A Capacitor Voltage Balancing Control Method for Modular Multilevel Converter Based on Variable Threshold Interval Sub-modules Grouping

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	A Capacitor Voltage Balancing Control Method for Modular Multilevel Converter Based on Variable Threshold Interval Sub-modules Grouping
	Wang C(王臣)2; Wang AN(王安娜)2; Zhang T(张涛)1,3,4,5; Zhang HL(张华良)1,4,5
	2021
会议日期	May 7-10, 2021
会议地点	Chengdu, China
关键词	modular multilevel converter voltage balance of capacitance voltage threshold range comparison of variable reference value switching frequenc
页码	597-602
英文摘要	The sub-module capacitor voltage equalization of modular multilevel converters is the key to their stable operation. Aiming at the computation complexity and high switching frequency existing in conventional voltage balancing method of high-level modular multilevel converter, an optimal equalization control strategy based on sub-modules(SMs) priority with variable threshold interval is proposed. The number of current input modules is calculated by the nearest level modulation, then the reference value is adjusted according to the number of input modules, and based on this reference value, sets the SMs capacitance voltage threshold range to constrain the voltage distribution of SMs. The grouping order 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 threshold interval. According to the direction of the bridge arm current, the sequencing order of the groups is determined, and the information of the input module is finally determined. A simulation model of three-phase inverter based on MMC is set up in MATLAB/Simulink to verify the proposed strategy can reduce the switching frequency of power devices significantly when maintaining high capacitor voltage consistency, whether in steady or transient process.
源文献作者	IEEE
产权排序	2
会议录	2021 IEEE 4th International Conference on Electronics Technology, ICET 2021
会议录出版者	IEEE
会议录出版地	New York
语种	英语
ISBN号	978-1-7281-7673-4
内容类型	会议论文
源URL	[http://ir.sia.cn/handle/173321/30070]
专题	沈阳自动化研究所_工业控制网络与系统研究室
通讯作者	Wang AN(王安娜)
作者单位	1.Key Laboratory of Networked Control Systems, Chinese Academy of Sciences, Shenyang China 2.College of Information Science and Engineering ,Northeastern University, Shenyang China 3.School of Electrical Engineering, Dalian University of Technology, Dalian China 4.Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang China 5.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang China
推荐引用方式 GB/T 7714	Wang C,Wang AN,Zhang T,et al. A Capacitor Voltage Balancing Control Method for Modular Multilevel Converter Based on Variable Threshold Interval Sub-modules Grouping[C]. 见:. Chengdu, China. May 7-10, 2021.