Cited by 23Adaptive Control of Nonlinear SystemsAdvanced Control Systems DesignStability and Control of Uncertain Systems

Predictive Extended State Observer-Based Active Disturbance Rejection Control for Systems with Time Delay

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Nahri, Syeda Nadiah Fatima, Du, Shengzhi, van Wyk, Barend J.·2023·Machines

Abstract

The latest research on disturbance rejection mechanisms has shown active disturbance rejection control (ADRC) to be an effective controller for uncertainties and nonlinear dynamics embedded in systems to be controlled. The significance of the ADRC controller is its model-free nature, as it requires minimal knowledge of the system model. In addition, it can actively estimate and compensate for the impact of internal and external disturbances present, with the aid of its crucial subsystem called the extended state observer (ESO). However, ADRC controller design becomes more challenging owing to different system disturbances, such as output disturbances, measurement noise, and varying time-delays persistent in the system’s communication channels. Most disturbance rejection techniques aim to reduce internal perturbations and external disturbances (input and output disturbance). However, output disturbance rejection with measurement noise under time-delay control is still a challenging problem. This paper presents a novel predictive ESO-based ADRC controller for time-delay systems by employing predictive methods to compensate for the disturbances originating from time delay. The prediction mechanism of the novel (proposed) controller design is greatly attributed to the extended state predictor observer (ESPO) integrated with the delay-based ADRC inside the proposed controller method. Thus, the proposed controller can predict the unknown system dynamics generated during the delay and compensate for these dynamics via disturbance rejection under time-delay control. This approach uses the optimization mechanism to determine controller parameters, where the genetic algorithm (GA) is employed with the integral of time-weighted absolute error (ITAE) as the fitness function. The proposed controller is validated by controlling second-order systems with time delay. Type 0, Type 1, and Type 2 systems are considered as the controlled plants, with disturbances (unknown dynamics due to delay and external disturbance), along with measurement noise present. The proposed controller method is compared with state-of-the-art methods, such as the modified time-delay-based ADRC method and the ESPO-based controller method. The findings indicate that the method proposed in this paper outperforms its existing competitors by compensating for the dynamics during the time delay and shows robust behaviour, improved disturbance rejection, and a fair extent of resilience to noise.

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  1. Han, J. A class of extended state observers for uncertain systems. Control Decis. 1995, 10, 85-88.
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Authors
Nahri, S. N. F., Du, S., & van Wyk, B. J.
Affiliations
  • Tshwane University of Technology (ZA)
  • Department of Electrical Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria 0183, South Africa
Corresponding author
Du, Shengzhi
Venue
Machines
Publisher
MDPI AG
Published
2023-01-20
Volume
11
Issue
2
Pages
144
ISSN
2075-1702 (ISSN-L)
OpenAlex
W4317617598
Cited by
23
References
42
Citations by year
2026: 5 · 2025: 8 · 2024: 7 · 2023: 3
FWCI
2.47
Type
journal article
Language
en
Open access
Locations
  • Machines (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Research Foundation of South Africa (98398, 138783)
Topics
  • Physical Sciences › Engineering › Control and Systems Engineering › Adaptive Control of Nonlinear Systems
  • Physical Sciences › Engineering › Control and Systems Engineering › Advanced Control Systems Design
  • Physical Sciences › Engineering › Control and Systems Engineering › Stability and Control of Uncertain Systems
Keywords
active disturbance rejection control, extended state observer, time-delay systems, measurement noise, genetic algorithm tuning, second-order systems, robust control

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