
Saanichton, B.C. Canada.
[0028] A protective relay is an electrical device that is designed to
interpret input
conditions in a prescribed manner, and after specified conditions are met, to
cause
contact operation or similar abrupt change in associated electric circuits. A
relay may
consist of several relay units, each responsive to a specified input, with the
combination
of units providing the desired overall performance characteristics of the
relay. Inputs
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are usually electric but may be mechanical, thermal or other quantity, or a
combination
thereof. An exemplary relay is the type N and KC, manufactured by ABB in
Raleigh,
North Carolina.
[0029] A fault recorder is a device that records the waveform and digital
inputs, such
as breaker status which resulting from a fault in a line, such as a fault
caused by a break
in the line. An exemplary fault recorder is the IDM, manufactured by Hathaway
Corp in
Littleton, CO.
[0030] IEDs can also be created from existing electromechanical meters or
solid-state
devices by the addition of a monitoring and control device which converts the
mechanical rotation of the rotary counter into electrical pulses or monitors
the pulse
output of the meter. An exemplary electromechanical meter is the ABI Meter
manufactured by ABB in Raleigh, North Carolina. Such conversion devices are
known
in the art.
[0031] The disclosed embodiments relate to a communications architecture that
can
be used for monitoring, protection and control of devices and electrical power
distribution in an electrical power distribution system, where IEDs can
interact with
other IEDs and attached devices.
[0032] As will be described in more detail below, a power management
architecture
for an electrical power distribution system, or portion thereof, is disclosed.
The
architecture provides a scalable and cost effective framework of hardware and
software
upon which power management applications can operate to manage the
distribution and
consumption of electrical power by one or more utilities/suppliers and/or
customers
which provide and utilize the power distribution system.
[0033] Power management applications include automated meter reading
applications, load shedding applications, deregulated supplier management
applications,
on-site power generation management applications, power quality management
applications, protection/safety applications, and general distribution system
management applications, such as equipment inventory and maintenance
applications.
A power management application typically includes one or more application
components which utilize the power management architecture to interoperate and
communicate thereby implementing the power management application.
[0034] The architecture includes Intelligent Electronic Devices ("IEDs")
distributed
throughout the power distribution system to monitor and control the flow of
electrical
power. IEDs may be positioned along the supplier's distribution path or within
a
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customer's internal distribution system. IEDs include revenue electric watt-
hour meters,
protection relays, programmable logic controllers, remote terminal units,
fault recorders
and other devices used to monitor and/or control electrical power distribution
and
consumption. As was noted, IEDs also include legacy mechanical or
electromechanical
devices which have been retrofitted with appropriate hardware and/or software
so as to
be able to integrate with the power management architecture. Typically an IED
is
associated with a particular load or set of loads which are drawing electrical
power from
the power distribution system. As was described above, the IED may also be
capable of
receiving data from or controlling its associated load. Depending on the type
of IED
and the type of load it may be associated with, the IED implements a power
management function such as measuring power consumption, controlling power
distribution such as a relay function, monitoring power quality, measuring
power
parameters such as phasor components, voltage or current, controlling power
generation
facilities, or combinations thereof. For functions which produce data or other
results,
the IED can push the data onto the network to another IED or back end server,
automatically or event driven, (discussed in more detail below) or the IED can
wait for
a polling communication which requests that the data be transmitted to the
requestor.
[0035] In addition, the IED is also capable of implementing an application
component
of a power management application utilizing the architecture. As was described
above
and further described below, the power management application includes power
management application components which are implemented on different portions
of
the power management architecture and communicate with one another via the
architecture network. The operation of the power management application
components
and their interactions/communications implement the power management
application.
One or more power management applications may be utilizing the architecture at
any
given time and therefore, the IED may implement one or more power management
application components at any given time.
[0036] The architecture further includes a communications network. Preferably,
the
communication network is a publicly accessible data network such as the
Internet or
other network or combination of sub-networks that transmit data utilizing the
transport
control protocol/internet protocol ("TCP/IP") protocol suite. Such networks
include
private intranet networks, virtual private networks, extranets or combinations
thereof
and combinations which include the Internet. Alternatively, other
communications
network architectures may also be used. Each IED preferably includes the
software
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and/or hardware necessary to facilitate communications over the communications
network by the hardware and/or software which implements the power management
functions and power management application components. In alternative
embodiments,
quality of service protocols can be implemented to guarantee timely data
delivery,
especially in real time applications.
[0037] The hardware and/or software which facilitate network communications
preferably includes a communications protocol stack which provides a standard
interface to which the power management functions hardware/software and power
management application components hardware/software interact. As will be
discussed
in more detail below, in one embodiment, the communications protocol stack is
a
layered architecture of software components. In the preferred embodiments
these layers
or software components include an applications layer, a transport layer, a
routing layer,
a switching layer and an interface layer.
[0038] The applications layer includes the software which implements the power
management functions and the power management applications components.
Further,
the applications layer also includes the communication software applications
which
support the available methods of network communications. Typically, the power
management function software interacts with the power management hardware to
monitor and or control the portion of the power distribution system and/or the
load
coupled with the IED. The application component typically interacts with the
power
management function software to control the power management function or
process
data monitored by the power management function. One or both of the power
management function software and the power management application component
software interacts with the communication software applications in order to
communicate over the network with other devices.
[0039] The communications applications include electronic mail client
applications
such as applications which support Simple Mail Transfer Protocol (SMTP),
Multipurpose Internet Mail Extensions (MIME) or Post Office Protocol (POP)
network
communications protocols, security client applications such as
encryption/decryption or
authentication applications such as secure-HTTP or secure sockets layer
("SSL"), or
other clients which support standard network communications protocols such as
telnet,
hypertext transport protocol ("HTTP"), file transfer protocol ("FTP"), network
news
transfer protocol ("NNTP"), instant messaging client applications, or
combinations
thereof. Other client application protocols include extensible markup language
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("XML") client protocol and associated protocols such as Simple Object Access
Protocol ("SOAP"). Further, the communications applications could also include
client
applications which support peer to peer communications. All of the
communications
applications preferably include the ability to communicate via the security
client
5 applications to secure the communications transmitted via the network from
unauthorized access and to ensure that received communications are authentic,
uncompromised and received by the intended recipient. Further, the
communications
applications include the ability to for redundant operation through the use of
one or
more interface layer components (discussed in more detail below), error
detection and
10 correction and the ability to communicate through firewalls or similar
private network
protection devices.
[0040] The transport layer interfaces the applications layer to the routing
layer and
accepts communications from the applications layer that are to be transmitted
over the
network. The transport layer breaks up the communications layer into one or
more
packets, augments each packet with sequencing data and addressing data and
hands
each packet to the routing layer. Similarly, packets which are received from
the network
are reassembled by the transport layer and the re-constructed communications
are then
handed up to the applications layer and the appropriate communications
applications
client. The transport layer also ensures that all packets which make up a
given
transmission are sent or received by the intended destination. Missing or
damaged
packets are re-requested by the transport layer from the source of the
communication. In
the preferred embodiment, the transport layer implements the transport control
protocol
("TCP").
[0041] The routing layer interfaces the transport layer to the switching
layer. The
routing layer routes each packet received from the transport layer over the
network. The
routing layer augments each packet with the source and destination address
information.
In the preferred embodiment, the routing layer implements the internet
protocol ("IP").
It will be appreciated that the TCP/IP protocols implement a connectionless
packet
switching network which facilitates scalable substantially simultaneous
communications among multiple devices.
[0042] The switching layer interfaces the routing layer to the interface
layer. The
switching layer and interface layer are typically integrated. The interface
layer
comprises the actual hardware interface to the network. The interface layer
may include
an Ethernet interface, a modem, such as wired modem using the serial line
interface
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protocol ("SLIP") or point to point protocol ("PPP"), wired modem which may be
an
analog or digital modem such as a integrated services digital network ("ISDN")
modem
or digital subscriber line ("DSL") modem, or a cellular modem. Further, other
wireless
interfaces, such as Bluetooth, may also be used. In addition, AC power line
data
network interface may also be used. Cellular modems further provide the
functionality
to determine the geographic location of the IED using cellular RF
triangulation. Such
location information can be transmitted along with other power management data
as
one factor used in authenticating the transmitted data. In the preferred
embodiments, the
interface layer provided allows for redundant communication capabilities. The
interface
layer couples the IED with a local area network, such as provided at the
customer or
utility site. Alternatively, the interface layer can couple the IED with a
point of presence
provided by a local network provider such as an internet service provider
("ISP").
[00431 Finally, the architecture includes back-end server computers or data
collection
devices. Back end servers may be provided by the consumer of electric power,
the
utility supplier of electric power or a third party. In one embodiment, these
devices are
IEDs themselves. The back end servers are also coupled with the network in a
same
way as the IEDs and may also include a communication protocol stack. The back
end
servers also implement power management applications components which interact
and
communicate with the power management application components on the IEDs to
accomplish the power management application. Preferably, the IEDs are
programmed
with the network addresses of the appropriate back end servers or are capable
of
probing the network for back end servers to communicate with. Similarly, the
back end
server is programmed with the network addresses of one or more affiliate IEDs
or is
capable of probing the network to find IEDs that are connected. In either case
of
network probing by the IED or back-end server, software and/or hardware is
provided
to ensure that back-end servers communicate with authorized IEDs and vice
versa
allowing multiple customers and multiple suppliers to utilize the architecture
for
various power management applications without interfering with each other.
[0044] The back end servers preferably are executing software application
counterparts to the application clients and protocols operating on the IEDs
such as
electronic mail, HTTP, FTP, telnet, NNTP or XML servers which are designed to
receive and process communications from the IEDs. Exemplary server
communications
applications include Microsoft ExchangeTM. The back end server is therefore
capable of
communicating, substantially simultaneously, with multiple IEDs at any given
time.
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Further, the back end server implements a security application which decrypts
and/or
authenticates communications received from IEDs and encrypts communications
sent to
IEDs.
[00451 In one embodiment, software executing on the back end server receives
communications from an IED and automatically extracts the data from the
communication. The data is automatically fed to a power management application
component, such as a billing management component.
[00461 In this way, a generally accessible connectionless/scalable
communications
architecture is provided for operating power management applications. The
architecture
facilitates IED-supplier communications applications such as for automated
meter
reading, revenue collection, IED tampering and fraud detection, power quality
monitoring, load or generation control, tariff updating or power reliability
monitoring.
The architecture also supports IED-consumer applications such as usage/cost
monitoring, IED tampering and fraud detection, power quality monitoring, power
reliability monitoring or control applications such as load shedding/cost
control or
generation control. In addition, real time deregulated utility/supplier
switching
applications which respond in real time to energy costs fluctuations can be
implemented
which automatically switch suppliers based on real time cost. Further the
architecture
supports communications between IEDs such as early warning systems which warn
downstream IEDs of impending power quality events. The architecture also
supports
utility/supplier to customer applications such as real time pricing reporting,
billing
reporting, power quality or power reliability reporting. Customer to customer
applications may also be supported wherein customers can share power quality
or
power reliability data.
[00471 As used herein, an IED or PMD is a power management device capable of
network communication. A back end server is a data collection or central
command
device coupled with the network which receives power management data from an
IED
and/or generates power management commands to and IED. An IED may contain a
back-end server. The network is any communications network which supports the
Transport Control Protocol/Internet Protocol ("TCP/IP") network protocol
suite. In the
preferred embodiment IEDs include devices such as PLCs, RTUs, meters,
protection
relays, fault recorders or modified electromechanical devices and further
include any
device which is coupled with an electrical power distribution network, or
portion
thereof, for the purpose of managing or controlling the distribution or
consumption of
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electrical power.
[0048] Figure 1 illustrates an overview of the preferred embodiment of the
Power
Management Architecture ("architecture") 100, which contains one or more IEDs
102,
103, 104, 105, 106, 107, 108, 109 and respective loads 150, 151, 152, 154,
155, 156,
and 157. The IEDs 102-109 are connected to an electrical power distribution
system
101, or portion thereof, to measure, monitor and control quality, distribution
and
consumption of electric power from the system 101, or portion thereof. The
power
distribution system is typically owned by either a utility/supplier or
consumer of electric
power however some components may be owned and/or leased from third parties.
The
IEDs 102-109 are further interconnected with each other and back end servers
120, 121,
122, 123, 124 via a network 110 to implement a Power Management Application
("application") 211 (shown in Figure 2a). In the preferred embodiment, the
network 110
is the Internet. Alternatively, the network 110 can be a private or public
intranet, an
extranet or combinations thereof, or any network utilizing the Transport
Control
Protocol/Internet Protocol ("TCP/IP") network protocol suite to enable
communications, including IP tunneling protocols such as those which allow
virtual
private networks coupling multiple intranets or extranets together via the
Internet. The
network 110 may also include portions or sub-networks which use wireless
technology
to enable communications, such as RF, cellular or Bluetooth technologies. The
network
110 preferably supports application protocols such as telnet, FTP, POP3, SMTP,
NNTP,
Mime, HTTP, SMTP, SNNP, IMAP, proprietary protocols or other network
application
protocols as are known in the art as well as transport protocols SLIP, PPP,
TCP/IP and
other transport protocols known in the art.
[0049] The Power Management Application 211 utilizes the architecture 100 and
comprises power management application components which implement the
particular
power management functions required by the application 211. The power
management
application components are located on the IED 102-109 or on the back end
server 121-
124, or combinations thereof, and can be a client component, a server
component or a
peer component. Application components communicate with one another over the
architecture 100 to implement the power management application 211.
[0050] In one preferred embodiment the architecture 100 comprises IEDs 102-109
connected via a network 110 and back end servers 120, 121, 122, 123, 124 which
further comprise software which utilizes protocol stacks to communicate. IEDs
102-109
can be owned and operated by utilities/suppliers 130, 131, consumers 132, 133
or third
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parties 134 or combinations thereof. Back end servers 120, 121, 122, 123, 124
can be
owned by utilities/suppliers 130, 131, consumers 132, 133, third parties 134
or
combinations thereof. For example, an IED 102-109 is operable to communicate
directly over the network with the consumer back-end server 120, 121, another
IED
102-109 or a utility back end server 123, 124. In another example, a utility
back end
server 123, 124 is operable to connect and communicate directly with customer
back
end servers 120, 121. Further explanation and examples on the types of data
and
communication between IEDs 102-109 are given in more detail below.
[0051] Furthermore, the architecture's 100 devices, such as the back end
servers 120-
124 or IEDs 102-109, can contain an email server and associated communications
hardware and software such as encryption and decryption software. Other
transfer
protocols, such as file transfer protocols (FTP), Simple Object Access
Protocol (SOAP),
HTTP, XML or other protocols know in the art may also be used in place of
electronic
mail. Hypertext Transfer Protocol (HTTP) is an application protocol that
allows transfer
of files to devices connected to the network. FTP is a standard internet
protocol that
allows exchange of files between devices connected on a network. Extensible
markup
language (XML) is a file format similar to HTML that allows transfer of data
on
networks. XML is a flexible, self describing, vendor-neutral way to create
common
information formats and share both the format and the data over the
connection. In the
preferred embodiment the data collection server is operable by either the
supplier/utility
130, 131 or the customer 132, 133 of the electrical power distribution system
101.
SOAP allows a program running one kind of operating system to communicate with
the
same kind, or another kind of operating system, by using HTTP and XML as
mechanisms for the information exchange.
[0052] Furthermore, the application 211 includes an authentication and
encryption
component which encrypts commands transmitted across the network 110, and
decrypts
power management data received over the network 110. Authentication is also
performed for commands or data sent or received over the network 110.
Authentication
is the process of determining and verifying whether the IED 102-109
transmitting data
or receiving commands is the IED 102-109 it declares itself to be and in the
preferred
embodiment authentication includes parameters such as time/date stamps,
digital
certificates, physical locating algorithms such as cellular triangulation,
serial or tracking
IDs, which could include geographic location such as longitude and latitude.
Authentication prevents fraudulent substitution of TED 102-109 devices or
spoofing of
CA 02462212 2011-01-10
IED 102-109 data generation in an attempt to defraud. Authentication also
minimizes
data collection and power distribution system 101 control errors by verifying
that data
is being generated and commands are being received by the appropriate devices.
In the
preferred embodiment encryption is done utilizing Pretty Good Privacy (PGP).
PGP
5 uses a variation of public key system, where each user has a publicly known
encryption
key and a private key known only to that user. The public key system and
infrastructure
enables users of unsecured networks, such as the internet, to securely and
privately
exchange data through the use of public and private cryptographic key pairs.
[00531 In the preferred embodiment the architecture is connectionless which
allows
10 for substantially simultaneous communications between a substantial number
of IEDs
within the architecture. This form of scalability eclipses the current
architectures that
utilize point to point connections, such as provided by telephony networks,
between
devices to enable communications which limit the number of simultaneous
communications that may take place.
15 [00541 Figure 2a illustrates a preferred embodiment where an IED 200
contains
several power management components 201, 202, 203 and power management
circuitry
220. The power management circuitry 220 is operable to implement the IEDs
functionality, such as metering/measuring power delivered to the load 218 from
the
electrical power distribution system 216, measuring and monitoring power
quality,
implementing a protection relay function, or other functionality of the IED
200. The
IED 200 further includes a power management application components 211 coupled
with the circuitry 220 and a protocol stack 212 and data communication
interface 213.
The protocol stack 212 and data communications interface 213 allow the IED 200
to
communicate over the network 215. It will be appreciated that, as described
below, the
protocol stack 212 may include an interface layer which comprises the data
communications interface 213. The power management application components 211
include software and/or hardware components which, alone, or in combination
with
other components, implement the power management application 211. The
components
201, 202, 203 may include components which analyze and log the
metered/measured
data, power quality data or control operation of the IED 200, such as
controlling a relay
circuit. The components 201, 202, 203 further include software and/or hardware
which
processes and communicates data from the IED 200 to other remote devices over
the
network 215, such as back end servers 121-124 or other IEDs 200 (102-109), as
will be
described below. For example, the IED 200 is connected to a load 218. The
power
CA 02462212 2011-01-10
16
management circuitry 220 includes data logging software applications, memory
and a
CPU, which are configured to store kWh data from the load 218 in a memory
contained
within the power management circuitry. The stored data is then read and
processed by
the components 201, 202, 203 in the power management application 211. The
components communicate with operating system components which contain the
protocol stack 212 and the processed data is passed over the network 215 to
the
appropriate party via the data communications interface 213. One or more of
the
components 201, 202, 203 may communicate with one or more application
components
located on one or other IEDs 200 and/or one or more back end servers 121-124.
10055] Figure 2b illustrates an alternate preferred embodiment where an IED
240 is
provided which includes power management application components 290. A load
280 is
connected to an IED 240 via the electrical power distribution system 281. The
IED 240
is further connected to the network 283. The IED 240 contains power management
circuitry 282 which is operable to implement the IEDs functionality, such as
receiving
power and generating data from the load 280. The IED further includes a
protocol stack
layer 284 and a data communication interface 286 which allows the back end
server to
communicate over the network 283. The power management application components
290 include one or more components such as data collection component 250, an
automated meter reading component 253 and a billing/revenue management
component
252, which may be revenue certified, a peer-to-peer power management component
257, a usage and consumption management component 258, a distributed power
management component 254, a centralized power management component 255, a load
management component 259, an electrical power generation management component
260, an IED inventory component 261, an IED maintenance component 262, an IED
fraud detection component 263, a power quality monitoring component 264, a
power
outage component 265, a device management component 251, a power reliability
component 256, or combinations thereof. Furthermore, components contained on
one
IED 240 may operate simultaneously with components on an IED 102-109, 200 or
another IED 240 or back end server (not shown). More component details and
examples
are given below.
[0056] In one embodiment the application components comprise software
components, such as an email server or an XML or HTTP server. These servers
may
include a Microsoft Exchange server or a BizTalk framework/XML compatible
server.
A Microsoft Exchange TM server is an email server computer program
manufactured by
CA 02462212 2011-01-10
17
Microsoft Corporation, located in Redmond, Washington, typically operating on
a
server computer which facilitates the reception and transmission of emails,
and
forwards emails to the email client programs, such as Microsoft Outlook, of
users
that have accounts on the server. BizTalk is a computer industry initiative
which
promotes XML as the common data exchange for e-commerce and application
integration over the internet. BizTalk provides frameworks and guidelines for
how to
publish standard data structures in XML and how to use XML messages to
integrate
software components or programs. Alternately, hardware components, such as a
dedicated cellular phone, GPS encryption or decryption key or dongle are
included in
the components. In a further embodiment, a combination of both hardware and
software
components are utilized. Additionally, referring back to Figure 1, one or more
power
management application components 290 can utilize the architecture 100 to
implement
their functionality. For example, a utility 130 has a back end server 124
which contains
power management application and associated components, such as a usage and
consumption management component 258. The utility 130 supplies power to a
consumer 132 via the network 110 and monitors the consumers power consumption
using the power management application components on the back end server 124
which
communicates with the IEDs 104, 105, 108 via the network 110 to retrieve
measured
consumption/usage data. The consumer 132 concurrently monitors usage of loads
150,
151, 152, and 153, where generator 152 supplies power to usage load 153, using
an
IED 104, 105, 108 which is connected to the network 110, computing real time
costs
posted by the utility 130. A second customer 133 can also concurrently monitor
usage
loads 155, 156, 157, where generator 154 supplies power to the usage load 157.
In one
embodiment, the consumer 132 monitors usage using back end server 120 which
receives usage and consumption data from the IEDs 104, 105, 108 via the
network 110.
The IED 104, 105, 108 implements power management application components such
as
load management components and billing management components. The back end
server 120, 124 implements power management application components such as a
data
collection component, a billing/revenue management component, an automated
meter
reading component or a usage/consumption management component. The components
on the IED 104, 105, 108 work in concert with the components on the back end
server
120, 124 via the network 110 to implement the overall power management
application.
In a further embodiment, one or more power management application components
are
operating on IED 104, 105, 108 and/or back end servers 120, 124 at any given
time.
CA 02462212 2011-01-10
18
Each power management application can be utilized by one or more users, or
different
applications can be used by different users. Moreover, the application
components can
exist on the same or different IEDs 104, 105, 108 or back end servers 120,
124.
[0057] In the preferred embodiment, the data collection component 250 enables
an IED
to collect and collate data from either a single or multiple sources via the
network 110.
The data collected by the component is stored and can be retrieved by other
components
of the power management application components 290, or other components
implemented on other IEDs 102-109 located on the network 110. In the preferred
embodiment the Automated Meter Reading component 253 is utilized to allow
either
the consumers 132, 133 or providers 130, 131 to generate power management
reports
from the IED data. In the preferred embodiment the electrical power generation
management component 260 analyzes data received from IEDs 102-109 to either
minimize or maximize measured or computed values such as revenue, cost,
consumption or usage by use of handling and manipulating power systems and
load
routing. IED inventory, maintenance and fraud detection component 261, 262,
263
receive or request communications from the IEDs 102-109 allowing the power
management application to inventory the installed base of IEDs 102-109,
including
establishing or confirming their geographic installation location, or check
the
maintenance history of all connected IEDs 102-109. These power management
applications aid in confirming outage locations or authenticating
communications to or
from an IED 102-109 to prevent fraud and minimize errors. In one embodiment,
the
IED inventory component 261 utilizes cellular triangulation technologies, or
caller ID
based geographic locator technologies to determine and verify IED inventories.
In the
preferred embodiment the fraud detection component 263 further detects device
tampering. In the preferred embodiment the power quality monitoring component
264
monitors and processes electric parameters, such as current, voltage and
energy which
include volts, amps, Watts, phase relationships between waveforms, kWh, kvAr,
power
factor, and frequency, etc. The power quality monitoring component 264 reports
alarms, alerts, warnings and general power quality status, based on the
monitored
parameters, directly to the appropriate user, such as customers 132, 133 or
utilities 130,
131.
[0058] Figure 3a illustrates a preferred embodiment of an IED 302 for use with
the
disclosed power management architecture 100. The IED 302 is preferably coupled
with
a load 301 via a power a distribution system 300, or portion thereof. The IED
302
CA 02462212 2011-01-10
19
includes device circuitry 305 and a data communications interface 306. The IED
302 is
further coupled with a network 307. The device circuitry 305 includes the
internal
hardware and software of the device, such as the CPU 305a, memory 305c,
firmware
and software applications 305d, data measurement functions 305b and
communications
protocol stack 305e. The data communication interface 306 couples the device
circuitry
305 of the IED 302 with the communications network 307. Alternate embodiments
may
have power management control functions 305b in place of data measurement
circuitry.
For example, a relay may include a control device and corresponding control
functions
that regulate electricity flow to a load based on preset parameters.
Alternately a revenue
meter may include data measurement circuitry that logs and processes data from
a
connected load. IEDs may contain one or the other or combinations of
circuitry. In an
alternate embodiment the circuitry includes phasor monitoring circuits (not
shown)
which comprise phasor transducers that receive analog signals representative
of
parameters of electricity in a circuit over the power distribution system.
Further detail
and discussion regarding the phasor circuitry is discussed in U.S. Patent
Publication
20030101008A1.
[0059] Figure 3b illustrates a more detailed embodiment of the IED's 310 power
management application components 311 and protocol stacks. The IED 310
contains
power management circuitry 320 and also includes power management application
components 311, a communications protocol stack 312 and a data communications
interface 313 (as was noted above, in alternate embodiments, the protocol
stack 312
may include the data communications interface 313). The application components
311
includes a Load management component 315a, which measures the load's 317
consumption of electrical power from the portion of the power distribution
system 316,
a Power Quality component 315b, which measures power quality characteristics
of the
power on the portion of the power distribution system 316, and a
billing/revenue
management component 315c, which computes the quantity and associated value of
the
incoming power. The power management components are connected to the network
via
the data communications interface 313 using the communications protocol stack
312
(described in more detail below).
[0060] In one embodiment, a Billing/Revenue Management component on a back end
server receives the billing and revenue computations over the network 307 from
the
billing/revenue management component 315c on the IED 310. These computations
are
translated into billing and revenue tracking data of the load 317 associated
with the IED
CA 02462212 2011-01-10
310. The Billing/Revenue Management component on the back end server then
reports
the computations to the appropriate party operating that particular back end
server or
subscribing to a service provided by the operator the back end server, either
the
consumer or provider of the electrical power. Additionally, the
Billing/Revenue
5 Management component 315c on the IED 310 or the Billing/Revenue Management
component on the back end server computes usage and cost computations and
tracking
data of the associated load and reports the data to the appropriate party. In
a still another
embodiment, IED 310 transmits billing and revenue data directly to the
Billing/Revenue
Management component over the network 307 and the Billing/Revenue Management
10 component computes usage and cost computations and tracking data of the
associated
load and reports the data directly to the appropriate party. Furthermore,
tariff data
received from the utility by the Billing/Revenue Management component 315c is
factored into usage or cost computations.
[0061] Figure 3c illustrates a preferred embodiment of the communications
protocol
15 stack 305e. In the preferred embodiment the connection between devices
coupled with
the network 110 is established via the Transmission Control Protocol/Internet
Protocol
("TCP/IP") protocol suite. To facilitate communications over a network or
other
communications medium, devices typically include a set of software components
known as a protocol stack. The protocol stack handles all of the details
related to
20 communicating over a given network so that other application programs
executing on
the device need not be aware of these details. The protocol stack effectively
interfaces
one or more application programs executing on the device to the network to
which the
device is connected. Typically, the protocol stack is arranged as a layered
architecture
with one or more software components in each layer. In the preferred
embodiment, the
protocol stack includes an application layer 321, a transport layer 322, a
routing layer
323, a switching layer 324 and an interface layer 325. The application layer
321
includes all of the applications component software and/or power management
component software. The application layer 321 is coupled with the transport
layer 322.
Applications or software components in the application layer communicate with
the
transport layer in order to communicate over the network. In the preferred
embodiment,
the transport layer is implemented as the Transmission Control Protocol
("TCP"). The
transport layer, using TCP, divides communications from the applications of
the
application layer 321 into one or more packets for transmission across the
network. The
transport layer adds information about the packet sequence to each packet plus
source
CA 02462212 2011-01-10
21
and destination information about what application component generated the
communication and to what application component on the receiving end the
communication should be delivered to once reassembled from the constituent
packets.
The routing layer is coupled with the transport layer and is responsible for
routing each
packet over the network to its intended destination. In the preferred
embodiment, the
routing layer is implemented as the Internet Protocol ("IP") 326 and utilizes
internet
protocol addresses to properly route each packet of a given communication. The
switching and interface layers 324, 325 complete the protocol stack and
facilitate use of
the physical hardware which couples the device to the network. This hardware
may
include an Ethernet interface, a modem, or other form of physical network
connecting
including RF based connections such as Bluetooth interfaces. Generally, the
preferred
embodiments are capable of communicating via any network which transmits
information utilizing the TCP and IP, collectively TCP/IP, protocols as are
known in
the art. TCP/IP is essentially the basic communication language of the both
the Internet
and private intranets. TCP/IP utilizes the communications protocol stack and
can be
described as comprising a TCP layer which manages the decomposing and
reassembling of messages from the application layer 321 into smaller more
manageable
packets, and the IP layer which handles the addressing of the packets. The IP
layer
comprises the routing layer 323, the switching layer 324 and the interface
layer 325.
The interface layer 325, as described above, makes the physical connection
with the
network utilizing connections such as Ethernet, dial-up-modems, Point-to-Point
Protocol (PPP), Serial Line Interface Protocol (SLIP), cellular modems, T1,
Integrated
Service Digital Network (IDSN), Digital Subscriber Line (DSL), Bluetooth, RF,
fiber-
optics or AC power line communications. In an alternate embodiment multiple
interface
layers 325 are present. For example, the interface layer 325 contains both an
Ethernet
and cellular modem thus enabling the IED to connect to the network with either
interface. This redundancy is advantageous if one interface is inoperable due
to a local
Ethernet or cellular network outage. It is preferable that one or more of the
application
components in the application layer 321 implement TCP compatible protocols for
the
exchange of their communications over the network. Such TCP compatible
protocols
include the Instant Messaging protocol, file transfer protocol ("FTP"), or
Hypertext
Transport Protocol ("HTTP"). In addition, a Secure HTTP (S-HTTP) or Secure
Socket
Layers (SSL) may also be utilized between the application layer 321 and the
transport
layer 322 for secure transport of data when HTTP is utilized. S-HTTP is an
extension to
CA 02462212 2011-01-10
22
HTTP that allows the exchange of files with encryption and or digital
certificates. SSL
only allows authentication from the server where S-HTTP allows the client to
send a
certificate to authenticate to the user. The routing layer 323 and the
switching layer 324
enable the data packet to arrive at the address intended.
[00621 In operation the IED monitors the power distribution system for events
such as
wave shape deviation, sag, swell, kWh, kvA or other power usage, consumption,
or
power quality events and disturbances. In one embodiment, when the IED detects
an
event, it processes the event and generates an email message using an email
client
application component for transport over the network to a back end data
collection
server. Raw data 330, such as the error message generated from the IED or a
billing
signal, is passed into the application layer's 321 Security Sub-layer 321a
where it is
encrypted before email protocol packaging 321b takes place. Once the data 330
has
been encrypted and packaged, the message is passed through the remaining IP
layers
where the message is configured for transmission and sent to the destination
address. In
one embodiment, the destination address is for a back end server implementing
a data
collection application component. This back end server may be operated by the
consumer or supplier of electrical power or a third party as described above.
In an
alternate embodiment the Security Sub-layer 321a includes authentication or
encryption, or alternately the Security Sub-layer 321a is bypassed. The
application layer
may include application components which implement protocols that are designed
to
pass through a firewall or other type of software that protects a private
network coupled
with a publicly accessible network. Multiple redundant data messages may be
sent from
the IP layer to ensure the complete data packet is received at the
destination. In the
above operation, the protocol stack, which includes an SMTP or MIME enabled
email
client, is a scalable, commercial product such as the Eudora email client
manufactured by Qualcomm, Inc., located in San Diego, California. In an
alternate
embodiment data messages may also be sent to redundant destination email
addresses to
ensure delivery of the message. Quality of Service (QoS) may also be
implemented,
depending on the volume of bandwidth required for the data, ensuring reliable
and
timely delivery of the data. QoS is based on the concept that transmission
rates, error
rates, and other characteristics of a network can be measured, improved and,
to some
extent, guaranteed in advance. QoS is a concern for continuous transmission of
high-
bandwidth information. The power quality events, consumption, disturbances or
other
usage data may be stored in the IED and sent to the destination address upon
request
CA 02462212 2011-01-10
23
from an application component operating at the destination address, upon pre-
determined time intervals and schedules, upon pre-defined events or in real
time. In an
alternate embodiment an IED may transport data or requests to or receive data
or
requests from other IEDs directly, also know as peer-to-peer communications.
Peer-to-
peer is a communications model in which each party or device has the same
capabilities
and either party or device can initiate communication sessions.
[0063] In an alternate embodiment the Security Sub-layer 321a may include
multiple
encryption keys, each conferring different access rights to the device. This
enables
multiple users, such as a utility and customers, or multiple internal
departments of a
utility or customer, to send or receive data and commands to or from the IED.
For
example a customer's IED sends out two encrypted messages, one billing data
and one
power quality data, to the customer's office site. The billing data message is
encrypted
at a level where only the internal accounting department has access to decrypt
it. The
power quality data message is encrypted at a different level where the entire
company
can decrypt the message. Furthermore, in the preferred embodiment, commands
sent to
or from the IED are coupled with the appropriate encryption key. For example,
the
IED's Security Sub-layer 321a may only permit billing reset commands to be
received
and processed if the command has been authenticated where the point of origin
was the
appropriate customer or utility. Further, encrypted email messages may also
include
various encrypted portions, each accessible and readable with a different
encryption
key. For example an IED sends out one message to both the utility and the
customer
containing billing data and power quality data. The data is encrypted with two
different
encryption keys so only the utility can decrypt the power quality data and
only the
customer can decrypt the billing data.
[0064] In operation the IED monitors the power distribution system 300 for
billing
events such as, kWh or kvA pulses. In one embodiment the IED may store billing
events and transport the data to the power management application components
operating on a back end server either upon request or upon pre-determined time
intervals. Alternately the IED may transport billing event data in real time
to the back
end server. Data may be filtered through either the Back End Server's or IED's
power
management components or any combination or variation thereof, before being
entered
into the Billing/Revenue
Management component where billing, revenue, cost and usage tracking are
computed
into revised data. The Billing/Revenue Management components either stores the
CA 02462212 2011-01-10
24
computations for future retrieval or pushes the revised data to the
appropriate party,
such as the consumer or provider of the electric power system. Data can be
retrieved
upon command or sent or requested upon a scheduled time.
[00651 In the preferred embodiment the back end server's operate in a similar
approach to the IEDs. The back end server contains a transport protocol stack
and
power management application components. Alternatively, a back end server
could be a
function or component of the IED, i.e., implemented as an application
component.
[0066] The IED 402 implements power management functions on the whole
electrical
power distribution system 400 or just a portion thereof. Referring to Figure
4a the IED
402 monitors the electrical power via the system 400 to a load 401 and reports
events
and data to the power management application components 411 through the
network
410. The power management application components 411 are preferably operating
on a
back end server. The events and data are collected and processed through the
automated
meter reading components, billing/revenue management components or a
combination
and variation thereof, and revised data or commands are sent back to the IED
through
the network 410, enabling control of the power flow and distribution of the
loading on
the power distribution system. The automated meter reading component allows
for
retrieval and collection of data for the customer, utility or third party. The
component
further allows for schedule driven, event driven or polling commands which are
operable to push data onto the network.
[0067] The power management functions implemented by the IEDs enables the back
end servers or IEDs to control power flow and distribution over the electrical
power
distribution system. Specifically the power management application components
process power measurement data and generate power measurement and reporting
commands, transmitting them to the back end servers or IEDs for execution.
Referring
now to Figure 4b, in one preferred operation a load is monitored by an IED
where kvA
or kWh pulses 420 translated into data 422 are sent in real time over the
network 424 to
the Application via email or another transport protocol. If pre-processing is
required
425a the raw pulse data is transported into a data collection server or
component where
it is translated into a format readable by the billing/revenue management
component
426. Alternately, the billing/revenue management component may be configured
to
receive and process data without pre-processing 425b. Once sent to the
billing/revenue
management component 428 the data is compared and analyzed according to 430
for
usage, consumption or billing revenue ranges against a pre-determined tariff
structure
CA 02462212 2011-01-10
432 where any anomalies, excess or shortages are reported back to the IED in
the form
of a command to a power management function which controls the power flow and
load
distribution accordingly 434. The components further contact the required
parties, such
as the consumer or provider of the load, over the network, forwarding power
quality,
5 billing, usage or consumption reports or any power management functions that
were
required against the set tariff structure according to 436.
[00681 Figure 5a illustrates a preferred embodiment for a usage and
consumption
management application of the power management architecture. The IED 502
implements a power management function of controlling the source of electrical
power
10 for the load 501 from either energy supplier 1 (505) or energy supplier 2
(506). The
application is designed to take advantage a deregulated marketplace and
operate the
load 501 from the most cost efficient energy supplier at the given time
period. Which
supplier is most efficient may fluctuate frequently as a function of the
energy market
and supply and demand for electrical power. Referring to Figure 5b, the IED
502
15 contains a usage and consumption management component which receives tariff
and
cost structures from multiple energy suppliers 505, 506. The component
receives usage
and consumption from the Load 501 and compares actual usage against multiple
tariff
structures choosing the most cost effective provider for a given load.
Similarly the load
management component 259, as shown in Figure 2b, is utilized to connect and
20 disconnect loads to and from the electrical distribution system during
either low and
high rate and demand periods, hence reducing the electrical power costs and
demand. In
the preferred embodiment the load management component 259 is programmed to
run
in an automated fashion based on feedback from the system, however in an
alternate
embodiment the component is operated manually based on user input.
25 [00691 For example, an IED 502 is connected to a power line 500 and
associated load
501. The IED 502 measures power usage by the load, and by converting a kWa or
kVa
pulse 511 into data 512, transmits this consumption data 514 over a network
510 to a
usage and consumption management application component operating on a back end
server. The Usage and consumption management component receives and tracks
cost
and usage 516, 518 and upon receiving costs 520 of first and second energy
suppliers
505 and 506, compares rates for actual usage against multiple suppliers bids
522.
Suppliers have the option to either push tariff structures to the application
component or
have tariff structures polled over the network. Once the most cost effective
structure is
determined by the usage and consumption management component, a command or
CA 02462212 2011-01-10
26
function is sent to the IED 502 with the new tariff structure 523, 524.
Alternately, the
new tariff structure is applied across to the billing/revenue management
component
where billing is applied to the usage and revenue reports are forwarded onto
the
appropriate parties.
[0070] In another example the usage and consumption management component
determines all suppliers tariff structures are too expensive to warrant usage
or
consumption thus a command to reduce consumption (525) to a desired level is
transmitted over the network to the IED 502. Furthermore, an alternate
embodiment
includes application of real-time usage and cost monitoring of loads being
measured by
an IED and multiple energy and distribution system suppliers. The process then
completes at 530.
[0071] In an alternate embodiment the usage and consumption component is pre-
programmed to monitor and shed loads based on a exceeding a set tariff
structure. For
example an IED 502 monitors a load 501 connected to a power distribution
system 500.
Energy is supplied by an energy supplier 505. The IED contains a tariff
structure that
has a limit of $0.80/kWh during peak hours of 6am to 6pm and a limit of
$0.60/kWh for
non-peak hours of 6pm to 6am. The IED 502 monitors the power usage of the load
501
vs. the actual tariff structure of the energy supplier and shuts the load 501
off if the
actual tariff exceeds the limits of $0.80/kWh during peak times or $0.60/kWh
during
non-peak times.
[0072] The centralized power management component 255 allows the
centralization
of work at one location, such as a centralized billing server, load management
server or
master IED, which collects and processes data from various devices spread over
the
network. In operation, remote IEDs connected to the network transmit data to
the
centralized power management component where operations such as billing, load
management, usage and consumption reporting are processed in one central
location.
[0073] The distributed power management component 254 allows for the
distribution
of work or data processing to various devices on the network. In operation, an
IED
measures or detects an occurring or impending catastrophic power quality event
and
alerts other downstream IEDs (on the power distribution network) of the event
thereby
giving the downstream IEDs an opportunity to disconnect or alter loads before
the event
reaches the downstream system and causes damage. The component further
includes a
function that, upon detection of an occurring or impending event, alerts
downstream
IEDs or back end servers to alert their connected loads to either protect
themselves from
CA 02462212 2011-01-10
27
the outage by shutting down, or instructing them to shut down applications
that may
cause critical failure or damage if interrupted, such as writing to a hard-
drive. Figure 6
illustrates a preferred embodiment of the distributed power management
component in
action. An Electrical power distribution system 600 distributes energy over
distribution
lines 601 which are connected to multiple IEDs 620, 622, 624, 626 which are
present to
continuously monitor the energy being fed onto their respective loads 621, 623
and
generators 625, 627 on a given branch and furthermore all IEDs 620, 622, 624,
626 are
connected via a network 610 as described above. IEDs 616, 618 are also present
on the
distribution system 600 to continuously monitor energy being transferred onto
the
system as a whole. It will be appreciated that the loads and generators may
reside on
multiple or separate consumer sites. In operation, a catastrophic power
quality event is
detected on a load 623 by the attached IED 622. The IED 622 takes appropriate
action,
such as triggering a protection relay, on the load and further transmits
communications
of its actions to upstream IEDs 616, 618. This ensures local containment of
the event by
the IED 622 informing upstream IEDs to not duplicate the action on the larger
system.
Obviously retaining upstream IEDs as a backup is not discounted in this
operation.
Alternatively, the operation is utilized to coordinate downstream IEDs over
the network
610. For example an event may be detected at the distribution system 600 by an
IED
616 monitoring the system 600 which triggers, for example, a protection relay.
The IED
616 which triggered the protection relay communicates its actions to
downstream IEDs
618, 620, 622, 624, 626 over the network 610 allowing them to take appropriate
intelligent action, such as disconnection the generators 625, 627. It can be
appreciated
that IED applications may include a combination of the centralized and
distributed
power management components.
[0074] In one embodiment, a power reliability component 256 is provided in the
IED
to measure and compute the reliability of the power system. Power system
reliability is
discussed in commonly assigned U.S. Patent 6,671,654 issued December 30, 2003
entitled "APPARATUS AND METHOD FOR MEASURING AND REPORTING THE
RELIABILITY OF A POWER DISTRIBUTION SYSTEM". In the preferred
embodiment the component 256 computes and measures reliability as a number of
"nines" measure. The component includes a function which compiles the
reliability of
the power from other components located on back end servers or IEDs, giving a
total
reliability. This function also enables a user to determine which part of the
distribution
system has the most unreliable power. Knowing this enables the user to focus
on the
CA 02462212 2011-01-10
28
unreliable area, hopefully improving local power reliability and thus
increasing overall
reliability.
[0075] For example, referring now to Figure 7, an IED 711 is connected to a
network
710 and measures the reliability of the power distribution system 701 which
receives
power from power utility 700 and supplies power to loads 722, 724 within a
customer
site 705. The customer also provides a generator 726 which supplies power to
the loads
722, 724 at various times. The customer measures the power reliability of the
system
for the load 722, 724 using the associated IED 712, 714 and considers it
unreliable. One
IED's 714 power reliability component polls the other IED's 711, 712, 716 and
determines the unreliable power source is coming from the generator 726. From
this the
customer can decide to shut off the power supply from the generator 726 in
order to
improve the power reliability of the system.
[0076] In another embodiment, a power outage component 265 is provided in the
IED
which informs the appropriate parties of a power outage using email or other
transport
protocols. In the preferred embodiment an IED is connected to a power system
when a
power failure occurs. The IED's power outage component 265 contains hardware,
such
as a battery backup and modem, which enables the IED to transmit a power
failure
warning to the appropriate parties, such as the utility or customer, such as
by email over
a network as described above. Further, a cellular modem may be utilized to
call out to
indicate the location of an outage. Physical locating algorithms such as
cellular
triangulation or telephone caller ID can be used to track or verify outage
locations.
[0077] Peer to peer communications between IEDs and between back end servers
are
supported by the peer to peer management component 257. In the preferred
embodiment peer to peer communications are utilized to transport or compile
data from
multiple IEDs. For example, as shown in Figure 8, an IED 800 is connected to a
network 810. Multiple loads 806, 808 draw power from a power utility's 803
power
distribution line 801 and each load is monitored by an IED 802, 804. An IED
800 polls
load and billing data from all other IEDs on the network on the customer site
812. Upon
request, the IED 800 then transmits the load and billing data to the
customer's billing
server 814. In the preferred embodiment, the IED 800 communicates the load and
billing data in a format which allows software programs inside the customer
billing
server 814 to receive the data directly without translation or reformatting.
[0078] Transmission of data in XML format allows a user to receive the data in
a
readable self-describing format for the application intended. For example,
traditional
CA 02462212 2011-01-10
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data file formats include comma-separated value files (CSV), which contain
values in
tables as a series of ASCII text strings organized so each column value is
separated by a
comma from the next column's value. The problem with sending CSV file formats
is
the recipient may not be aware of each column's desired meaning. For example,
a CSV
file may contain the following information sent from a revenue billing
application
45.54,1.25,1234 Elm Street, 8500
[00791 where 45.54 is the kWh used this month, 1.25 is the kWh used today,
1234
Elm Street is the location of the device and 8500 is the type of device.
However, if the
recipient of the CSV file was not aware of the data format, the data could be
misinterpreted. A file transported in XML is transmitted in HTML tag type
format and
includes information that allows a user or computer to understand the data
contained
within the tags. XML allows for an unlimited number of tags to be defined,
hence
allowing the information to be self-describing instead of having to conform to
existing
tags. The same information is transmitted in XML format as:
<billing_information>
<kWh month>45.54</kWh month>
<kWh day>1.25</kWh day>
<location>1234 Elm Street</location>
<device type>8500</device type>
</billing information
[00801 Transmission in XML format allows the recipient to receive XML-tagged
data
from a sender and not require knowledge of how the sender's system operates or
data
formats are organized. In a preferred embodiment communications between IEDs
connected to the network are transmitted in XML format. An IED utilizes XML
based
client application components included within the power management
applications and
transmits the data in XML format so little or no post-processing is required.
Figure 9
illustrates an example of the preferred embodiment. An IED 902 is connected to
a
power distribution line 900 and connected via a line 905 to an associated load
901
owned by a customer 920. Power is supplied by a power utility's 908 power
generator
903. The power utility also has a utility billing server 906 which compiles
billing data
from consumers drawing power from their power generators. The IED 902 is
connected
to the utility billing server via a network connection 910 and the IED 902
measures
usage and consumption of the load, and other values associated with billing.
The utility
billing server 906 contains billing software, such as a MV90, which requires
data in a
CA 02462212 2011-01-10
specified format. Either upon request, or a prescheduled times, the IED 902
transmits
the usage, consumption and billing data associated with the load 901 to the
utility
billing server 906 in XML format. The customer also has a monitoring server
921
which is dedicated to receiving billing data from the IED 902 and reporting
usage and
5 consumption to the appropriate parties, the monitoring server 921 also reads
data in a
specified format for its associated monitoring software. The IED 902 transmits
the same
usage, consumption and billing data to the monitoring server 921 in XML
format. By
utilizing XML data formats the data transmitted by the IED 902 can be read by
multiple
servers or IEDs 902 that do not require knowledge beforehand of the order or
type of
10 data that is being sent. In an alternate embodiment an IED 902 may also
receive inputs
from peripheral devices which may be translated and combined in the XML
transmission. For example, the load 901 is a motor which contains a
temperature probe.
The temperature probe is connected to the IED 902 and allows the IED 902 to
monitor
the motor temperature in addition to power data on the power distribution line
900. The
15 IED 902 is programmed to act on the temperature input by shutting down the
motor if
the temperature exceeds a pre-defined critical level by tripping a relay or
other
protection device (not shown). The IED 902 is further programmed to alert the
customer monitoring server 921 and an alert pager 922 and if such an action
takes
place. This alert transmission is sent in XML format so both the server 921
and the
20 pager 922, which may be configured to read incoming transmissions
differently, receive
the alert transmission in the form it was intended. It can be appreciated that
the IED 902
can receive data in XML format from multiple sources without complete
knowledge of
their file transfer notations.
[0081] In an alternate embodiment the back end servers include software that
is
25 generally included on a majority of existing computer systems, such as
Microsoft
Office software, manufactured by Microsoft Corporation, located in Redmond,
Washington which includes the software applications Microsoft Word and
Microsoft
ExcelTM. The software receives data in a self describing format, such as XML,
and the
software includes off the shelf applications and processes such as a Microsoft
Exchange
30 Server, Microsoft Excel and associated Excel Workbooks, Microsoft Outlook
and
associated Outlook rules, Microsoft Visio and associated Visio Stencils,
Template files,
and macros which allow the user to view and manipulate data directly from the
IED. In
one embodiment the IED transmission format makes use of existing standard
software
packages and does not require additional low level components, such as a
CA 02462212 2011-01-10
31
communications server communicating with a serial port, which are normally
required
to interface to the IED communication ports. Further, the embodiment does not
require
a separate database, as the data is stored in the software programs. This
allows a user to
view data from the TED using standard computer software. For example,
referring now
to Figure 10, an IED 1002 monitors a load 1001 connected to a line 1000 and
passes the
monitored data to a monitoring server 1011 over network 1010. The data can be
transmitted using a variety of protocols, such as FTP, TCP/IP or HTTP, as
described
above. In the preferred embodiment data is transmitted in an HTTP based form
or an
SMTP form where the HTTP form is a self-describing format such as XML and the
SMTP format is an email message. The monitoring server 1011 includes Microsoft
Exchange Server 1022, Visio 1021, Microsoft Excel 1020 and Excel Workbooks
1023.
The Excel software 1020 is capable of receiving data directly from the IED in
a self-
describing format, thus allowing the user to view real time load profiles or
graphs and
other monitored data directly from the TED in real time. The Visio software
1021 is also
capable of receiving data directly from the IED in a self-describing format,
thus
allowing the user to process and view real time data in Visio format.
Alternately, the
IED transmits power quality, load, billing data or other measured or monitored
values
to the Excel Workbooks 1023 via the Exchange Server 1022. The Excel or Visio
software is then capable of retrieving historical data directly from the
workbooks.
[0082] Referring to Figure 11, there is shown an exemplary screen display of a
Microsoft Excel worksheet which is coupled with the IED 1002 as described
above. In
this example, the IED 1002 is a model 8500 meter, manufactured by Power
Measurement Limited, in Victoria, British Columbia, Canada. The IED 1002 is
coupled
via a TCP/IP based network with a personal computer having at least 64 MB
memory
and 6 GB hard disk with a Pentium TM III or equivalent processor or better,
executing
the Microsoft Windows 98TM operating system and Microsoft Excel 2000. The
computer further includes Microsoft Internet ExplorerTM 5.0 which includes an
XML
parser that receives and parses the XML data from the meter and delivers it to
the Excel
worksheet. The worksheet displays real time data received directly from the
IED 1002
in an XML format. As the IED 1002 detects and measures fluctuations in the
delivered
electrical power, it transmits updated information, via XML, to the worksheet
which, in
turn, updates the displayed data in real time. Note that all of the features
of the
Microsoft Excel program are available to manipulate and analyze the received
real time
data, including the ability to specify mathematical formulas and complex
equations
CA 02462212 2011-01-10
32
which act on the data. Further, display templates and charting/graphing
functions can be
implemented to provide meaningful visual analysis of the data as it is
received. Further,
the real time data can be logged for historical analysis. In one embodiment,
the
activation of a new IED 1002 on the network is detected by the worksheet which
cause
automatic generation of a new worksheet to receive and display data from the
new
device.
[0083] As described above, a generally accessible connectionless/scalable
communications architecture is provided for operating power management
applications.
The architecture facilitates lED-supplier communications applications such as
for
automated meter reading, revenue collection, IED tampering and fraud
detection, power
quality monitoring, load or generation control, tariff updating or power
reliability
monitoring. The architecture also supports IED-consumer applications such as
usage/cost monitoring, IED tampering and fraud detection, power quality
monitoring,
power reliability monitoring or control applications such as load
shedding/cost control
or generation control. In addition, real time deregulated utility/supplier
switching
applications which respond in real time to energy costs fluctuations can be
implemented
which automatically switch suppliers based on real time cost. Further the
architecture
supports communications between IEDs such as early warning systems which warn
downstream IEDs of impending power quality events. The architecture also
supports
utility/supplier to customer applications such as real time pricing reporting,
billing
reporting, power quality or power reliability reporting. Customer to customer
applications may also be supported wherein customers can share power quality
or
power reliability data.
[0084] As described above, alternative embodiments are contemplated herein
which
relate to Energy Management ("EM") Components that employ various techniques
and
use various services to enable them to communicate in a secure, safe fashion
with one
another. These disclosed embodiments relate to EM Networks and EM Systems that
employ various means to manage security within the network and the system, as
were
described above.
[0085] Energy Management ("EM") data includes, but is not limited to,
Electrical
Operation Data such as volts, amps, status, power; Power Quality Data such as
harmonics, power factor, reliability (such as number of nines), disturbance
data;
Consumption Data such as energy and demand; Event Data such as set point
actions,
status changes and error messages; Financial Data such as energy cost, power
factor
CA 02462212 2011-01-10
33
penalties, revenue data; billing data such as tariffs for gas, water, steam
and air;
Environmental Data such as temperature, pressure, humidity, pollution, and
lightning /
atmospheric disturbance data; Water Air Gas Electric Steam ("WAGES") data;
Configuration data such as frameworks, firmware, software, calculations
involving EM
Data and commands; and aggregated data, where at least one energy management
datum is combined with other data points. For the purposes of this
application,
combined data includes measured data, aggregated data and/or computed data.
[0086] An EM component is an entity that creates, consumes or routes EM data.
These components include but are not limited to: Intelligent Electronic
Devices
("IEDs") (also known as EM Devices), analog sensors, digital sensors as
described in
U.S. Patent No. 6,236,949, gateways, and computers.
[0087] As was described above, IEDs include revenue electric watt-hour meters,
protection relays, programmable logic controllers, remote terminal units
("RTUs"),
fault recorders, other devices used to monitor and/or control electrical power
distribution and consumption, RTUs that measure water data, RTUs that measure
air
data, RTUs that measure gas data, and RTUs that measure steam data. IEDs are
widely
available that make use of memory and microprocessors to provide increased
versatility
and additional functionality. Such functionality includes the ability to
communicate
with other hosts and remote computing systems through some form of
communication
channel. IEDs also include legacy mechanical or electromechanical devices that
have
been retrofitted with appropriate hardware and/or software allowing
integration with the
power management system. Typically an IED is associated with a particular load
or set
of loads that are drawing electrical power from the power distribution system.
The IED
may also be capable of receiving data from or controlling its associated load.
Depending on the type of IED and the type of load it may be associated with,
the IED
implements a function that is able to respond to a command and/or generate
data.
Functions include measuring power consumption, controlling power distribution
such
as a relay function, monitoring power quality, measuring power parameters such
as
phasor components, voltage or current, controlling power generation
facilities,
computing revenue, controlling electrical power flow and load shedding, or
combinations thereof. For functions that produce data or other results, the
IED can push
the data onto the network to another IED or back end server/database,
automatically or
event driven, or the IED can send data in response to an unsolicited request.
IEDs
capable of running Internet protocols may be known as "web meters". For
example, a
CA 02462212 2011-01-10
34
web meter may contain a web server.
[0088] For the purposes of the disclosed embodiments, a computer is defined as
a
device that comprises a processing unit and includes, but is not limited to,
personal
computers, terminals, network appliances, Personal Digital Assistants
("PDAs"), wired
and wireless devices, tablet personal computers, mainframes, as well as
combinations
thereof.
[0089] A framework is a set of interconnected functions that are uploadable to
a
device and that affect the behavior of the device. A framework can be produced
from
scripting languages like PERL, VBScript and XSLT, predicate logic like Prolog,
fuzzy
logic and functional programming, spreadsheets like Visicalc and Excel, user
interface
definitions such as XSLT and XFORMS, and downloadable software that is
interpreted,
just-in-time compiled or compiled. Alternately, frameworks may be created and
manipulated by connecting multiple integrated object network ("ION ") modules
together. ION defines the way information, specifically power monitoring
information, is accessed, transferred and manipulated inside an EM Device. The
functionality and data manipulation of the EM Device can be accomplished by
one or
several frameworks stored in the IED software. A complete list of ION modules
is
contained in the "ION Reference Manual", printed by Power Measurement Ltd.,
located in Saanichton, B.C., Canada.
[0090] One or more EM components are coupled together in any configuration to
form EM networks. As discussed above, herein, the phrase "coupled with" is
defined to
mean directly connected to or indirectly connected through one or more
intermediate
components. Such intermediate components may include both hardware and
software
based components.
[0091] EM systems are formed from coupling one or more EM Networks. When there
is more than one EM network within the system, the networks can be linked in
any
functional way. Not all networks within a system are directly coupled with one
another,
and EM networks may be coupled with one another via a third EM network. Non-EM
networks may also couple EM networks with one another.
[0092] These EM networks or EM systems may represent many entities, including
Device Manufacturers, Utilities, Power Consumers, End Users, National Accounts
Customers, Load Serving Entities ("LSEs"), Application Service Providers
("ASPs").
Independent Service Operators ("ISOs"), Non Affiliated Entities ("NAEs"),
customer
sites running device configuration utilities, Meter Shops, and Third Party
Data Sources
CA 02462212 2011-01-10
providing energy related data such as weather, tariffs and so forth.
[0093] LSEs are entities authorized to supply energy to retail customers.
[0094] ASPs are typically entities that supply software application and / or
software
related services over the Internet.
5 [0095] ISOs are entities that were formed to dole out electricity to the
grid after
deregulation.
[0096] NAEs are groups of entities that may share some information with each
other
but are not closely tied. For example, utilities, energy marketers, ISOs and
other entities
all need to exchange EM data with one another as part of their business, but
don't
10 necessarily trust each other or share the same private network.
[0097] An exemplary device configuration utility is ION Designer,
manufactured
by Power Measurement Ltd, of Saanichton, B.C. Canada.
[0098] Meter Shops are plants or industrial units where IEDs are configured.
[0099] Some EM components may host Energy Management Software ("EM
15 Software") systems that allow users to manage associated EM components,
networks
and/or systems. An exemplary EM Software package is ION Enterprise,
manufactured by Power Measurement Ltd, of Saanichton, B.C. Canada. For the
purposes of this application, a user is considered to be either a person or a
component
that interacts with, extracts data and provides commands and data to an EM
component,
20 EM network, or EM system.
[00100] EM components within the same network communicate with one another via
channels. Components in different networks communicate with one another as
well,
possibly using different channels. A channel is essentially the infrastructure
used to
move data from one place to another, and can include public or third-party
operated
25 networks such as: Virtual Private Networks ("VPNs"), Local Area Networks
("LANs"),
Wide Area Networks ("WANs"), telephone, dedicated phone lines (such as ISDN or
DSL), Internet, Ethernet, paging networks, leased line; Wireless including
radio, light-
based or sound-based; Power Line Carrier schemes; spatial movement of data
using
Newtonian means including data stored in some format such as printed,
magnetic,
30 optical, flash memory, RAM, on a computer, Personal Digital Assistant
("PDA"),
Hand-Held Format ("HHF") reader or other device, and transported by couriers,
postal
services or Meter Readers driving around in trucks.
[00101] VPNs connect disjoint parts of the same network. They also allow
authenticated users to communicate securely over the Internet with a protected
or
CA 02462212 2011-01-10
36
private network. VPNs work by allowing client devices to securely communicate
with a
VPN concentrator or server. The client or concentrator may be embedded in
another
device such as a firewall or a router. This is particularly valuable when
users are
separated by geographic distance that otherwise limits their access to the
protected or
private network.
[00102] Power Line Carrier describes a family of networking technologies that
enable
computer and voice networking over existing electrical wiring.
[00103] Various protocols used in the system include but are not limited to:
TCP/IP, Bluetooth, Ethernet, IEEE 802.11a, IEEE 802.11b and IEEE 802.11g,
HTTP,
SMTP, NNTP, POP, IMAP, IPSec, Trivial File Transfer Protocol ("TFTP"), Blocks
Extensible Exchange Protocol ("BEEP"), Zigbee, MIME, SNMP, SOAP, and XML-
RPC.
[00104] Many different data formats that may be used to exchange data,
including but
not limited to: binary, XML, XHTML and XHTML Basic, XHTML Basic as an Infoset
in another form besides tagged text, Binary encoded equivalents of XML
Infosets
including Wireless Binary XML ("WBXML"), ASN.1 encoded XML, SVG, Direct
Internet Message Encapsulation ("DIME"), CSV, XML RPC, SOAP (with signature at
SOAP level and/or enclosed content level), SOAP (using WS-SECURITY with
signature at SOAP level and/or enclosed content level), application specific
content like
spreadsheet data, an HTTP response to an unsolicited HTTP request, a response
to an
unsolicited message, HHF, PQDIF, MODBUS, ION , or other SCADA protocol where
a response can be packaged up and embedded in another protocol or format.
These
formats are frequently sent as MIME or UUENCODE attachments and are considered
part of the protocol stack.
[00105] Most channels between components in an EM System are insecure channels
subject to security attacks including malicious acts such as forgery, denial
of service,
invasion of privacy and so forth. Messages passed over insecure channels are
subject to
interception, tampering and fraud. Successful malicious acts may result in
unintentional
security breaches such as faults, power outages, financial losses, exposure of
sensitive
data, turning off or on equipment that other parts of system rely on,
depriving use of the
system, and so forth. Legitimate users may also unintentionally perform some
action
that compromises the security of the system.
[00106] As EM systems expand and incorporate public networks, particularly the
Internet, wireless networks and telephone systems, the need for secure
transfer of data
CA 02462212 2011-01-10
37
becomes crucial. It is hereby the purpose of the disclosed embodiments to
provide
robust security to an EM Network or to an EM Device on a network.
[00107] There are many EM Systems and activities that require security due to
economic impact caused by an antagonist preventing a valid action from taking
place or
initiating an undesired change in the electrical system. One application is EM
Systems
where EM Components are able to curtail loads or startup generators in
response to an
authorized command. Such a command may come from an energy analytics system or
standard SCADA system that issues the command based on an economic analysis or
an
LSE with which the energy consumer has a curtailment agreement. EM Devices
provide data indicating how much load has been curtailed, the current load,
the current
rate of greenhouse gas emissions, etc, to other applications in the system.
These
applications may be real-time energy analytics applications that make
decisions based
on the economics of curtailing loads or firing up generators or applications
run by an
LSE. In some systems, a message may be broadcast to thousands of loads via
USENET,
wireless, email, HTTP Rendezvous, Smart Personal Object Technology ("SPOT")
etc.
[00108] HTTP Rendezvous is described in US Patent Publication US2001000814436.
[00109] SPOT is a technology that uses the FM band and is coupled with a new
digital
radio infrastructure. Utility rates tables, firmware upgrades, time syncs and
other
unidirectional communications can be transmitted inexpensively to EM
Components
using SPOT.
[00110] Other applications include securely exchanging data across an
enterprise or
across insecure channels and perimeters to service companies who provide
energy
analytics services, billing and department sub-billing services, bill
verification services,
PQ Event analysis and classification, academic research into energy economics,
or
exchange of data with building management systems (i.e. to control thermostat
limitations based on economic information determined by EM systems, or ERP
systems
for production planning, etc.)
[00111] Another application is where some information is sent to the consumer
of
energy for them to manage their usage, and some information is sent to the
supplier to
do billing.
SECURITY MECHANISMS
[00112] There are various techniques, including encryption, authentication,
integrity
and non-repudiation that provide secure communications. Encryption provides
privacy
by preventing anyone but the intended recipient(s) of a message from reading
it.
CA 02462212 2011-01-10
38
Authentication ensures that a message comes from the person from whom it
purports to
have come from. Integrity ensures that a message was not altered in transit.
Non-
repudiation prevents the sender from denying that they sent a message.
[00113] Various mechanisms can be used to secure parts of the system and the
transmission process. Their particular applications to EM systems will be
described in
detail later.
[00114] With Public Key Encryption, each user has a pair of keys, a public
encryption
key, and a private decryption key. A second user can send the first user a
protected
message by encrypting the message using the first user's public encryption
key. The
first user then decrypts the message using their private decryption key. The
two keys
are different, and it is not possible to calculate the private key from the
public key. In
most applications, the message is encrypted with a randomly generated session
key, the
random key is encrypted with the public key and the encrypted message and
encrypted
key are sent to the recipient. The recipient uses their private key to decrypt
the session
key, and the newly decrypted session key to decrypt the message.
[00115] Digital signatures are provided by key pairs as well, and provide
authentication, integrity and non-repudiation. In this case a sender signs a
one-way hash
of a message before sending it, and the recipient uses the senders public key
to decrypt
the message and verify the signature. When signing large documents it is known
to take
a one way hash function of the plain text of the document and then sign the
hash. This
eliminates the need to sign the entire document. In some cases, the digital
signature is
generated by encrypting the hash with the private key such that it can be
decrypted
using the signers public key. These public/private key pairs and associated
certificate
key pairs may be computed using hard to reverse functions including prime
number and
elliptic curve techniques.
[00116] One-way Hash Functions are small pieces of data that identify larger
pieces of
data and provide authentication and integrity. Ideal hash functions cannot be
reversed
engineered by analyzing hashed values, hence the `one-way' moniker. An example
of a
one-way hash function is the Secure Hash Algorithm.
[00117] X.509 and PGP each define standards for digital certificate and public
key
formats.
[00118] Various encryption algorithms such as RSA, Advanced Encryption
Standard ("AES"), DES and Triple DES exist. RSA is a commonly used encryption
and
authentication system for Internet communications.
CA 02462212 2011-01-10
39
[00119] Secure Sockets Layer ("SSL") creates a secure connection between two
communicating applications. For the purposes of the disclosed embodiments, SSL
and
Transport Layer Security ("TLS") are equivalent. These protocols are employed
by web
browsers and web servers in conjunction with HTTP to perform cryptographically
secure web transactions. A web resource retrievable with HTTP over TLS is
usually
represented by the protocol identifier "https" in the URI. TLS can and is used
by a
variety of Application protocols.
[00120] Secure HTTP (S-HTTP) provides independently applicable security
services
for transaction confidentiality, authenticity, integrity and non-repudiability
of origin.
[00121] S/MIME and Pretty Good Privacy ("PGP") provide encryption and
authentication for email and other messages, allowing users to encrypt a
message to
anyone who has a public key. Furthermore, a message can be signed with a
digital
signature using a private key. This prevents users from reading messages not
addressed
to them and from forging messages to appear as though it came from someone
else.
[00122] Kerberos is a secure method for authenticating a request for a service
on a
computer network that does not require passing the user's password through the
network.
[00123] Microsoft Passport is an online service that allows a user to employ
their email
address and a single password to create a unique identity. Microsoft Passport
is
manufactured by Microsoft Corporation of Redmond, Washington, USA.
[00124] Liberty Alliance Project is an alliance formed to deliver and support
a
federated network identity solution for the Internet that enables single sign-
on for
consumers as well as business users in an open, federated way.
[00125] Internet Protocol Security ("IPSec") secures IP traffic across the
Internet, and
is particularly useful for implementing VPNs, Point-to-Point Tunneling
Protocol
("PPTP") is a protocol that allows entities to extend their local network
through private
"tunnels" over the Internet. This kind of connection is known as a VPN. Layer
Two
Tunneling Protocol ("L2TP) is an extension of the PPTP protocol.
[00126] The XML Signature syntax associates a cryptographic signature value
with
Web resources using XML markup. XML signature also provides for the signing of
XML data, whether that data is a fragment of the document which also holds the
signature itself or a separate document, and whether the document is logically
the same
but physically different. This is important because the logically same XML
fragment
can be embodied differently. Different embodiments of logically equivalent XML
CA 02462212 2011-01-10
fragments can be authenticated by converting to a common embodiment of the
fragment
before performing cryptographic functions.
[00127] XML Encryption provides a process for encrypting/decrypting digital
content,
including XML documents and portions thereof, and an XML syntax used to
represent
5 the encrypted content and information that enables an intended recipient to
decrypt it.
[00128] Web Services Security ("WS-Security") is a proposed IT standard that
addresses security when data is exchanged as part of a Web Service. WS-
Security
specifies enhancements to SOAP messaging aimed at protecting the integrity and
confidentiality of a message and authenticating the sender. It also specifies
how to
10 associate a security token with a message, without specifying what kind of
token is to
be used. It is designed to be extensible with future new security mechanisms.
[00129] A Media Access Control Address ("MAC Address") is a number that is
appended to a digital message and provides authentication and integrity for
the
message.
SECURITY SERVICES
[00130] Referring now to FIG. 12 various trusted Security Services 1400 exist
to
allow entities, systems or devices to communicate securely with one another
and to
provide access control to data and / or resources. These Security Services
1400 include
such services as Witnessing Services 1405, Identification and Verification
Services
1410, Certificate Authorities 1415, Certificate Revocation Services, Name
Registries,
Key Servers and Single Sign-On ("SSO") services such as Kerberos, Microsoft
Passport
and Liberty Alliance. These Security Services authenticate identity, validate
and verify
data integrity, provide non-repudiation, ensure contract signing, ensure
signing of data
by several parties where a signature is valid if and only if all parties sign
the data.
[00131] Key Servers allow for public key and certificate exchange between
various
EM Components. The public key or certificate is published to a Key Server
service or
by the owner. The Key Server provides some sign-on mechanism. The Key Server
can
also provide certificate generation, key generation, installation
certificates, revocation
lists and Lightweight Directory Access Protocol ("LDAP"), or these functions
can be
provided by another security service. Certificate revocation lists are
frequently exposed
via LDAP and certificates can be revoked by EM devices in a secure fashion to
prevent
antagonists from revoking other's certificates. These revocation means include
SOAP,
HTTP, email, etc.
CA 02462212 2011-01-10
41
[00132] Devices can exchange their public information including identity and
public
keys with any entity they choose. It is often useful for a device to export a
PKI
certificate and/or public key so that recipients can use them for security
operations later.
Sometimes, the certificate or public key is sent in every message to simplify
processing
by the recipient.
[00133] It will be appreciated that although Security Services 1405 - 1415 are
depicted
bundled together under the general Security Services 1400 umbrella, that these
Security
Services 1405 - 1415 may be provided by one or more different organizations,
and that
Security Services 1405 - 1415 are shown bundled together for simplicity.
Security
Services 1405 - 1415 can be provided by EM Device or EM Software
manufacturers,
device or software owners, or by Trusted Third Parties ("TTPs").
[00134] EM Component 1420 contains a Security Module 1425, and EM Component
1430 contains a Security Module 1435. Security Modules 1425, 1435 provide
similar
functionality as the Security Module described in the aforementioned co-
pending
application. It is desirable for EM Components 1420, 1430 to communicate
securely
with one another. However, Security Modules 1425, 1435 require certain
witnessing,
identification, certification revocation lists, verification and
authentication services.
Therefore, EM Components 1425, 1435 are configured to use Security Services
1400
when communicating with one another. Alternately, EM Components 1420, 1430 use
security services to implement system level security functions during
communications
or message processing. For example, EM Component 1420 may implement a security
service to verify data sources from a system of devices.
[00135] Alternately, Security Module 1425 is directly programmed with security
data.
For example, Security Module 1425 is programmed or supplied with the public
key or
PKI certificate of EM Component 1430 and thereafter trusts that data signed by
EM
Component 1430 is in fact sourced by EM Component 1430. Such a relationship
may
be necessary if EM Component 1420 is unable to access Security Services 1400.
Alternately, if Security Module 1425 is in possession of the PKI certificates
of trusted
CAs and trusts that those certificates are accurate, when it receives a
certificate from
EM Component 1430, it can use PKI techniques to see if that certificate is
warranted by
a trusted CA to be for EM Component 1430, and if the certificate is warranted,
it can
use the technique described above to decide when to trust data apparently from
EM
Component 1430.
[00136] Security Module 1425 is linked via channel 1450 with Security Services
CA 02462212 2011-01-10
42
1400, and via channel 1455 with Security Module 1435. Security Module 1435 is
linked via channel 1451 with Security Services 1400. It will be appreciated
that
channels 1450, 1451, 1455 may be encompassed in the same network, and that the
channels may be direct links, or may incorporate several intermediate servers,
routers,
firewalls, application gateways, protocol gateways, physical delivery
mechanisms, and
so forth that are presently omitted for clarity. It will be appreciated that
entities
exchanging data may comprise communication endpoints and/or loosely coupled
applications that are not aware of the communications infrastructure.
IDENTIFYING EM COMPONENTS
[00137] Before EM Components can communicate securely with one another they
need to be provided with identities. The identity must not be easy to assume
either
intentionally or accidentally. Identities for EM Components also provide a
guarantee or
an assurance that EM data comes from a given source EM Component and has not
been
tampered with or corrupted.
[00138] Identities are particularly relevant in multi-site scenarios, where EM
data is
aggregated across a wide geographic area containing multiple sites, serviced
by
multiple utilities, each site operating on one or more utility rates. Each EM
component
in the system needs to identify itself, particularly when reports are run
across multiple
databases or against aggregated data, or when the EM data has financial
implications. In
this case, before data from an EM component is inserted into a central storage
location
the EM component will be identified and a check will be made to see if its
data is
already in the central storage and if so it will not be inserted again.
Furthermore, in
order to take advantage of third party services, EM components need a way to
identify
themselves to Web services or the world in general in a standard and easy way.
Identity
can be used both to authenticate a user and also to provide access control to
resources.
[00139] This identity can be implemented using various values, including MAC
address, Universal Unique Identifier ("UUID"), TCP/IP address, DNS name, email
address, serial number, a unique string of characters issued by an authority,
such as a
URI, a device type, a name or an identifier of one or more authorities.
[00140] A UUID is a 128-bit number or a representation thereof that can be
used to
identify components. The possibility of duplicate UUIDs being generated by the
well-
known UUID algorithms is so remote that UUIDs are considered unique.
[00141] An SSO service such as Microsoft Passport, Liberty Alliance,
Kerberos,
CA 02462212 2011-01-10
43
XML Web Service, or a manufacturer hosted identity server can be used to
assign
identity. Microsoft Passport uses email addresses to identify users,
including EM
devices. XML Web services implement signatures and encrypted data using XML
Signing and XML Encryption. Most of these systems do not require the
disclosure of a
password by the EM device. Communications with them can be made secure by
using
any one of TLS, SSL, IPSec, VPN, or other communication endpoint protocols
that
have security built in. Once the identity is assigned, the EM component can
access other
resources to which it is authorized, send or receive verifiable data to or
from other
devices, and may provide access to other entities of its own resources. The EM
Component can use a SSO or public key to be assigned new keys and certificates
or to
publish new public keys and certificates it has assigned itself.
1001421 When email addresses or URIs that are URLs are used to identify EM
Component 1420, EM Component 1420 has the ability to receive messages at the
corresponding email address or URI and respond to the sender. This provides a
basic
way to deliver or retrieve secrets from EM Component 1420. This basic security
arises
from the fact that it is somewhat difficult to intercept messages to named
devices within
a short timeframe.
ASSIGNING THE IDENTITY
[00143] It is imperative that no EM components have the same identity, so when
two
or more entities or authorities are assigning identifiers to EM Components, it
is possible
that the same identity will be assigned to different EM Components. It is
therefore
preferred that the entity or authority name be a significant portion of the
identity. A
process of inserting an identity in all EM Components at manufacturing or
repair time
provides a useful identity for further use by parties involved in exchanging
EM data in a
secure fashion.
[00144] To protect its identity, EM Component 1420 should store the identity
in a
location that cannot be easily accessed or replaced. A poor place to locate
the identity
would be on a card that can be moved from one component to another, such as an
Ethernet card. In one embodiment, the identity is located in the EM Component
1420
firmware, protected by a mechanism that detects corruption or tampering of the
device
identity. In a second embodiment, the identity is stored in a dedicated,
secure area of
memory. Security Module 1425 manages the integrity of the identity.
[001451 In one embodiment, EM Component 1420 is assigned two pairs of one
private
key and one digital certificate each during manufacturing. The certificates
are signed by
CA 02462212 2011-01-10
44
the manufacturer and contain various items necessary for PKI infrastructure
including
the device identity. The first key / certificate pair is a signing private key
(the device
identity signing key), and verification certificate (the device identity
verification
certificate), which are used to sign and verify EM Component 1420 data. The
second
key / certificate pair is a decryption private key (the device identity
decryption key) and
an encryption certificate (the device identity encryption certificate), used
for encryption
and decrypting EM data published by EM Component 1420. In one embodiment, the
same key pairs and certificate are used for signing and decryption.
Alternately the two
keys are stored only on EM Component 1420. The two certificates are stored on
EM
Component 1420 and also on a mission critical server provided by the EM device
manufacturer as Security Service 1400. If EM Component 1420 fails or is
stolen, the
certificates can be revoked through interaction with the Security Service
1400. Any
signed data from EM Component 1420 can be verified by checking the signature
against the document and the certificate against the certificate authority
provided by the
manufacturer. Now EM data published by EM Component 1420 can be verified
separately from the message and protocol transporting the EM data.
[00146] PKI certificate based authentication schemes are better for machine-to-
machine authentication. In this case, EM Component 1420 is issued one or more
PKI
certificates, associated identities and identity-related secrets, such as
private keys,
during manufacturing. This eliminates the need for EM Component 1420 to use an
authentication service such as Kerberos. EM Component 1420 need never send a
password or other identity-related secret. This provides for a more efficient
implementation on EM Component 1420 and a simpler overall system, as EM
Component 1420 does not need to interact with Security Service 1400 during
operation.
Instead, EM Component 1420 signs data using its private key.
[00147] Alternately, an identity and certificate are assigned by an authority
unrelated
to the device manufacturer and transferred to EM Component 1420 in a manner
that
keeps all secrets private. This can be accomplished by using a secure
protocol, a
network on which antagonistic traffic will not be present, or by installing
physical
hardware on EM Component 1420 that already has a certificate and identity
related
secret on it. Multiple device identity and/or certificates can be assigned to
EM
Component 1420 by one or more authorities.
[00148] In the above embodiments the identity related secrets are assigned to
the
device. In an alternative embodiment, EM Component 1420 generates its own key
pairs
CA 02462212 2011-01-10
with an algorithm and provides the public key to an authority. The authority
generates a
PKI certificate that it provides to EM Component 1420.
DEVICE IDENTITY VERSUS METERING POINT IDENTITY
[00149] Where EM Component 1420 is an EM Device or EM Gateway, there is often
a
5 need to distinguish between the identity of the device and the identity of
the metering
point that device is measuring. The device identity could be the serial
number, serial
number/device type combination, MAC address or UUID assigned to the device,
whereas metering point identity relates to the physical location where the
device is
installed or the specific purpose of the device. A consumer of data from the
device
10 wants to be sure that the data they are receiving purportedly from that
device is in fact
from that device (guaranteed by device identity) and also from the physical
location
(guaranteed by metering point identity) the device was installed at. It will
be
appreciated that in some cases a single EM device may be metering multiple
points. In
the case where there are multiple users of the EM data, every user needs to
trust that the
15 data they are receiving is reliable, and has not been tampered with by
another user. For
example, it would be fairly easy for the antagonist to commit fraud or other
forms of
havoc, including financial or even grid operational by using a rogue device.
[00150] This problem can be solved by issuing EM Component 1420 two identities
and associated security password or key pairs/certificates, usually issued by
two
20 different authorities, one for device identity and one for metering
identity. Each
authority is a CA or SSO, and must be trusted by all users of data from the
device. The
authority for the metering point ensures that there is only one device with an
identity for
a particular metering point. This provides a mechanism for the authority to
guarantee to
their users which devices are associated with specific metering points and for
users to
25 verify data coming from a device is in fact from that device. To verify the
data is from a
particular device and a metering point, the data must be verified using both
security
systems. EM Component 1420 provides an interface that allows it to be assigned
a
password and/or key pairs and certificates and metering point identification.
In one
instance, both systems are PKI and the device signs the data with two
different private
30 keys, one from each PKI. A recipient uses both signatures to verify that
the device and
not a rogue antagonist sent the data, and that the device is associated with
the correct
metering point.
[00151] In an alternate embodiment, a seal is applied when EM Component 1420
is
installed at the metering point. This seal guarantees that the device has not
been moved
CA 02462212 2011-01-10
46
from that point. This seal can be as simple as a switch that is automatically
opened
when the device is removed from a socket. Once the switch is opened, the seal
is
broken. If it is moved for any reason, either unintentionally or maliciously,
the seal is
broken, and the Security Module 1425 revokes access to the metering point from
the
authority. The metering point identity can be either disabled or erased.
[001521 In an alternate embodiment device removal can be detected through an
embedded global positioning system ("GPS") installed in the device.
Furthermore, as
device downtimes and outages in various areas are usually known, device
downtime
can be correlated with known power outages in that area. The comparison could
happen
at the authority or on the device depending on who sends outage/downtime data
to
whom.
IDENTITY NAME REGISTRY
[001531 A name registry maintains a database of device identities, associated
EM
devices, and the times at which they entered and left service at a specific
metering
location. For example, EM Component 1420 is assigned an identity, and
recipients of
EM Component 1420 data, such as EM Component 1430, can easily verify the
source
of the data, and that the certificate is a currently valid certificate issued
by the EM
Component 1420 manufacturer, by using PKI techniques. EM Component 1430 maps
the EM Component 1420 URI to the Metering Point URI either by using a secure
service, typically an XML Web Service, provided by the registry owner as a
Security
Service 1400, or by using a local copy of the registry it has previously
retrieved. Where
an EM device vendor does not provide or comply with a known URI scheme, the
owner
of the name registry could define a URI scheme for the vendors' equipment, as
long as
the EM device has a set of identifying attributes such as MAC address or
serial number.
The registry must be updated whenever an EM device is brought into or removed
from
service. The registry may be implemented as a distributed registry with a host
name
encoded within the Metering Point URI corresponding to a registry for that
particular
host. Alternatively, the registry can be implemented as a single large
database. The
registry can be implemented as a relational database, XML files, Comma
Separated
Value ("CSV") files, or Resource Description Files ("RDF"), or any mechanism
that
allows associated lookup when combined with the appropriate software. The
registry
enforces uniqueness of metering point URIs, thereby preventing two devices
from
having the same URI at the same instant. In the case of the distributed
registry, a
registry server would be placed on the host. The best way to update the
registry is using
CA 02462212 2011-01-10
47
web services that employ some form of security typically used with web
services, like
Kerberos or a PKI scheme employing PGP or x.509 certificates. Various
techniques can
be applied to ensure that the registry remains up to date, including requiring
device
owners to update the registry within a business day of exchanging the EM
Component
1420 at a metering point. The registry could also report errors and changes,
allowing
reports to be re-run with the up to date information. When the registry
changes,
notifications can be communicated to entities needing to know about the
updates. Some
good techniques to do this comprise: email, USENET/NNTP, HTTP, TLS, SSL,
S/MIME, RDF, Rich Site Summary, RDF Site Summary, Really Simple Syndication,
or
CSV. This scheme easily supports the replacement of installed EM devices that
were
assigned a specific metering point identification and removed because they
failed, were
upgraded to better versions or were sent for scheduled testing to ensure they
are still
reading correctly.
ENCRYPTION, AUTHENTICATION, INTEGRITY AND NON-
REPUDIATION
[001541 When two entities, particularly unrelated entities, share information,
such as
significant EM Data, including data that has economic consequences such as
energy
profiles, WAGES profiles, revenue data and so forth, the entities want to be
sure that
the transmission is private and/or the recipient of the data can trust the
source and the
content. When an EM Device receives data such as a control command, or
economic
data such as pricing information, it is critical that the device can
authenticate the sender
and be sure of the integrity of the data.
[00155] Servers will frequently archive, forward or embed the contents of an
encrypted
or signed message, losing the encryption and signing in the process. In some
cases, a
first piece of verifiable data is sent to a first destination, and some action
such as
aggregation or calculation is performed using the data to produce a second
piece of
data. The two pieces of data are now sent to a second destination, and the
recipient
wants to verify that neither piece of data has been tampered with. Various
techniques
can be employed that allow for the archival, forwarding and embedding of EM
data
while retaining a way to verify that the data source is authentic and that the
data has not
been tampered with. Such techniques will be discussed in greater detail below.
[001561 Encryption provides privacy by preventing anyone but the intended
recipient
of a message from reading it. Encryption can be provided point-to-point, or
end-to-end,
depending on the nature of the channel and the data. Only a portion of the
data may be
CA 02462212 2011-01-10
48
encrypted. EM Components can encrypt messages using encryption schemes such as
PGP, S/MIME, XML Encryption, or SSL.
[00157] Signing data provides assurance that the data comes from the desired
source,
and that it has not been tampered with. Signing helps prevent so-called "man
in the
middle" attacks where someone with legitimate or illegitimate access to data
intercepts
the data and tampers with it or forges data. This can occur with all aspects
of
communication, including installing certificates, and exchanging frameworks
and all
types of EM data.
[00158] Non-repudiation prevents the sender from denying that they sent a
message.
Non-repudiation can be provided by signing, electronic witnessing and
technologies
that assert a document was read before it was signed. Similar techniques exist
for
ensuring non-repudiability of contracts. Where EM Component 1420 is an EM
Device,
EM Component 1420 can sign data, data packets or messages using PGP, S/MIME,
XML Signature or TLS/SSL to provide for non-repudiation of those messages or
data.
[00159] Where EM Component 1420 is an EM Device, computing cipher data and
transmitting signed data can be computationally too expensive to perform in
real time,
or require too much memory. Cipher data includes hashes, digital signatures,
and
encrypted data. There are several ways to reduce these costs or amortize them
over
time.
[00160] In one embodiment, Security Module 1425 compresses the data before
calculating the cipher data, and the cipher data recipient decompresses the
data before
reading it. The cipher data, which may be compressed data, is generated
incrementally
in advance of the need to send it. This is very useful when the data is being
generated
over a long period of time. When it is time to send the cipher data, it is
already
computed. If the cipher data is a security hash, the data is streamed out to a
buffer or
register in the format that it will be signed and sent as, the data is used in
the
computation of the digest or hash value, and the data is thrown away. A
variety of
buffer sizes can be used, and the frequency of updating the hash can vary as
well. When
the data needs to be sent to a recipient, the signature is already calculated
and EM
Component 1420 streams the data without performing any potentially expensive
hash
functions and includes the pre-calculated data according to the security
scheme. The
data and signature can be encoded according to S/MIME, PGP or various other
formats.
This technique is useful for higher-level protocols or formats, like S/MIME,
PGP, or
XML Signature, because the plaintext doesn't incorporate time varying or
packet based
CA 02462212 2011-01-10
49
protocol information. In contrast, lower level protocols like IPSec may
incorporate
protocol information that cannot be computed in advance in the plaintext, so
the cipher
text cannot be computed as far in advance.
[00161] In an alternate embodiment, the process is modified to stream
canonical XML
or some other format compatible with XML signing to the buffer so that the
signature
will be compatible with the XML signing specification of the World Wide Web
Consortium ("W3C"). The actual XML transferred to a recipient may be formatted
differently from the format used to generate the signature, but the recipient
can still
verify the signature by transforming the received XML to the format used for
the
generation of the signature. In this case, XML Signature can be used to
authenticate the
signature or hash. This strategy makes it possible to generate authenticable
load profiles
in advance without using much memory, which can be quite valuable when EM
Component 1420 has a slow processor.
[00162] In an alternate embodiment, messages are sent only occasionally. When
the
messages are processed by an automated system and reports are only created
every day,
or week, or month, there is some leeway in when the data must be sent. In this
case,
encryption and signing calculations can be executed only when there is free
processing
time. This scheme works well on EM devices where important real-time
calculations
can take up to 100% of available calculation time for small periods, but over
time
periods of a few hours there is processing time to spare.
[00163] In an alternate embodiment, encrypted data is streamed across the
Internet as
it is generated using the aforementioned techniques. This has the advantage
that EM
Component 1420 does not need to store encrypted data.
[00164] In an alternate embodiment, EM Component 1420 contains a removable
storage device that can contain EM data. This removable storage device may be
removed from time to time to upgrade configuration data, or to download stored
data.
The EM Component 1420 may be fitted with a physical lock that prevents
unauthorized
individuals from taking the removable storage device.
SIGNING
[00165] EM Component 1420 transmits a message to EM Component 1430 that
contains the data or encrypted version of that data that is being exchanged in
a secure
fashion. The message may also contain a public key, a PKI certificate, and one
or more
message digests, which are electronic signatures.
[00166] In one embodiment, this signing is implemented using XML signing
CA 02462212 2011-01-10
technology. XML signing technology allows the signing of a portion of an XML
document by various parties. An XML document can contain a signature that
references
portions of the signed document; that is, the data and the signature are in
the same
document. To allow for verification, EM Component 1420 produces an XML
document
5 with EM data and a signature of the EM data. This XML document can now be
verified
separately from the transport mechanism that it was delivered with. Because
the
document is an XML file it can be processed with typical XML software tools
such as
Extensible Stylesheet Language ("XSL") and Document Object Model ("DOM"). The
document can be archived or embedded in another document while maintaining the
10 verifiability of the signature. This can be of particular value when the
document
contains energy readings and a bill for that energy. The bill receiver will
have
confidence that they are being billed for the correct amount of power
consumed.
[00167] Alternate means for providing signing include employing S/MIME, PGP,
using XML Signature in a manner compatible with the WS-Security SOAP format,
15 signing a row of data when the data are tabular or where the data is in
rows, signing a
tuple of each datum and the time associated with that datum, storing the
signature in
one or more fields or registers in a register or binary based protocol such as
those used
by MV90, MODBUS or ION .
[00168] In an alternate embodiment if the data and/or hash are not XML, the
signature
20 or message digest can be created by appending the fields together in some
manner
including but not limited to: appending the bytes of the fields together;
converting the
data to a form of XML and using the XML Signing techniques; converting to CSV
and
then signing the rows. It will be appreciated there are many ways to do this.
[00169] Entities with different identities can sign different data. For
example, an
25 entity may sign a SOAP message indicating that the sender is a particular
device
authorized to send data to the receiver, and the signer of data within that
message may
be the entity that actually measured that data. One instance when this is
useful is when
secure data is gathered from a device, the data is stored and sent to another
system later
on.
30 [00170] In operation, before EM Component 1420 transmits a message to EM
Component 1430, if it does not already have in its possession the public key
of EM
Component 1430 it requests it from Security Services 1400 via channel 1450.
Security
Service 1400 returns the public key of EM Component 1430. Security Module 1425
encrypts the message using the EM Component 1430 public key, signs the message
CA 02462212 2011-01-10
51
using the EM Component 1420 private key and transmits the message over channel
1455 to EM Component 1430. Security Module 1435 now requests Security Services
1400 for the public key of EM Component 1420 via channel 1451. Security
Services
1400 returns the public key of EM Component 1420 via channel 1451. Security
Module
1435 decrypts the message using its own private key, and uses the EM Component
1420 public key to verify the integrity of the received data. It will be
appreciated that
public keys are typically represented by means of certificates that
encapsulate the key
and other information that a CA warrants about the owner of the certificate.
It will also
be appreciated that one or more parts of the message described above may be
encrypted
or signed.
[00171] In an alternate embodiment, EM Component 1420 and EM Component 1430
may cache the others public key in a safe place, and refer to that when
encrypting and
verifying, only checking in with the Security Services 4100 on a periodic
basis. This
reduces traffic and the need for a connection to the Security Services 1400,
and speeds
up the verification process.
[00172] In an alternate embodiment, where EM Component 1420 and EM Component
1430 are communicating via email, a certificate is attached with the message.
[00173]
In an alternate embodiment, EM Component 1420 and EM Component 1430 each
send a certificate to the other party before starting to send signed messages.
[00174]
In an alternate embodiment, EM Component 1420 is transmitting HTML to EM
Component 1430. Once again there is a need to protect the content of the
transmissions
between the two components 1420, 1430, and to verify the source of the data.
Current
designs implement this security at the transport level using SSL. This
solution is
problematic however, as SSL is processor intensive and is also encrypted and
not
cacheable by proxy servers. Instead, the XHTML data is signed using XML
signing
techniques described by the W3C. An XHTML module can also be provided if one
is
not publicly available to represent the signature in XHTML in a specific way.
Then a
browser plug-in may be created if the browser vendor does not support XHTML or
XML signing. In this case the HTML data is signed, allowing standard PKI
techniques
to be used to verify the HTML data is from the source it claims to be and that
the data
has not been tampered with. If the HTML document is then saved, it remains
verifiable,
as the signature remains intact and valid. The HTML document can be cached in
a
proxy server for efficient system deployment.
[00175] A stand-alone message may be carried through a variety of transports
and
CA 02462212 2011-01-10
52
protocols as it travels from EM Component 1420 to EM Component 1430. The
message
may even change format; for example, the same XML Infoset can be represented
in
different serializations such as canonical and WBXML. In a message such as an
XML
or SOAP message, the authentication token may only authenticate a portion of
the
message, or the entire message.
[00176] In an alternate embodiment, any stored data, including cached data and
data
stored in a database, is tagged with a digital signature. When the data is
retrieved, the
digital signature can be used to verify that the data has not been tampered
with over
time.
[00177] In an alternate embodiment, where EM Component 1420 is an EM device,
EM
Component 1420 is producing a series of periodic readings of various
parameters.
Based on the readings and the time, a digital signature is produced and placed
in the
recorder, possibly as another channel. In this context, a channel is a column
in the
recorder, the column having a defined meaning. Alternately a row in the
recorder is
used to store a signature of a predefined number of previous rows. The EM data
and
signatures are retrieved and stored in a central data collection or billing
system on EM
Component 1430. An application validates that the readings are authentic and
flags the
ones that are not. For added security, Security Module 1425 can also encrypt
the data
before transmitting it. The EM data and signatures can be regenerated from the
database
to verify the provenance of the data at a later time.
[00178] In an alternate embodiment, the EM Component 1420 private key is used
to
sign firmware or frameworks or a hash or digital signature thereof after they
are
installed on EM Component 1420. EM Component 1420 occasionally verifies the
signature to ensure that the firmware and / or framework has not been tampered
with or
corrupted. One advantage of using a signature over a CRC check or other one-
way
function is that an antagonist will find it very difficult to forge a
signature whereas they
could forge a CRC after tampering with the firmware.
MEASUREMENT ASSERTION TECHNIQUES
[00179] A consumer of data may wish to verify that received data represents
what the
data provider claims it represents. It is difficult for a user to confirm the
calculation
techniques, source registers and source modules used to arrive at a value, so
some
techniques are needed to aid in this.
[00180] Where EM Component 1420 is an EM device, EM Component 1420 produces
values based on registers or modules. These registers or modules typically
have no
CA 02462212 2011-01-10
53
indication of the measurement they represent. The vendor and / or technician
who
configured EM Component 1420 affirms that the register or module value asserts
a
particular measurement. To ensure that the consumer of that value knows that
they are
getting the asserted measurement, some fundamental information about how that
measurement is produced is provided. This information is digitally signed by
the
asserter so that the consumer knows the identity of the entity making the
assertion, and
the technique used to calculate the measurement. This description may take the
form of
an XML document. A method of verifying that this set of registers or modules
is in use
in the actual device providing the measurement is also necessary.
[00181) In a related scenario, the consumer of EM firmware or frameworks
requires
confidence that any firmware or frameworks they are uploading to EM Component
1420 have not been forged or tampered with, and that they are released,
supported
versions. Signatures and certificates are either included in the firmware or
framework
file, or in a file separate from the firmware or framework. The certificates
are revoked if
there is a product hold on the firmware, or if it is out of date. The firmware
upgrade
program warns the user not to upgrade firmware that is unsigned, or firmware
whose
signing certificate has been revoked. A list of valid and revoked certificates
is stored on
a mission critical server, which may be provided by the device manufacturer as
a
Security Service 1400.
[00182] Software may check for valid signatures before an upload is attempted,
and
only allow certain users to upload unverified firmware. The firmware itself
may verify
signatures to ensure firmware has not been tampered with and is from an
authorized
source, and that the entity attempting the upgrade is authorized to perform an
upgrade.
Third parties may upload their own firmware written in their language of
choice, such
as Java, Prolog, Haskell, binary executable code, C#, ECMA Common Language
Runtime ("ECMA CLR"), or ION Object Configurations. Depending on the
platform,
source code or some repurposed version of the source code (i.e. ECMA CLR or
target
processor machine code) is digitally signed by the party and uploaded. Such
code would
be allowed to perform only specific actions based on trust level of the
signer. For
example, unsigned code or code signed by a non-trusted entity might only be
allowed to
read registers. A subsystem would prevent the client's code from performing
invalid
operations, such as accessing memory it shouldn't. That may require that the
compiled
code is Java, or ECMA CLR code that the subsystem can prove is not damaging.
Allowing binary code to be deployed may not be automatically verifiable, in
which case
CA 02462212 2011-01-10
54
only trusted users may be allowed to upload it.
[001831 In an alternate embodiment, a framework designer designs forms that
framework operators will enter values into while programming EM devices. The
framework has a built in form allowing the framework or specific configuration
values
within the framework to be changed. The forms may be built with various
technologies,
including HTML, XFORMS, or XML E-Forms developed by PureEdge Solutions of
Victoria, BC, Canada. The framework designer signs the framework using PKI
techniques and arranges for a timestamp from a Security Service 1400. A
template is
created from a framework, using the framework and an optional firmware
specification.
A framework operator enters values onto the forms, signs and uploads the
framework or
template to EM Component 1420.
[001841 Any entity receiving EM data from EM Component 1420 can't be sure if
they
should trust the data. Each message they receive from EM Component 1420
contains a
template signature from the framework designer, a signature about the
configuration by
the framework operator, the message contents (such as load profile), and a
signature
from EM Component 1420 that verifies that it created the message contents, and
that it
has verified that the framework operators' signature matches the configuration
uploaded
by the framework operator, and that the template signature by the template
designer
matches the template on the EM Component 1420. The recipient can verify the
message
by comparing the signatures by the framework operator and framework designers
of the
configuration parameters and template to the expected signatures, and verify
the
message signature by EM Component 1420 is valid and from a trusted source.
This
strategy provides non-repudiation of the framework design, the configuration
of EM
Component 1420, and of EM data from EM Component 1420. A typical application
for
this is in Utility Meter Shops.
[001851 In an alternate embodiment, where EM Component 1420 is an EM device,
the
consumer of data (EM Component 1430) knows and approves of certain device
configurations for EM Component 1420 that include the firmware, software,
configuration parameters, and frameworks. EM Component 1420 produces a value
representing the configuration using a known algorithm of its configuration,
and the
recipient EM Component 1430 generates a value using the same algorithm using
an
approved configuration for EM Component 1420. This value is a fingerprint of
the
device configuration. Functions suitable for generating such fingerprints
typically have
the property of easy computation of the value, while being hard or impossible
to
CA 02462212 2011-01-10
compute the input from the value and being collision resistant, that is, it is
hard to find
two inputs that have the same fingerprint value. The data EM Component 1420
sends is
in some way combined with the fingerprint value and then EM Component 1420
signs
this aggregate before sending. In another embodiment, a hash of the data and
the
5 fingerprint token are combined, and the signature is generated based on the
combinations of these two security tokens. In another embodiment the
fingerprint is
appended to signed data and is signed again or vice versa. In another
embodiment, the
device configuration itself is used as its own fingerprint. It will be
appreciated that there
are many ways of securing this transaction. The receiver, EM Component 1430,
of data
10 can now employ PKI techniques to verify both that the data has not been
tampered with
and was generated by EM Component 1420 while in an approved configuration.
[00186] In another embodiment, EM Component 1430 is not concerned about
approved device configurations; it simply wants an assurance that something
that is
purported to be a measurement is in fact that measurement with some chain of
15 accountability. For example, if A can be trusted as honest, and `A states
`B has value
a"' can be trusted, then EM Component 1430 can believe that B has value P. A
statement like "B states t" can be trusted by a receiver of such statement
from B by
verifying an electronic signature of B. If it turns out B is lying, B can be
held
accountable later on.
20 [00187] Statements can be made by PKI certificate issuers about the
identity and
trustworthiness of those receiving certificates to perform certain actions.
Owners of
such certificates may make assertions about other entities such as devices,
companies,
or people. Those assertions may be more along the lines of security assertions
like the
ability to issue certificates to certain other entities, or other things, like
trusted to create
25 or configure device firmware or device configuration parameters. If the
recipient of EM
data is provided the set of assertions and a set of rules of when to trust
statements, then
that recipient can decide whether EM data received from an EM Device should be
trusted. It will be appreciated this can be complex, as statements may include
statements about further reifications. This inference process can be combined
with the
30 process of verifying that certain firmware or configuration or certain
subsets thereof
were used to generate the EM data.
FEDERATED SECURITY
[00188] Two or more applications or organizations (NAEs) don't fully trust one
another, but wish to share some EM data and resources. These NAEs identify
users with
CA 02462212 2011-01-10
56
a federated security scheme that may be based on Kerberos, which allows users
from
one NAE to be identified to another NAE. Web service security can be combined
with
federated security based authentication and access control to provide for
secure
exchange of EM data between users of different NAEs. [00189] Federation is a
technology and business agreement whereby users (including non-human users
such as
EM devices and EM software) that are part of a single or separate organization
are able
to interact through a system of authentication that allows for distributed
processing,
data sharing and resource sharing.
[00190] In one embodiment, EM Component 1420 is a computer running EM
software, that needs to retrieve EM data from EM Component 1430, which is an
EM
device owned by an NAE. The EM software is authorized to retrieve certain
types of
EM data from EM Component 1430. EM Component 1420 creates a communications
link 1455 with EM Component 1430. The EM Software requests some data and EM
Component 1430 uses a PKI signing scheme to sign the data before sending it.
In this
fashion any user can be confident of this data's provenance.
[00191] These schemes provide authentication of data source and integrity
between
applications and users in different organizations while limiting access to
resources
between private networks.
SECURITY GODFATHER
[00192] As described in the aforementioned co-pending application, there are
various
reasons including cost and legacy equipment that might prevent some EM
Components
in a system from having their own security module. Referring again to FIG. 1,
the
Security Module 1425 of EM Component 1420 provides access through channel 1460
to Security Services 1400 for the EM Components (not shown) located in EM
Network
1480, and Security Module 1435 of EM Component 1430 provides access through
channel 1465 to Security Services 1400 for the EM Components (not shown)
located in
EM Network 1485. EM Networks 1480, 1485 can be made more secure using physical
security techniques.
INTEGRATED EM SECURITY SYSTEM
[00193] Although protecting components and channels of a network and system is
important, the key is to tie the various security mechanisms together into an
integrated,
secure EM System. The security of a system is only as strong as the weakest
link, so
placing security features on various components in a system and leaving other
components exposed opens the system to attack. It is necessary when designing
and
CA 02462212 2011-01-10
57
configuring a system to consider all components and how they interact.
[00194] In a naive system a single perimeter may be erected around an EM
System,
designed to keep unauthorized users and problems out. However, this system
will be ill-
equipped to handle attackers that have managed to bypass the external
perimeter, and
users with malicious intent who are authorized to access components within the
perimeter. Instead of a single perimeter protecting an EM System, multiple
layers of
security are needed, where an authorization must be produced to gain access to
various
areas. This authorization is managed by the security system once a user has
logged on.
Setting up specific access levels for accessing various parts of the system
and assigning
access levels to each authorized user helps to prevent malicious intruders or
employees,
or misguided employees from creating havoc.
[00195] Referring now to FIG. 13, EM Components 1510, 1520 each contain a
Security Module 1515 and 1525 respectively. Security Modules 1515, 1525
communicate via channel 1530. EM Components 1510, 1520 together form an EM
Network 1505. EM Components 1560, 1570 each include a Security Module 1565 and
1575 respectively. Security Modules 1565, 1575 communicate with each via
channel
1580. EM Components 1560, 1570 together form an EM Network 1550. EM Networks
1505, 1550 communicate with each over via channel 1540. Security Modules 1515,
1525 of EM Network 1505 are able to communicate with Security Modules 1565,
1575
of EM Network 1550 via channel 1540. EM Network 1505, 1550 and channel 1540
form an EM System 1500. EM System 1500 allows disparate users to communicate
and
access remote resources in a secure fashion. It will be appreciated that EM
Network
1505, 1550 may contain additional EM Components not shown in this figure and
that
EM System 1500 may contain additional EM networks not shown in this figure.
[00196] It will be appreciated that components in this system can be separated
by
network boundaries, perimeters, firewalls, servers, router, communications
links, and
protocols that are omitted here for clarity. However, EM components can send
data to
one another without worrying about intermediaries that the data passes
through. Some
EM Components have user interfaces and direct user access, whereas others may
only
be available via remote access. Not all EM Components have a Security Module,
some
may be inherently secure based on physical location and other factors, or may
receive
security services from other EM Components. In some cases, rather than
distributing
security modules across a system, it may make more sense to provide a security
server
that manages security for a whole system.
CA 02462212 2011-01-10
58
[00197] Security Modules 1515, 1525, 1565, 1575 protect the system, detect
that there
is an attack or intrusion, and react appropriately to the attack. They are
capable of
sharing security information with one another. They can share logon and
permissions,
report security breaches, manage perimeter security, analyze an attack,
identifying the
location and what is affected, take some defensive action and provide security
for both
local and remote EM devices.
[00198] In one embodiment a database that includes access rules for users is
integrated
into the EM System 1500. This database could be stored on a server (not
shown), which
is accessible by Security Modules 1515, 1525, 1565, 1575. This database
centralizes
and simplifies user authentication and management of user / access privileges
by
including rules about who can do what, and only allowing certain users to do
certain
things. Keeping this database up to date is important, so that it mirrors all
changes in
employment status and responsibility level.
[00199] In an alternate embodiment, a limitation is placed on those who can
access a
system remotely.
[00200] In an alternate embodiment, access control rules are enforced between
all
components, with pre-defined rules of which components can communicate with
which
other components, and what they are allowed to communicate.
[00201] In an alternate embodiment, a distributed firewall is implemented;
this entails
placing the firewall on the various components of the system, rather than at
the
perimeter of the network.
[00202] In an alternate embodiment, one or more VPNs are employed to provide
additional security.
[00203] In an alternate embodiment, EM System 1500 incorporates integrated sub-
systems including cameras, biometric authentication, smartcards, access tokens
and
other types of security devices. These devices may be implemented on one or
more
Security Modules 1515, 1525, 1565, 1575. Security Modules 1515, 1525, 1565,
1575
share security information with one another. For example, a user could log
onto EM
Component 1510 either locally, or remotely from EM Component 1560. Based on
the
access rights pre-assigned for that user, they may be able to access various
resources
and controls on other EM Components 1520, 1570 in the EM System 1500, without
logging on to those components. Alternately, that user may be prevented by
accessing
any components and resources in EM System 1500 because they could not
correctly
authenticate. Access tokens, smart cards and biometric authentication prevent
users
CA 02462212 2011-01-10
59
from inadvertently revealing their passwords.
[00204] In an alternate embodiment, EM System 1500 implements an Intrusion
Detection System, perhaps on one or all of Security Modules 1515, 1525, 1565,
1575,
that is able to detect an attempt to compromise the integrity of the system.
The
identification of unauthorized attempts can be implemented by monitoring
patterns of
access and behavior on individual EM Components 1510, 1520, 1560, 1570, on EM
Networks 1500, 1550, or on an entire EM system. Methods of monitoring include
supervising network traffic and analyzing it for unusual activity and access
attempts,
using rules that determine who can access what, using statistical or
artificial intelligence
techniques, reviewing system, event or audit logs looking for anomalies, or
some
combination of these methods. The Intrusion Detection System has the
capability to
take remedial action such as publishing an alarm, shutting down the system,
logging the
attack, and reporting the attack to a central server or pager. The Intrusion
Detection
System may choose to not respond to certain types of requests if it thinks it
may be
under attack, preventing the attacker from intruding further into the EM
System 1500.
[00205] The Intrusion Detection System can employ various techniques such as
honey
pots and burglar alarms to distract or identify would be intruders. A honey
pot is a part
of the system that looks particularly attractive to an intruder, but in fact
has been
planted there for the purpose of gathering data about the identity of the
intruder and
what they want to do, without allowing them to access the real system. Burglar
alarms
are devices or pieces of software that alarm when they are accessed. They are
positioned to protect sensitive applications or data, and may be configured to
alert the
whole system that it is under attack, or to contact an administrator.
[00206] The system creates an audit trail or event log of all security
sensitive events,
such as connection attempts, data upload and download attempts, and attempts
to alter
configuration settings. The event log records such details as timestamp,
success of the
attempt and address the attempt was generated from.
[00207] It will be appreciated that the various security means previously
described
provide more effective protection when they are layered together, as the
system
becomes more difficult to intrude. For example, EM System 1500 can be
protected by
firewalls around each EM Network 1505, 1550, firewalls in various EM
Components
1510, 1520, an Intrusion Detection system as discussed earlier, and the
application of
cryptography to all communications.
CA 02462212 2011-01-10
BUSINESS PROCESS
[00208] A company provides a business process wherein the key business
strategy is
selling secure EM Systems. This could involve providing security services to
EM
device and software suppliers, owners or users. It can also involve providing
security
5 insurance against things such as data theft, viruses, intrusions, security
breaches, loss of
income resulting from the previous, and damages when confidential information
is
stolen.
[00209] It is therefore intended that the foregoing detailed description be
regarded as
illustrative rather than limiting, and that it be understood that it is the
following claims,
10 including all equivalents, that are intended to define the spirit and scope
of this
invention.
