Twin-shaft gas turbine power generation control apparatus system, and a control method for a gas turbine system

It can be suppressed to provide a change in outside air temperature control apparatus and a control method results in reduced efficiency of the twin-shaft gas turbine power generation system, the gas turbine system. Comprising: a high pressure turbine (3H); coupling the compressor (1) and the first rotation axis (4H) of the high pressure turbine; the electric motor and the first rotation axis (4H) of the coupling (9); adjusting the air compressor 1 is obtained quantity governor (13); a low-pressure turbine (3L); a second rotation shaft coupled to the low-pressure turbine 3L (4L); synchronous generator (7) and the second rotary shaft connected; of the synchronous generator (7 transmission frequency of the power converter is performed (10) between the conversion) and the motor (9); and based on the power output command value (18) output power to the external system (50) of the instruction, the inverter control ( 10) of the inverter control means (11) and a governor (13) is controlled, thereby controlling twin-shaft gas turbine (6) and the motor (9) a total output control means (12).