高铁牵引供电系统对实时电网运行影响研究

以武广高速铁路沿线某牵引变电站为背景,研究高铁牵引供电系统对实时电网运行的影响.利用PSCAD搭建了适用于高速铁路的牵引供电仿真系统.运用Jiles-Ather-ton铁磁磁滞原理建立了V/v牵引变压器的暂态模型,并在仿真系统中通过统一电磁等效电路(unified magnetic equivalent circuit,UMEC)普通变压器模型表示.设置UMEC模型中分段线性的U-I曲线来等效铁芯的饱和特性,并进行空载合闸仿真.在此基础上,对电网侧进行单相短路故障仿真、三相短路故障时的有载合闸仿真.仿真结果验证了牵引变压器暂态模型和牵引供电仿真系统的实用性和有效性,并为相关调度运行部门提供了可靠的理论依据.

Study on the Effect of High-speed Railway Traction Power Supply System on Real-time Power Grid Operation

With the Wuhan-Guangzhou high speed railway traction substation as the research background,the effect of high-speed railway traction power supply system on real-time power grid operation was studied,and PSCAD was applied to build suitable traction power supply simulation system for high-speed railway.Jiles-Atherton ferromagnetic hysteresis principles were employed to establish transient model of the V/v traction transformer.The piecewise linear U-I curve of UMEC model was equivalent to the saturated characteristics of the iron core,and then,no-load closing simulation was done.On this basis,simulation of single-phase short circuit fault and switch-in with load was done in time of three-phase short circuit fault in line side.The simulation results verify the practicality and validity of the traction transformer’s transient model and traction power supply simulation system,which provides a reliable theoretical basis for the related operation departments.