Multi-Branch Fault Line Location Method Based on Time Difference Matrix Fitting  

作　　者：Hua Leng Silin He Jian Qiu Feng Liu Xinfei Huang Jiran Zhu 

机构地区：[1]School of Electrical and Information Engineering,Hunan University,Changsha,410082,China [2]Distribution Network Technical Center,State Grid Hunan Electric Power Research Institute,Changsha,410007,China [3]Technical Center,China Energy Construction Group Hunan Thermal Power Construction,Zhuzhou,412011,China [4]School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha,410076,China

出　　处：《Energy Engineering》2024年第1期77-94,共18页能源工程（英文）

基　　金：This work was funded by the project of State Grid Hunan Electric Power Research Institute(No.SGHNDK00PWJS2210033).

摘　　要：The distribution network exhibits complex structural characteristics,which makes fault localization a challenging task.Especially when a branch of the multi-branch distribution network fails,the traditional multi-branch fault location algorithm makes it difficult to meet the demands of high-precision fault localization in the multi-branch distribution network system.In this paper,the multi-branch mainline is decomposed into single branch lines,transforming the complex multi-branch fault location problem into a double-ended fault location problem.Based on the different transmission characteristics of the fault-traveling wave in fault lines and non-fault lines,the endpoint reference time difference matrix S and the fault time difference matrix G were established.The time variation rule of the fault-traveling wave arriving at each endpoint before and after a fault was comprehensively utilized.To realize the fault segment location,the least square method was introduced.It was used to find the first-order fitting relation that satisfies the matching relationship between the corresponding row vector and the first-order function in the two matrices,to realize the fault segment location.Then,the time difference matrix is used to determine the traveling wave velocity,which,combined with the double-ended traveling wave location,enables accurate fault location.

关 键 词：Multi-branch lines distribution network fault location double-ended traveling wave positioning least square method 

分 类 号：P31[天文地球—固体地球物理学]