Observer-based dissipative control for networked control systems: A switched system approach

This article studies the problem of observer-based dissipative control problem for wireless networked control systems (NCSs). The packet loss and time delay in the network are modeled by a set of switches, using that a discrete-time switched system is formulated. First, results for the exponential dissipativity of discrete-time switched system with time-varying delays are proposed by using the average dwell time approach and multiple Lyapunov-Krasovskii function. Then, the results are extended to drive the controller design for considered wireless NCS. The attention is focused on designing an observer-based state feedback controller which ensures that, for all network-induced delay and packet loss, the resulting error system is exponentially stable and strictly (Q,S,R) dissipative. The sufficient conditions for existence of controllers are formulated in the form of linear matrix inequalities (LMIs), which can be easily solved using some standard numerical packages. Both observer and controller gains can be obtained by the solutions of set of LMIs. Finally, numerical examples are provided to illustrate the applicability and effectiveness of the proposed method. (c) 2014 Wiley Periodicals, Inc.