直流牵引供电系统短路故障计算

Calculation of Short Circuit Fault of DC Traction Power Supply System

针对目前主要采用经验公式对短路稳态电流进行计算,对暂态电流计算存在不足的情况,对直流牵引供电系统构成及工作原理进行分析,通过搭建直流牵引供电系统Matlab/Simulink仿真模型对直流侧短路情况进行仿真分析,在此基础上提出一种新的单边供电出口处及远端短路系统内阻、内电感拟合公式计算方法,通过对该方法、经验公式和仿真模型的短路数据进行比较,在计算远端短路时,尤其是1.5 km以内的远端短路,该拟合公式计算误差远小于经验公式计算值,验证了该拟合公式的正确性。

With regard to that the experience formulae are mainly used for calculation of short circuit steady state current and the insufficiency in calculation of transient current calculation at present,analyze the DC traction power supply system constitution and working principles,simulate and analyze the short circuit status at DC side by establishing of Matlab/Simulation model for DC traction power supply system,and on the basis of this,put forward a new type of fitting formula calculation method for system internal and external inductance at unilateral power supply exit and short circuit at remote end,by this method,and by comparison of short circuit data of this method,experience formula and simulation model,the calculation errors by this fitting formula are far less than the calculated values calculated by the experience formula for calculation of remote end short circuit,especially for short circuit of remote end within 1.5 km,and it verifies the correctness of this fitting formula.