电力系统保护与控制2012，Vol.40Issue(24)：118-124,7.
模块化多电平换流器不平衡环流抑制研究
Study of unbalanced circular current suppressing for modular multilevel converter
摘要
Abstract
As to suppress three-phase circulating current in MMC under unbalanced condition, first, power analysis and network decomposition are made. Then, a method is proposed to simplify four sequence networks of MMC inverter under unbalanced condition to positive and negative network by controlling the active power constant of inverter exit side. Third, mechanism and dynamic performance of circulating current in negative networks are further discussed, and the method of transforming three-phase circulating current to direct component through positive sequence frequency doubling rotation transformation is put forward. Last, combined with the conclusions about positive-sequence circulating current characteristics and suppressing control method in existing references, a novel design of unbalanced circular current suppressing controller for MMC based on double synchronous rotating coordinate transform is obtained. The reported simulation results of 61 levels modular converters confirm that the proposed circulating current suppressing controller can both keep the normal operation of MMC under unbalanced condition and suppress the inner circulating current on the premise of not increasing the current-limiting reactance of bridge arm.关键词
模块化多电平换流器(MMC)/不平衡工况/双同步旋转坐标变换/环流抑制器Key words
modular multilevel converter (MMC)/ unbalanced condition/ decoupled synchronous transformation/ circulating current suppressing controller分类
信息技术与安全科学引用本文复制引用
卓谷颖,江道灼,连霄壤..模块化多电平换流器不平衡环流抑制研究[J].电力系统保护与控制,2012,40(24):118-124,7.基金项目
国家高技术研究发展计划(863计划)资助项目(2008AA05Z213) （863计划）
