基于虚拟同步发电机技术的无缝切换控制策略

在微网系统中储能电源的并网及离网运行状态及两者之间的动态切换过程直接影响到敏感负荷的供电质量。针对该问题,文章采用一种基于虚拟同步电机的储能逆变器控制方法,使储能逆变器等效于受控电压源,同时具备惯性模拟、调频、调压功能;此外提出一种储能逆变器并离网无缝切换控制策略,可以实现并、离网状态及两者之间的自动平滑切换,最后搭建了微网实验平台,实验结果验证了所提控制策略的有效性。

Seamless Switching Control Strategy Based on Virtual Synchronous Generator Technology

In micro-grid system,the grid-connected operation and off-grid operation of energy storage power supply and the dynamic switching process between them directly affect the power supply quality of sensitive load.To solve this problem,a control method of energy storage inverter based on virtual synchronous motor is adopted in this paper,where the energy storage inverter is made equivalent to the controlled voltage source and have the functions of inertia simulation,frequency modulation and voltage regulation.In addition,a seamless switching control strategy for the energy storage inverter is proposed,which can realize either grid-connected or off-grid status as well as automatic smooth switching between them.Finally,a micro-grid experimental platform is built and the experimental results verify the effectiveness of the proposed control strategy.