An Optimized Capacitor Voltage Balancing Method for Modular Multilevel Converter

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering

Ding, Jincheng^1 ; Wang, Zhenshu^1 ; Wu, Chen^1 ; Du, Zixuan^1

School of Electrical Engineering, Shandong University, Jinan

250000, China^1

关键词: Capacitor voltage balancing;    MATLAB /simulink;    Modular multi-level converters;    Sorting method;    Submodules;    Upper limits;    Voltage balancing;    Voltage difference;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/394/4/042082/pdf
DOI  :  10.1088/1757-899X/394/4/042082

来源: IOP

【 摘 要 】

The problem of voltage balancing among the submodules (SM) in modular multilevel converter (MMC) urgently needs to be solved. This paper compares traditional voltage balancing method with the sorting method based on two maintaining factors in terms of voltage balancing effects and switching frequency. Upper limits of voltage difference are set in a gesture to combine these two methods, which can realize the balance between voltage balancing effects and switching frequency. The model of MMC with 20 submodules on each arm is realized by MATLAB/Simulink, and the improved method is verified. The simulation results demonstrate that the improved method is reasonable and effective.