Patent ID: 10184406

Abstract:
A multi-shaft variable speed gas turbine apparatus includes a multi-shaft gas turbine having a gas turbine compressor, a gas turbine burner, a gas generator provided with a first turbine for rotationally driving the gas turbine compressor, and a power turbine, provided with a second turbine that is mechanically separated from the gas generator, rotationally driven by exhaust gas of the gas generator, and having a main generator. A sub-electric motor/generator is connected to the gas generator, and a frequency converter controls the sub-electric motor/generator. A fuel flow rate control valve adjusts output using a fuel flow rate to be injected into the gas turbine burner. Variation of the fuel flow rate is restricted, and a control device determines a drive load of the gas turbine compressor in accordance with an output load for a request load, and controls the sub-electric motor/generator using the frequency converter.