Combined Noncyclic Scheduling and Advanced Control for Continuous Chemical Processes

A novel formulation for combined scheduling and control of multi-product, continuous chemical processes is introduced in which nonlinear model predictive control (NMPC) and noncyclic continuous-time scheduling are efficiently combined. A decomposition into nonlinear programming (NLP) dynamic optimiz...

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Bibliographic Details
Published in:Processes 2017-12, Vol.5 (4), p.83
Main Authors: Petersen, Damon, Beal, Logan, Prestwich, Derek, Warnick, Sean, Hedengren, John
Format: Article
Language:English
Subjects:
Computer applications
Continuously stirred tank reactors
Economic conditions
Integer programming
Iterative methods
Linear programming
Markets
Nonlinear control
Nonlinear programming
Predictive control
Production scheduling
Scheduling
Variations
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Summary:A novel formulation for combined scheduling and control of multi-product, continuous chemical processes is introduced in which nonlinear model predictive control (NMPC) and noncyclic continuous-time scheduling are efficiently combined. A decomposition into nonlinear programming (NLP) dynamic optimization problems and mixed-integer linear programming (MILP) problems, without iterative alternation, allows for computationally light solution. An iterative method is introduced to determine the number of production slots for a noncyclic schedule during a prediction horizon. A filter method is introduced to reduce the number of MILP problems required. The formulation’s closed-loop performance with both process disturbances and updated market conditions is demonstrated through multiple scenarios on a benchmark continuously stirred tank reactor (CSTR) application with fluctuations in market demand and price for multiple products. Economic performance surpasses cyclic scheduling in all scenarios presented. Computational performance is sufficiently light to enable online operation in a dual-loop feedback structure.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr5040083