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Flexible-structure control: a strategy for releasing input constraints.

Leonardo L Giovanini1

  • 1Industrial Control Centre, University of Strathclyde, Graham Hills Building, 50 George Street, Glasgow G1 1QE, United Kingdom. leonardo.giovanini@eee.strath.ac.uk

ISA Transactions
|July 27, 2004
PubMed
Summary

Output unreachability under input saturation is a challenge in process control. This paper introduces flexible-structure control, a novel approach that adapts control strategies to maintain setpoint tracking.

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Area of Science:

  • Process Control
  • Automation Engineering

Background:

  • Input saturation can lead to output unreachability, preventing processes from reaching setpoints even with maximum manipulated variable effort.
  • Auxiliary manipulated variables are often required to recover setpoint tracking.

Purpose of the Study:

  • To address the output unreachability phenomenon under input saturation.
  • To propose a new control structure capable of managing this challenge.

Main Methods:

  • Introduced a novel control structure termed flexible-structure control.
  • This structure generalizes split-range control, employing two controllers linked by a piecewise linear function.
  • The function dynamically adjusts control strategy based on manipulated variable values and system dynamics.

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Main Results:

  • The proposed flexible-structure control effectively manages output unreachability caused by input saturation.
  • The control structure allows for adaptive changes based on operating conditions.
  • Parameters enable operators to balance control quality with other operational objectives.

Conclusions:

  • Flexible-structure control offers a robust solution for processes exhibiting input saturation and output unreachability.
  • This adaptive approach enhances process stability and performance.
  • The control structure provides flexibility for operators to tune performance based on specific needs.