Patent ID: 7061211

Claim:
A gas turbine generating apparatus comprising: a gas turbine capable of a high-speed operation; a permanent-magnet-type generator driven by said gas turbine at a high speed; an inverter device for converting alternating-current power generated by said permanent magnet type generator into commercial alternating-current power; and a control device for operating said permanent-magnet-type generator as a motor at a time of starting said gas turbine, and supplying alternating-current power from a direct-current power supply through said inverter device or another inverter device in addition to said inverter device to said permanent magnet type generator for increasing a rotational speed smoothly from zero; wherein said control device detects output current of said inverter device and controls said inverter device to keep the output current constant by supplying a rated current of said permanent magnet type generator constantly to said permanent magnet type generator.