LAPSE:2018.0290
Published Article
LAPSE:2018.0290
Combined Noncyclic Scheduling and Advanced Control for Continuous Chemical Processes
Damon Petersen, Logan D. R. Beal, Derek Prestwich, Sean Warnick, John D. Hedengren
July 31, 2018
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.
Keywords
dynamic market, Model Predictive Control, nonlinear, process disturbances, Scheduling
Suggested Citation
Petersen D, Beal LDR, Prestwich D, Warnick S, Hedengren JD. Combined Noncyclic Scheduling and Advanced Control for Continuous Chemical Processes. (2018). LAPSE:2018.0290
Author Affiliations
Petersen D: Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA
Beal LDR: Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA [ORCID]
Prestwich D: Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA
Warnick S: Department of Computer Science, Brigham Young University, Provo, UT 84602, USA
Hedengren JD: Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA [ORCID]
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Journal Name
Processes
Volume
5
Issue
4
Article Number
E83
Year
2017
Publication Date
2017-12-13
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr5040083, Publication Type: Journal Article
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LAPSE:2018.0290
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doi:10.3390/pr5040083
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Jul 31, 2018
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