Toward plant-wide control of reticulated systems arising in alumina refineries with online stabilisation

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Conference Proceeding
IFAC Proceedings Volumes (IFAC-PapersOnline), 2011, 44 (1 PART 1), pp. 10529 - 10534
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This paper presents a novel distributed model predictive control strategy for reticulated systems of the alumina refining process. The plant-wide control is facilitated by the constructive method of online stabilisations that is applicable to the model predictive controllers (MPC) as stability constraints. The plant-wide process is modeled as a large-scale system formed by the subsystems of different unit operations interconnected to each other. The stability condition for the interconnected system is derived from the accumulative quadratic constraint (AQC), which is subsequently developed into receding-horizon stability constraints for MPC. The proposed online stabilisation scheme can be implemented for a department and/or the whole alumina refinery, which consists of four main departments of digestion, clarification, precipitation-filtration, and evaporation. The theoretical results are illustrated by simulations for a typical example of three dynamically-coupled subsystems. © 2011 IFAC.
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