A Power System Harmonic Detection Method Based on Fractional Wavelet Transform
Aiming at the problem that detection of stationary and transient harmonics is easily disturbed by noise,a harmonic detection method for power system based on fractional wavelet transform(FRWT)is proposed.First,the frequency of each spectrum is detected by fast Fourier transform(FFT),and the decomposition level is determined according to the frequency.Then,FRWT is used to decompose and reconstruct the signal,and the fundamental wave and each harmonic component in the signal are separated.Finally,Hilbert transform(HT)is performed on each harmonic component to obtain the frequency and amplitude detection results of each component and the start-end time of transient disturbance.The simulation results of various harmonic signals show that FRWT method can effectively detect the steady-state and transient harmonics in noisy signals and the detection accuracy of each result can be guaranteed even if the signal-to-noise ratio is low.It is proved that FRWT method is an effective new method to detect harmonics.
fractional wavelet transformwavelet transformHilberttransformharmonic detectionsimulation test
万方数据
维普
