Fault-Tolerant Control for Discrete Linear Systems with Consideration of Actuator Saturation and Performance Degradation ★ ★This work was partially supported by National Natural Science Foundation of China (Grant No. 61273162) and the Fundamental Research Funds for the Central Universities (Grant No. HIT.NSRIF.2015034).

Abstract

This paper proposes an active fault-tolerant control method for discrete-time linear systems with actuator faults. The main contribution of this paper lies in the capability of dealing with the actuator saturation and accepting the performance degradation. In this paper, a fault estimation observer is first designed by constructing an equivalent descriptor system model of the original plant. To accept performance degradation of the post-fault system, a degradation factor is introduced into the REFERENCE model. In the fault-tolerant control design, both the actuator saturation and performance degradation are considered, and the fault-tolerant control input and the degradation factor are simultaneously designed by solving a constrained optimization problem. Finally, an aircraft example is simulated to demonstrate the effectiveness and performance of the proposed method.