Research On The Metro Vehicle Auxiliary Power System Simulation And Experiment

In addition to the traction conversion system supplying the electric power for traction electric machine, there is also the auxiliary power system for the loads on the metro vehicle. The three-phase and single-phase AC power are offered by the SIV for the metro vehicle air conditioning units, the ventilation equipment, the air compressor, the electric heater device, the AC lighting and the AC loads, etc. The DC power supply is provided by the charger for the vehicle system control circuit, the DC lighting, the electric door, the vehicle signal and communication equipment and charging batteries. Therefore, it is very significant to design a set of the auxiliary power system.Firstly, the basic structure and characteristics and key performance indicator requirements of the metro vehicle auxiliary power system are expounded in this paper. Through the MATALB platform, the12-pulse rectifier circuit is simulated and analyzed, and the DC1500V voltage which is switched is provided for the auxiliary power system.Then, the advantages and disadvantages of the push-pull electric circuit, half bridge inversion and full bridge inversion are analyzed, because of the half bridge inversion with the strong ability to resist imbalance, the half bridge inversion circuit topology is selected as the DC110V charger and DC24V power circuit. For the five kinds of auxiliary inverter system scheme, the advantages and disadvantages are analyzed in detail, and the two of them relatively have certain advantages, namely the two-level scheme with the line-frequency transformer isolation and the DC-DC conversion scheme with the high-frequency transformer isolation, and are fitter for the Metro vehicle.On this basis, the theories of the two-level scheme are elaborated, and the control strategies of the auxiliary inverter and the charger DC110V and DC24V are researched. According to the design requirements, the parameters of each part of the system are calculated. Taking the MATLAB as the platform, the circuits are modeled, simulated, analyzed and performed. The simulation and experimental results show that, the performance indexes of the auxiliary power system designed in this paper meet the design requirements, and have a certain practical significance. In the end, through analysis and comparison, the three-phase four-leg inversion scheme is selected for improving the DC-DC conversion scheme, and the improved scheme of modulation strategy is modeled, simulated and analyzed, and the improved scheme is feasible in theory.