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This paper presents an improved submodule unified pulse width modulation (SUPWM) scheme for a hybrid modular multilevel converter (MMC) composed of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs). The proposed SUPWM scheme can achieve an output voltage of (2N+1) (where N is the number of submodules in each arm) levels, which is the same as that of the carrier-phase-shifted PWM (C...

An improved submodule unified pulse modulation scheme for a hybrid modular multilevel converter