ET-ADRC Control for Distributed Secondary Voltage Regulation in Islanded Microgrids

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This paper presents a distributed event-triggered active disturbance rejection control (ET-ADRC) framework for secondary voltage regulation in islanded microgrids, effectively addressing both system uncertainties and communication constraints. The proposed solution employs a model-free design that inherently accommodates microgrid-specific characteristics, including line impedance variations, parameter uncertainties, and load fluctuations, while ensuring robust plug-and-play capability. Utilizing dynamic compensation complemented by an Extended State Observer-based estimation scheme, the approach eliminates the need for physical differentiators while maintaining system stability. The implementation incorporates dual independent event-triggering mechanisms that optimize communication resources while guaranteeing Zeno-free operation, the asymptotic boundedness of both observation and consensus errors for precise voltage tracking, thereby providing rigorous guarantees for closed-loop system stability.

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