Perturbation Observer Based Nonlinear Adaptive Controller for Frequency Synchronization in Islanded Ac Microgrid

As additional distributed energy resources (DERs) are integrated, the task of frequency control within isolated AC microgrids (MGs) grows increasingly complex. Addressing this challenge, this paper introduces a novel approach for the secondary frequency control of MGs, leveraging nonlinear adaptive control with perturbation estimation. This distributed secondary control method operates solely on its own information, reducing the reliance on full state feedback. Additionally, perturbation observers are employed to estimate and offset actual disturbances, ensuring robustness against uncertainties in parameters and unaccounted system dynamics. The efficacy of this proposed controller is validated through simulation studies conducted on a test MG system.