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<p>The linear extended state observer (LESO) has been widely applied to the voltage regulation of dual three-phase permanent magnet synchronous generators (DTP-PMSGs), owing to its low model dependency and straightforward parameter tuning. However, the conventional LESO exhibits drawbacks in terms of slow convergence and limited disturbance estimation accuracy, which degrade the disturbance rejection and tracking performance of the voltage control loop. To address these limitations, this paper proposes a voltage control method utilizing a variable-bandwidth cascaded extended state observer (VCESO). First, a cascaded observer structure is adopted to expand the observation range and enhance disturbance rejection capability. Then, an adaptive variable-bandwidth mechanism following the principle of "large error, high bandwidth; small error, low bandwidth" is integrated into the cascaded ESO (CESO). This design mitigates the inherent oscillations of disturbance estimation in CESO, while further improving both disturbance rejection and reference tracking performance of the voltage loop. Finally, the feasibility and effectiveness of the proposed VCESO are validated on a DTP-PMSG system through experimental results.</p>

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A variable-bandwidth cascaded extended state observer for voltage control in dual three-phase PMSG drives

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Pei Li,
  • Pan Li,
  • Guijie Yang,
  • Jianyong Su

摘要

The linear extended state observer (LESO) has been widely applied to the voltage regulation of dual three-phase permanent magnet synchronous generators (DTP-PMSGs), owing to its low model dependency and straightforward parameter tuning. However, the conventional LESO exhibits drawbacks in terms of slow convergence and limited disturbance estimation accuracy, which degrade the disturbance rejection and tracking performance of the voltage control loop. To address these limitations, this paper proposes a voltage control method utilizing a variable-bandwidth cascaded extended state observer (VCESO). First, a cascaded observer structure is adopted to expand the observation range and enhance disturbance rejection capability. Then, an adaptive variable-bandwidth mechanism following the principle of "large error, high bandwidth; small error, low bandwidth" is integrated into the cascaded ESO (CESO). This design mitigates the inherent oscillations of disturbance estimation in CESO, while further improving both disturbance rejection and reference tracking performance of the voltage loop. Finally, the feasibility and effectiveness of the proposed VCESO are validated on a DTP-PMSG system through experimental results.