Fault estimation and tolerant control for discrete-time switched systems with sojourn probabilities

This paper addresses the issue of fault estimation and accommodation for a discrete-time switched system with actuator faults. Here, we assume that the sojourn probabilities are known a priori. By using the reduced-order observer method, the sojourn probability approach, and the Lyapunov technique, a fault estimation algorithm is obtained for the considered system. The main objective of this work is to design a dynamic output feedback fault-tolerant controller based on the obtained fault estimation information such that the closed-loop discrete-time switched system with available sojourn probabilities is robustly mean-square stable and satisfies a prescribed mixed H and passivity disturbance attenuation level in the presence of actuator faults. More precisely, a dynamic output feedback fault-tolerant controller is established in terms of linear matrix inequalities. Finally, numerical examples are provided to illustrate the usefulness and effectiveness of the proposed design technique.