一种滤除衰减直流分量的保护算法

A Protection Algorithm of Filtering Decaying DC Component

当输入信号中含有衰减直流分量时,基于周期函数模型的全波傅里叶算法会产生较大误差。针对该问题,提出了一种改进的全波傅里叶算法。该算法不需要增加采样点数,只需对采样序列进行奇偶分列并分别进行傅里叶计算,即可得到各周期分量的精确计算公式。仿真结果表明,该算法计算简单、数据窗短,可有效地消除衰减直流分量的影响。

When input signal contains decaying DC component,full-wave Fourier algorithm based on periodic function will lead to larger error.To solve the problem,the paper proposed an improved algorithm based on full-wave Fourier algorithm.The algorithm needn＇t increase sampling numbers,only need divide even or odd of sample sequence and makes Fourier calculation respectively,then accurate formula for each periodic component can be obtained.The simulation result showed that the algorithm has simple calculation and short data window,which can eliminate effect of decaying DC component effectively.