Open Access

ARTICLE

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

by Hua Leng¹, Silin He², Jian Qiu³, Feng Liu^4,*, Xinfei Huang⁴, Jiran Zhu²

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

* Corresponding Author: Feng Liu. Email:

Energy Engineering 2024, 121(1), 77-94. https://doi.org/10.32604/ee.2023.028340

Received 13 December 2022; Accepted 29 June 2023; Issue published 27 December 2023

Abstract

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.

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Keywords

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