Finite-time disturbance observer based non-singular terminal sliding-mode control for pulse width modulation based DC–DC buck converters with mismatched load disturbances

• Published in: IET power electronics Vol. 9; no. 9; pp. 1995 - 2002
• Main Authors: Wang, Junxiao, Li, Shihua, Yang, Jun, Wu, Bin, Li, Qi
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 27.07.2016
• Subjects: Buck converters; Channels; DC‐DC power convertors; disturbance estimation technique; Disturbance observers; disturbance rejection ability; Disturbances; finite‐time disturbance observer based nonsingular terminal sliding mode control; finite‐time stability analysis; FTDO based nonsingular terminal sliding mode control approach; FTDO‐based NTSMC method; Load resistance; matching condition; observers; power system faults; power system stability; Pulse duration modulation; pulse width modulation based DC‐DC buck converter; PWM power convertors; resistance load mismatchng disturbance; Sliding mode control; Terminals; variable structure systems; disturbance rejection ability; power system stability; disturbance estimation technique; PWM power convertors; FTDO based nonsingular terminal sliding mode control approach; FTDO-based NTSMC method; DC-DC power convertors; matching condition; power system faults; resistance load mismatchng disturbance; finite-time disturbance observer based nonsingular terminal sliding mode control; finite-time stability analysis; pulse width modulation based DC-DC buck converter; observers; variable structure systems
• ISSN: 1755-4535; 1755-4543
• DOI: 10.1049/iet-pel.2015.0178

This study investigates a finite-time disturbance observer (FTDO) based non-singular terminal sliding-mode control (NTSMC) approach for pulse width modulation based DC–DC buck converters subject to matched/mismatched resistance load disturbances. Considering the mismatched resistance load disturbance which does not act in the same channel as the control input, a novel non-singular terminal sliding-mode manifold incorporating with a disturbance estimation technique is designed. A FTDO-based NTSMC method is introduced for DC–DC buck converter systems. A rigorous finite-time stability analysis is also presented. As compared with the nominal NTSMC and existed SMC+ extended stated observer (ESO) method, the proposed method obtains a better disturbance rejection ability no matter the disturbances satisfy the so-called matching condition or not. Simulation and experimental comparison results are implemented to verify the effectiveness of the proposed control method.