JAUE2022-073: Optimum Sizing of Commercial Photovoltaic Battery System for Load Leveling

Abstract

Solar photovoltaic (PV) is a reliable and clean technology for utilization, whereas the consequent intermittent and stochastic characteristics of non-dispatchable renewable energy can bring about instability in power systems. Battery storage provides an effective solution to alleviate the burden of intermittent photovoltaic production on the grid. Despite several existing works dedicated to the evaluation of photovoltaic battery systems, the research on system sizing and operation strategy still has substantial areas to be explored such as battery systems also used for load balancing in the commercial system. In this study, the mathematical battery model which mixes photovoltaic power generation and balances the user's electrical load is developed to investigate system technical and economic performance based on different optimization purposes 1. the stability of public grid load; 2. the stability of user load; afterward, the objective function is established based on Load factor, net present value. Results indicate that the increase in PV size will increase the user’s revenue and reduce the power supplier’s revenue. The optimal size of BESS is between 15,000 and 20,000 kWh depending on different PV sizes.