城轨回流系统动态排流与钢轨电位控制仿真研究

当前,城轨供电回流过程中杂散电流与钢轨电位问题突出,排流装置与钢轨电位限制装置(OVPD)作为杂散电流与钢轨电位的治理设备被广泛采用,但系统运营过程中动态排流与钢轨电位控制仿真方法及分布规律尚缺乏研究。通过建立回流系统动态排流与钢轨电位控制仿真模型,分析多区间多列车动态运行过程中全线钢轨电位与杂散电流动态分布规律。研究结果表明,单点钢轨电位控制过程中会引起其他位置OVPD连锁动作,还会大大抬高全线杂散电流水平;杂散电流动态排流过程中,全线钢轨电位与杂散电流水平均会出现一定程度的抬升,因此当前钢轨电位控制与杂散电流排流方法应进一步结合系统多点耦合干扰特性进行改善。

Simulation of Dynamic Drainage and Rail Potential Control in Urban Rail Power Supply System

At present, stray current and rail potential problems are prominent in the reflow process of urban railway power supply systems. Drainage devices and rail potential limiting devices(OVPD) are widely used as regulating devices for stray current and rail potential. There still exists a lack of research on the simulation method and distribution law of rail potential control and dynamic drainage. In this paper, the dynamic distribution of rail current and stray current in the dynamic operation of multi-interval and multi-train is analyzed by establishing the dynamic drainage and rail potential control simulation model of the reflux system. The research results show that the single-point rail potential control process will cause the action of OVPD at other positions, and greatly raise the level of stray current of the whole line; In the dynamic drainage of stray current, the whole line rail potential and stray current will rise by a certain degree. The current rail potential control and stray current discharge method should be further improved by integrating the multi-point coupling interference characteristics of the system.