采用逆阻型子模块的新型模块化多电平换流器  

Novel Modular Multilevel Converter With Reverse Blocking Sub-modules

作　　者：杨晓峰[1] 薛尧[1] 郑琼林[1] 林智钦[1] 牟雅洁 陈博伟[1] 五十岚征辉 

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]富士电机系统株式会社

出　　处：《中国电机工程学报》2016年第7期1885-1891,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207008);中央高校基本科研业务费人才基金(2014RC013)~~

摘　　要：模块化多电平换流器(modular multilevel converter,MMC)是高压直流输电系统领域中极具工程应用前景的电压源拓扑之一。在分析典型子模块拓扑特点的基础上,该文提出一种新型的逆阻型半桥子模块(reverse blocking half bridge sub-module,RB-HBSM)的MMC拓扑,用于解决传统MMC的故障穿越能力问题。开展了RB-HBSM及其构成的MMC拓扑的故障电流阻断机理及其主要功率开关器件的电气应力分析研究,提出了故障控制流程,最后通过仿真算例对所提出的子模块拓扑进行了验证。仿真结果表明,新型RB-HBSM-MMC拓扑在不改变原有控制策略与调制策略的情况下,能够迅速实现故障电流阻断效果,有助于进一步降低系统的复杂程度。Modular multilevel converter（MMC） is one of the promising voltage source converter topologies in the field of high voltage direct current（HVDC） transmission system. Based on analysis of the existing sub-module topologies, an improved half-bridge sub-module topology based on reverse blocking IGBTs（RB-HBSM） was proposed for solving the fault ride through issues. In this paper, the fault current blocking mechanism and the electrical stress of the main power switches were studied firstly in detail. Then the fault control flow chart was presented. Feasibility of the proposed sub-module topology and the fault protection theory were verified by simulation. The proposed RB-HBSM-MMC topology is able to block the fault current without changing the original control and modulation strategies compared with the conventional MMC, thus it further reduces the complicity of industry design.

关 键 词：模块化多电平换流器 子模块 逆阻型 故障隔离 高压直流输电 

分 类 号：TM46[电气工程—电器]