Abstract: With the development of electric vehicles,charging stations based on V2Gconcept have received great attention in recent years.In this paper,based on V2Grequirements,a charging machine with bidirectional power flow is studied.A topology scheme of PWM rectifier+ bidirectional DC/DC is proposed.The mathematical model of the main circuit is established,and the working mechanism is analyzed in detail.For two-stage charging,constant current discharging and charge-discharge translation,a control strategy based on DC-bus voltage as a control variable is proposed,and the parameters of PI regulator are designed in detail.The whole scheme of charging machine is simulated,and the hardware system of charging machine is realized by using digital signal processor(DSP).The simulation and experimental results show that the V2Gcharger has good performance,which realizes the bidirectional flow of energy and the unit power factor of the grid side.

Key words: V2G, charging station, lithium battery, PWM rectifier

摘要： 随着电动汽车的发展,基于V2G理念的充电站近年来得到了极大的关注。本文基于V2G要求研究了具有功率双向流动能力的充电机,提出了PWM变流器+双向DC/DC的拓扑方案,建立了主电路的数学模型,详细分析了工作机理。针对两段式充电、恒流放电、充放电转换提出了以直流母线电压为观测量的控制策略,并对PI调节器参数进行了详细设计。充电机整体方案进行了仿真研究,同时采用数字化控制方式(DSP)对充电机硬件系统进行了实现。仿真和实验结果表明,该V2G充电机具有良好的性能,实现了能量的双向流动,并且可实现网侧单位功率因数。

关键词:  , V2G, 充电站, 锂电池, PWM变流器