电力系统故障暂态信号分析中基波提取的新方法

电力系统故障暂态信号中基频分量的定量分析是电力系统微机保护的重要依据。已提出的基波提取算法主要有谐波分析法、暂态波形分析法。本文从谐小分析法的故障信号模型出发，给出了计算衰减直流分量的初始值和衰减率的公式，从而在滤除衰减直流分量的基础上再利用富氏算法就能得到的基频分量的精确值。在此基础上，本文又给出了精简的算法。它能在保证良好精度的基础上又满足保护快速及算法简单的要求。仿真结果证明了这些算法的有效

A NEW METHOD FOR CALCULATING FUNDAMENTAL FROM THE FAULT TRANSIENT SIGNALS IN POWER SYSTEM

The quantitative analysis about fundamental in a fault transient signals of Power System provides an important basis for microprocessor protective relay to operate accurately in Power System.There are two kinds of algorithms for calculating fundamental:harmonic analysis and transient wave analysis.This paper presents a new method to filter the decaying direct current component from the fault transient signals and obtain the accurate fundamental.Then a revised algorithm is proposed for the fast calculation and higher computation precision.According to the methods,we give lots of simulation tests and its calculation result proved the effectiveness of this method.Besides,this the analysis results of the method in this paper and discrete Fourier algorithm are given.