Distributed-observer-based fault diagnosis and fault-tolerant control for time-varying discrete interconnected systems

In this paper, we study distributed-observer-based fault diagnosis and propose a fault-tolerant control approach for a class of discrete interconnected systems. The distributed fault observers are designed to estimate faults based on the improved fast adaptive fault estimation (FAFE) algorithm. As a result of the improved FAFE algorithm, the constraints which are necessary to the general FAFE algorithm can be reduced while the fault estimation accuracy can be maintained. Based on the online fault estimates, the distributed output feedback controllers are developed to accommodate faults. To solve the observers and controllers, the corresponding algorithms are proposed. Finally, various fault situations are considered in detail in a simulation, and the results verify the accuracy of the theory and method.