一种加Nuttall窗三谱线插值FFT谐波检测算法

A Nuttall window three spectral line interpolation FFT harmonic detection algorithm

为获取电网中的谐波量的精准估测,给出采用Nuttall窗体模式的FFT方法。为获取波形的突变部分,采用小波变化检测数据的暂态状况。为判断方法的性能,选取MATLAB进行仿真实验,结果表明检测所得的幅值和相位结果较为精确,并且得到拟合层级仅作用于基波检测结果。

In order to obtain the accurate estimation of harmonics in power system, this paper presents the FFT method using Nut- tall forms. In order to obtain the abrupt change of waveform, the wavelet transform is used to detect the transient state of the data. In order to judge the performance of this method, we select MATLAB to simulate the experiment. The results show that the ampli- tude and phase of the test results are more accurate, and the fitting level is only the result of fundamental wave detection.