Study On The Advanced Passenger Train Auxiliary Power Supply System

The auxiliary power supply system for railway passenger trains is the core system for trains and the guarantee for passengers 'safe and comfortable journey.In recent years,the rapid development of China's high-speed railway industry has put forward new requirements for the performance and stability of passenger train auxiliary power supply systems.According to the latest national standards,the auxiliary power supply system for passenger trains in China is mainly composed of a DC120 V charger,an AC380 V three-phase inverter and an AC220 V single-phase inverter.The train equipment bus and backup batteries is powered by the charger and the passenger electrical equipment is powered by the single-phase inverter.The performance of the above equipment directly determines the safety of the train and the comfort of passengers.Therefore,research and design of a high-performance train auxiliary power supply system is of great significance to further improve the performance of passenger trains.The research and design of the high-performance train auxiliary power supply system are carried out according to the latest national standards in this thesis.For the problems of low efficiency and short service life of the charger of the traditional train auxiliary power supply system,the full-bridge ZVZCS soft switching converter is adopted to realize the soft switching of the charger in a wide load range,reduce the switching loss of the IGBT and improve the charging efficiency and service life of the charger.Based on the analysis of the working principle of the converter,the main circuit components of the charger are designed.and the small signal model of the PSFB ZVZCS converter is established.According to the actual working requirements of the charger,the closed-loop control circuit of constant voltage charging mode and constant current charging mode is designed.The closed-loop simulation model of the charger is built using Matlab/Simulink,which verifies the feasibility of the control method.According to the input and output requirements of the single-phase inverter,the two-stage inverter topology of Boost-Full Bridge Inverter circuit is adopted,and the main loop components are designed.For the problems of large output static error,poor load disturbance suppression ability and waveform distortion of the traditional train single-phase inverter,the voltage and current double-loop control whit load current feedforward is applied to the train single-phase inverter,which effectively solves these problems.The closed-loop control circuit of the single-phase inverter is designed based on the small signal model.The closed-loop simulation model of the single-phase inverter power supply is built using Matlab/Simulink,which verifies the feasibility of the control method.For the problems of poor interchangeability,difficult maintenance,and easy damage to the hardware circuit of the control system of the traditional train auxiliary power supply equipment,a general control circuit and a general IGBT drive circuit are designed to improve the versatility and reliability of the control drive circuit.Comprehensively considering the above,fully considering the actual use situation,the TMS320F28335 chip is used to write the auxiliary power system control program,which solved the difficulty of protection setting and the problem that the fault prompt is not obvious.On this basis,an auxiliary power system test prototype is built,and the control program is tested experimentally.The test results show that the control program has good adaptability to the actual working conditions,and the output stability and dynamic performance of the auxiliary power supply system meet the design requirements.There are 91 figures,8 tables and 86 references in this thesis.