Research On Three Phase PWM Converter

Facing the environment pollution and energy crisis, electric vehicles have gradually become focus of attention of world countries and academia, advanced charging equipment of electric vehicle is a solid foundation for the development of electric vehicles. As we all know, electric vehicle chargers are usually high frequency charger. Because energy can be absorbed by the diode rectifier, but the diode rectifier causes severe harmonic pollution to the grid. As an AC/DC conversion technology, PWM rectifier technology has high output power factor, good dynamic response, and can achieve bi-directional flowing of energy, so it can solve the grid pollution problems caused by non-controlled rectifier.As a part of multi-purpose electric vehicle charging system, the research in this paper can effectively solve harmonic pollution to the power grid, and lays the foundation for the development of electric vehicles.In this paper, the main circuit topology and basic principles of three-phase voltage PWM rectifier are described, and mathematical models of PWM converter are derived. At the same time, the double-loop control mode based on SVPWM control method is studied deeply.The main circuit element parameters are designed in the paper, and simulation research is done in MATLAB environment. The models with PI control regulators of voltage outer loop and current inner loop are established in this paper. Simulation results show that the control strategy is feasible.In this paper, the control board based on TMS320LF2407A DSP chip is designed, and the software and hardware of system is expounded detailed. At last, the actual system debugging is carried out. The results show that the control strategy is correct and the system design is feasible in the paper.