Power converters utilizing bidirectional topologies are essential for maintaining continuous microgrid operation and ensuring reliable power delivery to both DC and AC loads. This paper introduces a hybrid AC–DC microgrid architecture that delivers reliable power to various loads while providing enhanced operational flexibility and robust resilience under dynamic and fault conditions. The design and inclusion of a bidirectional DC-DC converter provides critical functionalities such as prioritization of essential loads (e.g., life-support systems), extension of the DC voltage operating range, and galvanic isolation. The proposed communication-free control strategy employs a voltage gradient detection method for rapid event identification and smooth bidirectional power transfer. Each module within the DC microgrid autonomously monitors local parameters and, based on positive or negative voltage gradient variations, determines its operating mode accordingly. The effectiveness of the proposed strategy is validated through experimental laboratory studies conducted under dynamic charging and discharging scenarios.
