| 引用本文: | 马文忠,孙远博,王玉生,张文艳,李恒硕,朱亚恒.基于子模块顺序移位的MMC电容电压平衡策略[J].电力自动化设备,2026,46(1):179-184 |
| MA Wenzhong,SUN Yuanbo,WANG Yusheng,ZHANG Wenyan,LI Hengshuo,ZHU Yaheng.Capacitor voltage balancing strategy for MMC based on sub-module sequential shifting[J].Electric Power Automation Equipment,2026,46(1):179-184 |
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| 摘要: |
| 模块化多电平换流器(MMC)子模块(SM)电容电压平衡决定系统能否安全稳定运行。针对传统电压排序法运算量大的问题，提出一种无需电压排序的SM电容电压平衡策略。按照系统中SM位置顺序，为了输出期望波形投入相应数量SM，对SM进行充放电。为了实现SM电压平衡，根据SM电容电压状态，提出了SM顺序前移和后移2种移位策略，并根据电容电压差值与所设定阈值更换SM投切顺序。在MATLAB/Simulink平台和硬件在环系统中对所提策略进行验证。结果表明，所提策略复杂度低，运算量小，有效降低了SM的开关频率。 |
| 关键词: MMC SM；电容电压平衡；运算复杂度；开关频率 |
| DOI：10.16081/j.epae.202505019 |
| 分类号:TM46 |
| 基金项目:国家自然科学基金资助项目(52277208) |
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| Capacitor voltage balancing strategy for MMC based on sub-module sequential shifting |
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MA Wenzhong1, SUN Yuanbo1, WANG Yusheng2, ZHANG Wenyan1, LI Hengshuo1, ZHU Yaheng1
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1.Institute of New Energy, China University of Petroleum(East China),Qingdao 266580, China;2.Planning & Engineering Institute of PetroChina Co.,Ltd.,Beijing 100083, China
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| Abstract: |
| The capacitor voltage balance of sub-module(SM) in modular multilevel converter(MMC) determines whether the system can operate safely and stably. Aiming at the issue of large computational burden in traditional voltage ranking method, a SM capacitor voltage balancing strategy without the need for voltage ranking is proposed. In accordance with the sequence of SM positions in the system, the corresponding number of SMs is activate based on the desired output waveform, and then the corresponding SMs are charged and discharged. To achieve SM capacitor voltage balancing, based on the SM capacitor voltage states, two shifting strategies, namely SM sequential forward-shifting and backward-shifting, are proposed. Based on the difference in capacitor voltages and the set threshold values, the switching sequences of SM are adjusted. The proposed strategy is verified in MATLAB/Simulink platform and hardware-in-the-loop system. The results show that the proposed strategy has low complexity, requires little computation, and effectively reduces the switching frequency of SMs. |
| Key words: MMC SM capacitor voltage balancing computational complexity switching frequency |
