基于混合子模块的MMC故障阻断及谐波特性分析  

Fault blocking and harmonic characteristic analysis based on hybrid sub-module of MMC

作　　者：王振浩[1] 宋金泊 韩子娇 张钊[2] 李国庆[1] WANG Zhenhao SONG Jinbo HAN Zijiao ZHANG Zhao LI Guoqing(School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China Liaoning Electric Power Company Limited, Shenyang 110006, China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]辽宁省电力有限公司,辽宁沈阳110006

出　　处：《电力系统保护与控制》2017年第8期73-79,共7页Power System Protection and Control

基　　金：2014国网公司科技项目<柔性环网控制器关键技术研究及示范应用>(2014GW-05)~~

摘　　要：针对模块化多电平换流器(MMC)所存在的直流侧故障无法自清除的问题,许多新型的子模块拓扑在原有半桥型子模块(HBSM)的基础上进行调整修正,利用其自身的拓扑特点,在直流侧发生短路故障时通过使短路电流给子模块电容充电的方法实现故障电流的快速阻断。在研究了众多新型子模块拓扑的基础上,设计了电流阻断能力较强的新型子模块。并考虑了损耗特性,采用新型子模块与HBSM结合的混合拓扑结构,从调制策略到谐波特性以及故障阻断性能进行了分析。推导了各次谐波电压幅值的表达式,并通过仿真验证了其准确性与实用性。In view of the problems that the modular multilevel converter （MMC） cannot clear the DC side fault, many of the new sub-module topologies are amended on the basis of the traditional half bridge sub-module （HBSM）, which uses their own topology characteristics to clear the fault current fast by making the capacitors of sub-modules charged via the fault current when short-circuit fault occurs on DC side. After researching large numbers of new sub-module topologies, this paper designs a new sub-module which ability of current blocking is relatively prominent. And considering the loss characteristics, a hybrid topology combined HBSM with new sub-module is adopted, which are analyzed from the aspects of modulation strategy, harmonic characteristic and properties of fault blocking. The expression of each harmonic voltage amplitude is deduced and the practicability is verified by simulation analysis.

关 键 词：模块化多电平换流器 新型子模块 调制策略 谐波特性 故障阻断 

分 类 号：TM46[电气工程—电器]