Kinden Sets Up 1MWh NAS Battery, PV System at Its Building (1)

BCP measures, peak shift adjustment tested

2016/09/22 17:06
Kenji Kaneko, Nikkei BP CleanTech Institute
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Kinden Corp introduced a stationary-type storage battery and a solar power generation system in its headquarters building in Kita-ku, Osaka Prefecture, Japan, Feb 25, 2016. An NAS (sodium-sulfur) battery featuring an output of 180kW and a capacity of about 1MWh, manufactured by NGK Insulators Ltd, as well as Sharp Corp's solar panels with 30kW of output, were installed on the rooftop. The introduction of a medium-capacity NAS battery for outdoor use was the first case in Japan, according to the company (Fig. 1).

Fig. 1 The NAS battery installed on the Kinden headquarters building in Osaka City (Source: Kinden Corp)

Feasibility of storage battery/DC power supply system reviewed by in-house WG

The system levels the demand for power by peak shift at normal times and supplies power by independent operation as one of the BCP (business continuity planning) measures during emergencies. The company developed proprietary control software and will accumulate operational knowhow by demonstrative operation of the system, aiming to use the knowhow to create a storage battery system intended for customers in the future.

The introduction of the storage battery system for validation is associated with an in-house working group (WG) that the company established in November 2012. A rapid increase in the introduction of solar power plants was expected following the start of the feed-in tariff (FIT) scheme in July 2012.

Solar power generation is characterized by large output fluctuation and DC output. Some people in the company began to anticipate "the increase in needs for storage battery systems and DC distribution systems in the near future in the electrical equipment installation business," and a WG consisting of about 10 in-house specialists started research and study.

While some of the WG members were skeptical, saying, "Storage batteries and DC distribution systems experienced booms several times in the past, but the introduction was always limited," others said, "They may become widely used this time because solar power is being introduced on a large scale following the start of the FIT scheme." The conclusion was drawn in about one and a half years, having also listened to the opinions of external specialists.