A Capacitor Voltage Balancing Control Method for Modular Multilevel Converter Based on Insertion Priority of the Sub-modules

被引：0

作者：

Gou X. ^{[1
]}

Lu J. ^{[1
]}

Liu J. ^{[1
]}

Xu Y. ^{[1
]}

He Q. ^{[2
]}

机构：

[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology(Chongqing University), Shapingba District, Chongqing

[2] Dispatch Control Center of State Grid Chongqing Electric Power Company, Yuzhong District, Chongqing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 24期

基金：

中国国家自然科学基金;

关键词：

Allowable voltage distribution band; Insertion priority; Modular multilevel converter(MMC); Switching frequency; Voltage balancing control;

D O I：

10.13334/j.0258-8013.pcsee.182474

中图分类号：

学科分类号：

摘要：

Aiming at the computation complexity and high switching frequency existing in conventional voltage balancing method of high-level modular multilevel converter, a novel voltage balancing method based on insertion priority of sub-modules(SMs) was proposed. Instead of sorting the voltage values of SMs, the allowable voltage distribution band(AVDB) was applied to constrain the voltage distribution of SMs. The insertion priorities of each SM in current control cycle were determined by comparing the voltage values of SMs switched IN or OUT in last control cycle with the upper and lower limits of AVDB respectively. Then the serial number vector of SMs was rearranged according to the high-to-low priority rule, and the corresponding number of SMs at the forefront of the vector was selected to insert. Furthermore, the quantity relationship of SMs among each priority was analyzed, and the basis for determining the upper and lower limits of the voltage dispersion threshold was given. The simulation results based on MATLAB/Simulink show that the proposed method can reduce the switching frequency of power devices significantly when maintaining high capacitor voltage consistency, whether in steady or transient process. © 2019 Chin. Soc. for Elec. Eng.

引用

页码：7299 / 7310

页数：11

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