| Summary: | In this article, a novel multi-port multi-directional converter (MPMDC) is proposed. Even though the power stage of the MPMDC belongs to a single-stage structure, it can control power flow direction handily among ports and achieve converter operation in up to five modes. The MPMDC has the feature of galvanic isolation and can obtain a high voltage conversion ratio even under the adoption of only one inductor and one transformer. The leakage energy of the transform can be recycled to improve overall efficiency. Once the MPMDC is applied to deal with renewable energy, battery, and bus energy, the advantage of multi-directional control of power flow can advance an energy storage system to perfectly function power conditioning feature. In addition to the discussion of converter operation, voltage gain, voltage stress, current stress, and inductance design are analyzed theoretically. Comparisons with some of the latest similar converters are also carried out. A 200-W prototype is built and measured. According to the practical results, it is verified that the hardware measurements meet the theoretical derivations and the MPMDC is validated. The maximum efficiency of the converter is up to 94%.
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