Droop-Free Sliding-Mode Control for Active-Power Sharing and Frequency Regulation in Inverter-Based Islanded Microgrids

Carlos Xavier Rosero (), Milton Gavilánez and Cosme Mejía-Echeverría
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Carlos Xavier Rosero: Faculty of Engineering in Applied Sciences, Universidad Técnica del Norte, Ibarra 100103, Ecuador
Milton Gavilánez: Faculty of Engineering in Applied Sciences, Universidad Técnica del Norte, Ibarra 100103, Ecuador
Cosme Mejía-Echeverría: Faculty of Engineering in Applied Sciences, Universidad Técnica del Norte, Ibarra 100103, Ecuador

Energies, 2023, vol. 16, issue 18, 1-14

Abstract: This paper introduces a simple decentralized sliding-mode (SM) approach to control active power sharing by regulating the local frequency in inverter-based islanded microgrids (MGs). Its sliding surface arises from the frequency correction term introduced in the droop-free technique; it relates local active power to neighboring MGs’ active power by considering available communications among voltage source inverters. Then, this schema allows one to avoid hierarchical control just as the droop-free method does, and the benefits associated are twofold. First, it reduces the steady-state frequency error while providing accurate active power distribution. Second, the system stays reliable, withstands uncertainties, and provides a fast transient response. A Lyapunov analysis confirms stability, and simulations on a realistic four-inverter MG platform substantiate the control scheme’s effectiveness. Its performance regards frequency regulation while achieving active power sharing, stability, and robustness against clock drifts and load steps.

Keywords: sliding surface; voltage source inverter; nonlinear control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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