Abstract
Due to the ageing of network infrastructure, the increasing load demand in distribution networks together with the increased installation of photovoltaic (PV) in the medium-voltage (MV) and low-voltage (LV) network, there is a need for network reinforcement. As load growth congests the grid, the strategic placement of electric storage systems can be an alternative to or contribute to a deferral of grid investments. To study this, an optimisation problem solving the dual-purpose deployment of prosumers' level battery storage system has been formulated and will be presented in this study. The MV/LV substation loadings are compared for the 0% prosumers and 100% prosumers scenarios with PV-battery system. The results of the analysis show that the absolute peak at secondary substation decreases by 8.74% and the average day peak drops by 17% while the total annual energy drawn from the grid reduced by 8.41% with the 100% prosumers scenario. Furthermore, by using household-level battery systems for peak shaving of local loads one can achieve a deferral of overloading by 3 years at MV/LV substation.
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