A dynamic phasor estimation algorithm based on angle-shifted energy operator  

作　　者：JIN XiaNing WANG FuPing WANG ZanJi 

机构地区：[1]State Key Laboratory of Power System,Department of Electrical Engineering,Tsinghua University

出　　处：《Science China(Technological Sciences)》2013年第6期1322-1329,共8页中国科学（技术科学英文版）

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20090002110040)

摘　　要：Under dynamic conditions, the signals of power system have time-varying magnitude and frequency, which might lead to considerable errors for synchrophasor measurement. The traditional discrete Fourier transform (DFT) based algorithms used in Phasor Measurement Unit (PMU) are hard to meet the requirements of measurement accuracy because of the existence of spectral leakage. A dynamic phasor measurement algorithm is proposed in this paper in which the input sampled data are considered as non-stationary signals with amplitude modulation-frequency modulation (AM-FM) form, and the measurement is achieved by AM-FM demodulation. An angle-shifted energy operator (ASEO) is used to extract the instantaneous amplitude and low pass differential filter is introduced for frequency estimation. Simulation results indicate that the proposed algorithm can effectively improve the phasor measurement accuracy and has very short response time for PMU under dynamic conditions.

关 键 词：synchronous phasor measurement discrete Fourier transform （DFT） dynamic conditions energy operator 

分 类 号：TM930[电气工程—电力电子与电力传动]