基于储能的交流微网运行模式无缝切换研究

Research on seamless switching of AC microgrid operation mode based on energy storage

基于储能装置的控制器添加了电压、电流补偿控制环节,提出一种微电网无缝切换控制策略以减少微电网在模式切换时的冲击。建立了基于风、光、储的微电网模型,储能装置在并网运行时采用P/Q控制,并在内环添加了微分反馈补偿控制;离网运行时采用V/F控制,在外环添加了微分前馈补偿控制,并与内环微分反馈控制共同工作,从而消除了切换过程中的冲击现象。利用PSCAD/EMTDC搭建微电网模型,仿真结果验证了所提控制策略的有效性,实现了微电网在并/离网运行模式的无缝切换。

In response to the impact phenomenon of the microgrid in the operation mode switching,the controller based on the energy storage device adds voltage and current compensation control loops A micro-grid seamless switching control strategy is proposed to reduce the impact of the micro-grid during operation mode switching.Established a microgrid model based on wind,solar energy and energy storage.The energy storage device adopts P/Q control when it is connected to the grid,and adds differential feedback compensation control to the inner loop.The off-grid operation adopts V/F control,and differential feedforward compensation control is added to the outer loop,and works together with the inner loop differential feedback control,thereby eliminating the impact phenomenon during the switching process.The microgrid model is built by PSCAD/EMTDC.The simulation results verify the effectiveness of the proposed control strategy and realize the seamless switching of the microgrid in the grid-connected/off-grid mode.