Stability Analysis and Design of Local Control Schemes in Active Distribution Grids

The connection of distributed energy resources (DERs) to distribution feeders can significantly increase the operational flexibility system operators. Local feedback control schemes (such as Volt/VAr droop curves) are a cheap, scalable, and communication-free solution DERs in active grids. However, these controllers interfere detrimentally with each other when they act on multiple connected same grid. We show that even standardized curves recommended most recent grid codes may exhibit an unstable behavior. In this paper, we investigate stability local incremental DER laws three-phase grids balanced, unbalanced loading, bound resulting rate convergence. use low-pass filters set-points allows us achieve closed-loop for high-gain would otherwise destabilize This feature is particularly relevant data-driven approaches yield optimal schemes, often form steep customized piece-wise linear curves.