A New Strategy for Power System Harmonic Analysis Based on N=L×10M-Point DFT

This paper introduces a new strategy for power systems harmonics analysis based on N=L×10^M-point DFTs. When the fundamental frequency of a power system signal is 50 Hz, a sampling frequency 2000 Hz is selected, N=L×10^M-point DFTs can reduce spectral leakage and obtain high accuracy harmonic parameters. The simulation results in MATLAB show that the strategy are feasible, and comparing with the harmonic analysis method based N=2^M-point DFTs in radix-2 or radix-4 FFT algorithm, the harmonic analysis method based N=L×10^M-point DFTs has the obvious superiority. This new strategy maybe open up a new ideas for power system harmonic analysis.