Optimal siting, sizing and setting of droop-controlled DERs in autonomous microgrids: A new paradigm in microgrid planning

•A novel stochastic-robust approach is developed for energy communities.•Individual and collective assets are considered and analysed.•The problem is solved using a novel three-stage procedure.•Operating cost is incremented 77$ when the degree of robustness grows.•Collective storage systems help to reduce unserved demand and wasted generation.