Coordinated control of battery storage system and diesel generators in AC island microgrid

This paper proposes a coordinated control method of the diesel generators (DGs) and battery storage system (BSS) in AC island microgrid. When the DGs run as the main power source, an auxiliary power control signal is added to the conventional droop control for BSS to prevent system collapses caused by long-time over-current of the DGs, which can improve the stability of the microgrid. To avoid short-term outage when the main power source in the micro-grid changes from the DGs to BSS or from the BSS to the DGs, a seamless transition control strategy for the DGs and BSS is presented. Finally, the control methods previously mentioned had been validated with the PSCAD simulation software.