State trajectory prediction in an electric power delivery system

• US 9,819,227 B2
• Filed: 02/26/2014
• Issued: 11/14/2017
• Est. Priority Date: 02/26/2013
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Zweigle, Gregary C., Hewitt, Eric J., Blood, Ellery A.
• Primary Examiner(s): Coyer, Ryan
• Application Number:
  US14/190,470
• Publication Number:
  US 20140244058A1
• Time in Patent Office: 1,357 Days
• Field of Search: 700291
• CPC Class Codes: H02J 13/00001 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 3/001 Methods to deal with contingencies, e.g. abnormalities, faults or failures
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/18 using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 10/40 Display of information, e.g. of data or controls
• CPC Class Codes: Y04S 10/50 Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 10/52 Outage or fault management, e.g. fault detection or location

Abstract

Disclosed is state trajectory prediction in an electric power delivery system. Electric power delivery system information is calculated from measurements by intelligent electronic devices (IEDs), and communicated to a state trajectory prediction system. The state trajectory prediction system may be configured to generate a load prediction profile. The load prediction profile may provide a predicted response of a load at a future time. Further, the state trajectory prediction system may be configured to generate a generator prediction profile that provides a predicted response of a generator at a future time. The state trajectory prediction system may generate a state trajectory prediction based, at least in part, on the load prediction profile and the generator prediction profile. The state trajectory prediction may represent a future state of the electric power delivery system.

Claims

1. A system for state trajectory prediction in an electric power delivery system, comprising:

a data communication network configured to gather a plurality of values based on measurements associated with the electric power delivery system;

a power flow calculation subsystem configured to;

initialize a plurality of time-synchronized complex values representing electrical conditions at a plurality of buses in the electric power delivery system;

identify each bus with positive power flow as a generator; and

identify each bus with a negative power flow as a load;

a state trajectory prediction system in communication with the data communication network and configured to receive the values and to use the values to develop;

a load prediction profile associated with at least one bus identified as a load and based, at least in part, on the measurements of the electric power delivery system and the plurality of time-synchronized complex values, the load prediction profile configured to provide a predicted response of a load at a future time;

a generator prediction profile associated with at least one bus identified as a generator and based, at least in part, on the measurements of the electric power delivery system and the plurality of time-synchronized complex values, the generator prediction profile configured to provide a predicted response of a generator at the future time;

a plurality of predicted values configured to represent the electric power delivery system over a period of time and determined based on an iterative computation of the predicted response of the load and the prediction response of the generator at a plurality of step intervals;

a state trajectory prediction configured to represent a future state of the electric power delivery system based, at least in part, on the plurality of predicted values, the plurality of time-synchronized complex values, and identification of each bus; and

a control system configured to implement a control action based, at least in part, on the state trajectory prediction.

2. The system of claim 1, wherein each of the plurality of step intervals comprises about 5 seconds.

3. The system of claim 1, wherein the state trajectory estimation system further comprises a display subsystem configured to display a representation of the future state of the electric power delivery system.

4. The system of claim 3, wherein the display subsystem is further configured to provide a graph representing at least one metric of the future state of the electric power delivery system.

5. The system of claim 4, wherein the graph represents one of a frequency, a voltage magnitude, a voltage angle, a current magnitude, a current angle, a real power magnitude, and a reactive power magnitude.

6. The system of claim 3, wherein the display system is further configured to provide a map configured to display the at least one of the predicted response of the load and the predicted response of the generator over a period of time that encompasses the future time.

7. The system of claim 1, wherein the period of time comprises approximately 30 minutes.

8. The system of claim 1, further comprising a control device prediction profile configured to provide a predicted response of a control device at the future time;

and wherein the state trajectory prediction is further based on the predicted response of the control device.

9. The system of claim 1, further comprising a topology determination sub-system configured to determine changes to a topology of the electric power delivery system;

and

wherein the state trajectory prediction is further developed based, at least in part, on the topology of the electric power delivery system.

25. The system of claim 9, wherein the control action comprises a discontinuous control action and the topology determination sub-system is further configured to develop the state trajectory prediction based on an updated topology following the discontinuous control action.

26. The system of claim 1, wherein the future state represents at least one future event associated with a confidence interval exceeding a threshold.

27. The system of claim 1, wherein the period of time is specified by a North American Electric Reliability Corporation following an N−

1 contingency.

10. A method for predicting a state trajectory in an electric power delivery system, comprising:

receiving a plurality of values based on measurements associated with an electric power delivery system;

initializing a plurality of time-synchronized complex values representing electrical conditions at a plurality of buses in the electric power delivery system;

identifying each bus with positive power flow as a generator;

identifying each bus with a negative power flow as a load;

obtaining a topology of the electric power delivery system;

determining a predicted response of a load at a future time using a load prediction profile;

determining a prediction response of a generator at a future time using a generator prediction profile;

iteratively computing a plurality of values representing the electric power delivery system over a period of time based on the predicted response of the load and the prediction response of the generator;

generating a state trajectory prediction representing a future state of the electric power delivery system based, at least in part, on the load prediction profile and the generator prediction profile;

implementing a control action based, at least in part, on the state trajectory prediction.

11. The method of claim 10, wherein the predicted response of the load is determined by iteratively advancing the load prediction profile using a power flow calculation system over a plurality of step intervals.

12. The method of claim 10, wherein the predicted response of the generator is determined by iteratively advancing the generator prediction profile using a power flow calculation system over a plurality of step intervals.

13. The method of claim 10, further comprising displaying a representation of the future state of the electric power delivery system.

14. The method of claim 13, wherein the representation of the future state of the electric power delivery system comprises one of a graph and a map, the graph and the map representing at least one metric of the future state of the electric power delivery system.

15. The method of claim 10, further comprising determining a predicted response of a control device at the future time;

and wherein generating the state trajectory prediction is further based on the predicted response of the control device.

16. A system for state trajectory prediction in an electric power delivery system, comprising:

a bus;

a processor in communication with the bus; and

a non-transitory computer-readable storage medium, comprising;

a load prediction profile module executable on the processor and configured to provide a predicted response of a load at a future time;

a generator prediction profile module executable on the processor and configured to provide a predicted response of a generator at the future time;

a power flow module executable on the processor and configured to;

initialize a plurality of time-synchronized complex values representing electrical conditions at a plurality of buses in the electric power delivery system;

identify each bus with positive power flow as a generator; and

identify each bus with a negative power flow as a load;

determine a plurality of predicted values configured to represent the electric power delivery system over a period of time and determined based on an iterative computation of the predicted response of the load and the prediction response of the generator at a plurality of step intervals; and

a state trajectory prediction module executable on the processor and configured to predict a future state of the electric power delivery system based, at least in part, on the plurality of predicted values.

17. The system of claim 16, further comprising:

a control device prediction module executable on the processor and configured to provide a predicted response of a control device at the future time; and

wherein the state trajectory prediction is further based on the predicted response of the control device.

18. The system of claim 16, further comprising:

a topology module executable on the processor and configured to determine changes to a topology of the electric power delivery system; and

wherein the state trajectory prediction is further based on the topology of the electric power delivery system.

19. A system for state trajectory prediction in a wide-area electric power delivery system, comprising:

a data communication network configured to gather a plurality of values based on measurements associated with the electric power delivery system at a plurality of geographically distributed locations;

a state trajectory prediction system in communication with the data communication network and configured to receive the values and to use the values to develop;

a load prediction profile based, at least in part, on the measurements of the wide-area electric power delivery system, the load prediction profile configured to provide a plurality of predicted responses of a load at a future time;

a generator prediction profile based, at least in part, on the measurements of the electric power delivery system, the generator prediction profile configured to provide a plurality of predicted responses of a generator at the future time;

a plurality of predicted values configured to represent the electric power delivery system over a period of time and determined based on an iterative computation of the plurality of predicted responses of the load and the plurality of prediction responses of the generator at a plurality of step intervals;

a state trajectory prediction configured to represent a future state of the wide-area electric power delivery system based, at least in part, on the plurality of predicted responses of the load and the plurality of predicted responses of the generator; and

a control system configured to implement a control action based, at least in part, on the state trajectory prediction.

20. The system of claim 19, wherein the plurality of predicted responses of the load comprise at least one of an increase in the load and a decrease in the load.

21. The system of claim 19, wherein the plurality of predicted responses of the generator comprise at least one of an increase in output of the generator and a decrease in the output of the generator.

22. The system of claim 19, wherein the generator comprises a renewable generation source and the plurality of predicted responses of the generator comprise a range of output from the renewable generation source.

23. The system of claim 19, wherein the state trajectory prediction system is further configured to develop a confidence interval associated with the state trajectory prediction based on the plurality of predicted responses of the load and the plurality of predicted responses of the generator.

24. The system of claim 23, where in the confidence interval comprises about an 80% confidence interval.