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Hybrid modular multilevel converter (MMC) is considered as a promising topology to deal with DC fault in MMC based high-voltage direct current (HVDC) due to the negative output from full-bridge sub-module (FBSM). In addition, the modulation index can be promoted with the negative output, which can enhance the AC voltage and transmission power in steady state. This paper focuses on this situation that...
This letter proposes an improved nearest-level modulation (NLM) method to enhance the quality of output voltage of a modular multilevel converter (MMC) with the low amount of submodules, as well as restrain the voltage fluctuation of the submodules. By adding a small offset, which is alternating at the double fundamental frequency to the reference signals, a small phase shift of the step-changing...
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