Understanding Inter-Microgrid Operation for Power Sharing in a Multi-Microgrid System

This paper investigates mutual power sharing between neighbouring microgrids (MGs) to enhance system reliability and resilience. A droop-based supervisory control strategy is implemented to achieve proportional power sharing among inverters within and between MGs. A coupling and decoupling strategy is formulated to regulate the interconnection of two microgrids, facilitating seamless transitions while maintaining frequency deviations within 0.2 Hz during coupling and voltage variations below 60V. Simulation results in MATLAB/Simulink indicate that the proposed approach fosters effective power sharing while maintaining voltage and frequency within acceptable limits across diverse load conditions, achieving nearly equal power distribution between the two microgrids and ensuring stable operation during coupling and decoupling events. This validates the practicality of applying traditional islanded microgrid control methods to multi-microgrid (MMG) systems for enhanced power management.