基于虚拟同步机的电动汽车双向变流器功率控制

在电动汽车储能充放电领域,对电动汽车双向变流器运用虚拟同步机(VSM)技术,可以实现与电网的友好交互与电能质量的显著提升.因此按照同步电动机的理论模型建立系统仿真模型,采用功率控制的控制策略对电动汽车双向变流器进行控制.研究了在电网电压暂升暂降故障以及网侧功率剧烈波动时,选用传统下垂控制策略与采用虚拟同步机技术的电动汽车充/放电器的动态行为.并对电网中电动汽车充电器在充/放电模式下经历此过程的耐受特性进行分析验证.仿真结果证明了研究方法的有效性与正确性.

Power Control of Electric Vehicle Bidirectional Converter Based on Virtual Synchronous Machine

In the field of energy storage charge and discharge of electric vehicles, the virtual synchronous machine (VSM) technology can be applied to the bidirectional converter of electric vehicles to achieve friendly interaction with the power grid and significantly improve the power quality. Therefore, the system simulation model is established according to the model of three-phase synchronous motor, and the power control method is adopted to effectively control the two-way converter of electric vehicle. The dynamic behavior of EV charger/discharger with traditional droop control strategy and virtual synchronous machine technology is studied in the case of grid voltage transient rise and fall fault and grid side power drastic fluctuation. The tolerance characteristics of EV chargers undergoing this process in charge/discharge mode were analyzed and verified. Simulation results show the effectiveness and correctness of the proposed method.