Title: Novel disturbance estimation for robust discrete sliding mode control of DC/DC buck converter with approximate reduced order model

Authors: Surajkumar Sawai; Shailaja Kurode

Addresses: Department of Electrical Engineering, College of Engineering, Pune, 411015, India ' Department of Electrical Engineering, College of Engineering, Pune, 411015, India

Abstract: In this paper, a novel method of disturbance estimation is proposed for a discrete time system. It is shown that the method proposed yields a more accurate disturbance estimation at the current sampling instant. Compensation of the disturbance then provides robust performance of the system. The proposed method is validated by considering the control of DC to DC buck converter. Robust control for DC/DC buck converter is sought. A reduce-order model for the DC/DC buck converter is proposed for ease of control design. Discrete-time sliding mode controller with estimated disturbance is investigated for robust performance. It is shown that the proposed method yield desired performance irrespective of change in load, input voltage and parametric variation of the buck converter. The advantage of the proposed observer is that it does not require sampling the state at two different rates. The stability of the controller and the existence of sliding are proven. The effectiveness of the proposed method is validated through simulation and experimental results.

Keywords: discrete disturbance observer; discrete-time sliding mode control; DSMC; buck converter; robust control.

DOI: 10.1504/IJAMECHS.2023.132520

International Journal of Advanced Mechatronic Systems, 2023 Vol.10 No.3, pp.113 - 123

Received: 20 Aug 2022
Accepted: 26 Nov 2022
Published online: 25 Jul 2023 *

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