Integrated Fault-Detection and Fault-Tolerant Control of Process Systems

Authors:	Christofides Panagiotis, University of California, Los Angeles, United States Mhaskar Prashant, University of California, Los Angeles, United States Gani Adiwinata, University of California, Los Angeles, United States El-Farra Nael H., University of California, Los Angeles, United States Davis James F., University of California, Los Angeles, United States
Topic:	6.1 Chemical Process Control
Session:	Modelling, Estimation and Fault Detection for Process Control
Keywords:	Fault-tolerant control, fault-detection, input constraints, stability region, Lyapunov-based control.

Abstract

This work proposes an approach to fault-tolerant control ofnonlinear processes with input constraints subject to controlsystem/actuator failures and is predicated upon the idea of integratingfault-detection, feedback and supervisory control. Specifically, anonlinear observer is first designed to generate estimates ofthe states. The estimates are used to implement Lyapunov-based state feedbackcontrollers and a fault-detection filter that computes the expected closed-loopbehavior in the absence of faults, and detects the occurrence offaults by comparing the expected behavior of the process variableswith the estimates. A switching policy is derived toorchestrate control system reconfiguration to achieve fault-tolerant control in the event that afailure is detected. Finally, simulation studies are presented todemonstrate the implementation of the proposed approach.