直流牵引供电系统多站钢轨电位交互影响分布特性  

Distribution characteristics of the rail potential interaction between multi-stations in DC traction power supply system

作　　者：张晓萍 郑子璇 罗春晖 杜贵府 张驰 ZHANG Xiaoping;ZHENG Zixuan;LUO Chunhui;DU Guifu;ZHANG Chi(Applied Technology College of Soochow University,Kunshan Jiangsu 215300,China;School of Rail Transportation,Soochow University,Suzhou Jiangsu 215131,China)

机构地区：[1]苏州大学应用技术学院,江苏昆山215300 [2]苏州大学轨道交通学院,江苏苏州215131

出　　处：《北京交通大学学报》2022年第2期138-147,共10页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(52007128)。

摘　　要：为阐明城市轨道交通多个车站钢轨电位交互影响下分布特性,分析了钢轨电位限制装置(Over Voltage Protection Device,OVPD)等装置的动态接地特性,建立了直流牵引供电系统多站钢轨电位交互影响的仿真模型.基于该仿真模型,建立了牵引供电系统的节点电压方程组并通过迭代计算进行求解,从而得到线路的潮流参数以及钢轨电位、杂散电流的分布情况.基于国内某实际线路的参数仿真分析了多站钢轨电位及杂散电流的动态分布规律,从而首次阐明了系统多站钢轨电位交互影响的机理.研究结果表明:OVPD动作会造成泄漏电流增多并抬升其他位置的钢轨电位幅值,因而触发其他站点的OVPD接续动作,进一步抬升全线钢轨电位与杂散电流.此外,多站OVPD同时动作往往为泄漏电流构成回路,导致杂散电流水平激增.以上研究为OVPD动作特性的优化以及线路钢轨电位、杂散电流的控制提供了依据.In order to illustrate the distribution characteristics of the rail potential interaction between multi-stations in urban rail transit, this paper analyzes the dynamic grounding characteristics of Over Voltage Protection Device(OVPD) and other devices. And a simulation model of rail potential interaction between multi-stations in DC traction power supply system is established. Based on the simulation model, the nodal voltage equations of the traction power supply system are established and solved through iterative calculations, obtaining the power flow parameters of the line and the distribution of rail potential and stray current. Simulations are conducted using the parameters of an actual line in China,and the dynamic distribution law of rail potential and stray current at multi-stations is analyzed. This demonstrates the mechanism of the rail potential interaction between multi-stations in the system for the first time. The research results show that the grounding action of OVPD will increase the leakage current and raise the rail potential amplitude at other positions, thus triggering the grounding actions of OVPDs at other stations, further raising the rail potential and stray current on the entire line. In addition, the simultaneous operation of OVPD at multiple stations often provides a circuit for leakage current, resulting in a sharp increase in stray current. The above research provides the basis for optimizing the OVPD operating characteristics and controlling the rail potential and stray current.

关 键 词：直流牵引供电系统 动态接地 钢轨电位 杂散电流 交互影响 

分 类 号：U239.5[交通运输工程—道路与铁道工程]