不同子模块MMC在中压直流配电网中的应用研究  

The Study of Different Sub-modules MMC in Medium-voltage DC Distribution Systems Application

作　　者：唐圣辉[1] 袁旭峰[1] 唐立[1] 李宁[1] 张天卫[1] 谈竹奎 

机构地区：[1]贵州大学电气工程学院,贵州贵阳550025 [2]贵州电力科学研究院,贵州贵阳550002

出　　处：《贵州大学学报（自然科学版）》2017年第6期43-48,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金(51667007);中国南方电网有限责任公司重点科技项目(GZKJQQ00000417)

摘　　要：模块化多电平换流器(Modular Multilevel Converter,MMC)的子模块是其核心部件。结合MMC在中压直流配电网领域的广阔前景,分析了MMC常见的半桥型、全桥型子模块结构。简化半桥型、全桥型、混合型三种子模块结构的MMC在直流侧双极短路故障时的等效电路,从理论上分析了三种子模块结构的MMC对直流侧双极短路故障的抑制能力。针对三种子模块结构MMC,分别通过基于PSCAD/EMTDC的两端MMC系统的仿真,验证了理论分析的正确性。得出在中压直流配电网中,混合型子模块结构MMC在技术上的可行性和经济上的优越性。为未来中压直流配电网中换流器子模块拓扑的选择提供参考。b The sub-module of modular multilevel converter （ MMC ） is its core component. Combined with the broad prospect of MMC in the field of medium voltage DC distribution systems, half-bridge sub-module and full bridge sub-module structure of MMC were analyzed. Simplifying the equivalent circuit of MMC in DC-side bipolar short circuit with half-Bridge, full-Bridge, hybrid sub-module structures respectively, the ability of MMC to control the DC short circuit faults were analyzed theoretically. Aiming at the three kinds of sub-module structure of MMC, the correctness of the theoretical analysis was verified by the simulation of MMC system based on PSCAD/ EMTDC. It is concluded that the hybrid sub-module structure MMC is technically feasible and economically superior in medium voltage DC distribution systems, which can be used as a reference for the selection of converter sub-module topology in the future medium voltage DC distribution systems.

关 键 词：模块化多电平换流器 半桥型子模块 全桥型子模块 混合型子模块 直流故障 

分 类 号：TM46[电气工程—电器]