Simulation research on auxiliary power supply system of medium and low speed maglev train

Abstract

Auxiliary power supply system is an important part of medium and low speed maglev train. It is mainly composed of auxiliary inverter, charger, suspension power supply, several battery packs and several loads. Taking Qingyuan medium and low speed maglev train as an example, the actual topology of its auxiliary power supply system is analyzed, the models of auxiliary inverter, charger and suspension power supply are established in the simulation system, and the internal working principle and working process of the system are studied in detail. The auxiliary inverter adopts three loop control and SVPWM control mode of current and voltage double closed loop, which improves the stability of the auxiliary inverter during load switching. Combined with the charging characteristic curve of battery pack, the constant current and constant voltage charging control strategy is studied, and the control logic of the simulation system is designed according to the actual operation of the auxiliary power supply system. The system level simulation on MATLAB®/Simulink® platform shows that each component can work stably under rated parameters, and meet the design requirements and the working requirements of auxiliary power supply system. Finally, its rationality and stability are analyzed. The robustness of the auxiliary power supply system model is verified by simulation. This research provides a certain theoretical basis for the research of auxiliary power supply system of medium and low-speed maglev train.