To shorten withstant voltage-starting time required at starting time by arranging a starting inverter circuit in a starter of a turbine generator.

This turbine power generation system has an inverter control circuit 42 for inactivating a pulse width modulating power generation inverter 16 connected to the turbine generator 10, a first switch means 34 for connecting an internal power source 18 to the turbine generator 10, and the inverter control circuit 42 for supplying electric power to the turbine generator 10 from a starting inverter 32 for accelerating up to a prescribed starting speed by driving the turbine generator 10 up to a purge speed.