摘要
模块化多电平换流器(modular multilevel converter,MMC)以其优越的整体性能在大规模电网互联等领域具有广泛的应用前景。文章首先分析了MMC系统的工作原理,并结合一种冗余配置方法来确定MMC桥臂级联子模块的最优数量。基于最近电平逼近调制(nearest level modulation,NLM)算法,提出一种冗余子模块优先充电的MMC电容电压均衡控制策略,确保冗余子模块电压水平能够保持最低允许值,从而实现与故障子模块的平稳切换。最后,基于PSCAD/EM TDC平台搭建M M C仿真系统,验证了文章提出的改进的电容电压均衡控制策略的有效性。
Because of the preferable performance,modular multilevel converters（MMCs） have a wide application prospect in some fields including large-scale interconnection of power grids. Firstly,this paper analyzes the operational principle of MMC system,and combines the method of redundant configuration to design the optimal quantity of submodules on MMC arms. And then,based on the nearest level modulation（NLM） algorithm,an improved control strategy for capacitor voltage balancing of MMC is proposed,in which redundant sub-module has the charging priority to ensure its voltage stay at the level higher than the lowest standard,so that failure sub-module may be replaced smoothly. Finally,the effectiveness of the proposed control strategy is verified through simulation in PSCAD/EM TDC.
作者
张天
姜斌
龚雁峰
ZHANG Tian;JIANG Bin;GONG Yanfeng(Jinan Power Supply Company, Jinan, 250012;North China Electric Power University, Beijing, 102206)
出处
《电力建设》
北大核心
2018年第5期38-45,共8页
Electric Power Construction
基金
中央高校基本科研业务费专项资金资助项目(2017XS015)~~
