电力系统故障暂态信号中提取基波分量的短窗积分法  

THE SHORT- WINDOW- INTEGRAL METHOD FOR CALCULATING FUNDAMENTAL COMPONENT FROM FAULT TRANSIENT SIGNALSIN POWER SYSTEMS

作　　者：孙雅明[1] 张兆宁[1] 史艳红 

机构地区：[1]天津大学电气自动化与能源工程学院,天津300072

出　　处：《电力系统自动化》2000年第1期30-33,共4页Automation of Electric Power Systems

摘　　要：提出了短窗积分提取基波分量法 ,即首先选定采样短窗及其上的一族基函数 ,由此建立积分线性方程组 ,通过解方程组得出基波分量的值 ,并给出了理论推证。经仿真并与半波傅氏、半波差分方法进行比较 ,证明了短窗积分法的优越性。与全波傅氏算法进行仿真比较 ,结果说明两者的误差相差很小 ,但短窗积分法的采样计算时间优势决定了其具有良好的实用价值。Calculating the fundamental component from fault transient signals quickly is a crux of microprocessor protective relay to operate in time.The accuracy of half- wave Fourier and half- wave differential is not good enough.The paper proposes a new short- window- integral method SWI for approximate calculation of fundamental component from fault waveforms by shortening the length of sampling windows.That is,an integral linear equation group is constructed after selecting the sampling window and a function cluster on the basis of the sampling window,and then the fundamental component can be obtained by solving the linear equation group.The correctness of the SWI method is proved.In the simulation tests,the conclusion of calculating the fundamental wave using SWI method,half- wave Fourier algorithm,half- wave differential algorithm shows the superiority of the SWI method.Besides,the calculation error of fundamental wave between the SWI method and the whole- wave Fourier algorithm is negligible,so the SWI method is more practical because of the short time of windows.

关 键 词：短窗积分法 故障暂态信号 基波分量 电力系统 

分 类 号：TM77[电气工程—电力系统及自动化]