Gas turbine apparatus

A gas turbine apparatus comprising:

• a combustor for combusting fuel to produce a combustion gas;
• a turbine which is rotated by the combustion gas;
• an electric generator coupled to said turbine;
• a fuel flow control valve configured to change an opening thereof;
• a first processing unit operable to adjust the opening of said fuel flow control valve so as to maintain a rotational speed of said turbine substantially at a constant value;
• a second processing unit operable to adjust the opening of said fuel flow control valve so as to maintain a temperature of a discharged combustion gas at temperatures lower than a predetermined temperature;
• and
• an electric power controller operable to control electric power to be generated by said electric generator based on the temperature of the discharged combustion gas.

A method of controlling electric power generated by an electric generator in a gas turbine apparatus, said method comprising:

• supplying fuel through a fuel flow control valve to a combustor to produce a combustion gas;
• rotating a turbine by the combustion gas;
• adjusting the amount of fuel to be supplied through the fuel flow control valve so as to maintain a rotational speed of the turbine substantially at a constant value by using a first processing unit;
• adjusting the amount of fuel to be supplied through the fuel flow control valve so as to maintain a temperature of a discharged combustion gas at temperatures lower than a predetermined temperature by using a second processing unit;
• and
• controlling electric power to be generated by using the second processing unit.