Improved fault location method for AT traction power network based on EMU load test

作     者：Guosong Lin Xuguo Fu Wei Quan Bin Hong Guosong Lin;Xuguo Fu;Wei Quan;Bin Hong

作者机构：School of Electrical EngineeringSouthwest Jiaotong UniversityChengdu 611756China 

出 版 物：《Railway Engineering Science》 (铁道工程科学（英文版）)

年 卷 期：2022年第30卷第4期

页      面：532-540页

核心收录：

学科分类：08[工学] 080204[工学-车辆工程] 0802[工学-机械工程] 0823[工学-交通运输工程] 

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB2601500) the Natural Science Foundation of Sichuan Province(No.2022NSFSC0405)。 

主　　题：Fault location EMU load test BP neural network AT traction power network High-speed electrified railway 

摘      要：The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power network.With the development of high-speed electrified railways,a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point(Q-L relation)is mostly nonlinear.Therefore,the linear Q-L relation in the traditional fault location method always leads to large errors.To solve this problem,a large number of load-related current data that can be used to describe the Q-L relation are obtained through the load test of the electric multiple unit(EMU).Thus,an improved fault location method based on the back propagation(BP)neural network is proposed in this paper.On this basis,a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method,respectively,which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network.Finally,combined with a shortcircuit test,the accuracy of the improved method is verified.