Systems and methods for power swing and out-of-step detection using time stamped data
First Claim
1. A method for monitoring an electrical power system, comprising:
- using an intelligent electronic device to perform steps, comprising;
receiving a first voltage measurement obtained at a first location in the electrical power system;
receiving a second voltage measurement obtained at a second location in the electrical power system;
time aligning the first voltage measurement and the second voltage measurement;
calculating an angle difference between the first time aligned voltage measurement and the second time aligned voltage measurement; and
using the angle difference to monitor the electrical power system, comprising;
using the angle difference to calculate a slip frequency and an acceleration;
determining an operating point comprising the slip frequency and the acceleration;
detecting an out-of-step (OOS) condition by comparing the operating point against an OOS characteristic.
2 Assignments
0 Petitions
Accused Products
Abstract
A first intelligent electric device (IED) may be placed at a first location in an electrical power system and a second IED may be placed at a second location in the electrical power system. Voltage measurements may be received from the first and second IEDs. The measurements may be time aligned and used to calculate an angle difference between the first location and the second location in the electrical power system. A slip frequency and acceleration may be derived from the angle difference. The angle difference, slip frequency, and acceleration may be used to detect an out-of-step (OOS) condition in the electrical power system and/or a power swing between the first location and the second location in the electrical power system. The angle difference, slip frequency, and acceleration may also be used to predicatively detect OOS conditions.
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Citations
65 Claims
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1. A method for monitoring an electrical power system, comprising:
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using an intelligent electronic device to perform steps, comprising; receiving a first voltage measurement obtained at a first location in the electrical power system; receiving a second voltage measurement obtained at a second location in the electrical power system; time aligning the first voltage measurement and the second voltage measurement; calculating an angle difference between the first time aligned voltage measurement and the second time aligned voltage measurement; and using the angle difference to monitor the electrical power system, comprising; using the angle difference to calculate a slip frequency and an acceleration; determining an operating point comprising the slip frequency and the acceleration; detecting an out-of-step (OOS) condition by comparing the operating point against an OOS characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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18. The method of claim l, further comprising calculating the acceleration using the slip frequency.
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33. A system for monitoring an electrical power system comprising a first intelligent electronic device (IED) communicatively coupled to a first location in the electrical power system to obtain voltage measurements therefrom, and a second IED communicatively coupled to a second location in the electrical power system to. obtain voltage measurements therefrom, the system comprising:
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a communication module communicatively coupled to the first IED and the second IED to receive voltage measurements therefrom, wherein the communication module is configured to time align the voltage measurements received from the first IED with the voltage measurements received from the second IED; and a characterization module communicatively coupled to the communication module to calculate an angle difference between the time aligned voltage measurements received from the first IED and the second IED and to monitor the electrical power system using the angle difference by; using the angle difference to calculate a slip frequency and an acceleration; determining an operating point comprising the slip frequency and the acceleration; detecting an out-of-step (OOS) condition by comparing the operating point against an OOS characteristic. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A non-transitory computer-readable storage medium comprising instructions to cause a computing device to perform a method for monitoring an electrical power system, the method comprising:
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receiving a plurality of first voltage measurements from a first intelligent electronic device (IED) communicatively coupled to a first location in the electrical power system to obtain voltage measurements therefrom, wherein the first location is approximate to a sending-end generator equivalent of the electrical power system; receiving a plurality of second voltage measurements from a second IED communicatively coupled to a location in the electrical power system to obtain voltage measurements therefrom, wherein the second location is approximate to a receiving-end generator equivalent of the electrical power system; time aligning the first plurality of voltage measurements and the second plurality of voltage measurements; calculating an angle difference between the first time aligned voltage measurements and the second time aligned voltage measurements; calculating a slip frequency using the angle difference; calculating an acceleration using the slip frequency; detecting an out-of-step (OOS) condition in the electrical power system using the angle difference; detecting a power swing in the electrical power system using the angle difference, the slip frequency, and the acceleration; and predicatively detecting an OOS condition in the electrical power system using the slip frequency and the acceleration by; determining an operating point comprising the slip frequency and the acceleration; detecting an out-of-step (OOS) condition by comparing the operating point against an OOS characteristic. - View Dependent Claims (64, 65)
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Specification