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The Design of UFR with Fast Frequency Measurement Technique  

Park, Jong-Chan (오산대학 전기시스템제어과)
Kim, Byung-Jin (현대중공업(주) 기전연구소)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.55, no.1, 2006 , pp. 1-5 More about this Journal
Abstract
In this paper, the frequency estimator and DFT filter gain compensation for UFR(Under Frequency protection Relay) is introduced. Due to the sudden appearance of generator loads or faults in power system, the frequency is supposed to deviate from its nominal value. Because a frequency calculation is based on phase information, it needs sufficient sampling data to figure out a precious frequency. Therefore the frequency measurement for UFR needs excellent qualities such as high speed and precision with low sampling frequency Authors propose the frequency estimator which compares the vector differences and the DFT filter gain compensation which identifies DFT filter error and correct it. Using the frequency estimator and compensation, UFR which has the 0.01[ms] calculation delay and 0.003[Hz] measurement error is implemented with digital processor.
Keywords
DFT Filter; UFR(Under Frequency protection Relay);
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  • Reference
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