城轨直流牵引供电多回流路径耦合建模及回流安全参数动态分布  

Multiple Reflux Paths Coupling Modeling for Urban Rail DC Traction Power Supply and Dynamic Distribution of Reflux Safety Parameters

作　　者：郑鑫 杜贵府 李巧月 江星星 黄伟国 Zheng Xin;Du Guifu;Li Qiaoyue;Jiang Xingxing;Huang Weiguo(School of Rail Transportation Soochow University,Suzhou 215131 China;School of Optical and Electronic Information Suzhou City University,Suzhou 215104 China)

机构地区：[1]苏州大学轨道交通学院,苏州215131 [2]苏州城市学院光学与电子信息学院,苏州215104

出　　处：《电工技术学报》2024年第15期4630-4642,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52007128)。

摘　　要：当前,城轨直流牵引供电系统回流安全已成为影响线路安全运行的关键问题之一。为研究多回流路径耦合对回流安全参数及周边关键金属工程的影响,该文提出多回流路径耦合情况下直流牵引供电系统动态仿真模型,构建多回流路径耦合矩阵,建立多回流路径耦合情况下多区间回流安全参数动态分布计算方法,实现回流安全参数动态分布规律分析。基于实际线路参数,分析了不同类型多回流路径耦合时钢轨电位和杂散电流分布规律。研究结果表明,该文所提出的方法可有效模拟多回流路径耦合情况下回流安全参数动态分布及对周边关键金属工程的影响;针对走行轨回流不畅及多回流路径耦合,分别提出并联电缆及单向导通控制的治理方法,并基于该文所建立的模型进行仿真分析,验证了其有效性。DC traction power supply systems are usually adopted in urban rail transit.Rail potential and stray current are the reflux safety parameters of the system,which have become the key problems affecting the safe operation of urban rail lines.Excessive rail potential seriously affects the safety of traction power supply system,and stray current will flow through the surrounding ground and buried metal pipeline,causing serious electrochemical corrosion to the key buried metal projects around.With the deterioration of local or regional insulation of the running rail,the coupling operation of multiple reflux paths is obvious.In general,the modelling and analysis of reflux safety parameters have mainly focused on the urban rail system itself.In order to study the influence of multiple reflux paths coupling on reflux safety parameters and surrounding key metal projects,this paper proposes a dynamic simulation model of DC traction power supply system under multiple reflux paths coupling.Firstly,based on the structure of DC traction power supply system with multiple reflux paths coupling,the dynamic simulation model of DC traction power supply system with multiple reflux paths coupling is established.The model introduces coupling sections at both sides of poor reflux and adds multiple reflux paths between these coupling sections,described by means of the matrix of multiple reflux paths coupling.Then the dynamic distribution calculation method for multi-interval reflux safety parameters under multiple reflux paths coupling is established.Finally,the distribution of rail potential and stray current under different types of multiple reflux paths coupling is analyzed based on the actual line parameters.Simulation results show that,when the running rail insulation deterioration coupling,the amplitude of the rail potential at the deteriorating position will decrease,stray current generates a sudden change,the whole line rail potential will be pulled down or raised,and the maximum value of whole line stray current increased to-800

关 键 词：城市轨道交通 直流牵引供电系统 多回流路径耦合 钢轨电位 杂散电流 

分 类 号：TM922.3[电气工程—电力电子与电力传动]