Title: Non-singular terminal sliding mode control of converter-fed DC motor system with mismatched disturbance compensation

Authors: Arshad Rauf; Muhammad Zafran; Muhammad Sadiq Ali Khan; Awais Khan; Syed Awais Ali Shah

Addresses: Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, School of Automation, Southeast University, Nanjing 210096, Jiangsu, China; College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China ' Department of Electrical and Computer Engineering, COMSATS University Islamabad, Abbottabad Campus, 22060, Pakistan ' Department of Computer Science, University of Karachi, Pakistan ' College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China ' School of Electrical Engineering, Southeast University, Nanjing 210096, Jiangsu, China

Abstract: In this paper, the problem of angular velocity trajectory tracking for converter-fed DC motor system with disturbances/uncertainties is addressed. The combination power converters with DC motors for generating 'smooth start of drives' has numerous practical applications. Achieving high performance in such systems is however limited by the influence of multiple disturbances. Furthermore, the conventional mathematical model complicates the ability to compensate the multiple disturbances. In this paper, a control structure with non-singular terminal sliding mode controller and a finite-time disturbance observer is proposed. First, a special state transformation is applied, aggregating disturbances/uncertainties in a sole perturbing term of the system expressed in new coordinates. Then, the observer estimates the information about the lumped disturbances and the obtained estimated signals are used to construct a sliding surface. Finally, the sliding mode controller is applied to achieve desired result. The efficiency of the proposed control method is validated through numerical simulations.

Keywords: converter-fed DC motor; finite-time disturbance observer; mismatched disturbances; sliding surface.

DOI: 10.1504/IJMIC.2021.123793

International Journal of Modelling, Identification and Control, 2021 Vol.39 No.4, pp.285 - 292

Received: 19 Nov 2020
Accepted: 20 Feb 2021
Published online: 04 Jul 2022 *

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