增强型柔性逆阻模块化多电平换流器的故障阻断特性分析  

Fault Blocking Performance Analysis of Enhanced Flexible Reverse Blocking Multilevel Modular Converter

作　　者：杨晓峰[1] 李泽杰 薛尧[1] 陈博伟[1] Yang Xiaofeng;Li Zejie;Xue Yao;Chen Bowei(School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China)

机构地区：[1]北京交通大学电气工程学院

出　　处：《电工技术学报》2019年第12期2549-2557,共9页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2016YFE0131700);中央高校基本科研业务费专项资金(2017JBZ101)资助项目

摘　　要：鉴于传统半桥型模块化多电平换流器(HBSM-MMC)无法阻断直流故障电流的不足,通过对半桥子模块进行改造并增加桥臂阻尼模块(BDM),提出一种增强型柔性逆阻MMC(EFRB-MMC)拓扑,就其故障阻断特性展开详细研究。首先,分析EFRB-MMC的工作原理和故障阻断机理,推导故障电流和钳位电压解析式;然后,在故障阻断时间和器件电气应力研究基础上,进一步提出EFRB-MMC的关键参数设计原则;最后,仿真结果证明上述理论的有效性。The traditional half-bridge sub-module based modular multilevel converter(HBSM-MMC)cannot block the DC fault current effectively.Thus an enhanced flexible reverse blocking MMC topology(EFRB-MMC)is proposed by improving the HBSMs and adding the bridge damping modules(BDMs).This paper focuses on its fault blocking performance analysis.Both operation principle and fault current limiting mechanism analysis of EFRB-MMC are carried out firstly,and the analytical formula of fault current and clamp voltage are further derived in detail.Moreover,based on the analysis of fault blocking time and device electrical stress,the design principles of key parameters of EFRB-MMC are further proposed.Finally,the simulation results show the effectiveness of the proposed topology.

关 键 词：模块化多电平换流器 故障阻断 增强型 柔性逆阻子模块 桥臂阻尼模块 

分 类 号：TM46[电气工程—电器]