MMC子模块拓扑搜索方法及其直流故障穿越能力定量评估  

Quantitative Evaluation on Topology Search Strategy of Sub-modules and DC Fault Ride-through Capability of MMC

作　　者：赵鹏豪 许建中[1] 赵成勇[1] 徐莹[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《华北电力大学学报（自然科学版）》2016年第5期14-21,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51177042)

摘　　要：模块化多电平换流器(Modular Multilevel Converter,MMC)的子模块类型包括半桥、全桥和双钳位子模块在内的多种常见拓扑,并且随着研究的深入新型子模块拓扑在不断涌现。提出了一种MMC子模块拓扑搜索方法,可以从理论上证明已有子模块拓扑的唯一性,进而重点研究了由搜索所得子模块拓扑组合而成的一种混合MMC结构。同时,为了精确评估MMC的直流故障穿越能力,提出了直流故障阻断能力指标(DC Fault Blocking Capability Index,DFBCI),可以对已有MMC拓扑以及混合MMC拓扑的直流故障穿越能力进行定量对比,进而验证了所推荐拓扑的经济性和有效性。最后在PSCAD/EMTDC环境下搭建了双端MMCHVDC系统模型,用以验证DFBCI指标的有效性。Sub-modules of Modular Multilevel Converter（ MMC） are in various forms,including half bridge sub-module,full bridge sub-module and clamp double sub-module. And new sub-modules are emerging with further study. In this paper,a topology search strategy of sub-modules for MMC is proposed,which is able to testify the unicity of some known sub-modules. Furthermore,hybrid MMC composed of searched sub-modules is discussed. To evaluate DC fault ride-through capability of MMC,an index called DC Fault Blocking Capability Index（ DFBCI） is proposed,which can be used to compare DC fault ride-through capabilities of different types of MMC topology and the hybrid MMC topology.And the economic efficiency and validity of the proposed topology is verified. Finally,the effectiveness of proposed index is validated in PSCAD / EMTDC with double-ended MMC-HVDC system model.

关 键 词：模块化多电平换流器 子模块拓扑 搜索方法 直流故障穿越能力 定量评估 

分 类 号：TM743[电气工程—电力系统及自动化]