Location determination of power system disturbances based on frequency responses of the system

• US 20070150114A1
• Filed: 10/27/2006
• Published: 06/28/2007
• Est. Priority Date: 12/12/2005
• Status: Active Grant

• Current Assignee: Virginia Tech Intellectual Properties, Inc. (Virginia Polytechnic Institute and State University)
• Original Assignee: Virginia Tech Intellectual Properties, Inc. (Virginia Polytechnic Institute and State University)
• Inventors: Gardner, Robert Matthew, Liu, Yilu, Zhong, Zhian
• Granted Patent: US 7,519,454 B2
• Time in Patent Office: Days
• US Class Current: 700/286
• CPC Class Codes: H02J 3/08 Synchronising of networks
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/388 Islanding, i.e. disconnection of local power supply from the network

Abstract

A system for detecting and locating a disturbance event within a power grid includes a series of frequency disturbance recorders (FDRs) taking measurements in the power grid at dispersed points of the power grid, an information management system, configured to receive data from the series of FDRs and analyze the received data and a communications network interconnecting the series of FDRs and the information management system. The information management system is configured to examine orders and patterns of receipt of frequency changes at the FDRs in the data caused by the disturbance event and to triangulate a location of the disturbance event based on the orders and patterns of receipt of the frequency changes. Example methods of detection and location of disturbance events are also described.

Claims

1. A system for detecting and locating a disturbance event within a power grid, said system comprising:

a series of frequency disturbance recorders (FDRs) taking measurements in the power grid at dispersed points of the power grid;

an information management system, configured to receive data from the series of FDRs and analyze the received data; and

a communications network interconnecting the series of FDRs and the information management system;

wherein information management system is configured to examine orders and patterns of receipt of frequency changes at the FDRs in the data caused by the disturbance event and to triangulate a location of the disturbance event based on the orders and patterns of receipt of the frequency changes.

2. The system of claim 1, wherein the information management system is configured to detect disturbance events comprising transmission line trips, generator trips and load rejections.

3. The system of claim 1, wherein the series of FDRs comprises at least three FDRs.

4. The system of claim 1, wherein the information management system is configured to apply a least squares analysis to the data of the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

5. The system of claim 1, wherein the information management system is configured to apply Newton'"'"'s method for solving non-linear equations to the data of the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

6. The system of claim 1, wherein the information management system is configured to apply a gradient search to the data of the orders and patterns of receipt of frequency changes at the FDRs to minimize distances between a probable event location and the series of FDRs to determine the location of the disturbance event.

7. The system of claim 1, wherein the information management system is configured to compare the data of the orders and patterns of receipt of frequency changes at the FDRs with other data received from past events to determine the location of the disturbance event.

8. The system of claim 1, wherein the information management system is configured to compute propagation delays from a possible event to the series of FDRs and compare the data of the orders and patterns of receipt of frequency changes at the FDRs with the computed propagation delays to determine the location of the disturbance event.

9. The system of claim 1, wherein the information management system is configured to apply a Parzen window approach to the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

10. The system of claim 1, wherein each FDR of the series of FDRs is synched to remaining FDRs through communication with Global Positioning System satellites.

11. The system of claim 1, wherein each FDR of the series of FDRs is configured to send data packets to the information management system through the communications network which are network time-stamped.

12. A method for detecting and locating a disturbance event within a power grid, said method comprising the steps of:

receiving frequency changes, caused by the disturbance event, at a series of frequency disturbance recorders (FDRs) taking measurements in the power grid at dispersed points of the power grid;

transferring data based on the frequency changes to an information management system from the series of FDRs through a communications network interconnecting the series of FDRs and the information management system;

analyzing the received data by the information management system by examining orders and patterns of receipt of the frequency changes at the FDRs; and

triangulating a location of the disturbance event based on the orders and patterns of receipt of the frequency changes.

13. The method of claim 12, wherein the step of triangulating the locations comprises triangulating locations of disturbance events comprising transmission line trips, generator trips and load rejections.

14. The method of claim 12, wherein the step of transferring data comprises transferring data from at least three FDRs.

15. The method of claim 12, wherein the analyzing step comprises applying a least squares analysis to the data of the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

16. The method of claim 12, wherein the analyzing step comprises applying Newton'"'"'s method for solving non-linear equations to the data of the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

17. The method of claim 12, wherein the analyzing step comprises applying a gradient search to the data of the orders and patterns of receipt of frequency changes at the FDRs to minimize distances between a probable event location and the series of FDRs to determine the location of the disturbance event.

18. The method of claim 12, wherein the analyzing step comprises comparing the data of the orders and patterns of receipt of frequency changes at the FDRs with other data received from past events to determine the location of the disturbance event.

19. The method of claim 12, wherein the analyzing step comprises computing propagation delays from a possible event to the series of FDRs and comparing the data of the orders and patterns of receipt of frequency changes at the FDRs with the computed propagation delays to determine the location of the disturbance event.

20. The method of claim 12, wherein the analyzing step comprises applying a Parzen window approach to the orders and patterns of receipt of frequency changes at the FDRs to determine the location of the disturbance event.

21. The method of claim 12, further comprising synching each FDR of the series of FDRs to remaining FDRs through communication with Global Positioning System satellites.

22. The method of claim 12, wherein the step of transferring data comprises sending data packets to the information management system through the communications network which are network time-stamped.

23. A method of detecting and locating events in a collective, the method comprising the steps of:

receiving changes, caused by the event, at a series of recorders taking measurements in the collective at dispersed points of the collective;

transferring data based on the changes to an information management system from the series of recorders through a communications network interconnecting the series of recorders and the information management system;

analyzing the received data by the information management system by examining orders and patterns of receipt of the changes at the recorders; and

triangulating a location of the event based on the orders and patterns of receipt of the changes by the recorders.

24. The method of claim 23, wherein the step of triangulating the locations comprises triangulating locations of disturbance events in a power grid comprising transmission line trips, generator trips and load rejections.

25. The method of claim 23, wherein the step of transferring data comprises transferring data from at least three recorders.

26. The method of claim 23, wherein the step of receiving changes comprises receiving changes in systems monitoring at least one of weather, lightening strikes, voting and traffic.

27. The method of claim 23, further comprising synching each recorder of the series of recorders to remaining recorders through communication with Global Positioning System satellites.

28. The method of claim 23, wherein the step of transferring data comprises sending data packets to the information management system through the communications network which are network time-stamped.