城市轨道交通列车再生制动能量穿越时钢轨电位分布规律仿真分析

Simulation Analysis of Rail Potential Distribution Pattern with Crossing of Urban Rail Transit Train Regenerative Braking Energy

当前,城市轨道交通钢轨电位过高引起的钢轨电位限制装置频繁动作、轨旁设备打火、杂散电流泄漏量增大等现象严重,对乘客人身安全及线路杂散电流水平有较大影响,而针对多列车动态运行过程汇总再生制动能量穿越时钢轨电位分布规律尚待进一步研究。对城市轨道交通供电系统动态运行过程中钢轨电位分布规律进行研究,建立系统供电-回流-列车全模型下钢轨电位动态分布模型。分析了多区间多列车并列动态运行情况下再生制动列车回馈至牵引网功率被其他供电区间列车利用情况下钢轨电位的变化情况。研究分析表明,系统多列车动态运行时,再生制动能量穿越情况对钢轨电位影响较大。

Currently,situations caused by urban rail transit high rail potential such as frequent action of OVPD(over-voltage protection device),fire of rail side equipment and increased amount of stray current leakage are serious,having concerning influence on passenger safety and stray current level of the line.The rail potential distribution pattern during the crossing of collective regenerative braking energy of multiple trains operating in dynamic traction network requires further research.The rail potential distribution pattern under urban rail transit power supply system dynamic operation is studied,and rail potential dynamic distribution model under the overall model of system power supply-reflux-train is established.The variation of rail potential under the conditions of multiple trains running at multiple intervals and the regenerative braking energy fed back to the traction network being reused by trains at other intervals is analyzed.Results show that when multiple trains are operating in the system,the impact of train regenerative braking energy crossing on rail potential is distinct.