Gas turbine output correction method, control method, device for executing these methods, and program product

Abstract

The output corrector includes: a correction coefficient generator that generates a correction coefficient; an output corrector that uses the correction coefficient to correct the control output; and an output receiver that receives output from an output meter that detects the gas turbine output. The correction coefficient generator includes: a first coefficient element calculator that calculates a first coefficient element; a second coefficient element calculator that calculates a second coefficient element; and a correction coefficient calculator that calculates the correction coefficient using the first and second coefficient elements. The first coefficient element represents the ratio of the immediately previous output in the immediately previous time period to a reference output at a past reference time point. The second coefficient element represents the ratio of the current output in the current time period to the immediately previous output.

Description

Technical Field

[0001] The present invention relates to a gas turbine output correction method and a control method, an apparatus for executing these methods, and a program for causing a computer to execute these methods.

[0002] This application claims priority based on patent application No. 2020-179110 filed in Japan on October 26, 2020, and incorporates the contents thereof herein. Background Art

[0003] During long-term operation, a gas turbine's output decreases due to deterioration in turbine performance, such as compressor degradation. When controlling a controlled object in a gas turbine, the gas turbine's control output is used to generate a control signal for the controlled object. Even if gas turbine performance deteriorates, using the control output from before the deterioration prevents proper control of the controlled object.

[0004] Therefore, Patent Document 1 below discloses a method for correcting the control output. In this method, the gas turbine's control output is multiplied by a correction coefficient to obtain a corrected control output, which is then used to generate a control signal for the controlled object. An example of a control output is the output when the turbine inlet gas temperature reaches 1500°C. In this method, when the measured output from the output meter changes under certain conditions, the ratio of the output before and after the change is used as the correction coefficient. Specifically, the correction coefficient represents the rate of decrease in the output after the change relative to the output before the change.

[0005] Previous technical literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2007-309279 Summary of the Invention

[0008] Technical issues to be solved by the invention

[0009] The technique described in Patent Document 1 above enables appropriate control of the controlled object by correcting the control output using a correction factor, representing the rate of decrease in the gas turbine's output, when the gas turbine is operated continuously for an extended period. However, the technique described in Patent Document 1 fails to appropriately reflect the degree of output degradation when, for example, the gas turbine is stopped after operation for repairs to improve gas turbine performance. Consequently, the technique described in Patent Document 1 may result in problems in controlling the controlled object.

[0010] Therefore, an object of the present invention is to provide a technology for obtaining a control output capable of suppressing the occurrence of a control failure of a controlled object associated with gas turbine performance degradation.

[0011] Means for solving technical problems

[0012] In an output corrector of a gas turbine as one embodiment for achieving the above-mentioned object,

[0013] The gas turbine includes a compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, and a turbine capable of being driven by the combustion gas. The gas turbine output corrector includes: a correction coefficient generator that generates a correction coefficient for use in correcting the control output of the gas turbine; an output corrector that corrects the control output using the correction coefficient and outputs the corrected control output as a corrected control output; an output receiver that receives at least an output from an output meter that detects the output of the gas turbine; and an output storage unit that stores the output received by the output receiver. The correction coefficient generator includes: a first coefficient element calculator that calculates a first coefficient element; a second coefficient element calculator that calculates a second coefficient element; and a correction coefficient calculator that calculates the correction coefficient using the first and second coefficient elements. The output storage unit is capable of storing: a reference output, which is the output at a past reference time point under conditions where the gas turbine can output its maximum output; and a previous output received by the output receiver under conditions where the gas turbine can output its maximum output in a time period immediately before the reference time point. The first coefficient element is a ratio of an immediately previous output stored in the output storage unit to the reference output stored in the output storage unit. The second coefficient element is a ratio of a current output received by the output receiving unit to the immediately previous output stored in the output storage unit, under the condition that the gas turbine can output a maximum output, in a current time period from the immediately previous time period to the present.

[0014] In this method, a correction coefficient is calculated using a first coefficient element and a second coefficient element. This correction coefficient represents the degree of output degradation associated with gas turbine performance degradation. Furthermore, the first coefficient element and the second coefficient element also represent the degree of output degradation associated with gas turbine performance degradation. However, the first coefficient element and the second coefficient element represent the degree of output degradation in different time periods. Specifically, the first coefficient element represents the output degradation from the reference time point through the immediately preceding time period, while the second coefficient element represents the output degradation from the immediately preceding time period through the current time period. Thus, in this method, a correction coefficient is calculated using multiple different coefficient elements, and the control output is corrected using these correction coefficients.

[0015] Therefore, in this embodiment, it is possible to obtain a correction control output that appropriately reflects the degree of output degradation.

[0016] A gas turbine control device as one embodiment for achieving the object includes:

[0017] As an output corrector of the one embodiment; an instruction value generating unit, which uses the corrected control output obtained by the output corrector to generate an instruction value for the control object of the gas turbine; and a control signal output unit, which outputs a control signal representing the instruction value to the control object.

[0018] As described above, the output corrector of this embodiment can obtain a corrected control output that appropriately reflects the degree of output degradation. Therefore, by using this corrected control output to generate a command value for the controlled object and outputting a control signal representing this command value to the controlled object, it is possible to suppress the occurrence of poor control of the controlled object.

[0019] In a gas turbine output correction method as one embodiment for achieving the above-mentioned object,

[0020] The gas turbine includes a compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, and a turbine capable of being driven by the combustion gas. The gas turbine output correction method comprises the following steps: a correction coefficient creation step for creating a correction coefficient for use in correcting the control output of the gas turbine; an output correction step for correcting the control output using the correction coefficient and outputting the corrected control output as a corrected control output; an output reception step for receiving at least an output from an output meter that detects the output of the gas turbine; and an output storage step for storing the output received in the output reception step. The correction coefficient creation step includes a first coefficient element calculation step for calculating a first coefficient element; a second coefficient element calculation step for calculating a second coefficient element; and a correction coefficient calculation step for calculating the correction coefficient using the first and second coefficient elements. The output storage step stores: a reference output, which is the output at a past reference time point under conditions where the gas turbine can output its maximum output; and an immediately previous output received in the output reception step under conditions where the gas turbine can output its maximum output in a time period immediately before the reference time point. The first coefficient element is a ratio of the immediately previous output stored in the output storage step to the reference output stored in the output storage step. The second coefficient element is a ratio of the current output received in the output receiving step to the immediately previous output stored in the output storage step, under the condition that the gas turbine can output a maximum output, in a current time period from the immediately previous time period to the present.

[0021] A gas turbine control method as one embodiment for achieving the above-mentioned object implements an output correction method as one embodiment, and also performs the following steps: a command value creation step of creating a command value for a control object of the gas turbine using the corrected control output obtained by the output correction method; and a control signal output step of outputting a control signal representing the command value to the control object.

[0022] In a gas turbine output correction program as one embodiment for achieving the above-mentioned object,

[0023] The gas turbine includes a compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, and a turbine capable of being driven by the combustion gas. The gas turbine output correction program causes a computer to execute the following steps: a correction coefficient creation step of creating a correction coefficient used when correcting a control output of the gas turbine; an output correction step of correcting the control output using the correction coefficient and outputting the corrected control output as a corrected control output; an output receiving step of receiving at least an output from an output instrument that detects the output of the gas turbine; and an output storage step of storing the output received in the output receiving step in a storage device of the computer. The correction coefficient creation step includes: a first coefficient element calculation step of calculating a first coefficient element; a second coefficient element calculation step of calculating a second coefficient element; and a correction coefficient calculation step of calculating the correction coefficient using the first coefficient element and the second coefficient element. In the output storage step, the storage device stores: a reference output, which is the output at a past reference time point under the condition that the gas turbine can output its maximum output; and an immediately previous output received in the output receiving step under the condition that the gas turbine can output its maximum output in an immediately previous time period closer to the present time period than the reference time point. The first coefficient element is the ratio of the immediately previous output stored in the storage device in the output storage step to the reference output stored in the storage device in the output storage step. The second coefficient element is the ratio of the current output received in the output receiving step to the immediately previous output stored in the storage device in the output storage step under the condition that the gas turbine can output its maximum output in a current time period from the immediately previous time period to the present time period.

[0024] A control program for a gas turbine as one mode for achieving the above-mentioned object includes an output correction program as the first mode, and causes the computer to execute the following steps: a command value creation step of creating a command value for a control object of the gas turbine using the corrected control output obtained by executing the output correction program; and a control signal output step of outputting a control signal representing the command value to the control object.

[0025] Effects of the Invention

[0026] In one aspect of the present invention, it is possible to obtain a control output capable of suppressing the occurrence of a control failure of a controlled object associated with gas turbine performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a gas turbine plant in one embodiment according to the present invention.

[0028] Figure 2 It is a cross-sectional view of a burner in one embodiment according to the present invention.

[0029] Figure 3 It is a cross-sectional view of a main part of a burner in one embodiment according to the present invention.

[0030] Figure 4 This is a functional block diagram of a control device in one embodiment of the present invention.

[0031] Figure 5 This is a functional block diagram of a combustion load command generator in one embodiment of the present invention.

[0032] Figure 6 This is a functional block diagram of a fuel flow rate command generator in one embodiment of the present invention.

[0033] Figure 7 This is a functional block diagram of a flow ratio calculator in one embodiment of the present invention.

[0034] Figure 8 This is a functional block diagram of a valve command value generator in one embodiment of the present invention.

[0035] Figure 9 This is a functional block diagram of an output corrector in one embodiment of the present invention.

[0036] Figure 10 This is a graph for explaining the function F1 in one embodiment of the present invention.

[0037] Figure 11 This is a graph for explaining the function F2 in one embodiment of the present invention.

[0038] Figure 12 This is a graph for explaining the function F3 in one embodiment of the present invention.

[0039] Figure 13 This is a graph for explaining function F4 in one embodiment of the present invention.

[0040] Figure 14 This is a graph for explaining the function F5 in one embodiment of the present invention.

[0041] Figure 15 This is an explanatory diagram showing the hardware configuration of a control device in one embodiment of the present invention.

[0042] Figure 16 This is a flowchart showing an output reception routine in one embodiment of the present invention.

[0043] Figure 17 This is a flowchart showing a calibration routine in one embodiment of the present invention.

[0044] Figure 18 These are explanatory diagrams for explaining temporal changes in coefficient elements, correction coefficients, and correction control outputs in one embodiment of the present invention.

[0045] Figure 19 This is a flowchart showing the operation of the control device in one embodiment of the present invention. DETAILED DESCRIPTION

[0046] Hereinafter, one embodiment of an output corrector according to the present invention, a control device including the same, and a gas turbine plant including the control device will be described with reference to the drawings.

[0047] like Figure 1 As shown, the gas turbine equipment of the present embodiment includes a gas turbine 10 , a generator 29 that generates electric power by driving the gas turbine 10 , and a control device 100 that controls a control target in the gas turbine 10 .

[0048] The gas turbine 10 includes a compressor 11 that compresses air A, a combustor 31 that burns fuel F in the air compressed by the compressor 11 to generate combustion gas, and a turbine 21 driven by the high-temperature and high-pressure combustion gas.

[0049] The compressor 11 includes a compressor rotor 13 that rotates about an axis Ar, a compressor housing 12 that rotatably covers the compressor rotor 13, and an inlet guide vane (IGV) 14 provided at the intake port of the compressor housing 12. The IGV 14 includes a plurality of guide vanes 15 and a driver 16 that drives the guide vanes 15. The IGV 14 regulates the flow rate of air drawn into the compressor housing 12.

[0050] The turbine 21 includes a turbine rotor 23 that is rotated about an axis Ar by combustion gas from a combustor 31, and a turbine housing 22 that rotatably covers the turbine rotor 23. The turbine rotor 23 and the compressor rotor 13 are coupled to each other so as to be rotatable about the same axis Ar, forming a gas turbine rotor 28. The rotor of a generator 29 is connected to the gas turbine rotor 28.

[0051] The gas turbine 10 further includes an intermediate casing 24 and an exhaust casing 25. The intermediate casing 24 is disposed between the compressor casing 12 and the turbine casing 22 in the direction in which the axis Ar extends, and couples the compressor casing 12 and the turbine casing 22 together. Compressed air Ac discharged from the compressor 11 flows into the intermediate casing 24. The exhaust casing 25 is disposed on the side opposite to the side where the intermediate casing 24 is disposed, relative to the turbine casing 22. Combustion gas discharged from the turbine 21, i.e., exhaust gas, flows into the exhaust casing 25.

[0052] The burner 31 is fixed to the intermediate casing 24. Figure 2 As shown, the combustor 31 includes an outer tube 32 fixed to the center casing 24, a combustion tube (or tail tube) 33 arranged in the center casing 24 and conveying the combustion gas to the combustion gas flow path of the turbine 21, and a fuel injector 41 that injects fuel and air into the combustion tube 33.

[0053] like Figure 2 and Figure 3 As shown, the fuel injector 41 includes an inner tube 42, a pilot burner 43 arranged on the central axis Ak of ​​the inner tube 42, a plurality of main burners 53 arranged at equal intervals in the circumferential direction around the pilot burner 43, and a top hat nozzle 51 arranged on the outer circumference of the inner tube 42 on the inner circumference of the outer tube 32. Hereinafter, in the direction in which the central axis Ak of ​​the inner tube 42 extends, the side where the combustion gas G flows within the combustion tube 33 is referred to as the downstream side, and the opposite side is referred to as the upstream side.

[0054] The pilot combustor 43 includes a pilot nozzle 44 positioned on the central axis Ak of ​​the inner cylinder 42, and a cylindrical pilot air cylinder 45 surrounding the outer circumference of the pilot nozzle 44. A pilot cone 46 is formed on the downstream side of the pilot air cylinder 45, the diameter of which gradually increases as it approaches the downstream side. A pilot air flow path 48 is formed on the inner circumference of the pilot air cylinder 45, through which compressed air Ac from the compressor 11 flows as pilot air Ap. The pilot fuel Fp injected from the pilot nozzle 44 combusts (diffusion combustion) in the pilot air Ap ejected from the pilot air flow path 48, forming a diffusion flame 49.

[0055] The main combustor 53 includes a cylindrical main air inner cylinder 55 surrounding the outer circumference of the pilot air cylinder 45, a cylindrical main air outer cylinder 56 surrounding the outer circumference of the main air inner cylinder 55, baffles 57 circumferentially dividing the annular space between the outer circumference of the main air inner cylinder 55 and the inner circumference of the main air outer cylinder 56 into multiple sections, and main nozzles 54 disposed between the baffles 57. The multiple spaces defined by the main air inner cylinder 55, the main air outer cylinder 56, and the baffles 57 form a main air flow path 58, through which compressed air Ac from the compressor 11 flows as main air Am. The main nozzle 54 disposed within this main air flow path 58 injects main fuel Fm into the main air Am flowing through this main air flow path 58. Consequently, a premixed gas consisting of the main air Am and the main fuel Fm flows downstream of the tip (downstream end) of the main nozzle 54 within the main air flow path 58. When the premixed gas flows out from the main air flow path 58 , it burns (premixed combustion) to form a premixed flame 59 . The diffusion flame 49 described above plays a role in maintaining the premixed flame 59 .

[0056] The spaces on the inner circumference of the outer cylinder 32 and the outer circumference of the inner cylinder 42 form a compressed air flow path 52 that guides compressed air Ac from the compressor 11 into the inner cylinder 42. The top hat nozzle 51 injects top hat fuel Ft into this compressed air flow path 52. Therefore, when the top hat fuel Ft is injected into the compressed air flow path 52, it mixes with the main air Am and the pilot air Ap.

[0057] like Figure 1 and Figure 2 As shown, the gas turbine equipment of this embodiment also includes a pilot fuel pipeline 61 for supplying pilot fuel Fp to the pilot nozzle 44, a main fuel pipeline 62 for supplying main fuel Fm to the main nozzle 54, a top hat fuel pipeline 63 for supplying top hat fuel Ft to the top hat nozzle 51, a pilot fuel valve 65 for adjusting the flow rate of the pilot fuel Fp, a main fuel valve 66 for adjusting the flow rate of the main fuel Fm, and a top hat fuel valve 67 for adjusting the flow rate of the top hat fuel Ft.

[0058] The pilot fuel line 61, the main fuel line 62, and the top hat fuel line 63 are all branches from the fuel line 60. The pilot fuel valve 65 is provided in the pilot fuel line 61, the main fuel valve 66 is provided in the main fuel line 62, and the top hat fuel valve 67 is provided in the top hat fuel line 63.

[0059] The control targets of the gas turbine 10 in the present embodiment are the pilot fuel valve 65 , the main fuel valve 66 , the top hat fuel valve 67 , and the IGV 14 .

[0060] like Figure 1As shown, the gas turbine equipment of this embodiment further includes a tachometer 71 for detecting the rotation speed N of the gas turbine rotor 28, an output meter 72 for detecting the output PW of the generator 29, an intake air thermometer 73 for detecting the temperature of the air A sucked into the compressor 11, that is, the intake air temperature Ti, an intake air pressure gauge 74 for detecting the pressure of the air sucked into the compressor 11, that is, the intake air pressure (atmospheric pressure) Pi, a blade passage temperature meter 75 for detecting the temperature of the combustion gas immediately after the final stage of the turbine 21, that is, the blade passage temperature Tb, and an exhaust gas thermometer 76 for detecting the temperature Te of the exhaust gas in the exhaust casing 25 on the downstream side of the final stage of the turbine 21.

[0061] like Figure 4 As shown, the control device 100 includes a command value generating unit 110 for generating a command value for a control target of the gas turbine 10, a control signal output unit 190 for outputting a control signal representing the command value to the control target, a limited output generating unit 170 for generating a limited output of the gas turbine 10 corresponding to the intake air temperature Ti, and an output corrector 180 for correcting the control output of the gas turbine 10.

[0062] The command value generating unit 110 includes a combustion load command generator 120 for generating a combustion load command value CLCSO, a fuel flow rate command generator 130 for generating a fuel flow rate command value CSO, a flow rate ratio calculator 140 for calculating the fuel flow rate ratio (PLr, THr), a valve command value generator 150 for generating valve command values ​​for each of the fuel valves 65, 66, and 67, and an IGV command value generator 160 for generating an IGV command value indicating the opening degree of the IGV.

[0063] The combustion load command value CLCSO is a dimensionless parameter representing the temperature of the combustion gas at the inlet of the turbine 21 (hereinafter referred to as the inlet temperature). It is positively correlated with the inlet temperature. The combustion load command value CLCSO is set to 0% when the inlet temperature is at its lower limit and to 100% when the inlet temperature is at its upper limit. For example, when the lower limit of the inlet temperature is 700°C and the upper limit of the inlet temperature is 1500°C, the combustion load command value CLCSO is expressed by the following equation.

[0064] CLCSO (%) = {(measured value of gas turbine output - 700℃ MW)

[0065] / (1500℃MW-700℃MW)}×100

[0066] Note that 700°C MW is the gas turbine output when the inlet temperature is at the lower limit of 700°C, and 1500°C MW is the gas turbine output when the inlet temperature is at the upper limit of 1500°C. The gas turbine output here refers to the generator output.

[0067] like Figure 5 As shown, the combustion load instruction generator 120 has a 700°C MW operator 121a, a 1500°C MW operator 121b, a standard atmospheric pressure generator 122, a first divider 123, a first multiplier 124a, a second multiplier 124b, a first subtractor 125a, a second subtractor 125b, a second divider 126 and a limiter 127.

[0068] The 700°C MW calculator 121a uses the intake air temperature Ti and the IGV command value IGVc as variable parameters and uses function H1 to calculate the gas turbine output 700°C MW when the inlet and outlet temperature is 700°C. Furthermore, the 1500°C MW calculator 121b uses the intake air temperature Ti and the IGV command value IGVc as variable parameters and uses function H2 to calculate the gas turbine output 1500°C MW when the inlet and outlet temperature is 1500°C. The IGV command value IGVc is the command value given by the control device 100 to the driver 16 of the IGV 14. These MW calculators 121a and 121b modify the known values ​​of 700°C MW and 1500°C MW when the intake air temperature and IGV command value IGVc are at reference values ​​to values ​​corresponding to the actual intake air temperature Ti and IGV command value IGVc, and output the modified values ​​as 700°C MW and 1500°C MW.

[0069] Both 700°C MW and 1500°C MW are types of control outputs for the gas turbine 10. The 700°C MW is corrected to a corrected 700°C MWm by the output corrector 180. Furthermore, the 1500°C MW is corrected to a corrected 1500°C MWm by the output corrector 180. Both the corrected 700°C MWm and the corrected 1500°C MWm are types of corrected control outputs for the gas turbine 10.

[0070] The corrected 700°C MWm and corrected 1500°C MWm from the output corrector 180 are corrected based on the measured intake pressure (atmospheric pressure) Pi. Specifically, the first divider 123 calculates the intake pressure ratio Pr, which is the ratio of the intake pressure (atmospheric pressure) Pi detected by the intake pressure gauge 74 to the standard intake pressure (standard atmospheric pressure) Ps from the standard atmospheric pressure generator 122. The first multiplier 124a multiplies the corrected 700°C MWm from the output corrector 180 by the intake pressure ratio Pr to correct the corrected 700°C MWm to a value corresponding to the intake pressure ratio Pr. The second multiplier 124b multiplies the corrected 1500°C MWm from the output corrector 180 by the intake pressure ratio Pr to correct the corrected 1500°C MWm to a value corresponding to the intake pressure ratio Pr. That is, in the above, the known values ​​of 700°C MW and 1500°C MW when the intake air temperature and IGV command value IGVc are reference values ​​are corrected to values ​​corresponding to the measured intake air temperature Ti, IGV command value IGVc and measured intake pressure ratio Pr.

[0071] The first subtractor 125a subtracts the corrected 700°C MWm, which is corrected for the intake air pressure ratio Pr, from the measured output PW of the gas turbine 10 detected by the output meter 72. Specifically, the first subtractor 125a calculates the numerator of the above equation. The second subtractor 125b subtracts the corrected 700°C MWm, which is corrected for the intake air pressure ratio Pr, from the corrected 1500°C MWm, which is corrected for the intake air pressure ratio Pr.

[0072] That is, the second subtractor 125b obtains the value of the denominator of the above equation.

[0073] Second divider 126 divides the numerator of the above equation, calculated by first subtractor 125a, by the denominator of the above equation, calculated by second subtractor 125b, and outputs the resulting value as the combustion load command value. Limiter 127 limits the rate of increase or decrease of the combustion load command value outputted from second divider 126 so that the rate of increase or decrease, i.e., the amount of change per unit time, is below a predetermined value.

[0074] In addition, in the above, the lower limit value of the inlet temperature of the combustion gas in the turbine 21 is set to 700°C and the upper limit value is set to 1500°C, but depending on the model of the burner 31, the lower limit value and the upper limit value of the inlet temperature of the combustion gas in the turbine 21 can be set to values ​​different from the above example.

[0075] The combustion load command value CLCSO is outputted from the combustion load command generator 120 , the increase / decrease rate of which is limited by the limiter 127 .

[0076] The fuel flow rate command value CSO is a value indicating the total flow rate of fuel supplied to the burner 31 (hereinafter referred to as the total fuel flow rate). Therefore, the fuel flow rate command generator 130 calculates the total fuel flow rate. Figure 6 As shown, the fuel flow command generator 130 includes a governor controller 131 , a load controller 132 , a blade passage temperature controller 133 , an exhaust temperature controller 134 , a low value selector 135 and a limiter 136 .

[0077] The governor controller 131 receives the rotational speed N of the gas turbine rotor 28 from the tachometer 71. The governor controller 131 then outputs a command value GVCSO for controlling the total fuel flow rate so that the rotational speed N of the gas turbine rotor 28 matches the target rotational speed. Specifically, the governor controller 131 compares the measured rotational speed N of the gas turbine rotor 28 with a preset GV set value and outputs a proportional control signal as the command value GVCSO.

[0078] The load controller 132 receives the measured output PW of the gas turbine 10 and the requested output PWr of the gas turbine 10 from the host control device from the output meter 72. The load controller 132 then outputs a command value LDCSO for controlling the total fuel flow rate so that the measured output PW matches the requested output PWr. Specifically, the load controller 132 compares the measured output PW with the requested output PWr, performs a proportional-integral operation on the comparison, and outputs the result as the command value LDCSO.

[0079] The blade duct temperature controller 133 receives the blade duct temperature Tb from the blade duct thermometer 75. The blade duct temperature controller 133 then outputs a command value BPCSO for controlling the total fuel flow rate so that the blade duct temperature Tb does not exceed an upper limit. Specifically, the blade duct temperature controller 133 compares the measured blade duct temperature Tb with its upper limit, performs a proportional-integral operation, and outputs the result as the command value BPCSO.

[0080] The exhaust temperature controller 134 receives the exhaust temperature Te from the exhaust temperature meter 76. The exhaust temperature controller 134 then outputs a command value EXCSO for controlling the total fuel flow rate so that the exhaust temperature Te does not exceed an upper limit. Specifically, the exhaust temperature controller 134 compares the measured exhaust temperature Te with its upper limit, performs a proportional-integral operation, and outputs the result as the command value EXCSO.

[0081] The low value selector 135 selects the minimum command value from the command values ​​from the controllers 131 to 134 and outputs it. The limiter 136 limits the rate of increase or decrease of the command from the low value selector 135 and outputs it as the fuel flow rate command value (total fuel flow rate command value) CSO.

[0082] The flow ratio calculator 140 calculates the pilot ratio PLr, which is the ratio of the pilot fuel flow rate Fpf to the total fuel flow rate, and the top hat ratio THr, which is the ratio of the top hat fuel flow rate Ftf to the total fuel flow rate. Figure 7 As shown, the flow ratio calculator 140 includes a pilot ratio calculator 141 and a top hat ratio calculator 142 .

[0083] The pilot ratio calculator 141 includes a function F1 that defines the relationship between the combustion load command value CLCSO, which is positively correlated with the inlet temperature of the combustion gas in the turbine 21, and the pilot ratio PLr. Figure 10 As shown, function F1 is a function that gradually decreases the pilot ratio PLr as the combustion load command value CLCSO increases, that is, as the inlet temperature of the combustion gas rises. The pilot ratio calculator 141 receives the combustion load command value CLCSO from the combustion load command generator 120. Then, using function F1, pilot ratio calculator 141 calculates the pilot ratio PLr corresponding to the combustion load command value CLCSO. While function F1 is used here to define the relationship between the combustion load command value CLCSO and the pilot ratio PLr, this relationship may alternatively be defined using a map.

[0084] The top hat ratio calculator 142 includes a function F2 that defines the relationship between the combustion load command value CLCSO, which is positively correlated with the inlet temperature of the combustion gas in the turbine 21, and the top hat ratio THr. Figure 11 As shown, function F2 is a function that gradually increases the top-hat ratio THr as the combustion load command value CLCSO increases, that is, as the inlet temperature of the combustion gas rises. The top-hat ratio calculator 142 receives the combustion load command value CLCSO from the combustion load command generator 120. Then, using function F2, the top-hat ratio calculator 142 calculates the top-hat ratio THr corresponding to the combustion load command value CLCSO. While function F2 is used here to define the relationship between the combustion load command value CLCSO and the top-hat ratio THr, this relationship may alternatively be defined using a map.

[0085] like Figure 8 As shown, the valve command value generator 150 includes a first multiplier 151 , a second multiplier 152 , a first subtractor 153 , a second subtractor 154 , a PL valve command value calculator 155 , an M valve command value calculator 157 , and a TH valve command value calculator 156 .

[0086] A first multiplier 151 multiplies a fuel flow rate command value CSO representing the total fuel flow rate by a pilot ratio PLr to obtain a pilot fuel flow rate Fpf. A PL valve command value calculator 155 obtains a command value for the pilot fuel valve 65 so that the flow rate of the pilot fuel Fp injected from the pilot nozzle 44 is equal to the pilot fuel flow rate Fpf.

[0087] The second multiplier 152 multiplies the fuel flow rate command value CSO representing the total fuel flow rate by the top hat ratio THr to obtain the top hat fuel flow rate Ftf. The TH valve command value calculator 156 obtains the command value for the top hat fuel valve 67 so that the flow rate of the top hat fuel Ft injected from the top hat nozzle 51 becomes the top hat fuel flow rate Ftf.

[0088] A first subtractor 153 subtracts the top hat fuel flow rate Ftf from the fuel flow rate command value CSO representing the total fuel flow rate. A second subtractor 154 further subtracts the pilot fuel flow rate Fpf from the subtraction result of the first subtractor 153 and outputs the subtraction result as the main fuel flow rate Fmf to the M-valve command value calculator 157. The M-valve command value calculator 157 calculates the command value for the main fuel valve 66 so that the total flow rate of the main fuel Fm ejected from the plurality of main nozzles 54 equals the main fuel flow rate Fmf.

[0089] The control signal output unit 190 outputs a control signal including the command value obtained by the PL valve command value calculator 155 to the pilot fuel valve 65. The control signal output unit 190 outputs a control signal including the command value obtained by the TH valve command value calculator 156 to the top hat fuel valve 67. The control signal output unit 190 outputs a control signal including the command value obtained by the M valve command value calculator 157 to the main fuel valve 66.

[0090] like Figure 1 As shown in FIG. 1 , the intake air temperature Ti from the intake air temperature meter 73 is input to the output limit generator 170. The output limit generator 170 has a function F4 representing the relationship between the output limit of the gas turbine 10 and the intake air temperature Ti. Figure 13 As shown, the function F4 is a function in which the limited output LDx gradually decreases as the intake air temperature Ti increases. The limited output generator 170 uses the function F4 to determine the limited output LDx corresponding to the intake air temperature Ti.

[0091] The limited output LDx is one type of control output of the gas turbine 10. The limited output LDx is corrected to a corrected limited output LDxm by the output corrector 180. The corrected limited output LDxm is one type of corrected control output of the gas turbine 10.

[0092] like Figure 4As shown, the output corrector 180 corrects the measured output PW of the gas turbine 10 from the output meter 72 and outputs the corrected output PWm. The measured output PW is a type of control output of the gas turbine 10. Furthermore, the corrected output PWm is a type of corrected control output of the gas turbine 10.

[0093] The IGV command value generator 160 receives the intake air temperature Ti from the intake air thermometer 73 and the corrected output PWm from the output corrector 180. The IGV command value generator 160 includes a function F3 representing the relationship between the output of the gas turbine 10 and the IGV opening. Figure 12 As shown, function F3 gradually increases the IGV opening as the output of the gas turbine 10 increases. First, the IGV command value generator 160 corrects the corrected output PWm using the intake air temperature Ti. Next, the IGV command value generator 160 uses function F3 to determine the IGV opening corresponding to the corrected output PWm corrected using the intake air temperature Ti. While function F3 is used here to define the relationship between the output of the gas turbine 10 and the IGV opening, this relationship could alternatively be defined using a graph.

[0094] The IGV command value generator 160 outputs the IGV command value IGVc, indicating the IGV opening, to the combustion load command generator 120 and the control signal output unit 190. As previously described, the combustion load command generator 120 uses the IGV command value IGVc to generate the combustion load command value CLCSO. Furthermore, the control signal output unit 190 outputs a control signal including the IGV command value IGVc output by the IGV command value generator 160 to the IGV 14.

[0095] Basically, the function F3 is incorporated into the control device 100 during initial setting. The function F3 incorporated during the initial setting is a function set when the gas turbine 10 is designed. After the gas turbine 10 is built, a test run of the gas turbine 10 is performed. The function F3 incorporated during the initial setting is calculated based on the results of the test run, for example, Figure 12 The method shown by the dotted line is often changed.

[0096] like Figure 9 As shown, output corrector 180 corrects the control output and outputs it as a corrected control output. In this embodiment, as described above, the control outputs include the gas turbine output 700°C MW, the gas turbine output 1500°C MW, the measured output PW, and the limited output LDx. Therefore, in this embodiment, the corrected control outputs include the corrected 700°C MWm, the corrected 1500°C MWm, the corrected output PWm, and the corrected limited output LDxm.

[0097] The output corrector 180 includes an output receiving unit 181 , an output storage unit 182 , a correction coefficient generating unit 183 , and an output correcting unit 188 .

[0098] The output receiving unit 181 receives a reference output PWb, an immediately preceding output PW1, and a current output PW2. The reference output PWb is the output at a past reference time point under conditions where the gas turbine 10 could output its maximum output. This reference time point is, for example, the design time point of the gas turbine 10. When the reference output PWb is the design time point of the gas turbine 10, the output receiving unit 181 receives the reference output PWb from an input device 104, such as a keyboard. The immediately preceding output PW1 is the measured output received by the output receiving unit 181 from the output meter 72 during a period immediately preceding the reference time point (design time point) and under conditions where the gas turbine 10 could output its maximum output. The immediately preceding time period includes a period during trial operation (testing the gas turbine 10) and a period during full operation (following the trial operation). Therefore, the immediately preceding time period includes a period during construction and trial operation (testing after the gas turbine 10 is built), excluding test operations after overhaul or repair of the gas turbine 10. Therefore, the immediately previous output includes the time period during the construction test operation. Under conditions where the gas turbine 10 can output its maximum output, the output received by the output receiving unit 181 from the output meter 72 is the construction output PWc. The current output PW2 is the actual output received by the output receiving unit 181 from the output meter 72 during the current time period from the immediately previous time period to the present time, under conditions where the gas turbine 10 can output its maximum output. The current time period also includes the time period during the test operation, during which the gas turbine 10 is being tested, and the time period during the main operation, during which the main operation is being carried out after the test operation.

[0099] The output receiving unit 181 cannot identify whether the measured output is the immediately preceding output PW1, the current output PW2, or the construction output PWc simply by receiving the measured output from the output device 72 at each time period described above. Therefore, the output receiving unit 181 receives the measured output from the output device 72 and also receives information about the time period of the measured output from the input device 104, such as a keyboard.

[0100] The output storage unit 182 stores the reference output PWb, the immediately previous output PW1, the current output PW2, and the construction output PWc received by the output receiving unit 181.

[0101] The correction coefficient generating unit 183 includes a first coefficient element calculating unit 184 a , a second coefficient element calculating unit 184 b , a third coefficient element calculating unit 184 c , a coefficient element storing unit 185 , a resetting unit 186 , and a correction coefficient calculating unit 187 .

[0102] The first coefficient element calculation unit 184a calculates the first coefficient element e1. This first coefficient element e1 is the value obtained by dividing the immediately preceding output PW1 stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182, that is, the ratio of the immediately preceding output PW1 to the reference output PWb (PW1 / PWb). Therefore, this first coefficient element e1 represents the degree of output degradation from the reference time point to the immediately preceding time period.

[0103] Upon receiving a reset instruction from the input device 104, such as a keyboard, the first coefficient element calculator 184a sets the value obtained by dividing the current output PW2 stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182, that is, the ratio of the current output PW2 to the reference output PWb (PW2 / PWb), as the first coefficient element e1. The reset instruction is sent to the first coefficient element calculator 184a immediately before the start of a test run after the gas turbine 10 has been completely stopped.

[0104] The second coefficient element calculation unit 184b calculates the second coefficient element e2. This second coefficient element e2 is the value obtained by dividing the current output PW2 stored in the output storage unit 182 by the immediately preceding output PW1 stored in the output storage unit 182, that is, the ratio of the current output PW2 to the immediately preceding output PW1 (PW2 / PW1). Therefore, this second coefficient element e2 represents the degree of output degradation from the immediately preceding time period to the period immediately preceding the current time period.

[0105] The third coefficient element calculation unit 184c calculates the third coefficient element e3. This third coefficient element e3 is the value obtained by dividing the construction output PWc stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182, that is, the ratio of the construction output PWc to the reference output PWb (PWc / PWb). Therefore, this third coefficient element e3 represents the degree of output degradation during the period from the reference time point to the time period during the construction trial operation.

[0106] The coefficient element storage unit 185 includes a first coefficient element storage unit 185a that stores the first coefficient element e1, a second coefficient element storage unit 185b that stores the second coefficient element e2, and a third coefficient element storage unit 185c that stores the third coefficient element e3.

[0107] During the period from the complete stop of the gas turbine 10 to the start of the test run, the reset instruction described above is input to the reset unit 186 from the input device 104, such as a keyboard. Receiving the reset instruction, the reset unit 186 resets the second coefficient element e2 stored in the second coefficient element storage unit 185b to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculation unit 187, in this case, to "1."

[0108] Correction coefficient calculation unit 187 includes a first correction coefficient calculation unit 187a for calculating a first correction coefficient K1, and a second correction coefficient calculation unit 187b for calculating a second correction coefficient K2. The first correction coefficient K1 is used to correct the limited output LDx, which is one type of control output, and further corrects the 1500°C MW and 700°C MW, which are one type of control output. The second correction coefficient K2 is used to correct the measured output PW, which is one type of control output.

[0109] The first correction coefficient calculation unit 187a includes a multiplier 187t that multiplies the first coefficient element e1 stored in the first coefficient element storage unit 185a by the second coefficient element e2 stored in the second coefficient element storage unit 185b and outputs the multiplication result as the first correction coefficient K1.

[0110] The second correction coefficient calculation unit 187b has a divider 187s, a multiplier 187t, and a correction coefficient adjuster 187u. The divider 187s divides the first coefficient element e1 stored in the first coefficient element storage unit 185a by the third coefficient element e3 stored in the third coefficient element storage unit 185c. The multiplier 187t multiplies the value based on the division result of the divider 187s by the second coefficient element e2 stored in the second coefficient element storage unit 185b. The value based on the multiplication result of the multiplier 187t becomes the second correction coefficient K2o before adjustment. The correction coefficient adjuster 187u has a function F5 that represents the relationship between the second correction coefficient K2o before adjustment and the second correction coefficient K2 after adjustment. Figure 14 As shown in FIG. 1 , function F5 is a function in which the adjusted second correction coefficient K2 increases as the pre-adjustment second correction coefficient K2o increases. Correction coefficient adjuster 187u uses function F5 to determine the adjusted second correction coefficient K2 corresponding to the pre-adjustment second correction coefficient K2o. While function F5 is used here to define the relationship between the pre-adjustment second correction coefficient K2o and the adjusted second correction coefficient K2, this relationship may also be defined using a graph.

[0111] The second correction coefficient calculation unit 187b obtains the second correction coefficient K2o before adjustment by calculation represented by the following equation.

[0112] K2o=e1÷e3×e2

[0113] =(PW1 / PWb)÷(PWc / PWb)×(PW2 / PW1)

[0114] In the calculations in the above equation, the reference output PWb used in the calculation of the first coefficient element e1 and the reference output PWb used in the calculation of the third coefficient element e3 cancel each other out. Therefore, the second correction coefficients K2o and K2 become elements that negate the reference output PWb at the design time point and instead represent the degree of output degradation prior to the current time period, using the actual output measured during the construction trial operation, namely, the construction output PWc, as a reference.

[0115] As mentioned above, the second correction coefficient K2 is used to correct the measured output PW to obtain the corrected output PWm. And, the IGV command value generator 160 uses the function F3 to obtain the IGV opening corresponding to the corrected output PWm. Figure 12 As explained above, function F3 often changes during the construction trial run. Therefore, the second correction coefficient K2 used to obtain the IGV opening is set to a value that represents the degree of output degradation before the current time period based on the actual output during the construction trial run, that is, the construction output PWc.

[0116] The control output is input not only to the output corrector 188 but also to the correction coefficient calculator 187. Based on the control output, the correction coefficient calculator 187 outputs a correction coefficient corresponding to the control output, one of the first correction coefficient K1 and the second correction coefficient K2, to the output corrector 188.

[0117] The output correction unit 188 includes a first output correction unit 188a for correcting the limit output LDx using the first correction coefficient K1, a second output correction unit 188b for correcting 1500°C MW and 700°C MW using the first correction coefficient K1, and a third output correction unit 188c for correcting the measured output PW using the second correction coefficient K2.

[0118] The first output correction unit 188a includes a multiplier 188t, an adder 188u, a low value selector 188v, a first storage unit 188x storing an output of the amplitude of the frequency in the system electrically connected to the generator 29, i.e., an amplitude output FF, and a second storage unit 188y storing the maximum allowable output PWpmax of the generator 29. The multiplier 188t multiplies the limit output LDx, which is one of the control outputs, by the first correction coefficient K1. The adder 188u adds the value based on the multiplication result of the multiplier 188t to the amplitude output FF stored in the first storage unit 188x. The low value selector 188v outputs the smaller of the value based on the addition result of the adder 188u and the maximum allowable output PWpmax stored in the second storage unit 188y as the corrected limit output LDxm. In addition, as Figure 13As shown, the maximum allowable output PWpmax is a value that remains constant even if the intake air temperature Ti changes. Furthermore, within a temperature range where the intake air temperature Ti is low, the maximum allowable output PWpmax is smaller than the maximum control output PWx within that low temperature range, but within other temperature ranges, the maximum allowable output PWpmax is larger than the maximum control output PWx within that other temperature range.

[0119] The second output corrector 188b includes a multiplier 188t which multiplies 1500°C MW and 700°C MW, which are one type of control output, by a first correction coefficient K1 to correct 1500°C MW and 700°C MW and outputs the correction results as corrected 1500°C MWm and corrected 700°C MWm.

[0120] The third output correction unit 188c includes a divider 188s. The divider 188s divides the actual measurement output PW, which is one of the control outputs, by the second correction coefficient K2 to correct the actual measurement output PW and outputs the correction result as a modified output PWm.

[0121] The control device 100 described above is a computer. Figure 15 As shown, in terms of hardware, the control device 100 includes a CPU (Central Processing Unit) 101 for performing various calculations; a main storage device 102 such as a memory that serves as a work area for the CPU 101; an auxiliary storage device 103 such as a hard disk drive device; an input device 104 such as a keyboard and a mouse; a display device 105; an input / output interface 106 for the input device 104 and the display device 105; a device interface 107; a communication interface 108 for communicating with the outside via a network N; and a storage / playback device 109 for performing storage processing and playback processing on a disk-type storage medium D.

[0122] The device interface 107 is connected to the detectors 71 to 76 , the fuel valves 65 to 67 , and the IGV 14 described above via signal lines and the like.

[0123] A control program 103p and the like are pre-stored in the auxiliary storage device 103. The control program 103p includes an output correction program 103pa. The control program 103p is read from a disk-type storage medium D into the auxiliary storage device 103 via, for example, the storage / playback device 109. Alternatively, the control program 103p is read from an external device into the auxiliary storage device 103 via the communication interface 108.

[0124] use Figures 4 to 9Each functional element of the control device 100 described below functions when the CPU 101 executes a control program 103p stored in the auxiliary storage device 103. In particular, the output corrector 180, among the functional elements of the control device 100, functions when the CPU 101 executes an output correction program 103pa stored in the control program 103p in the auxiliary storage device 103. Furthermore, each storage unit of the control device 100 is composed of at least one storage device from the main storage device 102 and the auxiliary storage device 103.

[0125] Then, follow Figure 16 and Figure 17 The flowchart shown here explains the operation procedure of the output corrector 180 described above.

[0126] Figure 16 The flowchart shown is a flowchart for the output reception routine. In the output reception routine, the output reception unit 181 receives an output from the input device 104, such as a keyboard, or the output instrument 72 (output reception step S11). The output storage unit 182 stores this output (output storage step S12). In the output reception routine, by repeatedly executing the output reception step S11 and the output storage step S12, the reference output PWb, the construction output PWc, the immediately previous output PW1 (excluding the construction output PWc), and the current output PW2 are stored in the output storage unit 182. Once the reference output PWb and the construction output PWc are stored in the output storage unit 182, they are not subsequently updated. On the other hand, even if the immediately previous output PW1 (excluding the construction output PWc) and the current output PW2 are stored in the output storage unit 182, they are updated sequentially.

[0127] Figure 17 The flowchart shown is a flowchart of the calibration routine. In this calibration routine, the calibration coefficient creation step S20 and the output calibration step S25 are repeatedly executed.

[0128] The correction coefficient preparation step S20 includes a first coefficient element calculation step S21 a , a second coefficient element calculation step S21 b , a third coefficient element calculation step S21 c , a coefficient element storage step S22 , a reset step S23 , and a correction coefficient calculation step S24 .

[0129] In the first coefficient element calculation step S21a, the first coefficient element calculation unit 184a divides the immediately preceding output PW1 stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182 to obtain the first coefficient element e1 (=PW1 / PWb). However, upon receiving a reset instruction from the input device 104, such as a keyboard, the first coefficient element calculation unit 184a divides the current output PW2 stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182 to obtain the first coefficient element e1 (=PW2 / PWb).

[0130] In the second coefficient element calculation step S21 b , the second coefficient element calculation unit 184 b divides the current output PW2 stored in the output storage unit 182 by the immediately previous output PW1 stored in the output storage unit 182 to obtain the second coefficient element e2 (= PW2 / PW1 ).

[0131] In the third coefficient element calculation step S21 c , the third coefficient element calculation unit 184 c divides the construction output PWc stored in the output storage unit 182 by the reference output PWb stored in the output storage unit 182 to obtain the third coefficient element e3 (=PWc / PWb).

[0132] The coefficient element calculation steps S21a, S21b, and S21c are not generally executed at the same timing. Each time the output used in the coefficient element calculation steps S21a, S21b, and S21c is stored in the output storage unit 182, the coefficient element calculation steps S21a, S21b, and S21c are executed.

[0133] The coefficient element storage step S22 includes a first coefficient element storage step S22a, a second coefficient element storage step S22b, and a third coefficient element storage step S22c.

[0134] In the first coefficient element storage step S22a, the first coefficient element storage unit 185a stores the first coefficient element e1 calculated in the first coefficient element calculation step S21a.

[0135] In the second coefficient element storage step S22b, the second coefficient element storage unit 185b stores the second coefficient element e2 calculated in the second coefficient element calculation step S21b.

[0136] In the third coefficient element storage step S22c, the third coefficient element storage unit 185c stores the third coefficient element e3 calculated in the third coefficient element calculation step S21c.

[0137] The reset step S23 includes a reception determination step S23a and a reset execution step S23b. In the reception determination step S23a, the reset unit 186 determines whether a reset instruction has been received from the input device 104, such as a keyboard. If the reset unit 186 determines that it has received the reset instruction, the reset execution step S23b is executed. In the reset execution step S23b, the reset unit 186 resets the second coefficient element e2 stored in the second coefficient element storage unit 185b to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculation unit 187, in this case, to "1." Furthermore, the first coefficient element calculation unit 184a receives the reset instruction at the same time as the reset unit 186 receives the reset instruction. As a result, as described above, the first coefficient element calculation unit 184a sets the value obtained by dividing the current output PW2 by the reference output PWb as the first coefficient element e1 (= PW2 / PWb). This first coefficient element e1 is stored in the first coefficient element storage unit 185a.

[0138] The correction coefficient calculation step S24 includes a first correction coefficient calculation step S24a and a second correction coefficient calculation step S24b.

[0139] In the first correction coefficient calculation step S24a, the first correction coefficient calculation unit 187a calculates the first correction coefficient K1. In the second correction coefficient calculation step S24b, the second correction coefficient calculation unit 187b calculates the second correction coefficient K2.

[0140] In the output correction step S25, the output correction unit 188 corrects the control output using the correction coefficient and outputs the correction result as the corrected control output. At this point, the output correction unit 188 corrects the control output using the correction coefficient corresponding to the control output to be corrected, among the multiple correction coefficients calculated by the correction coefficient calculation unit 187. Specifically, in the output correction step S25, as described above, the first output correction unit 188a of the output correction unit 188 corrects the limit output LDx using the first correction coefficient K1, the amplitude output FF stored in the first storage unit 188x, and the maximum allowable output PWpmax stored in the second storage unit 188y, and outputs the correction result as the corrected limit output LDxm. Furthermore, in the output correction step S25, as described above, the second output correction unit 188b of the output correction unit 188 corrects the 1500°C MW and 700°C MW using the first correction coefficient K1, respectively, and outputs the correction results as the corrected 1500°C MWm and corrected 700°C MWm. Then, in the output correction step S25 , the third output correction unit 188 c of the output correction unit 188 corrects the actual measurement output PW using the second correction coefficient K2 and outputs the correction result as the corrected output PWm.

[0141] Next, refer to Figure 18The following describes how each coefficient element, each correction coefficient, and each correction control output change over time.

[0142] Here, it is assumed that

[0143] The reference output PWb at the reference time point (planned time point) is set to 100 MW.

[0144] During the construction test operation, the construction output PWc, which is the actual output received by the output receiving unit 181 from the output meter 72 under the condition that the gas turbine 10 can output the maximum output, is set to 90 MW.

[0145] In the subsequent first regular operation, the measured output received by the output receiving unit 181 from the output meter 72 under the condition that the gas turbine 10 can output the maximum output is set to 80 MW.

[0146] In the subsequent second regular operation, the measured output received by the output receiving unit 181 from the output meter 72 under the condition that the gas turbine 10 can output the maximum output is set to 70 MW.

[0147] It is assumed that the gas turbine 10 has been subjected to regular maintenance after the second regular operation.

[0148] During the trial operation following this scheduled maintenance, the measured output received by the output receiving unit 181 from the output meter 72 was set to 80 MW, under conditions where the gas turbine 10 could output its maximum output. Therefore, as a result of the scheduled maintenance, the measured output (80 MW) was greater than the measured output (70 MW) during the second full operation prior to the scheduled maintenance.

[0149] In the subsequent first regular operation, the measured output received by the output receiving unit 181 from the output meter 72 under the condition that the gas turbine 10 can output the maximum output is set to 70 MW.

[0150] In the subsequent second main operation, the measured output received by the output receiving unit 181 from the output meter 72 under the condition that the gas turbine 10 can output the maximum output is set to 65 MW.

[0151] Before the construction trial run begins, the correction coefficient generator 183 receives a reset instruction. Therefore, during the construction trial run, the first coefficient element calculator 184a divides the current output PW2 by the reference output PWb to create the first coefficient element e1 (= PW2 / PWb). This results in the first coefficient element e1 being 9 / 10 (= 90 / 100), and is stored in the first coefficient element storage 185a. Furthermore, during the construction trial run, the reset unit 186 causes the second coefficient element storage 185b to store "1" as the second coefficient element e2. Furthermore, during the construction trial run, the third coefficient element calculator 184c divides the construction output PWc by the reference output PWb to create the third coefficient element e3 (= PWc / PWb). This results in the third coefficient element e3 being 9 / 10 (= 90 / 100), and is stored in the third coefficient element storage 185c.

[0152] The third coefficient element e3 stored in the third coefficient element storage unit 185c will not be updated thereafter.

[0153] As described above, the results of determining the various coefficient elements during the construction trial run allow the various correction coefficients during the construction trial run to be calculated. During the construction trial run, for example, the first correction coefficient K1 (e1 × e2) is 0.9 (= 9 / 10 × 1). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) is 1.0 (= 9 / 10 × 1 ÷ 9 / 10). For simplicity, the values ​​of this second correction coefficient K2 and those described below are assumed to be those without coefficient adjustment by correction coefficient adjuster 187u.

[0154] Therefore, during the construction trial run, if the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 90 MW (=100 × 0.9). Furthermore, if the measured output PW, one type of control output, is 90 MW, the corrected output PWm calculated using the second correction coefficient K2 is 90 MW (90 ÷ 1.0).

[0155] During the first full-scale operation following the construction trial operation, unlike during the construction trial operation, the first coefficient element calculation unit 184a sets the value obtained by dividing the immediately preceding output PW1 by the reference output PWb as the first coefficient element e1 (= PW2 / PWb). Consequently, the first coefficient element e1 becomes 9 / 10 (= 90 / 100), and this first coefficient element e1 is stored in the first coefficient element storage unit 185a. During this first full-scale operation, the second coefficient element calculation unit 184b sets the value obtained by dividing the current output PW2 by the immediately preceding output PW1 as the second coefficient element e2 (= PW2 / PW1). Consequently, the second coefficient element e2 becomes 8 / 9 (= 80 / 90), and this second coefficient element e2 is stored in the second coefficient element storage unit 185b. Furthermore, as previously mentioned, the third coefficient element e3 stored in the third coefficient element storage unit 185c remains unchanged from the construction trial operation to the first full-scale operation.

[0156] As described above, after determining the coefficient elements during the first official operation, the correction coefficients for the first official operation can be calculated. During the first official operation, the first correction coefficient K1 (e1 × e2) is 0.8 (= 9 / 10 × 8 / 9). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) is 0.89 (= 9 / 10 × 8 / 9 ÷ 9 / 10).

[0157] Therefore, in the first operation, if the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 80 MW (=100 × 0.8). Furthermore, if the measured output PW, one type of control output, is 80 MW, the corrected output PWm calculated using the second correction coefficient K2 is 90 MW (80 ÷ 0.89).

[0158] In the second main operation following this first main operation, the first coefficient element calculation unit 184a and the second coefficient element calculation unit 184b calculate the coefficient elements in the same manner as in the first main operation. As a result, the first coefficient element e1 (= PW2 / PWb) becomes 8 / 10 (= 80 / 100), and this first coefficient element e1 is stored in the first coefficient element storage unit 185a. Furthermore, the second coefficient element e2 (= PW2 / PW1) becomes 7 / 8 (= 70 / 80), and this second coefficient element e2 is stored in the second coefficient element storage unit 185b.

[0159] As described above, the results of determining the coefficient elements for the second official operation allow the correction coefficients for the second official operation to be determined. In the second official operation, the first correction coefficient K1 (e1 × e2) is 0.7 (= 8 / 10 × 7 / 8). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) is 0.78 (= 8 / 10 × 7 / 8 ÷ 9 / 10).

[0160] Therefore, in the second official operation, if the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 70 MW (= 100 × 0.7). Furthermore, if the measured output PW, one type of control output, is 70 MW, the corrected output PWm calculated using the second correction coefficient K2 is 90 MW (70 ÷ 0.78).

[0161] As mentioned above, after the second official operation is completed, regular maintenance is performed.

[0162] Before starting the trial run after periodic maintenance, the correction coefficient generation unit 183 receives a reset instruction. Therefore, during the trial run after periodic maintenance, the first coefficient element calculation unit 184a divides the current output PW2 by the reference output PWb to set the first coefficient element e1 (= PW2 / PWb). This results in the first coefficient element e1 being 8 / 10 (= 80 / 100), which is stored in the first coefficient element storage unit 185a. Furthermore, during this trial run, the reset unit 186 operates to store "1" in the second coefficient element storage unit 185b as the second coefficient element e2.

[0163] As described above, the results of determining the coefficient elements during the trial run allow the correction coefficients to be determined. During the trial run, the first correction coefficient K1 (e1 × e2) was 0.8 (= 80 / 10 × 1). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) was 0.89 (= 8 / 10 × 1 ÷ 9 / 10).

[0164] Therefore, during the test run, if the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 80 MW (=100 × 0.8). Furthermore, if the measured output PW, one type of control output, is 70 MW, the corrected output PWm calculated using the second correction coefficient K2 is 79 MW (70 ÷ 0.89).

[0165] During the first full-scale operation following the previous test run, unlike the previous test run, the first coefficient element calculation unit 184a sets the value obtained by dividing the immediately preceding output PW1 by the reference output PWb as the first coefficient element e1 (= PW2 / PWb). Consequently, the first coefficient element e1 becomes 8 / 10 (= 80 / 100), and this first coefficient element e1 is stored in the first coefficient element storage unit 185a. During this first full-scale operation, the second coefficient element calculation unit 184b sets the value obtained by dividing the current output PW2 by the immediately preceding output PW1 as the second coefficient element e2 (= PW2 / PW1). Consequently, the second coefficient element e2 becomes 7 / 8 (= 70 / 80), and this second coefficient element e2 is stored in the second coefficient element storage unit 185b.

[0166] As described above, the results of determining the coefficient elements in the first official operation allow the correction coefficients in the first official operation to be calculated. In the first official operation, the first correction coefficient K1 (e1 × e2) is 0.7 (= 8 / 10 × 7 / 8). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) is 0.78 (= 8 / 10 × 7 / 8 ÷ 9 / 10).

[0167] Therefore, in the first operation, if the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 70 MW (= 100 × 0.7). Furthermore, if the measured output PW, one type of control output, is 70 MW, the corrected output PWm calculated using the second correction coefficient K2 is 90 MW (70 ÷ 0.078).

[0168] In the second official operation following this first official operation, the first coefficient element calculation unit 184a and the second coefficient element calculation unit 184b calculated the coefficient elements in the same manner as in the first official operation. Therefore, the first coefficient element e1 (= PW2 / PWb) becomes 7 / 10 (= 70 / 100). Furthermore, the second coefficient element e2 (= PW2 / PW1) becomes 6.5 / 7 (= 65 / 70).

[0169] During the second official operation, the first correction coefficient K1 (e1 × e2) is 0.65 (= 7 / 10 × 65 / 70). Furthermore, the second correction coefficient K2 (e1 × e2 ÷ e3) is 0.72 (= 7 / 10 × 65 / 70 ÷ 9 / 10). Furthermore, when the 1500°C MW, one type of control output, is 100 MW, the corrected 1500°C MWm calculated using the first correction coefficient K1 is 65 MW (= 100 × 0.65). Furthermore, when the measured output PW, one type of control output, is 65 MW, the corrected output PWm calculated using the second correction coefficient K2 is 90 MW (65 ÷ 0.72).

[0170] As described above, the output corrector 180 of the control device 100 corrects the control output according to the degree of output degradation accompanying the degradation of gas turbine performance.

[0171] Then, follow Figure 19 The flowchart shown explains the overall operation of the control device 100 .

[0172] As described above, the output corrector 180 of the control device 100 corrects the control output based on the degree of output degradation associated with gas turbine performance degradation (output correction step S31). As a result, in this embodiment, the corrected control outputs include the corrected output PWm, the corrected 1500°C MWm, the corrected 700°C MWm, and the corrected limited output LDm.

[0173] The command value generator 110 of the control device 100 uses the corrected control output obtained by executing the output correction step S31 to generate a command value for the control target of the gas turbine 10 (command value generation step S32). The IGV command value generator 160 uses the corrected output PWm to generate the IGV command value IGVc. The combustion load command generator 120 uses the corrected 1500°C MWm and the corrected 700°C MWm to generate the combustion load command CLCSO. The valve command value generator 150 uses the flow rate ratio obtained using the combustion load command CLCSO and the total flow rate of fuel indicated by the CSO from the fuel flow rate command generator 130 to generate a command value for each fuel valve 65, 66, and 67. In addition, the corrected limit output LDm can be, for example, Figure 6 One of the candidates selected by the low value selector 135 of the fuel flow command generator 130 is shown.

[0174] The control signal output unit 190 of the control device 100 outputs a control signal representing a command value to the controlled object (control signal output step S33). The control signal output unit 190 generates a control signal for each of the fuel valves 65, 66, and 67 based on the command value for each of the fuel valves 65, 66, and 67 generated by the valve command value generator 150, and outputs each control signal to each fuel valve 65, 66, and 67. Furthermore, the control signal output unit 190 generates a control signal based on the IGV command value IGVc generated by the IGV command value generator 160, and outputs this control signal to the IGV 14.

[0175] As described above, in this embodiment, a correction coefficient is calculated using multiple coefficient elements e1, e2, and e3. This correction coefficient represents the degree of output degradation associated with gas turbine performance degradation. Furthermore, each of the multiple coefficient elements e1, e2, and e3 represents the degree of output degradation associated with gas turbine performance degradation. However, each of the multiple coefficient elements e1, e2, and e3 represents the degree of output degradation in different time periods. In this embodiment, the correction coefficient is calculated using multiple, different coefficient elements e1, e2, and e3, and the control output is corrected using this correction coefficient. Therefore, in this embodiment, a corrected control output that appropriately reflects the degree of output degradation can be obtained.

[0176] In the present embodiment, if a reset instruction is received during the period from when the gas turbine 10 is completely stopped until the start of the test run, the first coefficient element calculator 184a calculates the first coefficient element e1 during the test run using the current output PW2 of the current time period, rather than the immediately previous output PW1 of the immediately previous time period. Furthermore, if a reset instruction is received during the period from when the gas turbine 10 is completely stopped until the start of the test run, the reset unit 186 in the present embodiment resets the second coefficient element e2 stored in the coefficient element storage unit 185 to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculator 187, specifically, to "1."

[0177] If periodic maintenance is performed before a test run and gas turbine performance is improved by the periodic maintenance, even if the first coefficient element e1 and the second coefficient element e2 are calculated using the output PW1 of the immediately preceding time period before the test run, these first coefficient element e1 and the second coefficient element e2 will not appropriately represent the degree of output degradation. Therefore, as described above, upon receiving a reset instruction, the first coefficient element calculator 184a of this embodiment calculates the first coefficient element e1 using the current output PW2 of the current time period. Furthermore, upon receiving a reset instruction, the reset unit 186 of this embodiment resets the second coefficient element e2 stored in the coefficient element storage unit 185 to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculator 187.

[0178] Therefore, in the present embodiment, even when the test run is started from a state where the gas turbine 10 is completely stopped, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0179] As mentioned above, the relationship between the corrected control output (corrected output PWm), the result of the control output correction, and the IGV command value IGVc may change during the construction test run depending on the results of the construction test run. In this embodiment, during the calculation of the second correction coefficient K2, the reference output PWb used in the calculation of the first coefficient element e1 and the reference output PWb used in the calculation of the third coefficient element e3 cancel each other out. Therefore, the second correction coefficient K2 becomes an element that ignores the reference output PWb at the design time point and instead represents the degree of output degradation prior to the current time period, using the actual output measured during the construction test run (construction output PWc) as a reference.

[0180] As described above, in this embodiment, a corrected control output that appropriately reflects the degree of output degradation can be obtained according to various conditions. Therefore, in this embodiment, by using this corrected control output to create a command value for the controlled object and outputting a control signal representing this command value to the controlled object, it is possible to suppress the occurrence of poor control of the controlled object.

[0181] "Variation"

[0182] like Figure 9 As shown, the correction coefficient calculation unit 187 in the above embodiment includes independent correction coefficient calculation units 187a and 187b for each of the multiple correction coefficients K1 and K2. However, the correction coefficient calculation unit 187 does not need to include an independent correction coefficient calculation unit for each of the multiple correction coefficients K1 and K2. For example, the correction coefficient calculation unit 187 may include, among the functional elements of the first correction coefficient calculation unit 187a and the second correction coefficient calculation unit 187b, a divider 187s, only one multiplier 187t, and a correction coefficient adjuster 187u. In this case, the correction coefficient calculation unit 187 only operates the functions required for calculating the correction coefficient required to correct a particular control output.

[0183] In the above embodiment, examples of control outputs subject to correction include the measured output PW, 1500°C MW, 700°C MW, and the limited output LDx. However, other control outputs may be used as control outputs subject to correction. For example, when determining the flow rate ratio for each of the multiple fuel valves 65, 66, and 67, a load factor may be used in addition to the combustion load command CLCSO. This load factor is the value obtained by dividing the measured output by the maximum output allowed by the gas turbine 10. Therefore, this maximum output may be used as one of the control outputs subject to correction.

[0184] In the above embodiment, the measured output PW is used as an example of a control output corrected using the second correction coefficient K2. However, if the correction result of the control output, i.e., the relationship between the corrected control output and the command value, changes during the construction trial run, the second correction coefficient K2 can be used to correct control outputs other than the measured output PW to obtain a corrected control output.

[0185] Postscript

[0186] For example, the output controller 180 of the gas turbine 10 in the above embodiment can be understood as follows.

[0187] (1) In the output corrector of the gas turbine 10 in the first embodiment,

[0188] The gas turbine 10 includes a compressor 11 capable of compressing air to generate compressed air, a combustor 31 capable of burning fuel in the compressed air to generate combustion gas, and a turbine 21 capable of being driven by the combustion gas. The output corrector of the gas turbine 10 includes: a correction coefficient generator 183 for generating a correction coefficient used when correcting a control output of the gas turbine 10; an output corrector 188 for correcting the control output using the correction coefficient and outputting the corrected control output as a corrected control output; an output receiver 181 for receiving at least an output from an output meter 72 that detects the output of the gas turbine 10; and an output storage 182 for storing the output received by the output receiver 181. The correction coefficient generator 183 includes a first coefficient element calculator 184a for calculating a first coefficient element e1; a second coefficient element calculator 184b for calculating a second coefficient element e2; and a correction coefficient calculator 187 for calculating the correction coefficient using the first coefficient element e1 and the second coefficient element e2. The output storage unit 182 can store: a reference output PWb, which is the output of the gas turbine 10 at a past reference time point under conditions where the gas turbine 10 can output its maximum output; and an immediately previous output PW1 received by the output receiving unit 181 under conditions where the gas turbine 10 can output its maximum output in a time period immediately before the reference time point. The first coefficient element e1 is the ratio of the immediately previous output PW1 stored in the output storage unit 182 to the reference output PWb stored in the output storage unit 182. The second coefficient element e2 is the ratio of the current output PW2 received by the output receiving unit 181 to the immediately previous output PW1 stored in the output storage unit 182 under conditions where the gas turbine 10 can output its maximum output in a current time period from the immediately previous time period to the present.

[0189] In this method, a correction coefficient is calculated using a first coefficient element e1 and a second coefficient element e2. This correction coefficient represents the degree of output degradation associated with gas turbine performance degradation. Furthermore, the first coefficient element e1 and the second coefficient element e2 also represent the degree of output degradation associated with gas turbine performance degradation. However, the first coefficient element e1 and the second coefficient element e2 represent the degree of output degradation in different time periods. Specifically, the first coefficient element e1 represents the output degradation from the reference time point through the immediately preceding time period, while the second coefficient element e2 represents the output degradation from the immediately preceding time period through the current time period. Thus, in this method, a correction coefficient is calculated using multiple different coefficient elements, and the control output is corrected using these correction coefficients.

[0190] Therefore, in this embodiment, it is possible to obtain a correction control output that appropriately reflects the degree of output degradation.

[0191] (2) Output Corrector of the Gas Turbine 10 in the Second Embodiment In the output corrector of the gas turbine 10 in the first embodiment, the first coefficient element calculation unit 184a calculates the first coefficient element e1 using the current output PW2 of the current time period instead of the immediately previous output PW1 of the immediately previous time period, subject to the receipt of a reset instruction.

[0192] The correction coefficient generating unit 183 further includes a coefficient element storage unit 185 capable of storing the first coefficient element e1 calculated by the first coefficient element calculating unit 184a and the second coefficient element e2 calculated by the second coefficient element calculating unit 184b; and a reset unit 186 that, upon receiving the reset instruction, resets the second coefficient element e2 stored in the coefficient element storage unit 185 to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculating unit 187. The correction coefficient calculating unit 187 calculates the correction coefficient using the second coefficient element e2 stored in the coefficient element storage unit 185 and the first coefficient element e1.

[0193] In this embodiment, the first coefficient element calculator 184a and reset unit 186 receive a reset instruction from the complete stop of the gas turbine 10 before the start of a test run. Upon receiving this reset instruction, the first coefficient element calculator 184a calculates the first coefficient element e1 during the test run using the current output PW2 of the current time period, rather than the immediately preceding output PW1 of the immediately preceding time period. Furthermore, the reset unit 186 resets the second coefficient element e2 stored in the coefficient element storage unit 185 to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculator 187.

[0194] If periodic maintenance is performed before a test run and gas turbine performance is improved by the periodic maintenance, even if the first coefficient element e1 and the second coefficient element e2 are calculated using the output PW1 of the immediately preceding time period before the test run, these first coefficient element e1 and the second coefficient element e2 will not appropriately represent the degree of output degradation. Therefore, upon receiving a reset instruction, the first coefficient element calculator 184a of this embodiment calculates the first coefficient element e1 using the current output PW2 of the current time period. Furthermore, upon receiving a reset instruction, the reset unit 186 of this embodiment resets the second coefficient element e2 stored in the coefficient element storage unit 185 to a value that does not affect the calculation result of the correction coefficient by the correction coefficient calculator 187.

[0195] Therefore, in this embodiment, even when the test run is started from a state where the gas turbine 10 is completely stopped, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0196] (3) Output Corrector of the Gas Turbine 10 in the Third Embodiment In the output corrector of the gas turbine 10 in the first or second embodiment, the correction coefficient calculation unit 187 calculates the correction coefficient by multiplying the first coefficient element e1 by the second coefficient element e2.

[0197] (4) Output corrector of the gas turbine 10 in the fourth embodiment In the output corrector of the gas turbine 10 in any one of the first to third embodiments, the reference time point is the design time point of the gas turbine 10, and the reference output PWb is the design output under the condition that the gas turbine 10 can output the maximum output at the design time point.

[0198] (5) Output corrector of the gas turbine 10 in the fifth embodiment In the output corrector of the gas turbine 10 in the fourth embodiment, the immediately preceding time period includes a time period during construction trial operation performed after construction of the gas turbine 10, excluding trial operation after inspection or repair of the gas turbine 10.

[0199] The immediately preceding output PW1 includes the output received by the output receiving unit 181 during the time period of the construction test operation under the condition that the gas turbine 10 can output the maximum output, namely, the construction output PWc. The correction coefficient generating unit 183 further includes a third coefficient element calculating unit 184c for calculating a third coefficient element e3. The correction coefficient calculating unit 187 calculates the correction coefficient using the first coefficient element e1, the second coefficient element e2, and the third coefficient element e3. The third coefficient element e3 represents the ratio of the construction output PWc stored in the output storage unit 182 to the reference output PWb stored in the output storage unit 182.

[0200] The relationship between the corrected control output (i.e., the result of control output correction) and the command value may change during the construction test run based on the results of that construction test run. In this method, when calculating the correction coefficient, the reference output PWb used in calculating the first coefficient element e1 and the reference output PWb used in calculating the third coefficient element e3 may cancel each other out. Consequently, the correction coefficient loses the element of the reference output PWb at the design time and can instead represent the degree of output degradation prior to the current time period based on the actual output measured during the construction test run (i.e., the construction output PWc).

[0201] (6) Output corrector of the gas turbine 10 in the sixth embodiment In the output corrector of the gas turbine 10 in the fifth embodiment, the correction coefficient calculation unit 187 divides the value obtained by multiplying the first coefficient element e1 by the second coefficient element e2 by the third coefficient element e3, and calculates the correction coefficient based on the divided value, or multiplies the value obtained by dividing the first coefficient element e1 by the third coefficient element e3 by the second coefficient element e2, and calculates the correction coefficient based on the multiplied value.

[0202] (7) Output Corrector of the Gas Turbine 10 in the Seventh Aspect In the output corrector of the gas turbine 10 in any one of the first to sixth aspects, the control output is the actual output PW currently received by the output receiving unit 181 from the output meter 72 .

[0203] (8) Output Corrector of the Gas Turbine 10 in the Eighth Embodiment In the output corrector of the gas turbine 10 in any one of the first to sixth embodiments, the control output is a limited output LDx set according to the current temperature of the air sucked into the compressor 11 .

[0204] (9) In the output corrector 180 of the gas turbine 10 in the ninth embodiment, in the output corrector of the gas turbine 10 in any one of the first to sixth embodiments, the control output is the output of the gas turbine 10 when the temperature of the combustion gas currently assumed to reach the inlet of the turbine 21 from the combustor 31, that is, the inlet temperature, becomes a predetermined temperature.

[0205] For example, the control device 100 of the gas turbine 10 in the above embodiment can be understood as follows.

[0206] (10) The control device for the gas turbine 10 in the tenth embodiment includes:

[0207] An output corrector 180 of the gas turbine 10 according to any one of the first to ninth modes; an instruction value generating unit 110 for generating an instruction value for a control object of the gas turbine 10 using the corrected control output obtained by the output corrector 180; and a control signal output unit 190 for outputting a control signal representing the instruction value to the control object.

[0208] As described above, the output corrector of this embodiment can obtain a corrected control output that appropriately reflects the degree of output degradation. Therefore, by using this corrected control output to generate a command value for the controlled object and outputting a control signal representing this command value to the controlled object, it is possible to suppress the occurrence of poor control of the controlled object.

[0209] For example, the output correction method of the gas turbine 10 in the above embodiment can be understood as follows.

[0210] (11) In the eleventh embodiment, in the method for correcting the output of the gas turbine 10,

[0211] The gas turbine 10 includes a compressor 11 capable of compressing air to generate compressed air, a combustor 31 capable of burning fuel in the compressed air to generate combustion gas, and a turbine 21 capable of being driven by the combustion gas. The method for correcting the output of the gas turbine 10 includes the following steps: a correction coefficient creation step S20 for creating a correction coefficient used when correcting the control output of the gas turbine 10; an output correction step S25 for correcting the control output using the correction coefficient and outputting the corrected control output as the corrected control output; an output reception step S11 for receiving at least an output from an output meter 72 that detects the output of the gas turbine 10; and an output storage step S12 for storing the output received in the output reception step S11. The correction coefficient creation step S20 includes a first coefficient element calculation step S21a for calculating a first coefficient element e1; a second coefficient element calculation step S21b for calculating a second coefficient element e2; and a correction coefficient calculation step S24 for calculating the correction coefficient using the first coefficient element e1 and the second coefficient element e2. The output storage step S12 can store: a reference output PWb, which is the output of the gas turbine 10 at a past reference time point under conditions where the gas turbine 10 can output its maximum output; and an immediately previous output PW1 received by the output receiving unit 181 during a time period immediately before the reference time point, under conditions where the gas turbine 10 can output its maximum output. The first coefficient element e1 is the ratio of the immediately previous output PW1 stored in the output storage step S12 to the reference output PWb stored in the output storage step S12. The second coefficient element e2 is the ratio of the current output PW2 received in the output receiving step S11 to the immediately previous output PW1 stored in the output storage step S12 during a current time period from the immediately previous time period to the present, under conditions where the gas turbine 10 can output its maximum output.

[0212] In this embodiment, similarly to the output corrector in the first embodiment, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0213] (12) The output correction method of the gas turbine 10 in the 12th embodiment In the output correction method of the gas turbine 10 in the 11th embodiment, the first coefficient element calculation step S21a calculates the first coefficient element e1 using the current output PW2 of the current time period instead of the immediately previous output PW1 of the immediately previous time period, subject to the condition that a reset instruction has been received.

[0214] The correction coefficient creation step S20 further includes a coefficient element storage step S22 for storing the first coefficient element e1 calculated in the first coefficient element calculation step S21a and the second coefficient element e2 calculated in the second coefficient element calculation step S21b; and a reset step S23 for, upon receiving the reset instruction, resetting the second coefficient element e2 stored in the coefficient element storage step S22 to a value that does not affect the calculation result of the correction coefficient in the correction coefficient calculation step S24. The correction coefficient calculation step S24 calculates the correction coefficient using the second coefficient element e2 stored in the coefficient element storage step S22 and the first coefficient element e1.

[0215] In this embodiment, similarly to the output corrector in the second embodiment, even when the test run is started from a state where the gas turbine 10 is completely stopped, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0216] (13) The output correction method of the gas turbine 10 in the 13th embodiment In the output correction method of the gas turbine 10 in the 11th embodiment or the 12th embodiment, the reference time point is the design time point of the gas turbine 10, and the reference output PWb is the design output under the condition that the gas turbine 10 can output the maximum output at the design time point.

[0217] (14) The output correction method of the gas turbine 10 in the 14th embodiment In the output correction method of the gas turbine 10 in the 13th embodiment, the immediately preceding time period includes a time period during the construction trial operation performed after the construction of the gas turbine 10, excluding the trial operation after the gas turbine 10 is inspected or repaired.

[0218] The immediately preceding output PW1 is the output received in the output receiving step S11, i.e., the construction output PWc, under the condition that the gas turbine 10 can output the maximum output during the time period of the construction test operation. The correction coefficient creation step S20 further includes a third coefficient element calculation step S21c for calculating a third coefficient element e3. In the correction coefficient calculation step S24, the correction coefficient is calculated using the first coefficient element e1, the second coefficient element e2, and the third coefficient element e3. The third coefficient element e3 is the ratio of the construction output PWc stored in the output storage step S12 to the reference output PWb stored in the output storage step S12.

[0219] In this embodiment, similarly to the output corrector in the fifth embodiment, the degree of degradation of the output before the current time period can be expressed based on the construction output PWc, which is the output actually measured during the construction trial operation.

[0220] For example, the control method of the gas turbine 10 in the above embodiment can be understood as follows.

[0221] (15) The control method of the gas turbine 10 in the 15th mode executes the output correction method of the gas turbine 10 in any one of the 11th to 14th modes, and executes the following steps: an instruction value preparation step S32, using the corrected control output obtained by the output correction method to prepare an instruction value for the control object of the gas turbine 10; and a control signal output step S33, outputting a control signal representing the instruction value to the control object.

[0222] In this aspect, similarly to the control device in the twelfth aspect, it is possible to suppress the occurrence of a control failure of the controlled object.

[0223] For example, the output correction program 103pa of the gas turbine 10 in the above embodiment can be understood as follows.

[0224] (16) In the output correction program of the gas turbine 10 in the sixteenth embodiment,

[0225] The gas turbine 10 includes a compressor 11 capable of compressing air to generate compressed air, a combustor 31 capable of burning fuel in the compressed air to generate combustion gas, and a turbine 21 capable of being driven by the combustion gas. The output correction program for the gas turbine 10 causes a computer to execute the following steps: a correction coefficient creation step S20 for creating a correction coefficient used when correcting the control output of the gas turbine 10; an output correction step S25 for correcting the control output using the correction coefficient and outputting the corrected control output as the corrected control output; an output reception step S11 for receiving at least an output from an output meter 72 that detects the output of the gas turbine 10; and an output storage step S12 for storing the output received in the output reception step S11 in a computer storage device. The correction coefficient creation step S20 includes a first coefficient element calculation step S21a for calculating a first coefficient element e1; a second coefficient element calculation step S21b for calculating a second coefficient element e2; and a correction coefficient calculation step S24 for calculating the correction coefficient using the first coefficient element e1 and the second coefficient element e2. In the output storage process S12, the storage device stores: the output under the condition that the gas turbine 10 can output the maximum output at a past reference time point, that is, the reference output PWb; and the immediately previous output PW1 received in the output receiving process S11 under the condition that the gas turbine 10 can output the maximum output in the immediately previous time period closer to the current time point than the reference time point.

[0226] The first coefficient element e1 is a ratio of the immediately preceding output PW1 stored in the storage device in the output storage step S12 to the reference output PWb stored in the storage device in the output storage step S12. The second coefficient element e2 is a ratio of the current output PW2 received in the output receiving step S11 to the immediately preceding output PW1 stored in the storage device in the output storage step S12, under the condition that the gas turbine 10 can output the maximum output in the current time period from the immediately preceding time period to the present time period.

[0227] In this embodiment, similarly to the output corrector in the first embodiment, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0228] (17) Output correction program of the gas turbine 10 in the 17th embodiment In the output correction program of the gas turbine 10 in the 16th embodiment, the first coefficient element calculation step S21a calculates the first coefficient element e1 using the current output PW2 of the current time period instead of the immediately previous output PW1 of the immediately previous time period, subject to the receipt of a reset instruction.

[0229] The correction coefficient preparation process S20 also includes: a coefficient element storage process S22, storing the first coefficient element e1 calculated in the first coefficient element calculation process S21a and the second coefficient element e2 calculated in the second coefficient element calculation process S21b in the storage device; and a reset process S23, if the reset instruction is received, resetting the second coefficient element e2 stored in the storage device in the coefficient element storage process S22 to a value that will not affect the calculation result of the correction coefficient in the correction coefficient calculation process S24.

[0230] In the correction coefficient calculation step S24 , the correction coefficient is calculated using the second coefficient element e2 and the first coefficient element e1 stored in the storage device in the coefficient element storage step S22 .

[0231] In this embodiment, similarly to the output corrector in the second embodiment, even when the test run is started from a state where the gas turbine 10 is completely stopped, a correction control output that appropriately reflects the degree of output degradation can be obtained.

[0232] (18) Output correction program of the gas turbine 10 in the 18th embodiment In the output correction program of the gas turbine 10 in the 16th embodiment or the 17th embodiment, the reference time point is the design time point of the gas turbine 10, and the reference output PWb is the design output under the condition that the gas turbine 10 can output the maximum output at the design time point.

[0233] (19) The output correction program of the gas turbine 10 in the 19th embodiment In the output correction program of the gas turbine 10 in the 18th embodiment, the immediately preceding time period includes a time period during the construction trial operation performed after the construction of the gas turbine 10, except for the trial operation after the gas turbine 10 is inspected or repaired.

[0234] The immediately preceding output PW1 is the output received in the output receiving step S11, i.e., the construction output PWc, under the condition that the gas turbine 10 can output the maximum output during the time period of the construction test operation. The correction coefficient creation step S20 further includes a third coefficient element calculation step S21c for calculating a third coefficient element e3. In the correction coefficient calculation step S24, the correction coefficient is calculated using the first coefficient element e1, the second coefficient element e2, and the third coefficient element e3. The third coefficient element e3 is the ratio of the construction output PWc stored in the storage device in the output storage step S12 to the reference output PWb stored in the storage device in the output storage step S12.

[0235] In this embodiment, similarly to the output corrector in the fifth embodiment, the degree of degradation of the output before the current time period can be expressed based on the construction output PWc, which is the output actually measured during the construction trial operation.

[0236] For example, the control program 103p of the gas turbine 10 in the above embodiment can be understood as follows.

[0237] (20) A control program for the gas turbine 10 in the 20th embodiment, which has an output correction program for the gas turbine 10 of any one of the 16th to 19th embodiments, and causes the computer to execute the following steps: an instruction value preparation step S32, using the corrected control output obtained by executing the output correction program to prepare an instruction value for the control object of the gas turbine 10; and a control signal output step S33, outputting a control signal representing the instruction value to the control object.

[0238] In this aspect, similarly to the control device in the twelfth aspect, it is possible to suppress the occurrence of a control failure of the controlled object.

[0239] Industrial applicability

[0240] In one aspect of the present invention, it is possible to obtain a control output capable of suppressing the occurrence of a control failure of a controlled object associated with gas turbine performance degradation.

[0241] Explanation of symbols

[0242] 10-Gas turbine, 11-Compressor, 12-Compressor housing, 13-Compressor rotor, 14-IGV, 15-Guide vane, 16-Driver, 21-Turbine, 22-Turbine housing, 23-Turbine rotor, 28-Gas turbine rotor, 24-Intermediate housing, 25-Exhaust housing, 29-Generator, 31-Combustor, 32-Outer cylinder, 33-Combustion cylinder (or tail cylinder), 41-Fuel injector, 42-Inner cylinder, 43-Pilot burner, 44-Pilot nozzle, 45-Pilot air cylinder, 48-Pilot air flow path, 49-Diffusion flame, 51-Top hat nozzle, 52-Compressed air flow path, 53-Main burner, 54-Main nozzle, 55-Inner cylinder for main air, 56-Outer cylinder for main air, 5 7- partition, 58- main air flow path, 59- premixed flame, 60- fuel line, 61- pilot fuel line, 62- main fuel line, 63- top hat fuel line, 65- pilot fuel valve, 66- main fuel valve, 67- top hat fuel valve, 71- tachometer, 72- output instrument, 73- intake temperature meter, 74- intake pressure meter, 75- blade passage temperature meter, 76- exhaust temperature meter, 100- control device, 101- CPU, 102- main storage device, 103- auxiliary storage device, 103p- control program, 103pa- output correction program, 104- input device, 105- display device, 106- input and output interface, 107- device interface, 108- communication interface, 10 9-Storage and playback device, 110-Command value generation unit, 120-Combustion load command generator, 121a-700°C MW operator, 121b-1500°C MW operator, 122-Standard atmospheric pressure generator, 123-First divider, 124a-First multiplier, 124b-Second multiplier, 125a-First subtractor, 125b-Second subtractor, 126-Second divider, 127-Limiter, 130-Fuel flow command generator, 131-Speed ​​governor controller, 132-Load controller, 133-Blade channel temperature controller, 134-Exhaust gas temperature controller, 135-Low value selector, 136-Limiter, 140-Flow ratio calculator, 141-Pilot ratio Calculator, 142-top hat ratio calculator, 150-valve instruction value generator, 151-first multiplier, 152-second multiplier, 153-first subtractor, 154-second subtractor, 155-PL valve instruction value calculator, 157-M valve instruction value calculator, 156-TH valve instruction value calculator, 160-IGV instruction value generator, 170-limited output generator, 180-output corrector, 181-output receiving unit, 182-output storage unit, 183-correction coefficient generator, 184a-first coefficient element calculator, 184b-second coefficient element calculator, 184c-third coefficient element calculator, 185-coefficient element storage unit, 185a-first coefficient element storage unit,185b-second coefficient element storage unit, 185c-third coefficient element storage unit, 186-reset unit, 187-correction coefficient calculation unit, 187a-first correction coefficient calculation unit, 187b-second correction coefficient calculation unit, 187s-divider, 187t-multiplier, 187u-correction coefficient adjuster, 188-output correction unit, 188a-first output correction unit, 188b-second output correction unit, 188c-third output correction unit, 188s-divider, 188t-multiplier 188u-Adder, 188v-Low value selector, 188x-First storage unit, 188y-Second storage unit, 190-Control signal output unit, IGVc-IGV command value, e1-First coefficient element, e2-Second coefficient element, e3-Third coefficient element, K1-First correction coefficient, K2-Second correction coefficient, PW-Output (or measured output), PWr-Request output, PWb-Baseline output, PWc-Construction output, PW1-Previous output, PW2-Current output.

Claims

1. An output corrector for a gas turbine, the gas turbine comprising: a compressor capable of compressing air to generate compressed air; a combustor capable of burning fuel in the compressed air to generate combustion gas; and a turbine capable of being driven by the combustion gas, the output corrector for the gas turbine comprising: a correction coefficient generating unit for generating a correction coefficient used when correcting a control output of the gas turbine; an output correction unit that corrects the control output using the correction coefficient and outputs the corrected control output as a modified control output; an output receiving unit that receives at least an output from an output meter that detects an output of the gas turbine; and an output storage unit for storing the output received by the output receiving unit, The correction coefficient preparation unit includes: a first coefficient element calculation unit that calculates a first coefficient element; a second coefficient element calculation unit that calculates the second coefficient element; and A correction coefficient calculation unit calculates the correction coefficient using the first coefficient element and the second coefficient element. The output storage unit can store: a reference output at a past reference time point under a condition that the gas turbine can output the maximum output; and an immediately previous output received by the output receiving unit under a condition that the gas turbine can output the maximum output in a previous time period closer to the present time point. The first coefficient element is a ratio of the immediately preceding output stored in the output storage unit to the reference output stored in the output storage unit. The second coefficient element is a ratio of the current output received by the output receiving unit to the immediately previous output stored in the output storage unit under the condition that the gas turbine can output the maximum output in the current time period from the immediately previous time period to the present.

2. The gas turbine output corrector according to claim 1, wherein: The first coefficient element calculation unit calculates the first coefficient element using the current output of the current time period instead of the immediately previous output of the immediately previous time period, under the condition that a reset instruction is received. The correction coefficient production unit further comprises: a coefficient element storage unit capable of storing the first coefficient element calculated by the first coefficient element calculation unit and the second coefficient element calculated by the second coefficient element calculation unit; and a reset unit that, upon receiving the reset instruction, resets the second coefficient element stored in the coefficient element storage unit to a value that does not affect a calculation result of the correction coefficient by the correction coefficient calculation unit; The correction coefficient calculation unit calculates the correction coefficient using the second coefficient element and the first coefficient element stored in the coefficient element storage unit.

3. The gas turbine output corrector according to claim 1 or 2, wherein: The correction coefficient calculation unit calculates the correction coefficient by multiplying the first coefficient element by the second coefficient element.

4. The output corrector of the gas turbine according to claim 1 or 2, wherein: The reference time point is a design time point of the gas turbine, and the reference output is a design output under the condition that the gas turbine can output a maximum output at the design time point.

5. The gas turbine output corrector according to claim 4, wherein: The immediately preceding time period includes a time period during construction and trial operation, excluding a trial operation after overhaul or repair of the gas turbine, among trial operations performed after construction of the gas turbine. The immediately preceding output is included in the time period during the construction test operation, and the output received by the output receiving unit under the condition that the gas turbine can output the maximum output is the construction output. The correction coefficient preparation unit further includes a third coefficient element calculation unit for calculating a third coefficient element. The correction coefficient calculation unit calculates the correction coefficient using the first coefficient element, the second coefficient element, and the third coefficient element. The third coefficient element is a ratio of the construction output stored in the output storage unit to the reference output stored in the output storage unit.

6. The output corrector of the gas turbine according to claim 5, wherein: The correction coefficient calculation unit divides the value obtained by multiplying the first coefficient element by the second coefficient element by the third coefficient element, and calculates the correction coefficient based on the divided value, or multiplies the value obtained by dividing the first coefficient element by the third coefficient element by the second coefficient element, and calculates the correction coefficient based on the multiplied value.

7. The output corrector of the gas turbine according to claim 1 or 2, wherein: The control output is the actual output currently received by the output receiving unit from the output device.

8. The output corrector of the gas turbine according to claim 1 or 2, wherein: The control output is a limited output set according to the current temperature of the air sucked into the compressor.

9. The output corrector of the gas turbine according to claim 1 or 2, wherein: The control output is the output of the gas turbine when it is currently assumed that the temperature of the combustion gas reaching the turbine inlet from the combustor, that is, the inlet temperature, reaches a predetermined temperature.

10. A gas turbine control device comprising: The output corrector of the gas turbine according to any one of claims 1 to 9; a command value generating unit that generates a command value for a control target of the gas turbine using the corrected control output obtained by the output corrector; and The control signal output unit outputs a control signal indicating the command value to the controlled object.

11. A method for correcting the output of a gas turbine, the gas turbine comprising a compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, and a turbine capable of being driven by the combustion gas, the method comprising: a correction coefficient creating step of creating a correction coefficient used when correcting the control output of the gas turbine; an output correction step of correcting the control output using the correction coefficient and outputting the corrected control output as a modified control output; an output receiving step of receiving at least an output from an output instrument detecting an output of the gas turbine; and an output storing step for storing the output received in the output receiving step; The correction coefficient preparation process includes: A first coefficient element calculation step is to calculate the first coefficient element; a second coefficient factor calculation step of calculating the second coefficient factor; and a correction coefficient calculation step of calculating the correction coefficient using the first coefficient element and the second coefficient element, The output storing step stores: a reference output at a past reference time point under the condition that the gas turbine can output the maximum output; and an immediately previous output received in the output receiving step under the condition that the gas turbine can output the maximum output in a previous time period closer to the present time point. The first coefficient element is a ratio of the immediately preceding output stored in the output storage step to the reference output stored in the output storage step. The second coefficient element is a ratio of the current output received in the output receiving step to the immediately previous output stored in the output storing step under the condition that the gas turbine can output the maximum output in the current time period from the immediately previous time period to the present.

12. The gas turbine output correction method according to claim 11, wherein: In the first coefficient element calculation step, the first coefficient element is calculated using the current output of the current time period instead of the immediately previous output of the immediately previous time period, under the condition that a reset instruction is received. The correction coefficient preparation process also includes: a coefficient element storing step of storing the first coefficient element calculated in the first coefficient element calculating step and the second coefficient element calculated in the second coefficient element calculating step; and a resetting step of resetting the second coefficient element stored in the coefficient element storing step to a value that does not affect a calculation result of the correction coefficient in the correction coefficient calculating step upon receiving the reset instruction; In the correction coefficient calculation step, the correction coefficient is calculated using the second coefficient element and the first coefficient element stored in the coefficient element storage step.

13. The gas turbine output correction method according to claim 11 or 12, wherein: The reference time point is a design time point of the gas turbine, and the reference output is a design output under the condition that the gas turbine can output a maximum output at the design time point.

14. The gas turbine output correction method according to claim 13, wherein: The immediately preceding time period includes a time period during construction and trial operation, excluding a trial operation after overhaul or repair of the gas turbine, among trial operations performed after construction of the gas turbine. The immediately preceding output is included in the time period during the construction test operation, and the output received in the output receiving step under the condition that the gas turbine can output the maximum output is the construction output. The correction coefficient preparation process further includes a third coefficient element calculation process of calculating a third coefficient element. In the correction coefficient calculation step, the correction coefficient is calculated using the first coefficient element, the second coefficient element, and the third coefficient element. The third coefficient element is a ratio of the construction output stored in the output storage step to the reference output stored in the output storage step.

15. A gas turbine control method, comprising: executing the gas turbine output correction method according to any one of claims 11 to 14, and executing the following steps: a command value creating step of creating a command value for a control target of the gas turbine using the corrected control output obtained by the output correction method; and The control signal output step outputs a control signal indicating the command value to the controlled object.

16. A program product comprising an output correction program for a gas turbine, the gas turbine comprising a compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, and a turbine capable of being driven by the combustion gas, the output correction program for the gas turbine causing a computer to execute the following steps: a correction coefficient creating step of creating a correction coefficient used when correcting the control output of the gas turbine; an output correction step of correcting the control output using the correction coefficient and outputting the corrected control output as a modified control output; an output receiving step of receiving at least an output from an output instrument detecting an output of the gas turbine; and an output storing step of storing the output received in the output receiving step in a storage device of a computer, The correction coefficient preparation process includes: A first coefficient element calculation step is to calculate the first coefficient element; a second coefficient factor calculation step of calculating the second coefficient factor; and a correction coefficient calculation step of calculating the correction coefficient using the first coefficient element and the second coefficient element, In the output storing step, the storage device stores: a reference output which is an output at a past reference time point under a condition that the gas turbine can output a maximum output; and an immediately previous output received in the output receiving step under a condition that the gas turbine can output a maximum output in an immediately previous time period closer to the present time point. The first coefficient element is a ratio of the immediately preceding output stored in the storage device in the output storage step to the reference output stored in the storage device in the output storage step. The second coefficient element is the ratio of the current output received in the output receiving process to the immediately previous output stored in the storage device in the output storage process under the condition that the gas turbine can output the maximum output in the current time period from the immediately previous time period to the present.

17. The program product according to claim 16, wherein In the first coefficient element calculation step, the first coefficient element is calculated using the current output of the current time period instead of the immediately previous output of the immediately previous time period, under the condition that a reset instruction is received. The correction coefficient preparation process also includes: a coefficient element storing step of storing the first coefficient element calculated in the first coefficient element calculating step and the second coefficient element calculated in the second coefficient element calculating step in the storage device; and a resetting step of resetting the second coefficient element stored in the storage device in the coefficient element storing step to a value that does not affect the calculation result of the correction coefficient in the correction coefficient calculating step upon receiving the reset instruction; In the correction coefficient calculation step, the correction coefficient is calculated using the second coefficient element and the first coefficient element stored in the storage device.

18. The program product according to claim 16 or 17, wherein The reference time point is a design time point of the gas turbine, and the reference output is a design output under the condition that the gas turbine can output a maximum output at the design time point.

19. The program product according to claim 18, wherein The immediately preceding time period includes a time period during construction and trial operation, excluding a trial operation after overhaul or repair of the gas turbine, among trial operations performed after construction of the gas turbine. The immediately preceding output is included in the time period during the construction test operation, and the output received in the output receiving step under the condition that the gas turbine can output the maximum output is the construction output. The correction coefficient preparation process further includes a third coefficient element calculation process of calculating a third coefficient element. In the correction coefficient calculation step, the correction coefficient is calculated using the first coefficient element, the second coefficient element, and the third coefficient element. The third coefficient element is a ratio of the construction output stored in the storage device in the output storage step to the reference output stored in the storage device in the output storage step.

20. A program product comprising a control program for a gas turbine, the control program comprising the gas turbine output correction program according to any one of claims 16 to 19, and causing the computer to execute the following steps: a command value creating step of creating a command value for a control target of the gas turbine using the corrected control output obtained by executing the output correction program; and The control signal output step outputs a control signal indicating the command value to the controlled object.

Images