Grid Export Reduction Based on Time-Scheduled Charging of Residential Battery Energy Storage Systems—A Case Study in Cyprus

Photovoltaic (PV) installations grow exponentially, and the mismatch between generation and demand will adversely affect the stability of the grid. This paper presents a modified operational mode of a grid-connected hybrid PV and battery energy storage system (BESS) in Cyprus. The BESS is coupled with residential rooftop PVs and is functioning under an operational mode aiming to decrease the peak power fed into the grid by storing the excess PV generation. The stored energy is then used to cover the mismatch between generation and demand, thus also increasing the on-site PV self-consumption. Given the favourable environmental conditions in Cyprus, with increased PV generation especially during summer, a significant amount of excess PV generation exported to the grid is still observed, as the BESS is usually fully charged before noon. For this reason, a modification of the operational mode of the aforementioned BESS was performed, aiming to reduce the building’s interaction with the electricity grid during peak export hours by delaying the BESS charging process. An analysis of the system’s operation during that period and its contribution towards grid interaction limitation is presented.