Fixed structure H control of couple tank system and anti-integral windup PID control strategy for actuator saturation

Muhammad Zia Ur Rahman*, Inam Ul Hassan Shaikh, Ahsan Ali, Nasir Ahmad

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper considered two main issues. First is about the complete mathematical modelling and Fixed-Structure robust controller design for couple tank system in frequency domain. This system is nonlinear and classical Proportional Integral Derivative (PID) controller may not give appropriate performance. Although classical PID controllers are more practical due their simplicity and linearity but they have some limitations. Especially in case of nonlinear system or small variations in parameters, they may not give desired transient specification. The proposed controller is a robust controller which contains a fixed structure and fixed order, and its parameters are optimized using non smooth H optimization in frequency domain. Also Fixed-Structure H controller also gives satisfied performance in case of parameters variation. Couple tank system is widely used in industry. For example its most important applications are water purification, effluent treatment, dairy filtration, chemical processing and also this system is used in pharmaceutical industry. Actuator saturation is a major nonlinearity that may exist in couple tank systems. And this nonlinearity may lead to performance degradation or instability of controller and whole system. This problem is known as integral windup and to deal this problem, an Anti-Integral Windup PID control strategy is introduced in the second part of this paper.

Original languageEnglish
Title of host publicationWorld Congress on Industrial Control Systems Security (WCICSS-2016)
Subtitle of host publicationproceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages27-32
Number of pages6
ISBN (Electronic)9781908320636, 9781908320643
ISBN (Print)9781509025442
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event2016 World Congress on Industrial Control Systems Security, WCICSS 2016 - London, United Kingdom
Duration: 12 Dec 201614 Dec 2016

Other

Other2016 World Congress on Industrial Control Systems Security, WCICSS 2016
CountryUnited Kingdom
CityLondon
Period12/12/1614/12/16

Keywords

  • Couple tank system
  • Classical PID
  • Non smooth H∞ optimization
  • Fixed-Structure H∞ controller
  • Integral windup
  • Anti-integral windup

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