Design And Implementation Of Electric Vehicle High Power Charging Rectifier Based On VIENNA

Under the current background of the global energy crisis,energy saving and emission reduction and sustainable energy development have become the focus of attention in various countries.As a new energy vehicle,electric vehicles have received strong support from various countries and face short-term recharging of current electric vehicles.The problem of slow,high-power charging pile came into being.This paper analyzes the technical indicators and functions of high-power charging piles and independently designs and develops a 60 kW high-power DC charging pile rectifier system.The main circuit adopts the VIENNA topology and the control method adopts a new type of voltage and current based on PI sliding mode hybrid control.Double closed-loop control,the main research content is as follows:Firstly,the technical specifications of high-power charging pile rectifiers are given.According to the analysis of their functional requirements,the overall design scheme is proposed.Then the working principle of VIENNA circuit is analyzed,and the mathematical model is established in the coordinate system,coordinate system and coordinate system respectively.Finally,for the phase-locked loop,a digital phase-locked loop based on frequency conversion filtering and amplitude phase compensation is proposed.Through simulink simulation analysis,we know that the phase-locked loop has high phase-locking accuracy and phase-locking speed,which can be applied in practice.It is well applied.The overall hardware architecture of the VIENNA rectifier system is designed.By calculating the parameters of the main circuit,the components of the inductor,capacitor,switch and diode are selected.In the design of the weak current circuit,the main control circuit and the acquisition are designed respectively.The schematic diagram of the circuit and drive circuit,and its working principle were analyzed.In order to improve the safety and reliability of the system work,overcurrent protection and short circuit protection circuits were designed in the acquisition circuit and the drive circuit,respectively.For the VIENNA rectifier space vector modulation,a modulation method based on the two-level method is used.By analyzing the influence of each basic space vector on the midpoint potential,a midpoint potential balance control strategy based on the adjustment factor is given and separately A simulink simulation was performed to verify the performance of the charging pile rectifier.A new double closed-loop control method based on PI sliding mode hybrid control was proposed.The voltage outer loop was controlled by sliding mode and the inner current loop was controlled by PI.Simulated by simulink,the results show that the PI controller's dual closed-loop controller greatly improves the system's dynamic response speed.According to the design plan,an experimental platform was set up,and the prototype was assembled.The technical indicators and working performance of the system were tested through the experimental platform and the prototype.From the test results,the VIENNA-based electric vehicle high-power charging pile rectifier designed to meet the requirements of the indicator and has better dynamic performance and stability.