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Power System Harmonic Detection Algorithm Based on Cosin-Window and Interpolated FFT and APFFT

HUANG Kai-hua,WANG De-ming,ZHU Zhi-yu,WEI Hai-feng,WU Jiang(Institute of Electronic Information,Jiangsu University of Science and Technology,Zhenjiang 212003,China)  
Application of the cosin-window and interpolated FFT and APFFT to harmonic analysis of power system is studied,the effect of spectrum leakage to the accuracy of the measurement is discussed.To the numerical analysis,there has high accuracy in the signal amplitude and frequency by using interpolated FFT window,but large error in phase.APFFT has the feature of phase invariance,so APFFT can get the phase exactly.As this reason,using cosin-window and interpolated FFT to detect amplitude and frequency of the signal and using APFFT to detect the phase.Simulation result demonstrates that by using the results above the estimation,accuracy of harmonic frequencies,amplitudes and phases reaches the national standards.
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