Abstract
This paper proposes design of a robust adaptive secondary controller for a stand-alone AC microgrid system. The proposed controller is designed based on the fixed-time confluence property of Lyapunov functions. Despite unknown disturbances, the proposed approach has the major benefit of precise sharing of active and reactive power as well as restoring of voltage and frequency reference values before the appropriate pre-determined time. The tuning of the proposed controller is quite simple as compared to the conventional ones. Furthermore, the proposed adaptive control scheme also has a basic mathematical formulation, making it simple to implement. To exemplify the efficacy of the proposed control methodology, simulations are conducted and its performance is compared with conventional secondary controller. From analysis of the results, it is confirmed that the proposed controller exhibits superior performance in terms of voltage and frequency tracking in face of uncertainties and load fluctuations.
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