Observer-based compensator design for networked control systems with long time delays

Network-induced delays in the networked control systems (NCS) are inevitable and have a significant effect on system performance. In this paper, time-varying delays are regarded as the sum of the mean delays and uncertain delays. Furthermore, NCS with long time delays is modelled as a discrete-time model with structural uncertainty for its time-varying network-induced delays. Based on the model, a new control law via an iterative linear matrix inequality (LMI) approach is presented which can stabilize the closed-loop system. Theoretical analysis and simulation results compared to some existing schemes show that the control strategy presented in this paper is effective and feasible.