A Control Strategy for the Seamless Transition between Islanded and Grid-connected Microgrid with PV and Storage

For the microgrid system with peer-to-peer control strategy, the primary challenge is to foster cooperative interaction between the microgrid and the main grid. Achieving seamless transitions between grid-connected and islanded operation modes stands as the pivotal issue to address. Therefore, this paper initially outlines the fundamental structure of a microgrid alongside its corresponding control strategy. Considering the limitations of traditional mode switching, a parallel switching method for smooth transitioning is proposed, wherein PQ control is implemented during grid-connected operation and droop control is applied during islanded mode, which effectively tackles power oscillation within the microgrid system during the transition, enabling rapid frequency restoration. Finally, the simulation platform of a microgrid with PV and storage is established to verify the effectiveness of the proposed smooth switching control strategy.