Capacitor Voltage Equalization Strategy of MMC System Based on Switching State Matrix

被引：0
|
作者：
Yu X. [1 ]
Liu K. [1 ]
Zhou Y. [1 ]
Qin L. [1 ]
机构：
[1] School of Electrical Engineering and Automation, Wuhan University, Wuhan
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 03期
基金：
中国国家自然科学基金;
关键词：
capacitor voltage equalization; group rotation; modular multilevel converter; static operating point; switching state matrix; uniform asymptotic stability;
D O I：
10.13336/j.1003-6520.hve.20212049
中图分类号：
学科分类号：
摘要：
In order to establish the theoretical basis of self balancing of modular multilevel converter (MMC), the MMC state space model is constructed, and the uniform asymptotic stability of MMC capacitor voltage is proved. The static operating point of MMC capacitor voltage under unbalanced state is studied, and the correlation between the rank of switching state matrix and the static operating point of MMC capacitor voltage is revealed. Based on the self balancing theory of switching state matrix, to solve the problem of slow rotation speed when the control frequency is low or the number of sub modules is large, a capacitor voltage balancing control strategy based on grouping rotation of switching state matrix is proposed, which can effectively reduce the fluctuation rate of capacitor voltage. Finally, the MMC electromagnetic transient simulation model is built in Matlab/Simulink to verify the correctness of the verified conclusions and the effectiveness of the proposed method. © 2023 Science Press. All rights reserved.
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页码：1314 / 1327
页数：13
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