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<p>The CLLLC resonant converter, a kind of DC-DC converter, is widely utilized in microgrid energy storage and electric car charging. This paper offers a cascaded-observer-based sliding mode linear active disturbance rejection control (SM-LADRC) voltage regulation control approach to address output voltage swings and sluggish system responsiveness under complex disturbances. Initially, owing to the inadequate observation precision of the conventional linear extended state observer (LESO), a cascaded linear extended state observer (CLESO) is used to monitor residual disturbances. An investigation of disturbance rejection capabilities is undertaken by determining the total disturbance transfer function of the observer. Then, to mitigate the sluggish convergence inherent in traditional proportional-derivative (PD) control for linear state error feedback (LSEF), a fractional-order sliding mode control is developed to supplant the conventional PD control in formulating the LSEF. A stability assessment is performed on the suggested control scheme, and it shows that it improves the system reaction time and robustness. In conclusion, the superior dynamic response performance of the proposed cascaded observer-based SM-LADRC strategy is validated by experimental results obtained on a 1&#xa0;kW prototype.</p>

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Cascaded observer-based SM-LADRC for CLLLC resonant converters

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Zhiguo Hu,
  • Longfei Pan,
  • Hao Wang

摘要

The CLLLC resonant converter, a kind of DC-DC converter, is widely utilized in microgrid energy storage and electric car charging. This paper offers a cascaded-observer-based sliding mode linear active disturbance rejection control (SM-LADRC) voltage regulation control approach to address output voltage swings and sluggish system responsiveness under complex disturbances. Initially, owing to the inadequate observation precision of the conventional linear extended state observer (LESO), a cascaded linear extended state observer (CLESO) is used to monitor residual disturbances. An investigation of disturbance rejection capabilities is undertaken by determining the total disturbance transfer function of the observer. Then, to mitigate the sluggish convergence inherent in traditional proportional-derivative (PD) control for linear state error feedback (LSEF), a fractional-order sliding mode control is developed to supplant the conventional PD control in formulating the LSEF. A stability assessment is performed on the suggested control scheme, and it shows that it improves the system reaction time and robustness. In conclusion, the superior dynamic response performance of the proposed cascaded observer-based SM-LADRC strategy is validated by experimental results obtained on a 1 kW prototype.