电工技术学报  2015, Vol. 30 Issue (12): 472-479    DOI:
电力系统 |
零序分布参数的单相接地故障精确定位研究
梁睿,杨学君,薛雪,崔连华
中国矿业大学信息与电气工程学院 江苏 徐州 221116
Study of Accurate Single-phase Grounding Fault Location Based on Distributed Parameter Theory Using Data of Zero Sequence Components
Liang Rui,Yang Xuejun,Xue Xue,Cui Lianhua
School of Information and Electrical Engineering, China University of Mining & Technology Xuzhou 21008 China
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摘要 针对中性点不接地电网的单相接地故障测距问题,提出了基于故障后分布参数线路零序特征的测距方法.该方法考虑故障后零序电压,零序电流的沿线分布特征,分析零序特征作为中性点不接地系统单相接地故障点测量判据的适用性与可行性,并建立了零序特征量与故障距离的双曲函数关系表达式.为解决复平面双曲函数方程组求解困难问题,根据双曲函数的泰勒展开式,在分析传播常数数量级的基础上,将双曲函数方程合理简化为二次方程表征分布参数模型.为消除线路分布参数误差对测距结果的影响,基于加权最小二乘原理,利用非故障线路采样信息辨识故障线路零序参数,理论推导证明了其可行性.仿真结果表明,在正确选出故障馈线的基础上,该方法测距精度高,测距结果不受过渡电阻,故障距离影响.
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梁睿
杨学君
薛雪
崔连华
关键词 分布参数单相接地故障零序特征精确定位    
Abstract:Aiming at the problem of single phase grounding fault location of neutral non grounded power distribution systems, this paper presents fault location based on the zero sequence quantity characteristics in the distributed parameter line. Firstly, to analysis the characteristics of the zero sequence voltage, zero sequence current in fault line, and then discuss the applicability and reliability of fault location criterion in the non-ground neutral systems, and finally, a hyperbolic function of zero sequence characteristics and fault distance is built. In order to solve the difficulty in solving the problem of complex plane hyperbolic equation, to describe the distributed parameter model with parabolic equation instead of hyperbolic equation. In order to eliminate the influence on measurement results of the distributed parameter line error, the information from the non-fault line is used to identify the parameter of fault line based on weighted least squares, and theory proves that it is feasible. The simulation results show that, based on the right selection of the fault feeder, the method with high accuracy, measuring result is not affected by the transition resistance, fault distance.
Key wordsDistributed parameter    single-phase grounding fault    zero sequence characteristics    accurate fault location   
     出版日期: 2015-09-14
PACS: TM773  
基金资助:中国博士后科学基金(2013M531427); 中央高校基本科研业务费专项资金资助(2011QNA19)
作者简介: 梁 睿 男,1981年生,副教授,主要研究方向为电力系统自动化,供配电安全与保护.杨学君 男,1988年生,硕士研究生,研究方向为小电流接地系统的故障选线及定位.
引用本文:   
梁睿,杨学君,薛雪,崔连华. 零序分布参数的单相接地故障精确定位研究[J]. 电工技术学报, 2015, 30(12): 472-479. Liang Rui,Yang Xuejun,Xue Xue,Cui Lianhua. Study of Accurate Single-phase Grounding Fault Location Based on Distributed Parameter Theory Using Data of Zero Sequence Components. Transactions of China Electrotechnical Society, 2015, 30(12): 472-479.
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