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Parameter Selection in the Parameter Estimation of Grade Transitions in a Polyethylene Plant

Andersson, Niklas LU orcid ; Larsson, Per-Ola LU ; Åkesson, Johan ; Carlsson, Niclas ; Skålén, Staffan and Nilsson, Bernt LU orcid (2015) In Studies in Engineering and Technology 3(1). p.1-18
Abstract
A polyethylene plant at Borealis AB is modelled in the Modelica language and considered for parameter estimations at grade transitions. Parameters have been estimated for both the steady-state and the dynamic case using the JModelica.org platform, which offers tools for steady-state parameter estimation and supports simulation with parameter sensitivies. The model contains 31 candidate parameters, giving a huge amount of possible parameter combinations. The best parameter sets have been chosen using a parameter-selection algorithm that identified parameter sets with poor numerical properties. The parameter-selection algorithm reduces the number of parameter sets that is necessary to explore. The steady-state differs from the dynamic case... (More)
A polyethylene plant at Borealis AB is modelled in the Modelica language and considered for parameter estimations at grade transitions. Parameters have been estimated for both the steady-state and the dynamic case using the JModelica.org platform, which offers tools for steady-state parameter estimation and supports simulation with parameter sensitivies. The model contains 31 candidate parameters, giving a huge amount of possible parameter combinations. The best parameter sets have been chosen using a parameter-selection algorithm that identified parameter sets with poor numerical properties. The parameter-selection algorithm reduces the number of parameter sets that is necessary to explore. The steady-state differs from the dynamic case with respect to parameter selection. Validations of the parameter estimations in the dynamic case show a significant reduction in an objective value used to evaluate the quality of the solution from that of the nominal reference, where the nominal parameter values are used. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Parameter estimation, Parameter Selection, Modelica, Grade Change, Polymerisation
in
Studies in Engineering and Technology
volume
3
issue
1
pages
18 pages
ISSN
2330-2038
DOI
10.11114/set.v3i1.887
language
English
LU publication?
yes
id
efb51512-4ba7-438c-ac0a-a9887936ca84
date added to LUP
2016-04-08 16:27:41
date last changed
2024-11-20 02:18:23
@article{efb51512-4ba7-438c-ac0a-a9887936ca84,
  abstract     = {{A polyethylene plant at Borealis AB is modelled in the Modelica language and considered for parameter estimations at grade transitions. Parameters have been estimated for both the steady-state and the dynamic case using the JModelica.org platform, which offers tools for steady-state parameter estimation and supports simulation with parameter sensitivies. The model contains 31 candidate parameters, giving a huge amount of possible parameter combinations. The best parameter sets have been chosen using a parameter-selection algorithm that identified parameter sets with poor numerical properties. The parameter-selection algorithm reduces the number of parameter sets that is necessary to explore. The steady-state differs from the dynamic case with respect to parameter selection. Validations of the parameter estimations in the dynamic case show a significant reduction in an objective value used to evaluate the quality of the solution from that of the nominal reference, where the nominal parameter values are used.}},
  author       = {{Andersson, Niklas and Larsson, Per-Ola and Åkesson, Johan and Carlsson, Niclas and Skålén, Staffan and Nilsson, Bernt}},
  issn         = {{2330-2038}},
  keywords     = {{Parameter estimation; Parameter Selection; Modelica; Grade Change; Polymerisation}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{1}},
  pages        = {{1--18}},
  series       = {{Studies in Engineering and Technology}},
  title        = {{Parameter Selection in the Parameter Estimation of Grade Transitions in a Polyethylene Plant}},
  url          = {{http://dx.doi.org/10.11114/set.v3i1.887}},
  doi          = {{10.11114/set.v3i1.887}},
  volume       = {{3}},
  year         = {{2015}},
}