Integrated fault estimation and fault-tolerant control design for large-scale interconnected systems

Abstract

An integrated fault estimation and fault-tolerant control (FTC) design is proposed in this paper for interconnected linear systems with uncertain nonlinear interactions subject to unknown bounded sensor faults. A decentralized FTC strategy, using the state/fault estimates obtained simultaneously by a decentralized unknown input observer, is employed to maintain the robust stability of the overall interconnected system and compensate the sensor fault effects. The observer and controller gains are solved together using a single-step linear matrix inequality (LMI) formulation. The performance effectiveness of the presented design is illustrated through an example of a 3-machine power system.