基于CIC抽取滤波器的谐波分析算法

为消除非同步采样引起的频谱泄漏，提高电网信号的谐波分析精度，提出了基于级联积分梳状(CIC)抽取滤波器的谐波分析算法。在前端AD过采样的情况下，该算法采用逆向搜索的方法实现非同步采样数据的整周期截断，用基于CIC抽取滤波器变频的方法实现信号采样频率与信号基波频率同步，通过快速傅立叶变换(FFT)得到信号频谱，计算基波及各次谐波的幅值和相位。仿真实验结果及误差分析表明，相对于常规的分析方法，该算法具有较高的测量精度。该算法对于非稳态周期信号的谐波分析只需单周期采样，简单易实现，是一种有效的测量方法。

CIC decimation filter based algorithm of harmonic analysis

A CIC decimation filter based algorithm of harmonic analysis was proposed in order to eliminate the spectrum leakage generated by asynchronous sampling and obtain a higher accuracy of power system harmonic analysis.In the case of the preceding ADC oversampling,the integral cycles of signals were truncated by backward searching from the original asynchronous data,and the sampling frequency was synchronized with the fundamental frequency of the signal by CIC decimation filter based on frequency conversion,the...