基于FDMS的FFT电力谐波分析算法研究

Errors caused by spectral leakage and picket fence effect can be reduced by the windowed interpolation FFT algorithm in the electric power harmonic analysis. In this paper, the spectral characteristics of fast decay and minimize sidelobe window (FDMS window) were analyzed and the interpolation FFT algorithms for electrical harmonic analysis based on the FDMS window were proposed. The applicable formulas of the interpolation were obtained by using polynomial curve fit functions, and subsequently calculating burden was dramatically reduced. The simulation results indicate that, with non-synchronized sampling and non-integral period truncation, the proposed method gave the accurate results for weak harmonic extraction and complicate harmonic analysis.