WO2021166575A1

WO2021166575A1 - Power adjustment system, electricity generation plant, power adjustment method, and power adjustment program

Info

Publication number: WO2021166575A1
Application number: PCT/JP2021/002872
Authority: WO
Inventors: 和宏堂本; 誠當房; 雄一朗古川; 和貴小原
Original assignee: 三菱パワー株式会社
Priority date: 2020-02-20
Filing date: 2021-01-27
Publication date: 2021-08-26
Also published as: JP2021132489A

Abstract

The purpose of the present invention is to provide a power adjustment system, an electricity generation plant, a power adjustment method, and a power adjustment program with which frequency fluctuation in a power grid can be more effectively minimized. A power adjustment system (60) comprises a determination unit (66) that determines whether or not a load change amount requested of an electricity generation plant is equal to or greater than a preset threshold value due to fluctuation in the amount of power supply/demand in the power grid, and a supply control unit (67) that supplies power generated by the electricity generation plant and/or power from the power grid to equipment able to consume power in the electricity generation plant.

Description

Power regulation system and power plant, power adjustment method, and power adjustment program

This disclosure relates to a power adjustment system and a power plant, a power adjustment method, and a power adjustment program.

A large boiler such as a thermal power plant has a hollow furnace that is installed in the vertical direction, and a plurality of combustion burners are arranged along the circumferential direction of the furnace on the furnace wall. In a large boiler, a flue is connected vertically above the furnace, and a heat exchanger for generating steam is placed in this flue. Then, the combustion burner injects a mixture of fuel and air (oxidizing gas) into the furnace to form a flame, and combustion gas is generated and flows into the flue. A heat exchanger is installed in the area where the combustion gas flows, and superheated steam is generated by heating the water or steam flowing in the heat transfer tube constituting the heat exchanger.

In this way, the power plant uses a boiler or the like to generate power and output it to the power system. In the power system, if an imbalance between power supply (supply) and power consumption (demand) occurs, frequency fluctuations occur. Therefore, in the power plant, the opening of the governor valve of the steam turbine is controlled to adjust the output. The frequency fluctuation of the electric power system is stabilized (for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Japanese Patent No. 5550746 Japanese Unexamined Patent Publication No. 2001-286602 Japanese Patent No. 4453858

In recent years, while the number of power generation facilities that use regenerated energy such as wind power generation and solar power generation has increased, the amount of power supply to these facilities tends to fluctuate from moment to moment, and there is a problem in the stable supply of power. Even when power generation equipment using regenerated energy and a thermal power plant are interconnected in the power system to supply power, the ratio of the power supply amount by the regenerated energy increases and the fluctuation of the power supply amount by the regenerated energy If the power exceeds the permissible value in the power system, the frequency of the power system may fluctuate and it may not be possible to stably supply the power with ensured quality to the power demand destination. If the frequency fluctuation of the power system becomes larger, the power plant may drop out from the power system and a large-scale power outage (blackout) may occur. Therefore, stabilizing the frequency in the power system is an important issue. For this reason, there is a need for an operation or mechanism that more flexibly adjusts fluctuations in the amount of power supply (frequency fluctuations in the power system).

The present disclosure has been made in view of such circumstances, and includes a power adjustment system and a power plant capable of more effectively suppressing frequency fluctuations of a power system, a power adjustment method, and a power adjustment program. The purpose is to provide.

The first aspect of the present disclosure is a determination unit for determining whether or not the load change amount required for the power plant is equal to or higher than a preset threshold value due to fluctuations in the supply and demand power amount of the power system, and the load change amount is described above. A power adjustment system including a supply control unit that supplies at least one of the power generated by the power plant and the power from the power system to a device capable of consuming the power in the power plant when the value is equal to or higher than the threshold value. be.

The second aspect of the present disclosure is a step of determining whether or not the load change amount required for the power plant is equal to or more than a preset threshold value due to fluctuations in the supply and demand power amount of the power system, and the load change amount is the threshold value. In the above case, it is a power adjustment method including a step of supplying at least one of the power generated by the power plant and the power from the power system to a device capable of consuming the power in the power plant.

The third aspect of the present disclosure is a process of determining whether or not the load change amount required for the power plant is equal to or more than a preset threshold value due to fluctuations in the supply and demand power amount of the power system, and the load change amount is the threshold value. In the above case, the power adjustment for causing the computer to execute the process of supplying at least one of the power generated by the power plant and the power from the power system to the equipment capable of consuming the power in the power plant. It is a program.

According to the present disclosure, the effect is that the frequency fluctuation of the electric power system can be suppressed more effectively.

It is a schematic block diagram which shows the coal-fired boiler which concerns on one Embodiment of this disclosure. It is the schematic which shows the steam, condensate, and water supply system in the coal-fired boiler which concerns on one Embodiment of this disclosure. It is a conceptual diagram of the electric power system which concerns on one Embodiment of this disclosure. This is a configuration example of a power plant according to an embodiment of the present disclosure. It is a figure which showed an example of the hardware composition of the control device which concerns on one Embodiment of this disclosure. It is a functional block diagram which showed the function which the control device which concerns on one Embodiment of this disclosure has. It is a figure which shows the correspondence between the required power supply amount and each component which concerns on one Embodiment of this disclosure. It is a figure concerning the drop control which concerns on one Embodiment of this disclosure. It is a figure which shows the relationship between the load change width and load change period which concerns on one Embodiment of this disclosure. It is a figure which shows the relationship between the load change width, the load change cycle, and the threshold value which concerns on one Embodiment of this disclosure. It is a figure which shows the configuration example about the compressor and the receiver which concerns on one Embodiment of this disclosure. It is a figure which shows the structural example about the boiler water supply pump which concerns on one Embodiment of this disclosure. It is a figure which shows the time variation of the water supply flow rate which concerns on one Embodiment of this disclosure. It is a figure which showed the water supply flow rate when the T-BFP and M-BFP which concerns on one Embodiment of this disclosure are operated in parallel. It is a figure which shows the installation example of the heat pump which concerns on one Embodiment of this disclosure. It is a figure which shows the setting example of the water feed pump which concerns on one Embodiment of this disclosure. It is a figure which showed the flowchart of the electric power adjustment processing which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the time variation of the electric energy difference in a reference example. It is a figure which shows the example of the time variation of the electric energy difference which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the relationship between the electric energy and the response time of the apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the relationship between the absorbable amount and the responsive time which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the threshold value setting according to the operating state of the power plant which concerns on one Embodiment of this disclosure.

The power adjustment system and power plant, the power adjustment method, and one embodiment of the power adjustment program according to the present disclosure will be described below with reference to the drawings. This embodiment does not limit the disclosure. In the present embodiment, the case where the power adjustment system is applied to the power plant 1 having the coal-fired boiler 10 will be described as an example, but it may be applied to a power plant having another configuration.

FIG. 1 is a schematic configuration diagram showing a coal-fired boiler 10 of the present embodiment.

The coal-fired boiler 10 of the present embodiment uses pulverized coal obtained by crushing coal (carbon-containing solid fuel) as pulverized fuel, burns the pulverized fuel with a combustion burner, and uses the heat generated by this combustion as water supply or steam. It is a coal-fired (fine-powdered coal-fired) boiler 10 capable of generating superheated steam by exchanging heat. In the following description, the upper and upper directions indicate the upper side in the vertical direction, and the lower and lower directions indicate the lower side in the vertical direction, and the vertical direction is not strict and includes an error.

In the present embodiment, as shown in FIG. 1, the coal-fired boiler 10 has a furnace 11, a combustion device 12, and a combustion gas passage 13. The furnace 11 has a hollow shape of a square cylinder and is installed along the vertical direction. The furnace wall 101 constituting the furnace 11 is composed of a plurality of heat transfer tubes and fins connecting them, and exchanges heat generated by combustion of pulverized fuel with water or steam flowing inside the heat transfer tubes and also in the furnace. The temperature rise of the wall 101 is suppressed.

The combustion device 12 is provided on the lower side of the furnace wall 101 constituting the furnace 11. In the present embodiment, the combustion device 12 has a plurality of combustion burners (for example, 21, 22, 23, 24, 25) mounted on the furnace wall 101. For example, the

combustion burners

21, 22, 23, 24, 25 are arranged in a plurality of stages along the vertical direction as one set arranged at equal intervals along the circumferential direction of the furnace 11. However, the shape of the furnace 11, the number of combustion burners in one stage, the number of stages, the arrangement, and the like are not limited to this embodiment.

Each

combustion burner

21, 22, 23, 24, 25 is connected to a plurality of crushers (mills) 31, 32, 33, 34, 35 via pulverized

coal supply pipes

26, 27, 28, 29, 30. There is. Although the

crushers

31, 32, 33, 34, and 35 are not shown, for example, a rotary table is driven and rotatably supported in the housing of the crusher, and a plurality of rollers are placed above the rotary table to rotate the rotary table. It is configured to be supported so that it can rotate in conjunction with it. When coal is thrown between a plurality of rollers and a rotary table, it is crushed to a predetermined size of pulverized coal, and is crushed by a transport gas (primary air, oxidizing gas) in a crusher housing (not shown). The pulverized fuel conveyed to the classifier and classified within a predetermined particle size range can be supplied from the pulverized

coal supply pipes

26, 27, 28, 29, 30 to the

combustion burners

21, 22, 23, 24, 25. ..

The furnace 11 is provided with a wind box 36 at the mounting position of each

combustion burner

21, 22, 23, 24, 25, and one end of an air duct (air duct) 37 is connected to the wind box 36. The air duct 37 is provided with a forced draft fan (FDF) 38 at the other end.

As shown in FIG. 1, the combustion gas passage 13 is connected to the upper part of the furnace 11 in the vertical direction. The combustion gas passage 13 is provided with

superheaters

102, 103, 104,

reheaters

105, 106, and coal saver 107 as heat exchangers for recovering the heat of the combustion gas, and is burned in the combustion furnace 11. Heat exchange is performed between the combustion gas generated in the above and the water supply and steam flowing through each heat exchanger.

As shown in FIG. 1, the combustion gas passage 13 is connected to the flue 14 on which the heat-exchanged combustion gas is discharged on the downstream side thereof. An air heater (air preheater) 42 is provided between the flue 14 and the air duct 37 to exchange heat between the air flowing through the air duct 37 and the combustion gas flowing through the flue 14, and the

combustion burner

21 , 22, 23, 24, 25 can be heated in temperature for combustion air.

The flue 14 is provided with a denitration device 43 at a position upstream of the air heater 42. The denitration device 43 supplies a reducing agent having an action of reducing nitrogen oxides such as ammonia and urea water into the flue 14, and reacts the combustion gas to which the reducing agent is supplied with the nitrogen oxides and the reducing agent. , Nitrogen oxides in the combustion gas are removed and reduced by promoting by the catalytic action of the denitration catalyst installed in the denitration device 43. The gas duct 41 connected to the flue 14 is provided with a dust collector 44 such as an electric dust collector, an induction ventilator (IDF: Induced Draft Fan) 45, a desulfurization device 46, and the like at a position downstream of the air heater 42. A chimney 50 is provided at the downstream end.

On the other hand, when a plurality of

crushers

31, 32, 33, 34, 35 are driven, the generated pulverized fuel is pulverized

coal supply pipes

26, 27, 28, 29, 30 together with the transport gas (primary air, oxidizing gas). It is supplied to the

combustion burners

21, 22, 23, 24, 25 through. By exchanging heat with the exhaust gas discharged from the flue 14 of the coal-fired boiler 10 by the air heater 42, the heated combustion air (secondary air, oxidizing gas) is sent from the air duct 37 through the air box 36 through the air box 36. It is supplied to each

combustion burner

21, 22, 23, 24, 25. Then, the

combustion burners

21, 22, 23, 24, 25 blow the pulverized fuel mixture, which is a mixture of the pulverized fuel and the transport gas, into the furnace 11 and the combustion air into the furnace 11, and at this time, the pulverized fuel is mixed. A flame can be formed by igniting the qi. A flame is generated in the lower part of the furnace 11, and the high-temperature combustion gas rises in the furnace 11 and is discharged to the combustion gas passage 13. Air is used as the oxidizing gas in this embodiment. It may have a higher oxygen ratio than air or a lower oxygen ratio than air, and can be used by optimizing the fuel flow rate.

The furnace 11 is provided with an additional air port 39 above the mounting positions of the

combustion burners

21, 22, 23, 24, and 25. The end of the additional air duct 40 branched from the air duct 37 is connected to the additional air port 39. Therefore, the combustion air (secondary air, oxidizing gas) sent by the push-in ventilator 38 is supplied from the air duct 37 to the air box 36, and the

combustion burners

21, 22, 23, 24, are supplied from the air box 36. In addition to being able to be supplied to 25, additional combustion air (additional air) sent by the push-in ventilator 38 can be supplied from the additional air duct 40 to the additional air port 39.

In the furnace 11, in the lower region A, the pulverized fuel mixture and the combustion air (secondary air, oxidizing gas) burn to generate a flame. Here, the inside of the furnace 11 is maintained in a reducing atmosphere by setting the amount of air supplied to be less than the theoretical amount of air with respect to the amount of pulverized coal supplied. That is, the nitrogen oxides (NOx) generated by the combustion of the pulverized coal are reduced in the region B of the furnace 11, and then the additional air is additionally supplied from the additional air port 39 to complete the oxidative combustion of the pulverized coal. The amount of NOx generated by burning pulverized coal is reduced.

After that, as shown in FIG. 1, the combustion gas is a second superheater 103, a third superheater 104, a first superheater 102, which are arranged in the combustion gas passage 13 (hereinafter, may be simply referred to as a superheater). ), The second reheater 106, the first reheater 105 (hereinafter, may be simply referred to as a reheater), and the economizer 107, after heat exchange, the nitrogen oxide is reduced and removed by the denitration device 43. After the particulate matter is removed by the dust collector 44 and the sulfur oxide is removed by the desulfurization device 46, the gas is discharged from the chimney 50 into the atmosphere. Each heat exchanger does not necessarily have to be arranged in the order described above with respect to the combustion gas flow.

Next, as the heat exchanger, the

superheaters

102, 103, 104, the

reheaters

105, 106, and the economizer 107 provided in the combustion gas passage 13 will be described in detail. FIG. 2 is a schematic view showing a heat exchanger provided in the coal-fired boiler 10. FIG. 1 does not accurately show the positions of the heat exchangers (

superheaters

102, 103, 104,

reheaters

105, 106, economizer 107) in the combustion gas passage 13, and does not accurately show the positions of the heat exchangers. The arrangement order of the above with respect to the combustion gas flow is not limited to the description in FIG.

FIG. 2 shows the heat exchanger of the coal-fired boiler 10 provided in the power plant 1 of the present embodiment, the steam turbine 110 rotationally driven by the steam generated by the coal-fired boiler 10, and the steam turbine 110. It is provided with a generator 115 that is connected and generates electricity according to the rotation of the steam turbine 110.

The steam turbine 110 operated by the steam generated by the coal-fired boiler 10 is composed of, for example, a high-pressure turbine 111, a medium-pressure turbine 112, and a low-pressure turbine 113, and the steam from the reheater described later is the medium-pressure turbine 112. After flowing into the low pressure turbine 113, it flows into the low pressure turbine 113. A condenser 114 is connected to the low-pressure turbine 113, and the steam obtained by rotationally driving the low-pressure turbine 113 is cooled by the condenser 114 with cooling water (for example, seawater) to be condensed water. The condenser 114 is connected to the economizer 107 via the water supply line L1. The water supply line L1 is provided with, for example, a condensate pump (CP) 121, a low-pressure water supply heater 122, a boiler water supply pump (BFP) 123, and a high-pressure water supply heater 124. A part of the steam driving the steam turbines (111, 112, 113) is extracted into the low-pressure water supply heater 122 and the high-pressure water supply heater 124, and the high-pressure water supply heater 124 and the low-pressure water supply heater 122 pass through an bleeding line (not shown). The water supplied as a heat source and supplied to the economizer 107 is heated.

For example, the case where the coal-fired boiler 10 is a once-through boiler will be described. The economizer 107 is connected to each evaporation pipe of the furnace wall 101. When the water supplied by the economizer 107 passes through the evaporation pipe of the furnace wall 101, it receives radiation from the flame in the furnace 11 and is heated, and is guided to the brackish water separator 126 and the brackish water separator drain tank 127. Be radiated. The steam separated by the brackish water separator 126 is supplied to the

superheaters

102, 103, 104, and the drain water separated by the brackish water separator 126 is sent to the condenser 114 via the drain water line L2. Be guided.

When the once-through boiler is started or when the load is low, the entire amount of water supplied from the economizer 107 does not evaporate when passing through each evaporation pipe of the furnace wall 101, and as a result, the steam separator 126 It may be in an operating state (wet operating state) in which a water level exists. In this wet operation state, the drain water separated by the brackish water separator 126 is merged in the middle of the water supply line L1 by the circulation line L6 using the boiler circulation pump (BCP) 128 to save the economizer 107. May be circulated and supplied to each evaporation pipe of the furnace wall 101.

When the combustion gas flows through the combustion gas passage 13, the combustion gas is recovered by the

superheaters

102, 103, 104, the

reheaters

105, 106, and the economizer 107. On the other hand, the water supplied from the boiler water supply pump (BFP) 123 is preheated by the economizer 107 and then heated as it passes through each evaporation pipe of the furnace wall 101 to become steam, which is guided to the brackish water separator 126. Be taken. The steam separated by the brackish water separator 126 is introduced into the

superheaters

102, 103, 104 and superheated by the combustion gas. The superheated steam generated by the

superheaters

102, 103, 104 is supplied to the high-pressure turbine 111 via the steam line L3, and the high-pressure turbine 111 is rotationally driven. The steam discharged from the high-pressure turbine 111 is introduced into the

reheaters

105 and 106 via the steam line L4 and reheated. The reheated steam is supplied to the low-pressure turbine 113 via the medium-pressure turbine 112 via the steam line L5, and rotationally drives the medium-pressure turbine 112 and the low-pressure turbine 113. The rotating shafts of the steam turbines (111, 112, 113) rotationally drive the generator 115 to generate electricity. The steam discharged from the low-pressure turbine 113 is cooled by the condenser 114 to be condensed, and is sent to the economizer 107 again via the water supply line L1.

In the combustion gas passage 13, a suit blower (not shown) is provided in the gap between the heat transfer tubes of each heat exchanger such as the

superheaters

102, 103, 104, the

reheaters

105, 106, and the economizer 107, or in the gap of each heat exchanger. An economizer) may be arranged. The suit blower extends in a direction substantially perpendicular to the wall surface of the combustion gas passage 13. The suit blower is an injection device capable of injecting steam (gas) in a direction orthogonal to the axial direction with the direction perpendicular to the wall surface of the combustion gas passage 13 as the axial direction, and the injection direction can also be changed. The steam injected from the suit blower toward the heat exchangers such as the

superheaters

102, 103, 104, the

reheaters

105, 106, and the economizer 107 scavenges the combustion ash deposited on the surface of each heat transfer tube of the heat exchanger. It is removed to suppress a decrease in heat exchange efficiency in each heat transfer tube of the heat exchanger.

FIG. 3 shows a conceptual diagram of the power system 2 to which the power plant 1 is connected. As shown in FIG. 3, the power plant 1 is connected to the power system 2. The electric power system 2 is connected to a regenerative energy power generation facility 3 and each power plant (not shown) in addition to the power plant 1, and supplies electric power to a factory, a household, or the like, which is an electric power consumer 4. The power system 2 is also connected to a regenerative energy power generation facility 3 such as wind power generation and solar power generation, and power generated by the regenerative energy power generation facility 3 is also supplied. Since the output of power generated by wind power generation, solar power generation, etc. fluctuates depending on the state of natural energy such as wind power, wind direction, amount of solar radiation, and solar radiation time, the amount of power supply (supply) and power consumption in the power system 2 It may cause fluctuations in the balance of (demand). When the supply and demand of electric power fluctuates in the electric power system 2, the balance of supply and demand, which is the relationship between the supply and demand of electric power, becomes unbalanced, which causes the frequency fluctuation of the electric power system 2. That is, when the power supply amount becomes excessive due to the supply-demand balance of the power system 2, the frequency of the power system 2 rises, and conversely, when the power consumption increases due to the supply-supply balance of the power system 2 and the power amount becomes insufficient, the power system 2 The frequency drops. If the frequency (system frequency) in the power system 2 fluctuates, the quality of the power supplied to the power consumer 4 deteriorates. Therefore, it is preferable that the frequency fluctuation in the power system 2 is suppressed. Therefore, in the power plant 1, not only the amount of electric power supplied by power generation is adjusted, but also the amount of electric power supplied to the electric power system 2 is adjusted by using the electric power in the power plant 1 (consuming the electric power). Then, the fluctuation of the power supply and demand is flexibly dealt with and the fluctuation is suppressed so that the occurrence of the supply and demand balance in the power system 2 can be suppressed.

FIG. 4 is a configuration example of the power plant 1 in which the configuration of FIG. 2 is simplified. In FIG. 4, the same reference numerals are given to the same configurations as those in FIGS. 1 and 2. That is, fuel is charged through the valve 201, and steam is generated in the boiler 10. The flow rate of the steam generated by the boiler 10 is adjusted by the GV valve (governor valve) 202 to the steam turbine 110. Then, the steam supplied to the high-pressure turbine 111 via the GV valve 202 and discharged from the high-pressure turbine 111 is reheated by the

reheaters

105 and 106 of the boiler 10 and supplied to the medium-pressure turbine 112. Then, the steam discharged from the medium pressure turbine 112 is supplied to the low pressure turbine 113. That is, in the high-pressure turbine 111, the medium-pressure turbine 112, and the low-pressure turbine 113, steam performs the work of rotationally driving each turbine rotor, and rotationally drives the generator 115 to generate electricity. The steam that has finished its work in the low-pressure turbine 113 is condensed and restored by the condenser 114, and is supplied to the low-pressure water heater 122 by the condenser pump 121. In the low pressure water supply heater 122, a part of the steam of the low pressure turbine 113 is extracted and the water supply is used for heating. The water supply is pressurized by the boiler water supply pump 123 and supplied to the high pressure water supply heater 124. In the high-pressure water supply heater 124, a part of the steam of the medium-pressure turbine 112 and the high-pressure turbine 111 is extracted and the water supply is used for heating. The heated water supply is supplied to the boiler 10.

The power plant 1 as shown in FIG. 4 is provided with a control device 60, which will be described later.

In order to suppress power fluctuations (system frequency fluctuations) in the power system 2, the control device (power adjustment system) 60 adjusts the amount of power supplied by power generation in the power generation plant 1 and adjusts the power consumption by using power, and power is supplied. The amount of power supplied to the system 2 is adjusted.

FIG. 5 is a diagram showing an example of the hardware configuration of the control device 60 according to the present embodiment.
As shown in FIG. 5, the control device 60 is a computer system (computer system), for example, a CPU 1100, a ROM (Read Only Memory) 1200 for storing a program or the like executed by the CPU 1100, and when each program is executed. It is provided with a RAM (Random Access Memory) 1300 that functions as a work area of the above, a hard disk drive (HDD) 1400 as a large-capacity storage device, and a communication unit 1500 for connecting to a network or the like. Each of these parts is connected via a bus 1800. As the large-capacity storage device, a semiconductor memory such as a solid state drive (SDD) may be used instead of the hard disk drive (HDD) 1400.

The control device 60 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 1100 is not limited to the ROM 1200. The storage medium may be, for example, 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 1400 or the like in the form of a program, and the CPU 1100 reads this program into the RAM 1300 or the like to execute information processing / arithmetic processing. As a result, various functions described later are realized. The program may be installed in ROM 1200 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. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.

FIG. 6 is a functional block diagram showing the functions included in the control device 60. As shown in FIG. 6, the control device 60 includes an output adjusting unit 61 and a consumption control unit 65. In the present embodiment, the output adjusting unit 61 and the consumption control unit 65 are provided, but it is also possible to provide either the output adjusting unit 61 or the consumption control unit 65.

FIG. 7 is a diagram in which the required electric energy (demand) for the power plant 1 is divided according to the fluctuation cycle. As shown in FIG. 7, it is necessary to generate the required electric energy, which is the electric power required from the electric power system 2, in the power plant 1 to supply electric power. The required electric energy is divided into a long-period electric power component, a short-period electric power component, and a minute electric power fluctuation component according to the fluctuation cycle. In the control device 60, output control is performed for each component that fluctuates as shown in FIG.

The output adjusting unit 61 adjusts the power supply amount (power generation amount) in the power generation plant 1. Specifically, as shown in FIG. 6, the output adjusting unit 61 is, for example, an operation reference output control unit (hereinafter referred to as “DPC unit”) 62 and an automatic frequency control unit (hereinafter referred to as “AFC unit”). It has 63 and a governor-free section (hereinafter referred to as “GF section”) 64.

The DPC unit (operation reference output control unit) 62 mainly adjusts the output of the power supply corresponding to the long-period power component by the operation reference output control (DPC; Dispatching Power Control) (DPC control). The long-period power component is a power fluctuation with a period larger than that of the short-period power component. For example, the period of the long-period power component is about several minutes or more and less than 10 minutes. The DPC unit 62 follows the output command value (power generation load curve, load increase / decrease signal) of the power supply sent from the power company (middle supply command center) based on the power demand forecast in a long cycle such as one day. , The amount of heat input to the boiler 10 (fuel supply amount) is controlled to control the power supply amount (power generation amount). That is, the DPC unit 62 controls the power supply amount according to a power supply amount (power generation amount) schedule set in advance based on the power demand forecast.

By performing DPC control in the DPC unit 62 in this way, the output control of the power supply corresponding to the long-period power component in FIG. 7 is performed.

The AFC unit (automatic frequency control unit) 63 mainly adjusts the output of the power supply corresponding to the short-period power component by automatic frequency control (AFC; Automatic Frequency Control) (AFC control). The short-period power component is a power fluctuation having a period smaller than the output fluctuation of the power supply due to the long-period power component and larger than the output fluctuation of the power supply due to the minute power fluctuation component. That is, the AFC unit 63 adjusts the output of the power supply in response to the power fluctuation having a period larger than the output fluctuation of the power supply by the GF unit 64, which will be described later. For example, the period of the short-period power component is several tens of seconds or more and less than several minutes. The AFC unit 63 controls the amount of heat input to the boiler 10 (fuel supply amount) according to the control signal (load increase / decrease signal) transmitted from the electric power company (middle supply command) based on the frequency fluctuation in the power system 2, and is used in the power generation plant. Control the power supply amount (power generation amount) of 1. That is, the AFC unit 63 controls the output of the power supply according to the generated system frequency fluctuation (detected system frequency fluctuation (power fluctuation)).

By performing AFC control in the AFC unit 63 in this way, the output control of the power supply corresponding to the short-period power component in FIG. 7 is performed.

The GF unit (governor-free unit) 64 mainly adjusts the output of the power supply for the power minute fluctuation component (GF control). The power minute fluctuation component is a power fluctuation having a period smaller than the output fluctuation of the power supply by automatic frequency control (AFC). For example, the period of the power minute fluctuation component is less than several tens of seconds. The GF unit 64 controls the output of the electric power supply by adjusting the opening degree of the GV valve 202 at the inlet of the steam turbine 110. As for the control of the GV valve 202, for example, drop control (droop control) is performed as shown in FIG. In drop control, as shown in FIG. 8, the vertical axis is the opening degree of the GV valve 202 and the horizontal axis is the frequency (generator rotation speed), and the opening degree of the GV valve 202 with respect to the difference from the reference frequency (for example, 60 Hz) f0. Is preset. Therefore, the opening degree of the GV valve 202 corresponding to the current frequency is determined from FIG. 8, and the opening degree of the GV valve 202 is adjusted to the opening degree to control the output of the minute fluctuation component of the power supply. Is performed, and as a result, the frequency is controlled.

By performing GF control in the GF unit 64 in this way, output control corresponding to the power minute fluctuation component in FIG. 7 is performed.

Actually, there is a slight load fluctuation that is less than the power minute fluctuation component, but the frequency is maintained by the inertia of each component of the power plant 1. That is, the frequency change is suppressed by the heat capacity of the boiler 10 and the rotational inertia of the generator 115.

The output adjusting unit 61 controls the output of the power supply amount corresponding to each component of FIG. 7. When the control corresponding to each component is expressed as the relationship between the load change width (load change amount) and the load fluctuation cycle, the regions (inertia, DPC region, AFC region, and GF region) are divided as shown in FIG. The load change width is the amount of change in the power supply required for the power plant 1 corresponding to the power fluctuation amount of the power system 2, and the load fluctuation cycle is the change amount of the power supply required for the power plant 1 corresponding to the power fluctuation amount of the power system 2. This is the required power supply change cycle. That is, as shown in FIG. 9, the amount of steam supplied to the steam turbine 110 is controlled for fluctuations in a region where the load change width is small and the load fluctuation cycle is small (corresponding to the power minute fluctuation component in FIG. 7). The load is controlled by the GF unit (governor-free unit) using the GV unit (governor valve unit) 64 (GF region). Since the control of the GV valve 202 has an upper limit on the load change width and the load fluctuation cycle, the fluctuation in the load change width and the load fluctuation cycle region larger than the upper limit (corresponding to the power short cycle component in FIG. 7) The output is controlled by the AFC unit (automatic frequency control unit) 63 (AFC region). Since there is also an upper limit to the control of the amount of heat input to the boiler 10, the DPC unit is used for fluctuations in the load change width and load fluctuation cycle region (corresponding to the power long cycle component in FIG. 7) larger than the upper limit. The power supply amount is controlled by 62 (DPC area).

Although the output is controlled corresponding to each region as shown in FIG. 9, further fluctuations occur in the power system 2 due to fluctuations in the power supply amount of the regenerative energy power generation facility 3 connected to the power system 2. It can occur. In such a case, an imbalance occurs in the relationship between the amount of power demand and the amount of power supplied, a difference between the amount of power demand and the amount of power supplied (power supply / demand gap) occurs, and frequency fluctuation occurs in the power system 2. There is a possibility that it will end up. Therefore, especially when the amount of power supplied to the power system 2 exceeds the amount of required power, the consumption control unit 65, which will be described later, further controls the output. That is, when the power supplied in the power system 2 becomes larger than the power consumed, the power system 2 is stabilized by consuming the power in the power plant 1.

The consumption control unit 65 controls the power consumption (absorption control) so that the power is consumed in the power plant 1, reduces the imbalance between the demand and the supply of power, and suppresses the frequency fluctuation in the power system 2. Let me. Specifically, as shown in FIG. 6, the consumption control unit 65 includes a determination unit 66 and a supply control unit 67. The electric power consumed in the power generation plant 1 may be the electric power generated in the power generation plant 1 or the electric power supplied from the electric power system 2.

The determination unit 66 determines whether or not the load change width (load change width corresponding to the load fluctuation cycle) of the power plant 1 corresponding to the power fluctuation amount of the power system 2 is equal to or greater than a preset threshold value. The threshold value indicates the boundary at which the absorption control of the power consumption is started, and is set for the load change width and the load change cycle. Specifically, in the present embodiment, the power fluctuation amount that cannot be handled by the AFC is absorbed by the absorption control. Therefore, the threshold value is the upper limit value (load change width corresponding to the load fluctuation cycle) of the adjustment region (AFC region) in which the power supply amount can be controlled by controlling the amount of heat input to the boiler 10. The threshold is set as a solid line at the upper limit of the AFC region, for example, as shown in FIG. In the present embodiment, the case where the threshold value is set in the AFC region will be described, but the threshold value is set corresponding to the GF region and the DPC region to positively supply power to the equipment in the power generation plant 1. May be good.

That is, the determination unit 66 determines whether or not the load change width is equal to or greater than the threshold value in the AFC region. The lower limit boundary of the AFC region is the upper limit of the load change width and the load change cycle in which the output can be adjusted by the cooperation of the boiler 10 and the GV valve 202. In other words, the boundary between the AFC region and the GF region is set based on the follow-up performance of the boiler 10 that generates the steam supplied to the turbine. Then, in the AFC region, the upper limit boundary (AFC region and DPC) is the upper limit of the load change width and the load fluctuation cycle in which the output of the power supply amount can be adjusted by controlling the amount of heat input to the boiler 10 in response to the generated system frequency fluctuation. Boundary with the area). In the present embodiment, the upper limit is set as the threshold value corresponding to the AFC region, but the upper limit of the AFC region and the DPC region (the upper limit of the load change width with respect to the corresponding load fluctuation cycle) may be set as the threshold value.

As in the example of FIG. 10, by setting the threshold value at which the absorption control is performed, the region where the load change width is equal to or larger than the threshold value (absorption control region of FIG. 10) corresponds to the absorption control of the power consumption amount. Become. In FIG. 10, the absorption control region is shown extending in the direction in which the load change width and the load fluctuation cycle become higher, but the electric power is absorbed in the range of the load change width and the load fluctuation cycle that can be handled by the absorption control region. The range of the absorption control region in FIG. 10 depends on the auxiliary equipment (consumed), and is an example. Therefore, as shown in FIG. 10, it is possible to expand the region capable of responding to power fluctuations by performing absorption control together with the region (AFC region) that can be adjusted by AFC control. Therefore, it is possible to flexibly respond to the generated load fluctuation cycle in a wider range and suppress the fluctuation more effectively.

The determination result by the determination unit 66 is output to the supply control unit 67, which will be described later.

The supply control unit 67 performs absorption control of the electric energy when the load change width corresponding to the load fluctuation cycle is equal to or larger than the threshold value. That is, the supply control unit 67 supplies at least one of the electric power generated by the power generation plant 1 and the electric power from the electric power system 2 to the equipment capable of consuming the electric power in the power generation plant 1. Specifically, it is preferable that the supply control unit 67 supplies electric power to an auxiliary machine that is provided in the power plant 1 as an apparatus and performs an intermittent operation. More preferably, it is preferable that the electric power supplied to the auxiliary machine can be temporarily stored as some kind of energy. Auxiliary equipment that performs intermittent operation is equipment that is used only for a certain period of time (equipment that is not used regularly). The device that supplies electric power by the supply control unit 67 is not particularly limited as long as it is a device that can consume electric power. In the present embodiment, the electric pump (M-BFP) and the heat pump 203 will be described as an example of the electric power supply destination device that performs the intermittent operation. As an auxiliary machine capable of temporarily storing energy, a compressor (compressor) 71 and a water supply pump 92 will be described as an example.

First, a case where the compressor 71 is used as an auxiliary machine will be described. That is, the power consumption by the absorption control is generated by the compressor 71. The compressor 71 is connected to the receiver tank 72. The power plant 1 is provided with a large number of valves 73 that operate using compressed air. As shown in FIG. 11, for example, these valves 73 are opened / closed and controlled (opening adjustment) by the air pressure stored in the receiver tank 72. The receiver tank 72 is connected to the compressor 71 to store compressed air. That is, when the pressure in the receiver tank 72 becomes less than the predetermined lower limit value, the compressor 71 is driven, and the compressed air is replenished to the predetermined upper limit value and stored in the receiver tank 72. Therefore, the compressor 71 is an auxiliary machine that can perform intermittent operation and temporarily store it as air pressure energy.

By supplying power to the compressor 71 according to a command corresponding to the absorption control that consumes power from the supply control unit 67, by consuming a part of the power generated by the power plant 1, and / or by power. By consuming the electric power supplied from the system 2, the electric power fluctuation of the electric power system 2 can be absorbed by the power plant 1 and consumed by the compressor 71. That is, the electric power can be stored in the receiver tank 72 as air pressure, and the electric power due to the electric power fluctuation can be effectively utilized. The stored pressure of the receiver tank 72 is used during the opening / closing operation and the control operation of the valve 73.

Next, a case where an electric pump (M-BFP) is used as an auxiliary machine will be described. That is, the power consumption by the absorption control is generated by the electrically driven boiler water supply pump (M-BFP). In the boiler water supply pump 123 shown in FIG. 4, for example, as shown in FIG. 12, a steam-driven boiler water supply pump (T-BFP) and an M-BFP may be connected in parallel. The M-BFP is a pump that supplies water to the boiler 10. For example, the boiler water supply pump is configured as shown in FIG. In the T-BFP, the steam inside the power plant 1 (for example, the exhaust of the medium pressure turbine) is supplied to the steam turbine 81 via the regulating valve 82, the energy of the steam is converted into rotational force, and the T-BFP is driven. .. In the M-BFP, the motor 85 is driven by electric power, and the M-BFP is driven. The amount of water supplied to the M-BFP side can be adjusted by the valve 84. In this way, the M-BFP becomes an electric pump.

In the boiler water supply pump 123, for example, in a steady state, water is supplied to the boiler 10 by the T-BFP, and the M-BFP is also driven when the power plant 1 starts up or when the power generation load changes, so that the amount of water supplied to the boiler 10 is predetermined. Some are adjusted to be values. That is, when the power plant 1 is started up or when the power generation load changes, the T-BFP and the M-BFP are driven in parallel, so that the amount of water supplied to the boiler 10 is stabilized.

The supply control unit 67 supplies power to the M-BFP and consumes the power, so that the power fluctuation of the power system 2 is absorbed by the power plant 1 and consumed by the M-BFP (absorption control). Specifically, by starting the M-BFP and supplying water to the boiler 10, it is possible for the M-BFP to absorb power fluctuations. When the M-BFP is driven with the electric power corresponding to the electric power fluctuation, the water supply amount by the M-BFP may fluctuate. However, by adjusting the flow rate with the valve 84 provided for the M-BFP, it is possible to suppress fluctuations in the water supply flow rate in the M-BFP, for example, as shown in FIG. Further, the fluctuation of the water supply flow rate in the M-BFP may be adjusted by setting the motor 85 of the M-BFP to be controllable by the inverter and controlling the motor 85 in combination with the flow rate adjustment of the valve 84.

T-BFP and M-BFP may be operated in parallel. In this case, for example, as shown in FIG. 14, the M-BFP is driven while absorbing the power fluctuation, and the T-BFP is also driven by steam. By doing so, the amount of steam used to drive the T-BFP can be reduced, and the amount of steam (regulatory valve) that supplies the fluctuation of the water supply flow rate due to the fluctuation of the electric power of the M-BFP to the T-BFP. It is possible to suppress fluctuations in the flow rate of water supplied to the boiler 10 by absorbing it by controlling the flow rate adjustment by 82). As shown in FIG. 14, it is possible to stably supply water by reducing the error ΔF between the water supply flow rate supplied to the boiler 10 and the target flow rate. That is, the M-BFP can absorb the power fluctuation of the power system 2 while suppressing the fluctuation of the water supply flow rate to the boiler 10.

Next, a case where the heat pump 203 is used as an auxiliary machine will be described. That is, the power consumption by the absorption control is generated by the heat pump 203. The heat pump 203 is a heater that heats water. The heat pump 203 is a device that supplies hot water to a demand destination. For example, the heat pump 203 may heat the boiler feed water. The heat pump 203 is provided, for example, on the upstream side of the boiler 10 and on the downstream side of the high-pressure water supply heater 124, or in parallel, as shown in FIG.

By driving the heat pump 203 by the supply control unit 67 to consume electric power, the electric power fluctuation of the electric power system 2 can be consumed in the power generation plant 1 (absorption control). As the heat pump 203, for example, an electric heater using an electric resistor may be used. By using the heat pump 203, it is possible to perform heating more efficiently than, for example, an electric heater.

Next, a case where the water supply pump 92 is used as an auxiliary machine will be described. That is, the power consumption by the absorption control is generated by the water supply pump 92 for producing pure water. The water supply pump 92 is a pump that sends water to the tank. For example, in the power plant 1, as shown in FIG. 16, water that has been treated such as removing impurities to supply pure water (for example, factory water, city water, etc.) to pure water (for supply to the boiler 10 as make-up water), etc. ) Is generated. Specifically, as shown in FIG. 16, the raw water stored in the raw water tank 91 is sent to the ion exchange unit 93 by the water supply pump 92 and stored as pure water in the pure water tank 94. The water supply pump 92 is operated when pure water is generated and stored.

By driving the water supply pump 92 by the supply control unit 67 to consume electric power, the electric power fluctuation of the electric power system 2 can be absorbed in the power generation plant 1. That is, by operating the water supply pump 92 when the power consumption is required, the water supply pump 92 can be used as an auxiliary machine capable of temporarily storing the power fluctuation portion of the power system 2 as energy for pure water production.

In the present embodiment, the compressor 71, the electric pump (M-BFP), the heat pump 203, and the water supply pump 92 have been illustrated as devices that consume electric power, but the absorption control that consumes electric power from the supply control unit 67 has been described. The device is not limited to the above as long as it is a device capable of consuming electric power according to the corresponding command, and the supply control unit 67 can consume electric power due to the electric power fluctuation of the electric power system 2.

Next, an example of the power adjustment process by the control device 60 described above will be described with reference to FIG.
FIG. 17 is a flowchart showing an example of the procedure of the power adjustment process according to the present embodiment. The flow shown in FIG. 17 is repeatedly executed at a predetermined control cycle, for example, when the power plant 1 is in operation.

First, based on the control signal (load increase / decrease signal) transmitted from the electric power company (middle supply command), it is determined whether or not the load change width corresponding to the load fluctuation cycle is equal to or greater than the threshold value (S101).

When the load change width is not equal to or greater than the threshold value (NO determination in S101), the AFC control is executed to effectively execute the power supply amount output control corresponding to the fluctuation to suppress the frequency fluctuation of the power system 2 (NO determination in the power system 2). S102).

When the load change width is equal to or greater than the threshold value (YES determination in S101), the power is absorbed by a device that can consume power in addition to the AFC control, and the frequency fluctuation of the power system 2 is suppressed (S103).

Next, the effect of the above-mentioned power adjustment process will be described with reference to FIGS. 18 and 19.
FIG. 18 shows a case where the power adjustment process is not performed as a reference example. FIG. 19 shows a case where the power adjustment process is performed as in the present embodiment. The figure shown in FIG. 19 is a diagram showing an image of the effect and is an example.

In FIG. 18 (upper side of the paper), in the reference example, the amount of power supplied from the power plant 1 to the power system 2 (transmission amount = power supply amount by power generation of the power plant 1-power consumption amount consumed in the power plant 1). The value obtained by subtracting the power consumption (demand) in the power system 2 from the power system 2 is used as the power amount difference, and the fluctuation with time is shown. If the power adjustment process is not performed, a large difference in electric energy will occur. Therefore, as shown on the lower side of the paper in FIG. 18, frequency fluctuation occurs in the power system 2 due to the difference in electric energy. That is, when the difference in electric energy is positive (the amount of power transmitted is larger than the demand), the frequency in the electric power system 2 increases. When the difference in electric energy is negative (the electric energy is smaller than the demand), the frequency in the electric power system 2 decreases. As described above, when the power adjustment process is not performed, it is difficult to keep the difference in electric energy low, so that it is difficult to suppress the frequency fluctuation generated in the power system 2.

On the other hand, in FIG. 19 (upper side of the paper), the amount of power supplied from the power plant 1 to the power system 2 (transmission amount = power supply amount by power generation of the power plant 1-power consumption in the power plant 1). -Fluctuation with respect to time as the difference in electric energy, which is the value obtained by subtracting the electric energy (demand) required for the power plant 1 from the electric energy system 2 from the electric energy consumed by supplying the electric power system 2 to the power plant 1. Is shown. In FIG. 19, for example, the power fluctuation of the electric energy difference A1 shown in the upper view of the paper can be suppressed by GF control or AFC control. On the other hand, in GF control and AFC control, there is an upper limit to the difference in electric energy that can be suppressed, but by also performing absorption control that consumes electric power in the equipment in the power plant 1, for example, the electric energy fluctuation in the electric energy difference A2 is also suppressed. It becomes possible to do. Therefore, as shown on the lower side of the paper in FIG. 19, for example, the frequency fluctuation in the power system 2 hardly occurs in the direction in which the frequency increases, and the fluctuation in the direction in which the frequency decreases also becomes small. Therefore, the occurrence of frequency fluctuation is reduced.

In the example of FIG. 19, the frequency fluctuates in the direction of decreasing frequency, but a storage battery or the like is provided in the power plant 1 to control the discharge to compensate for the insufficient power supply amount in the power plant 1. By discharging, it becomes possible to further suppress the frequency fluctuation in the direction in which the frequency decreases.

Next, the amount of absorption when absorption control is performed will be described.

For devices that can consume power, there is a response time for each device. Response time is the time it takes for a device to start up and consume power. Depending on the equipment that can be used for power consumption in the power plant 1, the relationship between the amount of power consumed and the response time is shown, for example, as shown in FIG. The characteristics of FIG. 20 are an example, and such characteristics vary depending on the equipment available for power consumption. The characteristics as shown in FIG. 20 may be estimated from the operation results of each device in the power plant 1 (for example, the record of fluctuations in the amount of power consumed in the power plant 1), or the specifications of each device may be used. It may be set as follows.

In FIG. 20, the electric energy in the operating state of the equipment at a certain time in the power plant 1 is shown by a solid line as L1, and the electric power when the equipment that can be stopped is stopped is shown by a single point chain line as L2, and the consumption of each equipment is shown. The installed capacity (total electric energy) including the total electric energy is shown by a broken line as L3. That is, ΔW1 = (L3-L1), which is the amount of electric power that can be absorbed by consuming electric power by starting each device with respect to the operating state at a certain time point C1. When stopping the device that can be stopped, ΔW2, which is the amount of power that can be transmitted, becomes ΔW2 = (L1-L2). As an example of equipment that can be started or stopped, for example, as in the compressor 71, if the pressure in the receiver tank 72 does not affect the continuation of operation of the power plant 1, it can be temporarily started or stopped. Is. That is, by temporarily starting the startable device, it is possible to carry out absorption control by power consumption when the amount of power supplied from the power generation plant 1 to the power system 2 becomes excessive. By temporarily stopping the equipment that can be stopped, the amount of power that can be supplied from the power plant 1 to the power system 2 temporarily increases. Therefore, as in the case of installing the storage battery or the like described above, the power system 2 It is possible to help suppress the frequency decrease of.

The amount of power that can be absorbed by starting the equipment and the amount of power that can be transmitted by stopping the equipment changes depending on the operating state of each equipment in the power plant 1. For example, assuming the operating state C1 and the operating state C2 in FIG. 20, when the device that can be started from the operating state C1 is started, the amount of electric power that can be absorbed is ΔW1, and the device that can be started from the operating state C2 is displayed. When started, the amount of power that can be absorbed is ΔW3. On the other hand, when the stoptable device is stopped, the amount of electric power that can be transmitted is ΔW2 and ΔW4, respectively, in the operating states C1 and C2.

The relationship between the absorbable amount (ΔW1 and ΔW3) and the responsive time is as shown in FIG. FIG. 21 shows a case where stopped devices are started in sequence (one by one or a plurality of devices at the same time). That is, the amount that can be absorbed in the operating state C1 is larger than that in the operating state C2. Therefore, based on the operating status of each device in the power plant 1, for example, as shown in FIG. 22, the operating state C1 having a larger absorbable amount than the operating state C2 in the region above the threshold value has a wider range. Can be covered. By controlling the absorption of power consumption in a region exceeding the AFC region, it becomes possible to absorb power fluctuations more effectively.

Next, the threshold setting will be described.

In this embodiment, absorption control is performed for power fluctuations equal to or larger than the load change width (load change width corresponding to the load fluctuation cycle) that can be handled by AFC. Therefore, the threshold value is set as the upper limit of the load change width that can be handled by AFC. In other words, the threshold value is set as the upper limit of the load change width that can be dealt with by the amount of heat input (fuel supply amount) to the boiler 10 for the short-period electric power component. The threshold values are set, for example, as a load change width of ± 5%, a load change speed of 1% / min, and the like.

The threshold value may be appropriately set as the upper limit of the load change range that can be handled by AFC according to the operating conditions and weather conditions of the power plant 1. Specifically, it may be set according to the degree of change of the AFC directive, the change of the weather condition, and the like. In this case, the threshold value may be set based on a preset control rule (rule base), or the threshold value may be set using a trained model by AI or the like.

By setting the threshold value to an appropriate value, the power fluctuation amount in the power system 2 is more effectively absorbed by the power generation plant 1 by the absorption control, and the output of the power supply amount corresponding to the fluctuation effectively. It is possible to execute control and suppress frequency fluctuations in the power system 2.

As described above, according to the power adjustment system and the power plant 1 according to the present embodiment, the power adjustment method, and the power adjustment program, the load change required for the power plant 1 due to the fluctuation of the supply and demand power of the power system 2. When the amount (load change width) is less than the threshold value, the electric power in the power plant 1 is supplied to the equipment that can consume the electric power, so that the electric power fluctuation amount can be consumed by the electric power. Therefore, it is possible to suppress power fluctuations in the power system 2.

When the power generation plant 1 is provided with a function for suppressing power fluctuations (for example, AFC), the power generation plant 1 can control the release of the power supply amount and absorb the power consumption amount by using the function in combination with the function. By using control, it is possible to expand the range of power fluctuations that can be handled.

It is set for the load fluctuation amount and the load fluctuation cycle, and the load fluctuation amount and the threshold value are compared for the AFC region. Therefore, in the AFC region, which is an adjustment region in which the amount of power supplied to the boiler 10 can be controlled by controlling the amount of heat input, if a load fluctuation exceeding that is required, absorption control that consumes power in the device is performed. It can be used to suppress power fluctuations. Therefore, a margin can be provided in the AFC region, and the AFC region can be expanded.

Since power can be supplied to the equipment that is performing intermittent operation, the power fluctuation of the power system 2 can be consumed and absorbed in the power plant 1, and further stored as another form of energy. There are also devices that can do this. For example, by driving the compressor 71 connected to the receiver tank 72, it becomes possible to absorb and store the power fluctuation of the power system 2 as air pressure in the power generation plant 1. Further, since electric power can be consumed by driving an electrically driven water supply pump (M-BFP) that supplies electric power to the boiler 10, electric power fluctuations in the electric power system 2 can be absorbed in the power plant 1. .. By operating the M-BFP, it is possible to supply water to the boiler 10 while reducing the amount of steam used in the steam-driven water supply pump (T-BFP), and effective surplus power that is desirable to be consumed due to power fluctuations. It is possible to maintain a stable water supply flow rate to the boiler 10 by utilizing it. Since electric power can be supplied to the heat pump 203 that heats water, it is possible to consume and absorb electric power fluctuations in the electric power system 2 in the power plant 1. By operating the heat pump 203, water can be heated, and surplus electric power, which is desirable to be consumed due to electric power fluctuation, can be effectively utilized. Since the electric power can be supplied to the water pump 92 that sends water to the tank, the electric power fluctuation of the electric power system 2 can be consumed and absorbed in the power plant 1. It is possible to effectively utilize surplus power, which is desirable to be consumed due to power fluctuations. By operating the water supply pump 92, it is possible to generate pure water and transport / store pure water, and it is possible to effectively utilize surplus electric power that is desirable to be consumed due to electric power fluctuation.

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.

The electric power adjustment system and power plant (1) described in each of the above-described embodiments, the electric power adjustment method, and the electric power adjustment program are grasped as follows, for example.
The power adjustment system (60) according to the present disclosure determines whether or not the load change amount required for the power plant (1) due to the fluctuation of the supply and demand power amount of the power system (2) is equal to or more than a preset threshold value. When the load change amount is equal to or greater than the threshold value, the power generated by the power plant (1) and the power system (2) are generated by the determination unit (66) and the equipment capable of consuming the power in the power plant (1). ) Is provided with a supply control unit (67) that supplies at least one of the electric powers from the).

According to the power adjustment system (60) according to the present disclosure, the load change amount (load change width) corresponding to the change amount of the power supply amount of the power plant (1) due to the power fluctuation of the power system (2) is set in advance. If it is above the threshold, the power is supplied to the equipment that can consume the power in the power plant (1), so that the equipment can effectively utilize and consume a part of the surplus power that is desirable to be consumed due to power fluctuations. can. Therefore, it is possible to suppress the power fluctuation in the power system (2), and it is possible to suppress the frequency fluctuation in the power system (2).

If the power plant (1) is provided with a function for suppressing power fluctuations (for example, AFC), the fluctuation range of the power supply amount that can be handled by the power plant (1) by using the function in combination with the function can be determined. It is also possible to expand, and it is possible to effectively control the amount of change in the amount of power supply in response to fluctuations.

In the power adjustment system (60) according to the present disclosure, the threshold value is set to the adjustment area in which the power supply amount of the power plant (1) can be controlled by controlling the amount of heat input to the boiler (10). It may be set as an upper limit value of the load change amount corresponding to the load fluctuation cycle in.

According to the power adjustment system (60) according to the present disclosure, the threshold value is the upper limit value of the load change amount corresponding to the load fluctuation cycle in the adjustment region where the power supply amount can be controlled by controlling the amount of heat input to the boiler (10). Therefore, even if the amount of heat input to the boiler is not sufficient, absorption control can be performed to suppress power fluctuations.

In the power adjustment system (60) according to the present disclosure, the supply control unit (67) may supply power to an auxiliary machine that performs intermittent operation provided in the power plant (1) as the equipment.

According to the power adjustment system (60) according to the present disclosure, it is possible to effectively use a part of the surplus power that is desirable to be consumed by supplying power to the device that is operating intermittently. Therefore, the power system (2) It becomes possible to absorb the power fluctuation of the above in the power generation plant (1). By driving the intermittent operation device, it is possible to temporarily store electric power as another energy.

In the power adjustment system (60) according to the present disclosure, the device may be a compressor (71) connected to a receiver tank (72).

According to the power adjustment system (60) according to the present disclosure, power can be supplied to the compressor (71) connected to the receiver tank (72), so that the power fluctuation of the power system (2) can be caused by the power generation plant (2). In 1), it becomes possible to consume and absorb electric power. By operating the compressor (71), electric power can be stored in the receiver tank (72) as air pressure energy, and it is possible to effectively utilize a part of the surplus electric power that is desirable to be consumed due to electric power fluctuation. It becomes.

In the power adjustment system (60) according to the present disclosure, the device may be an electric drive pump (M-BFP) that supplies water to the boiler (10).

According to the power adjustment system (60) according to the present disclosure, power can be supplied to the electric drive pump (M-BFP) that supplies water to the boiler (10), so that the power fluctuation of the power system (2) can be affected. It becomes possible to consume and absorb electric power in the power plant (1). By operating the electric drive pump (M-BFP), water can be supplied to the boiler (10), and it becomes possible to effectively utilize a part of the surplus electric power that is desirable to be consumed due to electric power fluctuation. ..

In the power adjustment system (60) according to the present disclosure, the device may be a heat pump (203) that heats at least a part of the water circulating in the power plant (1).

According to the electric power adjustment system (60) according to the present disclosure, since electric power can be supplied to the heat pump (203) for heating water, the electric power fluctuation of the electric power system (2) is consumed in the power plant (1). Can be absorbed. By operating the heat pump (203), it is possible to heat water such as water supplied to the boiler (10), and it is possible to effectively utilize a part of the surplus electric power that is desirable to be consumed due to electric power fluctuation. It becomes.

In the power adjustment system (60) according to the present disclosure, the device may be a pump (92) that sends water to the tank (94).

According to the power adjustment system (60) according to the present disclosure, power can be supplied to the pump (92) that sends water to the tank (94), so that the power fluctuation of the power system (2) is caused by the power plant (1). It is possible to consume and absorb electric power in the system. It is possible to effectively utilize the electric power due to the electric power fluctuation. By operating the pump (92), water can be transported, and it becomes possible to effectively utilize a part of the surplus electric power that is desirable to be consumed due to electric power fluctuation.

In the power adjustment system (60) according to the present disclosure, the threshold value may be set based on at least one of the operating condition and the weather condition of the power plant (1).

According to the power adjustment system (60) according to the present disclosure, it is possible to appropriately set the threshold value according to the situation by using at least one of the operating condition and the weather condition of the power plant (1). Become.

The power plant (1) according to the present disclosure includes a boiler (10), steam turbines (111, 112, 113), and the above-mentioned power adjustment system (60).

The power adjustment method according to the present disclosure includes a step of determining whether or not the load change amount required for the power plant (1) due to the fluctuation of the supply and demand power amount of the power system (2) is equal to or more than a preset threshold value. When the load change amount is equal to or greater than the threshold value, at least one of the electric power generated by the power plant (1) and the electric power from the electric power system (2) to the device capable of consuming the electric power in the power plant (1). It has a step of supplying one of them.

The power adjustment program according to the present disclosure includes a process of determining whether or not the load change amount required for the power plant (1) due to the fluctuation of the supply and demand power amount of the power system (2) is equal to or more than a preset threshold value. When the load change amount is equal to or greater than the threshold value, at least one of the electric power generated by the power plant (1) and the electric power from the electric power system (2) to the device capable of consuming the electric power in the power plant (1). Have the computer execute the process of supplying one of them.

1: Power plant 2: Power system 3: Regenerated energy power generation equipment 4: Power consumer 10: Boiler 11: Fire furnace 12: Combustion device 13: Combustion gas passage 14: Chimney 21: Combustion burner 22: Combustion burner 23: Combustion burner 24: Combustion burner 25: Combustion burner 26: Pulverized coal supply pipe 27: Pulverized coal supply pipe 28: Pulverized charcoal supply pipe 29: Pulverized charcoal supply pipe 30: Pulverized charcoal supply pipe 31: Crusher 32: Crusher 33: Crusher 34: Crusher 35: Crusher 36: Air box 37: Air duct 38: Push-in ventilator 39: Additional air port 40: Additional air duct 41: Gas duct 42: Air heater 43: Denitration device 44: Dust collector 46: Sulfurization device 50: Chimney 60: Control device 61: Output adjustment unit 62: DPC unit (operation standard output control unit)
63: AFC unit (automatic frequency control unit)
64: GF part (governor-free part)
65: Consumption control unit 66: Judgment unit 67: Supply control unit 71: Compressor 72: Receiver tank 73: Valve 81: Steam turbine 82: Adjustment valve 84: Valve 85: Motor 91: Raw water tank 92: Condenser pump 93: Ion Replacement unit 94: Pure water tank 101: Fire furnace wall 102: First superheater 103: Second superheater 104: Third superheater 105: First reheater 106: Second reheater 107: Coal saver 110: Steam turbine 111: High pressure turbine 112: Medium pressure turbine 113: Low pressure turbine 114: Condenser 115: Generator 121: Condensation pump 122: Low pressure water supply heater 123: Boiler water supply pump 124: High pressure water supply heater 126: Steam water separator 127 : Steam water separator drain tank 201: Valve 202: GV valve (turbine valve)
203: Heat pump 1100: CPU
1200: ROM
1300: RAM
1400: Hard disk drive 1500: Communication unit 1800: Bus L1: Water supply line L2: Drain water line L3: Steam line L4: Steam line L5: Steam line L6: Circulation line

Claims

A determination unit that determines whether or not the amount of load change required for the power plant due to fluctuations in the amount of supply and demand power of the power system is equal to or greater than a preset threshold value.
When the load change amount is equal to or greater than the threshold value, a supply control unit that supplies at least one of the electric power generated by the power plant and the electric power from the electric power system to a device capable of consuming electric power in the power plant. Power regulation system equipped with.
The threshold value is set as an upper limit value of a load change amount corresponding to a load fluctuation cycle in the adjustment area, with a region in which the power supply amount of the power plant can be controlled by controlling the amount of heat input to the boiler as an adjustment region. The power adjustment system according to claim 1.
The power adjustment system according to claim 1 or 2, wherein the supply control unit supplies power to an auxiliary machine that performs intermittent operation provided as the equipment in the power plant.
The power adjustment system according to claim 3, wherein the device is a compressor connected to a receiver tank.
The power adjustment system according to claim 3 or 4, wherein the device is an electrically driven pump that supplies water to the boiler.
The power adjustment system according to any one of claims 3 to 5, wherein the device is a heat pump that heats at least a part of water circulating in the power plant.
The power adjustment system according to any one of claims 3 to 6, wherein the device is a pump that sends water to a tank.
The power adjustment system according to any one of claims 1 to 7, wherein the threshold value is set based on at least one of the operating condition and the weather condition of the power plant.
With a boiler
With a steam turbine
The power adjustment system according to any one of claims 1 to 8.
Power plant equipped with.
The process of determining whether or not the load change amount required for the power plant due to the fluctuation of the supply and demand power amount of the power system is equal to or more than the preset threshold value, and
It has a step of supplying at least one of the electric power generated by the power plant and the electric power from the electric power system to a device capable of consuming the electric power in the power plant when the load change amount is equal to or more than the threshold value. Power adjustment method.
Processing to determine whether the load change amount required for the power plant due to fluctuations in the supply and demand power amount of the power system is equal to or greater than a preset threshold value, and
When the load change amount is equal to or greater than the threshold value, a computer performs a process of supplying at least one of the electric power generated by the power plant and the electric power from the electric power system to a device capable of consuming electric power in the power plant. Power adjustment program to be executed by.