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The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved...
Modular multilevel converter (MMC) is now the state-of-the-art converter topology for high power applications. MMC topology has been commercially introduced in high-voltage dc transmission (HVDC) converter systems as well as medium-voltage (MV) industrial AC drives. To limit overall device losses in high power applications, the device switching frequency of power semiconductor devices should be limited...
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