JPH0882228A - Variable guide vane control device for gas turbine - Google Patents

Abstract

PURPOSE: To ensure the volume weight of the air to be sucked at a constant value even when the temperature of the air to be sucked by an air compressor is changed, prevent the surging of a blade by the ensurement of this constant value, and guarantee the stable operation of a gas turbine. CONSTITUTION: The movable guide blade 2 of an air compressor 1 has a blade opening correcting circuit 20 for making a blade opening signal based on an atmospheric temperature change, making an exhaust gas temperature converted value of a turbine 5 on the basis of the compressed air from the air compressor 1, adding the actual exhaust gas temperature of the turbine 5 to the exhaust gas temperature converted value followed by operation, and selecting a higher value signal of the resulting arithmetic signal and the blade opening signal to output a blade opening correction signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable guide vane control device for a gas turbine, and more particularly to a variable guide vane control device for a gas turbine suitable for preventing surging that occurs during operation of an air compressor.

[0002]

2. Description of the Related Art A gas turbine having an air compressor directly connected to a turbine has a very short starting time as compared with a steam turbine. As a prime mover for so-called combined cycle power generation, a large number of such prime movers are implemented, and a typical configuration example thereof is shown in FIG.

This gas turbine comprises an air compressor 1, a combustor 4 and a turbine 5.

The air compressor 1 is of a so-called axial flow type in which the blades 3 are arranged in multiple stages along the flow of the atmosphere (air). When it is loaded, it is opened and closed to adjust the flow rate of the inhaled air.

In the gas turbine having such a structure, the air compressor 1 adjusts the opening of the variable guide vane 2 to suck in the atmosphere, and is compressed by the blades 3 arranged in multiple stages, and the compressed high pressure. The fluid is sent to the combustor 4, where the fuel from the fuel valve 6 is added to create working gas, and the created working gas is sent to the turbine 5 to perform expansion work to obtain rotational torque, and after expansion work. The working gas is discharged to the atmosphere as exhaust gas, and the rotational torque obtained by the expansion work is transmitted to a generator (not shown) to extract electric power.

By the way, the variable guide vanes 2 have a fluctuation in the atmosphere sucked from the compressed air 1 at the time of starting or partial load, and therefore, the occurrence of surging (stall) in the vanes 2 arranged on the stage vanes is avoided. For opening and closing,
The blade opening calculation circuit shown in FIG. 9 is used.

The blade opening calculation circuit indicated by reference numeral 10 as a whole is
Function generator 12, variable blade opening constant setting device 11, calculation parts 13, 15, high value selection circuit 16, blade opening position control circuit 1
8 is provided.

In the blade opening calculation circuit 10 having the above structure,
The function generator 12 receives the compressed air pressure signal from the pressure detector 11 provided on the outlet side of the air compressor 1, and the temperature conversion value of the exhaust gas emitted from the turbine 5 is generated here based on the air pressure signal. . The output signal of the exhaust gas temperature conversion value generated by the function generator 12 is calculated by the calculation unit 1
Out of 3, 15 is sent to the subtraction unit 13, where it is matched with the actual exhaust gas temperature signal from the temperature detector 14 provided on the outlet side of the turbine 5, and after subtraction, proportional / integral operation is performed by the calculation unit 15. , To the high price selection circuit 16.

The high value selection circuit 16 receives the signal from the variable guide vane opening constant setter 17 as another output signal, and it is matched here and selects one of the high value signals to select the blade opening position. It is sent to the control circuit 18.

The blade opening position control circuit 18 receives the actual variable blade opening position signal from the detector 19 provided in the variable guide blade driving section 2a as a feedback in addition to the above-mentioned output signal. When a deviation occurs, the deviation is given to the variable guide vane drive unit 2a to correct the opening position of the variable guide vane 2.

In this way, the conventional blade opening calculation circuit 1
0 prevents the temperature of the working gas sent to the turbine 5 from being lowered due to the fluctuation of the air sucked by the air compressor 1 at the time of start-up or partial load, while suppressing the surging of the blades 3 of the air compressor 1. I was dealing with it.

[0012]

Conventionally, the relationship between the gas turbine output (load) and the variable guide vane opening is, as shown in FIG. 10, the variable guide vane 2 at the time of startup or partial load. Is held at a constant opening as a given value, and the output of the gas turbine is fully opened at a boundary of 70 to 80% or the throttle opening (constant opening) is controlled. The air compressor 1 regulates the flow rate of the intake air under the control of the opening degree of the variable guide vanes 2 as described above. However, when the opening degree of the variable guide vanes 2 is kept constant, the air compressor 1 Surging often occurs on the wing 3 of the.

FIG. 11 is a diagram showing the operating range (opening) of the variable guide vane 2 in the operating method of the variable guide vane 2 described above in relation to the atmospheric temperature, and the hatched portion a is the operating range. When the atmospheric temperature decreases, the density of the air becomes thicker and the denser air is pushed into the combustor 4, so that the pressure of the compressed air rises. If the pressure of the compressed air rises, the volume of the air decreases, the flow velocity of the air flowing through the compressor blade 3 decreases, and the stall phenomenon in the compressor blade 3 easily occurs.

On the other hand, if the opening of the variable guide vanes 2 is reduced, the flow rate of the air sucked by the compressor 1 is drastically reduced, the flow velocity of the air passing through the compressor vanes 3 is reduced, and The stall phenomenon is likely to occur.

From the above principle, when the atmospheric temperature is low,
Moreover, in an operating state in which the opening degree of the variable guide vanes 2 is small, the flow velocity of the air in the compressor vanes 3 decreases, and the stall phenomenon is likely to occur.

A stall phenomenon, that is, a surging phenomenon in the compressor blade 3 occurs in the black-painted region b of the extremely low atmospheric temperature in the operating range shown in FIG.

This surging is more specifically described with reference to FIG.
2 is used for the explanation. Conventionally, at the time of startup or partial load, the variable guide vanes 2 are kept at a constant opening as a given value as described above to prevent the temperature of the working gas sent to the turbine 5 from decreasing, while preventing the surging. Although there is
The atmosphere sucked by the air compressor 1 has a relationship in which the volumetric weight sucked increases or decreases in proportion to the temperature change. Therefore, when the atmospheric temperature decreases, the density of the atmosphere increases,
The compressed fluid pressure pressed by the blades 3 of the air compressor 1 becomes excessively high, and accordingly, the flow velocity passing through the inside of the machine is significantly reduced. Due to this decrease in the flow velocity, as shown in FIG. 5, boundary separation occurs on the back side of the blade 3, and the compressed fluid passes at the moment the negative pressure momentarily occurs in this region, so that the blade 3 is surging. ing.

To prevent the occurrence of surging, as described in FIG. 9, the temperature of the working gas sent from the combustor 4 to the turbine 5 is maintained at a constant value, and during this period, the output of the function generator 12 is taken into consideration in consideration of surging. Of the signal and the output signal of the variable guide vane opening setting device 17, the high value signal is selected by the high value selection circuit 16 to correct the opening position of the variable guide blade 2.

However, in recent years, the development of large-capacity gas turbines has progressed, and along with the increase in output, the working gas sent to the turbine 5 has become hotter, and the amount of air taken in by the air compressor 1 has also been increased. Under such conditions, there is some concern about preventing the occurrence of surging by using the conventional blade opening calculation circuit 10. That is, the variable guide vane opening degree setter 17 incorporated in the blade opening degree calculation circuit 10 outputs only a constant value that is empirically determined in advance, so that the opening correction range of the variable guide vane 2 is reduced. Regardless of whether it is narrow and the range of temperature change of the atmosphere is relatively small, for example, when it becomes 0 ° C. like in winter, the flow velocity of the atmosphere passing through the air compressor 1 should be adjusted to an appropriate value according to this temperature change. However, there is a problem that the driver has to drive without being able to predict when surging will occur, and that he is always anxious.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a variable guide vane control device for a gas turbine, which does not cause surging and enables stable operation of the gas turbine. And

Another object of the present invention is to change the flow rate and temperature of the sucked air even if the sucked air in the air compressor is greatly increased and the temperature of the sucked air is drastically and drastically changed. (EN) Provided is a variable guide vane control device for a gas turbine, which can rapidly correct the opening of the variable guide vane by quickly following the above.

[0022]

In order to achieve the above object, a variable guide vane control device for a gas turbine according to a first aspect of the present invention provides a compressed air pressure signal from an air compressor and an exhaust gas temperature signal from a turbine. A blade opening calculation circuit that generates a blade opening signal based on the above, and an actual blade opening position detector that detects the actual opening of the variable guide blade of the air compressor are provided. In the variable guide vane control device of the gas turbine, the output signal from the actual blade opening position detector is matched with the output signal of, and the opening of the variable guide vane is corrected based on the deviation thereof. A temperature detector is provided on the inlet side of the air conditioner, and the air temperature change signal detected by the temperature detector is added to the compressed air signal and the exhaust gas temperature signal to calculate the blade opening correction signal. Calculation correction times Is provided, and the output signal from the actual blade opening position detector is matched with the blade opening signal generated based on the atmospheric temperature change by the blade opening calculation correction circuit, and based on the deviation, This is a modification of the opening of the variable guide vanes.

According to a second aspect of the present invention, the blade opening calculation correction circuit receives the atmospheric temperature change signal from the temperature detector and produces the opening signal of the variable guide vane, and the air compressor. And a second function generator for producing a turbine exhaust gas temperature converted value by receiving the compressed air pressure signal from the turbine, and calculating the output signal of the second function generator by adding the exhaust gas temperature signal from the turbine to the output signal. A high value selection circuit is provided which selects a high value signal from the signal and the output signal from the first function generator and gives it to the variable guide blade drive unit as a variable guide blade opening correction signal.

According to a third aspect of the present invention, a blade opening calculation circuit for generating a blade opening signal based on a compressed air pressure signal from the air compressor and an exhaust gas temperature signal from the turbine is provided, and the air compressor variable. Equipped with an actual blade opening position detector that detects the actual opening of the guide blade, the output signal from the blade opening calculation circuit is matched with the output signal from the actual blade opening position detector, and the deviation is detected. In a variable guide vane control device for a gas turbine that corrects the opening of the variable guide vane based on the above, a pipe for discharging compressed air from the discharge part of the compressor to the atmosphere is provided, and an air flow control valve is provided in this pipe. It was installed.

According to a fourth aspect of the present invention, in the variable guide vane control device for a gas turbine according to the third aspect, the air flow rate control valve is controlled by a compressor based on the atmospheric temperature, the gas turbine speed and the variable guide vane opening. The correction flow rate is calculated and the compressor pressure ratio determined by the compressor correction flow rate is used as a target value.

According to a fifth aspect of the present invention, in the variable guide vane control device for a gas turbine according to the fourth aspect, the control of the air flow control valve is performed based on a function of the atmospheric temperature and the variable guide vane opening. Is.

[0027]

The variable guide vane control device for a gas turbine according to the present invention is provided with a temperature detector for detecting a temperature change of the atmosphere unlike the conventional case, and the blade opening calculation correction circuit uses the detected atmospheric temperature change signal as a factor. It produces a blade opening correction signal for the variable guide vanes.

In the blade opening calculation / correction circuit in this case, the first function generator generates and outputs a blade opening correction signal while having a specific relationship between the atmospheric temperature change and the opening of the variable guide blade. As the output of the gas turbine increases, the intake air volume of the air compressor increases significantly, and even if the volume weight of this intake volume increases or decreases significantly due to changes in atmospheric temperature, it is possible to quickly follow that change. Thus, the variable guide vane can be corrected to an appropriate opening.

Therefore, since the variable guide vanes can be adjusted to the proper opening position under the change of atmospheric temperature, even if the volume weight of the atmospheric air sucked by the air compressor is excessive or insufficient, the surging can be surely prevented. You can

Further, according to the present invention, the internal pressure in the compressor is lowered by releasing a part of the compressed air to the atmosphere, the flow velocity of the air in the compressor blade is secured, and the surging does not occur. Safe driving becomes possible.

Further, according to the present invention, the internal pressure in the compressor is always set to the specified value even at an extremely low atmospheric temperature, the flow velocity of the air in the compressor blade is secured, and the safe operation without surging occurs. Is possible.

Further, according to the present invention, the internal pressure in the compressor is limited even at an extremely low atmospheric temperature, the flow velocity of the air in the compressor blade is secured, and safe operation without surging is possible. Become.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a variable guide vane control device for a gas turbine according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an example of a variable guide vane control device for a gas turbine according to the present invention.

The gas turbine is provided with an air compressor 1 directly connected to a turbine 5, and a fuel is added together with compressed air from the air compressor 1 to a working gas (combustion gas) by a combustor 4.
Are produced and the working gas is given to the turbine 5 to perform expansion work. In addition, the air compressor 1 has variable guide vanes 2
The variable guide vane 2 has its opening corrected by a blade opening calculation correction circuit 20.

The blade opening calculation correction circuit 20 incorporates a first function generator 22 and a second function generator 12.

The first function generator 22 receives the atmospheric temperature change signal from the temperature detector 21 provided at the inlet of the air compressor 1, and based on this atmospheric temperature change signal, the opening degree of the variable guide vane 2 is increased. A signal is produced and sent to the high price selection circuit 16.

The second function generator 12 receives the compressed air pressure signal from the pressure detector 11 provided on the outlet side of the air compressor 1, and the exhaust gas temperature converted value of the turbine 5 is calculated based on this compressed air pressure signal. Has been created. The output signal of the exhaust gas temperature conversion value produced by the second function generator 12 is sent to the subtraction unit 13, where it is matched with the actual exhaust gas temperature signal from the exhaust gas temperature detector 14 provided at the outlet of the turbine 5. After the subtraction, the calculation unit 15 performs a proportional / integral operation and sends it to the high price selection circuit 16.

The high value selection circuit 16 includes a first function generator 22.
Of the opening signal of the variable guide vanes 2 produced by the above and the operation signal of the exhaust gas temperature conversion value produced by the second function generator 12 for keeping the temperature of the working gas sent to the turbine 5 constant. Or a high value signal is selected and sent to the blade opening position control circuit 18, where the variable guide blade drive unit 2
When the deviation is caused by matching the actual variable guide vane opening position from the detector 19 of “a”, the deviation is given to the variable guide blade 2a to correct the opening position of the variable guide blade 2.

As described above, in the blade opening calculation correction circuit 20 according to the present invention, the opening of the variable guide vane 2 is corrected using the temperature change of the air sucked from the air compressor 1 as a factor, so that the air compression The machine 1 can suck in an appropriate amount of air corresponding to the temperature of the atmosphere, and under such an appropriate amount of intake of the atmosphere, there is no change in the flow velocity of the fluid passing through the air compressor, thus preventing surging. can do.

Next, a compressor protection device in the variable guide vane control device for a gas turbine according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, a part of the high-pressure air compressed by the compressor 1 is discharged from the discharge stop valve 21 and the discharge air by the discharge pipe 20 connected to the extraction part or the discharge part of the compressor 1. It is released into the exhaust gas of the gas turbine 5 via the flow rate control valve 23. The discharge destination may be the atmosphere or the suction part of the compressor 1.

FIG. 3 shows an example of the gas turbine compressor protection device in detail.

Atmospheric temperature detector 32 provided at the inlet of compressor 1, rotational speed detector 31 provided at the rotary shaft of compressor 1, and variable guide vane position detector provided at variable guide vane 2. The signal of 19 is input to the calculator 33 in the gas turbine compressor protection device 30. The calculator 33 calculates the compressor corrected flow rate and outputs the result to the function generator 34.

The function generator 34 has a relational expression of the compressor correction flow rate and the compressor pressure ratio setting, and the compressor pressure ratio setting is also small when the compressor correction flow rate is small. These relational expressions will be described later.

The compressor pressure ratio setting from the function generator 34 is output to the subtractor 35. Further, the compressor inlet pressure signal from the pressure detector 36 provided at the inlet of the compressor 1 and the compressor discharge pressure signal from the pressure detector 11 provided at the outlet of the compressor 1 are gas. It is input to the divider 37 in the turbine compressor protection device 30.

The divider 37 calculates the actual compressor pressure ratio signal by dividing the compressor discharge pressure signal by the compressor inlet pressure signal, and outputs the result to the subtractor 35. The subtractor 35 calculates the difference between the compressor pressure ratio setting signal from the function generator 34 and the actual compressor pressure ratio signal from the divider 37, and outputs the resulting deviation signal to the controller 38. Controller 38
Has a proportional and integral element, and the output of the controller 38 controls the opening degree of the discharge air flow rate control valve 22 so that the deviation signal from the subtractor 35 becomes zero.

With this gas turbine compressor protection device 30, even if the opening of the variable guide vanes 2 becomes small and the compressor flow rate decreases at extremely low atmospheric temperatures, the compressor pressure ratio will always be the specified value, and the sircing will be performed. Does not occur and safe driving is always possible.

The relational expressions of the gas turbine compressor umbilicus device 30 described above will be described in detail below.

That is, the corrected flow rate calculator 33 in the gas turbine compressor protection device 30 shown in FIG. 3 is a calculator having the following functions.

Based on the gas turbine air compressor speed signal from the rotation speed detector 31 and the atmospheric temperature signal from the temperature detector 32, the air compressor correction speed Nc is calculated by the following equation.

[0052]

[Equation 1]

Next, based on the air compressor correction speed Nc calculated by the above equation, the air compressor correction flow rate Gc is calculated using the function generator having the characteristic shown in FIG. In FIG.
As the air compressor correction speed (correction rotation speed) Nc increases, the air compressor correction flow rate Gc increases. However,
The illustrated function shows the efficiency of the air compressor, and shows the case where the air suction cross-sectional area of the air compressor is constant.

Next, based on the inlet guide vane opening signal from the position detector 19, the function generator having the characteristic shown in FIG. 5 is used to calculate the correction coefficient of the air suction cross-sectional area of the air compressor. That is, since the air compressor correction flow rate calculated by the function generator having the characteristics shown in FIG. 4 is the flow rate when the opening of the inlet guide vanes is fully open, in order to obtain the flow rate in the actual operating state, It is necessary to make a correction based on the opening of the inlet guide vanes.

Summarizing the above calculations, the corrected flow rate calculator 33 of FIG. 3 has the configuration shown in FIG.

The theoretical basis of the above operation will be described below. Volume weight G is the product of flow rate Q and specific weight γ,

[Equation 2] Becomes Here, the specific weight γ is a function of temperature γ = γ (T),
The specific weight γ decreases as the temperature increases. That is,

(Equation 3) Is inversely proportional to.

Therefore, when the atmospheric temperature rises, the specific weight γ decreases, so even if the suction flow rate Q is constant, the volume weight G is

[Equation 4] become.

Therefore, G is affected by the high atmospheric temperature.
Becomes smaller, the rotational speed N needs to be corrected at the reduced G, and Nc needs to be corrected according to the above equation. By design, the atmospheric temperature is set to 15 ° C., and the specific weight γ at that temperature determines the volume weight G.

FIG. 7 shows another configuration example of the gas turbine compressor protection device.

The temperature signal from the atmospheric temperature detector 36 provided at the inlet of the compressor 1 and the variable guide vane opening signal from the variable guide vane position detector 19 provided at the variable guide vane 2 are the gas turbine compressor. It is input to the function generator 41 in the protection device 40.

This function generator 41 has a relational expression between the atmospheric temperature and the discharge air flow rate of the compressor 1 at the variable guide vane opening. When the atmospheric temperature is low, the discharge air flow rate of the compressor 1 is generated. The higher the opening degree of the variable guide vane 2, the larger the discharge air flow rate thereof. This function generator 4
The compressor discharge air flow rate from 1 is the discharge air flow rate control valve 2
Since it can be treated as equivalent to the valve opening degree setting of 2, the output of the function generator 41 determines the opening degree of the discharge air flow rate control valve 22.

The gas turbine compressor protection device 40 ensures the air flow velocity in the compressor blades, and enables safe operation without the occurrence of surging.

[0063]

As described above, the variable guide vane control device for a gas turbine according to the present invention produces the blade opening signal of the variable guide vane by using the temperature change of the atmosphere sucked by the air compressor as a factor. An exhaust gas temperature converted value of the turbine is created based on the compressed air pressure from the air compressor, and the actual exhaust gas temperature of the turbine is further added to the calculated exhaust gas temperature converted value to calculate the calculated signal and the blade opening signal.
The air compressor is equipped with a blade opening calculation correction circuit that selects a high value signal and gives a blade opening correction signal to the variable guide blades. Can inhale. Therefore, the air compressor has an effect that the flow velocity can be made substantially constant and the surging can be prevented while ensuring a sufficient volumetric weight of the atmosphere even if the atmospheric temperature changes.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a variable guide vane control device for a gas turbine according to the present invention.

FIG. 2 is a diagram showing a compressor protection device in the variable guide vane control device.

FIG. 3 is a diagram showing the compressor protection device in detail.

FIG. 4 is a characteristic diagram showing a correction function of a function generator in the compressor protection device.

FIG. 5 is a characteristic diagram showing a function of a position detector in the compressor protection device.

FIG. 6 is a functional configuration diagram of a modified flow rate calculator in the compressor protection device.

FIG. 7 is a diagram showing another configuration example of the compressor protection device.

FIG. 8 is a schematic diagram of a conventional typical gas turbine.

FIG. 9 is a block diagram of a conventional variable guide vane control device for a gas turbine.

FIG. 10 is a graph showing the relationship between the variable guide vane opening and the gas turbine output.

FIG. 11 is a graph showing the relationship between the variable guide vane opening and the atmospheric temperature.

FIG. 12 is a view showing the behavior of air indicating that surging has occurred on the blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air compressor 2 Variable guide vanes 2a Variable guide vane drive unit 3 Blade 4 Combustor 5 Turbine 11 Pressure detector 12 Second function generator 13 Subtraction unit 14 Exhaust gas temperature detector 15 Calculation unit 16 High value selection circuit 18 Blade opening Position control circuit 19 Detector 20 Blade opening calculation correction circuit 21 Temperature detector 22 First function generator 23 Discharged air flow control valve 30 Gas turbine compressor protection device 31 Rotation speed detector 32 Atmospheric temperature detector 33 Calculator 34 Function generator 35 Subtractor 36 Pressure detector 37 Divider 38 Controller 47 Gas turbine compressor protection device 41 Function generator

Claims (5)

[Claims] 1. A blade opening calculation circuit for generating a blade opening signal based on a compressed air pressure signal from an air compressor and an exhaust gas temperature signal from a turbine, and actual opening of a variable guide blade of the air compressor. Equipped with an actual blade opening position detector for detecting the degree of deviation, the output signal from the actual blade opening position detection circuit is matched with the output signal from the actual blade opening position detector, and the variable guide is provided based on the deviation. In a variable guide vane control device of a gas turbine that corrects the opening of the blade, a temperature detector is provided on the inlet side of the air compressor, and an atmospheric temperature change signal detected from this temperature detector is used as the compressed air signal. A blade opening calculation correction circuit for adding the above exhaust gas temperature signal for calculation to generate a blade opening correction signal is provided. The blade opening signal created by this blade opening calculation correction circuit based on the change in atmospheric temperature. To the above A variable guide vane control device for a gas turbine, characterized in that the output signals from the blade opening position detectors are matched and the opening of the variable guide vane is corrected based on the deviation. 2. A blade opening calculation and correction circuit receives a first function generator which receives an atmospheric temperature change signal from a temperature detector and produces an opening signal of a variable guide blade, and a compressed air pressure signal from an air compressor. A second function generator that receives the exhaust gas temperature converted value of the turbine is provided, while the output signal of the second function generator is added with the exhaust gas temperature signal from the turbine for calculation, and the calculated signal and the first signal 2. The variable guide for a gas turbine according to claim 1, further comprising a high value selection circuit that selects one of the high value signals from the output signals from the function generator and provides the variable guide blade drive unit with the high value selection signal as an opening correction signal for the variable guide blade. Wing control device. 3. A blade opening calculation circuit for producing a blade opening signal based on a compressed air pressure signal from an air compressor and an exhaust gas temperature signal from a turbine, and actual opening of a variable guide blade of the air compressor. Equipped with an actual blade opening position detector for detecting the degree of deviation, the output signal from the actual blade opening position detection circuit is matched with the output signal from the actual blade opening position detector, and the variable guide is provided based on the deviation. In a variable guide vane control device for a gas turbine that corrects the opening of the blade, a pipe for releasing compressed air from the discharge portion of the compressor to the atmosphere is provided,
A variable guide vane control device for a gas turbine, wherein an air flow control valve is installed in this pipe. 4. The control of the air flow rate control valve is performed by calculating a compressor correction flow rate based on an atmospheric temperature, a gas turbine speed and a variable guide vane opening, and a compressor pressure ratio determined by the compressor correction flow rate as a target value. The variable guide vane control device for a gas turbine according to claim 3, which is performed. 5. The variable guide vane control device for a gas turbine according to claim 3, wherein the control of the air flow control valve is performed based on a function of the atmospheric temperature and the variable guide vane opening.