Patent ID: 8084892

Claim:
A power supply device applied to a power generation system including a power generation apparatus for generating electricity by natural energy and a power-converting section including a first converter for converting alternating-current power received from the power generation apparatus into direct-current power and a second converter for converting the direct-current power into alternating-current power matching a frequency of a utility grid, to supply power to auxiliary machines for the power generation apparatus, the power supply device comprising: a switching section that is connected to a direct-current link between the first converter and the second converter via a third converter for converting direct-current power supplied from the direct-current link into alternating-current power to form a first path, that is connected between the power-converting section and the utility grid to form a second path, and that is connected to the auxiliary machines to form a third path, the switching section switching between connection of the third path to the first path and connection of the third path to the second path.