Abstract
Hybrid modular multilevel converter (Hyb-MMC) consisting of a mix of half bridge (HB) and full bridge (FB) submodules (SMs) has emerged as a topology capable of handling reduced dc voltage conditions without causing large increase in capital cost and losses. However, successful application of Hyb-MMC requires suitable modulation schemes that can establish stable operation. The challenge intensifies in cases of reduced dc voltage operation where the modulation index reaches values much higher than unity. This work proposes a method in which the arm voltage reference is divided between the HB and FB SMs such that the energy balance for both the groups (HB and FB) are maintained independently. The mathematical basis of the method of division of the arm voltage reference has been derived and the upper limit of modulation index for stable operation with the proposed strategy is computed. The method is tested by applying it on a Hyb-MMC simulation in EMTDC/PSCAD platform.
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