Distributed Secondary Voltage and Frequency Control in Islanded AC Microgrids Using a Fixed-Time Observer Framework
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Abstract
Islanded AC microgrids operate without the support of a main grid, requiring robust voltage and frequency regulation to maintain stability and reliability. This research introduces a distributed secondary control framework employing a fixed-time observer for accurate voltage and frequency tracking. Unlike conventional distributed control strategies, the proposed approach ensures convergence within a predetermined fixed time, enhancing transient response and system resilience. The framework integrates cooperative secondary control, adaptive estimation, and event-triggered updates to achieve optimal microgrid performance. Simulation studies and analytical evaluations demonstrate the effectiveness of the proposed method in maintaining voltage and frequency stability under dynamic load conditions, power generation variability, and communication delays. Results indicate significant improvements over conventional distributed strategies in terms of convergence speed, robustness to disturbances, and operational flexibility.
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