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We propose a decentralized control synthesis procedure for stabilizingvoltage and frequency in AC Islanded microGrids (ImGs) composed of DistributedGeneration Units (DGUs) and loads interconnected through power lines. Thepresented approach enables Plug-and-Play (PnP) operations, meaning that DGUscan be added or removed without compromising the overall ImG stability. Themain feature of our approach is that the proposed design algorithm isline-independent. This implies that (i) the synthesis of each local controllerrequires only the parameters of the corresponding DGU and not the model ofpower lines connecting neighboring DGUs, and (ii) whenever a new DGU is pluggedin, DGUs physically coupled with it do not have to retune their regulatorsbecause of the new power line connected to them. Moreover, we formally provethat stabilizing local controllers can be always computed, independently of theelectrical parameters. Theoretical results are validated by simulating in PSCADthe behavior of a 10-DGUs ImG.

A scalable line-independent design algorithm for voltage and frequency control in AC islanded microgrids