Composite Load Equivalent Modeling of Traction Power Supply System

In recent years, China's high-speed railway from zero to one, from weak to strong, has achieved a leapfrog development. However, the access of a large number of electrified railways is a further challenge for the safety, stability and economy of the power grid, but the current research on the composite load characteristics of traction substations is relatively weak. In this paper, a detailed simulation model of CRH2 emu is built firstly. Based on the analysis of the operation characteristics and load composition of the traction power supply system, a composite load equivalent model of high-speed railway traction power supply system - the mechanism load model of “constant impedance parallel induction motor” is proposed. Finally, the Matlab/Simulink was used to compare the simulation results of the detailed simulation model with those of the equivalent model, and the results showed that the obtained power curve was highly consistent, which verified the accuracy and practicability of the equivalent load model.