Systems and methods for performing a redundancy check using intelligent electronic devices in an electric power system

• US 7,460,347 B2
• Filed: 02/01/2006
• Issued: 12/02/2008
• Est. Priority Date: 07/06/2001
• Status: Expired due to Term

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Lee, Tony J., Schweitzer, Edmund O. III, Schweitzer, Edmund A.
• Primary Examiner(s): Jackson; Stephen W
• Application Number:
  US11/345,033
• Publication Number:
  US 20060193099A1
• Time in Patent Office: 1,035 Days
• Field of Search: 361/62
• US Class Current: 361/62
• 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 3/05 with means for increasing reliability, e.g. redundancy arrangements for logic circuits H03K19/003
• 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 10/16 Electric power substations
• CPC Class Codes: Y04S 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

Abstract

Provided is an intelligent electronic device-to-intelligent electronic device direct communication system in a power system, for performing a power system data redundancy check therebetween. The communication includes a first intelligent electronic device adapted for deriving power system data from a selected portion of the power system. The first intelligent electronic device is associated with a first transmit module for transmitting the derived power system data. A second intelligent electronic device is further provided and adapted for deriving power system data from the selected portion of the power system, wherein the second intelligent electronic device is associated with a first receive module. The first receive module of the second intelligent electronic device is coupled to the first transmit module of the first intelligent electronic device via a communication link, such that the first receive module is adapted to receive the derived power system data transmitted by the first intelligent electronic device. The second intelligent electronic device is further adapted to provide a redundancy check between the first and second intelligent electronic devices by comparing the power system data derived by the second intelligent electronic device with the power system data transmitted thereto from the first intelligent electronic device. In other embodiments, the power system data transmission can be bidirectional and redundancy check can be performed in both intelligent electronic devices.

Claims

1. An intelligent electronic device-to-intelligent electronic device direct communication system in a power system, the intelligent electronic device-to-intelligent electronic device direct communication system comprising:

a first intelligent electronic device which derives power system data from a selected portion of the power system, the first intelligent electronic device being associated with a first transmit module which transmits the derived power system data; and

a second intelligent electronic device which derives power system data from the selected portion of the power system, the second intelligent electronic device being associated with a first receive module,

wherein the first receive module of the second intelligent electronic device is coupled to the first transmit module of the first intelligent electronic device via a communication link, such that the first receive module receives the derived power system data transmitted by the first intelligent electronic device, and

wherein the second intelligent electronic device provides a redundancy check between the first and second intelligent electronic devices by comparing the power system data derived by the second intelligent electronic device with the power system data transmitted thereto from the first intelligent electronic device.

2. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the first transmit module further includes a first microcontroller which provides a plurality of data channels, each of the plurality of data channels being associated with the power system data and having a variety of bit-lengths in the form of successive data stream messages.

3. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 2, wherein the first receive module further includes a second microcontroller which provides a plurality of data channels, thereby being adapted to receive the power system data having a variety of bit-lengths in the form of successive data stream messages being transmitted by the first transmit module.

4. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the first intelligent electronic device is further associated with a second receive module and the second intelligent electronic device is further associated with a second transmit module to enable bidirectional transmission.

5. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the second intelligent electronic device further comprises a comparator which compares the power system data received from the first intelligent electronic device to the power system data derived by the second intelligent electronic device, thereby providing a redundancy check between the first and second intelligent electronic devices.

6. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein at least one of the intelligent electronic devices is further associated with an alarm which signals a select condition.

7. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 6, wherein the condition for signaling is selected from the group consisting of signaling when the difference between the power system data exceeds a select value, signaling when the communication link is severed, signaling when there is a power loss in any of the intelligent electronic devices, and signaling when there is a failure in any of the intelligent electronic devices.

8. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, further comprising a monitoring apparatus which monitors one of the intelligent electronic devices.

9. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, further comprising a control apparatus which controls one of the intelligent electronic devices.

10. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 3, wherein each of the first and second intelligent electronic devices further includes a transmit and receive interface which converts between bytes of power system data bits and the plurality of serial messages transmitted via the communication link, the bytes of power system data bits corresponding to the selected power system data.

11. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 10, wherein each of the plurality of serial messages includes a number of fixed formatted characters that include the power system data bits.

12. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 10, wherein subsequent to receipt by the first receive module, each of the plurality of serial messages are decoded and parallelized to form a decoded message, sequential decoded messages re-forming the power system data.

13. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein at least one of the intelligent electronic devices includes metering functionality.

14. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the power system data is derived from the group of power system quantities consisting of watts, VARs, volt-amperes, volts, amperes, frequency, harmonics, vectors of voltages, and vectors of currents.

15. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the power system data is derived from the group of time-integrated power system quantities consisting of watt-hours, VAR-hours,volt-ampere-hours, volt-hours, and ampere-hours.

16. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the power system data is transmitted in the group of formats consisting of KYZ pulses, analog signals, parallel digital data, serial digital data, and time-synchronized digitized analog data.

17. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the communication link is a wired communication link.

18. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the communication link is a wireless communication link.

19. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, wherein the communication link is selected from the group consisting of a serial link, RF link, microwave link, audio link, infrared link, fiber optic link, channel to channel contact, fiber channel, telephone line, power line carrier, local network, wide-area network, local optical networks and Ethernet.

20. The intelligent electronic device-to-intelligent electronic device direct communication system of claim 1, further comprising a clock associated with at least one of the intelligent electronic devices, wherein the respective intelligent electronic device associated therewith is adapted to synchronize the transmitted and received selected power system data.

21. The intelligent electronic device-to-intelligent electronic device communication system of claim 3, wherein the plurality of data channels comprises eight data channels.

22. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein at least one of the intelligent electronic devices is selected from the group of intelligent electronic devices consisting of a meter, protective relay, recloser control, I/O processor and controller, communication processor, Synchrophasor and a capacitor bank controller.

23. The intelligent electronic device-to-intelligent electronic device communication system of claim 3, wherein the first receive module is further adapted to receive the successive data messages to produce replicated power system data, wherein the speed and security of the replicated power system data is approximately at least as good as that for the power system data.

24. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein the first intelligent electronic device is separate, but in communication with, the first transmit module.

25. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein the first intelligent electronic device includes the first transmit module.

26. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein the second intelligent electronic device is separate, but in communication with, the first receive module.

27. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein the second intelligent electronic device includes the first receive module.

28. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein the first intelligent electronic device derives power system data in the form of KYZ pulses, and wherein the second intelligent electronic device derives power system data in the form of time-integrated power system quantities such that the second intelligent electronic device provides a redundancy check between the first and second intelligent electronic devices by comparing the time-integrated power system quantities derived by the second intelligent electronic device with the KYZ pulses transmitted thereto from the first intelligent electronic device.

29. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein both the first and second intelligent electronic devices derive power system data in the form of KYZ pulses such that the second intelligent electronic device provides a redundancy check between the first and second intelligent electronic devices by comparing the KYZ pulses derived by the second intelligent electronic device with the KYZ pulses transmitted thereto from the first intelligent electronic device.

30. The intelligent electronic device-to-intelligent electronic device communication system of claim 1, wherein both the first and second intelligent electronic devices derive power system data in the form of time-integrated power system quantities such that the second intelligent electronic device provides a redundancy check between the first and second intelligent electronic devices by comparing the time-integrated power system quantities derived by the second intelligent electronic device with the time-integrated power system quantities transmitted thereto from the first intelligent electronic device.

31. A first intelligent electronic device for use in an intelligent electronic device-to-intelligent electronic device direct communication system in a power system, wherein the intelligent electronic device-to-intelligent electronic device direct communication system includes a second intelligent electronic device associated with a first receive module including a first microcontroller which provides a plurality of data channels, each of the plurality of data channels associated with power system data having a variety of bit-lengths in the form of successive data stream messages, the first receive module further receiving the power system data transmitted thereto, the first intelligent electronic device comprising:

a first transmit module including a second microcontroller which provides the plurality of data channels, each of the plurality of data channels associated with power system data having a variety of bit-lengths in the form of successive data stream messages, wherein the first transmit module transmits channel data to the second intelligent electronic device, thereby providing a redundancy check between the first and second intelligent electronic devices.

32. The first intelligent electronic device of claim 31, further comprising a second receive module which receives transmitted power system data.

33. The first intelligent electronic device of claim 32, further comprising a comparator which compares the received power system data to the transmitted power system data.

34. The first intelligent electronic device of claim 33, further comprising an alarm which signals when the difference between the received and transmitted power system data exceeds a selected value or range.

35. The first intelligent electronic device of claim 31, further comprising a clock, wherein the second microcontroller associated therewith is adapted to synchronize the transmitted and received selected power system data.

36. The first intelligent electronic device of claim 31, wherein said intelligent electronic device is selected from the group of intelligent electronic devices consisting of a meter, protective relay, recloser control, I/O processor and controller, communication processor, Synchrophasor and a capacitor bank controller.

37. A secondary intelligent electronic device for use in an intelligent electronic device-to-intelligent electronic device direct communication system in a power system, wherein the intelligent electronic device-to-intelligent electronic device direct communication system includes a first intelligent electronic device which derives power system data from a selected portion of the power system, the first intelligent electronic device being associated with a transmit module which transmits the derived power system data, the secondary intelligent electronic device comprising:

a device which derives power system data from the selected portion of the power system,

a receive module which receives the power system data transmitted by the first transmit module of the first intelligent electronic device,

a comparator coupled to the receive module and the device which derives power system data, wherein the comparator compares the power system data derived by the sampling instrument with the power system data received from the first intelligent electronic device, thereby providing a redundancy check between the first and secondary intelligent electronic devices.

38. The secondary intelligent electronic device of claim 37, wherein the receive module further includes a microcontroller which provides a plurality of data channels, each of the plurality of data channels associated with the power system data and having a variety of bit-lengths in the form of successive data stream messages.

39. The secondary intelligent electronic device of claim 37, further comprising a transmit module which transmits the power system data derived by the sampling instrument.

40. The secondary intelligent electronic device of claim 39, wherein the transmit module of the secondary intelligent electronic device further includes a microcontroller which provides a plurality of data channels, each of the plurality of data channels associated with the power system data and having a variety of bit-lengths in the form of successive data stream messages.

41. The secondary intelligent electronic device of claim 37, further comprising an alarm which signals when the difference between the power system data received from the first intelligent electronic device and the power system data derived by the secondary intelligent electronic device exceeds a selected value or range.

42. The secondary intelligent electronic device of claim 37, further comprising a clock synchronize the transmitted and received selected power system data.

43. The secondary intelligent electronic device of claim 37, wherein the secondary intelligent electronic device is selected from the group of intelligent electronic devices consisting of a meter, protective relay, recloser control, I/O processor and controller, communication processor, Synchrophasor and a capacitor bank controller.

44. The secondary intelligent electronic device of claim 37, wherein the receive module is further receives the successive data messages to produce replicated power system data, wherein the speed and security of the replicated power system data is approximately at least as good as that for the power system data.

45. A method of performing a redundancy check between a first intelligent electronic device and a second intelligent electronic device, the method comprising the steps of:

deriving power system data from a selected portion of a power system using the first intelligent electronic device;

transmitting, via a communication link, the power system data from the first intelligent electronic device to the second intelligent electronic device;

receiving the power system data from the first intelligent electronic device using the second intelligent electronic device;

deriving power system data from the selected portion of the power system using the second intelligent electronic device; and

comparing, via a comparator in the second intelligent electronic device, the power system data by the second intelligent electronic device with the power system data transmitted by the first intelligent electronic device.

46. The method of performing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the power system data is transmitted from the first intelligent electronic device to the second intelligent electronic device via successive data stream messages.

47. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, further comprising the step of signaling an alarm if the difference of the power system data by the second intelligent electronic device and the power system data transmitted by the first intelligent electronic device exceeds a selected value or range.

48. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein at least one of the intelligent electronic devices is selected from the group of intelligent electronic devices consisting of a meter, protective relay, recloser control, I/O processor and controller, communication processor, Synchrophasor and a capacitor bank controller.

49. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 46, further comprising decoding the data stream messages.

50. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the power system data is selected from the group of power system quantities consisting of watts, VARs, volt-amperes, volts, amperes, frequency, hannonics, vectors of voltages, and vectors of currents.

51. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the power system data is selected from the group of time-integrated power system quantities consisting of Watt-hours, VAR-hours, volt-ampere-hours, volt-hours, and ampere-hours.

52. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the power system data is transmitted in the group of formats consisting of KYZ pulses, analog signals, parallel digital data, serial digital data, and time-synchronized digitized analog data.

53. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the communication link is selected from the group consisting of a serial link, RF link, microwave link, audio link, infrared link, fiber optic link, channel to channel contact, fiber channel, telephone line, power line carrier, local network, wide-area network, local optical networks and Ethernet.

54. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein the first and second intelligent electronic devices are substantially similar in functions to enable bi-directional transmission and receiving of power system data.

55. The method of providing a redundancy check between a first intelligent electronic device and a second intelligent electronic device of claim 45, wherein respective additional intelligent electronic devices can communicate to the second intelligent electronic device to perform respective redundancy checks.