Research On Dynamic Simulation Of Emus Auxiliary Power Supply System

With the rapid development of high-speed railway in China, EMUs (Electric Multiple Units) play an increasingly important role in passenger transportation. As a significant part of the EMUs, the excellent performance of auxiliary power supply system guarantees the EMUs to operate safely and steadily. Therefore, the study on EMUs auxiliary power supply system is of great significance.First of all, the thesis made a preliminary research on the structural principle of the LCM (Line Converter Module), the ACM (Auxiliary Converter Module) and the BCM (Battery Charger Module) based on the auxiliary power supply system of the CRH1 high-speed EMUs. In the next place, by means of power electronics technology, the auxiliary power supply system of EMUs was researched and analyzed deeply. The main circuit of the LCM is a single phase bridge PWM (Pulse Width Modulation) rectifying circuit; Auxiliary inverter mainly involves with three-phase bridge voltage inverter circuit, the control circuit of which uses SPWM (Sinusoidal Pulse Width Modulation); the BCM is made up of three-phase half-controlled bridge rectifying circuit and DC-DC half-bridge converter, the control circuits of which utilize phase synchronization and PWM individually.The simulation analysis was made by some to the overall progressively and the article simulated dynamically the main conditions of the EMUs auxiliary power supply system that included the starting of HVAC (Heating, Ventilation and Air Conditioning) and the charge and discharge of batteries. The simulation models of the LCM, the ACM and the BCM were established by Matlab/Simlink and Matlab/SimPowerSystem, the output voltage harmonic analysis of which was made and the results were in line with the corresponding technical requirements. On the basis of these models, the paper set up further the dynamic simulation models of TBU1's and TBU3's (Train Basic Unit) auxiliary power supply system, the dynamic simulation results were checked with the previous analysis results each other. At last, compared with the simultaneous starting of HVAC, the simulation results had proven that the surge current and voltage in MVB (Multifunction Vehicles Bus) had been respectively reduced 73.51% and 95.24% when the HVAC started in sequence to reduce effectively the impact of HVAC starting on the EMUs auxiliary power supply system; Through the dynamic simulation, the essay obtained the characteristic curves of the batteries'charge and discharge.