引用本文:钱佳琪,叶佳卓,旷哲,等.基于S变换的多端输电网故障定位方法[J].电力系统保护与控制,2014,42(23):82-88.
QIAN Jia-qi,YE Jia-zhuo,KUANG Zhe,et al.A fault-location method for multi-terminal transmission network based on S transform[J].Power System Protection and Control,2014,42(23):82-88
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基于S变换的多端输电网故障定位方法
钱佳琪1, 叶佳卓1, 旷哲1, 谭阳红1, 陈希华2
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
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。
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
DOI：10.7667/j.issn.1674-3415.2014.23.013
分类号:
基金项目:国家自然科学基金项目(61102039)
A fault-location method for multi-terminal transmission network based on S transform
QIAN Jia-qi1, YE Jia-zhuo1, KUANG Zhe1, TAN Yang-hong1, CHEN Xi-hua2
1.College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;2.Changsha Electrical Power Bureau, Hunan Eletcric Power Company, Changsha 410015, China
Abstract:
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.
Key words:  fault location  multi-terminal transmission network  S-transform  traveling wave front  double-terminal traveling wave theory
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