期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 66, 期 3, 页码 2227-2235出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2017.2756582
关键词
DC-AC converter; medium-voltage converter; modular multilevel converter (MMC); variable frequency operation
This paper proposes a delta-channel modular multilevel converter (MMC). It aims to overcome the issues of the conventional MMC during zero/low fundamental frequency operation. The proposed converter is characterized by the cross connection of both the upper and the lower three arms through two sets of delta-channel branches. These delta-channel branches timely redistribute power among three phase legs, leading to the minimized submodule capacitor voltage fluctuations, even at zero/low fundamental frequency operation. The inner power balancing through physical channels makes the converter inject no common-mode voltage. A 4160-V, 1-MW simulation model is performed in MATLAB/SIMULINK, and a 208-V, 5-kW experimental setup is constructed in the laboratory. Both the simulation and experimental results verify the feasibility of the proposal.
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