Design of a computationally efficient observer-based distributed fault detection and isolation scheme in second-order networked control systems. (September 2022)

• Record Type: Journal Article
• Authors: Khan, Aadil Sarwar; Khan, Abdul Qayyum; Iqbal, Naeem; Mustafa, Ghulam; Abbasi, Muhammad Asim; Mahmood, Atif
• Is Part Of: ISA transactions. Volume 128(2022)Part A
• Page Start: 229
• Page End: 241
• Publication Date: 2022-09
• Subjects: Fault detection -- Fault diagnosis -- Fault isolation -- Unknown input observer -- NCS -- Distributed FDI; Engineering instruments -- Periodicals; Engineering instruments; Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.isatra.2021.09.004
• Languages: English
• ISSNs: 0019-0578

Abstract

Abstract: This paper presents a novel directional observer-based fault detection and isolation scheme for second-order networked control systems (NCS). The directional unknown input observer (UIO) tool is exploited to study the problem of distributed fault detection and isolation (FDI). Two design schemes with global and partial/local network models are proposed to solve the distributed FDI problem. Thresholds are computed for the application of the proposed schemes in a noisy environment. In addition, the salient features of the proposed schemes are that both fault detection and fault isolation are achieved in a single step using a single observer. The schemes are applied to power system models to validate their results. A detailed comparison with existing FDI schemes is also provided, which clearly shows the effectiveness of the proposed scheme in terms of computational requirements. Highlights: The direction unknown input observer is used for distributed fault detection and isolation. Distributed FDI schemes with and without complete mathematical model of the system are presented. The developed schemes are more efficient in terms of computational burden.