期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 38, 期 10, 页码 12743-12756出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3294793
关键词
Bidirectional; dc-dc; medium voltage (MV); modular multilevel converter (MMC); resonant; soft switching; wide voltage range
In this article, a full-range soft switching converter with wide voltage gain is proposed for modular multilevel resonant dc-dc converters. The converter utilizes a modular multilevel structure and CLLC resonant tank for isolated and bidirectional power conversion in medium-voltage applications, achieving high efficiency. The coordinated gain control method enables wide and continuous voltage gain regulation.
The arm inductor is found to cause the loss of soft switching in modular multilevel resonant dc-dc converters, so a full-range soft switching converter with wide voltage gain is proposed in this article. The modular multilevel structure and the CLLC resonant tank are utilized in the converter for isolated and bidirectional power conversion inmedium-voltage applications with high efficiency. Wide and continuous voltage gain regulation can be achieved with the proposed coordinated gain control method. The submodule voltages are balanced by voltage sampling and individual gate signal controls. The requirements for full-range soft switching are explained. Finally, a laboratory prototype is constructed and the experimental results verify the theoretical analysis.
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