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;
an inlet guide blade control mechanism configured to control the inlet guide vanes or blades to change air flow rate into the compressor;
a fuel control valve provided to change flow rate of the fuel into the combustor;
a speed-load control mechanism including a speed control mechanism and a load control mechanism, said speed-load control configured to operate 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;
a combustion gas temperature control mechanism 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 mechanism having a disabling mechanism responsive to operation of said system frequency abnormality sensor to make the combustion gas temperature control mechanism inoperative to thereby have said fuel control valve controlled by the speed-load control mechanism, to restore a system frequency.
0 Assignments
0 Petitions
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.
-
Citations
12 Claims
-
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; an inlet guide blade control mechanism configured to control the inlet guide vanes or blades to change air flow rate into the compressor; a fuel control valve provided to change flow rate of the fuel into the combustor; a speed-load control mechanism including a speed control mechanism and a load control mechanism, said speed-load control configured to operate 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; a combustion gas temperature control mechanism 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 mechanism having a disabling mechanism responsive to operation of said system frequency abnormality sensor to make the combustion gas temperature control mechanism inoperative to thereby have said fuel control valve controlled by the speed-load control mechanism, to restore a system frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- and an electric generator connected to an electric power system;
Specification