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Actuator stiction compensation via variable amplitude pulses.

B M S Arifin1, C J Munaro2, O F B Angarita2

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, T6G 2V4, Canada.

ISA Transactions
|January 17, 2018
PubMed
Summary

A new stiction compensation method uses varying pulses to eliminate valve oscillations and improve control. This model-free approach adapts to friction uncertainties, enhancing setpoint tracking and disturbance rejection in industrial systems.

Keywords:
Control valvesFriction compensationProcess controlValve positionerValve stiction

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Area of Science:

  • Control Engineering
  • Process Automation
  • Friction Modeling

Background:

  • Stiction, a common nonlinearity in industrial control valves, causes oscillations and degrades performance.
  • Existing methods often require accurate friction models or introduce significant valve movement.
  • Effective stiction compensation is crucial for maintaining process stability and efficiency.

Purpose of the Study:

  • To develop a novel model-free stiction compensation scheme.
  • To eliminate oscillations and reduce valve movement in control systems.
  • To achieve robust setpoint tracking and disturbance rejection despite valve stiction.

Main Methods:

  • Implementation of a model-free compensation algorithm using pulses of varying amplitude.
  • Controller output is augmented with pulses to overcome stiction.
  • Adaptive compensation strategy: standby mode when error is small, re-activation upon exceeding a threshold.

Main Results:

  • Successfully eliminated oscillations caused by valve stiction.
  • Significantly reduced unnecessary valve movement.
  • Demonstrated good setpoint tracking and disturbance rejection capabilities.
  • Algorithm effectively copes with uncertainties in friction characteristics.

Conclusions:

  • The proposed model-free stiction compensation scheme offers an effective solution for improving control performance.
  • The adaptive pulse-based strategy provides robustness against friction variations.
  • Validated through simulation and industrial Distributed Control System (DCS) implementation.