Storage battery manufacturer GS Yuasa Corporation has been accelerating its large storage battery business for stabilization of grid networks.

GS Yuasa started its business of large storage batteries intended for grids in Chile. The company delivered a Li-ion storage battery system featuring 20MW of output and 6.3MWh of capacity to the "Cochrane Coal-Fired Thermal Power Plant" in Cochrane in the northern part of Chile in 2012.

Power generators in some regions of Chile are required to save a certain amount of power generation capacity as a spinning reserve, which resulted in opportunity loss. If the spinning reserve is ensured by a storage battery system, the facilities can be operated at maximum output.

The company took part in validation projects in Japan and introduced large storage batteries to isolated islands to solve the problem of frequency fluctuation due to the increase in introduction of renewable energy generated by using solar, wind and other sources.

For example, the company installed its 4MW/1.6MWh storage battery system on Iki Island, Nagasaki Prefecture, and conducted a validation test on control of short-cycle frequency fluctuation in 2013 and 2014, jointly with Toshiba Mitsubishi-Electric Industrial System Corp (TMEIC), which offered power conditioners, and Mitsubishi Electric Corp, which handled construction of the entire system.

The company also introduced a 2MW/0.7MWh storage system to Oki Islands, Shimane Prefecture, and validated the system regarding effective charge/discharge control for reduction of short-cycle fluctuation from fiscal 2015 to 2017.

Taking advantage of the achievements and results of the validation projects, the company received an order for a 10MW/6.75MWh storage battery system from Obayashi Corp for installation in the "Kushiro Town Toritoushi Plain Solar Power Plant," a 17.9MW mega (large-scale) solar power plant. The operation was started in April 2017 (Fig. 1). It was the first domestically manufactured large storage battery installed in Hokkaido for grid stabilization.

Fig. 1: The 10MW/6.75MWh storage battery system attached to the Kushiro Town Toritoushi Plain Solar Power Plant (source: Nikkei BP)