地铁牵引供电系统直流侧短路故障研究

Study on Short-circuit Fault on DC Side of Metro Traction Power System

牵引网短路故障中线路电气参数的暂态变化是研究轨道线路保护与控制技术和短路故障定位技术的基础;基于Matlab/Simulink建立了24脉波整流电路模型,计算了集肤效应作用下等效接触网与钢轨网的电阻和电感值,建立了直流牵引供电系统牵引网短路故障仿真模型,利用该模型对空载线路下牵引变电所近端与远端的牵引网短路故障进行仿真,分析电流瞬态值随不同故障距离变化情况;仿真结果曲线充分反应整流机组等非线性器件使得近端短路瞬态电流峰值呈振荡收敛状态,证明了该模型的准确性,为牵引变电系统线路保护装置的精确配置提供参考。

The transient variation of line electrical parameters in catenary short circuit fault is the basis of researches for technology of line protection and short circuit fault location.Based on Matlab/Simulink,a 24-pulse rectifier circuit model is established,the transient resistance and inductance value of the equivalent catenary and rail network under the skin effect are calculated,the short Circuit fault simulation model of DC traction power supply system is established,the short-circuit fault of the traction network at close and distant points are simulated,the transient variation values of fault current with the different fault distance are analyzed.The simulation results show that the transient current peak of the near-end short circuit is oscillatory and convergent due to the nonlinear devices such as rectifier unit,which proves the accuracy of the model and provides a reference for the precise configuration of the line protection equipments of traction substation system.