連続する太陽光エネルギー低資源量日の発生頻度と同時発生範囲の評価

抄録

Ground-level solar energy fluctuates owing to weather variation, which causes variation in power supply from photovoltaic (PV) generation systems. As more PV generation systems are installed, decrease in the solar energy could cause a substantial decrease in energy supply from PV generation systems. This work investigated consecutive days of significantly low surface global horizontal solar irradiance (GHI) focusing on two features: frequency of occurrence and area of simultaneous occurrence. The results showed that longer periods of low surface GHI were associated with smaller areas of simultaneous occurrence. Assuming that a significant case involves consecutive days of significantly low surface GHI occurring simultaneously at more than half of all the stations, the longest significant case was 4 days, occurring once every 2 or 3 years.