基于分裂基快速傅立叶变换的电力系统谐波分析

Power system harmonics analysis base on split-radix fast fourier transform

基于快速傅立叶变换(FFT)的电力系统谐波分析难以实现同步采样和整数周期截断,易造成频谱泄漏,影响谐波分析精度.为提高FFT的精度,比较几个典型的窗函数,提出基于加凯瑟窗的插值分裂基快速傅立叶变换算法.仿真分析结果表明该算法能提高FFT计算精度,满足谐波参数测量的精度要求.

It＇s difficult to acquire synchronous sampling and integer period truncation for power system harmonics analysis by using fast Fourier transform（FFT）.It may cause frequency spectrum leakage and harmonics analysis error.Based on the comparison of several typical window functions,an improved split-radix fast fourier transform（SRFFT）algorithm with adding Kaiser window interpolation is presented in this paper,which can improve the accuracy of FFT.Simulation results show that the algorithm can greatly improve the FFT accuracy and satisfy the harmonics measurement requirement.