JP6212281B2 - Turbine control device and turbine control method - Google Patents

Description

  The present invention relates to a technique for controlling a turbine.

  It is known that when the turbine is started, the steam is controlled by a main steam stop valve, and during normal load operation, the steam is controlled by a steam control valve. Therefore, valve switching control from the main steam stop valve to the steam control valve is performed. In this valve switching control, the turbine control device outputs a throttle operation command to the steam control valve, and narrows down the steam control valve to an opening that is equivalent to the amount of steam passing through the main steam stop valve.

  The valve switching control narrows down the steam control valves while monitoring the steam pressure before and after the main steam stop valve. That is, the steam pressure after the main steam stop valve rises according to the narrowing of the steam control valve, so that the differential pressure ratio between the steam pressure before the main steam stop valve and the steam pressure after the main steam stop valve becomes less than the specified differential pressure ratio. When the main steam stop valve is fully open, valve switching control is performed.

  As a first technique for valve switching control, an appropriate opening degree that does not cause fluctuations in generator output for the steam control valve is obtained from the main steam pressure, temperature, and generator output immediately before the start of valve switching control, and the steam control valve is A technique is known that controls the generator output fluctuation by continuously controlling in the closing direction up to an appropriate opening degree + α (for example, Patent Document 1).

  As a second technique of valve switching control, in order to shorten the time for valve switching control, a differential pressure ratio between the steam pressure before the main steam stop valve and the steam pressure after the main steam stop valve is calculated, and the steam is changed according to the differential pressure ratio. A technique is known in which the operation amount for narrowing the control valve is switched in stages from high speed, medium speed, low speed, and fine speed (for example, Patent Document 2).

JP-A-5-195713 JP 2005-155391 A

  Even if initial adjustment is performed to suppress fluctuations in generator output during valve switching control, the main steam stop valve is opened according to the narrowing of the steam control valve due to changes in the plant steam conditions and mechanical characteristics over time. However, an event may occur in which fluctuations in generator output cannot be suppressed. If the generator output fluctuates, it will cause disturbances to the entire plant and the system including the boiler system, which will affect the plant life and the power system.

  In order to solve the above problems, a turbine control apparatus according to an aspect of the present invention flows from a boiler, a reference output storage unit that stores a reference output that is a reference value of an output of a generator connected to the turbine, and the boiler A valve that throttles the steam control valve and opens the main steam stop valve with respect to a main steam stop valve that controls the amount of steam and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine During the switching control, a first pressure of the steam before passing through the main steam stop valve and a second pressure of the steam after passing through the main steam stop valve are acquired, and the first pressure and the second pressure are acquired. A differential pressure ratio calculation unit that calculates a differential pressure ratio of pressure; an output difference calculation unit that acquires a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output; , Based on the differential pressure ratio and the output difference, Serial comprises a steam control valve controller for controlling the opening of the steam control valve, the.

  According to one aspect of the present invention, in the valve switching control, the output fluctuation of the generator can be suppressed by controlling the opening of the steam control valve based on the differential pressure ratio and the generator output.

The structure of the turbine control apparatus of the Example of this invention is shown. 3 shows the configuration of the control valve operation amount calculation unit 420. The structure of the generator output deviation calculation part 430 and the adjustment valve operation amount correction | amendment part 440 is shown. The relationship between valve switching control and generator output fluctuation is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the configuration of a turbine control apparatus according to an embodiment of the present invention.

  The plant includes a boiler 100, a turbine 200, a generator 300, and a turbine control device 400. Further, the plant includes a main steam stop valve (MSV) 120 and a steam control valve (CV) 140 in a flow path of steam flowing from the boiler 100 to the turbine 200.

  The steam control valve 140 adjusts driving steam to the turbine 200 directly connected to the generator 300. The main steam stop valve 120 blocks steam flowing into the turbine 200. Each of the main steam stop valve 120 and the steam control valve 140 has a drive device for driving the valve. The turbine control device 400 outputs a main steam stop valve operation amount for controlling the drive device of the main steam stop valve 120, and outputs a throttle amount for controlling the drive device of the steam control valve 140. The main steam stop valve operation amount indicates the amount by which the opening degree of the main steam stop valve 120 is increased, and the throttle amount indicates the amount by which the opening degree of the steam control valve 140 is decreased. The main steam stop valve operation amount may indicate the amount by which the opening degree of the main steam stop valve 120 is decreased, or may indicate the opening degree of the main steam stop valve 120. The throttle amount may indicate an amount by which the opening of the steam control valve 140 is increased, or may indicate the opening of the steam control valve 140.

  Further, the plant is provided in front of the main steam stop valve 120 in the steam flow path, and after the main steam stop valve 120 and the main steam stop valve pre-pressure detector 110 for detecting the steam pressure before the main steam stop valve. And a main steam stop valve post-pressure detector 130 for detecting the steam pressure after the main steam stop valve.

  The turbine control device 400 includes a differential pressure ratio calculation unit 410, an adjustment valve operation amount calculation unit 420, a generator output deviation calculation unit 430, an adjustment valve operation amount correction unit 440, a main steam stop valve control unit 450, and an operation. It has a time control unit 460, a fully opened operation amount storage unit 470, a switch 520, a switch 530, a valve switching start determination unit 540, and a valve switching completion determination unit 550. The turbine control device 400 may include a microprocessor and a memory. In this case, the memory may store the program and data, and the microprocessor may execute the operation of the turbine control device 400 according to the program in the memory. Further, the turbine control device 400 may include an input unit that acquires input from an operator and a display unit that displays the state of the plant.

  The valve switching start determination unit 540 validates the valve switching start signal in response to a valve switching start instruction input from the operator. The valve switching start determination unit 540 may determine the stage of turbine startup, and may validate the valve switching start signal when the startup stage reaches a predetermined stage. In the valve switching control, the fully open steam control valve 140 is gradually throttled, and when a certain condition is satisfied, the main steam stop valve 120 is fully opened.

  The differential pressure ratio calculation unit 410 includes a main steam stop valve pre-pressure detector 110 detected by the main steam stop valve pre-pressure detector 110 and a main steam stop valve post-pressure detector 130 detected by the main steam stop valve post-pressure detector 130. Get on a regular basis. Thereafter, the differential pressure ratio calculation unit 410 obtains a deviation by subtracting the steam pressure after the main steam stop valve from the steam pressure before the main steam stop valve, and calculates a differential pressure ratio that is a ratio of the deviation to the steam pressure before the main steam stop valve. .

  The valve switching completion determination unit 550 determines whether or not the differential pressure ratio satisfies the valve switching completion condition. When the differential pressure ratio satisfies the valve switching completion condition, a valve switching completion signal indicating the completion of the valve switching control is validated. To. For example, the valve switching completion determination unit 550 determines that the differential pressure ratio satisfies the valve switching completion condition when the differential pressure ratio is equal to or less than a predetermined differential pressure ratio threshold. The differential pressure ratio threshold is, for example, 15%.

  The control valve operation amount calculation unit 420 calculates a basic throttle amount that is a basis of the throttle amount based on the differential pressure ratio. The generator output deviation calculation unit 430 stores the reference value of the output of the generator 300, acquires the measured value of the output of the generator 300, and calculates the generator output deviation that is the deviation of the measured value with respect to the reference value. The rectifying valve operation amount correcting unit 440 calculates the valve switching narrowing amount by correcting the basic narrowing amount based on the generator output deviation.

  The operation time control unit 460 outputs an operation time narrowing amount that is an operation amount for narrowing down the steam control valve 140 during normal load operation after the valve switching is completed. For example, the operation time control unit 460 calculates the operation time narrowing amount based on the generator output deviation. The switch 520 receives the valve switching narrowing amount and the operation narrowing amount, and receives a valve switching completion signal as a control signal. When the valve switching completion signal is not valid, the switcher 520 selects and outputs the throttle amount at the time of valve switching as the throttle amount. When the valve switching completion signal is valid, the selector 520 selects the throttle amount at the time of operation as the throttle amount. Output.

  Based on the generator output deviation, the main steam stop valve control unit 450 outputs a main steam stop valve operation amount during valve switching, which is an operation amount of the opening degree of the main steam stop valve 120 during valve switching. The fully open operation amount storage unit 470 outputs a fully open operation amount that is an operation amount for fully opening the main steam stop valve 120. The switch 530 selects the main steam stop valve operation amount at the time of valve switching when the main steam stop valve operation amount and the fully open operation amount at the time of valve switching are input and the valve switching completion signal is not input as a control signal. When a valve switching completion signal is input as a control signal, the fully open operation amount is selected and output as the main steam stop valve operation amount.

  FIG. 2 shows a configuration of the adjusting valve operation amount calculation unit 420.

  The adjustment valve operation amount calculation unit 420 includes a function calculator 610 and a subtractor 620. The function calculator 610 stores the function 611. A function 611 shows the relationship between the differential pressure ratio and the target valve opening (target opening) indicating the target opening of the steam control valve 140. The function calculator 610 uses the function 611 to calculate the target valve opening degree from the differential pressure ratio. In the function 611 in the figure, the horizontal axis indicates the differential pressure ratio, and the vertical axis indicates the target control valve opening. The function calculator 610 reduces the target valve opening degree by the function 611 as the differential pressure ratio increases. The function 611 is calculated by a valve combination test, data obtained during periodic inspection, and simulation, and stored in the memory of the function calculator 610. The function calculator 610 may store the coefficient of the function 611. The subtractor 620 calculates the basic throttle amount by acquiring the valve opening degree that is the current opening degree of the steam control valve 140 and subtracting the target valve opening degree from the valve opening degree. The basic throttle amount is an amount by which the opening degree of the steam control valve 140 is decreased. That is, the target valve opening degree can be achieved by reducing the valve opening degree by the basic throttle amount. Thereby, the increasing / decreasing valve operation amount calculation unit 420 increases the narrowing amount as the differential pressure ratio increases. Note that the basic throttle amount may be an amount by which the opening degree of the steam control valve 140 is increased.

  If the set value of valve switching control is determined based on the test data at the time of trial operation, and the set value is given by the initial setting, the initial setting and the mechanical characteristics change due to the steam conditions of the plant, etc. Different behavior may occur. On the other hand, the function 611 of the present embodiment can be changed based on data obtained from normal operation or periodic inspection. The data here are steam pressure before the main steam stop valve, steam pressure after the main steam stop valve, generator output, main steam stop valve opening, steam control valve opening, and the like. Thereby, the function 611 suitable for the state of the plant can be realized. Further, the time for narrowing the steam control valve 140 by the valve switching control can be shortened regardless of the steam condition and mechanical characteristic fluctuation of the plant.

  Variations in the amount of steam flowing into the turbine 200 cause variations in generator output. When the differential pressure ratio is large, the amount of steam flowing into the turbine 200 is throttled by the main steam stop valve 120. Therefore, even when the steam control valve 140 is greatly throttled, the variation in the amount of steam flowing into the turbine 200 is small. On the contrary, when the differential pressure ratio is small, if the steam control valve 140 is narrowed down greatly, the fluctuation of the amount of steam flowing into the turbine 200 is greatly affected. For this reason, the increasing / decreasing valve operation amount calculation unit 420 increases the basic narrowing amount as the differential pressure ratio increases. Thereby, the time for narrowing the steam control valve 140 can be shortened while suppressing the generator output fluctuation in the valve switching control.

  FIG. 3 shows the configuration of the generator output deviation calculation unit 430 and the adjustment valve operation amount correction unit 440.

  The generator output deviation calculation unit 430 periodically acquires the generator output (measurement output) from the generator 300. The generator output deviation calculation unit 430 includes a holder 710 and a subtracter 720. The retainer 710 retains the generator output as a reference generator output (reference output) when a valve switching start signal that is a control signal becomes valid. The subtractor 720 calculates a generator output deviation indicating a deviation of the generator output with respect to the reference generator output by subtracting the reference generator output from the generator output. By using such a generator output deviation, it is possible to control the steam control valve 140 and the main steam stop valve 120 so that the generator output approaches the generator output at the start of the valve switching control. The reference generator output may be a predetermined value.

  The adjustable valve operation amount correction unit 440 includes a gain 810, a gain 820, a sign inverter 830, a limiter 840, a switch 860, and an adder 870.

  The gain 810 multiplies the generator output deviation by a predetermined correction amount ratio (predetermined ratio).

  The gain 820 calculates the upper limit of the correction amount by multiplying the basic narrowing amount by a predetermined correction range ratio. The sign inverter 830 calculates the correction amount lower limit by inverting the sign of the correction amount upper limit. The limiter 840 limits the output of the gain 810 within a range defined by the correction amount lower limit and the correction amount upper limit. For example, the limiter 840 outputs the output of the gain 810 as it is if the output of the gain 810 is not less than the correction amount lower limit and not more than the correction amount upper limit, and if the output of the gain 810 is smaller than the correction amount lower limit, the correction amount lower limit is set. If the output of gain 810 is greater than the upper limit of correction amount, the upper limit of correction amount is output. By limiting the output of the gain 810 by the limiter 840, it is possible to prevent the steam control valve 140 from being throttled or the steam control valve 140 from being throttled rapidly.

  Note that any of the gains 810 and 820 and the limiter 840 may be a function calculator that performs a calculation using a function stored in advance.

  The switch 860 receives the output of the limiter 840 and 0, and receives a valve switching completion signal as a control signal. When the valve switching completion signal is not valid, the switch 860 selects the output of the limiter 840 and outputs it as a correction amount. When the valve switching completion signal is valid, the switch 860 selects 0 and outputs it as the correction amount. The adder 870 calculates the valve switching narrowing amount by adding a correction amount to the basic narrowing amount. For example, when the generator output is small with respect to the reference generator output, the correction amount becomes negative. Therefore, the valve switching narrowing amount is decreased with respect to the basic narrowing amount. The generator output deviation may be a value obtained by subtracting the generator output from the reference generator output. In such a case, the adder 870 may subtract the correction amount from the basic narrowing amount.

  If the steam control valve 140 is narrowed by the basic throttle amount, the generator output may decrease. By adding a correction amount to the basic narrowing amount, it is possible to suppress a decrease in generator output due to an excessive narrowing amount.

  Hereinafter, the control of the main steam stop valve 120 in the valve switching control will be described.

  The main steam stop valve 120 has a main steam stop valve (MSBV) for finely adjusting the opening degree of the main steam stop valve 120. The main steam stop small valve adjusts the opening degree of the main steam stop valve 120 within a predetermined ratio according to the output of the switch 530. The main steam stop valve control unit 450 calculates the main steam stop valve operation amount according to the generator output deviation. Here, the main steam stop valve controller 450 may increase the opening degree of the main steam stop small valve when the generator output deviation falls below a predetermined deviation threshold value (output difference threshold value) of 0 or less. Further, the main steam stop valve control unit 450 may increase the opening of the main steam stop valve according to the increase in the absolute value of the generator output deviation when the generator output deviation is below the deviation threshold. .

  When the generator output decreases with respect to the reference generator output, the decrease in the generator output can be suppressed by increasing the opening of the main steam stop small valve. Further, the reduction of the steam (generator output) flowing into the turbine 200 due to the narrowing of the steam control valve 140 is compensated by opening the main steam stop small valve, and if it cannot be compensated, the steam control valve 140 is narrowed by the correction amount. By suppressing the amount, the generator output fluctuation can be suppressed.

  Hereinafter, the effect of the turbine control apparatus 400 of the present embodiment will be described in comparison with the turbine control apparatus of the second technique described above.

  FIG. 4 shows the relationship between the valve switching control and the generator output fluctuation.

  The horizontal axis in this figure is time. An LLM (Load Limiter) position 910a indicates the opening degree of the steam control valve 140 according to this embodiment. The MSV (Main Stop Valve) differential pressure ratio 920a indicates the differential pressure ratio according to this embodiment. The generator output 930a indicates the output of the generator 300 according to the present embodiment. The reference generator output 940 is the value of the generator output 930a when the valve switching start signal is generated. The MSBV position 950 indicates the opening degree of the main steam stop small valve according to this embodiment. The differential pressure ratio threshold value 960 indicates a valve switching completion condition. When the differential pressure ratio 920a becomes equal to or less than the differential pressure ratio threshold value 960, the valve switching completion signal becomes valid.

  On the other hand, the LLM position 910b indicates the opening degree of the steam control valve according to the second technique described above. The MSV differential pressure ratio 920b indicates a differential pressure ratio according to the second technique. The generator output 930b indicates the generator output according to the second technique.

  According to the second technique, the throttle amount of the steam control valve is switched stepwise from high speed, medium speed, low speed, and fine speed according to the differential pressure ratio. On the other hand, the turbine control device 400 of the present embodiment calculates a target valve opening based on the differential pressure ratio, calculates a basic throttle amount based on the target valve opening, and performs basic throttle based on the generator output deviation. Correct the amount. Furthermore, the valve switching control of this embodiment increases the opening of the main steam stop small valve when the generator output deviation falls below a predetermined deviation threshold. Thereby, the fluctuation | variation of the generator output 930a of a present Example becomes smaller than the fluctuation | variation of the generator output 930b of a 2nd technique.

The techniques described in the above embodiments can also be expressed as follows.
(Expression 1)
A reference output storage unit that stores a reference output that is a reference value of the output of the generator connected to the turbine;
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And a differential pressure ratio calculation unit for calculating a differential pressure ratio of the second pressure,
An output difference calculation unit that obtains a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output;
A steam control valve controller that controls the opening of the steam control valve based on the differential pressure ratio and the output difference;
A turbine control device comprising:
(Expression 2)
The steam control valve control unit calculates a target opening of the steam control valve based on the differential pressure ratio, calculates a basic operation amount for adjusting the opening of the steam control valve to the target opening, An operation amount of the steam control valve opening is calculated by calculating a correction amount of the steam control valve opening based on a value obtained by multiplying the output difference by a predetermined ratio, and adding the correction amount to the basic operation amount. To calculate,
The turbine control device according to expression 1.
(Expression 3)
The steam control valve control unit calculates the basic operation amount by subtracting the target opening from the opening of the steam control valve, and calculates the output difference by subtracting the reference output from the measurement output. , Decrease the opening of the steam control valve by the manipulated variable,
The turbine control device according to expression 2.
(Expression 4)
The steam control valve control unit stores the relationship between the differential pressure ratio and the target opening, and uses the relationship to calculate the target opening according to the differential pressure ratio.
The turbine control device according to expression 3.
(Expression 5)
The reference output storage unit acquires the measurement output according to an instruction of the valve switching control and stores it as the reference output.
The turbine control device according to expression 4.
(Expression 6)
The steam control valve control unit limits a range of the correction amount based on the basic operation amount.
The turbine control device according to expression 5.
(Expression 7)
The main steam stop valve has a main steam stop small valve that adjusts the opening of a part of the main steam stop valve,
A main steam stop valve control unit for controlling an opening degree of the main steam stop small valve based on the output difference;
The turbine control device according to expression 6.
(Expression 8)
The main steam stop valve control unit increases the opening of the main steam stop small valve according to an increase in the absolute value of the output difference when the output difference is smaller than a predetermined output difference threshold value of 0 or less.
The turbine control device according to expression 7.
(Expression 9)
Stores the reference output, which is the reference value of the output of the generator connected to the turbine,
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And calculating the differential pressure ratio of the second pressure,
Obtaining a measurement output that is a measurement value of the output of the generator, calculating an output difference that is a difference between the reference output and the measurement output;
Based on the differential pressure ratio and the output difference, the degree of opening of the steam control valve is controlled.
A turbine control method comprising:

  The terms in the above expression will be described. The reference output storage unit corresponds to the holder 710 and the like. The output difference calculation unit corresponds to the subtracter 720 and the like. The steam control valve control unit corresponds to the control valve operation amount calculation unit 420, the control valve operation amount correction unit 440, and the like. The main steam stop valve control unit corresponds to the main steam stop valve control unit 450 and the like. The output difference corresponds to a generator output deviation or the like. The first operation amount corresponds to the basic narrowing amount and the like. The second operation amount corresponds to a correction amount or the like. The operation amount corresponds to the amount of narrowing down. The relationship between the differential pressure ratio and the target opening corresponds to the function 611 or the like.

  The present invention is not limited to the above embodiments, and can be modified in various other forms without departing from the spirit of the present invention.

100: Boiler, 110: Main steam stop valve pre-pressure detector, 120: Main steam stop valve, 130: Main steam stop valve post-pressure detector, 140: Steam control valve, 200: Turbine, 300: Generator, 400: Turbine controller, 410: differential pressure ratio calculation unit, 420: control valve operation amount calculation unit, 430: generator output deviation calculation unit, 440: control valve operation amount correction unit, 450: main steam stop valve control unit, 460: operation Time control unit, 470: fully open operation amount storage unit, 470: valve operation amount storage unit, 520: switching unit, 530: switching unit, 540: valve switching start determination unit, 550: valve switching completion determination unit

Claims (8)

A reference output storage unit that stores a reference output that is a reference value of the output of the generator connected to the turbine;
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And a differential pressure ratio calculation unit for calculating a differential pressure ratio of the second pressure,
An output difference calculation unit that obtains a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output;
A steam control valve controller that controls the opening of the steam control valve based on the differential pressure ratio and the output difference;
With
The steam control valve control unit calculates a target opening of the steam control valve based on the differential pressure ratio, calculates a basic operation amount for adjusting the opening of the steam control valve to the target opening, An operation amount of the steam control valve opening is calculated by calculating a correction amount of the steam control valve opening based on a value obtained by multiplying the output difference by a predetermined ratio, and adding the correction amount to the basic operation amount. To calculate,
Turbine control device. The steam control valve control unit calculates the basic operation amount by subtracting the target opening from the opening of the steam control valve, and calculates the output difference by subtracting the reference output from the measurement output. , Decrease the opening of the steam control valve by the manipulated variable,
The turbine control device according to claim 1 . The steam control valve control unit stores the relationship between the differential pressure ratio and the target opening, and uses the relationship to calculate the target opening according to the differential pressure ratio.
The turbine control device according to claim 2 . The reference output storage unit acquires the measurement output according to an instruction of the valve switching control and stores it as the reference output.
The turbine control device according to claim 3 . The steam control valve control unit limits a range of the correction amount based on the basic operation amount.
The turbine control device according to claim 4 . The main steam stop valve has a main steam stop small valve that adjusts the opening of a part of the main steam stop valve,
A main steam stop valve control unit for controlling an opening degree of the main steam stop small valve based on the output difference;
The turbine control device according to claim 5 . The main steam stop valve control unit increases the opening of the main steam stop small valve according to an increase in the absolute value of the output difference when the output difference is smaller than a predetermined output difference threshold value of 0 or less.
The turbine control device according to claim 6 . Stores the reference output, which is the reference value of the output of the generator connected to the turbine,
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And calculating the differential pressure ratio of the second pressure,
Obtaining a measurement output that is a measurement value of the output of the generator, calculating an output difference that is a difference between the reference output and the measurement output;
A target opening of the steam control valve is calculated based on the differential pressure ratio, a basic operation amount for adjusting the opening of the steam control valve to the target opening is calculated, and the output difference is multiplied by a predetermined ratio. A correction amount of the opening of the steam control valve is calculated based on the determined value, and an operation amount of the opening of the steam control valve is calculated by adding the correction amount to the basic operation amount, and the steam control valve Control the opening of
A turbine control method comprising:

Images