基于多端行波时差的配电网故障定位方法  

Fault location method for distribution networks based on traveling wave time difference

作　　者：李练兵 孙腾达 曾四鸣 王磊 梁纪峰 郝育红 LI Lianbing;SUN Tengda;ZENG Siming;WANG Lei;LIANG Jifeng;HAO Yuhong(School of Artificial Intelligence and Data Science,Hebei University of Technology,Tianjin 300401,China;State Grid Hebei Electric Power Co.,Ltd.Research Institute,Shijiazhuang 050021,China;Jizhong Energy Fengfeng Group Co.,Ltd.,Handan 056107,China)

机构地区：[1]河北工业大学人工智能与数据科学学院,天津300401 [2]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [3]冀中能源峰峰集团有限公司,河北邯郸056107

出　　处：《电力系统保护与控制》2022年第3期140-147,共8页Power System Protection and Control

基　　金：河北省省级科技计划项目资助(20314301D);国网河北能源技术服务有限公司科技项目资助(SGHEJS00JYJS2000295)。

摘　　要：针对现有配电网故障定位方法存在实现复杂、可靠性不高的问题,提出一种基于多端行波时差的配电网故障定位方法。首先,分析故障行波传输特性,提出一种配电网故障状态表达式。根据多端行波时差和双端行波原理计算故障距离理论值。将理论值代入故障状态表达式,搭建故障搜索矩阵和辅助矩阵,通过分析矩阵元素变化特征和数值状态定位故障线路。然后,根据三端行波法计算实际故障距离,消除行波波速不确定性造成的测距误差。最后,在Matlab/Simulink中建立配电网故障模型,验证在不同的故障类型和过渡电阻下定位方法的有效性。仿真结果表明定位方法可靠性好、准确度高。There are problems of complex implementation and low reliability in the existing fault location methods of a distribution network.Thus a fault location method based on multi-terminal traveling wave time difference is proposed.First,by analyzing the transmission characteristics of a fault traveling wave,a fault state expression of the distribution network is proposed.The theoretical value of the fault distance is calculated.The fault search and auxiliary matrices are built,and the change characteristics and numerical status of the matrix elements are analyzed to locate the fault line.Then the actual fault distance is calculated according to the three-terminal traveling wave method,and the influence of traveling wave velocity is eliminated.Finally,the distribution network fault model is established in Matlab/Simulink to verify the effectiveness of the location method under different fault types and transition resistances.The simulation results show that the location method has good reliability and high accuracy.

关 键 词：配电网 故障搜索矩阵 辅助矩阵 故障定位 行波测距 

分 类 号：TM727[电气工程—电力系统及自动化]