Feedback and Feedforward Tracking Control for Networked Control Systems

Abstract— In this paper, we investigate the feedback and feedforward tracking control problem for networked control systems under the discrete-time framework. The network-induced delays both on the network links from sampler to the controller and from the controller to the actuator are considered. By studying the network property, we assume that there is a probability for the occurrence of each delay within a known set. We design a controller for each network-induced delay. Using the lifting technique twice, the tracking problem of the networked control systems is transferred to a feedback control problem for stochastic systems without delays. The stochastic stability and H∞ performance of the obtained closed-loop stochastic systems are both studied, and the criteria are given via a linear matrix inequality and a linear matrix equality. The controller design approach is proposed by solving a nonlinear trace minimization problem.