I. Introduction
Centralized power generation, unidirectional power flow, passive electricity distribution, and demand-driven operation are concepts coined more than one century ago, when the first power systems were designed. In the last decades, modern solutions such as distributed generation (DG), mainly based on renewable energies, electrical energy storage (EES), flexible ac transmission systems, active demand management (ADM), microgrids, and smart control and management based on information and communication technologies (ICTs), have made it possible to plan new horizons for conventional power systems. However, not all the work for planning the future power systems is concluded yet, as an intensive research effort should be still conducted to make such advanced systems a reality today.