System and method for transmitting power system data over a wide area network

• US 20060224336A1
• Filed: 04/05/2006
• Published: 10/05/2006
• Est. Priority Date: 04/05/2005
• Status: Abandoned Application

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Charles Petras
• Inventors: Anderson, James C., Fodero, Kenneth J. II, Petras, Charles E., Guzman-Casillas, Armando, Jiang, Ping
• Application Number:
  US11/399,285
• Publication Number:
  US 20060224336A1
• Time in Patent Office: Days
• US Class Current: 702/62
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

Provided is a system for transmitting synchronized phasors over a wide area network. The system generally includes a plurality of phasor measurement units (PMUs). Each of the PMUs are associated with a secured portion of a power system and measure power system data from the secured portion of the power system associated therewith. The power system data is associated with a time-element. A power system data concentrator is further provided in communication with the phasor measurement units such that it aggregates and time-correlates the power system data. A server is further provided in communication with the power system data concentrator. The server includes a program for transferring the aggregated time-correlated power system data from the secured portion of the power system to a non-secure network.

Claims

1. A system for transmitting synchronized phasors over a wide area network, comprising:

a plurality of phasor measurement units, each of said phasor measurement units associated with a secured portion of a power system and each of said phasor measurement units measuring power system data from the secured portion of the power system associated therewith, said power system data having a time element associated therewith,

power system data concentrator in communication with the phasor measurement units, said power system data concentrator aggregating and time-correlating the power system data, and

a server in communication with the power system data concentrator, said server including a program for transferring the aggregated time-correlated power system data from the secured portion of the power system to an non-secure network.

2. The system of claim 1 wherein each of the secured portions of the power system are located in a same power system grid, thereby each of the phasor measurement units being associated with the same power system grid.

3. The system of claim 1 wherein each of the secured portions of the power system are located in different power system grids, thereby each of the phasor measurement units being associated with different power system grids.

4. The system of claim 1 wherein the power system data is associated with a time element using a high-accuracy clock communicating with each of the phasor measurement units.

5. The system of claim 4 wherein the high-accuracy clock is synchronized to a global positioning system.

6. The system of claim 1 wherein the power system data is selected from a group consisting of phasors, synchronized phasors, frequency, voltage magnitude and angle, current magnitude and angle, change in frequency over time, digital values, analog scalar quantities, values derived from power system quantities, and values derived from power system status.

7. The system of claim 1 wherein the non-secure network is the internet.

8. The system of claim 1 wherein the server further comprises a firewall for providing security between the secured portion of the power system and the non-secure network.

9. The system of claim 1 wherein the server further comprises a virtual private network between the phasor measurement units and the power system data concentrator.

10. The system of claim 1 wherein the server stores historical power system data.

11. The system of claim 10 wherein the historical power system data provides trend power system data.

12. The system of claim 1 wherein the program for transferring the aggregated time-correlated power system data from the secured portion of the power system to the user accessible network further comprises a buffer.

13. The system of claim 1 wherein the program for transferring the aggregated time-correlated power system data from the secured portion of the power system to a user accessible network is a perl script program.

14. The system of claim 1 wherein the server includes a program for graphically depicting the power system data.

15. The system of claim 14 wherein the server includes an applet including the graphical depiction of the power system data.

16. The system of claim 1 wherein the secured portions of the power system are graphically depicted on a map and the power system data is graphically displayed therewith.

17. The system of claim 1 wherein the server includes a java applet for providing real-time depiction of power system data.

18. The system of claim 1 further comprising a database in communication with the power system data concentrator for storing the power system data therein.

19. The system of claim 1 further comprising a subscription management unit in communication with the server.

20. A method for transmitting synchronized phasors over a wide area network, comprising the steps of:

measuring power system data for a secured portion of a power system, said power system data being associated with a time element;

time-correlating the power system data,

aggregating the time-correlated power system data, and

transferring the aggregated time-correlated power system data from the secured portion of the power system to a user accessible network.

21. The method of claim 20 wherein the power system data is selected from a group consisting of phasors, synchronized phasors, frequency, voltage magnitude and angle, current magnitude and angle, change in frequency over time, digital values, analog scalar quantities and values derived from power system quantities.

22. The method of claim 20 wherein the user accessible network is the internet.

23. The method of claim 20 further including securing the communication between the secured portion of the power system and the user accessible network.

24. The method of claim 20 further including buffering the power system data during the transferring of aggregated time-correlated power system data from the secured portion of the power system to the user accessible network further.

25. The method claim 20 further including graphically depicting the power system data.

26. The method claim 25 further including graphically depicting the secured portions of the power system on a map.