Enhancing DC microgrids integration with three-phase AC grids using multiport converters

DC Microgrids offer a zero-carbon emission solution to meet the escalating demand for electric energy by facilitating the integration of renewable energy sources, energy storage, and loads.To enhance the stability and sustainability of DC microgrids, a bidirectional power interface with the utility grid is adopted.This paper proposes a non-isolated multiport converter that interfaces three-phase AC grids with multiple microgrids, allowing for minimizing the overall size and cost compared to the multi-converter approach, and providing additional flexibility and resilience to the system.The main objective of the study is to validate the superior performance of the proposed converter compared to the conventional approach of interconnecting DC-DC and AC-DC converters in a cascaded connection.The study comprehensively evaluates semiconductor device stresses, losses, total chip area, and magnetic element size for both approaches.Finally, experimental results of the proposed converter are presented.