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<p>The four-switch buck-boost (FSBB) converter is widely employed in integrated photovoltaic, energy storage, and charging DC microgrids. However, the highly dynamic voltage and load conditions in DC microgrids hinder the efficient and stable operation of FSBB converters. To address the limitations in terms of dynamic regulation speed and disturbance rejection under wide voltage fluctuations and large load variations, this paper proposes a cascaded control strategy based on linear active disturbance rejection control (LADRC) to enhance transient performance and robustness. A dual-mode small-signal model of the FSBB converter is established to analyze the mechanism behind the dynamic performance of conventional PI control in the presence of bandwidth limitations and parameter coupling. Building on this, a cascaded LADRC architecture is designed, which employs a linear extended state observer (LESO) for the real-time estimation of system disturbances. This approach utilizes linear state error feedback to achieve current-voltage dual-loop dynamic decoupling, resulting in a single-parameter dual-mode control strategy. Experimental results demonstrate that the proposed method effectively suppresses coupling effects and significantly enhances the dynamic performance and robustness of FSBB under voltage fluctuations and load variations.</p>

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LADRC-based fast transient response control strategy for FSBB converters

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Anfei Xu,
  • Lifu Guo,
  • Lei Yuan

摘要

The four-switch buck-boost (FSBB) converter is widely employed in integrated photovoltaic, energy storage, and charging DC microgrids. However, the highly dynamic voltage and load conditions in DC microgrids hinder the efficient and stable operation of FSBB converters. To address the limitations in terms of dynamic regulation speed and disturbance rejection under wide voltage fluctuations and large load variations, this paper proposes a cascaded control strategy based on linear active disturbance rejection control (LADRC) to enhance transient performance and robustness. A dual-mode small-signal model of the FSBB converter is established to analyze the mechanism behind the dynamic performance of conventional PI control in the presence of bandwidth limitations and parameter coupling. Building on this, a cascaded LADRC architecture is designed, which employs a linear extended state observer (LESO) for the real-time estimation of system disturbances. This approach utilizes linear state error feedback to achieve current-voltage dual-loop dynamic decoupling, resulting in a single-parameter dual-mode control strategy. Experimental results demonstrate that the proposed method effectively suppresses coupling effects and significantly enhances the dynamic performance and robustness of FSBB under voltage fluctuations and load variations.