JP4796015B2 - Gas turbine operation control device and operation control method - Google Patents

Description

  The present invention relates to an operation control device and an operation control method for a gas turbine.

  In general, a gas turbine used in a power plant or the like injects fuel into air compressed in a compressor and burns it, and guides the resulting high-temperature and high-pressure combustion gas to the turbine to extract the output. FIG. 7 shows a basic configuration of this gas turbine. The gas turbine 100 includes a compressor 102, a combustor 103, and a turbine 101, and a combustor is connected via a fuel flow rate adjustment valve 105 in which air compressed by the compressor 102 is activated by a control signal from a control unit 110. Combusted by being mixed with the fuel supplied to 103, becomes high-temperature combustion gas, and expands in the turbine 101. The fuel flow rate adjusting valve 105 adjusts the load required by controlling the fuel flow rate. In the turbine 101, the compressor 102 is driven, and the load such as the generator 150 is driven by the remaining output. Furthermore, in the case of a single-shaft combined cycle power plant, the rotating shafts of the gas turbine 100, the generator 150, and the steam turbine 160 are coupled together.

Further, an inlet guide vane (Inlet) is provided on the front side of the first stage blade of the compressor 102.
Guide Vane (IGV) 104 is provided. This inlet guide vane 104 changes the amount of air flowing between the moving blades of the compressor 102 and flowing into the combustor 103 by manipulating the opening degree of each stationary vane, and the exhaust gas temperature of the gas turbine 100 is changed. This is for controlling the target value. The intake air is given a circumferential speed by the inlet guide vanes 104 and introduced into the compressor 102. In the compressor 102, energy is given to the introduced air through multistage moving blades and stationary blades, and the pressure rises. The inlet guide vanes 104 are configured such that a large number of movable vanes provided in the circumferential direction are movably supported, and an actuator is actuated by a drive signal from the control unit 110 to move these movable vanes. The intake flow rate and combustion temperature are adjusted.

  More specifically, the control unit 110 has a configuration as shown in FIG. 8 in order to generate an IGV opening command 115 to the actuator of the inlet guide vane 104. That is, the configuration includes a multiplier 11, a table function unit (FX1) 12, a limiter 13, a correction function unit (FX2) 14, and a limit function unit (FX3) 15. Basically, the IGV opening is set according to the function shown in FIG. 9A according to the generator output (GT output), but as shown in FIG. 9B by the correction function unit (FX2) 14. The GT output correction coefficient K2 is generated based on the relationship corresponding to the compressor inlet temperature, and the multiplier 11 multiplies the GT output by the correction coefficient K2, thereby correcting the GT output value referring to the table function. Yes. Further, the limit function unit (FX3) 15 generates the IGV maximum opening M1 based on the relationship corresponding to the compressor inlet temperature as shown in FIG. 9C, and the limiter 13 generates the table function unit (FX1) 12. Is limited so that the IGV opening generated in step S1 does not exceed the IGV maximum opening M1.

As prior arts for controlling the inlet guide vanes 104 of the gas turbine 100 as described above, for example, Japanese Patent Application Laid-Open No. 2003-206749 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2001-200730 (Patent Document 2) are known. Yes. In Patent Document 1, when the opening range of the IGV is low, the intake flow rate changes greatly with a slight opening change, and when the opening range of the IGV is high, the intake flow rate changes almost with a small opening change. In this way, the intake flow rate varies greatly depending on the opening range, but even if the intake flow rate varies greatly depending on the opening range, an operation method that can ensure a predetermined intake flow rate for the output is shown. ing. Further, Patent Document 2 discloses that the amount of air sucked into the air compressor using the air compressor inlet temperature as an input when the actual output of the gas turbine has a margin with respect to the planned output value or during partial load operation. The driving | running method which controls the opening degree upper limit of IGV which controls IGV is shown.
JP 2003-206749 A JP 2001-200730 A

  Recently, as a Grid Code (system operation rule) in the European region, load followability to system frequency fluctuations has been required up to 100% load, and there is a similar movement in Japan. In the prior art, the gas turbine 100 increases the fuel in response to the load increase according to the settling rate when the frequency decreases at high load in the governor-free operation, or in response to the load increase command. Since the temperature control operation is performed from the viewpoint of equipment protection such as equipment damage due to an increase in (turbine inlet temperature), there is a concern that a desired load cannot be obtained.

  That is, with respect to the decrease in the system frequency as shown in FIG. 10A, the conventional technique does not perform the opening degree control of the inlet guide vanes 104 of the gas turbine 100 (see FIG. 10B), but by the fuel control. In order to satisfy the Grid Code request response for the shaft output as shown in FIG. 10C, the overshoot limit value for the turbine inlet temperature is set as shown in FIG. There was also the possibility of exceeding the limitations of equipment protection.

  On the other hand, if the turbine inlet temperature overshoot is not allowed from the viewpoint of equipment protection, the Grid Code request response for the shaft output shown in FIG. 10C may not be satisfied. In particular, in the case of a single-shaft combined cycle power plant in which the gas turbine 100 and the steam turbine 160 are coaxial, as shown in FIG. 10D, the increase in the output (ST output) of the steam turbine 160 is delayed. In order to satisfy the shaft output specified by Code, it is necessary to compensate for the shortage of the output of the steam turbine 160 by the overload operation of the gas turbine 100.

The present invention has been made in view of the above problems, and is capable of suppressing the turbine inlet temperature within the overshoot limit range with respect to frequency fluctuations, and is also capable of reducing the shaft output with respect to the grid.
An object of the present invention is to provide a gas turbine operation control apparatus and operation control method capable of satisfying the Code request response.

In order to solve the above problems, the present invention employs the following means.
The present invention relates to an operation of a gas turbine that supplies compressed air and fuel from a compressor having an inlet guide vane in a preceding stage to a combustor and rotates the turbine by combustion gas generated in the combustor to drive a generator. An inlet guide vane that is a control device and sets an opening degree of the inlet guide vane from a detection value of the generator output based on a preset relationship between the opening degree of the inlet guide vane and the output of the generator An opening setting means; and a first correction means for calculating a first opening correction amount of the inlet guide vane according to the frequency fluctuation amount for a frequency fluctuation exceeding a certain amount, and the inlet guide vane Provided is a gas turbine operation control device for controlling the inlet guide vane based on an opening obtained by adding the opening set by the opening setting means and the first opening correction amount calculated by the first correction means. To do.

According to the present invention, for example, when the system frequency is lowered, the first opening correction amount of the inlet guide vane according to the frequency fluctuation is set and the inlet guide vane is controlled to be opened. It can be controlled within the overshoot limit range, and the axis output can
It is possible to satisfy the Code request response.

In the gas turbine operation control device of the present invention, first that calculates a load change of the gas turbine from the output of the generator issues calculate the second opening correction amount of the inlet guide vanes in response to the load variation 2 correction means, the opening set by the inlet guide blade opening setting means, the first opening correction amount calculated by the first correction means, and the second opening calculated by the second correction means. The inlet guide vanes may be controlled based on the opening degree obtained by adding the degree correction amount .

  According to the present invention, for example, even when a load change such as a load increase command is performed, the second opening degree correction amount of the inlet guide blade is set according to the load change amount, and the inlet guide blade is controlled to open. The exhaust gas temperature can be kept low.

In the operation control apparatus for a gas turbine according to the present invention, at least one time change rate of the first opening correction amount of the first correction unit and the second opening correction amount of the second correction unit is an inlet temperature of the turbine. It is good also as having a rate-of-change restriction | limiting means to restrict | limit so that it may become below the predetermined value determined from restrictions.

  According to the present invention, finer control is possible, and it is possible to prevent the turbine inlet temperature from rising above the limit value so as not to be rapidly returned when switching back to the rated opening.

In the gas turbine operation control apparatus according to the present invention, a predetermined range of the generator output corresponding to a range from a medium load to a high load is preset, and at least one of the first correction unit and the second correction unit may be the output of the generator is operated when in the predetermined range.

  According to the present invention, finer control is possible.

In the operation control apparatus for a gas turbine according to the present invention, a predetermined range of the inlet temperature of the turbine corresponding to a range from a medium load to a high load is set in advance, and at least one of the first correction unit and the second correction unit One may be a possible inlet temperature of the turbine is operated when in the predetermined range.

  According to the present invention, for example, the operation of fully opening the inlet guide vane at the point where the turbine inlet temperature is the severest is possible, and finer control is possible.

In the gas turbine operation control device of the present invention, the predetermined range of the blade path temperature corresponding to a range of high load from middle load and is set in advance, at least the first correcting means and before Symbol second correcting means one may be the blade path temperature is activated when in the predetermined range.

  According to the present invention, for example, the operation of fully opening the inlet guide vane at the point where the turbine inlet temperature is the severest is possible, and finer control is possible.

The present invention relates to an operation of a gas turbine that supplies compressed air and fuel from a compressor having an inlet guide vane in a preceding stage to a combustor and rotates the turbine by combustion gas generated in the combustor to drive a generator. A control method, the first step of setting the opening of the inlet guide vane from the detected value of the generator output based on a preset relationship of the opening of the inlet guide vane with respect to the output of the generator And a second step of calculating a first opening correction amount of the inlet guide blade according to the frequency fluctuation amount for frequency fluctuations exceeding a certain amount, and the opening degree set in the first step And a gas turbine operation control method for controlling the inlet guide vanes based on an opening obtained by adding the first opening correction amount calculated in the second step .

According to the present invention, the first opening correction amount of the inlet guide vane according to the frequency variation is set, and for example, control is performed so that the inlet guide vane is opened when the frequency decreases. In addition to being able to keep within the range, the grid output is also increased by increasing the air volume.
The code request response can be satisfied.

  Hereinafter, embodiments of an operation control device and an operation control method for a gas turbine according to the present invention will be described with reference to the drawings.

[First Embodiment]
A gas turbine operation control apparatus and operation control method according to a first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a block diagram of the operation control apparatus for a gas turbine according to the first embodiment. In the figure, the same reference numerals are given to the portions overlapping with FIG. 7 (conventional example). FIG. 2 is a specific configuration diagram of the IGV control unit 113 according to the first embodiment, and FIG. 3 is an explanatory diagram for explaining functions of various function units and operation range setting units of the IGV control unit 113. FIG. 4 is a time chart of various amounts when the system frequency is lowered in the first embodiment.

  In FIG. 1, in the gas turbine operation control apparatus of the present embodiment, a gas turbine 100 includes a compressor 102, a combustor 103, and a turbine 101, and the air compressed by the compressor 102 is a fuel control unit of the control unit 111. The fuel is mixed with the fuel supplied to the combustor 103 via the fuel flow rate adjusting valve 105 operated by the control signal 116 from the engine 112 and burned, and becomes a high-temperature combustion gas and expands in the turbine 101. The fuel flow rate adjusting valve 105 adjusts the load required by controlling the fuel flow rate, and further the exhaust gas temperature. In the turbine 101, the compressor 102 is driven, and the load of the generator 150 is driven by the remaining output. Furthermore, in the case of a single-shaft combined cycle power plant, the rotating shafts of the gas turbine 100, the generator 150, and the steam turbine 160 are coupled together.

  Further, an inlet guide vane (IGV) 104 is provided on the front side of the first stage blade of the compressor 102. The intake air is given a circumferential speed by the inlet guide vanes 104 and introduced into the compressor 102. In the compressor 102, the air introduced through the multistage moving blades and stationary blades is given energy, and the pressure rises. In addition, the inlet guide vane 104 is configured such that a large number of movable vanes provided in the circumferential direction are rotatably supported, and the inlet guide vane 104 is controlled by an IGV opening command 117 from the IGV control unit 113 of the control unit 111. These actuators are actuated to move these movable blades to adjust the intake air flow rate and the combustion temperature.

  A blade path temperature detector 123 that detects the temperature of the gas that has passed through the blades of the final stage is provided at the final stage of the turbine 101, and is disposed in the exhaust passage downstream of the position where the blade path temperature detector 123 is disposed. Is provided with an exhaust gas temperature detector 124 for detecting the temperature of the exhaust gas. In addition, an intake air condition detector 121 that detects the intake air condition is provided to detect the intake air temperature and the intake air pressure. The pressure in the passenger compartment of the combustor 103 is detected by the passenger compartment pressure sensor 122. Furthermore, a generator output sensor (not shown) is provided to detect the load state of the turbine 101.

  Then, detection signals detected by the blade path temperature detector 123, the exhaust gas temperature detector 124, the intake state detector 121, the vehicle interior pressure sensor 122, and the generator output sensor are input to the control unit 111. The control unit 111 includes a fuel control unit 112 that controls fuel supply and an IGV control unit 113 that controls the opening degree of the inlet guide vanes 104. The IGV control unit 113 is configured as shown in FIG.

  In FIG. 2, the IGV control unit 113 sets the opening of the inlet guide vane 104 from the detected value of the generator output sensor based on the preset relationship between the opening of the inlet guide vane 104 and the output of the generator 150. A guide blade opening setting unit (inlet guide blade opening setting means) 10 calculates a first opening correction amount of the inlet guide blade 104 according to the frequency fluctuation amount for a frequency fluctuation exceeding a certain amount, A first correction unit (first correction means) 20 that corrects the opening set by the inlet guide blade opening setting unit 10, and an output of the generator 150 (output of the generator output sensor) or a target value of the generator output The change in load of the gas turbine is calculated from the generator output setting value set from the above, the second opening correction amount of the inlet guide blade 104 corresponding to the load change amount is calculated, and the inlet guide blade opening setting unit 10 Correct the set opening It is composed 2 correcting unit and a (second correction means) 30.

  In addition, the 1st correction | amendment part 20 and the 2nd correction | amendment part 30 are the case where the generator output setting value set from the output of the generator 150 (output of a generator output sensor) or the target value of a generator output exists in a predetermined range. It is the structure which operates to.

  Then, the IGV control unit 113 sets the opening setting value of the inlet guide vane 104 set by the inlet guide vane opening setting unit 10 and corrected by the first correction unit 24 and the second correction unit 26 to the IGV opening command 117. To the actuator of the inlet guide vane 104.

  The inlet guide blade opening degree setting unit 10 is configured in the conventional control unit 110, that is, a multiplier 11, a table function unit (FX1) 12, a limiter 13, a correction function unit (FX2) 14, and a limit function unit (FX3) 15. Is added to the configuration provided with an adder 16 for correcting the IGV opening set by these components by the first opening correction amount and the second opening correction amount.

  The inlet guide vane opening setting unit 10 basically sets the IGV opening according to the function shown in FIG. 9A according to the output of the generator 150 (GT output; output of the generator output sensor). To do. However, the correction function unit (FX2) 14 generates the GT output correction coefficient K2 based on the relationship corresponding to the compressor inlet temperature (the outside air temperature detected by the intake air condition detector 121) as shown in FIG. 9B. Then, the multiplier 11 multiplies the GT output by the correction coefficient K2, thereby correcting the GT output value referring to the table function.

  Further, the limit function unit (FX3) 15 generates the IGV maximum opening M1 based on the relationship corresponding to the compressor inlet temperature as shown in FIG. 9C, and the limiter 13 generates the table function unit (FX1). The IGV opening generated at 12 is limited so as not to exceed the IGV maximum opening M1.

The first correction unit 20 includes a first opening correction function unit (FX4) 21, a first correction unit operation range setting unit (FX5) 23, a multiplier 22, and an adder 24.
In the 1st correction | amendment part 20, basically according to the function as shown to Fig.3 (a) according to the frequency variation | change_quantity (DELTA) f of a system | strain frequency by the 1st opening degree correction function unit (FX4) 21, A first opening correction amount CP11 is set.

  In FIG. 3A, the dead zone is provided because the system frequency fluctuates by about ± several Hz during operation, and the first correction unit 20 does not substantially act on such fluctuation noise. It is for doing so. A negative value in the direction of opening the inlet guide vane 104 (decreasing the IGV opening) is set for a decrease in the system frequency, and the inlet guide vane 104 is closed (an IGV opening is set for an increase in the system frequency). A positive value is set for the (up) direction.

Here, the frequency fluctuation is assumed to be during governor-free operation, which is generally performed as a frequency control method for short-period fluctuations, and a first greater than a predetermined amount for a relatively large frequency fluctuation greater than a certain amount. There is a limit so that the opening correction amount is not reached.
Further, in order to set the operating range of the first correction unit 20 to a range in which the load of the gas turbine is medium to high, the output of the generator 150 (output of the generator output sensor) is set by the first correction unit operating range setting unit (FX5) 23. ) Or the generator output set value set from the generator output target value, the operating range coefficient K5 having the relationship shown in FIG. 3B is generated, and the multiplier 22 corrects the first opening degree. A value obtained by multiplying the amount CP11 by the operating range coefficient K5 is defined as a first opening correction amount CP1 generated by the first correction unit 20.

The second correction unit 30 includes first-order lag filters 31 and 32, a subtractor 33, a second opening correction function unit (FX6) 34, a second correction unit operation range setting unit (FX7) 35, and a multiplier 36. This is a configuration provided.
In the second correction unit 30, first, a signal obtained by delaying the generator output set value set from the output of the generator 150 (output of the generator output sensor) or the target value of the generator output by the primary delay filters 31 and 32. Is obtained by a subtractor 33, and this is obtained as a load change (pseudo differential value) of the gas turbine. Then, in the second opening correction function unit (FX6) 34, the second IGV opening is set according to the function shown in FIG. 3C in accordance with the load change of the gas turbine (the pseudo differential value of the GT output). An opening correction amount CP21 is set. The second opening correction amount CP21 can be arbitrarily adjusted by the function FX6 of the second opening correction function unit 34. For example, the second opening correction amount CP21 can be adjusted only when the pseudo-differential value is positive, such as when the load is increased. An opening correction amount CP21 is output, and when the pseudo differential value is negative, such as a load reduction, it can be set not to be corrected to zero.

  Further, in order to set the operation range of the second correction unit 30 to a range in which the load of the gas turbine is a medium to high load, the output of the generator 150 (the output of the generator output sensor) is output by the second correction unit operation range setting unit (FX7) 35. ) Or the generator output set value set from the generator output target value, the operating range coefficient K7 having the relationship shown in FIG. 3D is generated, and the multiplier 36 corrects the second opening. A value obtained by multiplying the amount CP21 by the operating range coefficient K7 is a second opening degree correction amount generated by the second correction unit 30.

  Then, the adder 20 of the first correction unit 20 adds the first opening correction amount CP1 generated by the first correction unit 20 and the second opening correction amount generated by the second correction unit 30. An IGV addition amount CP0 is obtained, and the adder 16 of the inlet guide blade opening degree setting unit 10 adds the IGV addition amount CP0 to the IGV opening amount set by the inlet guide blade opening degree setting unit 10 to give an IGV opening command. 117 is obtained.

Next, with reference to FIG. 4, the operation control by the operation control apparatus of the gas turbine of this embodiment is demonstrated. Here, as shown in FIG. 4A, a case where the system frequency is lowered by Δf will be described as an example.
In response to such frequency fluctuations, the control unit 111 (IGV control unit 113) uses the first opening correction function device (FX4) 21 of the first correction unit 20 to perform IGV corresponding to the frequency fluctuation amount Δf of the system frequency. When the first opening correction amount CP11 (negative value) of the opening is set and the load of the gas turbine is high, the first opening correction amount CP11 is output almost as it is as the first opening correction amount CP1. . That is, as the IGV opening command 117, the IGV opening corrected to be lower by the first opening correction amount CP1 is given to the actuator of the inlet guide vane 104. The opening of the inlet guide vane 104 is shown in FIG. Thus, it will change in the direction opened only 1st opening amount correction amount CP1.

  Generally, since the turbine inlet temperature is proportional to the fuel-air ratio (fuel amount / combustion air amount ratio), if the IGV opening is changed in the direction in which the inlet guide vanes 104 open, the intake air flow rate of the compressor 102 increases. As the amount of combustion air increases, the fuel-air ratio, that is, the turbine inlet temperature decreases. On the other hand, there is a relationship of “turbine output = turbine passage flow rate × turbine heat drop × efficiency”, and if the IGV opening is changed in the direction in which the inlet guide vanes 104 open, the intake air flow rate of the compressor 102 increases and the turbine Since the passage flow rate also increases, the output of the generator 150 will increase if the increase in the turbine passage flow rate contributes more than the heat drop due to the turbine inlet temperature drop.

Therefore, the turbine inlet temperature can be suppressed within the overshoot limit range as shown in FIG. 4E, and the grid code request response can be satisfied for the shaft output as shown in FIG. 4C. In particular, in the case of a single-shaft combined cycle power plant in which the gas turbine 100 and the steam turbine 160 are coaxial, the increase in the output (ST output) of the steam turbine 160 is delayed.
In order to satisfy the shaft output specified by Code, it is necessary to compensate for the shortage of output of the steam turbine 160 by the overload operation of the gas turbine 100.

  Further, a load change such as a load increase command is dealt with by the second correction unit 30 of the control unit 111 (IGV control unit 113). That is, only the opening setting of the inlet guide vane 104 with respect to the preset gas turbine output is a static opening setting, and when the load change increases, the opening setting tends to be delayed. By adding a transient plus alpha to the IGV opening set value using the second opening correction amount according to the load change amount, the exhaust guide temperature is controlled to open in the direction of opening the load to lower the exhaust gas temperature. Can be suppressed. Further, as the load change converges, the applied opening is gradually decreased, and when the load change amount is zero, the opening is returned to a state in which no correction is applied. In addition, although the load change amount was demonstrated about the raise change of a load, you may calculate and use a load change rate. The same applies to other embodiments.

  As described above, according to the operation control device and the operation control method for a gas turbine according to the present embodiment, the inlet guide blade opening degree setting unit 10 of the IGV control unit 113 sets the output of the generator 150 set in advance. The opening degree of the inlet guide vane 104 is set from the detected value of the generator output sensor based on the relationship of the opening degree of the inlet guide vane 104, and the frequency fluctuation is detected by the first correction unit 20 with respect to the frequency fluctuation exceeding a certain amount. The first opening correction amount of the inlet guide blade 104 corresponding to the amount is calculated, the opening set by the inlet guide blade opening setting unit 10 is corrected, and the output of the generator 150 ( The output change of the gas turbine is calculated from the output of the generator output sensor) or the generator output set value set from the target value of the generator output, and the second opening degree correction of the inlet guide vane 104 according to the load change amount Calculate quantity And, and it corrects the opening degree set by the inlet guide vane opening setting unit 10.

  Thereby, for example, when the system frequency is lowered, the first opening degree correction amount of the inlet guide blade 104 corresponding to the frequency fluctuation amount Δf is set, and the inlet guide blade 104 is controlled to be opened. Can be kept within the overshoot limit range, and the increase in air volume can satisfy the Grid Code request response for the shaft output. Further, for example, even when a load change such as a load increase command is performed, the second opening degree correction amount of the inlet guide vane 104 is set in accordance with the load change amount and the inlet guide vane 104 is controlled to be opened. The temperature can be kept low.

  Further, according to the operation control device and the operation control method for the gas turbine according to the present embodiment, the first correction unit 20 and the second correction unit 30 are operated when the output of the generator 150 is within a predetermined range. ing. Since the turbine inlet temperature exceeds the overshoot limit value when the load of the gas turbine is in the range of medium to high load and there is frequency fluctuation or load change, the gas turbine is based on the output of the generator 150. If the load is corrected only when the load is in the middle-high load range, finer control becomes possible.

[Second Embodiment]
Next, a gas turbine operation control apparatus and operation control method according to a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 5 is a specific configuration diagram of the IGV control unit 113 in the second embodiment, and FIG. 6 is a time chart of various amounts when the system frequency is lowered in the second embodiment.

  In the present embodiment, the time change rate of the first opening correction amount of the first correction unit 20 and the second opening correction amount of the second correction unit 30 is a predetermined value compared to the configuration of the first embodiment. It is characterized in that a change rate limiting unit 41 that limits the following is added, and the overall configuration of the operation control device of the gas turbine is the same as that of the first embodiment (FIG. 1). Is omitted. Also, with regard to the specific configuration of the IGV control unit 113, the same components as those in the first embodiment (FIG. 3) are denoted by the same reference numerals in FIG.

In FIG. 5, the IGV control unit 113 includes an inlet guide blade opening degree setting unit 10, a first correction unit 40, and a second correction unit 30, and the first correction unit 40 includes a first correction unit 40. A change rate limiting unit 41 is added to limit the rate of time change of the IGV addition amount (CP0) that is the result of adding the first opening correction amount of the correction unit 20 and the second opening correction amount of the second correction unit 30. Yes.
The rate-of-change limiting unit 41 has a rate of change between a direction in which the inlet guide vane 104 is opened (time change in the correction amount is negative) and a direction in which the inlet guide vane 104 is closed (time change in the correction amount is positive). The limit value can be set independently. Thereby, the speed which opens the entrance guide blade 104 and the speed at the time of switching back can be adjusted independently.

  Further, in FIG. 5, the change rate limiting unit 41 is installed between the adder 24 and the adder 16, and the time change of the IGV addition amount, which is the addition result of the first opening correction amount and the second opening correction amount. Although the rate is limited, between the multiplier 22 and the adder 24 of the first correction unit 40 and between the multiplier 36 of the second correction unit 30 and the adder 24 of the first correction unit 40. Each may be installed, and the time change rates of the first opening correction amount and the second opening correction amount may be individually limited.

  Next, with reference to FIG. 6, the operation control by the operation control apparatus of the gas turbine of this embodiment is demonstrated. As in the first embodiment, a case where the system frequency as shown in FIG. 6A is decreased by Δf will be described as an example.

  In response to such frequency fluctuations, the control unit 111 (IGV control unit 113) uses the first opening correction function device (FX4) 21 of the first correction unit 40 to perform the IGV corresponding to the frequency fluctuation amount Δf of the system frequency. When the first opening correction amount CP11 (negative value) of the opening is set and the load of the gas turbine is high, the first opening correction amount CP11 is output almost as it is as the first opening correction amount CP1. . That is, as the IGV opening command 117, the IGV opening corrected to be lower by the first opening correction amount CP1 is given to the actuator of the inlet guide vane 104, and the opening of the inlet guide vane 104 is shown in FIG. Thus, it will change in the direction opened only 1st opening amount correction amount CP1.

  Thereafter, when the inlet guide vanes 104 are further opened back, if the inlet guide vanes 104 are returned at the same speed as when the inlet guide vanes 104 are further opened, the turbine inlet temperature rises above the limit due to a mismatch with the fuel flow rate or the like. there is a possibility. In the present embodiment, the change rate limiting unit 41 closes the inlet guide vane 104 in the direction in which the inlet guide vane 104 is opened rather than limiting the time change rate in the direction in which the inlet guide vane 104 is opened (minus the time change in the correction amount). When the time change is positive), the time change rate limit is set strictly, so that the turbine inlet temperature does not rise above the limit value so that it does not suddenly return to the rated opening. is doing.

[Third Embodiment]
Next, an operation control apparatus for a gas turbine according to a third embodiment of the present invention will be described. In the first embodiment, the operation range of the first correction unit 20 and the second correction unit 30 is set to a range in which the load of the gas turbine is a medium-high load, and therefore, the first correction unit operation range setting device (FX5) 23 and the first correction unit 20 respectively. 2 In the correction unit operation range setter (FX7) 35, the function is performed using a function for the generator output set value set from the output of the generator 150 (output of the generator output sensor) or the target value of the generator output. In this embodiment, the turbine inlet temperature is used instead of the output of the generator 150.

  Since the turbine inlet temperature is not directly measured, an alternative index is used. More specifically, for example, in a “gas turbine combustion control device” disclosed in Japanese Patent Application Laid-Open No. 2007-77867, a combustion load command value (CLCSO) proportional to a turbine inlet temperature, a gas turbine output, and an inlet guide vane are provided. The technique of calculating based on the opening degree of 104 and the intake air temperature of the compressor 102 is disclosed, and this combustion load command value (CLCSO) can be used as a substitute index.

  In this way, by setting the operating ranges of the first correction unit 20 and the second correction unit 30 using the turbine inlet temperature (or substitute index), the inlet guide vanes 104 are fully opened at the point where the turbine inlet temperature is the severest. Operation becomes possible, and finer control is possible.

[Fourth Embodiment]
Next, an operation control apparatus for a gas turbine according to a fourth embodiment of the present invention will be described. In the first embodiment, the operation range of the first correction unit 20 and the second correction unit 30 is set to a range in which the load of the gas turbine is a medium-high load, and therefore, the first correction unit operation range setting device (FX5) 23 and the first correction unit 20 respectively. 2 In the correction unit operation range setter (FX7) 35, the function is performed using a function for the generator output set value set from the output of the generator 150 (output of the generator output sensor) or the target value of the generator output. In this embodiment, the blade path temperature, which is the gas temperature immediately after passing through the blade at the final stage of the turbine, is used instead of the output of the generator 150.

  The blade path temperature is directly measured by the blade path temperature detector 123 and used. By using the measured value, the control reliability can be further improved as compared with the third embodiment. However, since the turbine inlet temperature is not used, it is necessary to set the temperature more safely.

In this way, by setting the operating ranges of the first correction unit 20 and the second correction unit 30 using the blade path temperature, it is possible to operate the inlet guide blade 104 to be fully opened at the point where the turbine inlet temperature is the severest. Thus, finer control becomes possible.

[Modification]
Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and includes design changes and the like within a scope that does not depart from the gist of the present invention. .

  For example, in the specification and drawings of the present application, in the fuel control unit 112 of the control unit 111 that is not mentioned in detail, the temperature control limit value, the load limit value, Alternatively, the standby value (RSCO) may be expanded to a point where overshoot is allowed. Since the intake flow rate of the compressor 102 is increased by the operation control by the gas turbine operation control device in the first to fourth embodiments, the fuel supply amount can be increased, and the limit value and standby By expanding the value, it is possible to meet a load request of 100% or more without affecting the temperature control or the load limit.

It is a block diagram of the operation control apparatus of the gas turbine which concerns on embodiment of this invention. It is a specific block diagram of the IGV control part 113 in 1st Embodiment. It is explanatory drawing explaining the function which the various function devices of the IGV control part 113 in 1st Embodiment, and an operation range setting device have. It is a time chart of various specifications when a system frequency falls in a 1st embodiment. It is a specific block diagram of the IGV control part 113 in 2nd Embodiment. It is a time chart of various amounts when a system frequency falls in a 2nd embodiment. It is a block diagram of the operation control apparatus of the conventional gas turbine. It is a specific partial block diagram of the control part 110 in a prior art example. It is explanatory drawing explaining the function which the various function devices of the control part 110 in a prior art have. It is a time chart of various amounts when a system frequency falls in a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inlet guide blade opening degree setting part 20 and 40 1st correction | amendment part 30 2nd correction | amendment part 100 Gas turbine 101 Turbine 102 Compressor 103 Combustor 104 Inlet guide blade 105 Fuel flow rate adjustment valve 111 Control part 112 Fuel control part 113 IGV control 116 Control signal 117 IGV opening command 121 Intake state detector 122 Car interior pressure sensor 123 Blade path temperature detector 124 Exhaust gas temperature detector 150 Generator 160 Steam turbine

Claims (7)

An operation control device for a gas turbine that supplies compressed air and fuel from a compressor having an inlet guide vane in a front stage to a combustor and drives the generator by rotating the turbine with combustion gas generated in the combustor. And
An inlet guide blade opening setting means for setting the opening of the inlet guide blade from the detected value of the generator output, based on the relationship of the opening of the inlet guide blade to the preset output of the generator;
First correction means for calculating a first opening correction amount of the inlet guide blade according to the frequency fluctuation amount with respect to frequency fluctuation exceeding a certain amount;
Operation of the gas turbine for controlling the inlet guide vanes based on the opening obtained by adding the opening set by the inlet guide vane opening setting means and the first opening correction amount calculated by the first correction means Control device. A second correction means that issues calculate the second opening correction amount of the inlet guide vane which calculates the load change of the gas turbine from the output of the generator according to the load variation,
The opening set by the inlet guide blade opening setting means, the first opening correction amount calculated by the first correction means, and the second opening correction amount calculated by the second correction means are added. The operation control device for a gas turbine according to claim 1, wherein the inlet guide vanes are controlled based on an opening degree . The rate of time change of at least one of the first opening correction amount of the first correction means and the second opening correction amount of the second correction means is not more than a predetermined value determined from the restriction of the inlet temperature of the turbine. The operation control apparatus for a gas turbine according to claim 1 or 2, further comprising a change rate limiting means for limiting to a maximum value. A predetermined range of the generator output corresponding to the range of medium load to high load is preset,
Wherein at least one of the first correction means and said second correction means, the operation control of the gas turbine according to any one of claims 1 to 3 in which the output of the generator is operated when in the predetermined range apparatus. A predetermined range of the inlet temperature of the turbine corresponding to a range from medium load to high load is preset,
Wherein at least one of the first correction means and said second correction means, the operation control of the gas turbine according to any one of claims 1 to 3 in which the inlet temperature of the turbine is operated when in the predetermined range apparatus. A predetermined range of blade path temperature corresponding to the range from medium load to high load is preset,
Wherein at least one of the first correction means and before Symbol second correction means, the gas turbine according to any one of claims 1 to 3, wherein the blade path temperature is activated when in the predetermined range Operation control device. This is a gas turbine operation control method in which compressed air and fuel from a compressor having an inlet guide vane in the preceding stage are supplied to a combustor, and the generator is driven by rotating the turbine with combustion gas generated in the combustor. And
A first step of setting the opening of the inlet guide vane from a detected value of the generator output based on a preset relationship of the opening of the inlet guide vane to the output of the generator;
A second step of calculating a first opening correction amount of the inlet guide blade according to the frequency fluctuation amount for frequency fluctuation exceeding a certain amount ;
Including
A gas turbine operation control method for controlling the inlet guide vane based on an opening obtained by adding the opening set in the first step and the first opening correction amount calculated in the second step .

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