基于PSCAD的高速铁路全并联AT牵引供电系统短路故障仿真计算研究

以长昆高速铁路邓家山变电所至廖家田分区所供电区间为研究对象,根据实际接线方式、系统参数进行等效计算,利用PSCAD/EMTDC元件库元件搭建模型,设置相关参数,搭建全并联AT高速铁路牵引供电系统仿真模型,以实现对变电所及牵引网各种短路故障的仿真计算。以实际短路试验为例进行仿真,仿真计算数据与实测数据比对结果表明,基于PSCAD/EMTDC建立的全并联AT牵引供电系统仿真模型能够准确地模拟实际供电系统不同故障情况下短路电流的大小及短路电流的分布情况。利用该仿真计算结果,根据"横联线电流比"故障测距法进行故障定位计算。结果表明:数据满足故障测距要求,该模型能够为今后深入研究高铁牵引供电系统的故障及保护设备的运行等提供科学依据。

Research on Short Circuit Fault Simulation of All-parallel AT Traction Power Supply System for High-speed Railway Based on PSCAD

Taking the section between Dengjiashan Substation and Liaojiatian section post power supply on Changsha-Kunming High Speed Railway as the research object,this paper establishes a all-parallel AT power supply system simulation model for high-speed railway with PSCAD/EMTDC component to set relevant parameters and conducts simulation calculation of various short circuit faults of substation and traction network based on equivalent calculation according to the actual connection mode and system parameters. The actual short circuit tests are taken as examples and the results of the comparison of simulation data and measured data show that all-parallel AT traction power supply systemsimulation model based on PSCAD/EMTDC can accurately simulate the size and distribution of shortcircuit current of the power supply system under different fault conditions. Based on the simulation results,fault location calculation is conducted by means of"the current ratio of paralleling lines". The results show that the data meet the requirements of fault locating. This model can provide a scientific basis for further study of the fault and operation of the protection equipment of high speed railway traction power supply system.