New continuous-time scheduling formulation for continuous plants under variable electricity cost / Pedro M. Castro in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009)  

New continuous-time scheduling formulation for continuous plants under variable electricity cost [texte imprimé] / Pedro M. Castro, Auteur ; Iiro Harjunkoski, Auteur ; Ignacio E. Grossmann, Auteur . - 2009 . - pp. 6701–6714.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6701–6714

Mots-clés :	Continuous plants Scheduling Time-dependent electricity pricing Discrete-time formulation Continuous-time
Résumé :	This work addresses the scheduling of continuous plants subject to energy constraints related to time-dependent electricity pricing and availability. Discrete- and continuous-time formulations are presented that can address these issues together with multiple intermediate due dates. Both formulations rely on the resource−task network process representation. Their computational performance is compared for the objective of total electricity minimization with the results favoring the discrete-time model due to the more natural way of handling such a wide variety of discrete events. In particular, it can successfully handle problems of industrial size. Nevertheless, the new continuous-time model is a major breakthrough since it is the first model of its type that is able to effectively incorporate time-variable utility profiles. When compared to a simple manual scheduling procedure, the proposed scheduling approaches can lead to potential electricity savings around 20% by switching production from periods of high to low electricity cost.
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie900073k