基于V2G技术的电动汽车双向功率变换器控制策略分析

Analysis of Control Strategy of Electric Vehicle Bidirectional Power ConverterBased on V2G Technology

随着大量电动汽车接入电网,电网安全稳定受到挑战,因此需使电网与电动汽车间进行友好功率交互。基于V2G技术设计一种隔离型双向功率变换器,采用两级拓扑结构,前级AC-DC采用三相桥式结构,后级DC-DC采用双有源主动桥结构。设计相应控制策略,前级采用双闭环和PQ控制策略,后级采用单移相控制策略,以满足双向潮流传输的需求。结合电池模型对所设计的变换器进行仿真,验证了变换器能够满足功率双向流动和电池充放电要求。

With the rapid growth of EV in the distribution network,the security and stability of the power grid are challenged,hence,friendly power interaction between the power grid and electric vehicles is required.This paper designs an isolated bidirectional power converter based on V2G technology,which adopts two-stage topology.The first stage AC-DC uses three-phase bridge structure,and the second stage DC-DC uses dual active bridge structure.The corresponding control strategy is designed.The former stage adopts double closed loop and PQ control strategy,and the latter stage adopts single phase shifting control strategy to meet the requirements of bidirectional power flow.The designed converter is combined with the battery for simulation,which verifies that the converter can meet the requirements of bidirectional power flow and battery charging and discharging.