A gas turbine IGV opening degree control method and system

Abstract

This invention provides a gas turbine IGV opening control method and system, belonging to the field of gas turbine control technology. It solves the problems of IGV control lag and large temperature fluctuations caused by turbine exhaust temperature inertia in existing technologies. The method includes: acquiring the turbine exhaust temperature setpoint and actual value; calculating a first IGV opening command using a PID controller; calculating a compressor inlet air flow target value based on a minimum fuel flow reference, and performing environmental correction based on compressor inlet temperature and pressure to obtain a converted flow target value; calculating the pressure ratio based on the compressor outlet pressure and inlet pressure, and calculating a second IGV opening command based on the converted flow target value and pressure ratio; and superimposing the first and second IGV opening commands to obtain the final IGV opening command. This invention achieves feedforward and feedback composite control, improving exhaust temperature control stability and unit operation safety.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine control technology, specifically relating to a gas turbine IGV opening degree control method and system. Background Technology

[0002] The inlet guide vane (IGV) is located at the compressor inlet of the gas turbine, and its core function is to regulate the airflow and angle entering the compressor. After the gas turbine is connected to the grid and operating under load, the IGV is mainly used to control the turbine exhaust temperature, which is crucial for improving the unit's combustion stability and thermal efficiency. Existing gas turbine control systems (TCS) are typically designed with an IGV temperature control line, which calculates the turbine exhaust temperature setpoint based on operating conditions and adjusts the IGV opening to stabilize the actual exhaust temperature at the setpoint. Traditional IGV control strategies mainly employ PID feedback control. That is, using the deviation between the turbine exhaust temperature setpoint and the actual value, the PID controller calculates the IGV opening command: when the exhaust temperature is low, the IGV opening is reduced to decrease the intake air volume, and vice versa.

[0003] However, existing technologies have significant shortcomings: due to the strong thermal inertia of turbine exhaust temperature, changes in turbine exhaust temperature lag behind changes in unit operating conditions (such as environmental factors and unit load). Traditional control methods require the PID controller to activate only after the actual turbine exhaust temperature or setpoint changes. This lag causes significant fluctuations in turbine exhaust temperature during changes in operating conditions before the unit can regain stability, which is detrimental to the safe and stable operation of the unit. Therefore, we propose a gas turbine IGV opening control method and system. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a gas turbine IGV opening degree control method and system.

[0005] This invention provides a method for controlling the opening degree of an IGV (Inlet Gas Vault) in a gas turbine, comprising the following steps: The turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine are obtained, and the first IGV opening command is calculated based on the deviation between the two. Obtain the minimum fuel flow rate reference of the gas turbine, and collect the inlet temperature, inlet pressure, and outlet pressure of the compressor; The target value of the compressor inlet air flow of the gas turbine is calculated based on the minimum fuel flow benchmark, and the target value of the compressor inlet air flow is corrected by environmental parameters to obtain the target value of the compressor inlet converted flow. The pressure ratio of the compressor is calculated based on the outlet pressure and inlet pressure of the compressor. Based on the compressor inlet converted flow target value and the pressure ratio, calculate the second IGV opening command; The first IGV opening command is used as a feedback control quantity, and the second IGV opening command is used as a feedforward control quantity. The two are superimposed to obtain the final gas turbine IGV opening command.

[0006] Further, the step of obtaining the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine, and calculating the first IGV opening command based on the deviation between the two, includes: The difference between the turbine exhaust temperature setpoint and the actual turbine exhaust temperature is calculated, and the difference is input to the PID controller. The first IGV opening command is then calculated based on the PID controller.

[0007] Specifically, calculating the target value of the compressor inlet air flow rate based on the minimum fuel flow rate benchmark includes: For a gas turbine equipped with a compressor inlet air flow measurement point, the historical operating data of the gas turbine is used to fit a functional relationship between the minimum fuel flow reference and the actual compressor inlet air flow when the IGV is at the intermediate opening, and the target value of the compressor inlet air flow is calculated based on this functional relationship; for a gas turbine without a compressor inlet air flow measurement point, the virtual functional mapping relationship between the target value of the compressor inlet air flow and the minimum fuel flow reference is manually tuned.

[0008] Specifically, for the gas turbine equipped with the compressor inlet air flow measurement point, the calculation formula for the target value of the compressor inlet air flow is as follows:

[0009] in, The minimum fuel flow rate benchmark after normalization. A and B The coefficients are obtained by fitting the historical operating data of the gas turbine.

[0010] Preferably, the target value of the compressor inlet air flow rate is corrected for environmental parameters to obtain the target value of the compressor inlet converted flow rate, including: The formula for calculating the environmental parameter correction of the target value of the compressor inlet air flow is as follows:

[0011] in, The target value for the inlet flow rate of the compressor is [value to be filled in]. The target value for the inlet air flow rate of the compressor. COR T This is the inlet temperature correction factor for the compressor. COR P This is the inlet pressure correction factor for the compressor.

[0012] Specifically, the formula for calculating the compressor pressure ratio is as follows:

[0013]

[0014] in, The compressor pressure ratio is [value missing]. P 2 represents the outlet pressure of the compressor. P 1 represents the inlet pressure of the compressor. K The full-load pressure ratio constant of the gas turbine under ISO operating conditions is given.

[0015] Further, the step of calculating the second IGV opening command based on the compressor inlet reduced flow target value and the compressor pressure ratio includes: Using the historical operating data of the gas turbine, a fitting function relationship or a two-dimensional difference grid is constructed between the actual compressor inlet equivalent flow rate, the actual IGV opening and the compressor pressure ratio of the gas turbine. The calculated compressor inlet equivalent flow target value and compressor pressure ratio are substituted into the fitting function relationship or two-dimensional difference grid to calculate the second IGV opening command.

[0016] Furthermore, the gas turbine IGV opening control method also includes a feedforward control activation step, comprising: Set enable signal EN When the enable signal EN When the value is valid, the calculation logic for the second IGV opening command is executed, and the first IGV opening command and the second IGV opening command are superimposed to obtain the final gas turbine IGV opening command; when the activation signal is active... EN When the value is invalid, the second IGV opening command retains the enable signal. EN The output value of the second IGV opening command remains unchanged when it becomes an invalid value.

[0017] Another aspect of the present invention provides a gas turbine IGV opening control system, including a controller and a memory, wherein the memory is used to store a computer program, and the controller is used to execute the computer program to implement the gas turbine IGV opening control method as described above.

[0018] The beneficial effects of this invention are as follows: This invention introduces an IGV opening feedforward control quantity based on the minimum fuel flow reference, on the basis of traditional PID feedback control. This allows the IGV to act in advance before changes in operating conditions cause fluctuations in turbine exhaust temperature, thereby effectively reducing the overshoot and fluctuation amplitude of turbine exhaust temperature and improving combustion stability and unit operation safety. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the steps of a gas turbine IGV opening control method according to a specific embodiment of the present invention. Figure 2 This is a control logic diagram of a gas turbine IGV opening control method according to a specific embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, a specific embodiment of the present invention provides a gas turbine IGV opening degree control method, which includes the following steps: Obtain the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine, and calculate the first IGV opening command based on the deviation between the two. Obtain the minimum fuel flow rate reference for the gas turbine, and collect the inlet temperature, inlet pressure, and outlet pressure of the compressor; The target value of the compressor inlet air flow rate of the gas turbine is calculated based on the minimum fuel flow rate benchmark, and the target value of the compressor inlet air flow rate is corrected by environmental parameters to obtain the target value of the compressor inlet converted flow rate. Calculate the compressor's pressure ratio based on the compressor's outlet and inlet pressures; Calculate the second IGV opening command based on the compressor inlet equivalent flow target value and pressure ratio; The first IGV opening command is used as the feedback control quantity, and the second IGV opening command is used as the feedforward control quantity. The two are superimposed to obtain the final gas turbine IGV opening command.

[0022] Specifically, the first IGV opening command is a feedback control quantity based on the turbine exhaust temperature deviation, used to correct the deviation between the turbine exhaust temperature and the set value, thereby achieving closed-loop temperature regulation.

[0023] Furthermore, the second IGV opening command is a feedforward control quantity calculated based on the minimum fuel flow reference, used to adjust the IGV opening in advance at the initial stage of fuel flow change.

[0024] Furthermore, by superimposing the first IGV opening command with the second IGV opening command, a composite control strategy of "feedforward coarse adjustment + feedback fine adjustment" is achieved, thereby taking into account both fast response and steady-state accuracy.

[0025] Based on the above basic implementation method, the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine are obtained, and the first IGV opening command is calculated based on the deviation between the two, including: The turbine exhaust temperature setpoint is calculated by subtracting the actual turbine exhaust temperature. The difference is then input to the PID controller. The PID controller calculates the first IGV opening command to achieve zero-error regulation of the turbine exhaust temperature.

[0026] Specifically, the PID controller can employ a proportional-integral-derivative control algorithm, where the proportional element is used to quickly respond to temperature deviations, the integral element is used to eliminate steady-state errors, and the derivative element is used to suppress overshoot and oscillations; the PID parameters can be tuned according to different gas turbine models.

[0027] In one specific implementation, calculating the target value of the compressor inlet air flow rate based on the minimum fuel flow rate benchmark includes: For gas turbines equipped with compressor inlet air flow measurement points, the historical operating data of the gas turbine is used to fit the functional relationship between the minimum fuel flow reference and the actual compressor inlet air flow when the IGV is at the intermediate opening, and the target value of compressor inlet air flow is calculated based on this functional relationship. For gas turbines without compressor inlet air flow measurement points, the functional mapping relationship between the virtual compressor inlet air flow target value and the minimum fuel flow reference is manually tuned.

[0028] For the gas turbine equipped with a compressor inlet air flow measurement point, the formula for calculating the target value of the compressor inlet air flow is:

[0029] in, This serves as the benchmark for the minimum fuel flow rate after normalization. A and B These are the coefficients obtained by fitting historical operating data of the gas turbine.

[0030] In this embodiment, the minimum fuel flow rate reference is the feedforward reference value of the IGV opening control, and its change usually precedes the actual fuel flow rate change.

[0031] Furthermore, by using the minimum fuel flow rate benchmark to calculate the target value of the compressor inlet air flow rate, the air flow rate can be adjusted in advance at the initial stage of load change, thereby improving the response speed.

[0032] In another specific embodiment, the target value of the compressor inlet air flow rate is corrected for environmental parameters to obtain the target value of the compressor inlet converted flow rate, including: The formula for calculating the environmental parameter correction for the target value of compressor inlet airflow is as follows:

[0033] in, This represents the target inlet flow rate of the compressor. This represents the target inlet airflow rate for the compressor. COR T This is the compressor inlet temperature correction factor. COR P This is the compressor inlet pressure correction factor.

[0034] In one specific implementation, the formula for calculating the compressor pressure ratio is:

[0035] in, The compressor pressure ratio. P 2 represents the compressor outlet pressure. P 1 represents the compressor inlet pressure. K This is the full-load pressure ratio constant of the gas turbine under ISO operating conditions.

[0036] In this embodiment, the pressure ratio is an important parameter reflecting the working state of the compressor. The compressor's equivalent speed, equivalent flow rate, and pressure ratio constitute the compressor's characteristic curve. Since the equivalent speed does not change much after the gas turbine is connected to the grid and the feedforward control has low accuracy requirements, the influence of the equivalent speed can be ignored. However, the pressure ratio changes significantly and must be considered. Therefore, when constructing the IGV opening feedforward control model, the pressure ratio must be regarded as a key input variable.

[0037] Specifically, by using a uniform pressure ratio, the effects caused by the different dimensions of different parameters can be eliminated.

[0038] In another specific embodiment, the step of calculating the second IGV opening command based on the compressor inlet reduced flow target value and the compressor pressure ratio includes: Using historical operating data of the gas turbine, a fitting function relationship or two-dimensional difference grid is constructed between the actual compressor inlet equivalent flow rate, the actual IGV opening and the compressor pressure ratio of the gas turbine. The calculated compressor inlet equivalent flow target value and compressor pressure ratio are substituted into the fitting function relationship or two-dimensional difference grid to calculate the second IGV opening command.

[0039] Furthermore, the second IGV opening command is obtained by fitting a functional relationship.

[0040] Furthermore, two-dimensional interpolation algorithms, least squares fitting methods, or neural network models can be used to construct the mapping relationship between the compressor inlet reduced flow rate, pressure ratio, and actual IGV opening.

[0041] In another specific embodiment, the gas turbine IGV opening control method further includes a feedforward control activation step, comprising: Set enable signal EN When the signal is enabled EN When the value is valid, the calculation logic for the second IGV opening command is executed, and the first IGV opening command and the second IGV opening command are superimposed to obtain the final gas turbine IGV opening command; when the activation signal is enabled... EN When the value is invalid, the second IGV opening command retains the enabled signal. EN The output value of the second IGV opening command remains unchanged when it becomes invalid, so that the control strategy of the gas turbine IGV opening control method is restored to feedback control based on the PID controller, and sudden changes in IGV opening can be avoided.

[0042] Furthermore, after disabling feedforward control, the system automatically reverts to pure PID feedback control mode.

[0043] In another specific embodiment, such as Figure 2 As shown, in the division block, N is the numerator, D is the denominator, W is the setpoint of the PID controller, X is the deviation of the PID controller, and FX1 is the minimum fuel flow reference when the IGV is at the intermediate opening (excluding the conditions when the IGV is at its maximum and minimum opening) based on the unit's operating data fitting. U MIN Compared with the actual compressor inlet air flow F AIR The relationship is that FX2 is the target flow rate converted through the compressor inlet. F RAIRSET Calculate the second IGV opening command based on the compressor pressure ratio. U IGV2 The functional relationship; This embodiment adopts the IGV opening degree control method of the present invention. On the basis of traditional PID feedback control, an IGV opening degree feedforward control quantity based on the minimum fuel flow reference is introduced, so that the IGV can act in advance before the change of operating conditions causes the turbine exhaust temperature to fluctuate, thereby effectively reducing the overshoot and fluctuation amplitude of turbine exhaust temperature, and improving combustion stability and unit operation safety.

[0044] One specific embodiment of the present invention provides a gas turbine IGV opening control system, including a controller and a memory. The memory is used to store a computer program, and the controller is used to execute the computer program to implement the gas turbine IGV opening control method as described above.

[0045] To aid in a better understanding of the present invention, a more comprehensive and specific embodiment is described, in which the present invention provides a gas turbine IGV opening control method, comprising the following steps: Obtain the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine, and calculate the first IGV opening command based on the deviation between the two. Obtain the minimum fuel flow rate reference for the gas turbine, and collect the inlet temperature, inlet pressure, and outlet pressure of the compressor; The target value of the compressor inlet air flow rate of the gas turbine is calculated based on the minimum fuel flow rate benchmark, and the target value of the compressor inlet air flow rate is corrected by environmental parameters to obtain the target value of the compressor inlet converted flow rate. Calculate the compressor's pressure ratio based on the compressor's outlet and inlet pressures; Calculate the second IGV opening command based on the compressor inlet equivalent flow target value and pressure ratio; The first IGV opening command is used as the feedback control quantity, and the second IGV opening command is used as the feedforward control quantity. The two are superimposed to obtain the final gas turbine IGV opening command.

[0046] In this embodiment, obtaining the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine, and calculating the first IGV opening command based on the deviation between the two, includes: The turbine exhaust temperature setpoint is subtracted from the actual turbine exhaust temperature, and the difference is input to the PID controller. The PID controller calculates the first IGV opening command. The compressor inlet air flow target value is calculated based on the minimum fuel flow reference, including: For gas turbines equipped with compressor inlet air flow measurement points, the historical operating data of the gas turbine is used to fit a functional relationship between the minimum fuel flow reference and the actual compressor inlet air flow at the intermediate opening of the IGV, and the target value of the compressor inlet air flow is calculated based on this functional relationship; for gas turbines without compressor inlet air flow measurement points, the virtual functional mapping relationship between the target value of the compressor inlet air flow and the minimum fuel flow reference is manually tuned. For a gas turbine equipped with a compressor inlet air flow measurement point, the formula for calculating the target value of the compressor inlet air flow is:

[0047] in, This serves as the benchmark for the minimum fuel flow rate after normalization. A and B These are coefficients obtained by fitting historical operating data of the gas turbine. Environmental parameter corrections are applied to the target compressor inlet airflow rate to obtain the equivalent target compressor inlet flow rate, which includes: The formula for calculating the environmental parameter correction for the target value of compressor inlet airflow is as follows:

[0048] in, This represents the target inlet flow rate of the compressor. This represents the target inlet airflow rate for the compressor. COR T This is the compressor inlet temperature correction factor. COR P This is the compressor inlet pressure correction factor. T 1 represents the compressor inlet temperature. P 1 represents the compressor inlet pressure; The formula for calculating the compressor pressure ratio is:

[0049] in, The compressor pressure ratio. P 2 represents the compressor outlet pressure. P 1 represents the compressor inlet pressure. K This represents the full-load pressure ratio constant of the gas turbine under ISO operating conditions. The steps for calculating the second IGV opening command based on the compressor inlet converted flow target value and compressor pressure ratio include: Using historical operating data of the gas turbine, a fitting function relationship or two-dimensional difference grid is constructed between the actual compressor inlet equivalent flow rate, the actual IGV opening and the compressor pressure ratio of the gas turbine. Substitute the calculated compressor inlet equivalent flow target value and compressor pressure ratio into the fitting function relationship or two-dimensional difference grid to calculate the second IGV opening command; The gas turbine IGV opening control method also includes a feedforward control activation step, including: Set enable signal EN When the signal is enabled EN When the value is valid, the calculation logic for the second IGV opening command is executed, and the first IGV opening command and the second IGV opening command are superimposed to obtain the final gas turbine IGV opening command; when the activation signal is enabled... EN When the value is invalid, the second IGV opening command retains the enabled signal. EN The output value of the second IGV opening instruction remains unchanged when it becomes invalid.

[0050] Furthermore, another aspect of the present invention provides a gas turbine IGV opening control system, including a controller and a memory, wherein the memory is used to store a computer program, and the controller is used to execute the computer program to implement the gas turbine IGV opening control method as described above.

[0051] In summary, the embodiments disclosed herein have at least the following technical effects: Based on traditional PID temperature control feedback control, a feedforward control quantity based on minimum fuel flow is introduced, enabling the IGV to act in advance at the initial stage of unit load change or operating condition disturbance, without having to wait for a significant change in turbine exhaust temperature, thereby effectively overcoming the control lag problem caused by exhaust temperature inertia. By using a composite control method of "feedforward coarse adjustment + PID feedback fine adjustment", this invention can effectively suppress the overshoot and fluctuation of turbine exhaust temperature during variable operating conditions, enabling the exhaust temperature to return to the IGV temperature control line more quickly and smoothly, thereby improving combustion stability and unit operation safety. This invention introduces compressor inlet temperature and pressure corrections in the calculation of feedforward control quantities, and uses the converted flow target value to eliminate the influence of environmental parameter changes, so that the control algorithm can maintain high accuracy and robustness under different seasons, different altitudes and different environmental conditions. This invention constructs a mapping relationship between equivalent flow rate, pressure ratio and IGV opening through historical operating data, without relying on the manufacturer's confidential compressor characteristic lines, making it easy to implement on different types of gas turbines and having good engineering promotion value; This invention sets an enable signal EN The feedforward control can be enabled or disabled by the operators at any time as needed, and the output can be smoothly transitioned when it is disabled to avoid disturbance to the unit caused by sudden changes in IGV opening degree, thereby enhancing the safety and operability of the control strategy. This invention optimizes turbine exhaust temperature control, thereby reducing component thermal stress and lifespan loss caused by temperature fluctuations, thus improving the long-term economic efficiency and reliability of the unit.

[0052] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling the opening degree of an IGV (Inlet Gas Vault) in a gas turbine, characterized in that, Includes the following steps: The turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine are obtained, and the first IGV opening command is calculated based on the deviation between the two. Obtain the minimum fuel flow rate reference of the gas turbine, and collect the inlet temperature, inlet pressure, and outlet pressure of the compressor; The target value of the compressor inlet air flow rate of the gas turbine is calculated based on the minimum fuel flow rate benchmark, and the target value of the compressor inlet air flow rate is corrected by environmental parameters to obtain the target value of the compressor inlet converted flow rate. The pressure ratio of the compressor is calculated based on the outlet pressure and inlet pressure of the compressor. Based on the compressor inlet converted flow target value and the pressure ratio, calculate the second IGV opening command; The first IGV opening command is used as a feedback control quantity, and the second IGV opening command is used as a feedforward control quantity. The two are superimposed to obtain the final gas turbine IGV opening command.

2. The gas turbine IGV opening degree control method according to claim 1, characterized in that, The step of obtaining the turbine exhaust temperature setpoint and the actual turbine exhaust temperature of the gas turbine, and calculating the first IGV opening command based on the deviation between the two, includes: The difference between the turbine exhaust temperature setpoint and the actual turbine exhaust temperature is calculated, and the difference is input to the PID controller. The first IGV opening command is then calculated based on the PID controller.

3. The gas turbine IGV opening control method according to claim 1, characterized in that, The calculation of the compressor inlet air flow target value based on the minimum fuel flow benchmark includes: For a gas turbine equipped with a compressor inlet air flow measurement point, the historical operating data of the gas turbine is used to fit a functional relationship between the minimum fuel flow reference and the actual compressor inlet air flow when the IGV is at the intermediate opening, and the target value of the compressor inlet air flow is calculated based on this functional relationship; for a gas turbine without a compressor inlet air flow measurement point, the virtual functional mapping relationship between the target value of the compressor inlet air flow and the minimum fuel flow reference is manually tuned.

4. The gas turbine IGV opening control method according to claim 3, characterized in that, For the gas turbine equipped with the compressor inlet air flow measurement point, the formula for calculating the target value of the compressor inlet air flow is: in, The minimum fuel flow rate benchmark after normalization. A and B The coefficients are obtained by fitting the historical operating data of the gas turbine.

5. The gas turbine IGV opening control method according to claim 1, characterized in that, The target value of the compressor inlet air flow rate is corrected for environmental parameters to obtain the target value of the compressor inlet converted flow rate, which includes: The formula for calculating the environmental parameter correction of the target value of the compressor inlet air flow is as follows: in, The target value for the inlet flow rate of the compressor is [value to be filled in]. The target value for the inlet air flow rate of the compressor. COR T This is the inlet temperature correction factor for the compressor. COR P This is the inlet pressure correction factor for the compressor.

6. The gas turbine IGV opening control method according to claim 1, characterized in that, The formula for calculating the compressor pressure ratio is: in, The compressor pressure ratio is [value missing]. P 2 represents the outlet pressure of the compressor. P 1 represents the inlet pressure of the compressor. K The full-load pressure ratio constant of the gas turbine under ISO operating conditions is given.

7. The gas turbine IGV opening control method according to claim 1, characterized in that, The step of calculating the second IGV opening command based on the compressor inlet converted flow target value and the compressor pressure ratio includes: Using the historical operating data of the gas turbine, a fitting function relationship or a two-dimensional difference grid is constructed between the actual compressor inlet equivalent flow rate, the actual IGV opening and the compressor pressure ratio of the gas turbine. The calculated compressor inlet equivalent flow target value and compressor pressure ratio are substituted into the fitting function relationship or two-dimensional difference grid to calculate the second IGV opening command.

8. The gas turbine IGV opening control method according to any one of claims 2 to 7, characterized in that, The gas turbine IGV opening control method further includes a feedforward control activation step, comprising: Set enable signal EN When the enable signal EN When the value is valid, the calculation logic for the second IGV opening command is executed, and the first IGV opening command and the second IGV opening command are superimposed to obtain the final gas turbine IGV opening command; when the activation signal is active... EN When the value is invalid, the second IGV opening command retains the enable signal. EN The output value of the second IGV opening command remains unchanged when it becomes an invalid value.

9. A gas turbine IGV opening control system, characterized in that, It includes a controller and a memory, the memory being used to store a computer program, and the controller being used to execute the computer program to implement the gas turbine IGV opening control method as described in any one of claims 1 to 8.

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