Method and component for voltage instability protection in an electric power system
First Claim
1. A method of protecting an electric power system against voltage instability, the method comprising:
- determining a change in power injected into a region of interest within the electric power system based on synchronized power measurements from different power injection points of the region of interest;
determining a change in power absorbed by one or more loads in the region of interest based on synchronized power measurements from different load points of the region of interest;
determining a change in power loss for the region of interest based on the difference between the change in power injected into the region of interest and the change in power absorbed by the region of interest;
indicating a voltage instability condition when the change in power loss for the region of interest approximates the change in power injected into the region of interest; and
controlling one or more protective devices based on determining the voltage instability.
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Accused Products
Abstract
Voltage instability protection for an electric power system is implemented by determining a change in power injected into a region of interest within the electric power system based on synchronized power measurements from different power injection points of the region of interest, and by determining a change in power absorbed by one or more loads in the region of interest based on synchronized power measurements from different load points of the region of interest. A change in power loss for the region of interest is determined based on the difference between the change in power injected into the region of interest and the change in power absorbed by the region of interest. A voltage instability condition is indicated when the change in power loss for the region of interest approximates the change in power injected into the region of interest.
11 Citations
20 Claims
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1. A method of protecting an electric power system against voltage instability, the method comprising:
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determining a change in power injected into a region of interest within the electric power system based on synchronized power measurements from different power injection points of the region of interest; determining a change in power absorbed by one or more loads in the region of interest based on synchronized power measurements from different load points of the region of interest; determining a change in power loss for the region of interest based on the difference between the change in power injected into the region of interest and the change in power absorbed by the region of interest; indicating a voltage instability condition when the change in power loss for the region of interest approximates the change in power injected into the region of interest; and controlling one or more protective devices based on determining the voltage instability. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A component of an electric power system, comprising:
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a controller operable to; determine a change in power injected into a region of interest within the electric power system based on synchronized power measurements from different power injection points of the region of interest; determine a change in power absorbed by one or more loads in the region of interest based on synchronized power measurements from different load points of the region of interest; and determine a change in power loss for the region of interest based on the difference between the change in power injected into the region of interest and the change in power absorbed by the region of interest; and a transmitter operable to indicate a voltage instability condition when the change in power loss for the region of interest approximates the change in power injected into the region of interest; wherein the controller controls one or more protective devices based on determining the voltage instability. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification