基于迭代思想的同杆双回线单相接地故障定位方法  

Single Phase Grounding Fault Location Method for Double Circuit Lines on the Same Tower Based on Iteration Thought

作　　者：徐明阳 刘益青[1] 邢志超 薛嘉慧 朱一鸣 XU Mingyang;LIU Yiqing;XING Zhichao;XUE Jiahui;ZHU Yiming(School of Electrical Engineering,University of Jinan,Jinan 250022,China;Integrated Electronic Systems Lab Co.,Ltd.,Jinan 250100,China)

机构地区：[1]济南大学自动化与电气工程学院,山东济南250022 [2]积成电子股份有限公司,山东济南250100

出　　处：《山东电力技术》2021年第10期40-47,共8页Shandong Electric Power

基　　金：国家自然科学基金项目(52077124);山东省重点研发计划项目“基于阻抗特征的新能源微电网继电保护关键技术研发”(2019GGX103014)。

摘　　要：同杆双回线间存在较强电磁耦合,特别是零序互感大,使得单间隔配置的线路接地距离保护的故障定位误差较大。现有不直接采集邻线电压电流,而是估算邻线零序电流的方法,不能从根本上消除邻线零序互感的影响,接地距离保护的故障定位误差难以进一步降低。为此,提出了一种基于牛顿迭代思想的同杆双回线单相接地故障定位方法。该方法利用牛顿迭代法来提高相邻回线零序电流的估算精度,仅利用单回线电气量就能准确地完成接地距离保护的故障定位。数字仿真结果表明,所提算法在迭代过程中收敛速度快,仅利用单回线电气量就可以消除零序互感的影响,提高了单间隔配置线路接地距离保护的故障定位性能。There is strong electromagnetic coupling between double circuit lines on the same tower,especially the large zero sequence mutual inductance,which makes the fault location error of line grounding distance protection with single interval configuration larger.The existing method of estimating the zero sequence current of adjacent lines instead of directly collecting the voltage and current of adjacent lines can not fundamentally eliminate the influence of zero sequence mutual inductance of adjacent lines,and it is difficult to further reduce the fault location error of grounding distance protection.A single phase grounding fault location method for double circuit lines on the same tower based on Newton iteration thought was proposed.Newton iterative method was used to improve the estimation accuracy of zero sequence current of adjacent lines,and the fault location of grounding distance protection could be accurately completed only by using the electrical quantity of single line.Digital simulation results show that the proposed algorithm converges fast in the iterative process,and the influence of zero sequence mutual inductance can be eliminated only by using the electrical quantity of single circuit line,which improves the fault location performance of single interval configuration line to ground distance protection.

关 键 词：同杆双回线 故障定位 单相接地故障 牛顿迭代 零序互感 

分 类 号：TM773[电气工程—电力系统及自动化]