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直流牵引供电网络故障分析对城市轨道交通牵引供电系统设计有着重要的作用。针对整流机组,采用多段折线的外特性模型,使用变化理想电压源、内阻的戴维南等效电路模拟,并通过迭代的方法确定短路时的工作区间。建立了包括杂散电流收集网在内的供电系统仿真模型,可较准确地仿真短路时各整流机组负荷以及接触网、钢轨与杂散电流收集网电位等的变化情况。
DC traction power supply network fault analysis of urban rail transit traction power supply system design has an important role. For the rectifier unit, the multi-segment polylines external characteristic model is adopted, the Thevenin equivalent circuit with varying ideal voltage source and internal resistance is simulated, and the working interval in the short circuit is determined by an iterative method. The simulation model of power supply system including stray current collection network is established, which can simulate the changes of load of each rectifier unit and the potential of the contact net, rail and stray current collecting net when the short circuit occurs.