Gas turbine control system
First Claim
1. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a set temperature value;
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation; and
said combustion gas temperature control means having disabling means responsive to operation of said system frequency abnormality sensor to make the combustion gas temperature control means inoperative to thereby have said fuel control valve controlled by the speed-load control means, to restore a system frequency.
1 Assignment
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Accused Products
Abstract
A gas turbine control system is disclosed which operates to stabilize the system frequency in a case of transitional variations of the system frequency without making the strength of hot gas path parts of the gas turbine below a maximum stress value of the hot gas path parts. When a system frequency abnormality is detected, the output of the gas turbine is adjusted to recover the system frequency by making a gas turbine combustion gas temperature control inoperative. For this purpose, there are provided a logical circuit operative to make the gas turbine combustion gas temperature control disabled or inoperative in response to an abnormal system frequency detection signal, and a recovery circuit that operates to cancel the inoperative state of the gas turbine combustion gas temperature control. The detection of an abnormal system frequency may be carried out by an outside signal. An abnormality detection unit may be provided in a combined cycle plant.
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Citations
22 Claims
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1. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a set temperature value;
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation; and
said combustion gas temperature control means having disabling means responsive to operation of said system frequency abnormality sensor to make the combustion gas temperature control means inoperative to thereby have said fuel control valve controlled by the speed-load control means, to restore a system frequency. - View Dependent Claims (2, 15, 16)
- and an electric generator connected to an electric power system;
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3. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
normal combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a normal combustion gas temperature limit value;
emergency combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed an emergency combustion gas temperature limit value; and
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation;
switching means that operates in response to operation of said system frequency abnormality sensor to make said normal combustion gas temperature control means inoperative and make said emergency combustion gas temperature control means operative, whereby output of the gas turbine is controlled to stabilize a system frequency. - View Dependent Claims (4, 5, 6, 7, 8, 9, 17, 18, 19, 20, 21, 22)
- and an electric generator connected to an electric power system;
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10. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator driven by gas turbine unit and connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor, said inlet guide blade control means being changeable between a normal inlet guide blade control mode and an emergency inlet guide blade control mode;
a fuel control valve provided to control flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a combustion gas temperature limit value;
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation; and
changeover means that operates in response to operation of said system frequency abnormality sensor to change over the inlet guide blade control means from said normal inlet guide blade control mode to said emergency inlet guide blade control mode, whereby output of the gas turbine is controlled to stabilize a system frequency. - View Dependent Claims (11, 12)
- and an electric generator driven by gas turbine unit and connected to an electric power system;
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13. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator driven by the gas turbine unit and connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a set temperature value;
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation; and
limiter means for limiting a response of said speed control means of the speed-load control means in response to operation of said system frequency abnormality sensor, for a length of time within which the system frequency is expected to recover.
- and an electric generator driven by the gas turbine unit and connected to an electric power system;
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14. A gas turbine control system for controlling a gas turbine unit including an air compressor for producing compressed air, said compressor having inlet guide vanes or blades for adjusting an air flow rate into the compressor, a combustor for combusting a fuel mixed with the compressed air from the compressor to produce a combustion gas, a gas turbine receiving the combustion gas from the combustor and driven by the combustion gas to drive the compressor;
- and an electric generator driven by the gas turbine unit and connected to an electric power system;
said gas turbine control system comprising;
inlet guide blade control means that controls the inlet guide vanes or blades to change the air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
speed-load control means including a speed control means and a load control means, said speed-load control means operating on said fuel control valve to control the flow rate of the fuel so that the gas turbine has a rotational speed coinciding with a set speed value;
combustion gas temperature control means that controls the flow rate of the fuel so that the combustion gas temperature does not exceed a set temperature value;
a system frequency abnormality sensor that operates to detect such a variation of frequency of the electric power system as to cause the power system to go out of normal operation; and
limiter means for changing a control constant for use in control of the flow rate of the fuel in response to an increase of the system frequency as detected by said system frequency abnormality sensor, to prevent loss of flame of the turbine.
- and an electric generator driven by the gas turbine unit and connected to an electric power system;
Specification