文档介绍：: .
高电压技术 电容电压的一致渐进稳定性。研究了 MMC 电容电压非均衡状态下的静态工作点，
揭示了投切状态矩阵的秩和 MMC 电容电压静态工作点之间的关联。基于投切状态矩阵自平衡理论，针对控制频
率较低或子模块数量较多时轮换速度慢的问题，提出了一种基于投切状态矩阵分组轮换的电容电压均衡控制策略，
能够有效降低电容电压的波动率。最后，在 Matlab/Simulink 中搭建了 MMC 电磁暂态仿真模型，验证了所证结
论的正确性和所提方法的有效性。
关键词：模块化多电平变流器；一致渐进稳定性；静态工作点；电容电压均衡；投切状态矩阵；分组轮换
Capacitor Voltage Equalization Strategy of MMC System Based on Switching State Matrix
YU Xue, LIU Kaipei, ZHOU Yiyuan, QIN Liang
( School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072)
Abstract: 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 ca-
pacitor 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, aiming
at 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.
Key words：modular multilevel converter; uniform asymptotic stability;