充电桩三相AC/DC双向变换器控制策略研究

Research on Control Strategy of Three-Phase AC/DC Bidirectional Converter in Charging Pile

针对目前常规电动汽车充电桩只能单向被动充电、功率因数低且产生大量谐波的问题,在充电桩中引入有源功率因数校正(APFC)技术并采用改进型空间矢量脉宽调制(SVPWM)算法的双闭环直接电压控制,对三相半桥主电路的参数及其PI控制器参数进行设计。利用MATLAB/Simulink仿真软件搭建模型,带入相关参数进行仿真和试验,验证结果表明,所提出的控制方法能够实现电能的双向变换并保持输出电压的稳定,可提高功率因数和电能质量。

Conventional electric vehicle charging piles can only be charged one-way passively,the power factor is low and a large number of harmonics are generated.To solve these problems,this paper introduces the Active Power Factor Correction(APFC)technology into the charging pile and the improved Space Vector Pulse Width Modulation(SVPWM)algorithm is applied for double closed-loop direct voltage control,and the parameters of the three-phase half-bridge main circuit and its PI controller parameters are designed.MATLAB/Simulink simulation is used to build an experimental model,and relevant parameters are introduced for simulation and experimental verification.The verification results show that the proposed control method can realize the bidirectional conversion of electric energy,keep the output voltage stable and improve the power factor and power quality.