Research on Harmonic Detection Algorithm Based on apFFT

Abstract With the improvement of train speed high-speed railway, traction power and current are increasing. In order to evaluate influence harmonic inter-harmonic on signal system, accurate detection is urgently needed. This paper proposed an algorithm based all-phase fast Fourier transform method (apFFT) realize inter-harmonic. Firstly, steady-state model constructed, continuous discrete time characteristics analysed. Secondly, basis theoretical analysis, apFFT has high amplitude accuracy phase invariance by comparing with traditional FFT method. Finally, results show that significantly improved in frequency accuracy, other algorithms.