| Preview control is a control method that can significantly improve the system operation efficiency,it improves system performance by making full use of reference information or interference information that we can get.The study of preview control has gone deep into various control systems,and has achieved a series of important research results.In the field of practical engineering,the theory research of using previewable information to improve the tracking performance of control system has a wide range of application background.More and more researchers focus on the use of preview control in various control systems for tracking purposes.Since the phenomena of delay and uncertainty are unavoidable in practical systems and important factors that undermine the stability of the system,it is worth studying deeply to introduce the preview control theory into several discrete systems with time delay.In this paper,the effect of time-varying time delay on system stability is first considered in polytopic uncertain system,and the problem of parameter-dependent preview tracking control of uncertain time-varying time delay system is described.An output feedback controller with preview action is given,and the relation between pre-viewable length and tracking performance is discussed.Then,the method of preview tracking control is extended to 2D system,and it is introduced that 2D system can track the surface reference signal by designing the preview controller in two indepen-dent directions(usually called vertical and horizontal)with the dynamic characteristics simultaneously.Meanwhile,the design method of preview controller for 2D system is applied to 2D time-delay system,and LMI conditions of 2D delay discrete system based on Roesser model and state feedback controller of previewable information feedforward compensation are given. |
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