摘要
控制系统对于柔性直流输电系统的运行性能起着至关重要的作用,因此对控制策略的研究有着重要的意义。推导了基于两相静止坐标系的模块化多电平换流器高压直流输电(modular multilevel converter-high voltage direct currenttransmission,MMC-HVDC)系统的数学模型,再结合比例谐振(proportional resonant,PR)控制器的特性,提出了基于两相静止坐标系的MMC-HVDC系统稳态控制策略。该策略避免了两相旋转坐标系中的电流交叉耦合项,不需要前馈解耦,整个控制系统更加简单。在电磁暂态仿真软件PSCAD/EMTDC中对上述控制策略进行仿真研究,仿真结果验证了所提策略的正确性与有效性。
Control system plays crucial role in the operation of flexible high voltage direct current transmission system, so it is significant to research its control strategy. A two-phase stationary reference frame-based mathematical model of modular multilevel converter-high voltage direct current （MMC-HVDC） transmission system is deduced, and combining with the characteristics of proportional resonant （PR） controller a steady-state control strategy for two-phase stationary reference frame-based MMC-HVDC transmission. system is proposed. In the proposed control strategy the cross-coupled term of current in tw0-phase stationary reference frame is avoided, thus the feed-forward decoupling is not needed and it makes the whole control system simpler. The proposed control strategy is simulated in the environment of PSCAD/ EMTDC and simulation results show that the proposed control strategy is correct and effective.
出处
《电网技术》
EI
CSCD
北大核心
2013年第5期1384-1388,共5页
Power System Technology
基金
国家自然科学基金项目(51177042)
"十一五"国家科技支撑计划重大项目(2010BAA01B01)~~
关键词
模块化多电平换流器
两相静止坐标系
比例谐振控制
modular multilevel converter
two-phasesstationary reference frame
proportional resonant control
