The increasing integration of renewable energy sources into power grids requires adaptive strategies to maintain stability, especially

in island and distribution grids. This paper presents the development of a 200 kVA battery inverter with grid-forming control

for the integration of photovoltaics (PV) into island grids. The inverter uses a three-phase ANPC topology with two interleaved

legs and a DC-DC converter with flying capacitor topology. Usually, PV systems shut down as soon as they detect an island

grid. However, the integration of renewable energy is crucial for future grid reliability, especially in isolated or disaster-affected

regions. The energy management system aims to integrate PV systems into the grid during island grid operation, prevent battery

overcharging and ensure grid-serving functionalities. Using the VDE 4105 guidelines, the system controls PV active power by

adjusting the grid frequency and optimizes the battery’s state of charge (SoC) for reliability and durability. Laboratory tests with

Power-Hardware-in-the-Loop (P-HiL) demonstrate the effectiveness of the system in maintaining uninterrupted grid operation

and adapting PV power generation to the needs of the microgrid.