Cooperative control system and method for nuclear power generation and pumped storage power generation

Abstract

To provide a cooperative control system for nuclear power generation and pumped storage power generation capable of highly efficiently and stably supplying power.SOLUTION: A cooperative control system for nuclear power generation and pumped storage power generation in a power system where a nuclear power plant and a pumped storage power plant are connected, includes; an integrated control device that inputs a power generation output command from a central power supply, issues a power generation command to the nuclear power plant, and issues a charging command to the pumped storage power plant; a nuclear power control device that controls a power generation output of the nuclear power plant in response to the power generation command from the integrated control device; and a pumped storage power generation control device that controls the power generation output and pumping power of the pumped storage power plant in response to the power generation command and the charging command from the integrated control device. When the power generation output command from the central power supply instructs increase in output, the integrated control device issues the power generation command for generating power from the pumped storage power plant to the pumped storage power plant. When the power generation output command from the central power supply instructs reduction in output, the integrated control device outputs the charging command for charging the pumped storage power plant using power of the nuclear power plant to the pumped storage power plant. When a charge amount of the pumped storage power plant reaches chargeable capacity, the integrated control device outputs to the nuclear power plant a nuclear power generation command correction value for operating the nuclear power plant with decreased output.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a coordinated control system and method for nuclear power generation and pumped-storage power generation.

Background Art

[0002] Pumped-storage power generation, which pumps water from a lower reservoir (lower pond) to an upper reservoir (upper pond) using surplus power and generates electricity by dropping water from the upper pond to the lower pond when power demand increases, is utilized as a large-capacity power storage means for leveling power demand and supply.

[0003] It is known that pumped-storage power generation pumps water using power at night or during the daytime on holidays and generates electricity during the daytime or at night when power demand increases due to the activation of social activities. Pumped-storage power generation, which can store large amounts of power, is utilized as reserve power when power demand increases or as a power source for restoring power generation facilities in the event of a large-scale power outage. Also, since it is possible to switch between pumping and power generation in a short period of time, it is also used as an adjustment force to match power supply and demand.

[0004] Regarding such pumped-storage power generation, Patent Document 1 proposes "a nuclear power plant having a nuclear reactor is provided near a pumped-storage power plant having a reservoir pumped by a pumping pump, and the generators of both plants are connected to a power transmission cable via an in-plant power transmission system, and at least one pumping pump of the pumped-storage power plant connected to the generator of the nuclear power plant via this in-plant power transmission system is driven by the surplus power of the nuclear power plant, and at least one reservoir of the pumped-storage power plant is configured as the water source of the nuclear power plant. A combined power plant characterized by this."

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Patent Document 1 discloses a combined power generation system in which pumped-storage power generation is built within the same site as nuclear power generation, and the surplus power of nuclear power generation is used as the power for pumping. In response to the increase in power demand during the day, nuclear power generation, hydroelectric power generation, and pumped-storage power generation are each operated to increase their output so that the power demand and supply match.

[0007] However, Patent Document 1 does not consider the influence of solar power generation, which is also expected to increase during the day. Solar power generation is being introduced together with wind power generation as a means of obtaining power without emitting carbon dioxide, which is one of the causative substances of global warming. It is known that the power generation output of solar power generation increases during the day when the sun altitude is high, but the power generation output also varies depending on the weather and climate. Therefore, it acts as a disturbance that disrupts the balance between power demand and supply in the power grid. Conventionally, the balance between power demand and supply has been maintained by the output fluctuation of thermal power generation. However, since thermal power generation is a major source of carbon dioxide emissions, it is expected to be phased out sequentially, and there is concern about a shortage of adjustment power in the future.

[0008] On the other hand, there is a problem in securing the power used for pumping in pumped-storage power generation. When using the power of pumped-storage power generation for the increased power demand at night, it is necessary to hold a sufficient amount of water in the upper pond (that is, sufficient power is stored). However, when using the power from solar power generation for pumping, the pumping volume (power storage volume) changes depending on the weather, so there may be a case where the amount of power that can be supplied at night is insufficient.

[0009] The present invention has been made based on the above-described matters, and an object thereof is to provide a coordinated control system and method for nuclear power generation and pumped-storage power generation that can supply power efficiently and stably.

Means for Solving the Problems

[0010] Accordingly, in the present invention, there is provided a coordinated control system for nuclear power and pumped-storage power generation in a power system in which a nuclear power plant and a pumped-storage power plant are connected, comprising: a central control device that inputs a power generation output command from the central power supply, gives a power generation command to the nuclear power plant, and gives a power generation command and a charging command to the pumped-storage power plant; a nuclear power control device that controls the power generation output of the nuclear power plant according to the power generation command from the central control device; and a pumped-storage power generation control device that controls the power generation output and the pumping power of the pumped-storage power plant according to the power generation command and the charging command from the central control device. The central control device gives a power generation command for generating power from the pumped-storage power plant to the pumped-storage power plant when the power generation output command from the central power supply is an increase in output, and outputs a charging command for charging the pumped-storage power plant using the power of the nuclear power plant to the pumped-storage power plant when the power generation output command from the central power supply is a decrease in output. When the charged amount of the pumped-storage power plant reaches the chargeable capacity, the central control device outputs a nuclear power generation command correction value for reducing the output of the nuclear power plant and operating it. A coordinated control system for nuclear power and pumped-storage power generation, characterized in that.

[0011] In the present invention, there is also provided a coordinated control method for nuclear power and pumped-storage power generation in a power system in which a nuclear power plant and a pumped-storage power plant are connected. A computer that executes coordinated control of nuclear power and pumped-storage power generation inputs a power generation output command from the central power supply, gives a power generation command to the nuclear power plant, and gives a power generation command and a charging command to the pumped-storage power plant. When the power generation output command from the central power supply is an increase in output, the computer gives a power generation command for generating power from the pumped-storage power plant to the pumped-storage power plant. When the power generation output command from the central power supply is a decrease in output, the computer outputs a charging command for charging the pumped-storage power plant using the power of the nuclear power plant to the pumped-storage power plant. When the charged amount of the pumped-storage power plant reaches the chargeable capacity, the computer outputs a power generation command for reducing the output of the nuclear power plant and operating it. A coordinated control method for nuclear power and pumped-storage power generation, characterized in that.

Advantages of the Invention

[0012] According to the present invention, a coordinated control system for nuclear power and pumped-storage power generation capable of supplying power with high efficiency and stability can be obtained.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Examples

[0015] FIG. 1 shows a schematic configuration example of a coordinated control system for nuclear power generation and pumped-storage power generation according to an embodiment of the present invention.

[0016] FIG. 1 shows a configuration example of a power system and a configuration example of its control system. First, according to the configuration example of the power system, the power system 1 includes a solar power generation plant 4 (renewable energy power generation plant), a nuclear power generation plant 2, and a pumped-storage power generation plant 9. Although not shown, in addition to other power generation facilities such as thermal power plants that use fossil fuels, factories, facilities, houses, etc. that consume power are also connected to the power system 1.

[0017] In this power system, the nuclear power generation plant 2 and the pumped-storage power generation plant 9 are managed by a first power generation operator, the solar power generation plant 4 (renewable energy power generation plant) is managed by a plurality of second power generation operators, and the transmission and transformation equipment and transmission lines of the power system are managed by a power transmission operator.

[0018] As described above, the power system includes thermal power plants that use fossil fuels. However, since the present invention aims at high-efficiency operation in clean power plants, Figure 1 depicts a solar power plant 4, a nuclear power plant 2, and a pumped-storage power plant 9, which are clean power plants.

[0019] In an embodiment of the present invention, the operation modes for achieving high-efficiency operation in a clean power plant are described. There is an operation mode in which the first power generation operator executes the operation only with the power generation facilities (nuclear power plant 2 and pumped-storage power plant 9) under its management. When the first power generation operator alone has insufficient power, there is an operation mode in which the second power generation operator participates. By appropriately selecting these operation modes, clean and high-efficiency operation is realized.

[0020] In Figure 1, as a control system, a nuclear control device 5 for controlling the nuclear power plant 2, a pumped-storage power generation control device 6 for controlling the pumped-storage power plant 9, and a general control device 7 for coordinately controlling these control devices 5 and 6 constitute a coordinated control system for nuclear power generation and pumped-storage power generation.

[0021] Among these, the nuclear power plant 2 in Figure 1 represents a boiling water reactor light water reactor as an example. A boiling water reactor light water reactor is a pressure vessel that loads a fuel body (fuel rods) inside and fills the cooling water to a certain water level. Control rods for controlling the nuclear fission of the fuel body are loaded in the nuclear reactor, and the speed of nuclear fission is determined by the position of the control rods. By pulling out the control rods, the nuclear fission reaction proceeds, and the cooling water in the nuclear reactor boils due to the generated heat, and steam is obtained. Also, in a boiling water reactor light water reactor, the thermal output of the nuclear reactor can be controlled even in a method where a part of the nuclear reactor cooling water is drawn out from the nuclear reactor and recirculated to the lower part of the nuclear reactor. Furthermore, in a boiling water reactor light water reactor, the steam obtained in the nuclear reactor is supplied to a turbine generator, and power is obtained by the driving force of the turbine. The power can be adjusted by opening and closing the turbine governor. The obtained power is transmitted to the power system 1 as nuclear power generation output 8 via a transmission line.

[0022] Therefore, the nuclear power control device 5 obtains the power generation command 19 from the overall control device 7, and in order to satisfy this command, it gives the control rod position command 12 that determines the position of the control rod and the recirculation pump command 13 that determines the recirculation amount of the recirculation pump to the reactor side, and gives the turbine governor control command 14 to the turbine side.

[0023] On the other hand, the pumped-storage power plant 3 has two operating modes. One is the pumping and charging operation of pumping the water in the lower pond to the upper pond using the pumping pump, and the other is the pumped-storage power generation operation of dropping the water in the upper pond to the lower pond to generate electricity.

[0024] Therefore, the pumped-storage power generation control device 6 overall controls the pumping and charging operation and the pumped-storage power generation operation. For example, during the pumping and charging operation, based on the pumping and charging command 21 from the overall control device 7, it creates the control command 16 for the pumping pump to drive the pumping pump and pump the water in the lower pond to the upper pond. The power for driving the pumping pump is received from the power grid 1 as the pumping pump power 10. During the pumped-storage power generation operation, it controls the generated power by adjusting the opening degree 16 of the water outlet of the upper pond based on the pumped-storage power generation command 20. The obtained power is transmitted to the power grid 1 as the pumped-storage power generation output 9.

[0025] In addition, the pumped-storage power generation control device 6 takes in the information of the upper pond water level 17 and the lower pond water level 18 of the pumped-storage power plant 3 in order to overall control the pumping and charging operation and the pumped-storage power generation operation, obtains the dischargeable capacity 22 from the water level 17 of the upper pond for pumped-storage power generation, and obtains the chargeable capacity 23 from the water level of the lower pond.

[0026] Specifically, the upper pond lower limit water level is set for the upper pond water level 17, and the dischargeable capacity 22 of the upper pond is obtained from the upper pond water level 17, the upper pond lower limit water level, and the cross-sectional structure of the upper pond in between. Similarly, the lower pond lower limit water level is set for the lower pond water level 18, and the chargeable capacity 23 of the lower pond is obtained from the lower pond water level 18, the lower pond lower limit water level, and the cross-sectional structure of the lower pond in between.

[0027] Although not shown in FIG. 1, the central power supply command center (central supply) sends a power generation output command 24 to the power generation facilities connected to the power system 1 so that the power supply amount from the power generation facilities connected to the power system 1 always matches the power demand of factories, facilities, houses, etc.

[0028] In the coordinated control system for nuclear power generation and pumped-storage power generation according to the present invention, there is a general control device 7 that inputs the power generation output command 24 and outputs control commands (in the nuclear power plant 2, it is the power generation command 19, and in the pumped-storage power plant 3, the power generation command and the charging command correspond to this) for controlling the nuclear power plant 2 and the pumped-storage power plant 3 respectively.

[0029] The general control device 7 inputs the aforementioned power generation output command 24, the renewable energy purchase price 25 in the power market, and the weather information 26, and also inputs the dischargeable capacity 22 obtained from the water level of the upper pond of the pumped-storage power plant 3 and the chargeable capacity 23 obtained from the water level of the lower pond. Then, it outputs a power generation command (nuclear power generation command correction value) 19 to the nuclear power generation control device 5, and outputs a pumped-storage power generation command 20 and a pumped-storage charging command 21 to the pumped-storage power generation control device 6. Furthermore, it transmits a power trading command 27 to the power trading market so as to introduce the power for pumping from the power system 1.

[0030] The nuclear power plant 2 is controlled by the nuclear power generation control device 5. Specifically, based on the power generation command (nuclear power generation command correction value) 19 described above, the thermal output of the nuclear reactor is controlled by the control rod position command 14 and the recirculation pump command 13. Also, the power generation amount of the turbine generator is controlled by the turbine governor opening 12.

[0031] In the present invention, based on the renewable energy purchase price 25 and the weather information 26 in the power market (for example, the supply-demand adjustment market), the power supply source of the pumping power 10 is selected from the nuclear power generation output 8, the solar power generation output 11, and the power of other power generation facilities (not shown), and the power procurement destination is transmitted to the power trading market as the power trading command 27.

[0032] The configuration of the overall control device 7 in the present invention will be described with reference to FIG. 2. The overall control device 7 not only cooperatively controls the nuclear power plant 2 and the pumped-storage power plant 3 based on the power generation output command 24 from the medium feed, but also determines the switching of the charge-discharge operation of the pumped-storage power plant 3 and the procurement destination of the pumped water pump power based on auxiliary information such as the renewable energy purchase price 25 and the weather information 26. The procedure for the determination will be described below.

[0033] First, the first discharge amount prediction means 28 predicts various information necessary when supplying the power insufficient in the morning when the output of the solar power generation is insufficient and the power demand increases from the pumped-storage power plant 4. The information includes the power generation start time, the power generation duration, the power generation amount at each power generation time, and the total power generation amount (electric energy). In this embodiment, these are collectively referred to as the morning electric energy 35.

[0034] The reason for this is that the amount of electric energy that becomes insufficient when balancing demand and supply varies depending on the weather. For example, in bad weather, the amount of power generation from solar power generation cannot be obtained, so the amount of electric energy is large, and in fine weather, the amount of electric energy tends to be small. In the present invention, on the night before power generation, the weather and sunshine amount of the next day are obtained as weather information, and the amount of insufficient electric energy is predicted from the annual performance up to the previous year.

[0035] The second discharge amount prediction means 29 predicts various information necessary when supplying the power insufficient during night-time social activities from the pumped-storage power plant 3. Similar to the above-mentioned morning electric energy 35, the information includes the power generation start time, the power generation duration, the power generation amount at each power generation time, and the total power generation amount (electric energy). These are collectively referred to as the night-time electric energy 36.

[0036] The reason for this is that the amount of insufficient electric energy varies depending on the climate and season. For example, in summer when the load of the cooling device increases or in winter when the load of the heating device increases, the amount of electric energy is large, and in spring and autumn, the amount of electric energy tends to be small. In the present invention, during the daytime of the power generation day, the night-time temperature and climate are obtained as weather information, and the amount of insufficient electric energy is predicted from the annual performance up to the previous year.

[0037] Note that the weather and sunshine amount for the next day used by the first discharge prediction means 28 and the temperature and climate for the current day used by the second discharge amount prediction means 29 are collectively referred to as meteorological information 26 here.

[0038] The power procurement destination selection means 30 inputs the previously estimated morning power amount 35, night power amount 36, and renewable energy purchase price 25, and selects the cheapest power for charging in the morning and at night. Note that since the power from late at night on the previous day is used for charging in the morning, the procurement destination automatically selects power generation facilities other than solar power generation (renewable energy) connected to the power grid. Since the power during the day on the current day is used for charging at night, the procurement destination selects the cheapest power price from any of solar power generation connected to the power grid, nuclear power generation which is the object of coordinated control in the present invention, and other power generation facilities. Also, the selection result is output as power procurement information 37.

[0039] Based on the morning power amount 35 predicted by the first discharge amount prediction means 28 or the night power amount 36 predicted by the second discharge amount prediction means 29 and the chargeable capacity 23 from the pumped-storage power plant 3, the pumped-storage charging plan setting means 33 determines the pumped-storage charging plan. As described above, when the morning power amount 35 is input, the charging plan until late at night on the day before power generation (specifically, from 0:00 to 5:00) is determined, that is, the charging start time, charging duration, charge amount at each charging time, and total charge amount.

[0040] Also, when the night power amount 36 is input, the pumped-storage charging plan setting means 33 determines the charging plan until the day on which power is generated (specifically, from 9:00 to 16:00 when the output of the solar power plant 4 increases), that is, the charging start time, charging duration, charge amount at each charging time, and total charge amount. Furthermore, the charging plans for night or day are integrated and transmitted to the pumped-storage power generation control device as the pumped-storage charging command 21 at each time. At the same time, in the power trading command transmission means 32, the pumped-storage charging command 38 which is the output from the pumped-storage plan setting means 33 and the power procurement information 37 which is the output from the power procurement destination selection means 30 are integrated and transmitted to the procurement destination as the power trading command 27. The power trading command 27 includes information on the power reception time, power reception amount, and power reception period.

[0041] In the power generation command correction means 31, the power generation output command 24 from the medium feed is input, and a nuclear power generation command correction value is output as the power generation command 19. When the power procurement information 37 selects the nuclear power plant 2 as the procurement destination, the amount specified by the pumping charge command 21 among the rated output of the nuclear power plant 2 is transmitted from the grid as the pumping power of the pumping power generation plant 3. The rated output of the nuclear power plant 2 is used for the nuclear power generation command correction value 19.

[0042] When the power generation output command is lower than the rated output of the nuclear power plant 2, that is, when the output of the solar power generation plant 4 is excessive, the nuclear power plant 2 reduces the target value of the power generation output within an acceptable range so that the nuclear power generation output 8 follows the power generation output command 24. That is, in the nuclear power generation control device 5, the turbine governor opening 12 is gradually closed to reduce the power generation output, and at the same time, the recirculation pump command 13 and the control rod position command 14 are adjusted to reduce the amount of steam generated from the nuclear reactor. The target value of the power generation output is transmitted to the nuclear power generation control device as the nuclear power generation command correction value 19.

[0043] If the nuclear power generation control device cannot receive the power generation output command correction value via a network or the like, the person in charge of controlling the nuclear power plant 2 may manually increase or decrease the target value of the power generation output based on the nuclear power generation command correction value 19.

[0044] When the power generation output command 24 exceeds the rated output of the nuclear power plant 2, that is, when the output of the solar power generation plant 4 is insufficient during the day or there is a power shortage at night, the difference between the power generation output command 24 and the rated output of the nuclear power plant 2 is increased and output to the pumped-storage power generation plan setting means 34 as the DR (Demand Response) command 38, while the rated output of the nuclear power plant 2 is transmitted to the nuclear power generation control device as the nuclear power generation command correction value 19.

[0045] In the pumping power generation plan setting means 34, based on the morning power generation amount 35 predicted by the first discharge amount prediction means 28, the night power generation amount 36 predicted by the second discharge amount prediction means 29, the power generation capacity 22 from pumping power generation, and further the upward DR command 38, a power generation plan for pumping is determined. As described above, when the morning power generation amount 35 is input, a power generation plan until morning (specifically, from 6:00 to 10:00 in the morning) is determined, that is, the power generation start time, the power generation duration, the power generation amount at each power generation time, and the total power generation amount (power generation amount).

[0046] Also, when the night power generation amount 36 is input, a power generation plan until night on the power generation day (specifically, from 17:00 to 21:00 when the power demand increases) is determined. Further, the power generation plans for morning or night are integrated and transmitted to the pumping power generation control device as the pumping power generation command 20 at each time.

[0047] As described above, in the coordinated control system of the nuclear power plant 2 and the pumping power generation plant 3 in the present invention, by coordinately controlling the nuclear power plant 2 and the pumping power generation plant 3 based on the power generation output command, in addition to the output reduction operation, it is also possible to flexibly change the power generation output in response to the upward DR that was difficult in the conventional nuclear power plant 2. In particular, it can respond to the power shortage in the morning due to the output fluctuation of the solar power generation plant 4 and the increase in power demand at night, and contribute to maintaining the balance between power demand and supply throughout the day by allocating part of the nuclear power to the power used for pumping in the pumping power generation plant 3.

[0048] An example of the coordinated control of nuclear power generation and pumping power generation by the overall control device 7 of the present invention will be described with reference to FIGS. 3 and 4.

[0049] FIG. 3 shows an example of the daily load characteristics of power demand in the power grid and the power generation characteristics of the power generation facilities that supply power. This figure shows the power demand from 0:00 to 24:00 (0:00 the next day) and the power supply amount of the main power generation facilities in a stacked graph. In addition, in this figure, the operation characteristics of the nuclear power plant 2 and the pumping power generation plant 3 when the present invention is not applied are shown for the purpose of explanation.

[0050] In the figure, the power demand 39 increases from around 6:00 am due to the start of social activities, peaks at noon, and then gradually decreases while remaining at a high level overnight.

[0051] Also, with the increase in sunlight intensity, the solar power generation 42 increases from around 7:00 am, peaks at noon, and then stops generating power at 5:00 pm.

[0052] For such power demand and solar power generation, the conventional nuclear power plant 2 maintains a constant level as shown by the nuclear power generation 40, and the pumped-storage power plant 3 generates power twice, in the morning and at night, as shown by the pumped-storage power generation 41.

[0053] In addition, the power other than that from the nuclear power plant 2, pumped-storage power plant 3, and solar power plant 4 is supplied from renewable energy power generation such as wind power generation, hydroelectric power generation, and geothermal power generation, as well as from new types of power generation such as hydrogen power generation and heat storage power generation. However, these power generation means do not have adjustment capabilities, or for efficiency maintenance, a constant operation at the highest efficiency is recommended. The conventional thermal power plants that used to function as adjustment power have reduced their power generation scale for carbon dioxide emissions reduction, and are responsible for governor-free operation and short-time output adjustment by small increases or decreases in output.

[0054] Therefore, the pumped-storage power plant 3 that can store power is utilized as adjustment power. However, as described above, since the power storage amount depends on the power generation amount of the solar power plant 4, when the power storage amount changes due to weather or climate, the power supply in the morning and at night becomes unstable, the balance between demand and supply is disrupted, and there are concerns about overburdening the thermal power plants.

[0055] Figure 4 shows an example of the power generation characteristics of nuclear power generation and pumped-storage power generation when the overall control device 7 of the present invention is applied. This figure shows the transitions of the solar power generation output 11 from 0:00 to 24:00, the power generation output command 24 from medium supply, the nuclear power generation command correction value 19, which is the output of the overall control device of the present invention, the pumped-storage power generation command 20, and the pumped-storage charging command 21.

[0056] In the figure, the photovoltaic power output 11 increases as the sunshine amount increases, reaches a peak at noon, and then stops generating electricity around 5 p.m. In contrast, for medium power supply, a power generation output command 24 is transmitted to the overall control device 7 so as to maintain the balance between power demand and supply while operating the nuclear power plant 2 at base load.

[0057] The overall control device 7 receives the power generation output command 24, and in the power generation command correction means 31, raises a power generation command exceeding the rated output of the nuclear power plant 2 and transmits it as a DR command 38 to the pumped-storage power generation plan setting means 34. Note that the morning power amount and the night power amount are estimated by the first discharge amount prediction means 29 and the second discharge amount prediction means 29.

[0058] The morning power amount is fully charged by pumping water at night. The power required for charging at night is procured by the power procurement destination selection means 30 and the power trading command transmission means 32. The night power amount is charged by pumping water during the day. In this figure, the power of part A of the power generation output command 24, that is, the part where the output is reduced in the power generation output command 24, is allocated to part A' of the pumping charge command 21, so that the system as a whole operates with a reduced output.

[0059] In the power generation output command 24, the output is temporarily reduced at noon. This is to deal with the excessive output of the photovoltaic power plant 4 by reducing the output of the nuclear power plant 2 (without suppressing the output of photovoltaic power generation). When the power amount required for daytime pumping charge is sufficiently secured and exceeds the chargeable capacity, the nuclear power plant 2 temporarily reduces its output to contribute to maintaining the balance between demand and supply.

[0060] As described above, in the coordinated control system of nuclear power generation and pumped-storage power generation in the present invention, by combining a nuclear power plant and a pumped-storage power plant, it can be utilized as an adjustment force. In particular, since both the nuclear power plant and the pumped-storage power plant use a turbine, which is a rotating body for power generation, they contribute to stabilizing the power system frequency by the inertial force of the turbine.

[0061] According to the coordinated control system for nuclear power generation and pumped-storage power generation of the present invention described above, in the overall control means, in response to the power generation output command from the medium feed, the power generation output shared by nuclear power among the power generation output command values is output to the nuclear power generation as a nuclear power generation command correction value. Also, the power generation output shared by the pumped-storage power generation is output to the pumped-storage power generation as a pumped-storage power generation command. As a result, flexible load operation, which was impossible with conventional nuclear power generation or pumped-storage power generation alone, becomes possible and can be used as an adjustment force to balance the demand and supply of electricity.

[0062] Further, according to the coordinated control system of the present invention, in the overall control means, the amount of electric power required for the discharge of the pumped-storage power generation is predicted from the weather information and output to the pumped-storage power generation as a pumped-storage charging command. As a result, it is possible to stably maintain the amount of electric power during discharge, which has changed depending on the weather in conventional pumped-storage power generation, and improve the reliability as an adjustment force.

[0063] Further, according to the coordinated control system of the present invention, in the overall control means, by inputting the renewable energy power price in the power market, it is possible to select whether to procure the electric power required for the charging of the pumped-storage power generation from the power market or from the nuclear power generation. By performing pumping with cheaper electric power, it is possible to reduce the operating cost of the entire system.

Explanation of Reference Numerals

[0064] 1: Power grid 2: Nuclear power plant 3: Pumped-storage power plant 4: Solar power plant 5: Nuclear power generation control device 6: Pumped-storage power generation control device 7: Overall control device 8: Nuclear power generation output 9: Pumped-storage power generation output 10: Pumping pump power 11: Solar power generation output 12: Turbine governor opening 13: Recirculation pump command 14: Control rod position command 15: Pumping pump command 16: Outlet opening degree 17: Upper pond water level 18: Lower pond water level 19: Nuclear power generation command correction value 20: Pumped-storage power generation command 21: Pumped-storage charging command 22: Generable capacity 23: Chargeable capacity 24: Power generation output command 25: Electricity price 26: Weather information 27: Power trading command 28: First discharge amount prediction means 29: Second discharge amount prediction means 30: Power procurement destination selection means 31: Power generation command correction means 32: Power trading command transmission means 33: Pumped-storage charging plan setting means 34: Pumped-storage power generation plan setting means 35: Morning power consumption 36: Nighttime power consumption 37: Power procurement information 38: Upward DR command 39: Power demand 40: Conventional nuclear power generation amount 41: Conventional pumped-storage power generation amount 42: Conventional solar power generation amount

Claims

1. A coordinated control system for nuclear power generation and pumped-storage power generation in a power system in which a nuclear power plant and a pumped-storage power plant are connected, comprising: a central control device that inputs a power generation output command from an intermediate supply, issues a power generation command to the nuclear power plant, and issues a power generation command and a charging command to the pumped storage power plant; a nuclear power control device that controls the power generation output of the nuclear power plant in response to the power generation command from the central control device; and a pumped storage power generation control device that controls the power generation output and pumping power of the pumped storage power plant in response to the power generation command and the charging command from the central control device. The integrated control device issues a power generation command to the pumped storage power plant to generate power from the pumped storage power plant when the power generation output command from the intermediate supply is to increase output, and outputs a charging command to the pumped storage power plant to charge the pumped storage power plant using power from the nuclear power plant when the power generation output command from the intermediate supply is to decrease output, A coordinated control system for nuclear power generation and pumped-storage power generation, characterized in that when the charge amount of a pumped-storage power plant reaches its chargeable capacity, a nuclear power generation command correction value for reducing the output of the nuclear power plant and operating the nuclear power plant is output to the nuclear power plant.

2. The cooperative control system for nuclear power generation and pumped storage power generation according to claim 1 in a power grid to which a solar power plant is further connected, The integrated control device inputs the purchase price of solar power generation in the electricity market and determines the source of electricity to be used for charging the pumped storage power generation based on the purchase price of solar power generation in the electricity market.

3. 3. A coordinated control system for nuclear power generation and pumped-storage power generation according to claim 2, The integrated control device inputs future weather information, such as the weather for the next day, the amount of sunlight for the next day, the temperature during the night on that day, and the climate (season) for that day, and determines a charging plan and a power generation plan for the electricity to be used for power generation at the pumped-storage power plant. This is a coordinated control system for nuclear power generation and pumped-storage power generation.

4. A method for cooperative control of nuclear power generation and pumped-storage power generation in a power system to which a nuclear power plant and a pumped-storage power plant are connected, comprising: A computer that executes the coordinated control of the nuclear power plant and the pumped-storage power plant receives a power generation output command from an intermediate supply, issues a power generation command to the nuclear power plant, and issues a power generation command and a charging command to the pumped-storage power plant. The computer issues a power generation command to the pumped storage power plant to generate power from the pumped storage power plant when the power generation output command from the intermediate supply is to increase output, and outputs a charging command to the pumped storage power plant to charge the pumped storage power plant using power from the nuclear power plant when the power generation output command from the intermediate supply is to decrease output, A method for cooperative control of nuclear power generation and pumped-storage power generation, characterized in that when the charge amount of the pumped-storage power plant reaches its chargeable capacity, a power generation command is output to the nuclear power plant to reduce the output of the nuclear power plant and operate it.

5. The method for cooperative control of nuclear power generation and pumped-storage power generation according to claim 4 in a power system to which a solar power plant is further connected, The method for cooperative control of nuclear power generation and pumped storage power generation, characterized in that the computer inputs the purchase price of solar power generation in the electricity market and determines the source of procurement of electricity to be used for charging the pumped storage power generation based on the purchase price of solar power generation in the electricity market.

6. A method for cooperative control of nuclear power generation and pumped-storage power generation according to claim 5, comprising: The computer inputs future weather information, such as the weather for the next day, the amount of sunlight for the next day, the temperature during the night on that day, and the climate (season) for that day, and determines a charging plan and a power generation plan for the electricity to be used for power generation at the pumped-storage power plant.

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