Patent ID: 7010922
Filing Date: 2006-03-14
Classification: F01K,Y02E

Abstract:
1. A method of operating a single shaft combined cycle power plant, including the steps of: driving a generator by a gas turbine and a steam turbine; and separating the steam turbine from a coupled unit of the generator and the gas turbine according to a load of the generator to drive the generator by the gas turbine solely, wherein the method further includes the steps of: when the load of the generator decreases, reducing the rotation speed of the steam turbine below a rated rotation speed, separating the steam turbine from the coupled unit of the generator and the gas turbine, and maintaining the rotation speed of the steam turbine at a speed corresponding to that at the time of separating the connection; and when the load of the generator increases, increasing the rotation speed of the steam turbine to the rated rotation speed and connecting the steam turbine to the coupled unit of the generator and the gas turbine.