Patent ID: 7143584

Claim:
A gas turbine apparatus comprising: a turbine for providing rotational force; a combustor for burning a mixture of air and fuel and providing said turbine with a combustion gas to drive it; a generator connected to said turbine to receive the rotational force to generate electric power; a temperature sensor for measuring a temperature of an exhaust gas from said turbine; temperature setting means for setting a target temperature of said exhaust gas as a first set temperature, a second set temperature higher than said first set temperature, a third set temperature higher than said second temperature, and a fourth set temperature smaller than said first set temperature; and power setting means connected to said temperature sensor and temperature setting means, for setting a set output power of said generator as follows: a first set output power is set when starting-up said-generator; said first set output power of said generator is decreased at a first rate when said exhaust gas temperature measured by said temperature sensor reaches said second set temperature; a currently set output power of said generator is decreased at a second rate higher than said first rate when said exhaust gas temperature reaches said third set temperature after decreasing said set output power at said first rate; and a currently set output power of said generator is increased at a third rate smaller than said second rate when said exhaust gas temperature reaches said forth set temperature after decreasing said set output power at said second rate.