基于ZoomFFT和多谱线插值算法的谐波分析方法

Harmonic Analysis Method Based on ZoomFFT and Multispectral Interpolation Algorithm

基于快速傅里叶变换(Fast Fourier transform,FFT)的各种检测算法,因其具备响应速度快以及便于工程实现等特点,现已成为电能质量分析常用方法,但易造成频谱泄漏,难以精确实现多个谐波的分离检测。因此提出一种基于Blackman-Harris窗函数四谱线插值算法和复调制频谱细化算法的复合型谐波检测方法。利用改进的加窗插值算法对谐波进行检测,对于发生主瓣干扰的频谱,采用复调制频谱细化算法,实现对谐波的精确分析。仿真试验结果表明,该方法能够分辨相近谐波分量,实时性较强,能够满足电力系统对电力参数检测的需求。

Various detection algorithms based on fast Fourier transform have become a common method for power quality analysis due to their fast response speed and easy engineering implementation.It is easy to cause spectrum leakage,and difficult to accurately realize the separation and detection of multiple harmonics.A complex harmonic detection method based on the Blackman-Harris window function quadratic line interpolation algorithm and the complex modulation spectrum refinement algorithm is proposed.The improved windowed interpolation algorithm is used to detect harmonics.For the spectrum where main lobe interference occurs,the complex modulation spectrum refinement algorithm is used to analyze the harmonics accurately.The simulation results show that the method can distinguish similar harmonic components,has strong real-time performance,and can meet the needs of power system detection of power parameters.