摘要
针对谐振接地配电网单相接地故障时定位困难的问题,着眼柔性开关设备(soft open point,SOP)投入改造交流配网的发展趋势,提出一种基于SOP附加三相对称低频电压的主动式故障区段定位新方法。该方法利用消弧线圈对低频外加信号的过补偿作用,凸显了故障点与消弧线圈安装处的电感电流流通回路。根据低频网络中电感电流与电容电流的固有幅值比,形成自适应判据实现故障区段的有效判定。所提方法原理简单,不受过渡电阻、系统运行方式以及线路长度影响,可靠性较高。PSCAD仿真结果表明该方法的正确性和可行性。
Aiming at the difficulty of locating single phase grounding faults in the resonant grounding distribution network,considering that the application of the soft open point(SOP)in the AC distribution network is a development trend,this paper proposed an active fault locating method,by generating an additional three-phase symmetrical voltage of low frequency based on SOP.Due to the over compensating effect of the arc suppression coil under the additional low-frequency signal,this method can highlight the inductive current’s circulating path between the fault point and the arc suppression coil.According to the inherent amplitude ratio of the inductance current to the capacitive current in the low-frequency network,an adaptive criterion was formed to achieve an effective judgement of the fault section.This method will not be affected by transition resistances,system operation modes or line lengths,thus has high reliability.PSCAD simulation results demonstrated the correctness and feasibility of the method.
作者
叶雨晴
马啸
林湘宁
李正天
许烽
王朝亮
倪晓军
丁超
YE Yuqing;MA Xiao;LIN Xiangning;LI Zhengtian;XU Feng;WANG Chaoliang;NI Xiaojun;DING Chao(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第5期1453-1465,共13页
Proceedings of the CSEE
基金
国家重点研发计划(2017YFB0903100)
国家电网公司科技项目(521104170043).
关键词
谐振接地配电网
单相接地故障
主动式故障定位方法
柔性开关设备
改进故障指示器
resonant grounding distribution network
single phase grounding fault
active fault locating method
soft open point
modified fault indicator
作者简介
叶雨晴(1996),女,硕士研究生,主要从事交直流互联系统分析和保护的研究工作,389050816@qq.com;通信作者:马啸(1995),男,博士研究生,主要从事电力系统保护与控制方面的研究工作,1815708181@qq.com;林湘宁(1970),男,教授,博士生导师,主要研究方向为新能源微网规划运行和电力系统继电保护与控制,xiangning.lin@hust.edu.cn。
