A Multilevel, Control-Theoretic Framework for Integration of Planning, Scheduling, and Rescheduling

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• 作者：S. A. Munawar and R. D. Gudi
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2005
• 出版时间：May 25, 2005
• 年：2005
• 卷：44
• 期：11
• 页码：4001 - 4021
• 全文大小：347K
• 年卷期：v.44,no.11(May 25, 2005)
• ISSN：1520-5045

文摘

In this paper, an integrated multilevel, control-theoretic framework has been proposed foreffectively handling integration of planning, scheduling, and rescheduling. A general resource-constrained, multistage, multiproduct plant operating as a hybrid flowshop facility has beenconsidered. The proposed approach is based on the inherent hierarchical decomposition of theoverall decision-making process that is a typical characteristic of large enterprises. The overallproblem is segregated into three levels with different horizons, wherein planning overmultiperiods is at the top level followed by scheduling for a single period at the middle leveland a detailed inventory management schedule for the operator at the lower level. In thehierarchical decomposition, the upper levels are equipped with abstractions of the lower levelsand proactiveness for reactive scheduling. The integration of reactive scheduling is motivatedby some of the process control principles like cascade control and the concepts of receding horizon.Using the philosophy of decentralized decision-making, it is demonstrated that the lower levelswith accurate models have the flexibility and amenability for rescheduling without upsettingthe global performance. As an illustrative case study, cyclic scheduling of a simple refinery flowsheet involving continuous lube production in a resource constrained hybrid flowshop is presentedto demonstrate the proposed methodology.