摘要
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。己提出的基波提取算法主要有谐波分析法、暂态波形分析法。本文从谐波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性及实用性。另外，考虑到电力系统基频信号有时偏移，本文还讨论了频率偏移时对精确算法及富氏算法的影响。
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.
出处
《电力系统及其自动化学报》
CSCD
1999年第3期58-65,共8页
Proceedings of the CSU-EPSA
关键词
电力系统
故障
暂态信号
基波提取
信号分析
decaying direct current component, discrete Fourier algorithm(DFT), difference DFT, fundamental, frequency deviation
