Graphic Tohoku University Japan 800 DC power supply LED lighting

"In places where people are often in and out of the establishment of up to about 800 support DC power supply LED lighting, which is probably the world's first" (Tohoku University Japan Graduate School of Environmental Sciences, director of the Department of Taro Kazumiyuki).

The real estate consumer and the disaster of Tohoku University Japan Graduate Institute of Environmental Science in order to achieve energy when the power to ensure that as the goal, in the Department of the school introduced a solar battery, storage battery and DC power supply technology and the intelligent hybrid AC / DC control system ", 1). The system has been running since the end of November 2012 (Figure 1).

DC part emergency switching panel

Figure 1:60kW solar module and LED lighting for DC power supply

Tohoku University Japan on the roof of the building is equipped with a 60kW solar cell module (a). In the future, it is scheduled to install solar cooling water pipes in summer. In the main building and teaching upstairs set up 800 DC power supply LED lighting (B).

The system is mainly composed of large-scale storage system of 60kW solar cell module and 57.6kWh, also can supply 300V DC (direct current) and 100V or 200V alternating current (AC) of the AC / DC hybrid control system, and the implementation of the management of the whole system "EMS (energy management system)".

Through the development of solar cells do not sell electricity, but directly for the battery consumption by their own. In addition to the emergency energy movement as the goal, the pure electric vehicle (EV) fast charging. The solar cell is installed on the roof, and the storage battery and AC / DC hybrid control system is installed on the main building. In the 6 storey main building and the DC power supply upstairs, the introduction of about 800 DC 300V support LED lighting.

Equipped with about 10 thousand batteries

Solar cell module, high voltage DC power supply system, as well as DC power supply LED lighting by the Taiwan Delta Electronics (DELta) of the Japanese company. LED lighting through the internal DC to DC converter from 300V to 24V after decompression. Open and close operation to prevent the risk of electric shock by using the switch to control the low voltage part of the DC to DC converter instead of the power line.

Large storage systems developed by SONY (Figure 2). The system consists of 8 7.2kWh storage units. The battery management system of power storage unit by the control department, control of the power storage unit between the implementation of 8kW AC DC converter, with solar cell with 10kW MPPT DC - DC converter, battery monitoring unit, and a 6 1.2kWh storage module.

Figure 2: setting the 57.6kWh storage unit

On the first floor of the main building, there are 8 storage units. Each is 7.2kWh. Storage unit equipped with 6 1.2kWh power module.

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