基于多序列环流注入的可扩展端口直流固态变压器运行与控制

Modular multilevel converter (MMC) based on solid-state transformer (M-SST) has emerged as a promising solution in hybrid medium voltage ac/dc distribution grids. By contructing a separate low voltage dc (LVdc) bus on each arm of M-SST, an extensible port-dc solid state transformer (EPdc-SST) is introduced in this article, which not only meets requirements of different voltage levels, but also sup...