The Simulation Of A Novel Cophase Traction Supply System

The current traction power supply system has adopted different phase power supply technology. Traction power supply system for electrified railways have seriously unbalanced three phases and large amount of harmonics and reactive power and such systems need neutral section insulators to be installed in all power districts. This lays restraints on development of high-speed heavy-load railways. Now, a new cophase traction power supply system based on the extensively development of power electronics technology is proposed. We hope the cophase traction power supply system could solve the existing problems. At the same time it could minimize the electricity on the power system for pollution. New type of traction power supply system mainly includes PWM voltage source rectifier, rectifier part of the DC energy storage and SPWM inverter.Three-phase voltage source PWM rectifier is established and it also analyzes the working principle, mathematical model, control strategy and regulator parameter design for the VSR. The system voltage is from 66kV into 60kV. This paper design the rectifier main circuit, control circuit. Rectifier part introduces the method of control and it establishes the mathematical models and SIMULINK model.The single-phase voltage PWM inverter changes the system from DC 66kV into AC 27.5kV. One SPWM inverter is designed, including the reasonable switching device parameters. It also introduces the adjacent network-operating substation.In the last, the results of the simulation prove that the design is feasible and the result is correct.The unbalance is eliminated and it realizes cophase power supply, solves the problems in crossing neutral sections.