轨道电位与杂散电流动模实验平台

Rail Potential and Stray Current Dynamic Emulator

采用走行轨回流的直流牵引供电系统存在轨道电位与杂散电流问题,给城市轨道交通的安全运行带来隐患。上述问题的抑制措施开展现场验证难度大,为此,提出一种基于可变电阻模块的电力电子动模实验平台。首先,分析了双边供电系统中不同接地方式下的任意位置轨道电位和杂散电流随列车位置变化的三维分布规律;然后,将动模实验平台、牵引变电所和列车牵引电流相结合,通过动模实验平台可再现不同接地方式下列车与牵引变电所处的轨道电位及总杂散电流;最后通过仿真与实验结果验证了轨道电位与杂散电流动模实验平台的正确性与可行性。

Rail potential and stray current issues,which endanger the safety of urban rail transit,are unavoidable in the DC traction power supply system with rail returning current.But it is difficult to verify the inhibition measures of the above issues in field.Therefore,this paper proposes a dynamic emulator of power electronics based on variable resistance module.The three-dimension distribution of rail potential and stray current varying with train position in bilateral power supply system with different grounding modes are analyzed.Combining the dynamic emulator,traction substation and train traction current,the rail potential and total stray current of the train and traction under different grounding modes are reproduced by the dynamic emulator.Finally,the correctness and feasibility of the experimental platform of rail potential and stray current flow model are verified by simulation and experimental results.