A scalable line-independent design algorithm for voltage and frequency control in AC islanded microgrids
It addresses the challenge of scalable and plug-and-play control for distributed generation units in islanded microgrids, offering a line-independent design that avoids retuning when units are added or removed.
The paper proposes a decentralized control synthesis for voltage and frequency stabilization in AC islanded microgrids that is line-independent, enabling plug-and-play operations. Simulations on a 10-DGU system validate the approach.
We propose a decentralized control synthesis procedure for stabilizing voltage and frequency in AC Islanded microGrids (ImGs) composed of Distributed Generation Units (DGUs) and loads interconnected through power lines. The presented approach enables Plug-and-Play (PnP) operations, meaning that DGUs can be added or removed without compromising the overall ImG stability. The main feature of our approach is that the proposed design algorithm is line-independent. This implies that (i) the synthesis of each local controller requires only the parameters of the corresponding DGU and not the model of power lines connecting neighboring DGUs, and (ii) whenever a new DGU is plugged in, DGUs physically coupled with it do not have to retune their regulators because of the new power line connected to them. Moreover, we formally prove that stabilizing local controllers can be always computed, independently of the electrical parameters. Theoretical results are validated by simulating in PSCAD the behavior of a 10-DGUs ImG.