DC power supply utility and DC micro grid using this

摘要

The object is to provide a DC power utility system that can first and preferably supply DC power specifically from a solar battery, and that can utilize the power generated by the solar battery as much as possible even when the magnitude of solar radiation changes. A DC power utility system includes: at least one DC power supply that generates a DC output; a commercial AC power supply; a DC converter that converts to DC in the commercial AC power supply; and a DC load device receiving a DC supply from both the at least one DC power supply and the commercial power supply converted to DC, wherein a backflow prevention diode is individually connected between the at least one DC power supply and the DC power supply DC load device and between the DC-DC converter and the DC load device is connected, and a power supply priority supply device, which preferably supplies power to the DC load device from the DC power supply side, is connected.