Twin-shaft gas turbine including a control system for adjusting the compressor inlet guide vane angle to optimize engine transient response
View Patent ↗A twin-shaft gas turbine 1 , which has a gas generator 2 including a compressor 7 , a combustor 8 , and a high-pressure turbine 9 , is configured to make a first control mode and a second control mode selectively usable for control of the gas generator. In addition, in the first control mode, an IGV angle in the compressor is controlled in accordance with a corrected shaft rotation speed of the gas generator, and in the second control mode, the IGV angle is controlled to maintain a constant gas generator shaft rotation speed. Furthermore, the first control mode is used to start, to stop, and to operate the turbine under fixed or lower load conditions, and that the second control mode is used under operational states other than those to which the first control mode is applied.
1. A twin-shaft gas turbine with a gas generator, the gas turbine comprising:
a compressor for generating compressed air;
a combustor for generating combustion gases by burning a fuel mixedly with the compressed air supplied from the compressor; and
a high-pressure turbine rotationally driven by the combustion gases supplied from the combustor, the high-pressure turbine being used to generate a driving force of the compressor;
wherein a first control mode and a second control mode are selectively usable for control of the gas generator,
in the first control mode, an IGV angle in the compressor is controlled in accordance with a corrected shaft rotation speed of the gas generator,
in the second control mode, the IGV angle is controlled to maintain a constant rotation speed of the gas generator shaft,
the first control mode is used to start, to stop, and to operate the turbine under fixed or lower load conditions, and
the second control mode is used under operational states other than those to which the first control mode is applied.
2. The twin-shaft gas turbine according to claim 1 , wherein intervention of a third control mode in which a constant IGV angle is maintained independently of a rotation speed of the gas generator shaft is enable during a mode change between the first control mode and the second control mode.
3. A method for controlling operation of a twin-shaft gas turbine with a gas generator, the gas generator comprising: a compressor having an inlet guide vane, the compressor being used for generating compressed air; a combustor for generating combustion gases by burning a fuel mixedly with the compressed air supplied from the compressor; and a high-pressure turbine rotationally driven by the combustion gases supplied from the combustor, the high-pressure turbine being used to transmit a driving force to the compressor via a gas generator shaft, the method including:
a first control mode in which an opening angle of the inlet guide vane of the compressor is controlled on the basis of a corrected rotation speed of the gas generator shaft; and
a second control mode in which the opening angle of the inlet guide vane of the compressor is controlled to maintain a constant rotation speed of the gas generator shaft,
wherein the twin-shaft gas turbine, depending upon an operational state thereof, selectively uses the first control mode or the second control mode.
4. The method for controlling twin-shaft gas turbine operation according to claim 3 , wherein
the first control mode is selected in a first operational state that is either a starting operational state, a stopping operational state, or a low load operational state under fixed or lower load conditions, and
the second control mode is selected in a second operational state that is a high load operational state.
5. The method for controlling twin-shaft gas turbine operation according to claim 3 , wherein
a third control mode for maintaining a constant angle of the inlet guide vane of the compressor independently of a rotation speed of the gas generator shaft is executed during a mode change between the first control mode and the second control mode.