微机保护中滤除衰减直流分量的全周波傅氏算法的仿真比较分析

Simulation and analysis of full-cycle fourier algorithm for removing decaying DC component in microprocessor-based protection

传统的全周波傅氏算法无法滤除故障信号中衰减的直流分量,从而对所需信号的幅值与相位计算造成误差。对近年来提出的几种改进傅氏算法进行分类研究,着重分析了其滤除衰减直流分量的方法。通过仿真,比较和评价改进傅氏算法的滤波性能。

Traditional full-cycle algorithm can not filter decaying DC component in fault signals, it makes deviation in magnitude and phase calculation. This paper studies several sorts of improved Fourier algorithm in recent years, particularly analyzes the method of filtering decaying DC component. With the simulation result, the paper compares and evaluates the filtering capability of these improved algorithms.