AN SiC‐based soft‐switching and self‐power supply MMC for MVDC

Here, a novel modular multilevel converter (MMC) and its associated control scheme are proposed for medium-voltage direct-current (MVDC) distribution systems. The voltage gain power can achieve wide-range expansion by expanding sub-modules. voltage, current, shared among all In addition, semiconductor devices implement soft switching under low stress current introducing an auxiliary cell in each sub-module. By reasonably distributing the energy collected process, realizes self-power supply drive circuit of high-potential switches, wherein sub-modules turned on step step. structure is described working principle strategy analyzed detail. Finally, 1.8 kW experimental prototype based SiC provided to efficiency 97.3%.