V2G充放电机的设计及其仿真

The Design and Simulation of V2G Charging-Discharging Device

随着电动汽车的广泛应用和智能电网的发展,电动汽车与电网互动(Vehicle to Grid,简称V2G)技术变得越来越重要。充放电机作为电网和电动汽车的接口,对于实现两者间的能量双向流动至关重要。研究并设计了基于四象限AC/DC变流器和双向DC/DC变流器的V2G充放电机,用以控制电网与电动汽车蓄电池间的能量流动;AC/DC变流器利用瞬时功率理论和电流模式闭环控制,实现了其与电网之间有功功率和无功功率的解耦控制;DC/DC变流器分别采用基于蓄电池充电电压、充电电流和基于中间直流母线电压的闭环控制,对应实现了蓄电池充电时的多段模式和放电时的功率调节。利用MATLAB/SIMULINK系统全面地仿真了V2G充放电的多种工况,仿真结果表明,该充电机能实现V2G所要求的相应功能,实现能量的双向流动满足用户的需求。

With the wide application of electric vehicles and the development of smart grid,V2G（ Vehicle to Grid） technology is becoming more and more important. As the interface between the electric vehicles and smart grid,the charging-discharging device is of great importance in the energy bi-directional flow. The V2G charging-dischar-ging device has been designed based on four-quadrant AC/DC converter and bi-directional DC/DC converter in this paper,so as to control the energy flow between the power grid and the automobile storage battery. The instantane-ous power theory and the current closed-loop control mode are adopted by AC/DC converter to achieve the decou-pling control of active and reactive power. DC/DC converter will realize the multi-section mode while charging and the power regulation while discharging by using double closed-loop control based on charging voltage ,charging cur-rent and intermediate DC bus voltage. Various working conditions of V2G charging-discharging device are simulated in Matlab/simulink environment. The results of simulation show that the charger can achieve corresponding functions of V2G,and realize the energy bi-directional flow so as to meet the needs of users.