基于时域微分的地铁直流供电系统故障定位仿真

Simulation of Fault Location for Subway DC Power Supply System Based on Time Domain Differential

地铁运行过程中,金属性短路故障是最常见且最严重的故障类型之一,为了快速而准确地对地铁直流供电系统故障定位,提高城市轨道交通用直流牵引供电系统的工作可靠性,结合我国某地铁供电系统建立了直流供电系统短路故障电路拓扑结构模型。根据时域微分方程理论,计算了短路故障点与变电所的距离。运用最小二乘法对数据处理优化,提高了故障定位的准确性。研究结果表明:双端供电系统中,故障点位于两变电所中间区域时,定位准确度较高;短路点在两站中间位置的500 m范围内时,使用该方法定位误差小于6.15%。

The metallic short-circuit fault is one of the most common and serious fault type in subway operation process. In order to locate the fault of Metro dc power supply system quickly and accurately, and improve the urban rail transit with the working reliability of the de traction power supply system, combining with a subway power supply system of our country, the topological model of short circuit fault is established. According to the time domain differential equation theory, the distance between the circuit and the substation is calculated. Using the least square method to optimization of data processing, the precision of fault location is improved. The results show that the positioning accuracy is higher when the fault point is located in the middle of the two substations, and the error of the method is less than 6.15% when the short circuit is within the scope of 500 m in the middle of the two stations