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Related Experiment Videos

A new modified Smith predictor: the concept, design and tuning.

D Vrecko1, D Vrancić, D Juricić

  • 1Jozef Stefan Institute, Jamova, Ljubljana, Slovenia. darko.vrecko@ijs.si

ISA Transactions
|May 23, 2001
PubMed
Summary

A new modified Smith predictor (MSP) offers improved control for systems with long time delays. This advanced controller balances disturbance rejection and parameter robustness using a single tuning parameter.

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Area of Science:

  • Control Systems Engineering
  • Process Control
  • Automation

Background:

  • Industrial processes often exhibit long time delays, posing significant challenges for effective control.
  • Existing control strategies like the double controller-scheme (DCS) and predictive PI controllers have limitations in balancing performance and robustness.

Purpose of the Study:

  • To introduce a novel modified Smith predictor (MSP) designed for enhanced performance in processes with long time delays.
  • To present a tuning methodology for the MSP that optimizes its performance characteristics.
  • To evaluate the efficacy of the MSP against established controllers for time-delay systems.

Main Methods:

  • The modified Smith predictor (MSP) is developed as an extension of the double controller-scheme (DCS).

Related Experiment Videos

  • A tuning approach combining the magnitude optimum criterion with process parameterization using multiple integrals of the open-loop step response is employed.
  • Performance evaluation is conducted through simulation studies, comparing the MSP with DCS and Hägglund's predictive PI controller.

    • Main Results:

    • The MSP demonstrates superior performance compared to both the DCS and Hägglund's predictive PI controller in simulation studies.
    • The MSP allows for adjustable trade-offs between disturbance rejection and robustness to process parameter variations via a single parameter.
    • The proposed tuning method effectively optimizes the MSP's performance for time-delay systems.

    Conclusions:

    • The modified Smith predictor (MSP) presents a significant advancement for controlling processes with long time delays.
    • The MSP offers a flexible and effective solution for balancing disturbance rejection and robustness.
    • The developed tuning strategy enhances the practical applicability of the MSP in industrial settings.