基于S变换的多端输电网故障定位方法  

A fault-location method for multi-terminal transmission network based on S transform

作　　者：钱佳琪[1] 叶佳卓[1] 旷哲 谭阳红[1] 陈希华[2] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]湖南省电力公司长沙电业局,湖南长沙410015

出　　处：《电力系统保护与控制》2014年第23期82-88,共7页Power System Protection and Control

基　　金：国家自然科学基金项目(61102039)~~

摘　　要：针对现有对于多端输电线路故障定位方法研究的不足,提出了一种基于暂态行波的多端输电网故障定位新方法。对各检测端母线电压线模分量应用S变换,从中提取出奈奎斯特频率分量单频率行波的幅-时变化特性,幅值最大值对应的时刻即为行波波首的到达时刻。采用该频率分量对应的行波波速作为计算用波速,解决了波速不确定的问题。将多端输电网看作含有一条干路和若干支路的集合,形成从支路到干路逐一排除的故障定段方案。最后,依定段结果与双端测距原理计算出故障点准确位置。仿真分析结果表明,定位精确、可靠,算法抗噪性及适应性强。To improve the existing fault location methods in multi-terminal transmission network, a novel method based on transient traveling wave is presented. S-transform is applied to the aerial modal components of synchronized measured voltages at all the terminals to extract the Nyquist frequency components of transient traveling waves. The moment corresponding to the maximum component in the Nyquist frequency component is exactly the initial traveling wave arrival time. Using the wave velocity corresponding to the Nyquist frequency component as the calculation wave velocity, the problem of the wave speed uncertainty is solved. According to the number of T nodes passed through by each line, all the lines can be classified into branch section and artery section. Based on double-terminal traveling wave theory and the result of the indentification theory for fault section, the final fault distance can be achieved. The simulation results prove good performance of the proposed method.

关 键 词：故障定位 多端输电网 S变换 行波波头 双端行波原理 

分 类 号：TM73[电气工程—电力系统及自动化]