一种具有快速直流故障处理能力的低成本MMC子模块拓扑

This paper proposes a modular multilevel converter (MMC) sub-module structure with low switching loss and fast blocking function of DC bipolar short-circuit fault current. The proposed structure is able to output levels of three voltage levels. Compared with the traditional MMC composed of full-bridge submodule, its fault current blocking speed is doubled when the number of sub-modules is the same.