基于虚拟同步机的电动汽车快速充电控制技术

Virtual synchronous machine based fast charger control technology for electric vehicle

随着电动汽车扩张式发展,电动汽车快速充电技术受到越来越多地关注。电动汽车动力电池需要通过变流器接入电网实现并网和功率传输,大量电动汽车快充过程中变流器传输功率波动很大,而传统的控制策略虽然响应迅速,但是缺少惯性和阻尼支撑,因而对电网的冲击很大。针对该问题,提出了一种基于虚拟同步机的电动汽车快速充电控制技术,在兼顾快速充电的同时,通过模拟同步电机的惯量和阻尼特性,平抑传输功率的波动,改善并网点电能质量。最后,在 MATLAB/Simulink中搭建了电动汽车快速充电系统,验证了该方法的有效性和准确性。

With the development of electric vehicle expansion,the fast charger technology has been paid more and more attention. Power battery of electric vehicle needs to be connected through the inverter and the transmission power fluctuates greatly during the process of charging. Although the traditional control strategy is of rapid response,but bad for the safety because of lacking inertia and damping support,which has great impact on power grid. This paper proposes virtual synchronous machine based faster charger control technology for electric vehicle to solve this problem. It mimics the behavior of a synchronous machine to balance the fluctuation of transmission power as well as meet the requirements of faster charging,and it can enhance inertia and damping of inverter and improve the power quality. Finally,the fast charger for electric vehicle model is built on MATLAB and the simulation results support the validity and correctness of the proposed method.