A Medium-Voltage Motor Drive with Modular Multilevel Converter Based on Nearest Level Modulation
Yi Lingzhi1, Huang Xiaohui1,2, Huang Shoudao2, Rong Fei2, Liu Luo1
1. Hunan Province Engineering Research Center for Multi-Energy Collaborative Control TechnologyXiangtan University Xiangtan 411105 China; 2. College of Electrical and Information Engineering Hunan University Changsha 410082 China
Abstract：Nearest level modulation (NLM) is the most commonly used modulation method for modular multilevel converter (MMC). When the number of levels is small, the output voltage and current harmonics of the NLM are severely distorted, and it cannot be used in MMC based medium-voltage motor drive system. In this paper, the switching process of the deadbeat current control under NLM is analyzed in detail, and it is pointed out that the MMC deadbeat current control under NLM modulation has hysteresis characteristics. The hysteresis loop width of MMC deadbeat current control under NLM is quantitatively analyzed, and the expression of hysteresis loop width and output current fluctuation range is obtained. At the same time, the integrated control scheme of MMC based motor drive system is designed. Compared with the traditional scheme, the proposed scheme has the advantages of simple control structure, low switching frequency, easy realization of circulating current suppression and good dynamic characteristics. The 11-level back-to-back MMC motor drive model was built in Matlab/Simulink to verify the correctness and effectiveness of the proposed control scheme.
易灵芝, 黄晓辉, 黄守道, 荣飞, 刘罗. 基于最近电平逼近调制的模块化多电平变换器中高压变频调速系统运行控制[J]. 电工技术学报, 2020, 35(6): 1303-1315.
Yi Lingzhi, Huang Xiaohui, Huang Shoudao, Rong Fei, Liu Luo. A Medium-Voltage Motor Drive with Modular Multilevel Converter Based on Nearest Level Modulation. Transactions of China Electrotechnical Society, 2020, 35(6): 1303-1315.
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2020, Vol. 35 
