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应用虚拟同步电机技术的电动汽车快充控制方法

DOI: 10.13334/j.0258-8013.pcsee.2014.25.011, PP. 4287-4294

Keywords: 电动汽车,快充,虚拟同步电机,隔离型DC/DC变换器

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Abstract:

快充是电动汽车的一大关键技术。基于虚拟同步电动机控制策略,提出一种电网友好的电动汽车快充解决方案。该方案由交流接口和直流接口两部分组成,其中交流接口的三相H桥整流电路将电网电压整流为600V直流电压,再经过直流接口的大功率DC/DC变流器转换为48V的直流电压,供给电动汽车负荷。交流接口方案采用虚拟同步电动机技术,保证并网电流的低谐波畸变的同时,还可以响应电网电压/频率异常事件,并提高快充接口的惯性和阻尼,可在一定程度上提升电网的稳定性。该控制方法可降低电动汽车快充接口对电网的影响,提升电网对大规模电动汽车接入的适应性。直流接口采用隔离型DC/DC变换器,可以满足电动汽车电池快速恒功率充电的需求。在分别给出交流接口和直流接口的控制策略基础上,利用PSCAD/EMTDC仿真及一台50kW样机实验验证了所提快充解决方案的正确性和有效性。

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