基于FFT和小波变换的谐波分析策略

有源电力滤波器是一种用于动态抑制谐波、补偿无功的新型电力电子装置,它能够对大小和频率都变化的谐波以及变化的无功进行补偿。该文提出了FFT变换与小波变换相结合的检测电路,小波变换分析将信号分成了稳态部分及非稳态部分,稳态部分采用傅里叶变换,非稳态部分采取模极大值分析。利用Matlab对其仿真很好的验证了该方法是可行的,可有效滤除谐波。

The harmonic analysis strategy based on FFT and wavelet transform

APF is a new power electronic devices that can suppress harmonics dynamic and compen-sate reactive power . It also can compensate the harmonics on the size and frequency of change and reac-tive power of change. In this paper, FFT transform and wavelet transform combined detection circuit, wavelet transform analysis divides the signal into a steady-state and non-steady-state part, steady-state part use the Fourier transform, non-steady-state use modulus maxima analysis. Using Matlab we conclude the method is feasible and can effectively filter out harmonics.