Distributed Joint Fault Estimation for Multi-Agent Systems via Dynamic Event-Triggered Communication

• Published in: IEEE control systems letters Vol. 8; pp. 868 - 873
• Main Authors: Wang, Zeyuan, Chadli, Mohammed
• Format: Journal Article
• Language: English
• Published: IEEE 01.01.2024
• Subjects: Actuators; Additives; Automatic; Distributed control; Engineering Sciences; Estimation; fault diagnosis; networked control systems; Observers; Protocols; Symmetric matrices; Topology; Fault diagnosis; Actuators; Protocols; Symmetric matrices; Additives; Networked control systems; Estimation; Observers; Distributed control; Topology
• ISSN: 2475-1456; 2475-1456
• DOI: 10.1109/LCSYS.2024.3405390

This letter studies a novel distributed fault estimation framework for multi-agent systems under directed topology, subject to time-varying multiplicative and additive faults. Both actuator and sensor faults are simultaneously addressed by introducing an augmented system. A two-step design process is presented aimed at joint estimation of faults, system state, and exogenous disturbance, which involves an <inline-formula> <tex-math notation="LaTeX">\ell </tex-math></inline-formula>th-order proportional-integral observer and a constrained least square estimator. Utilizing the relative output of neighbor information enhances the accuracy of fault and state estimation. Output sharing is realized by a dynamic event-triggered communication protocol, which effectively saves network resources. The design conditions of the observer are formulated as an optimization problem subject to linear matrix inequalities, ensuring guaranteed H-infinity performance of not only estimation error but also event error. Simulation results validate the effectiveness and feasibility of the proposed method.