Abstract
In an AC microgrid (MG), the grid-supporting inverters (GSIs) are crucial components, which can regulate the frequency and voltage and enhance power supply reliability. To provide a reliable utilization of distributed generation (DG) and ensure uninterrupted operation of critical loads, a seamless handover between islanded and grid-connected modes is required for an AC MG with multiple parallel operating GSIs. Traditionally, the phase angle and frequency are usually detected by the phase-locked loop (PLL) units. Furthermore, the centralized control structure is widely used to obtain the global information of the system for grid synchronization, which will reduce the system reliability and flexibility. In this paper, a distributed cooperative grid synchronization strategy is proposed for multiple parallel GSIs. A seamless handover can be performed under the proposed control strategy that only needs to transmit the synchronization information to the leader DG without using any PLL units, which is more simple, effective, and flexible. The results of the simulation and StarSim Hardware-in-the-loop experiment are presented to confirm the effectiveness of the proposed control strategy.
Published Version
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