Power Harmonic Detection Method Based on Dual HSMW Window FFT/apFFT Comprehensive Phase Difference

Aiming at the use of traditional Fourier transform (FFT) for harmonic detection, due to non-synchronous sampling and non-integral period truncation, which will affect the calculation accuracy of each harmonic, this paper proposes a dual Hanning self-multiplication window (HSMW) and FFT/apFFT integrated phase difference power harmonic detection method. The algorithm combines the traditional FFT and apFFT phase difference method, which has the advantage that the amplitude and phase can be obtained by accessing only one spectral line. At the same time, a dual HSMW window is designed to suppress spectral leakage. The simulation comparison experiment with traditional FFT spectrum analysis and dual Hanning window FFT/apFFT integrated phase difference method verifies the effectiveness and stability of the algorithm proposed in this paper.