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The isolated modular DC-DC converter (IMDCC) is a new topology designed to connect high-voltage direct current (HVDC) lines with different voltage levels, which ties two DC grids by using two modular multilevel converters (MMCs) via a medium-frequency transformer. Due to the large value of capacitance in the IMDCC, proper precharge strategies before the start-up are significant for the safety and...
One specific issue associated with the modular multilevel converter (MMC) is that the capacitors of the submodules (SMs) need to be precharged before MMC begins its normal operating. Otherwise, a large inrush current will occur if these SM capacitors were not charged to the rated value. This paper proposes a novel start-up control scheme for MMC, in which the closed-loop control is adopted to regulate...
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