摘要
直流线路的弱惯性使得柔性直流输电系统换流站间存在复杂的耦合关系,需设计换流站间解耦控制器以弱化换流站间的交互作用。为此,首先建立柔性直流输电系统小信号数学模型,然后依据S/T/KS混合灵敏度H∞鲁棒控制原理,推导了柔性直流输电系统站间解耦控制器,并采用基于互质因子模型的均衡截项法及经典控制理论的降阶方法将高阶控制器降到了合适阶数,以利于工程应用。最后进行电磁暂态仿真,验证了所设计的站间解耦控制器能有效削弱两端换流站的交互作用,提高系统动态性能并兼顾了鲁棒稳定性。
The weak inertia of DC line ensures the existence of a complex coupling relationship between converter stations in VSC-HVDC,thus an inter-station controller is needed to weaken the interaction.Firstly,an exact small-signal mathematical model of flexible HVDC transmission system is established,and the global state space equation is obtained.Then,according to the H∞robust control principle of S/T/KS mixed sensitivity,an appropriate weight function is selected and the decoupling controller between stations of flexible HVDC transmission system is deduced.The high-order controller is reduced to an appropriate order by using the equilibrium truncation method based on the mutual prime factor model and the reduction method of classical control theory,which is beneficial to engineering application.Finally,the electromagnetic transient simulation is carried out to verify that the decoupling controller between stations can be effectively weakened the interaction between two converter stations and improves the dynamic performance and robust stability of the system.
作者
余瑜
李鸿亮
陈启江
田野
徐立超
吕爽
YU Yu;LI Hongliang;CHEN Qijiang;TIAN Ye;XU Lichao;LÜShuang(Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430068,China;China City Environment Protection Engineering Limited Company,Wuhan 430071,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第5期1702-1710,共9页
High Voltage Engineering
基金
湖北省自然科学基金(2017CFB298)。
关键词
VSC-HVDC
小信号模型
H∞控制
交互作用
站间解耦控制
VSC-HVDC
small-signal model
H-infinity control
interaction effect
decoupling control between stations
