摘要
在工程实践中采用两电平电压源换流器VSC(voltage source converter)和模块化多电平换流器MMC(modular muhilevel converter)的直流输电系统,各有优劣。若将其混合连接,扬长补短,可大大提高系统设计的灵活性和可靠性。鉴于此,该文提出了一种整流侧和逆变侧分别采用两电平VSC和MMC的向无源端供电混联结构直流输电HVDC(high voltage direct current)系统。该系统整流器采用具有LCL有源阻尼补偿的PI双闭环控制,逆变器采用具有有源阻尼补偿的反馈线性化控制。文中采用Matlab/Simulink仿真软件搭建了VSC两电平和MMC四电平混联系统模型,对有功、无功负荷增加两种工况进行了仿真。仿真结果表明,所设计控制器能有效稳定母线电压,并对负荷变化快速反应,可向无源端提供高质量电能。
There are both advantages and disadvantages in the HVDC transmission system based on two level voltage source converter and the one based on modular multilevel converter. If they are hybrid connected in engineering prac-tice,the flexibility and the reliability of system design can be greatly improved. Consequently,this paper proposes a hybrid structure HVDC system connected to passive network,which consisted of two-level voltage source rectifier（VSC）and modular multilevel inverter（MMC）. For supplying power to passive network,a dual closed loop controller based on PI and LCL active damping compensation was adopted on the rectifier side to improve the stability of DC bus.On the inverter side,a controller based on input-output variable feedback linearization with active damping compen-sation was designed to improve dynamic performance. The steady-state and dynamic performance of the proposed controllers under different operation conditions are shown by simulation of hybrid system based on two-level VSC and fourlevel MMC in Matlab/Simulink. Therefore,high-quality power supply of passive networks can be achieved by this proposed hybrid HVDC system.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第12期57-63,共7页
Proceedings of the CSU-EPSA
基金
国际科技合作项目(2011DFA62240)
关键词
混联结构
无源网络
模块化多电平换流器
高压直流输电
hybrid structure
passive network
modular multilevel converter（MMC）
high voltage direct current（HVDC）
