Islanding detection in an electrical power delivery system
First Claim
1. An intelligent electronic device for detecting an islanding condition in an electrical power delivery system, comprising:
- an input for receiving a signal of the electrical power delivery system;
a processing unit configured to detect an islanding condition based on the signal, the processing unit being operable to determine from the signal a frequency deviation of electrical power delivery system from nominal frequency and a rate-of-change of frequency of the electrical power delivery system, the frequency deviation and the rate-of-change of frequency defining an operating point of the electrical power delivery system, the processing unit being operable to compare the operating point to a protection characteristic of the intelligent electronic device, wherein the processing unit is operable to issue a command based upon the comparison; and
an output in communication with the processing unit to communicate the command from the processing unit;
wherein the protection characteristic comprises a trip region that includes a frequency deviation axis and a rate-of-change of frequency axis.
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Accused Products
Abstract
An intelligent electronic device is operable to use a signal derived from an electrical power delivery system to effectively detect an islanding condition. The intelligent electronic device is configured to compare a frequency deviation (from nominal frequency) and a rate-of-change of frequency of the electrical power delivery system to a protection characteristic of the intelligent electronic device to quickly and securely detect islanding conditions thereby enhancing power protection, automation, control, and monitoring performance. The intelligent electronic device uses local measurements of the electrical power deliver system to provide reliable and economical means to properly separate a generation site from the remainder of the electrical power delivery system. Such may be useful to prevent reclosing out of synchronism.
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Citations
35 Claims
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1. An intelligent electronic device for detecting an islanding condition in an electrical power delivery system, comprising:
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an input for receiving a signal of the electrical power delivery system; a processing unit configured to detect an islanding condition based on the signal, the processing unit being operable to determine from the signal a frequency deviation of electrical power delivery system from nominal frequency and a rate-of-change of frequency of the electrical power delivery system, the frequency deviation and the rate-of-change of frequency defining an operating point of the electrical power delivery system, the processing unit being operable to compare the operating point to a protection characteristic of the intelligent electronic device, wherein the processing unit is operable to issue a command based upon the comparison; and an output in communication with the processing unit to communicate the command from the processing unit; wherein the protection characteristic comprises a trip region that includes a frequency deviation axis and a rate-of-change of frequency axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of detecting an islanding condition in an electrical power delivery system, comprising:
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receiving a signal derived from the electrical power delivery system; calculating in an intelligent electronic device a frequency deviation of the electrical power delivery system from nominal frequency based on the signal; calculating in the intelligent electronic device a rate-of-change of frequency of the electrical power delivery system based on the signal, the frequency deviation and the rate-of-change of frequency defining an operating point of the electrical power delivery system; and comparing the operating point to a protection characteristic of the intelligent electronic device to determine whether an islanding condition has occurred, wherein the protection characteristic comprises a trip region that includes a frequency deviation axis and a rate-of-change or frequency axis. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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Specification