Analysis of the distributed residential energy storage impact on the grid operation

The mismatch between the house demand and the Photovoltaic (PV) generation profiles brings the need to export to the grid a significant part of the locally generated energy, even though the same amount of energy is later imported back for local consumption. Meanwhile, the utilization of energy storage is many times discussed as being or not the best option, since in some periods the injection into the grid can bring benefits. In this work, an assessment of the grid energy balancing impact achieved with or without energy storage is conducted. A storage management strategy is proposed that coordinates the surplus PV generation with the surplus demand on a daily time frame, and reduces the maximum peaks of both. This assessment is done for different levels of residential PV penetration in Southern Europe and comparing the proposed storage management with other specific storage roles.