基于附加导通模块的混合MMC子模块电容均压策略  

Capacitor voltage equalization strategy of hybrid MMC submodules based on additional conduction module

作　　者：曾子安 王子江 许洵 武一鸣 粟子健 樊友平[1] ZENG Zian;WANG Zijiang;XU Xun;WU Yiming;SU Zijian;FAN Youping(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《武汉大学学报(工学版)》2025年第1期76-83,共8页Engineering Journal of Wuhan University

基　　金：国家重点研发计划项目(编号:2023YFF0612200)。

摘　　要：针对传统均压策略在大容量高压直流输电中存在功率器件开关频率高等问题,提出了一种基于附加导通模块的混合模块化多电平换流器子模块电容均压策略。该策略以电压偏差不平衡度为判据,对超限的子模块进行轮换,并在此基础上设计了不平衡度自适应控制器,以提高该策略对于不同工况的适应度。仿真结果显示,相比现有策略,该策略不仅降低了开关频率,还改善了均压效果,更好地平衡了两者的矛盾,而且对不同程度负载的适应度有所提高,为我国特高压直流输电工程发展提供了一定的参考价值。In view of that the traditional voltage balancing strategy has the problem of high switching frequency of power devices in high-capacity high voltage direct current(HVDC)transmission,a hybrid modular multilevel converter(MMC)submodule capacitor voltage balancing strategy based on additional conduction module is proposed in this paper.The strategy takes the unbalance degree of voltage deviation as the criterion to rotate the submodules that exceed the limit.On this basis,an unbalance degree adaptive controller is designed to improve the adaptability of this strategy to different working conditions.The simulation results show that compared with the existing strategies,this strategy not only reduces the switching frequency,but also improves the voltage equalization effect,better balances the contradiction between the two,and improves the adaptability to different levels of load,which provides a certain reference value for the development of UHVDC transmission projects in China.

关 键 词：混合模块化多电平换流器 电容均压 附加导通模块 开关频率 电压偏差不平衡度 

分 类 号：TM732[电气工程—电力系统及自动化]