Power harmonic analysis based on all-phase FFT1

This paper based on the theory of all-phase spectrum, analysis the power harmonic signal. All-phase spectrum uses time shifting and phase retardation correction method to correct the frequency and amplitude of harmonic signal, all-phase FFT spectrum analysis and correcting has better performance by considering all complexions of the input data It´s accurately measured the harmonic´s frequency and amplitude by the theory of all-phase FFT. The accuracy of detect high harmonics is four times magnitude higher than the FFT method on the non-interference situation.