Application and Control of Bidirectional T-Type Converter in Hybrid Bipolar AC/DC Microgrid

The integration of bidirectional T-Type converters into hybrid bipolar AC/DC microgrids is a transformative step toward enhancing energy efficiency, reliability, and flexibility in modern power systems. This paper presents the design, implementation, and experimental validation of a novel bidirectional three-level T-Type converter with an emphasis on current control and DC voltage capacitor balancing. The converter bridges DC microgrids with AC systems, enabling efficient power exchange and system interoperability. A single-resonant current control strategy is developed to achieve high performance under dynamic loading conditions, ensuring precise regulation and minimal distortion. Additionally, a novel DC voltage capacitor balancing control mechanism is implemented to maintain system stability and prolong component lifespan. The experimental setup demonstrates the feasibility and robustness of the proposed design, paving the way for its application in advanced hybrid microgrid systems.