電力データを用いた家庭用太陽光発電・ 蓄電システムの経済性評価

抄録

Battery is a key technology in the transition to a low-carbon and resilient energy system. Recently in Japan, residential PV battery system is considered as one of the most promising applications; however, its impacts had not been fully assessed. This study evaluates the effects of residential PV battery system for end-users under various conditions on geological, technological and socio-economic factors. Regional diversity is considered by using data on residential power consumption and PV power generation that were collected from over 40 thousand all-electric houses in Japan. Scenario analysis and sensitivity analysis are performed to evaluate the effects of uncertain parameters on the system’s performances. Simulation results suggest that economic benefits of the system can be improved by changing battery operation mode at the end of purchase period for PV under Feed-in Tariff (FiT) scheme and the benefits should vary depending on the region. The results also indicate that PV self-consumption rate is over 50% when charging the battery with surplus power. Sensitivity analysis results suggest that the unit prices of grid electricity and the purchasing price of surplus power after FiT scheme should have large influences on the economic benefits of the system.