A Level-Increased Nearest Level Modulation Method for Modular Multilevel Converters

被引:244
作者
Hu, Pengfei [1 ]
Jiang, Daozhuo [1 ]
机构
[1] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
关键词
Modular multilevel converters (MMCs); nearest level modulation (NLM); prototype; 2N+1 level;
D O I
10.1109/TPEL.2014.2325875
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 emerging to be a promising approach for medium-and high-voltage applications. This paper proposes a modified nearest level modulation (NLM) method for the MMC, with which the level number of ac output voltage increases to 2N + 1 (where N is the submodule numbers per arm) as great as that of the carrier-phase-shifted PWM and the improved submodule unified PWM methods. The level number is almost doubled and the height of the step in the step wave is halved. Therefore, the ac output voltage waveform quality using the proposed method is better than that using the conventional NLM method. Besides, the proposed method keeps the conventional NLM method's characteristics such as low switching frequency and simple implementation. The performance of the proposed method is verified by simulations and experiments using a laboratory-scale prototype.
引用
收藏
页码:1836 / 1842
页数:7
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