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

作者：Jin XiaNing^*; Wang FuPing; Wang ZanJi

来源：Science China Technological Sciences, 2013, 56(6): 1322-1329.

DOI：10.1007/s11431-013-5227-0

• synchronous phasor measurement
• discrete Fourier transform (DFT)
• dynamic conditions
• energy operator

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.

• 出版日期2013-6
• 单位清华大学