Microconverters integrate single PV modules into medium-voltage DC Buses, with the possibility of enhancing reliability through battery inclusion. Despite extensive research, current topologies often face trade-offs between low component count, high voltage gain and efficiency. This paper proposes a three-port microconverter featuring high voltage gain suitable for reaching a 380V DC bus, efficiently handling power from state-of-the-art PV modules up to 750W. For increased reliability, the system supports battery integration, supplementing or absorbing power up to the nominal level if needed, offering robust performance even under fluctuating weather conditions. Maximum Power Point Tracking (MPPT) for PV modules and output voltage regulation for the DC bus are implemented. The design is experimentally verified by a prototype with a nominal power of 750W and exhibiting an average efficiency of 95%.
