Research On Train Auxiliary Inverter Controller

In recent years,with the rapid development of high-speed railway in China,the huge market demand makes the research on auxiliary inverter of auxiliary power supply equipment carrier more and more important.Auxiliary inverter system mainly includes vehicle air conditioning,lighting,battery charging,train monitoring system,on-board signal and communication equipment power supply,which is an important part of the train power supply system.In this thesis,the control algorithm of auxiliary inverter and the realization of software and hardware are studied.Firstly,the SVPWM control algorithm of the auxiliary inverter main circuit is analyzed.For the midpoint potential imbalance problem of the inverter,this paper introduces a control factor k and multiplies k by the action time of two small vectors.This adjusts the action time between the positive and negative small vectors in each control cycle to achieve the purpose of suppressing the fluctuation of the midpoint potential.At the same time,the control strategy of voltage and current double closed loop is adopted to realize different operating conditions such as sudden change of load in a single auxiliary inverter.Stable operation under.With the continuous improvement of the reliability requirements of the auxiliary inverter,the parallel inverter technology of the auxiliary inverter is studied to realize the high reliability and high power operation of the auxiliary inverter.Firstly,the single-phase phase-locked loop technology suitable for parallel operation of the inverter system is introduced and improved.Secondly,based on the deficiency of the traditional droop control technology,the dynamic control performance based on the virtual synchronous generator is used to improve the dynamic performance of the system.Steady-state current sharing,and simulation model was built by MATLAB/SIMULIINK simulation platform.Finally,based on LabVIEW FPGA technology,each part of the software and hardware circuits needed for the auxiliary inverter system is designed.Firstly,the whole set of upper computer control system is built in LabVIEW,and then the inverter parallel system experimental platform is designed according to the system technical requirements.The hardware circuit tests the feasibility of the parallel system experimental platform built under various working conditions,and analyzes the experimental results and experimental waveforms.