Finite-time extended state observer enhanced nonsingular terminal sliding mode control for buck converters in the presence of disturbances: design, analysis and experiments

A sliding mode control (SMC) method is designed to attenuate the disturbances in the DC–DC buck converter system based on the estimated values of extended state observer (ESO). A conventional ESO is unable to accurately estimate system states and disturbances in finite time limited by its linear nat...

Full description

Saved in:
Bibliographic Details
Published inNonlinear dynamics Vol. 112; no. 9; pp. 7113 - 7127
Main Authors Lu, Hao, Li, Juan, Li, Shengquan, Wang, Shuwang, Xiao, Yi
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.05.2024
Springer Nature B.V
Subjects
Automotive Engineering
Buck converters
Classical Mechanics
Closed loops
Control
Control algorithms
Controllers
Design
Dynamical Systems
Electric vehicles
Engineering
Estimates
Feedback control
Fuel cells
Load
Mathematical models
Mechanical Engineering
Original Paper
Sliding mode control
Stability
State observers
Theorems
Upper bounds
Vibration
Finite-time control
Extended state observer
Disturbance rejection
Nonsingular terminal sliding mode control
DC–DC buck converter
Online AccessGet full text

Cover

More Information
Summary:A sliding mode control (SMC) method is designed to attenuate the disturbances in the DC–DC buck converter system based on the estimated values of extended state observer (ESO). A conventional ESO is unable to accurately estimate system states and disturbances in finite time limited by its linear nature. This weakness cannot ensure that the system reaches the nominal sliding mode surface within finite time, thus the sliding mode trajectory will be affected. Therefore, a novel finite-time extended state observer (FTESO) is presented, utilizing a homogeneous theorem for finite-time convergence. Subsequently, a FTESO-based nonsingular terminal sliding mode control (NTSMC) method is devised for achieving globally finite-time stable of the closed-loop system. The Lyapunov stability theorem and homogeneous theorem are used to prove the finite-time stability, and the upper bound of settling time is estimated explicitly. Finally, both numerical simulations and experiments demonstrate the superiority of the designed control scheme with modeling errors and load disturbances.
ISSN:0924-090X
1573-269X
DOI:10.1007/s11071-024-09381-6