Disturbance Observer-Based Feedback Linearization Control for a Quadruple-Tank Liquid Level System

A novel input/output feedback linearization control method by utilizing nonlinear disturbance observer (NDOB) is proposed for a quadruple-tank liquid level (QTLL) system in this paper. Firstly, the mathematical model of QTLL system is established by using Bernoulli’s law and mass conservation. Secon...

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Bibliographic Details
Published in:ISA transactions 2022-03, Vol.122, p.146-162
Main Authors: Meng, Xiangxiang, Yu, Haisheng, Zhang, Jie, Xu, Tao, Wu, Herong, Yan, Kejia
Format: Article
Language:English
Subjects:
Compensation control
Feedback linearization
Liquid level system
NDOB
Quadruple-tank
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Summary:A novel input/output feedback linearization control method by utilizing nonlinear disturbance observer (NDOB) is proposed for a quadruple-tank liquid level (QTLL) system in this paper. Firstly, the mathematical model of QTLL system is established by using Bernoulli’s law and mass conservation. Secondly, in view of the nonlinear and coupling characteristics of the QTLL system, a input/output feedback linearization controller is designed. Then, a NDOB is proposed to estimate disturbances and applied to compensation control. Finally, simulation and experimental results show that the proposed strategy has better control performances than PID control and the disturbance observer-based sliding mode control (DOBSMC). •A feedback linearization technique is used to design the controller for a QTLL system.•A nonlinear disturbance observer is proposed to estimate disturbances and applied to compensation control.•Simulation and experimental results show that the proposed strategy has good dynamic performance, steady-state performance and strong robustness compare with PID control and DOBSMC.
ISSN:0019-0578
1879-2022
DOI:10.1016/j.isatra.2021.04.021