中国电机工程学报2011，Vol.31Issue(12)：9-14,6.
MMC型VSC-HVDC系统电容电压的优化平衡控制
Optimized Capacitor Voltage Balancing Control for Modular Multilevel Converter Based VSC-HVDC System
摘要
Abstract
This paper investigated the capacitor voltage balancing problem of the modular multilevel converter (MMC) and the charge and discharge process of sub-module capacitors. The requirement to reduce the switching frequency of power electronic devices is not satisfied in the conventional capacitor voltage balancing control, since it results in high switching losses. To solve this problem, an optimized capacitor voltage balancing control for MMC based VSC-HVDC transmission system was proposed. The optimized voltage balancing control focuses on the sub-modules whose capacitor voltage exceeds the limits, while the switching states of the other sub-modules are maintained to some degrees by employing the maintaining factor. Therefore, the switching frequency of the power electronic device is reduced. The performance of the optimized capacitor voltage balancing control was evaluated with a time-domain simulation in PSCAD/EMTDC. The simulation results show that the optimized voltage balancing control, compared with the conventional one, can more significantly reduce the switching frequency of power device, without noticeablly increasing the capacitor voltage ripples.关键词
电压源换流器/电压源换流器型直流输电/模块化多电平换流器/子模块/电容电压平衡/保持因子分类
信息技术与安全科学引用本文复制引用
管敏渊,徐政..MMC型VSC-HVDC系统电容电压的优化平衡控制[J].中国电机工程学报,2011,31(12):9-14,6.基金项目
"十一五"国家科技支撑计划重大项目(2006BAA02A21). （2006BAA02A21）
