To obtain an independent power supply device without frequency variation that can easily starts and stops a diesel generator and has a few influence of an operational limit in light-load operation thereon.
An independent power supply device is provided with a distributed power supply 1 that utilizes natural energy and a diesel generator 5 and is separated from a commercial power supply. In the independent power supply device, a DC/AC converter 12 of which a DC side is connected to a power storage device 4 constantly and independently operates, and the diesel generator 5 is connected to the power storage device 4 through an AC/DC converter 11. By transmitting a start/stop command and a power command of power to be generated by a generator thereof to the diesel generator 5 from a controller 8, frequency variation does not occur at a power output terminal and the diesel generator 5 can be easily operated.
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami
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