Distributed Direct Power Sliding-Mode Control for Islanded AC Microgrids

The aim of this article is to develop a novel distributed direct power sliding-mode control for an islanded AC microgrid. This solution replaces the droop mechanism of each inverter with two separate sliding surfaces working as primary/secondary controllers. The design of these surfaces is based on the dynamic model of the active and reactive powers to enhance the robustness against line impedance mismatches. Moreover, a theoretical stability analysis is presented. The main features of this proposed control are to regulate the voltage and frequency achieving an accurate active and reactive power sharing, achieve stability under a wide range of line impedances, and provide robustness toward external disturbances, including communication failures. Finally, the experimental results verify the controller performance, the stability with different line impedances, and the robustness against communication partitions.