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This paper applies a control method based on current control and sum-capacitor-voltage estimation to the direct ac/ac modular multilevel converter. As capacitor voltages are estimated, their measurements are not needed in the high-level control, which simplifies the communication between the main controller and the submodules of the converter. The stability of the internal dynamics of the converter,...
In this paper, a comparison of the energy storage requirements is performed for the modular multilevel converter (MMC) with half-bridge and full-bridge submodules as well as for the alternate arm converter (AAC). Concerning the AAC, the operational mode with overlap period is taken into account and an analytical relation between the overlap angle and the modulation index is presented. This ensures...
This paper describes a new type of unisolated dc/dc converter employing cascaded converter cells, and its operation is analyzed. The topology and the operation of the converter have similarities with the modular multilevel converter for polyphase ac/dc conversion, but the ac voltages and currents are in this case only employed for redistributing power within the converter. It is shown how the nominal...
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