Analysis and Operational Records of NAS Battery

The battery energy storage system (BESS) has become indispensable in modern power systems. Although it does not generate energy, its function of "save/storing" seems to be a saviour to both operation and planning of power systems. Among various types of new battery systems, NAS (Sodium and Sulfur) battery is one of the most promising device. The commercial implementation of NAS battery system in demand side has risen quickly in Japan. The total commercial accumulated implementation in demand side has already reached to 100 MW on February in 2006. A 1000 kW NAS battery system has been working in Meisei University since august in 2002. In this paper the analysis based on recorded practical operation data in Meisei University is presented. The performance of the system seems to be very stable and effective. The battery energy storage system (BESS) has become indispensable in modern power systems. Although it does not generate energy, its function of "save/storing" seems to be a saviour to both operation and planning of power systems. Among various types of new battery systems, NAS (Sodium and Sulfur) battery is one of the most promising device. The commercial implementation of NAS battery system in demand side has risen quickly in Japan. The total commercial accumulated implementation in demand side has already reached to 100 MW on February in 2006. A 1000 kW NAS battery system has been working in Meisei University since august in 2002. In this paper the analysis based on recorded practical operation data in Meisei University is presented. The performance of the system seems to be very stable and effective