Energy-balancing Control Strategy for Modular Multilevel Converters Under Submodule Fault Conditions

被引:145
作者
Hu, Pengfei [1 ]
Jiang, Daozhuo [1 ]
Zhou, Yuebin [1 ]
Liang, Yiqiao [1 ]
Guo, Jie [1 ]
Lin, Zhiyong [1 ]
机构
[1] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
关键词
Energy-balancing control strategy; modular multilevel converters (MMCs); prototype; redundant submodules (SMs); submodule (SM) fault;
D O I
10.1109/TPEL.2013.2284919
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];
摘要
The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage and high-power applications. This paper focuses on the design and control methods for fault-tolerant operation using redundant submodules (SMs), which is one of the most important features in the MMC topology. By comparing three design schemes of redundant SMs, the most economic and reliable scheme is identified. In addition, a mathematical model of the MMC with arms containing different numbers of SMs is developed. Based on the identified scheme and mathematical model, an energy-balancing control strategy is proposed to keep the MMC operating normally under SM fault conditions. Finally, time-domain simulations of a 61-level MMC system are performed, using the PSCAD/EMTDC software, while experiments are carried out on a 41-level MMC prototype. The simulation and experimental results validate the design scheme, mathematical model, and proposed energy-balancing control strategy.
引用
收藏
页码:5021 / 5030
页数:10
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