Auto-tuning cascade loops subject to saturation

Auto-tuning of outer-loop (master) controllers for cascade feedback loops runs into considerable problems if the inner-loop (slave) controller is liable to saturate. We explain how these problems arise, and propose a modified auto-tuning procedure to overcome these problems. Two enhancements of the...

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Published inIFAC Proceedings Volumes Vol. 43; no. 10; pp. 191 - 195
Main Authors Butt, A.S., Maciejowski, J.M., McNaughton, H.M.
Format Journal Article
LanguageEnglish
Published 2010
Subjects
Autotuners
cascade control
learning control
saturation
saturation
learning control
Autotuners
cascade control
Online AccessGet full text
ISSN1474-6670
DOI10.3182/20100826-3-TR-4015.00037

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Abstract Auto-tuning of outer-loop (master) controllers for cascade feedback loops runs into considerable problems if the inner-loop (slave) controller is liable to saturate. We explain how these problems arise, and propose a modified auto-tuning procedure to overcome these problems. Two enhancements of the inner-loop controller are proposed, which prevent this controller from saturating, and a correspondingly modified method of analysing the resulting data and determining PID controller parameters is presented. The efficacy of these proposals is illustrated on a realistic example.
AbstractList Auto-tuning of outer-loop (master) controllers for cascade feedback loops runs into considerable problems if the inner-loop (slave) controller is liable to saturate. We explain how these problems arise, and propose a modified auto-tuning procedure to overcome these problems. Two enhancements of the inner-loop controller are proposed, which prevent this controller from saturating, and a correspondingly modified method of analysing the resulting data and determining PID controller parameters is presented. The efficacy of these proposals is illustrated on a realistic example.
Author Butt, A.S.
McNaughton, H.M.
Maciejowski, J.M.
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Keywords saturation
learning control
Autotuners
cascade control
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References Åström, Hägglund (bib3) 1995
Åström, Hägglund (bib1) 1984; 20
Ziegler, Nichols (bib5) 1942; 64
Atherton (bib4) 1975
Åström, Hägglund (bib2) 1988
Atherton (10.3182/20100826-3-TR-4015.00037_bib4) 1975
Ziegler (10.3182/20100826-3-TR-4015.00037_bib5) 1942; 64
Åström (10.3182/20100826-3-TR-4015.00037_bib3) 1995
Åström (10.3182/20100826-3-TR-4015.00037_bib2) 1988
Åström (10.3182/20100826-3-TR-4015.00037_bib1) 1984; 20
References_xml – volume: 64
  start-page: 759
  year: 1942
  end-page: 768
  ident: bib5
  article-title: Optimum settings for automatic controllers
  publication-title: Trans. ASME
– year: 1995
  ident: bib3
  publication-title: PID Controllers: Theory, Design and Tuning
– year: 1975
  ident: bib4
  publication-title: Nonlinear Control Engineering – Describing Function Analysis and Design
– year: 1988
  ident: bib2
  publication-title: Automatic Tuning of PID Controllers
– volume: 20
  start-page: 645
  year: 1984
  end-page: 651
  ident: bib1
  article-title: Automatic tuning of simple regulators
  publication-title: Automatica
– volume: 20
  start-page: 645
  year: 1984
  ident: 10.3182/20100826-3-TR-4015.00037_bib1
  article-title: Automatic tuning of simple regulators
  publication-title: Automatica
  doi: 10.1016/0005-1098(84)90014-1
– year: 1995
  ident: 10.3182/20100826-3-TR-4015.00037_bib3
– year: 1988
  ident: 10.3182/20100826-3-TR-4015.00037_bib2
– volume: 64
  start-page: 759
  year: 1942
  ident: 10.3182/20100826-3-TR-4015.00037_bib5
  article-title: Optimum settings for automatic controllers
  publication-title: Trans. ASME
– year: 1975
  ident: 10.3182/20100826-3-TR-4015.00037_bib4
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Snippet Auto-tuning of outer-loop (master) controllers for cascade feedback loops runs into considerable problems if the inner-loop (slave) controller is liable to...
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SubjectTerms Autotuners
cascade control
learning control
saturation
Title Auto-tuning cascade loops subject to saturation
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Volume 43
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