Design of Disturbance Observer for Third- Order Interval Plants

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Year : 2024 | Volume : 14 | Issue : 03 | Page :
    By

    B. Amarendra Reddy,

  • Manapragada Umakameshwari,

  • Urimiti Prathyusha,

  • Ch Nayak Bhukya,

  • A. Venkatesh,

  1. Associate Professor,, Department of Electrical Engineering, Andhra University College of Engineering, Andhra Pradesh,, India.
  2. Student,, Department of Electrical Engineering, Andhra University College of Engineering, Andhra Pradesh,, India.
  3. Associate Professor,, Department of Electrical Engineering, Andhra University College of Engineering, Andhra Pradesh,, India
  4. Research Scholar, Department of Electrical Engineering, Andhra University College of Engineering,, Andhra Pradesh,, India
  5. Research Scholar, Department of Electrical Engineering, Andhra University College of Engineering,, Andhra Pradesh,, India

Abstract

This paper outlines the development of a disturbance observer (DOB) specifically tailored for third-order interval plants, which are distinguished by uncertainties in their parameters. Utilizing an interval-based modeling approach, this design effectively captures variations in system dynamics, providing robust control solutions for plants with parameter uncertainties. The key focus is creating a disturbance observer capable of real-time estimation and compensation for external disturbances and model uncertainties. The proposed DOB is engineered using a nominal model of the third-order plant, carefully considering the interval uncertainties. The paper includes simulation results that effectively illustrate the effectiveness of the disturbance observer in achieving disturbance rejection and robust control performance of third-order interval plants. The method notably enhances system stability and robustness, especially in significant model variations and external disturbances, making it a compelling choice for applications demanding precise control under uncertain conditions. Here, the third- order interval plants are chosen by considering the uncertainty associated with each parameter, and all possible plants are designed based on the Kharitonov polynomial approach. A disturbance observer is designed for a third–order interval plant and the disturbances are identified using a disturbance observer and such system is regulated using PID Controller. For a third-order plant the PID controller is designed which effectively regulates the uncertain plant, when this plant is subjected to the disturbances the plant is unregulated. The disturbance observer is designed for these plants to estimate the external disturbance, and this signal is added as feedback signal to counteract the external effects of the disturbances. Simulations are performed by considering third–order interval plants in the MATLAB environment and the uncertainties are taken in the respective parameters. Here, the reference and disturbance signals like step, sine, square, sawtooth, and stair generator signals are considered for simulation.

Keywords: Proportional-integral derivative control, Low Pass Filter, Disturbance observer (DOB), Third order interval plants, Kharitonov polynomial method

[This article belongs to Trends in Electrical Engineering ]

How to cite this article:
B. Amarendra Reddy, Manapragada Umakameshwari, Urimiti Prathyusha, Ch Nayak Bhukya, A. Venkatesh. Design of Disturbance Observer for Third- Order Interval Plants. Trends in Electrical Engineering. 2024; 14(03):-.
How to cite this URL:
B. Amarendra Reddy, Manapragada Umakameshwari, Urimiti Prathyusha, Ch Nayak Bhukya, A. Venkatesh. Design of Disturbance Observer for Third- Order Interval Plants. Trends in Electrical Engineering. 2024; 14(03):-. Available from: https://journals.stmjournals.com/tee/article=2024/view=187152


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Regular Issue Subscription Review Article
Volume 14
Issue 03
Received 11/11/2024
Accepted 28/11/2024
Published 04/12/2024
249

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