Sumitomo Electric Industries Limited has successfully installed and demonstrated a MW-class concentrating photovoltaic (CPV)/energy storage system on the premises of its Yokohama Works in Japan.

The system consists of 28 units of CPV (maximum total power generation of 200 kW) and a large redox flow battery (capacity of 1 MW x 5 hours), which respectively functions as a storage facility for the power generated by the CPV units.

The system employs an energy management system (EMS), which monitors the amount of CPV-generated power, battery storage and power consumption, and stores the measurement data in the central server.

If connected to external commercial power networks, the system can also store electricity from power companies during periods of low demand, such as at night.

Sumitomo cooperated with Nissin Electric Company Limited., Sumitomo Densetsu Compnay Limited and Meidensha Corporation on the development of the system.

According to Sumitomo, this marks an important technology development, particularly for Japan, which continues to suffer from power shortages.

With the greater introduction of intermittent renewable energy sources such as solar and wind power, the use of a redox flow battery will help to stable the power supply, and thus contribute to the alleviation of power shortages.

Sumitomo Electric, in partnership with Meidensha, is also working on a demonstration test for a factory energy management system (FEMS), which combines the Yokohama Work’s existing gas engine power generators with the redox flow battery and the CPV units to create a management system that controls the entire energy flow in site.

Both systems are aimed at high energy users such as industrial plants and commercial facilities, with commercialization planned for the next fiscal year 2013-14.

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