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Robust PI/PID controllers for load disturbance based on direct synthesis.

R Vilanova1, O Arrieta2, P Ponsa3

  • 1Departament de Telecomunicació i d'Enginyeria de Sistemes, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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|August 28, 2018
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Summary

This study presents a robust tuning method for PI/PID controllers using the direct synthesis for load disturbance (DS-d) approach. It provides tuning guidelines to balance disturbance rejection and robustness for improved process control.

Keywords:
PIPIDRegulationRobust

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Area of Science:

  • Process Control
  • Robust Control
  • Industrial Automation

Background:

  • Disturbance rejection is critical in process control, often prioritized over set-point tracking.
  • Existing direct synthesis for load disturbance (DS-d) methods offer tuning via a single parameter but lack guidance on selecting it for desired robustness.

Purpose of the Study:

  • To propose a robust tuning strategy for PI/PID controllers within the DS-d framework.
  • To provide a method for selecting the DS-d tuning parameter to achieve a desired level of robustness.

Main Methods:

  • The study extends the direct synthesis for load disturbance (DS-d) approach for PI/PID controller tuning.
  • It derives tuning expressions for common process models, optimizing the closed-loop time constant for robustness.

Main Results:

  • A systematic approach for selecting the DS-d tuning parameter is presented.
  • Tuning expressions are provided to achieve the fastest possible closed-loop response while maintaining desired robustness.

Conclusions:

  • The proposed method offers a practical guide for robust tuning of PI/PID controllers using DS-d.
  • Simulation examples demonstrate the effectiveness of the suggested tuning strategy in achieving robust disturbance rejection.