Sliding Mode-based Distributed Event-triggered Secondary Control for Islanded Microgrid

Abstract This paper investigates the fixed-time distributed secondary control (DSC) problem for an islanded AC microgrid (MG) consisting of multiple distributed generators (DGs) subject to bounded disturbances, aiming to compensate for deviations arising from primary control. An innovative robust control strategy is proposed, which integrates a dynamic event-triggered (DET) communication mechanism with an integral sliding mode surface, effectively conserving communication resources while providing strong immunity against disturbances. The strategy employs a variable exponent sliding mode reaching law to accelerate convergence, thereby ensuring the reachability of the sliding mode surface. Fur-themore, this strategy guarantees that the voltage and frequency of the DGs under disturbance are synchronized to their reference values within a fixed-time and achieves power distribution within a fixed-time while avoiding zeno behavior. Finally, the effectiveness of the proposed strategy is validated through a simulation example involving a MG with four DGs.