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Experimental sensorless control for a coupled two-tank system using high gain adaptive observer and nonlinear

Houssemeddine Gouta1, Salim Hadj Saïd2, Amani Turki2

  • 1Research Unit of Industrial Systems Study and Renewable Energy (ESIER), National Engineering School of Monastir (ENIM), Ibn El Jazzar, 5019, Monastir, University of Monastir, Tunisia; High Institute of Technological Studies of Nabeul (ISET Nabeul), Mrezgua, 8000 Nabeul, Tunisia.

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Summary

This study introduces an adaptive control for coupled two-tank systems using a generalized predictive controller and an adaptive observer. The method enables sensorless control by estimating upper tank levels and system parameters, validated by simulations and experiments.

Keywords:
Experimental validationGeneralized predictive controlHigh gain adaptive observerLiquid level controlNonlinear parameterization

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Area of Science:

  • Control Engineering
  • Chemical Engineering
  • System Dynamics

Background:

  • Coupled two-tank systems are common in industrial processes.
  • Accurate liquid level estimation and parameter identification are crucial for effective control.
  • Sensorless control strategies reduce hardware complexity and cost.

Purpose of the Study:

  • To propose an adaptive control strategy for a coupled two-tank system.
  • To develop a sensorless control approach using only bottom tank liquid level measurements.
  • To estimate upper tank liquid level and system parameters adaptively.

Main Methods:

  • Utilized a generalized predictive controller (GPC) minimizing a cost function over a prediction horizon.
  • Developed an adaptive interconnected high-gain observer for state and parameter estimation.
  • Implemented sensorless control based on bottom tank liquid level measurement.

Main Results:

  • Successfully estimated upper tank liquid level and two constant system parameters.
  • Achieved control calibration via tuning of only two scalar design parameters.
  • Established exponential convergence of state observation and parameter estimation errors.

Conclusions:

  • The proposed observer-controller scheme demonstrates efficiency and applicability.
  • Validated theoretical results through simulation and experimental data.
  • Offers a robust solution for sensorless adaptive control of coupled two-tank systems.