Analysis and suppression of operational overvoltage and inrush current for high-speed trains by automatic phase-switching technique  

作　　者：Ye Cao Song Xiao Zhizong Ye Guangning Wu Yujun Guo Guoqiang Gao Chuanming Sun Jiancheng Liu Zheng Chen Hao Hou Zijing Wang Puyang Liu Yuhui Zhang Jie Yu 

机构地区：[1]School of Electrical Engineering,Southwest Jiaotong University,Chengdu,China [2]Guangdong Power Grid Limited Liability Company,China Southern Power Grid,Guangzhou,China [3]CRRC Qingdao Sifang Co.,Ltd.,Qingdao,China [4]State Grid Chongqing Electric Power Company,Chongqing,China

出　　处：《High Voltage》2024年第3期733-748,共16页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52277166,51922090,51837009。

摘　　要：When a high-speed train approaches the insulated phase-splitting section embedded between neighbouring power supply arms,the vacuum circuit breaker(VCB)installed on trains must be disconnected to maintain the traction power supply system as a no-load condition for completing phase-switching action,as the train passes through the phase-splitting section depending on its inertia.However,when operating VCBs,the arc is easily triggered between the mobile contacts inside,accompanied by an overvoltage impulse.Herein,to explore the generating mechanism of inrush current and operational overvoltage,a model describing the‘substation-catenary-train’traction power supply system is launched based on an equivalent circuit modelling technique.Through the analysis of the transient VCB operational process,the phase of catenary voltage is directly related to the characteristics of the VCB switching-on overvoltage,as the traction cur-rent's phase angle is relevant to the amplitude-frequency characteristics of the VCB switching-off overvoltage.Inrush current as a noteworthy element is related to the traction transformer's remanence.The automatic phase-switching technique is utilised to suppress both operational overvoltage and inrush current,as the optimal combination of VCB switching-on and switching-off phases considering the balance between overvoltage and inrush current is achieved based on the particle swarm algorithm.

关 键 词：TRACTION phase inrush 

分 类 号：U239.4[交通运输工程—道路与铁道工程] U223