UDE-based sliding mode control of DC–DC power converters with uncertainties

• Published in: Control engineering practice Vol. 83; pp. 116 - 128
• Main Authors: Tian, Zhen, Lyu, Zijun, Yuan, Jingqi, Wang, Cui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2019
• Subjects: Chattering reduction; DC–DC power converter; Mismatched uncertainty; Sliding mode control; Uncertainty and disturbance estimator; Uncertainty and disturbance estimator; Mismatched uncertainty; Sliding mode control; DC–DC power converter; Chattering reduction
• ISSN: 0967-0661; 1873-6939
• DOI: 10.1016/j.conengprac.2018.10.019

The DC–DC power converter plays an important role in solar systems to provide the stable DC bus voltage, but which is easily subject to various uncertainties and disturbances in practical operation. In this paper, an uncertainty and disturbance estimator (UDE) based sliding mode control approach is applied to improve the performance of power converters. The UDE is designed for the estimation of both the matched and mismatched uncertainties. To address the mismatched uncertainties, an adaptive sliding mode function is constructed with the compensation of the estimated uncertainties, which renders a chattering-free robust control law. Simulation and experimental results illustrate that the proposed control scheme achieves good dynamic performance, strong robustness and chattering reduction in the presence of uncertainties and disturbances •A novel sliding mode controller is applied to address mismatched uncertainties.•Uncertainty and disturbance estimator is designed without the knowledge of bounds.•The estimator-based robust controller is developed to eliminate the chattering phenomena.•Simulation and experimental validation on power converters are carried out.