ELECTRIC POWER SYSTEM AUTOMATION USING TIME COORDINATED INSTRUCTIONS

• US 20110035076A1
• Filed: 08/10/2010
• Published: 02/10/2011
• Est. Priority Date: 08/10/2009
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Fischer, Normann, Morris, Robert E., Zweigle, Gregary C., Schweitzer, Edmund O. III, Whitehead, David E.
• Granted Patent: US 8,275,485 B2
• Time in Patent Office: Days
• US Class Current: 700/296
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 3/06 Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
• CPC Class Codes: H02J 3/16 by adjustment of reactive power
• CPC Class Codes: H02J 3/1821 using shunt compensators H02J3/1807, H02J3/1878 take precedence
• CPC Class Codes: Y02E 40/30 Reactive power compensation
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/00 Systems supporting electrical power generation, transmission or distribution
• CPC Class Codes: Y04S 10/18 using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
• CPC Class Codes: Y04S 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.

Claims

1. A system for controlling an electric power delivery system, comprising:

a communications network;

a plurality of intelligent electronic devices (IEDs), each IED comprising;

an IED network communications interface connected to the communications network, the IED network communications interface to communicate with other IEDs connected to the communications network; and

a monitored equipment interface to issue control instructions to monitored equipment;

a communication master in communication with the plurality of IEDs via the communications network, the communication master comprising;

a processor;

a communication master network communications interface to communicate with the plurality of IEDs connected to the communications network;

a computer-readable storage medium comprising;

a time coordinated instruction set comprising at least one execution action; and

instructions executable on the processor that enable the communication master to;

establish an execution time of a time coordinated instruction set comprising at least one execution action; and

transmit the execution time to the plurality of IEDs via the communication master network communications interface; and

wherein, the plurality of IEDs begin to execute the time coordinated instruction set at the execution time.

2. The system of claim 1, wherein at least one of the plurality of IEDs comprises an IED external time input configured to receive an external time signal from an external time source, and wherein the external time signal is utilized to determine the execution time.

3. The system of claim 1, wherein at least one of the plurality of IEDs comprises a sensor component configured to monitor at least one electrical characteristic of monitored equipment.

4. The system of claim 3, wherein the at least one of the plurality of IEDs is configured to evaluate a condition subsequent to the execution time using the at least one characteristic monitored by the sensor and to communicate a result of the evaluated condition to the communication master.

5. The system of claim 1, wherein the computer-readable storage medium further comprises instructions executable on the processor to enable the communication master to transmit the time coordinated instruction set via the communication master network communications interface to the plurality of IEDs.

6. The system of claim 1, wherein the computer-readable storage medium further comprises software instructions to:

obtain verification from a user prior to establishing an execution time.

7. The system of claim 1, wherein the computer-readable storage medium further comprises software instructions to:

query each of the plurality of IEDs identified to perform each execution action of the time coordinated instruction set prior to the execution time to determine readiness of each IED to perform each respective execution action of the time coordinated instruction set.

8. The system of claim 1, wherein the communication master comprises an automation controller.

9. The system of claim 1, wherein the communication master comprises an IED.

10. The system of claim 1, wherein the communication master comprises a supervisory control and data acquisition system.

11. The system of claim 1, wherein the communication master comprises a wide area control and situational awareness system.

12. The system of claim 1, wherein the time coordinated instruction set comprises a plurality of execution actions, and wherein the computer-readable storage medium further comprises software instructions to:

identify which of the plurality of IEDs is to perform each of the plurality of execution action of the time coordinated instruction set; and

transmitting each execution action to the respective IED.

13. The system of claim 1, wherein the time coordinated instruction set comprises a plurality of execution actions and at least one of the plurality of execution actions is associated with an offset time, the offset time specifying an offset execution time that follows the execution time by the offset time.

14. An IED configured to monitor and control a monitored equipment in an electric power delivery system, the IED comprising:

an IED network communications interface to communicate with other networked devices;

a monitored equipment interface to issue control instructions to monitored equipment in an electric power delivery system;

a processor, and

a computer-readable storage medium comprising;

software instructions executable on the processor that enable the IED to;

receive at least one execution action via the IED network communications interface, the at least one execution action comprising a control instruction to be issued to monitored equipment via the monitored equipment interface;

receive an execution time; and

execute the at least one execution action at the execution time.

15. The IED of claim 14, further comprising:

an IED external time input configured to receive an external time signal from an external time source;

wherein the external time signal is used to determine the execution time.

16. The IED of claim 14, further comprising a sensor component configured to monitor at least one characteristic of monitored equipment, and wherein the IED is configured to evaluate a condition monitored by the sensor subsequent to the execution time and to communicate a result of the evaluated condition via the IED network communications interface.

17. The IED of claim 14, wherein the computer-readable storage medium further comprises software instructions to:

generate a response to a query received via the IED network communications interface prior to the execution time to determine readiness of the IED to perform the at least one execution action.

18. The IED of claim 17, wherein the computer-readable storage medium further comprises software instructions to:

determine a status of monitored equipment via the monitored equipment interface; and

include the status of monitored equipment in the response.

19. A method for controlling an electric power delivery system by executing a time coordinated instruction set, comprising:

connecting a plurality of intelligent electronic devices (IEDs) in an electrical power delivery system via a data network;

determining a time coordinated instruction set comprising at least one execution action;

establishing an execution time;

transmitting the execution time to the at least one of the plurality of IEDs via the data network; and

the at least one of the plurality of IEDs performing the time coordinated instruction set at the execution time.

20. The method of claim 19, further comprising:

synchronizing the plurality of IEDs to a common time reference.

21. The method of claim 20, wherein synchronizing the plurality of intelligent electronic devices (IED) to a common time reference comprises each IED receiving a common time signal via an IED external time input.

22. The method of claim 19, further comprising:

at least one IED monitoring at least one characteristic of monitored equipment in communication with the electric power delivery system using a sensor.

23. The method of claim 22, further comprising:

evaluating a condition subsequent to the execution time using the at least one characteristic monitored by the sensor; and

communicating a result of the evaluated condition to the communication master.

24. The method of claim 19, further comprising obtaining verification from a user prior to establishing an execution time.

25. The method of claim 19, further comprising:

querying each of the plurality of IEDs identified to perform each execution action of the time coordinated instruction set prior to establishing an execution time to determine readiness of each IED to perform each respective execution action of the time coordinated instruction set; and

receiving confirmation from each IED of readiness to execute each of the execution actions.

26. The method of claim 19, wherein the time coordinated instruction set comprises a plurality of execution actions, and wherein the method further comprises:

identifying which of the plurality of the IEDs is to perform each of the plurality of execution actions; and

transmitting each execution action to the respective IED.

27. The method of claim 19, further comprising:

transmitting the time coordinated instruction set to at least one of the plurality of IEDs via the data network.