Robust fault detection and isolation technique for single-input/single-output closed-loop control systems that exhibit actuator and sensor faults

Abstract

Document VersionPublisher's PDF, also known as Version of record Link to publication from Aalborg University Citation for published version (APA):Izadi-Zamanabadi, R., Alavi, S. M. M., & Hayes, M. J. (2008). Robust fault detection and isolation technique for single-input/single-output closed-loop control systems that exhibit actuator and sensor faults. IET Control Theory and Applications, 2(11), 951-965. https://doi.org/10.1049/iet-cta:20070382 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.? Users may download and print one copy of any publication from the public portal for the purpose of private study or research. ? You may not further distribute the material or use it for any profit-making activity or commercial gain ? You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access to the work immediately and investigate your claim. Abstract: An integrated quantitative feedback design and frequency-based fault detection and isolation (FDI) approach is presented for single-input/single-output systems. A novel design methodology, based on shaping the system frequency response, is proposed to generate an appropriate residual signal that is sensitive to actuator and sensor faults in the presence of model uncertainty and exogenous unknown (unmeasured) disturbances. The key features of this technique are: (1) the uncertain phase information is fully addressed by the design equations, resulting in a minimally conservative over-design and (2) a graphical environment is provided for the design of fault detection (FD) filter, which is intuitively appealing from an engineering perspective. The FD filter can easily be obtained by manually shaping the frequency response into the complex plane. The question of interaction between actuator and sensor fault residuals is also considered. It is discussed how the actuator and sensor faults are distinguished from each other by appropriately defining FDI threshold values. The efficiency of the proposed method is demonstrated on a single machine infinite bus power system wherein a stabilised coordinate power system incorporating a robust FDI capability is achieved.

Fault estimation and tolerant control for discrete‐time nonlinear stochastic multiple‐delayed systems with intermittent sensor and actuator faults

“…With the ongoing development of the industrial technology, 1‐4 engineering systems, the safety‐critical systems, are required to operate more and more accurately, because any fault especially intermittent fault (IF) in sensors, actuators, or processes may result in system breakdown, economic loss, system performance degradation, and even disastrous situations 5‐9 . Thus, fault diagnosis (FD) plays an increasingly important role 10,11 . It is worth pointing out that fault estimation (FE) method is one of the most common and essential FD methods 12 .…”