基于H_∞回路成形法的VSC-HVDC附加鲁棒阻尼控制器设计  

Design of additional robust damping controller for VSC-HVDC based on H_∞ loop shaping

作　　者：李志晗 张英敏[1] 李兴源[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《电力系统保护与控制》2018年第2期124-130,共7页Power System Protection and Control

基　　金：国家电网公司科技项目(SGQHJY00GHJS1400044)~~

摘　　要：针对包含柔性直流(VSC-HVDC)的交直流输电系统中存在的低频振荡问题,提出一种基于H_∞回路成形法的方法设计附加鲁棒阻尼控制器。首先采用最小二乘-旋转不变方法(TLS-ESPRIT)辨识出系统的降阶模型和振荡模态,然后针对该模型应用H∞回路成形法及规范互质分解技术进行了鲁棒阻尼控制器设计。最后在PSCAD/EMTDC中搭建包含柔性直流的交直流四机两区域输电系统。仿真结果表明,基于H_∞回路成形法的VSC-HVDC鲁棒阻尼控制器在不同扰动下对系统低频振荡具有良好的抑制效果,鲁棒性较强,且控制器采用输出反馈,便于工程实践。For the phenomenon of low frequency oscillation in the AC-DC interconnected system which contains VSC-HVDC, a method based on H∞ loop shaping is proposed to design the additional robust damping controller. The reduced order model of the system and the related oscillation frequency are identified by total least squares-estimation on signal parameters via rotational invariance techniques. The robust damping controller is designed for the reduced order model of the system based on H_∞ loop shaping and normalized coprime factorization. Finally, a simulation created in PSCAD/EMTDC which is a four-machine two-area system with a VSC-HVDC link. The results show that the robust damping controller designed for VSC-HVDC can well suppress the low frequency oscillation of the system in different disturbances. The controller shows good control performance and strong robustness; furthermore, output feedback control is utilized in the design of the controller, being convenient for practical application.

关 键 词：柔性直流 最小二乘-旋转不变技术 鲁棒阻尼控制 H∞回路成形 低频振荡 

分 类 号：TM712[电气工程—电力系统及自动化] TM72