基于沿线电压分布规律的快速故障测距

doi:10.19595/j.cnki.1000-6753.tces.161268

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摘要

针对双端工频故障测距法存在的双端数据同步困难、迭代次数多、收敛速度慢以及测距伪根难识别等关键问题,提出一种基于输电线路沿线电压分布规律的快速故障测距方法。在分布参数线路模型上,分析输电线路的沿线电压幅值分布规律。对线路进行单调分区域,在各区域取两点求切线,通过切线交叉原理进行初步故障测距。考虑到远距离输电线路非线性因素造成的测距误差,进一步采用切线交叉原理对测距结果进行迭代修正,使测距结果向实际故障点逐级逼近。经仿真验证,所提测距方法仅利用线路参数及单端测量数据计算切线,故无需双端数据同步;通过迭代能够准确去除伪根,实现精确测距;测距原理简单,迭代次数少,收敛速度快,仅需4次计算就能把故障位置锁定在300 m以内。

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	李振兴
	王新
	田斌
	李振华
	翁汉琍

关键词 ：输电线路, 故障测距, 沿线电压分布, 切线交叉, 迭代

Abstract：

In terms of power frequency component of two terminals fault location principle, there are some traditional problems,such as the synchronization difficulty on the measured data between two ends of line, the more iterative times, the slower convergence speed and the difficulty of identifying the false roots. Thus, the paper proposed a new fast fault location method based on voltage distribution regularities along transmission line. The paper analyzed the distribution of voltage amplitude along transmission line on the basis of distributed parameter line model. A transmission line is divided into several areas according to the monotonicity of voltage amplitude distribution curve under an internal fault. The tangent line can be gotten by two distributed points in each area, and the fault location can be preliminarily determined based on the tangent intersection principle. Considering the fault location error caused by the nonlinear factors of long line parameter, the tangent intersection principle is further used to adjust the location results iteratively until the fault distance successively approximate to the actual fault point. Simulation results show that the proposed fast fault location method only uses the line parameters and the measured data at the single terminal, so the method can accurately remove the false roots and achieve precision location results based on several iterations without the synchronization of the data. Also it shows that the principle of fault location is simple, the number of iterations is small, and the convergence speed is fast. The fault location can be locked within 300 meters only by the calculation of 4 times.

Key words： Transmission line fault location voltage distribution tangent intersection iteration

收稿日期: 2016-08-10 出版日期: 2018-01-16

PACS:

TM77

基金资助:

国家自然科学基金（51177056）和湖北省教育厅科学技术研究计划重点（D20171203）资助项目

作者简介: 李振兴男,1977年生,博士,副教授,研究方向为电力系统保护与控制。E-mail：lzx2007001@163.com（通信作者）王新男,1992年生,硕士研究生,研究方向为电力系统保护与控制。E-mail：1016358549@qq.com

引用本文:

李振兴, 王新, 田斌, 李振华, 翁汉琍. 基于沿线电压分布规律的快速故障测距[J]. 电工技术学报, 2018, 33(1): 112-120. Li Zhenxing, Wang Xin, Tian Bin, Li Zhenhua, Weng Hanli. A Fast Fault Location Method Based on Distribution Voltage Regularities along Transmission Line. Transactions of China Electrotechnical Society, 2018, 33(1): 112-120.

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