摘要
模块化多电平换流器型高压直流输电系统(MMC-HVDC)各桥臂之间存在一定的环流,直接影响系统的稳定性.为了抑制环流,根据环流中二倍频分量特性,首先建立两相旋转坐标系下MMC的环流数学模型,然后设计能够抑制环流的比例谐振控制器(PR controller),并在此基础上增加桥臂电流反馈环节.最终,在PSCAD/EMTDC环境下搭建21电平MMC系统仿真模型,仿真结果表明,优化了PR控制器的性能,提高了系统的稳定性和环流快速抑制能力.
There is a certain circulation among the bridge arms of the modular multilevel converter high voltage dc transmission system(MMC HVDC), which directly affects the stability of the system. In order to restrain circulation, based on the characteristics of double frequency component, the two phase rotating coordinate system, the mathematical model of circulation of MMC is established under, and then the proportional resonant controller (PR controller) is designed which can restain the circulation, on thaat basis,the bridge arm current feedback is supplied. Finally, the simulation model of the 21 level MMC sys tern is built through the PSCAD/EMTDC environment, and the simulation results show that the perform ance of PR controller is optimized, and the stability of the system and the ability of rapid circulation sup pression are improved.
作者
周冠军
宋吉江
王晓晓
牛轶霞
ZHOU Guan-jun;SONG Ji-jiang;WANG Xiao-xiao;NIU Yi-xia(School of Electrical and Electronic Engineering,Shandong University of Technology,255049,Zibo,Shandong,PR)
出处
《曲阜师范大学学报(自然科学版)》
CAS
2018年第4期15-18,共4页
Journal of Qufu Normal University(Natural Science)
基金
山东省自然科学基金(ZR2015FLO34)
校城融合发展规划(2016ZBXC142)
关键词
MMC
二倍频谐波
环流抑制
两相旋转坐标系
PR控制器
MMC
double frequency harmonics
circulating current supression
two phase rotation co ordinate system
PR controller