Design Of Active Power Factor Correction And Control System For Electric Vehicle Charging Pile

With the continuous enhancement of people’s awareness of environmental protection,electric vehicles with energy-saving and environmentally-friendly characteristics have become the mainstream direction of the development of today’s automotive industry.Charging piles are not only the most common basic equipment for the energy supply of electric vehicles,but also an important prerequisite for the industrialization and marketization of electric vehicles.Active power factor correction technology(PFC)is an effective method to solve the problems of too low power factor of charging piles and too high total current harmonic distortion(THD).It is one of the main directions of current charging pile research.The main content of this paper is the active power factor correction circuit based on the three-phase VSR rectifier,and the charging pile control system design based on the charger REG50050 and the upper computer touch screen HMI-7569.This article analyzes the current research status of charging piles,and explains in detail the principle of active power factor correction.For the designed three-phase six-switch voltage type PWM rectifier(VSR),the mathematical model after coordinate transformation and feedforward decoupling is derived,and the control algorithm of the three-phase VSR rectifier is explained with two different modulations of traditional SVPWM and fast SVPWM.algorithm.The performance of the phase-locked loop of the synchronous rotating reference frame and the biquad generalized integral phase-locked is analyzed.For the active power factor correction circuit,the main parameters of the PFC circuit are determined,the appropriate device is selected according to this standard,and the simulation software PLECS is used to simulate the heat loss of the power tube.Auxiliary circuits such as IGBT protection circuit,drive circuit,zero-crossing circuit and sensor signal conditioning circuit are designed in detail.A simulation model of active power factor correction based on a three-phase VSR rectifier was built to verify the accuracy and effectiveness of the control strategy.This paper designs and builds an experimental platform for the charging pile system,designs the CAN communication network connection between each part,and conducts experiments on the charging power module of the charging pile system,and measures the waveforms and experimental data of each charging module respectively.At the same time,an experimental prototype of a three-phase VSR rectifier was made,and an active power factor correction experiment was performed on this circuit,which verified the feasibility of this design.