Reconfiguration of Discretely Controlled Hybrid Systems for Changing Specifications

Tran, Thanh Ha; Stursberg, Olaf; Engell, Sebastian

doi:10.3182/20070613-3-fr-4909.00022

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Among these different alternatives, control system reconfiguration can constitute a useful tool to enable the transition between different regions of the operating space, involving the modification of the internal structure, and/or tuning parameters of the controller in order to meet the required performance indexes of the process operation . In this case, the main pursued objectives should be meeting the product specifications (product quality) along an optimum trajectory, while keeping the stability and safety of the process operation . A reconfiguration scheme has been proposed recently for a gas phase PE reactor in order to detect faulty actuators and guarantee the safe operation of the polymerization process .…”

Section: Introductionmentioning

confidence: 99%

“…[15] In this case, the main pursued objectives should be meeting the product specifications (product quality) along an optimum trajectory, while keeping the stability and safety of the process operation. [16] A reconfiguration scheme has been proposed recently for a gas phase PE reactor in order to detect faulty actuators and guarantee the safe operation of the polymerization process. [17] A model migration method has also been proposed to perform the on-line adaptation of a soft-sensor model used to control a polyvinyl chloride (PVC) polymerization process.…”

Section: Introductionmentioning

confidence: 99%

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Control of Bulk Propylene Polymerizations Operated with Multiple Catalysts through Controller Reconfiguration

Dutra

Feital

Skogestad

et al. 2013

Macromol. React. Eng.

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This paper presents a model to describe the dynamic behavior of bulk propylene polymerizations performed in a continuous reactor, assuming that three catalysts can be used. The model takes into account mass, energy, and statistical moment balances used to estimate the final polymer properties, including the melt index (MI) and extractables in xylene (XS). As the catalysts present different sensitivities to hydrogen, the proposed controller scheme considers that the MI control loop must be reconfigured in line and in real time when the catalysts are exchanged. Simulation results indicate that the reactor stability is maintained during specified production programs and that the desired final properties can be achieved satisfactorily. It is shown that control reconfiguration represents an alternative to overcome existing operation limits and recover operability when multiple catalysts are used at plant site.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%