Rule-based Energy Management Strategy for Grid-connected Multi-microgrid System based on Distributed Power Exchange

This paper presents an innovative energy management strategy (EMS) tailored for grid-connected multi-microgrid (MMG) systems, with a focus on distributed power exchange. The proposed MMG system framework can operate in both grid-connected and islanded modes. In grid-connected mode, the strategy emphasizes local power exchange through a two-stage approach to reduce reliance on the main grid. Firstly, microgrids manage their own demand and energy storage systems (ESS). Second, a rule-based strategy facilitates power exchange among neighboring microgrids, utilizing a hierarchical decision-making model. This model prioritizes direct power exchange between microgrids with excess or shortage of power, fostering collaboration. Optimizing renewable energy use through this approach has the potential to reduce reliance on the main grid, potentially leading to cost savings. Additionally, the system seamlessly transitions to islanded mode during grid outages, ensuring uninterrupted power supply. Simulation of the proposed strategy using a two-MG system demonstrates its effectiveness in fostering a more sustainable and reliable power grid with minimized main grid reliance.