JP2011117358A - Apparatus and method for controlling heat power plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable electric output to quickly change by controlling flow amount of turbine extraction. <P>SOLUTION: An apparatus includes: a normal electric output control means 16 that controls the electric output at normal times; an electric output control means 18 in adjusting steam extraction that controls the electric output in adjusting the steam extraction; a normal boiler pressure control means 15 that controls boiler pressure at normal times; a boiler pressure control means 17 in adjusting steam extraction that controls the boiler pressure in adjusting the steam extraction; a steam extraction adjustment decision means 20 that determines whether there is a steam adjustment instruction signal; and switching means 19a-19d that obtains the steam adjustment instruction signal, and switch the normal electric output control means 16 and the normal boiler pressure control means 15 into the electric output control means 18 in adjusting steam extraction and the boiler pressure control means 17 in adjusting steam extraction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thermal power plant control apparatus and method for generating an electrical output according to a power demand provided from an external power system.

  Generally, the thermal power plant control method has a configuration that takes into account the internal response of the thermal power plant in order to generate an electrical output (MW output) in accordance with an electric power demand (command value). Specifically, in a normal thermal power plant composed of a drum-type boiler and a turbine, in many cases, a control circuit for setting a boiler pressure and a control circuit for setting an electric output are installed. Each flow rate, each temperature, etc. are controlled according to the circuit.

  Due to increasing interest in environmental issues in recent years, power systems have been installed with power sources that use natural energy as an energy source. However, it is difficult to adjust the electrical output of wind power or solar power generation. Therefore, improvement of the stability of the electric power system has become a problem, and a method for rapidly changing the output of the thermal power plant is being studied. In other words, load changes such as wind power and solar power generation can be balanced by controlling using a thermal power plant, and stabilization of the power system can be improved.

  As a conventional technique, there is one described in Patent Document 1, for example. This technology proposes a control apparatus for a bleed condensate turbine that is provided with means for increasing or decreasing the extraction flow rate in response to fluctuations in power demand and that absorbs fluctuations in power demand by increasing or decreasing the extraction flow rate.

  By the way, although the technique described in patent document 1 is increasing / decreasing the extraction flow so that the fluctuation | variation of several hours unit of electric power demand (refer FIG. 3 of the literature) is adjusted, this extraction flow increase / decrease method is several. It is not considered to compensate for the stabilization of the power system with natural energy that changes in minutes.

  On the other hand, even in a conventional power system, it is necessary to perform stabilization control corresponding to a sudden load change in the case of a low load such as at night. In the technique described in Patent Document 2, the problem is solved by storing steam. I am trying. Specifically, in the technique described in Patent Document 2, steam is stored in an accumulator (steam puddle) using turbine bleed air at low loads such as at night, and is used for power generation by shutting off bleed as necessary. A method for increasing the load rapidly by increasing the steam flow rate is disclosed. However, it is not realistic to put such a large accumulator as described above, and it has not been put into practical use.

  Therefore, in the past, studies have been made to control the electrical output of a thermal power plant by shutting off or controlling turbine bleed used for feed water heating. In the technique described in Patent Document 3, a response method of electric output by this extraction control is disclosed.

JP-A-4-54204 JP-A-8-260907 US Pat. No. 6,134,891

  However, the technique described in Patent Document 3 described above merely discloses a method of changing the output by controlling the bleed air, and is a control for realizing in consideration of the influence of a complicated thermal power plant. No method is disclosed.

  An object of this invention is to provide the thermal plant control apparatus and method which can change an electrical output rapidly by controlling a turbine bleed flow rate.

  In order to achieve the above object, a thermal power plant control apparatus according to the present invention includes a normal-time electric output control means for controlling an electric output at normal time, and an extraction-adjustment-time electric output control means for controlling the electric output at the time of extraction adjustment. The normal boiler pressure control means for controlling the boiler pressure at the normal time, the boiler pressure control means at the time of extraction adjustment for controlling the boiler pressure at the time of the extraction adjustment, the extraction adjustment determination means for determining the presence or absence of the extraction adjustment command signal, Switching means for obtaining a bleed adjustment command signal and switching the normal-time electric output control means and the normal-time boiler pressure control means to the bleed-adjustment-time electric output control means and the bleed-adjustment-time boiler pressure control means. Features.

  The thermal power plant control device according to the present invention includes an electrical output control means for controlling electrical output, a boiler pressure control means for controlling boiler pressure, an extraction adjustment determination means for determining whether or not extraction adjustment is performed, and the extraction adjustment. Switching means for obtaining a signal indicating presence / absence of the switch and switching control parameters of the electrical output and the boiler pressure.

  In order to achieve the above object, the thermal power plant control method according to the present invention, when the extraction adjustment command signal obtained in the extraction adjustment determination step and the extraction adjustment determination step for determining the presence or absence of the extraction adjustment command signal, A normal-time electric output control means for controlling the normal-time electric output and a normal-time boiler pressure control means for controlling the normal-time boiler pressure are used for the extraction adjustment. And a switching step for switching to the pressure control means.

  Further, the thermal power plant control method according to the present invention controls an extraction adjustment determination step for determining the presence or absence of an extraction adjustment command signal, an electric output control means for controlling an electric output and a boiler pressure after the extraction adjustment determination step. And a switching step for switching each control parameter of the boiler pressure control means.

  According to the present invention, by controlling the turbine bleed flow rate, it is possible to rapidly change the electrical output and stabilize the power system.

1 is a system diagram showing a basic configuration of a thermal power plant to which the present invention is applied. It is a block diagram which shows 1st Embodiment of the thermal power plant control apparatus which concerns on this invention. It is a block diagram which shows the extraction adjustment judgment circuit of 1st Embodiment. It is a block diagram which shows 2nd Embodiment of the thermal power plant control apparatus which concerns on this invention. It is a block diagram which shows 3rd Embodiment of the thermal power plant control apparatus which concerns on this invention. It is a block diagram which shows the extraction adjustment judgment circuit of 3rd Embodiment. It is a block diagram which shows 4th Embodiment of the thermal power plant control apparatus which concerns on this invention. It is a block diagram which shows the extraction adjustment judgment circuit of 4th Embodiment.

  First, a basic configuration of a thermal power plant to which each embodiment of the present invention is applied will be described with reference to FIG.

  As shown in FIG. 1, the boiler 1 is a drum boiler, and includes a economizer 2, a superheater 3, a spray pipe 4, and the like. The feed water to the boiler 1 is heated from the saturation temperature to a slightly lower temperature in the economizer 2, and further heated in the drum 1a of the boiler 1 to evaporate. In addition, the feed water to the economizer 2 is supplied from the condenser 5 and heated by extraction from the low pressure turbine 9 and the high pressure turbine 10 via the low pressure feed water heater 6, the deaerator 7 and the high pressure feed water heater 8. Is done.

  On the other hand, the main steam output from the boiler 1 is heated by the superheater 3. The boiler steam temperature is controlled by water ejected from the spray pipe 4. The main steam flow rate is controlled by the main steam valve 11 and is sent to the high-pressure turbine 10 according to the power demand. In this high pressure turbine 10, after working, a part is sent to the bleed air and the rest is reheated by the reheater 12. Thereafter, the work is further performed in the low-pressure turbine 9 and condensed in the condenser 5. The condensed condensate is heated by the low-pressure feed water heater 6 and the high-pressure feed water heater 8 and sent to the boiler 1 again. The generator 13 is driven by the power generated when the high-pressure turbine 10 and the low-pressure turbine 9 work.

  Here, the extraction flow rate is designed to be most efficient in the entire thermal power plant. Since the extracted air is extracted from an intermediate stage of the low-pressure turbine 9 and the high-pressure turbine 10, the extracted air does not contribute to the work of the low-pressure turbine 9 and the high-pressure turbine 10 after the extraction. For this reason, when the inlet steam flow rate and pressure of the low-pressure turbine 9 and the high-pressure turbine 10 are constant, if the extraction flow rate is increased, the electrical output decreases.

  Conversely, when the turbine bleed is controlled and cut off or reduced, the amount of steam working in the low-pressure turbine 9 and the high-pressure turbine 10 increases, thus increasing the electrical output. Thus, the electrical output can be changed by controlling the extraction flow rate.

  Hereinafter, each embodiment of the thermal power plant control device according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 is a block diagram showing a first embodiment of a thermal power plant control apparatus according to the present invention. FIG. 3 is a block diagram illustrating the extraction adjustment determination circuit of the first embodiment. In FIG. 2, the switching signal is indicated by a broken line arrow, and a control signal such as a command value is indicated by a solid line arrow. The same applies to FIG. 4, FIG. 5, and FIG.

  As described above, the thermal power plant control device is configured in consideration of the internal response of the thermal power plant in order to generate a predetermined electrical output. In a normal thermal power plant composed of a drum-type boiler and a turbine, in many cases, a boiler pressure control circuit 15 serving as a normal boiler pressure control means for setting the pressure of the boiler 1 and a normal time for setting an electric output at a normal time. An electrical output control circuit 16 as an electrical output control means is installed, and each flow rate, each temperature, and the like are controlled according to these control circuits 15 and 16.

  The boiler pressure control circuit 15 for setting the boiler pressure and the electric output control circuit 16 for setting the electric output are adjusted so as to simulate the plant operation. However, since the operation of the plant differs when the bleed flow rate changes, there are cases where the conventional control circuit for setting the boiler pressure and control circuit for setting the electrical output cannot stably control the entire plant.

  Therefore, in the present embodiment, the bleed adjustment boiler pressure control circuit 17 and the bleed adjustment electrical output control circuit 18 are provided separately. That is, the bleed adjustment boiler pressure control circuit 17 and the bleed adjustment electric output control circuit 18 are connected in parallel to the boiler pressure control circuit 15 and the electric output control circuit 16 for setting the electric output, respectively. The boiler pressure control circuit 15 and the electrical output control circuit 16 for setting the electrical output, the bleed adjustment boiler pressure control circuit 17 and the bleed adjustment electrical output control circuit 18 are switched by four switches 19a to 19d as switching means. It is done.

  The four switches 19a to 19d are switched by a switching signal from an extraction adjustment determination circuit 20 described later. An extraction-adjustment boiler pressure control circuit 17 or boiler pressure control circuit 15 receives an analog signal of an electrical output command value from an external power system via a switch 19a. Similarly, an analog signal of an electrical output command value from an external power system is input to the electrical output control circuit 16 or the electrical output control circuit 18 at the time of bleed adjustment through a switch 19c.

  On the other hand, the boiler pressure set value signal from the boiler pressure control circuit 15 or the bleed adjustment boiler pressure control circuit 17 is output to the turbine control circuit 30 and the boiler control circuit 31 via the switch 19b. The electrical output set value signal from the electrical output control circuit 16 or the electrical output control circuit 18 at the time of extraction adjustment is output to the turbine control circuit 30 and the boiler control circuit 31 through the switch 19d. Here, the turbine control circuit 30 controls electrical output, pressure, and the like, and the boiler control circuit 31 controls steam temperature, steam flow rate, and the like.

  In the present embodiment, based on an electrical output command value signal given from an external power system such as a normal power plant, the extraction adjustment determination circuit 20 determines whether output adjustment by extraction control is necessary or unnecessary.

  FIG. 3 is a block diagram illustrating the extraction adjustment determination circuit of the first embodiment.

  When the extraction adjustment determination circuit 20 determines that extraction is necessary, the extraction adjustment circuit 21 calculates the extraction setting value and outputs the extraction amount setting value signal to the extraction control circuit 22. The bleed control circuit 22 performs bleed control based on the bleed amount set value signal.

  As shown in FIG. 3, the bleed adjustment determination circuit 20 determines that bleed is necessary when the rate of change of the electrical output command value is equal to or greater than a certain value (for example, 10% of the rated output per minute). 1 "is output. When the change rate of the electrical output command value is less than a certain value and extraction is not necessary, a digital signal “0” is output.

  Specifically, the extraction adjustment determination circuit 20 includes a change rate extraction circuit 23 and a threshold processing circuit 24. The change rate extraction circuit 23 extracts the change rate from the value of the electrical output command value signal. The threshold processing circuit 24 performs threshold processing on the change rate extracted by the change rate extraction circuit 23 and the electrical output change rate threshold.

  Next, the operation of this embodiment will be described.

  As illustrated in FIG. 3, the extraction adjustment determination circuit 20 uses an electrical output command value signal as an input signal. The change rate extraction circuit 23 extracts the change rate from the electrical output command value signal. The threshold processing circuit 24 compares the change rate extracted by the change rate extraction circuit 23 with a predetermined electrical output change rate threshold value by threshold processing, and outputs a digital signal “1” if it exceeds the threshold value. If not, a digital signal “0” is output.

  When it is determined by the extraction adjustment determination circuit 20 that extraction is necessary and a switching signal is output to the switches 19a and 19b as the extraction command signal “1”, the switches 19a and 19b are switched from the boiler pressure control circuit 15 to the boiler at the time of extraction adjustment. It switches to the pressure control circuit 17, and the boiler pressure set value signal adjusted for the plant in which extraction is performed is output to the turbine control device 30 and the boiler control circuit 31.

  Similarly, regarding the electrical output control circuit 16, when it is determined that extraction is necessary and a switching signal is output to the switches 19 c and 19 d as the extraction command signal “1”, the switches 19 c and 19 d are switched from the electrical output control circuit 16. The electrical output control circuit 18 is switched to the bleed adjustment electric output control circuit 18, and the electrical output set value signal adjusted for the plant where the bleed is being performed is output to the turbine control device 30 and the boiler control circuit 31.

  At this time, if it is determined that bleed is necessary and the bleed command signal “1” is output, the bleed adjustment circuit 21 calculates the bleed amount and controls the bleed control circuit 22.

  The extraction control circuit 22, the turbine control circuit 30, and the boiler control circuit 31 operate with all or a part of the extraction amount set value, boiler pressure set value, and electrical output set value obtained in this way as input signals. The extraction amount, turbine, and boiler are controlled respectively.

  According to this embodiment described above, by controlling the turbine bleed flow rate, it is possible to rapidly change the electric output and stabilize the power system.

  In the present embodiment, the boiler pressure control circuit 15 and the electrical output control circuit 16 are described as examples that are completely separate circuits. However, the boiler pressure control circuit 15 and the electrical output control circuit 16 refer to each other's outputs. You may do it.

(Second Embodiment)
FIG. 4 is a block diagram showing a second embodiment of the thermal power plant control apparatus according to the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the structure of the said 1st Embodiment, or the description is abbreviate | omitted. The same applies to other embodiments.

  In the first embodiment, based on an electrical output command value signal given from an external power system such as a normal power plant, the extraction adjustment determination circuit 20 determines whether output adjustment by extraction control is necessary or unnecessary. However, in this embodiment, as shown in FIG. 4, the designation signal for the presence / absence of the bleed adjustment is directly obtained from the outside, and the bleed adjustment is determined.

  Specifically, the extraction presence / absence designation signal for the presence / absence of extraction is performed outside the thermal power plant and the determination of extraction adjustment is transmitted to the thermal power plant control device of the present embodiment. A signal “1” or “0” is received. Here, when there is bleed, the digital signal “1” is output, and when there is no bleed, the digital signal “0” is output.

  Next, the operation of this embodiment will be described.

  By receiving the extraction presence / absence designation signal, the switches 19a and 19b are switched from the boiler pressure control circuit 15 to the boiler pressure control circuit 17 during extraction adjustment, and the boiler pressure adjusted for the plant where extraction is being performed. A set value signal is output to the turbine control device 30 and the boiler control circuit 31.

  Similarly, the electrical output control circuit 16 also receives the extraction presence / absence designation signal, so that the switches 19c and 19d are switched from the electrical output control circuit 16 to the electrical output control circuit 18 at the time of extraction adjustment, and extraction is performed. The electric output set value signal adjusted for the plant being operated is output to the turbine control device 30 and the boiler control circuit 31.

  The extraction control circuit 22, the turbine control circuit 30, and the boiler control circuit 31 operate with all or a part of the extraction amount set value, boiler pressure set value, and electrical output set value obtained in this way as input signals. The extraction amount, turbine, and boiler are controlled respectively.

  According to the present embodiment described above, by controlling the turbine bleed flow rate as in the first embodiment, it is possible to rapidly change the electrical output and stabilize the power system. Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted.

(Third embodiment)
FIG. 5 is a block diagram showing a third embodiment of the thermal power plant control apparatus according to the present invention. FIG. 6 is a block diagram showing an extraction adjustment determination circuit according to the third embodiment.

  The present embodiment is an embodiment in which the extraction adjustment determination is performed using the system frequency as an input. As shown in FIGS. 5 and 6, the bleed adjustment determination circuit 20 determines that bleed is necessary when the rate of change of the system frequency is equal to or higher than a certain value (for example, 1 [Hz] of the rated output for 5 seconds). The digital signal “1” is output. When the rate of change of the system frequency is less than a certain value and extraction is unnecessary, “0” is output.

  Specifically, the extraction adjustment determination circuit 20 includes a change rate extraction circuit 23 and a threshold processing circuit 24. The change rate extraction circuit 23 extracts the change rate of the system frequency. The threshold processing circuit 24 performs threshold processing on the change rate of the system frequency extracted by the change rate extraction circuit 23 and the system frequency change rate threshold.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 6, the extraction adjustment determination circuit 20 uses the system frequency as an input signal, and extracts the change rate of the system frequency by the change rate extraction circuit 23. The threshold processing circuit 24 compares the change rate of the system frequency extracted by the change rate extraction circuit 23 with the system frequency change rate threshold value by threshold processing, and when the change rate of the system frequency is equal to or greater than a certain value, the digital signal “1”. When the rate of change of the system frequency is less than a certain value, a digital signal “0” is output.

  When the bleed adjustment determination circuit 20 determines that bleed is necessary, the boiler pressure control circuit 15 switches to the bleed adjustment boiler pressure control circuit 17, and the boiler pressure setting adjusted for the plant where bleed is being performed. A value signal is output to the turbine control device 30 and the boiler control circuit 31.

  Similarly, when it is determined that extraction is necessary for the electrical output control circuit 16, the electrical output control circuit 16 switches to the electrical output control circuit 18 at the time of extraction adjustment, and is adjusted for the plant where extraction is performed. The electrical output set value signal is output to the turbine control device 30 and the boiler control circuit 31.

  At this time, if it is determined that the bleed is necessary and the bleed command signal “1” is output, the bleed adjustment circuit 21 calculates the bleed set value and controls the bleed control circuit 22.

  According to the present embodiment described above, by controlling the turbine bleed flow rate as in the first embodiment, it is possible to rapidly change the electrical output and stabilize the power system. Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted.

(Fourth embodiment)
FIG. 7 is a block diagram showing a fourth embodiment of the thermal power plant control apparatus according to the present invention. FIG. 8 is a block diagram showing an extraction adjustment determination circuit according to the fourth embodiment.

  The present embodiment is an embodiment in which the bleed adjustment is determined using an actual electrical output value and an external electrical output command value as input signals. As shown in FIGS. 7 and 8, the bleed adjustment determination circuit 20 has a rate of change of an error between an actual electrical output value and an external electrical output command value equal to or greater than a certain value (for example, 30 [MW of rated output in 30 seconds). ], The digital signal “1” is output. When the rate of change of the error is less than a certain value and extraction is not necessary, a digital signal “0” is output.

  Specifically, the extraction adjustment determination circuit 20 includes a subtraction circuit 25, a change rate extraction circuit 23, and a threshold processing circuit 24. The subtraction circuit 25 subtracts the external electrical output command value from the actual electrical output value. The change rate extraction circuit 23 extracts the change rate of the output error. The threshold processing circuit 24 performs threshold processing on the output error change rate and the output error change rate threshold extracted by the change rate extraction circuit 23.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 8, when the extraction adjustment determination circuit 20 determines that extraction is necessary when the rate of change in the error between the actual electrical output value and the external electrical output command value is equal to or greater than a certain value, The control circuit 15 switches to the boiler pressure control circuit 17 at the time of bleed adjustment, and the boiler pressure set value signal adjusted for the plant where bleed is being performed is output to the turbine controller 30 and the boiler control circuit 31.

  Similarly, when it is determined that extraction is necessary for the electrical output control circuit 16, the electrical output control circuit 16 switches to the electrical output control circuit 18 at the time of extraction adjustment, and is adjusted for the plant where extraction is performed. The electrical output set value signal is output to the turbine control device 30 and the boiler control circuit 31.

  At this time, if it is determined that the bleed is necessary and the bleed command signal “1” is output, the bleed adjustment circuit 21 calculates the bleed set value and controls the bleed control circuit 22.

  According to the present embodiment described above, by controlling the turbine bleed flow rate as in the first embodiment, it is possible to rapidly change the electrical output and stabilize the power system. Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted.

  In the first to fourth embodiments, the boiler pressure control circuit 15 and the electrical output control circuit 16 are switched to the bleed adjustment boiler pressure control circuit 17 and the bleed adjustment electrical output control circuit 18, respectively, and the circuit itself is switched. However, the control adjustment parameters in the boiler pressure control circuit 15 and the electric output control circuit 16 may be switched when the electric output command value signal is input.

  In the first to fourth embodiments, the circuits are switched by the switches 19a to 19d. However, the whole or a part of the circuits can be assembled by a program. In this case, the switches 19a to 19d are Therefore, it is replaced with a judgment sentence (switching means such as an IF sentence) on the program.

DESCRIPTION OF SYMBOLS 1 ... Boiler 9 ... Low pressure turbine 10 ... High pressure turbine 15 ... Boiler pressure control circuit (normal boiler pressure control means, boiler pressure control means)
16 ... Electric output control circuit (normal electric output control means, electric output control means)
17 ... Boiler pressure control circuit during bleed adjustment (Boiler pressure control means during bleed adjustment)
18 ... Electric output control circuit during bleed adjustment (electric output control means during bleed adjustment)
19a to 19d ... switch (switching means)
20 ... Extraction adjustment determination circuit (extraction adjustment determination means)
21 ... Extraction adjustment circuit 22 ... Extraction control circuit 23 ... Change rate extraction circuit 24 ... Threshold processing circuit 25 ... Subtraction circuit 30 ... Turbine control circuit 31 ... Boiler control circuit

Claims (8)

Normal electric output control means for controlling the normal electric output;
An electrical output control means at the time of bleed adjustment for controlling the electrical output at the time of bleed adjustment;
Normal boiler pressure control means for controlling the normal boiler pressure;
Boiler pressure control means for controlling the boiler pressure during bleed adjustment,
Bleed adjustment determination means for determining the presence or absence of a bleed adjustment command signal;
Switching means for obtaining the bleed adjustment command signal and switching the normal-time electric output control means and the normal-time boiler pressure control means to the bleed-adjustment-time electric output control means and the bleed-adjustment-time boiler pressure control means;
A thermal power plant control device comprising: Electrical output control means for controlling electrical output;
Boiler pressure control means for controlling the boiler pressure;
Bleed adjustment determination means for determining the presence or absence of bleed adjustment;
Switching means for obtaining a signal indicating the presence or absence of the bleed adjustment and switching the control parameter of the electrical output and the boiler pressure;
A thermal power plant control device comprising: The bleed adjustment determination means determines output adjustment by bleed control based on the rate of change of the electrical output command value;
The thermal power plant control device according to claim 1, wherein The bleed adjustment determination means performs an output adjustment determination by bleed control based on a designation signal for the presence or absence of bleed adjustment from the outside,
The thermal power plant control device according to claim 1, wherein The bleed adjustment determination means performs determination of output adjustment by bleed control based on the rate of change of the system frequency,
The thermal power plant control device according to claim 1, wherein The bleed adjustment determination means determines the output adjustment by the bleed control based on the change rate of the error between the actual electrical output value and the external electrical output command value.
The thermal power plant control device according to claim 1, wherein A bleed adjustment determination step for determining the presence or absence of a bleed adjustment command signal;
When the extraction adjustment command signal is obtained in the extraction adjustment determination step, the normal-time electric output control means for controlling the normal-time electric output and the normal-time boiler pressure control means for controlling the normal-time boiler pressure are set during the extraction adjustment. A switching step for switching to an electrical output control means for bleed adjustment used and a boiler pressure control means for bleed adjustment used during bleed adjustment;
The thermal power plant control method characterized by having. A bleed adjustment determination step for determining the presence or absence of a bleed adjustment command signal;
When the extraction adjustment command signal is obtained in the extraction adjustment determination step, a switching step of switching the control parameters of the electric output control means for controlling the electric output and the boiler pressure control means for controlling the boiler pressure,
The thermal power plant control method characterized by having.

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