Arm energy control strategy of modular multilevel converter based on model predictive control

作者：Lin, Huancheng; Wang, Zhixin

来源：Dianli Zidonghua Shebei/Electric Power Automation Equipment, 2018, 38(4): 44-51.

DOI：10.16081/j.issn.1006-6047.2018.04.007

• Arm energy
• Capacitor voltages
• Circulating current
• Control strategies
• Decoupling controls
• Model predictive controllers
• Modular multilevel converters
• Receding horizon optimization

Existing control strategies of MMC(Modular Multilevel Converter) mostly use given submodule capacitor voltage reference,which can not control the capacitor voltage of different arms separately. An arm energy control strategy for MMC based on model predictive control is proposed,which introduces common-mode and differential-mode component control of the arm energy to realize flexible control of the capacitor voltage of each arm. The model predictive controllers of phase current and circulating current are designed based on the transient mathematical model of MMC and the current error feedback receding horizon optimization is introduced,realizing the decoupling control of external phase current and internal circulating current effectively and making the circulating-current controller realize the characteristics of circulating-current restraining and circulating-current injection,and it is not sensitive to parameters of the system. Simulative results verify the validity and effectiveness of the proposed control stra-tegy.

• 出版日期2018
• 单位上海交通大学