Saturated output-feedback control and state estimation of a class of exothermic tubular reactors. (April 2022)

• Record Type: Journal Article
• Authors: Franco-de los Reyes, Hugo A.; Alvarez, Jesus
• Is Part Of: Journal of process control. Volume 112(2022)
• Page Start: 78
• Page End: 95
• Publication Date: 2022-04
• Subjects: Chemical tubular reactor control -- Nonlinear dynamics -- Saturated output-feedback control -- Distributed system -- Nonlinear observer -- Passive control -- Constructive control; Process control -- Periodicals; Fabrication -- Contrôle -- Périodiques; Process control; Periodicals; Electronic journals; 660.281
• DOI: 10.1016/j.jprocont.2022.02.005
• Languages: English
• ISSNs: 0959-1524

Abstract

Abstract: The problem of robustly stabilizing and estimating the state of an open-loop unstable continuous exothermic tubular reactor with constrained control is solved with a comprehensive methodology that includes: (i) a control–estimation (CE) system made by a saturated proportional–integral temperature control with anti-windup protector, and a low-order noninterfering (computationally efficient) nonlinear (NL) geometric state estimator, and (ii) closed-loop robust functioning conditions coupled with sensor location, control limits and gain selection criteria. The CE system is obtained as a simplified-robustified realization of the implementation with a robust NL estimator of a constrained NL state-feedback passive or model-predictive robust stabilizing control. The design methodology is illustrated and tested with a representative example through numerical simulation. Highlights: Control–estimation (CE) system design for exothermic tubular reactors. Robust stability conditions with sensor location, control limit and gain selection criteria. Solvability in terms of passivity, detectability, and bifurcation. CE system: PI control with antiwindup protection plus noninterfering state estimator. Estimator built with efficient PDE-to-ODE discretization.