摘要
通过对三相三线制模块化多电平换流器(MMC)进行数学建模,得到其网侧电流、环流、直流侧中点电位3个关键电气参量与桥臂电压不同分量之间的对应关系,并在对称稳态下分析了上述电气量所包含的谐波特征分量,提出了MMC网侧电流、环流交流分量和直流侧中点电位的解耦控制方法。仿真结果表明,提出的控制方法简单有效,可实现对网侧电流、环流交流分量和直流侧中点电位的解耦控制;各桥臂电气量保持对称,MMC可保持长期平稳运行。
By setting up a mathematical model of a three-phase three-wire modular multilevel converter （MMC）, the correspondence relationship between the AC side current,circulating current and neutral point potential of DC side and the different components of arm voltages is obtained and the harmonics contained in the above-mentioned electrical quantities in symmetric steady-state are analyzed.A decoupled control method of AC side current,the AC component of circulating current and the neutral point potential of DC side is proposed.Simulation results show that the control method proposed is simple and effective,the decoupled control of AC side current,the AC component of circulating current and the neutral point potential of DC side is verified,and the electrical quantities of different arms remain symmetric,contributing to long-term stable operation of MMC.
出处
《电力系统自动化》
EI
CSCD
北大核心
2015年第3期110-116,共7页
Automation of Electric Power Systems
基金
国家高技术研究发展计划(863计划)资助项目(2012AA050215)
国家自然科学基金青年基金资助项目(51107065)~~
关键词
模块化多电平换流器
三相三线制
环流
直流侧中点电位
解耦控制方法
modular multilevel converter （MMC）
three-phase three-wire
circulating current
neutral point potential of DCside
decoupled control method
