Apparatus, method, and system for wide-area protection and control using power system data having a time component associated therewith

• US 7,630,863 B2
• Filed: 09/18/2007
• Issued: 12/08/2009
• Est. Priority Date: 09/19/2006
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Jiang, Ping, Petras, Charles E., Zweigle, Gregary C., Guzman-Casillas, Armando
• Primary Examiner(s): Feliciano; Eliseo Ramos
• Assistant Examiner(s): Suarez; Felix E
• Application Number:
  US11/857,427
• Publication Number:
  US 20080071482A1
• Time in Patent Office: 812 Days
• Field of Search: 702/57, 702/60, 702/62, 702/64, 702/65, 702/179, 702/182, 702/188, 702/177, 702/187, 702/189, 324/76.11, 340/635, 700/295, 705/26
• US Class Current: 702/188
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02H 7/261 involving signal transmission between at least two stations transmission of signals in general H02H1/0061
• 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 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

Abstract

An apparatus, system and method in an electrical system using power system information or data associated therewith having a time component associated therewith sampled or obtained from the electrical system at a local and a remote location, wherein the local and remote data are time aligned and used to provide control, monitoring, metering, and/or automation to the electrical system. The local IED may be adapted to receive power system data from the remote IED, time align the local and remote synchronized power system data, and perform math operations on the local and remote power system data.

Claims

1. A system for power system automation, control or protection based on the state of the power system at a specific instant in time using power system data having a time component associated therewith, comprising:

a remote IED associated with a remote location on a power line, the remote IED adapted to acquire remote power system signals at a specific instant in time, and which calculates remote power system data from the acquired remote power system signals, associates the remote power system data with a time stamp corresponding to the specific instant in time to produce time-stamped remote power system data, and transmits the time-stamped remote power system data;

wherein a time delay is associated with any one of the acquisition of the power system signals, the calculation of remote power system data or the transmission of the time-stamped power system data; and

a local IED associated with a location on a power line, the local IED adapted to acquire local power system signals at the specific instant in time, and which calculates local power system data from the acquired local power system signals, receives the time-stamped remote power system data, associates the local power system data with a time stamp corresponding to the specific instant in time to produce time-stamped local power system data, time-aligns the local power system data with the remote power system data by matching the time stamps of the local power system data with the time stamps of the remote power system data for the specific instant in time, and performs a real-time automation, control or protection operations based on the state of the power system at the specific instant in time using the time-aligned local power system data and remote power system data.

2. The system of claim 1, wherein the local IED transmits the time-stamped local power system data to the remote IED and the remote IED receives time-stamped local power system data, time-aligns the time-stamped local power system data with the time-stamped remote power system data by matching the time stamps of the local power system data with the time stamps of the remote power system data for the specific instant in time, and performs a real-time automation, control or protection operations using the time-aligned local power system data and remote power system data.

3. The system of claim 1, wherein power system data is phasor data.

4. The system of claim 1, wherein the local power system signal is voltage or current.

5. The system of claim 1, wherein the local IED further performs math operations on acquired local power system signal.

6. The system of claim 1, wherein the local IED is further adapted to provide a report containing one of the group consisting of:

a configuration of the remote IED, a data status indicator, data, a channel latency, and combinations thereof.

7. The system of claim 1, wherein the remote IED is further adapted to transmit to the local IED power system information selected from a group consisting of IED configuration settings, substation configuration, and combinations thereof.

8. The system of claim 1, wherein the local IED is further adapted to provide a synchronized phasor measurement report containing one selected from the group consisting of:

a time stamp, local power system data at the time of the time stamp, remote power system data at the time of the time stamp, power system frequency at the time of the time stamp, and combinations thereof.

9. The system of claim 1, wherein the local IED time delays the local power system data to account for latencies in communication of the remote power system data to the local IED.

10. A method for providing protection, control and monitoring to an electric power system based on the state of the power system at a specific instant in time, the method comprising the steps of:

acquiring remote power system signals at remote locations at the specific instant in time;

calculating remote power system data from the acquired remote power system signals;

associating the remote power system data with a time value corresponding to the specific instant in time to produce time-stamped remote power system data;

transmitting the time-stamped remote power system data to a local location;

wherein a time delay is associated with any one of the acquiring, calculating, associating or transmitting steps;

receiving the time-stamped remote power system data at the local location;

acquiring local power system signals;

calculating local power system data from the sampled local power system signals;

associating the local power system data with a time value corresponding to the specific instant in time to produce time-stamped local power system data;

time-aligning the time-stamped local power system data with the time-stamped remote power system data for the specific instant in time by matching the time-stamps of the local power system data with the time-stamps of the remote power system data for the specific instant in time; and

performing real-time automation, protection or control functions based on the state of the power system at the specific instant in time using the time-aligned local power system data and remote power system data.

11. The method of claim 10, further comprising the step of:

transmitting the time-stamped local power system data to the remote location.

12. The method of claim 10, wherein power system data is phasor data.

13. The method of claim 10, further comprising the step of time delaying the local power system data to account for latencies in transmitting the time-stamped remote power system data to the local location.

14. The method of claim 10, wherein the local power system signals are voltage or current signals.

15. The method of claim 10, further comprising the step of performing math operations on the acquired local power system signals.

16. The method of claim 15, wherein the math operations are user-defined.

17. An apparatus for providing protection, monitoring and control for an electric power system based on the state of the power system at a specific instant in time, the apparatus comprising:

an acquisition circuit for obtaining local analog signals from an electric power system at a specific instant in time;

a sampling circuit for sampling the local analog signals;

a communication channel for transmitting messages containing local power system data calculated from the local analog signals to a remote device;

a communication channel for receiving messages containing remote power system data for the specific instant in time from the remote device;

wherein a time delay is associated with any one of the obtaining, sampling or communication of power system data;

a time alignment function for time aligning the local power system data with the remote power system data for the specific instant in time, and

a real-time operation function for providing protection, automation, metering, or control of the power system based on the time aligned local power system data and remote power system data.

18. The apparatus of claim 17, wherein the power system data is phasor data.

19. The apparatus of claim 17, further comprising a microcontroller for performing math operations on sampled local power system signals.

20. The apparatus of claim 19, wherein the math operations are user-defined.

21. The apparatus of claim 17, further comprising a time delay to delay the local power system data to account for latencies in the communication channel.

22. The apparatus of claim 17, wherein the apparatus associates the local power system data with a time stamp to produce time-stamped local power system data, and transmits the time-stamped local power system data to another apparatus.

23. A system for power system automation, control or protection based on the state of the power system at a specific instant in time using power system data having a time component associated therewith, comprising:

a plurality of IEDs associated with locations on a power line, the plurality of IEDs adapted to acquire power system signals at a specific instant in time, and which calculate power system data from the acquired power system signals for the specific instant in time, associate the power system data with a time stamp corresponding to the specific instant in time to produce time-stamped power system data, and transmit the time-stamped power system data;

wherein one of the IEDs has a time delay associated therewith; and

a real-time controller adapted to receive the time-stamped power system data from the plurality of IEDs, time-aligns the time-stamped power system data for the specific instant in time by matching the time stamps of the IEDs for the specific instant in time, performs a real-time automation, control or protection operations based on the state of the power system at the specific instant in time using the time-aligned power system data, and transmits messages associated with results of the automation, control or protection operations to at least one of the plurality of IEDs.

24. The system of claim 23, wherein the power system data is synchrophasor data.