一种完全滤除衰减直流分量的短数据窗改进全波傅氏算法

An improved short data window full-wave Fourier algorithm for completely filtering decaying DC component

计算机继电保护中的全波傅氏算法是基于周期函数模型推导出来的。当输入信号中含有衰减直流分量而不再是周期函数时,全波傅氏算法有较大的误差。该文提出了一种改进算法,不需要增加采样点数,就能在未知衰减时间常数的情况下对衰减直流分量进行补偿,理论上能完全滤除衰减直流分量。

The full-wave Fourier algorithm used in computer-based relay protection is derived with periodic function model. But when the input signal is no longer the periodic function for the existing of DC component, the full-wave Fourier algorithm will have higher error. An improved algorithm is proposed in this paper, which can compensate the decaying DC component and completely filter it theoretically, without knowing the decaying time constant or adding sample point.