考虑列车运行工况的钢轨电位硬件动态模拟平台

Rail Potential Hardware Dynamic Emulator Considering the Train Operating Condition

为解决钢轨电位和杂散电流治理措施开展但现场验证难度大的问题,钢轨电位硬件动态模拟平台近年来获得广泛关注。但现有硬件动态模拟平台通常仅考虑走行轨纵向电阻变化,而忽略列车运行工况和走行轨-大地过渡电阻的影响,无法准确再现钢轨电位随列车运行工况的动态规律。为此,提出一种考虑列车运行工况的钢轨电位硬件动态模拟平台。首先通过直流牵引供电系统模型,分析列车运行工况对钢轨电位的影响,根据接触网、走行轨及走行轨-大地过渡电阻的变化特性,研究包括低阻模块(LRM)与高阻模块(HRM)的钢轨电位硬件动态模拟平台工作原理和数学模型,并提出考虑列车运行工况的硬件动态模拟平台控制策略。最后通过仿真和实验结果,验证相关理论和控制策略的正确性。

The rail potential hardware dynamic emulator(RPHDE)has received considerable research attention in recent years in view of the field verification challenges of rail potential and stray current mitigation measures.However,existing RPHDEs generally do not consider the influence of train operation conditions and rail-to-earth resistance on rail longitudinal resistance;therefore,they cannot accurately reproduce the dynamic rail potential distribution along the line.A novel RPHDE that considers train operating conditions is proposed.This study first analyzes the influence of train operating conditions on rail potential using a DC traction power supply system model.Subsequently,based on the analysis of the dynamic characteristics of the catenary,running rails,and rail-to-earth resistance,the operational principles and mathematical model of the proposed RPHDE are investigated.Moreover,the corresponding control strategies of the RPHDE considering the train operating conditions are also proposed.The simulation and experimental results verified the validity of the aforementioned theoretical analysis and control strategies.