Electricity Market Mechanisms for Aggregators and Current State Analysis in Turkey

The share of renewable energy sources (RES) in electric power systems has been increasing tremendously given the reduction in their capital costs and incentives for renewable generation. This necessitates an increase in flexibility of power systems, which could be described as the capability of power grids in responding to a supply-demand mismatch. Aggregators provide flexible services in distribution grids. This study focuses on electric market mechanisms, which the aggregators provide services, and the players' roles in such market mechanisms. In this regard, the most prevailing international market mechanisms and general trends are addressed, along with the required coordination between transmission system operators (TSO) and distribution system operators (DSO) in such mechanisms. Computer simulation analysis is performed to illustrate the importance of this coordination, particularly after photovoltaic (PV) solar generation in distribution grids. Finally, relevant legislations and current implementations in Turkey are investigated along with recommendations.