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<p>A nonlinear cascade sliding mode control (NLCSMC) method based on reduced-order extended state observer (RESO) is proposed for a DC–DC buck converter in the presence of total disturbances and chattering in this paper. First, all matched and mismatched disturbances in the DC–DC buck converter are modeled as a unified matched disturbance, which includes variations in load and input voltage. Next, a reduced-order extended state observer is developed to estimate system state variables and disturbances that cannot be directly measured. A nonlinear cascade sliding mode controller with a hyperbolic tangent function is introduced to enhance convergence, improve disturbance rejection, and minimize chattering. In addition, the detailed convergence analysis of the closed-loop system is provided by using Lyapunov stability theory. Finally, both simulation and experimental results demonstrate that the proposed nonlinear cascade sliding mode controller based on reduced-order extended state observer (NLCSMC-RESO) outperforms traditional sliding mode control methods using the same observer.</p>

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Chattering-free cascade sliding mode controller based on reduced-order extended state observer for a DC–DC buck converter with disturbances: design and experimentation

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Suyang Lu,
  • Juan Li,
  • Ziyuan Yang,
  • Shengquan Li,
  • Donglei Chen

摘要

A nonlinear cascade sliding mode control (NLCSMC) method based on reduced-order extended state observer (RESO) is proposed for a DC–DC buck converter in the presence of total disturbances and chattering in this paper. First, all matched and mismatched disturbances in the DC–DC buck converter are modeled as a unified matched disturbance, which includes variations in load and input voltage. Next, a reduced-order extended state observer is developed to estimate system state variables and disturbances that cannot be directly measured. A nonlinear cascade sliding mode controller with a hyperbolic tangent function is introduced to enhance convergence, improve disturbance rejection, and minimize chattering. In addition, the detailed convergence analysis of the closed-loop system is provided by using Lyapunov stability theory. Finally, both simulation and experimental results demonstrate that the proposed nonlinear cascade sliding mode controller based on reduced-order extended state observer (NLCSMC-RESO) outperforms traditional sliding mode control methods using the same observer.