A formal definition from the U.S. Department of Energy Microgrid Exchange Group[REF] states: A microgrid is a group of interconnected loads and distributed energy resources (DERs) within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid.
From the definition from the EU research projects:[REF] microgrids comprise Low-Voltage (LV) distribution systems with distributed energy resources (DERs) (microturbines, fuel cells, PhotoVoltaics (PV), etc.), storage devices (flywheels, batteries) energy storage system and flexible loads.