具有交流源完全阻断能力的混合式MMC拓扑  

Hybrid MMC topology with complete AC-side source blocking capability

作　　者：李仲青[1] 何佳伟[1] 李永丽[1] 李伟[2] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]中国电力科学研究院电网安全与节能国家重点实验室.北京100192

出　　处：《电力自动化设备》2018年第3期96-101,共6页Electric Power Automation Equipment

基　　金：国家重点研发并划智能电网技术与装备重点(2016.YFB0900600);国家电网公司科技项目(52094017000W)

摘　　要：在具有直流故障清除能力的多种模块化多电平换流器(MMC)子模块中,箝位双子模块投资成本和附加损耗最低,但是交流源阻断能力相对较弱;串联双子模块和增强自阻型子模块交流源阻断能力足够强,但是投资成本和附加损耗较大。结合不同类型子模块所具备的不同优势,设计了一种混合式MMC拓扑结构。以闭锁后交流源完全阻断为约束,以投资成本、附加损耗最低为目标,提出了子模块数量的混合配置原则。基于MATLAB/Simulink仿真平台搭建相应的基于不同子模块的柔性直流系统模型,通过大量的仿真测试验证了理论分析的正确性以及所设计的混合式MMC拓扑的可行性。In several kinds of MMC（Modular Multilevel Converter） sub-modules with DC fault eliminating capability,the clamp double sub-module has the lowest investment cost and additional power loss but relatively weaker AC-side source blocking capability,nevertheless,the series double sub-module and self-blocking sub- module have strong enough AC-side source blocking capability but high investment cost and additional power loss. According to the different advantages of different sub-modules,a hybrid MMC topology is de- signed. Taking the requirement of the complete AC-side source blocking as the constraints and the lowest investment cost and additional power loss as the objectives,the sub-module number calculation principle is proposed. The simulation models of flexible DC system based on different sub-modules are built with MATLAB/Simulink,and the simulative results verify the correctness of theoretical analysis and the feasibility of the proposed hybrid MMC topology.

关 键 词：柔性直流系统 模块化多电平换流器 故障隔离 交流源阻断 混合式拓扑 

分 类 号：TM46[电气工程—电器]