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'DC Microgrid' Installed for Efficient Energy Use in Island

2014/04/09 18:48
Kenji Kaneko, Nikkei BP CleanTech Institute
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An industry-university research group started an operation test of a "system that supplies direct-current (DC) electricity using natural energy" in Nushima (island), Minamiawaji City, Hyogo Prefecture, Japan, in April 2014.

The group consists of researchers from Kobe University, the Hyogo Prefectural Institute of Technology, etc.

For the system, the group installed a DC microgrid (small-scale power grid) in a facility by using solar power generation and storage battery systems. It will try to reduce power demand through visualization of power being consumed at general households and demand response.

The solar power generation and storage battery systems were installed on three sites in Nushima. The output capacity of a solar power generation system and the capacity of a storage battery system are 18kW and 46kWh at Nushima Elementary School, 10kW and 23kWh at Nushima Sogo Center and 8kW and 23kWh at an apartment building for teachers.

DC electricity generated by the solar power generation system is stored in the storage battery system as it is and used for LED lamps, air conditioners, TVs and personal computers that can be powered by DC electricity. Alternating-current (AC) grid electricity is converted to DC electricity and used as auxiliary power.

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