冷连轧过程中的厚度和张力系统具有多变量、强耦合和不确定特点,为了提高系统的控制精度和控制性能,提出了基于不变性原理解耦的H∞混合灵敏度鲁棒控制策略.首先,建立了厚度和张力系统的动态耦合模型,并应用不变性解耦原理实现了对厚度和张力系统的解耦.其次,针对系统存在的建模误差、参数摄动和外部扰动等不确定性,采用H∞混合灵敏度方法设计了鲁棒控制器来保证系统的鲁棒稳定性和鲁棒性能.仿真结果表明解耦后的厚度和张力系统可以获得更好的控制效果,验证了本算法的有效性. In the process of cold tandem rolling, the thickness and tension systems have the characteristics of multivariable, strong coupling and indeterminate. In order to improve the control accuracy and control performance of the system, a robust H∞ control strategy based on the invariance principle is proposed. Firstly, , A dynamic coupling model of thickness and tension system is established, and the decoupling of thickness and tension system is realized by using the invariance decoupling principle.Secondly, according to the uncertainties such as system modeling error, parameter perturbation and external disturbance , A robust controller is designed by using H∞ mixed sensitivity method to ensure the robust stability and robust performance of the system.The simulation results show that the decoupled thickness and tension system can achieve better control effect, Effectiveness.