Abstract
A hybrid modular multilevel converter (MMC) consisting of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) is an ideal compromise of dc fault blocking capability and capital investment. In order to increase power transmission capability of the hybrid MMC, the FBSMs' negative voltage states are taken into account. This paper analyzes three normal operating modes of the hybrid MMC and provides corresponding mathematical models. The carrier phase-shifted sinusoidal pulse width modulation (CPS-PWM) technology, which is widely applied to the half-bridge submodules based MMC (HB-MMC) in the field of medium voltage, is modified to be employed in the hybrid MMC. Comparisons of the HB-MMC and the hybrid MMC under the three normal operating modes are conducted using MATLAB/Simulink. The validity of the mathematical models and the modified CPS-SPWM based modulation scheme for the hybrid MMC is confirmed by simulation studies.
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