电力系统及其自动化学报2017，Vol.29Issue(6)：21-28,8.DOI:10.3969/j.issn.1003-8930.2017.06.004
新型模块化多电平变流器容错运行策略
Novel Fault-tolerant Operation Strategy for Modular Multilevel Converter
摘要
Abstract
In order to solve the problems of modular multilevel converter(MMC)under sub-module fault,such as cur-rent distortion,larger capacitive voltage ripple and too-large DC current fluctuation,a novel fault-tolerant operation strategy for MMC is presented in this paper to improve the fault-tolerant operation capability of the system. According to different ranges of modulation ratio,the modulation wave is adjusted appropriately. Furthermore,a modulation strategy is put forward on the basis of carrier phase-shift modulation(CPSM),which replaces the fault modules with current shutdown modules,and the corresponding optimization method is also given. In this way,the average switching-on time of normal module in bridges is prolonged,the bridge energy is kept unchanged and the asymmetry of bridges is reduced. The simulation and experimental verifications in MATLAB/Simulink are realized,and results show that the proposed fault-tolerant operation strategy can improve the output waveforms of MMC under fault,reduce the distortion rate and in-crease the fault ride-through capability of MMC,which is helpful to the stable and reliable operation of MMC system.关键词
模块化多电平变流器/载波移相调制/调制波重构/故障穿越能力Key words
modular multilevel converter(MMC)/carrier phase-shift modulation(CPMS)/modulated wave reconstruc-tion/fault ride-through capability分类
信息技术与安全科学引用本文复制引用
荣飞,刘诚,黄守道..新型模块化多电平变流器容错运行策略[J].电力系统及其自动化学报,2017,29(6):21-28,8.基金项目
国家重点研究发展计划(973计划)资助项目(2016YFB0901001) （973计划）
