Abstract
This paper proposes an offset voltage control scheme for the modular multilevel converter (MMC) operated in nearest level control (NLC) to improve the total harmonic distortion (THD) of AC phase voltages. Through the offset voltage control, the magnitude of each AC pole voltage maintains constant value with N+1 level in the range of whole modulation index (MI). The validity of the proposed scheme was confirmed by computer simulations for the MMC with 22.9kV/25MVA and experimental works for the scaled MMC with 380V/10kVA. It was confirmed that the proposed control scheme can generate constant pole voltages regardless the value of MI, and form phase voltages with improved THD.
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