Research And Implementation Of Three-phase Rectifier Based On VIENNA

The Ministry of Industry and Information Technology exposed that the timetable for research and development to stop the production and sales of conventional energy vehicles has been set at the 2017 China Automotive Industry Development International Forum.Major countries in the world have also issued timetables for banned traditional energy vehicles in their respective countries.Most of them are between 2025 and 2040.In order to replace the market of traditional energy vehicles,large-scale development of new energy vehicles is a foregone conclusion,and with the vigorous development of the electric vehicle industry,equipment for charging electric vehicles,that is,charging pile equipment is indispensable.The performance of the charging module in the charging pile has a great impact on the power grid,so improving the performance of the charging module is a very important issue.Only the high efficiency,high power factor,low THD charging module can bring a good power supply environment to the power grid.Solving the power factor problem mainly through improves the voltage input and the power factor by improving the phase of the input current.As a result,various power factor correction circuits have been proposed by the industry.The power factor correction circuit used in this paper is a three-phase VIENNA rectification topology.This is a threephase three-level boost type midpoint clamp circuit with the characters of high power factor,low THD,a small number of power switches,the small voltage stress on the switch tube and so on.The charging module is mainly composed of the front-end three-phase VIENNA rectifier circuit and the post-stage LLC resonant converter circuit.The main research in this paper is the front-end three-phase VIENNA rectifier circuit.The main design includes:(1)The principle of three-phase VIENNA rectifier topology and the selection of the main device parameters.First,introducing several common power factor correction circuits,analyzing the process of the development of power factor correction circuit and the advantages and disadvantages of each circuit.On this basis,the three-phase VIENNA rectifier topology circuit is selected as the main power factor correction circuit,and the main circuit operation process is analyzed according to the parameter design goals,and the parameters of the main circuit components are calculated.(2)The design of main circuit of system and controller.According to the analysis of the parameters of the main circuit of the charging module,the relevant circuit devices are selected,and a main power circuit is designed based on the topology of the three-phase VIENNA rectifier.At the same time,an auxiliary power supply is designed to provide 3.3V,5V,and other voltage level power supplies.To ensure the stable power supply for each circuit chip,a high-precision integrated operational amplifier is used to design the sampling conditioning circuit to accurately sample the input and output voltages and currents,providing the basis of hardware for the closed-loop control of the system.By establishing three-phase stationary abc coordinate system of three-phase VIENNA rectifier and dq rotating coordinate system mathematical model,SVPWM modulation technology research three-phase rectifier control strategy,design system control loop.The controller circuit is designed based on TMS320F28032 that the main control chip,and the program of main system,PWM subroutine,timer subroutine and the other design of program are completed,and the system software design is completed.(3)Simulating the experiment and analysing the result.According to the circuit of design,the parameters of device,and the control strategy,building the platform of system simulation by Simulink in Matlab.The simulation verified the rationality and effectiveness of the design.Then,fabricating the main circuit,auxiliary power supply,protection circuit,IGBT drive circuit,sampling circuit,control circuit,etc.The prototype of the system experiment was set up.The on-line debugging of the LLC resonant converter module was carried out and verifying the rationality and effectiveness of the design.