一种城市轨道直流牵引供电系统馈线保护的新方法

摘要

The DC traction power supply system is an important part of urban rail transit, its reliable operation is the basis for the safe and stable operation of urban rail transit system. According to the existing urban rail DC feeder short-circuit criterion cannot correctly distinguish the starting current of heavy locomotive and the end short circuit current when has car, caused by the failure of protective devices, this paper proposes in the current rise rate and current increment protection, meanwhile increases the ratio of peak current and stable current value as the auxiliary criterion of traditional protection. Finally it builds the simulation model of urban rail transit system in MATLAB/Simulink. The simulation results show that the proposed method is feasible and effective.%直流牵引供电系统作为城市轨道交通的重要组成部分,其可靠运行是城市轨道交通系统安全稳定运行的基础.针对现有城市轨道直流馈线短路判据无法正确区分机车重载时的启动电流和有车时远端短路电流,而造成保护装置失效的问题,提出在电流上升率和电流增量保护的基础上,增加电流峰值与电流稳定值的比值作为传统保护的辅助判据,通过在MATLAB/Simulink中搭建城市轨道交通系统的仿真模型和仿真结果分析验证了所提方法可行有效.