Aggregation of Battery Energy Storage and Distributed Energy Resources

Battery energy storage systems (BESS) are increasingly installed in distribution grids in conjunction with other distributed energy resources (DER). These resources are photovoltaic (PV) systems and other distributed generation, including generation from renewable energy resources (RES), such as wind and small hydro. One of the roles of BESS, in support of the wide deployment of renewable energy resources, is to meet the requirement for energy balancing to mitigate resource variability and intermittency and make the combination of BESS and renewable DER dispatchable. This balancing feature is applicable to smaller, roof-top PV installations (behind the meter) connected to the low voltage (LV) grid and to larger PV or wind farms connected to medium voltage (MV) distribution feeders. In the latter case, the combined installation feeds energy directly into the distribution system.