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<p>This paper investigates the fixed-time distributed secondary control (DSC) problem for an islanded alternating current microgrid (MG) consisting of multiple distributed generators (DGs) subject to bounded disturbances, aiming to compensate for deviations arising from primary control. An innovative robust control strategy is proposed, which integrates a dynamic event-triggered (DET) communication mechanism with an sliding mode control. By introducing an integral term, the robustness of the system against disturbances is effectively enhanced. An event-triggered mechanism is designed based on the sliding mode and system state, effectively conserving communication resources. A variable-exponent sliding mode reaching law dynamically adjusts the exponent parameter according to the distance between the system state and the reference value, achieving faster convergence speed and higher convergence accuracy. Furthermore, on the sliding surface, DSC strategy guarantees that the voltage and frequency of the DGs under disturbance are synchronized to their reference values within a fixed-time and achieves avtive power distribution. Finally, the simulation results validate the fixed-time effectiveness, robustness against load changes, and plug-and-play capability, demonstrating that the proposed strategies based on DET can significantly reduce communication frequency.</p>

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Sliding mode-based distributed event-triggered secondary control for islanded microgrid

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Xin Li,
  • Xiaodong Wang,
  • Liangkuan Zhu,
  • Mingfei Ban

摘要

This paper investigates the fixed-time distributed secondary control (DSC) problem for an islanded alternating current microgrid (MG) consisting of multiple distributed generators (DGs) subject to bounded disturbances, aiming to compensate for deviations arising from primary control. An innovative robust control strategy is proposed, which integrates a dynamic event-triggered (DET) communication mechanism with an sliding mode control. By introducing an integral term, the robustness of the system against disturbances is effectively enhanced. An event-triggered mechanism is designed based on the sliding mode and system state, effectively conserving communication resources. A variable-exponent sliding mode reaching law dynamically adjusts the exponent parameter according to the distance between the system state and the reference value, achieving faster convergence speed and higher convergence accuracy. Furthermore, on the sliding surface, DSC strategy guarantees that the voltage and frequency of the DGs under disturbance are synchronized to their reference values within a fixed-time and achieves avtive power distribution. Finally, the simulation results validate the fixed-time effectiveness, robustness against load changes, and plug-and-play capability, demonstrating that the proposed strategies based on DET can significantly reduce communication frequency.