一种具备故障阻断能力的低导通损耗模块化多电平换流器

论文面向具备直流侧故障阻断能力的MMC子模块拓扑开展研究,通过详细分析半桥型和全桥型MMC子模块在直流侧故障时的工作特性,提出一种基于逆阻型元件的新型子模块:该拓扑无需向子模块正常电流通路中插入额外功率器件,即可改变故障电流路径。与现存具备故障阻断能力的子模块拓扑相比,提出的拓扑在正常工况下具有更低的导通损耗。为了验证提出拓扑的有效性,在Matlab/Simulink环境下搭新型MMC换流器仿真平台,并搭建相应样机,全面验证所提的子模块拓扑具备直流侧故障阻断能力。

A Low Conduction Loss Modular Multilevel Converter With DC Fault Blocking Capability

This paper studies the topologies of modular multilevel converter(MMC) sub-module with DC side fault blocking capability. By analyzing the working characteristics of half bridge and full bridge MMC sub-modules in DC side fault condition, a new sub-module based on reverse blocking devices was proposed. The topology can change the fault current path without inserting additional power devices into the normal current path of the sub-module. Compared with the existing sub-module topologies with DC fault blocking capability, the proposed topology has lower conduction loss under normal conditions. In order to verify the effectiveness of the proposed topology, an MMC converter simulation platform was built in the Matlab/Simulink environment, and the corresponding prototype was built to comprehensively verify the DC side fault blocking capability of the proposed sub module topology.