Optimal Allocation of ESSs in Active Distribution Networks to Achieve Their Dispatchability

This paper presents a method for the optimal siting, and sizing of energy storage systems (ESSs) in active distribution networks (ADNs) to achieve their dispatchability. The problem formulation accounts uncertainty inherent stochastic nature distributed sources, loads. Thanks operation ESSs, main optimization objective is minimize dispatch error, which mismatch between realization, prediction power profile at ADN connecting point upper layer grid, while respecting grid voltages, ampacity constraints. proposed relies on so-called Augmented Relaxed Optimal Power Flow (AR-OPF) method: it expresses convex full AC flow, proven provide global optimal, exact solution case radial grids. AR-OPF coupled with dispatching control resulting two-level problem. In first block, site, size ESSs are decided along level dispatchability that can achieve. Then, second adequacy ESS allocations, feasibility operating points verified over scenarios using Benders decomposition technique. Consequently, size, site adjusted. To validate method, simulations conducted real Swiss hosting large amount Photovoltaic (PV) generation.