WO2022118854A1

WO2022118854A1 - Power generation system, control method for same, and program

Info

Publication number: WO2022118854A1
Application number: PCT/JP2021/043930
Authority: WO
Inventors: 孝裕竹友; 尚三田; 幸臣池田
Original assignee: 三菱重工業株式会社
Priority date: 2020-12-04
Filing date: 2021-11-30
Publication date: 2022-06-09
Also published as: TWI813086B; JP2022089316A; TW202242243A

Abstract

The purpose of the present invention is to provide a power generation system capable of increasing the output of a generator, a control method for the same, and a program. The power generation system comprises a boiler, a steam turbine that rotates using steam generated by the boiler, a generator that generates power by the rotation of the steam turbine, and a system controller (15) that controls the boiler. The system controller (15) comprises a correction-value setting unit (20) that calculates a correction value on the basis of a deviation (ΔMW) between a required generator output (MWD) and a generator output when a loading status is equal to or higher than a threshold value and changes of load are within a predetermined range, and a boiler control unit (40) that increases the required generator output (MWD) on the basis of the correction value and generates a boiler input direction (BID) as a direction for controlling the boiler.

Description

Power generation system, its control method and program

This disclosure relates to a power generation system, its control method, and a program.

In thermal power plants, etc., many power generation systems equipped with boilers and steam turbines as the main components are adopted. This power generation system uses steam generated by a boiler to generate electricity with a steam turbine.

Japanese Unexamined Patent Publication No. 11-182212 Japanese Unexamined Patent Publication No. 2018-185600

For example, in the summer, a phenomenon such as a decrease in the vacuum pressure of the condenser occurs as the outside air temperature rises. In such a case, the output of the generator tends to decrease (for example, Patent Document 1), and the output corresponding to the rated load may not be obtained. In addition, for example, the output may decrease due to aged deterioration of the device (for example, Patent Document 2). If the generator output is short-circuited in this way, it may not be possible to obtain a sufficient amount of power generation and the amount of power generation may be insufficient.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a power generation system capable of increasing the generator output, a control method thereof, and a program.

The first aspect of the present disclosure includes a boiler, a steam turbine that rotates using the steam generated by the boiler, a generator that generates electricity by the rotation of the steam turbine, and a system control device that controls the boiler. , The system control device calculates a correction value based on the deviation between the generator request output and the generator output when the load state is equal to or higher than the threshold value and the load change width is within a predetermined range. It is a power generation system including a setting unit and a boiler control unit that increases the generator request output based on the correction value and generates a boiler input command that is a command for controlling the boiler.

The second aspect of the present disclosure is a control method of a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates power by the rotation of the steam turbine, and is a load state. Is equal to or greater than the threshold value and the load change width is within a predetermined range, a step of calculating a correction value based on the deviation between the generator request output and the generator output, and the power generation based on the correction value. It is a control method including a step of increasing a machine request output and generating a boiler input command which is a command for controlling the boiler.

A third aspect of the present disclosure is a control program of a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates power by the rotation of the steam turbine, and is a load state. Is equal to or greater than the threshold value and the load change width is within a predetermined range, a process of calculating a correction value based on the deviation between the generator request output and the generator output, and the power generation based on the correction value. It is a control program for causing a computer to execute a process of increasing a machine request output and generating a boiler input command which is a command for controlling the boiler.

According to this disclosure, it has the effect of increasing the generator output.

It is a block diagram which roughly showed the whole structure of the power generation system which concerns on one Embodiment of this disclosure. It is a figure which showed an example of the hardware composition of the system control apparatus which concerns on one Embodiment of this disclosure. It is a figure which showed the schematic structure of the system control apparatus which concerns on one Embodiment of this disclosure. It is a flowchart which shows an example of the processing by the system control apparatus which concerns on one Embodiment of this disclosure. It is a figure for demonstrating the effect of the processing by the system control apparatus which concerns on one Embodiment of this disclosure.

Hereinafter, a power generation system according to an embodiment of the present invention and a control method thereof will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing the overall configuration of the power generation system 1 according to the present embodiment. In FIG. 1, the power generation system 1 controls a boiler 10, a steam turbine 3 that rotates using steam generated in the boiler 10, a generator 5 that generates electricity by the rotation of the steam turbine 3, and a steam turbine 3. It is provided with a control device 15. The boiler 10 can be applied not only to CFB but also to other types of boilers such as HRSG.
A furnace 2 for burning fuel is provided in the boiler 10. The steam generated in the water cooling wall 2'provided in the furnace 2 is supplied to the steam turbine 3 by the steam pipe L1. The steam pipe L1 is provided with a primary superheater 4a, a heater 16 and a secondary superheater 4b in series. Although FIG. 1 shows a case where one heater 16 is used, it may be further provided after the secondary superheater 4b.

The steam pipe L1 between the boiler 10 and the steam turbine 3 is provided with a steam control valve 6 for adjusting the amount of steam supplied to the steam turbine 3. When the complete transformer operation mode is adopted, the steam control valve 6 may be maintained in the fully open state regardless of the generator required output (power generation required output) MWD.

The power generation system 1 includes a water supply pump 8 that supplies water to the water cooling wall 2'provided in the furnace 2, a condenser 9 that collects steam discharged from the steam turbine 3 and returns it to water (liquid), and a condenser. It is provided with a pipe L2 or the like that guides the water generated in 9 to the water supply pump 8.

A pressure sensor 11 for measuring the main steam pressure is provided between the secondary superheater 4b and the steam control valve 6 in the steam pipe L1. The measured value of the pressure sensor 11 is output to the system control device 15 and used for controlling the steam turbine 3.

In the power generation system 1 having such a configuration, steam is generated by burning fuel in the fireplace 2 and activating the water supply pump 8 to circulate water through the water cooling wall 2'provided in the fireplace 2. Let me.
The steam generated in the water cooling wall 2'of the furnace 2 is guided to the primary superheater 4a and superheated, then cooled in the warmer 16 and reheated in the secondary superheater 4b. The steam reheated by the secondary superheater 4b is introduced into the steam turbine 3 and used to drive the steam turbine 3. The generator 5 generates electricity by the rotation of the steam turbine 3, and the generated electric power is sent to, for example, an electric power system (not shown).

The steam after driving the steam turbine 3 is guided to the condenser 9, and is returned to water (liquid) by the condenser 9. The water generated in the condenser 9 is returned to the water supply pump 8 again via various devices (not shown) provided in the pipe L2, and is reused in the boiler 10.

The system control device 15 controls the boiler 10 and the like.

FIG. 2 is a diagram showing an example of the hardware configuration of the system control device 15 according to the present embodiment.
As shown in FIG. 2, the system control device 15 is a computer system (computer system), for example, a CPU 110, a ROM (Read Only Memory) 120 for storing a program executed by the CPU 110, and execution of each program. It includes a RAM (Random Access Memory) 130 that functions as a work area at the time, a hard disk drive (HDD) 140 as a large-capacity storage device, and a communication unit 150 for connecting to a network or the like. As the large-capacity storage device, a solid state drive (SSD) may be used. Each of these parts is connected via a bus 180.

The system control device 15 may include an input unit including a keyboard, a mouse, and the like, a display unit including a liquid crystal display device for displaying data, and the like.

The storage medium for storing the program or the like executed by the CPU 110 is not limited to the ROM 120. For example, it may be another auxiliary storage device such as a magnetic disk, a magneto-optical disk, or a semiconductor memory.

A series of processing processes for realizing various functions described later is recorded in a hard disk drive 140 or the like in the form of a program, and the CPU 110 reads this program into the RAM 130 or the like to execute information processing / arithmetic processing. As a result, various functions described later are realized. The program may be installed in a ROM 120 or other storage medium in advance, provided in a state of being stored in a computer-readable storage medium, or distributed via a wired or wireless communication means. May be applied. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

FIG. 3 is a diagram showing a schematic configuration of the system control device 15. As shown in FIG. 3, the system control device 15 includes a correction value setting unit 20, a main steam pressure setting unit 30, a boiler control unit 40, and a governor control unit 50.

The correction value setting unit 20 calculates the correction value AM1 based on the deviation between the generator request output MWD and the generator output when the load state is equal to or higher than the threshold value and the load change width is within a predetermined range. .. Specifically, the correction value setting unit 20 holds the subtraction unit 21, the condition determination unit 22, the signal switching unit 23, the smoothing processing unit 24, the PI control unit 25, and the change rate limiting unit 26. A unit 27 and a signal switching unit 28 are provided.

The subtraction unit 21 calculates the deviation (difference) between the generator request output MWD and the actual output (generator output) and outputs it to the PI control unit 25. In the following description, the deviation is referred to as ΔMW. The deviation (ΔMW) is a value obtained by subtracting the actual output from the generator required output MWD.

The condition determination unit 22 determines the condition and outputs whether the condition is satisfied or not. For example, as shown in FIG. 3, a first condition, a second condition, and a third condition are set in the condition determination unit 22 (logical product). Only the first condition and the second condition may be used, or other conditions may be added. The condition determination unit 22 outputs that the condition is satisfied when all the set conditions are satisfied, and outputs that the condition is not satisfied if even one of the conditions is not satisfied.

The first condition is that the load state is equal to or higher than the threshold value. The threshold is set based on the rated load. Specifically, the threshold value is set near the rated load (for example, a value lower than the rated load by a predetermined margin). That is, the first condition determines that the load state is close to the rated load. For the load state, the generator required output MWD can be used. That is, the first condition can be that the generator request output MWD is equal to or higher than the preset threshold value β. In this way, under the first condition, it is determined that the rated load state is (or is close to).

The second condition is that the load change width (load change amount per predetermined time) is within a predetermined range. The predetermined range is preset as a range that can be regarded as a steady state with no load change. That is, ideally, it is determined that there is no load change (not under load change) under the second condition. The fact that the load is not changing may be determined, for example, by the absence of a load increase (change) request signal. The load increase request signal is the target load (generator output) remotely or manually by the operator when the required load of the power plant (generator request output MWD) is increased by the instruction from the central power supply command center. It is a signal that is input until it reaches. If there is no load increase request signal, it can be determined that there is no load change (the load change width is within a predetermined range).

The third condition is that the opening degree of the steam control valve 6 is equal to or higher than the threshold value α. Specifically, the third condition is that the opening degree of the steam control valve 6 is fully opened. Therefore, the threshold value α is set in advance to a value at which the steam control valve 6 can be determined to be fully open. The threshold value α may be set in consideration of a predetermined margin with respect to the fully open state.

In this way, the condition determination unit 22 determines that all the conditions are satisfied with the first condition, the second condition, and the third condition as the AND condition.

Further, as an additional condition (fourth condition), the condition determination unit 22 determines that the outside air temperature is equal to or higher than a predetermined value, and the deviation between the generator required output MWD and the generator output is equal to or higher than a predetermined value. At least one of them may be determined.

For example, when the outside air temperature is high in the summer, the generator output tends to be insufficient due to a decrease in the vacuum pressure of the condenser 9. That is, by determining that the outside air temperature is equal to or higher than a predetermined value, it is possible to determine the possibility of output shortage due to an increase in the outside air temperature. The threshold value is set in advance according to the relationship between the outside air temperature and the shortage amount of the generator output.

It is also possible to determine the output shortage in the summer by determining that the deviation between the generator required output MWD and the generator output is equal to or greater than a predetermined value. The predetermined value is set based on, for example, an acceptable value of the deviation between the generator required output MWD and the generator output. The phenomenon that the generator output is insufficient can occur regardless of the outside air temperature, for example, due to deterioration of equipment or the like. Therefore, by determining that the deviation between the generator required output MWD and the generator output is equal to or greater than a predetermined value, it is possible to determine that the generator output is insufficient regardless of the cause.

That is, it is more preferable that the condition determination unit 22 determines that all the conditions are satisfied with the first condition, the second condition, the third condition, and the fourth condition as the AND condition.

The signal switching unit 23 outputs either one of the selected port B1 and the selected port B2 to the output port C1 according to the input of the input port A1. Specifically, when a signal indicating that the condition is satisfied is input to the input port A1, the input to the selection port B1 is output to the output port C1. On the other hand, when a signal indicating that the condition is not satisfied is input to the input port A1, the input to the selection port B2 is output to the output port C1. That is, when the condition determination unit 22 determines that the condition is satisfied, ΔMW is output, and when the condition determination unit 22 determines that the condition is not satisfied, the signal generated by the signal generator (zero signal) is output. ..

The smoothing processing unit 24 performs smoothing processing on the signal from the signal switching unit 23. Specifically, the annealing processing unit 24 performs a change suppression process for suppressing a time change with respect to ΔMW, which is a deviation between the generator required output MWD and the actual output. Specifically, the change suppression process is performed by a moving average. That is, ΔMW is leveled. Even when a zero signal is input from the signal switching unit 23, the smoothing process is performed, but since the zero signal does not change with time, the input is output as it is.

In this way, the correction value setting unit 20 performs a change suppression process for suppressing the time change for ΔMW and calculates the correction value AM1 described later, so that a sudden time change of the calculated correction value AM1 is suppressed. To. That is, the time change of the correction value AM1 is also gradual, and the sudden generator output is suppressed.

The PI control unit 25 performs PI control based on the signal (that is, ΔMW) output from the smoothing processing unit 24, and outputs a control value. In the PI control unit 25, a lower limit value and an upper limit value are set. For example, the lower limit is 0 and the upper limit is a (> 0). By doing so, the control value is limited within the upper and lower limit range, and the range of the output value can be limited.

The change rate limiting unit 26 processes the control signal output from the PI control unit 25 so as to suppress the time change. This suppresses sudden changes over time in the control signal.

The holding unit 27 holds the value when the signal output from the rate of change limiting unit 26 reaches the actual MW target value. The actual MW target value is the rated output of the plant. That is, the actual MW target value is the maximum value of the output correction value AM1.

The signal switching unit 28 outputs either one of the selected port E1 and the selected port E2 to the output port F1 according to the input of the input port D1. Specifically, when a signal indicating that the condition is satisfied is input to the input port D1, the input to the selection port E1 is output to the output port F1. On the other hand, when a signal indicating that the condition is not satisfied is input to the input port D1, the input to the selection port E2 is output to the output port F1. That is, when the condition determination unit 22 determines that the condition is satisfied, the signal input from the holding unit 27 is output, and when the condition determination unit 22 determines that the condition is not satisfied, the signal generated by the signal generator ( Zero signal) is output.

In this way, the correction value AM1 is calculated based on ΔMW. The correction value AM1 is based on ΔMW, and the larger the ΔMW, that is, the smaller the actual output with respect to the generator required output MWD, the larger the value. The calculated correction value AM1 is output to the main steam pressure setting unit 30. When the condition is not satisfied and a zero signal is output from the signal switching unit 28, the correction value AM1 is zero and does not affect the subsequent stage.

The main steam pressure setting unit 30 sets the main steam pressure command CM2 based on the generator required output MWD and the correction value AM1. Therefore, the main steam pressure setting unit 30 includes a function unit 31 and an addition unit 32.

The function unit 31 converts the generator request output MWD to the main steam pressure command (before correction) CM1. That is, the function unit 31 performs conversion based on the relationship between the generator required output MWD set in advance based on the specifications of the power generation system 1 and the main steam pressure command CM1.

The addition unit 32 corrects the main steam pressure command CM1 by adding the correction value AM1 set by the correction value setting unit 20 to the main steam pressure command CM1 output from the function unit 31, and the main steam. The pressure command (after correction) CM2 is output. By doing so, the correction is made in the direction of increasing the main steam pressure command.

In this way, the main steam pressure command CM2 is generated in the main steam pressure setting unit 30. The generated main steam pressure command CM2 is output to the boiler control unit 40.

The boiler control unit 40 generates a boiler input command BID (Boiler Input Demand), which is a command for controlling the boiler 10. As will be described later, since the boiler control unit 40 uses the main steam pressure command CM2 reflecting the correction value AM1, a process of increasing the generator request output MWD is performed based on the correction value AM1. Specifically, the boiler control unit 40 increases the generator required output MWD based on the deviation between the main steam pressure command CM2 and the main steam pressure, and generates the boiler input command BID.

Therefore, the boiler control unit 40 includes a subtraction unit 41, a PI control unit 42, an addition unit 43, and a function unit 44.

The subtraction unit 41 calculates the deviation (difference) between the main steam pressure command CM2 and the main steam pressure (actual value), and outputs the deviation (difference) to the PI control unit 42. The deviation is the value obtained by subtracting the main steam pressure from the main steam pressure command CM2.

The PI control unit 42 performs PI control based on the signal output from the subtraction unit 41 (that is, the deviation between the main steam pressure command CM2 and the main steam pressure), and outputs the control value. This control value is based on the correction value AM1 output from the correction value setting unit 20, and is the correction value AM2 for the generator request output MWD.

The correction value AM2 for the generator required output MWD is based on the deviation between the main steam pressure command CM2 and the main steam pressure, and the smaller the main steam pressure with respect to the main steam pressure command CM2, the larger the value. In other words, since the main steam pressure command CM2 is calculated based on the correction value AM1 generated by the correction value setting unit 20, the correction value AM2 with respect to the generator request output MWD has a larger ΔMW, that is, power generation. The smaller the actual output with respect to the machine required output MWD, the larger the value.

The addition unit 43 corrects the generator request output MWD by adding the generator request output MWD to the control value (correction value AM2 for the generator request output MWD) output from the PI control unit 42. Since the correction value AM2 is added to the generator required output MWD, the generator required output MWD is corrected in an increasing direction.

The function unit 44 converts the corrected generator request output MWD output from the addition unit 43 into a boiler input command BID and outputs it. The boiler input command BID is used, for example, to create a fuel flow rate command in the fireplace 2 and a water supply flow rate command in the water cooling wall 2'. FIG. 3 shows a case where it is used for controlling a payout conveyor. If the boiler input command BID increases, the fuel flow rate command in the furnace 2 and the water supply flow rate command to the water cooling wall 2'will also increase, and as a result, the main steam pressure will rise. That is, the generator output will increase.

The boiler input command BID is not limited to the fuel flow command in the above-mentioned furnace 2 as long as it is a parameter that can increase the main steam pressure to increase the generator output.

The governor control unit 50 controls the opening degree of the steam control valve (governor) 6. Specifically, the subtraction unit 51 calculates the deviation between the generator request output MWD and the generator output, and the PI control unit 52 converts the difference into a control signal. By controlling the opening degree of the steam control valve 6 by this control signal, the opening degree adjustment control of the governor is performed so that the deviation between the generator required output MWD and the generator output becomes zero.

Next, an example of processing by the above-mentioned system control device 15 will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the procedure of the boiler input command output processing according to the present embodiment. The flow shown in FIG. 4 is repeatedly executed, for example, at a predetermined control cycle. In the flow of FIG. 4, a case where all of the first condition, the second condition, the third condition, and the fourth condition are used will be described, but even if the number of conditions is different, the same processing is performed.

First, it is determined whether or not the first condition is satisfied (S101). If the first condition is not satisfied (NO determination in S101), the process proceeds to S106.

When the first condition is satisfied (YES determination in S101), it is determined whether or not the second condition is satisfied (S102). If the second condition is not satisfied (NO determination in S102), the process proceeds to S106.

When the second condition is satisfied (YES determination in S102), it is determined whether or not the third condition is satisfied (S103). If the third condition is not satisfied (NO determination in S103), the process proceeds to S106.

When the third condition is satisfied (YES determination in S103), it is determined whether or not the fourth condition is satisfied (S104). If the fourth condition is not satisfied (NO determination in S104), the process proceeds to S106.

When the fourth condition is satisfied (YES determination in S104), the correction value AM1 is calculated based on the deviation between the generator request output MWD and the generator output (S105).

On the other hand, if at least one of the first condition, the second condition, the third condition, and the fourth condition is not satisfied, the correction value AM1 becomes zero (S106).

Next, the main steam pressure command CM2 is set based on the generator required output MWD and the correction value AM1 (S107). When the correction value AM1 is zero, the main steam pressure command CM2 is set simply based on the generator required output MWD.

Next, the correction value AM2 for the generator required output MWD is calculated based on the deviation between the main steam pressure command CM2 and the main steam pressure (S108).

Next, the generator request output MWD is corrected by the correction value AM2, and the boiler input command BID is output (S109).

In this way, especially when the load state is close to the rated load and there is no load fluctuation (the opening of the steam control valve 6 is fully open), and when the generator output is insufficient, the boiler is adjusted according to the correction value. Since the input command BID is corrected in the increasing direction, the output can be increased so as to make up for the output shortage.

Next, the effect of the processing by the system control device 15 described above will be described with reference to FIG. In FIG. 5, the A pattern and the B pattern are shown with the vertical axis (left axis) as the main steam pressure, the vertical axis (right axis) as the steam control valve opening degree, and the horizontal axis as the main steam flow rate. In the A pattern, the steam control valve 6 is fully opened and is constant. In the B pattern, the steam control valve 6 is variable.

When the generator required output MWD becomes high and reaches the point M, it becomes difficult to increase the generator output because the steam control valve 6 is fully open. Therefore, in the region above the point M, as the transformer operation region, the correction value is calculated and the correction is performed so as to increase the boiler input command BID as in the present embodiment. By doing so, the main steam pressure can be increased and the generator output can be increased. In this transformer operation region, the turbine is controlled by the generator output (the opening degree of the steam control valve 6 is constant), and the boiler 10 is controlled by the main steam pressure (corrected by ΔMW).

In this way, it is possible to correct the boiler input command BID to increase based on ΔMW and increase the generator output.

As described above, according to the power generation system according to the present embodiment, the control method thereof, and the program, in the power generation system 1 that generates power using the boiler 10 and the steam turbine 3, the load state is a high load equal to or higher than the threshold value. The correction value is calculated based on the generator request output and the generator output when there is no (small) load change in the state and the load change width is within a predetermined range. Then, the boiler input command BID is generated by increasing the generator request output MWD according to the correction value. Therefore, the boiler input command BID can be increased in a state where the load state is equal to or higher than the threshold value and the load change width is within a predetermined range. This makes it possible to increase the generator output.

In particular, when the load state is above the threshold value and the load change range is within the predetermined range, it is usually considered unnecessary to increase the generator output, but for some reason (for example, environmental change or equipment deterioration), the generator output is increased. Even if a shortage occurs, it is possible to cover the shortage.

By correcting the value based on the generator required output and the generator output, the difference between the generator required output and the generator output can be reduced. The boiler input command BID is generated based on the deviation between the main steam pressure command CM2 set by the generator required output MWD and the correction value, and the main steam pressure command CM2 while considering the correction value. The boiler input command BID is generated so as to suppress the difference between the main steam pressure and the main steam pressure.

The output can be increased when the outside air temperature is equal to or higher than a predetermined value or when the deviation between the generator required output MWD and the generator output is equal to or higher than a predetermined value. For example, when the outside air temperature is high in the summer, the output tends to be insufficient due to a decrease in the vacuum pressure of the condenser 9. Therefore, the shortage is covered by increasing the output according to the correction value.

The present disclosure is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention.

For example, in the above embodiment, when a request for load increase is input, the amount of fuel input to the furnace 2 and the amount of water supplied to the water cooling wall 2'are increased, but water is supplied rather than the responsiveness of the fuel in the furnace 2. Responsiveness is faster. Therefore, when the fuel flow rate command and the water supply flow rate command are increased at the same time, the amount of water supplied to the water cooling wall 2'first increases, and then the temperature inside the furnace 2 gradually starts to rise. Therefore, depending on the amount of water supplied to the water-cooled wall 2', the degree of superheat at the outlet of the water-cooled wall 2'may decrease. In order to avoid such a situation, a part of the water supply amount is bypassed to the water cooling wall 2'and supplied to the heater 16 installed on the steam outlet side of the primary superheater 4a and sprayed as a spray. May be good. In this case, in the warmer 16, the amount of spray increases.
By bypassing a part of the water supplied to the water-cooled wall 2'to the heater 16 in this way, it is possible to prevent the above-mentioned decrease in the outlet superheat degree of the water-cooled wall 2'.
When a warmer 16 is further provided on the steam outlet side of the secondary superheater 4b, the spray amount of each warmer 16 may be increased.

The power generation system described in each of the above-described embodiments, the control method thereof, and the program are grasped as follows, for example.
The power generation system (1) according to the present disclosure includes a boiler (10), a steam turbine (3) that rotates using the steam generated by the boiler, a generator that generates electricity by the rotation of the steam turbine, and the boiler. A system control device (15) for controlling is provided, and the system control device includes a generator required output (MWD) and power generation when the load state is equal to or higher than a threshold value and the load change width is within a predetermined range. A correction value setting unit (20) that calculates a correction value based on a deviation from the machine output, and a boiler input command that is a command for increasing the generator request output based on the correction value and controlling the boiler. A boiler control unit (40) that generates (BID) is provided.

According to the power generation system according to the present disclosure, in a power generation system that generates power using a boiler or a steam turbine, there is no high load state in which the load state is equal to or higher than the threshold value, and there is no load change in which the load change range is within a predetermined range ( When the condition is small), the correction value is calculated based on the generator request output and the generator output. Then, the boiler input command is generated by increasing the generator request output according to the correction value. Therefore, the boiler input command can be increased in a state where the load state is equal to or higher than the threshold value and the load change width is within a predetermined range. This makes it possible to increase the generator output.

By correcting the value based on the generator required output and the generator output, the difference between the generator required output and the generator output can be reduced.

The power generation system according to the present disclosure includes a main steam pressure setting unit (30) for setting a main steam pressure command based on the generator request output and the correction value, and the boiler control unit includes the main steam pressure command. The generator required output may be increased to generate the boiler input command based on the deviation between the steam pressure and the main steam pressure.

According to the power generation system according to the present disclosure, the correction value is taken into consideration by generating the boiler input command based on the deviation between the main steam pressure command and the main steam pressure set by the generator required output and the correction value. At the same time, a boiler input command is generated so as to suppress the difference between the main steam pressure command and the main steam pressure.

The power generation system according to the present disclosure includes a steam control valve (6) provided in a steam pipe connecting the boiler and the steam turbine, and the correction value setting unit has a load state equal to or higher than a threshold value and a load change. The correction value may be calculated when the width is within a predetermined range and the opening degree of the steam control valve is equal to or larger than the threshold value.

According to the power generation system according to the present disclosure, even when the opening degree of the steam control valve is equal to or larger than the threshold value and it is difficult to adjust the output increase by the steam control valve, the boiler input command is increased to increase the output. Is possible.

In the power generation system according to the present disclosure, the correction value setting unit is at least one of the cases where the outside air temperature is equal to or higher than a predetermined value and the deviation between the generator required output and the generator output is equal to or higher than a predetermined value. In the case of one, the correction value may be calculated.

According to the power generation system according to the present disclosure, the output can be increased when the outside air temperature is equal to or higher than a predetermined value or when the deviation between the generator required output and the generator output is equal to or higher than a predetermined value. For example, when the outside air temperature is high in summer, the output tends to be insufficient due to a decrease in the vacuum pressure of the condenser (9) or the like. Therefore, the shortage is covered by increasing the output according to the correction value.

In the power generation system according to the present disclosure, the correction value setting unit performs a change suppression process for suppressing a time change with respect to a deviation between the generator request output and the generator output, and calculates the correction value. May be good.

According to the power generation system according to the present disclosure, since the time change of the deviation between the generator request output and the generator output is suppressed, the time change of the correction value is also gradual, and the sudden generator output is suppressed.

In the power generation system according to the present disclosure, the correction value setting unit may perform the change suppression process by a moving average.

According to the power generation system according to the present disclosure, it is possible to effectively suppress the time change by the moving average.

The control method according to the present disclosure is a control method of a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates electricity by the rotation of the steam turbine, and is a load state. Is equal to or greater than the threshold value and the load change width is within a predetermined range, a step of calculating a correction value based on the deviation between the generator request output and the generator output, and the power generation based on the correction value. It includes a step of increasing the machine request output and generating a boiler input command which is a command for controlling the boiler.

The control program according to the present disclosure is a control program of a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates electricity by the rotation of the steam turbine, and is a load state. Is equal to or greater than the threshold value and the load change width is within a predetermined range, a process of calculating a correction value based on the deviation between the generator request output and the generator output, and the power generation based on the correction value. A process of increasing the machine request output and generating a boiler input command, which is a command for controlling the boiler, is performed by the computer.

1: Power generation system 2: Fire furnace 2': Water cooling wall 3: Steam turbine 4a: Primary superheater 4b: Secondary superheater 5: Generator 6: Steam control valve 8: Water supply pump 9: Water recovery device 10: Boiler 11: Pressure sensor 15: System control device 16: Boiler 20: Correction value setting unit 21: Subtraction unit 22: Condition determination unit 23: Signal switching unit 24: Smoothing processing unit 25: PI control unit 26: Change rate limiting unit 27 : Holding unit 28: Signal switching unit 30: Main steam pressure setting unit 31: Function unit 32: Addition unit 40: Boiler control unit 41: Subtraction unit 42: PI control unit 43: Addition unit 44: Function unit 50: Governor control unit 51: Subtraction unit 52: PI control unit 110: CPU
120: ROM
130: RAM
140: Hard disk drive 150: Communication unit 180: Bus A1: Input port AM1: Correction value AM2: Correction value B1: Selection port B2: Selection port BID: Boiler input command C1: Output port CM1: Main steam pressure command CM2: Main steam Pressure command D1: Input port E1: Selection port E2: Selection port F1: Output port L1: Steam piping L2: Piping MWD: Generator request output

Claims

With a boiler,
A steam turbine that rotates using the steam generated by the boiler,
A generator that generates electricity by rotating the steam turbine,
The system control device that controls the boiler and
Equipped with
The system control device is
A correction value setting unit that calculates a correction value based on the deviation between the generator request output and the generator output when the load state is equal to or higher than the threshold value and the load change width is within a predetermined range.
A boiler control unit that increases the generator request output based on the correction value and generates a boiler input command that is a command for controlling the boiler.
Power generation system equipped with.
A main steam pressure setting unit for setting a main steam pressure command based on the generator request output and the correction value is provided.
The power generation system according to claim 1, wherein the boiler control unit increases the generator required output based on the deviation between the main steam pressure command and the main steam pressure, and generates the boiler input command.
A steam control valve provided in a steam pipe connecting the boiler and the steam turbine is provided.
The correction value setting unit calculates the correction value when the load state is equal to or more than the threshold value, the load change width is within a predetermined range, and the opening degree of the steam control valve is equal to or more than the threshold value. The power generation system according to 1 or 2.
The correction value setting unit performs the correction when the outside air temperature is at least a predetermined value or when the deviation between the generator request output and the generator output is at least one of the predetermined values. The power generation system according to any one of claims 1 to 3 for calculating a value.
The correction value setting unit performs change suppression processing for suppressing a time change with respect to a deviation between the generator request output and the generator output, and calculates the correction value according to any one of claims 1 to 4. The power generation system described in.
The power generation system according to claim 5, wherein the correction value setting unit performs the change suppression process by a moving average.
It is a control method of a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates electricity by the rotation of the steam turbine.
A process of calculating a correction value based on the deviation between the generator request output and the generator output when the load state is equal to or higher than the threshold value and the load change width is within a predetermined range.
A step of increasing the generator request output based on the correction value and generating a boiler input command which is a command for controlling the boiler, and a step of generating the boiler input command.
Control method having.
A control program for a power generation system including a boiler, a steam turbine that rotates using the steam generated by the boiler, and a generator that generates electricity by the rotation of the steam turbine.
When the load state is equal to or greater than the threshold value and the load change width is within a predetermined range, the process of calculating the correction value based on the deviation between the generator request output and the generator output, and
A process of increasing the generator request output based on the correction value and generating a boiler input command which is a command for controlling the boiler.
A control program that allows a computer to execute.