JP2010256174A - Gas turbine control apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the maintainability of a gas turbine apparatus. <P>SOLUTION: The gas turbine control apparatus includes: an input unit to which, from a differential transformer including a movable core which operates together with the opening of a valve, a primary coil 32 placed around the movable core, and two secondary coils provided corresponding to the primary coil 32, when the position of the movable core with respect to the primary coil 32 and the two secondary coils changes, the voltage value of an exciting voltage applied from a power source to the primary coil 32 and the voltage value of an induced voltage occurring in the two secondary coils by the exciting voltage are input; a position calculation unit 38 for calculating information indicating the position of the movable core by dividing the difference in the voltage values of the induced voltage determined from the induced voltage of the two secondary coils, respectively, by the voltage value of the exciting voltage; and an output unit for determining the opening of the valve on the basis of the calculated position of the movable core and outputting an opening indication value indicating the opening of the valve to an opening control unit which controls the opening of the valve. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to, for example, a gas turbine control device that controls a gas turbine provided in a power generation facility, and more particularly, to a gas turbine control device that is suitable for application to control the opening of a valve provided in a gas turbine.

  2. Description of the Related Art Conventionally, there is a gas turbine control device including a differential transformer as a valve opening detector for gas turbine equipment. The differential transformer includes a primary coil and two secondary coils, and includes a movable iron core between the primary coil and the two secondary coils. The position of the movable iron core changes in conjunction with the opening of the valve.

  When the gas turbine control device excites the primary coil with alternating current (excitation voltage with a constant frequency), an induced voltage is generated in the two secondary coils in accordance with the amount of displacement of the movable iron core. And a gas turbine control apparatus takes in the voltage value of the induced voltage which two secondary coils generate | occur | produced, and calculates the voltage difference. In the database provided in the gas turbine control device, the relationship between the valve opening degree defined in the range of 0% to 100% and the voltage difference corresponding to the opening degree is stored. For this reason, the gas turbine control device can obtain the opening of the valve from the voltage difference, and controls the opening of the valve so that the opening becomes a predetermined value.

  Patent Document 1 discloses a position measurement system that measures a valve position.

JP 2008-139100 A

  By the way, a gas turbine control device is provided with the alternating current (constant frequency voltage) voltage generation mechanism which excites a primary coil. When the AC voltage generation mechanism deteriorates over time, the excitation voltage decreases, so that the voltage difference between the two secondary coils becomes small, and measurement is made smaller than the actual opening of the valve. As a result, the measured opening and the actual opening may deviate. In order to match the measured opening and the actual opening, it is necessary to periodically measure the valve position and the voltage difference between the two secondary coils and adjust the program of the gas turbine control device.

  The present invention has been made in view of such a situation, and an object thereof is to improve the maintainability of a gas turbine control device.

  According to the present invention, a gas turbine control device includes a movable iron core that is linked to the opening of a valve, a primary coil that is disposed around the movable iron core, and two secondary coils that are provided corresponding to the primary coil. When the position of the movable iron core with respect to the primary coil and the two secondary coils changes from the differential transformer having, the excitation voltage applied to the primary coil from the power source and the excitation coil to the two secondary coils Obtain the voltage value difference from the induced voltage of each of the two secondary coils and the input unit to which the voltage value of the induced voltage generated is input, divide the voltage value difference of the induced voltage by the voltage value of the excitation voltage, Based on the calculated position of the movable iron core, the position calculation unit for calculating the information indicating the position of the movable iron core, the valve opening is obtained, and the opening instruction value for instructing the valve opening is Output unit that outputs to the opening control unit that controls the opening And comprising.

  According to the present invention, the gas turbine control device obtains information indicating the position of the movable iron core by dividing the voltage difference between the two secondary coils input from the differential transformer by the voltage value of the primary coil. Based on this information, an opening degree instruction value for instructing the opening degree of the valve can be output to the opening degree control unit. For this reason, even if the AC (constant frequency voltage) voltage generation mechanism that excites the primary coil deteriorates over time, the measured opening and the actual opening coincide with each other, and the gas turbine that must be periodically implemented There is an effect that it is unnecessary to adjust the program of the control device.

It is a block diagram which shows the example of the gas turbine control system in one embodiment of this invention. It is a block diagram which shows the example of an internal structure of the gas turbine control apparatus in one embodiment of this invention. It is a block diagram which shows the example of an internal structure of the gas turbine control apparatus in one embodiment of this invention. It is a block diagram which shows the internal structural example of the valve | bulb control apparatus in one embodiment of this invention. It is explanatory drawing which shows the example of a relationship between the voltage ratio in one embodiment of this invention, and the opening degree of a valve | bulb.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, an example of the configuration and operation of the gas turbine control system 100 that controls the output of the gas turbine 21 and generates electric power will be described.

  FIG. 1 shows a configuration example of a gas turbine control system 100.

  The gas turbine control system 100 includes a combustor 2 that combusts liquefied natural gas (LNG: Liquefied Natural Gas, hereinafter referred to as “fuel gas”), and a gas turbine 21 that is driven by the combustion gas discharged from the combustor 2. The gas turbine control device 20 that controls the operation of the gas turbine 21 is provided.

  The gas turbine 21 includes an air compressor 1 that compresses air, a combustor 2, and a turbine 3. The combustor 2 generates combustion gas by burning the fuel gas input as fuel together with the air compressed by the air compressor 1. In addition to the fuel gas, the fuel input to the combustor 2 includes heavy oil and off-gas generated when oil is refined from crude oil.

  The air compressor inlet guide vane 4 installed at the inlet of the air compressor 1 has a function of adjusting the intake air flow rate of the air compressor 1 and includes a valve (not shown). The turbine 3 is driven by the combustion gas to generate power from the generator 5. Electric power generated by the generator 5 is transmitted by the power transmission system 6. A generator breaker 11 and a system breaker 12 are connected to the power transmission system 6. An open / close detection signal 13 that detects the open / close state of the generator breaker 11 is input to the gas turbine control device 20, and an open / close detection signal 14 that detects the open / close state of the system breaker 12 is input to the gas turbine control device 20. .

The gas turbine 21 is usually provided with a multi-can combustor, but FIG. 1 shows only the two can combustors 2 and 2 '.
Here, the region 22a shows a configuration example of the combustion burner when the combustor 2 is viewed from the axial direction, and the region 22b shows a configuration example of the combustion burner when the combustor 2 is viewed from the side. Show.

  A plurality of combustion burners are installed on the upstream side inside the combustor 2. The breakdown of the combustion burner is one system of diffusion combustion burner 7 installed at the center position in the axial direction of the combustor and four systems of premixed combustion burners 8 a to 8 d installed around the diffusion combustion burner 7. That is, the gas turbine 21 of this example includes five burners for one can combustor.

The other combustors 2 ′ included in the gas turbine 21 have the same configuration as the combustor 2. For example, the combustor 2 ′ includes one system of diffusion combustion burner 7 ′ and four systems of premixed combustion burners 8 a ′ to 8 d ′ installed around the diffusion combustion burner 7 ′.
In addition to the configuration of the five burners shown in the combustor 2 of the present example, a combustor having only one combustion burner may be used.

  The fuel supply path for supplying the fuel gas to the gas turbine 21 includes a base fuel supply system 19a, a mother fuel supply system 19b, and a child fuel supply system 19c. The base fuel supply system 19a includes the adjustment valve 9 and is connected to the mother fuel supply system 19b. The regulating valve 9 includes a valve, and serves as both a valve that shuts off the fuel gas and a valve that regulates the pressure of the fuel gas.

  A mother fuel supply system 19b that supplies fuel gas to the combustors 2 and 2 'is branched into five systems from the base fuel supply system 19a. Each of the five mother fuel supply systems 19b includes fuel gas flow control valves 10a to 10e. Moreover, each fuel gas flow control valve 10a-10e is provided with a valve not shown. The fuel gas flow rate adjusting valves 10a to 10d adjust the flow rate of the fuel gas supplied to the four premixed combustion burners 8a to 8d and 8a 'to 8d' of the combustors 2 and 2 '. Further, the fuel gas flow rate adjusting valve 10e adjusts the flow rate of the fuel gas supplied to the one diffusion combustion burner 7, 7 'of the combustors 2, 2'.

  Furthermore, child fuel supply systems 19c and 19c 'are connected to the mother fuel supply system 19b via a manifold (not shown). The child fuel supply systems 19c and 19c ′ are prepared for the number of cans of the combustor. The sub fuel supply system 19 c adjusts the flow rate of the fuel gas supplied from the mother fuel supply system 19 b and supplies the fuel gas to the diffusion combustion burner 7 and the premixed combustion burners 8 a to 8 d of the combustor 2. Similarly, the child fuel supply system 19c ′ adjusts the flow rate of the fuel gas supplied from the mother fuel supply system 19b to the diffusion burner 7 ′ and the premixed combustion burners 8a ′ to 8d ′ of the combustor 2. Supply fuel gas.

  Then, the gas turbine control device 20 controls the air compressor inlet guide vane 4, the regulating valve 9, and the fuel gas flow rate regulating valves 10a to 10e, and the diffusion combustion burners 7 and 7 'and the premixed combustion burner 8a to 8a. The flow rate of the fuel gas supplied to 8d, 8a 'to 8d' is controlled.

  On the other hand, the gas turbine control device 20 compares the power supply command value with the feedback value 15 output from the generator 5, the turbine speed feedback value 16 that measures the speed of the turbine 3, and the exhaust temperature that measures the exhaust temperature of the turbine 3. The operation state of the gas turbine 21 is monitored by receiving the feedback value 17 or the like. Then, the gas turbine control device 20 outputs a main fuel command value for instructing the supply amount of the fuel gas, and changes the flow rate of the fuel gas determined by the main fuel command value to thereby output the power value output from the generator 5. Is controlled to be a predetermined value.

  The main fuel command value is divided into five fuel command values 18a to 18e for the purpose of adjusting the flow rate of the fuel gas according to a predetermined operating load. The five fuel command values 18a to 18e drive the fuel gas flow rate adjusting valves 10a to 10e provided in the corresponding five mother fuel supply systems 19b, respectively, and control the flow rate of the fuel gas in each mother fuel supply system 19b. Adjust.

  The differential transformer 34 (see FIG. 3 described later) is installed in each of the valves included in the above-described air compressor inlet guide vane 4, the regulating valve 9, and the fuel gas flow rate regulating valves 10a to 10e. And the gas turbine control apparatus 20 can control the opening degree of a valve so that it may be suitable for the flow volume of fuel gas by measuring the opening degree of a valve with the differential transformer 34. FIG.

The gas turbine control system 100 of this example is applied when generating power in order to achieve the first object described below, but may be applied to the second to fifth objects.
The first purpose is that an electric power company supplies electric power to companies and general households.
The second purpose is that a gas company or the like sells electric power to an electric power company.
The third purpose is to sell electric power directly to a company that a gas company or the like borrows and contracts with an existing electric power network owned by the electric power company.
The fourth purpose is to effectively utilize the unusable exhaust gas called off-gas generated when refining oil from crude oil in an oil refinery factory of an oil company without incineration.
The fifth object is to provide a heat source for creating steam for use in a chemical plant factory.

  FIG. 2 shows an internal configuration example of the gas turbine control device 20.

  The gas turbine control device 20 calculates the opening degrees of the valves included in the air compressor inlet guide vanes 4, the regulating valve 9, and the fuel gas flow rate regulating valves 10a to 10e. Abbreviated as “three CPUs”). The three CPUs each include a first power supply device 24a to a third power supply device 24c. The first power supply device 24a to the third power supply device 24c are respectively supplied with one DC power supply and one AC power supply. Thereby, even if an abnormality occurs in a certain one system power supply and the power supply is stopped, the power supply is continued to be supplied from the other one system, so that the gas turbine control device 20 can be continuously operated. .

  In addition, the gas turbine control device 20 includes an input unit 25a to which the above-described various feedback values, measurement values, and the like are input. The same input signal is input to each of the three CPUs via the input unit 25a. This input signal includes, for example, opening degree information indicating the opening degree of the valve supplied from a differential transformer 34 described later. Each of the three CPUs performs various arithmetic processes on the input signal using a built-in program.

Here, another configuration example of the input unit 25a will be described as a reference.
First, after a signal is amplified by a distributor, a signal is input to an input unit provided in each of three CPUs.
Secondly, after one signal is input to a common input unit, three CPUs input signals through respective lines.
Thirdly, after inputting one signal to a common input unit, three CPUs sequentially input signals through the same line.
Fourth, after one signal is input to the common input unit, only the main CPU directly inputs the signal, and the other two CPUs input the input signal from the main CPU via the communication line. There is something to be done.

  In addition, the gas turbine control device 20 includes an output unit 25b that outputs a calculation result to each unit. The output unit 25b includes three sub CPUs (see FIG. 5 described later) for each of the three CPUs. When the output result is a digital value, the output unit 25b outputs the most frequent value calculated by the three CPUs (if the value calculated by two CPUs among the three is the most frequent, The value calculated by the CPU is output to an opening degree control unit 29 (see FIG. 5 described later) that controls the opening degree of the valve.

  When the output result is an analog value, the output unit 25b uses an intermediate value calculated by the three CPUs as the output of the gas turbine control device 20. Further, as shown in FIG. 5 to be described later, the output unit 25b provides an opening command to the opening control unit 29 that controls the electromagnetic force generated by the coils 28a to 28c through three control lines individually. Output the value. However, the output unit 25b may select one value from a plurality of opening command values and output the selected value to the opening control unit 29 via a single control line.

Here, another configuration example of the output unit 25b will be described as a reference.
First, there is one in which an external processing device selects a mode value and an intermediate value after outputting signals from output units individually provided by three CPUs.
Second, after three CPUs output signals on their respective lines, the output unit selects the mode value and the intermediate value.
Thirdly, after three CPUs output signals in order on a common line, an output unit selects a mode value and an intermediate value.
Fourth, after the main CPU collects output signals from the other two CPUs via the communication line and selects the mode value and the intermediate value in the main CPU, only the main CPU outputs the output signal. Some output

  FIG. 3 shows an internal configuration example of the measurement unit 35 provided in each of the three CPUs.

  A movable iron core transformer 31 used for measuring the opening degree of the valve includes a movable iron core (not shown) that is linked to the opening degree of the valve, and one primary coil 32 disposed around the movable iron core. A differential transformer 34 having a first secondary coil 33a and a second secondary coil 33b (hereinafter, abbreviated as “two secondary coils”) provided corresponding to the primary coil 32. Prepare. In this example, a configuration in which the second secondary coil 33 b is included in a part of the primary coil 32. The adjusting valve 9 and the fuel gas flow rate adjusting valves 10 a to 10 e described above are each configured as a part of the movable iron core transformer 31.

  In the gas turbine control system 100 of this example, although two movable iron core transformers 31 are provided for one valve for redundancy, in the following description, one movable iron core transformer is used. The container 31 will be described. In FIG. 3, the description of the input unit 25a is omitted.

  The movable iron core is displaced when the valve opening changes. On the other hand, when the gas turbine control device 20 excites the primary coil 32 with an alternating voltage having a constant frequency, an induced voltage is generated in the two secondary coils. When the position of the movable iron core with respect to the primary coil 32 and the two secondary coils changes, the excitation voltage applied to the primary coil 32 from the power source and the voltage of the induced voltage generated in the two secondary coils by the excitation voltage The value changes. The voltage values of the excitation voltage and the induced voltage are included in the opening degree information input to the input unit 25a described above.

  For example, when the movable iron core is at the center of two secondary coils, the movable iron core is stopped at a symmetrical position, and the induced voltages of the two secondary coils are equal. Become. However, when the movable iron core is displaced from the center of the two secondary coils, the voltage values of the induced voltages of the two secondary coils are different. Further, the difference in the voltage values of the induced voltages of the two secondary coils is opposite between the case where the movable iron core is on the right side and the left side with respect to the center of the two secondary coils. Using this phenomenon, the gas turbine control device 20 takes in the voltage value of the induced voltage of the two secondary coils, and converts the magnitude of the left and right displacement of the movable iron core into the magnitude of the positive and negative DC voltage. Thus, the displacement of the movable iron core is measured.

Here, the gas turbine control device 20 of the present example calculates a voltage ratio between the primary coil 32 and the two secondary coils, and thereby outputs a predetermined displacement output regardless of the aged deterioration of the voltage generation mechanism described above. It is what you want.
And the gas turbine control apparatus 20 is provided with the measurement part 35 which measures the position of a movable iron core. The measurement unit 35 is provided in each of the three CPUs described above, and the three CPUs simultaneously calculate the position of the movable iron core, thereby improving the reliability of the calculation result.

Here, an internal configuration example of the measurement unit 35 will be described.
The measuring unit 35 subtracts another voltage value from one voltage value among the voltage values of the oscillating unit 36 that excites the timing signal at a predetermined frequency and the induced voltage supplied from the two secondary coils. Is provided with a subtracting section 37 for calculating the difference between the two. In this example, for ease of explanation, the voltage value output by the second secondary coil 33b is “A”, and the voltage value output by the first secondary coil 33a is “B”. Then, the subtraction unit 37 obtains the voltage difference “A−B” by subtracting the voltage value “B” from the voltage value “A”.

  In addition, the gas turbine control device 20 includes a position calculation unit 38 that calculates information indicating the position of the movable iron core. The position calculation unit 38 obtains a voltage value difference from the induced voltages of the two secondary coils, and divides the voltage value difference of the induced voltages by the voltage value of the excitation voltage supplied from the primary coil 32. The information indicating the position of the movable iron core is calculated.

Here, an example of the internal configuration of the position calculation unit 38 will be described.
The position calculation unit 38 outputs a first amplitude value calculation unit 39 a that calculates a first amplitude value “C” of the voltage from the voltage value of the excitation voltage supplied from the primary coil 32, and the subtraction unit 37 outputs. A second amplitude value calculating unit 39b that calculates a second amplitude value “D” from the differential voltage value “A−B” is provided.

  Further, the gas turbine control device 20 divides the second amplitude value “D” by the first amplitude value “C” to obtain a division value “D / C”, and the division value “D / C”. ”Includes a position information calculation unit 41 that calculates the position of the movable iron core. The position information calculation unit 41 refers to an internal table (not shown), calculates the position of the movable iron core, and outputs position information indicating the position of the movable iron core. In this example, a position number indicating the position of the movable iron core is output as the position information. Thereby, the position (displacement amount) of the movable iron core is determined.

Here, the voltage value of the second secondary coil 33b is V _2A , the voltage V ₁ indicating the excitation voltage value of the primary coil 32, the function P _2A (x) that changes depending on the position of the movable iron core, and the constant When C _2A is used, the following formula (1) is obtained. The voltage value V _2A obtained by Expression (1) corresponds to the voltage value “A” supplied to the subtracting unit 37.

V _2A = V ₁ · C _2A · P _2A (x) (1)

Similar to the equation (1), the following equation (2) is obtained for the first secondary coil 33a. The voltage value V _2B obtained by Expression (2) corresponds to the voltage value “B” supplied to the subtraction unit 37.

V _2B = V ₁ · C _2B · P _2B (x) (2)

  Therefore, the voltage ratio between the two secondary coils is obtained from the following equation (3).

Voltage ratio = V _2A / V _2B
= C _2A · P _2A (x) / C _2B · P _2B (x) (3)

It can be seen that the voltage ratio obtained by Equation (3) is not affected by the voltage drop of the voltage V ₁ due to the aging deterioration of the AC voltage generation mechanism because the contribution of the voltage V ₁ of the primary coil 32 is lost. However, it has been found that this calculation alone makes the valve control unstable near the voltage difference between the two secondary coils being zero.

  FIG. 4 shows an example of the voltage ratio between the two secondary coils and the valve opening.

  From this graph, it is shown that the first derivative of the voltage ratio becomes discontinuous in the vicinity where the voltage difference between the two secondary coils becomes zero. Since there is a jump in the voltage ratio in the vicinity of the valve opening of 50%, the valve control becomes unstable in the vicinity of this opening.

Therefore, the division unit 40 uses the following equation (4) that divides the voltage difference between the two secondary coils by the voltage value of the primary coil 32. Among the values derived by the equation (4), V ₁ corresponds to the amplitude value “C” output from the first amplitude value calculation unit 39a. Further, V ₁ (C _2A · P _2A (x) −C _2B · P _2B (x)) corresponds to the second amplitude value “D” output from the second amplitude value calculation unit 39b.

Voltage difference between two secondary coils / voltage of primary coil = V ₁ (C _2A · P _2A (x) −C _2B · P _2B (x)) / V ₁
= C _2A · P _2A (x) −C _2B · P _2B (x) (4)

The value obtained by Expression (4) is not affected by the voltage drop of the voltage V ₁ because the contribution of the voltage V ₁ of the primary coil 32 is lost. Further, in the vicinity where the voltage difference between the two secondary coils becomes zero, the first derivative of the voltage ratio is continuous. For this reason, if the position of the valve and the voltage difference between the two secondary coils are regularly measured, the program of the gas turbine control device 20 need not be adjusted.

  FIG. 5 shows a configuration example of a mechanism in which three CPUs adjust the opening degree of the valve.

  The opening degree of the valve is controlled by coils 28a to 28c that are disposed around the valve and exert electromagnetic force on the valve. The coils 28a to 28c are connected to the three CPUs via the output unit 25b. The output value output by the three CPUs is output as an average value electromagnetically in the output unit 25b. Since the valve control requires high-speed control, three sub CPUs (first sub CPU 26a to third sub CPU 26c) each having three CPUs specialize in arithmetic processing for controlling the valve. To do. In this example, three sub CPUs are stored in the output unit 25b.

  Then, the output unit 25 b outputs an opening degree command value that indicates the opening degree of the valve calculated by the three sub CPUs to the opening degree control unit 29. When the opening degree control unit 29 receives the opening degree command value, the opening degree control unit 29 controls the electromagnetic force of the coils 28a to 28c to adjust the opening degree of the valve.

  According to the gas turbine control device 20 according to the present embodiment described above, the movable iron is divided by dividing the voltage difference between the two secondary coils input from the differential transformer 34 by the voltage value of the primary coil 32. Information indicating the position of the lead is obtained. Based on this information, an opening degree instruction value for instructing the opening degree of the valve can be output to the opening degree control unit 29. For this reason, even if the alternating current (constant frequency voltage) voltage generation mechanism that excites the primary coil 32 deteriorates over time, the measured opening and the actual opening coincide with each other, and the gas that needs to be periodically implemented There is an effect that it is unnecessary to adjust the program of the turbine control device. For this reason, there exists an effect that the improvement of the maintainability of the gas turbine control apparatus 20 provided with a valve | bulb and an action | operation transformer can be aimed at.

  Further, since the opening degree control unit 29 is formed by coils 28a to 28c that control the opening degree of the valve by electromagnetic force, remote control is easy, and it is easy to maintain the opening degree of the valve at a predetermined value. effective.

  DESCRIPTION OF SYMBOLS 1 ... Air compressor, 2, 2 '... Combustor, 3 ... Turbine, 4 ... Air compressor inlet guide vane, 5 ... Generator, 6 ... Power transmission system, 7, 7' ... Diffusion combustion burner, 8a, 8a '... premixed combustion burner, 9 ... regulating valve, 10a to 10e ... fuel gas flow rate regulating valve, 11 ... generator circuit breaker, 12 ... system breaker, 19a ... base fuel supply system, 19b ... mother fuel supply system, 19c, 19c '... child fuel supply system, 20 ... gas turbine control device, 21 ... gas turbine, 23a-23c ... first CPU to third CPU, 24a-24c ... first power supply device to third power supply Device, 25a ... Input unit, 25b ... Output unit, 26a-26c ... First sub CPU to third sub CPU, 28a-28c ... Coil, 29 ... Opening control unit, 31 ... Movable iron core transformer, 32 ... primary coil, 33a ... first secondary coil, 33 ... second secondary coil, 34 ... differential transformer, 35 ... measurement unit, 36 ... oscillation unit, 37 ... subtraction unit, 38 ... position calculation unit, 39a ... first amplitude value calculation unit, 39b ... second Amplitude value calculation unit, 40 ... division unit, 41 ... position information calculation unit, 100 ... gas turbine control system

Claims (3)

From a differential transformer having a movable iron core linked to the opening of the valve, a primary coil arranged around the movable iron core, and two secondary coils provided corresponding to the primary coil When the position of the movable iron core with respect to the primary coil and the two secondary coils changes, the two secondary coils depend on the voltage value of the excitation voltage applied to the primary coil from the power source and the excitation voltage. An input unit to which the voltage value of the induced voltage generated in
A position calculation unit that calculates information indicating the position of the movable iron core by dividing the difference between the voltage values of the induced voltages obtained from the induced voltages of the two secondary coils by the voltage value of the excitation voltage. When,
Based on the calculated position of the movable iron core, the opening degree of the valve is obtained, and an opening degree instruction value for instructing the opening degree of the valve is output to an opening degree control unit for controlling the opening degree of the valve. And a gas turbine control device. The gas turbine control device according to claim 1, wherein
The position calculator is
A first amplitude value calculator for calculating a first amplitude value from the voltage value of the excitation voltage supplied from the primary coil;
A second amplitude value calculation that calculates a second amplitude value from a difference value obtained by subtracting another voltage value from one voltage value among the voltage values of the induced voltage supplied from the two secondary coils. And
A division unit that obtains a division value by dividing the second amplitude value by the first amplitude value;
A gas turbine control device comprising: a position information calculation unit that calculates a position of the movable iron core based on the division value and outputs information indicating the position of the movable iron core. The gas turbine control device according to claim 2, wherein
The gas turbine control device, wherein the opening degree control unit is formed by a coil that controls the opening degree of the valve by electromagnetic force.

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