Hydrogen production system, control device and hydrogen production method

Abstract

To provide a hydrogen manufacturing system capable of effectively manufacturing hydrogen while controlling a CO2 discharging amount of hydrogen to be manufactured.SOLUTION: A hydrogen manufacturing system comprises a hydrogen manufacturing device for manufacturing hydrogen by consuming one power of generation power generated by a power generator and reception power received from a power system, that are obtained by using recyclable energy for each time; a first storage device for storing first hydrogen manufactured with the hydrogen manufacturing device by consuming the generation power; and a second storage device for storing second hydrogen manufactured with the hydrogen manufacturing device by consuming the reception power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a hydrogen production system, a control device, and a hydrogen production method. [Background technology]

[0002] In recent years, hydrogen has been attracting attention as an energy source for reducing carbon dioxide (CO2) emissions (hereinafter referred to as CO2).

[0003] For example, Patent Document 1 discloses a control device that controls input power to a hydrogen production device that receives power generated by a solar power generator or the like and power supplied from a power grid to produce hydrogen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 121436 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the control device described in Patent Document 1 aims to improve the reliability of power supply and demand adjustment for the hydrogen production device, and therefore has the problem of being unable to control CO2 emissions during hydrogen production.

[0006] In particular, there is a global movement to classify hydrogen according to the amount of CO2 emitted during its production in order to move towards a decarbonized society, but the control device described in Patent Document 1 has difficulty producing hydrogen in accordance with this movement.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a hydrogen production system, a control device, and a hydrogen production method that enable efficient hydrogen production while controlling CO2 emissions from the produced hydrogen. [Means for solving the problem]

[0008] A hydrogen production system according to one embodiment of the present disclosure includes a hydrogen production device that produces hydrogen by consuming either power generated by a generator that uses renewable energy or power received from a power grid, selected at each time point; a first storage device that consumes the generated power and stores the first hydrogen produced by the hydrogen production device; and a second storage device that consumes the received power and stores the second hydrogen produced by the hydrogen production device.

[0009] A control device according to another aspect of the present disclosure is a control device that controls a hydrogen production device provided in a hydrogen production system, the hydrogen production system comprising: a hydrogen production device that produces hydrogen by consuming one of power generated by a generator that uses renewable energy and power received from a power grid, selected at each time; a first storage device that consumes the generated power and stores first hydrogen produced by the hydrogen production device; and a second storage device that consumes the received power and stores second hydrogen produced by the hydrogen production device, and the control device selects at each time one of the generated power and the received power as input power to the hydrogen production device.

[0010] A hydrogen production method according to another aspect of the present disclosure includes the steps of: a hydrogen production device producing hydrogen by consuming one of electric power generated by a generator using renewable energy and electric power received from a power grid, selected at each time; storing first hydrogen produced by the hydrogen production device by consuming the generated electric power in a first storage device; and storing second hydrogen produced by the hydrogen production device by consuming the received electric power in a second storage device.

[0011] The present disclosure can also be realized as a computer program for causing a computer to function as a characteristic processing unit included in a control device, and it goes without saying that such a computer program can be distributed on a computer-readable non-transitory recording medium such as a CD-ROM (Compact Disc-Read Only Memory) or via a communication network such as the Internet. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to efficiently produce hydrogen while controlling the CO2 emissions from the produced hydrogen. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a hydrogen production system according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a block diagram illustrating a hardware configuration and a functional configuration of the control device according to the first embodiment of the present disclosure. [Figure 3] FIG. 3 is a diagram illustrating an example of a screen display by the display control unit according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is a flowchart illustrating an example of a processing procedure of the control device according to the first embodiment of the present disclosure. [Figure 5] FIG. 5 is a diagram showing the overall configuration of a hydrogen production system according to the second embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram showing the relationship between the amount of power PBat_ac(t) and the amount of power PBat_dc(t). [Figure 7] FIG. 7 is a diagram illustrating an example of a screen display by a display control unit according to the second embodiment of the present disclosure. [Figure 8] FIG. 8 is a flowchart illustrating an example of a processing procedure of the control device according to the second embodiment of the present disclosure. [Figure 9] FIG. 9 is a diagram for explaining an example of control of a hydrogen production system by a control device according to the third embodiment of the present disclosure. [Figure 10] FIG. 10 is a diagram for explaining an example of control of a hydrogen production system by a control device according to the fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Summary of the embodiments of the present disclosure] First, an outline of the embodiments of the present disclosure will be listed and described. (1) A hydrogen production system according to one embodiment of the present disclosure includes a hydrogen production device that produces hydrogen by consuming either power generated by a generator that uses renewable energy or power received from a power grid, the power being selected on an hourly basis; a first storage device that consumes the generated power and stores first hydrogen produced by the hydrogen production device; and a second storage device that consumes the received power and stores second hydrogen produced by the hydrogen production device.

[0015] According to this configuration, during the time when the generated power is selected, the first hydrogen produced using the generated power as the power consumed by the hydrogen production device is stored in the first storage device. Furthermore, during the time when the received power is selected, the second hydrogen produced using the received power as the power consumed by the hydrogen production device is stored in the second storage device. In this way, a single hydrogen production device can produce the first hydrogen and the second hydrogen in a time-division manner and store each hydrogen separately. This allows for switching control using a single hydrogen production device, such as consuming the received power to produce the second hydrogen during times when the amount of generated power is low, and consuming the generated power to produce the first hydrogen during times when the received power rate is high. This enables efficient hydrogen production. Furthermore, separate storage devices are used depending on the type of power used to produce hydrogen. Therefore, by changing the mixing ratio of the first hydrogen and the second hydrogen, the CO2 emissions from the produced hydrogen can be controlled.

[0016] (2) Preferably, the above-described hydrogen production system further includes a mixer that mixes the first hydrogen stored in the first storage device and the second hydrogen stored in the second storage device.

[0017] This configuration allows the first hydrogen and the second hydrogen to be mixed at an appropriate ratio, thereby controlling the CO2 emissions from the produced hydrogen by changing the hydrogen mixing ratio.

[0018] (3) More preferably, the hydrogen production system further includes a control device that selects, on an hourly basis, one of the generated power and the received power as input power to the hydrogen production device.

[0019] According to this configuration, the control device can cause one hydrogen production device to produce the first hydrogen and the second hydrogen in a time-division manner, thereby enabling efficient hydrogen production.

[0020] (4) The control device may also include a generated power amount acquisition unit that acquires the amount of power generated by the generator, and a determination unit that determines the amount of power received from the power grid based on the rated input power of the hydrogen production device and the generated power amount, and selects one of the generated power and the received power for each hour.

[0021] According to this configuration, one of the generated power and the received power can be consumed by the hydrogen production device every hour to produce the first hydrogen and the second hydrogen.

[0022] (5) The determination unit may also determine the amount of received power by optimizing a predetermined objective function under the constraint that the amount of power input to the hydrogen production device does not exceed the rated input power amount for each hour.

[0023] This configuration makes it possible to optimize a predetermined objective function while ensuring that the amount of power input to the hydrogen production device does not exceed the rated input power amount at each time point. For example, optimizing the objective function to maximize the amount of hydrogen production enables efficient hydrogen production.

[0024] (6) The control device may also include a power generation amount acquisition unit that acquires the power generation time and power generation amount by the generator, and a determination unit that determines the power receiving time of the received power based on the target operating rate of the hydrogen production device and the power generation time and power generation amount by the generator.

[0025] According to this configuration, the power receiving time can be determined so that the target operation rate of the hydrogen production device can be achieved, thereby enabling efficient hydrogen production.

[0026] (7) The control device may further include a display control unit that displays on a screen the amount of the first hydrogen stored in the first storage device and the amount of carbon dioxide emitted for producing the first hydrogen, and the amount of the second hydrogen stored in the second storage device and the amount of carbon dioxide emitted for producing the second hydrogen.

[0027] According to this configuration, the user can know the percentage of carbon dioxide emitted in the hydrogen production process.

[0028] (8) The display control unit may further cause the generated power and the received power input to the hydrogen production device to be displayed on the screen.

[0029] With this configuration, the user can know how much of the generated power and received power is being used for hydrogen production.

[0030] (9) The display control unit may further cause the screen to display the amount of carbon dioxide emitted in the production of each of the generated power and the received power.

[0031] According to this configuration, the amount of carbon dioxide emitted in the production of the generated power and the received power is displayed on the screen along with the values ​​of the generated power and the received power. This allows the user to know the amount of carbon dioxide emitted in the production of hydrogen. For example, by multiplying the value of the received power by the amount of carbon dioxide emitted in the production of the received power, the user can know the amount of carbon dioxide emitted in the production of the second hydrogen.

[0032] (10) The power generating system may further include a storage battery that is charged with the generated power, and the output power from the generator or the storage battery may be used as the power generated by the generator.

[0033] According to this configuration, even in a configuration including a storage battery, it is possible to efficiently produce hydrogen while controlling the amount of carbon dioxide emitted during hydrogen production.

[0034] (11) The hydrogen production system may further include a control device that controls the mixing ratio of the first hydrogen and the second hydrogen produced by the mixer based on a target value for carbon dioxide emissions during hydrogen production.

[0035] According to this configuration, the first hydrogen and the second hydrogen can be mixed according to the target value, thereby controlling the amount of carbon dioxide emitted from the produced hydrogen.

[0036] (12) A control device according to another embodiment of the present disclosure is a control device that controls a hydrogen production device provided in a hydrogen production system, the hydrogen production system comprising: a hydrogen production device that produces hydrogen by consuming one of electric power generated by a generator that uses renewable energy and electric power received from a power grid, selected at each time; a first storage device that consumes the generated electric power and stores first hydrogen produced by the hydrogen production device; and a second storage device that consumes the received electric power and stores second hydrogen produced by the hydrogen production device, and the control device selects at each time one of the generated electric power and the received electric power as input power to the hydrogen production device.

[0037] According to this configuration, the first hydrogen can be stored in the first storage device during the time when the generated power is selected. Furthermore, the second hydrogen can be stored in the second storage device during the time when the received power is selected. In this way, a single hydrogen production device can produce the first hydrogen and the second hydrogen in a time-division manner and store each hydrogen separately. This allows a single hydrogen production device to perform switching control, such as consuming the received power to produce the second hydrogen during times when the amount of generated power is low, and consuming the generated power to produce the first hydrogen during times when the received power rate is high. This enables efficient hydrogen production. Furthermore, separate storage devices are used depending on the type of power used to produce hydrogen. Therefore, by changing the mixing ratio of the first hydrogen and the second hydrogen, the amount of CO2 emissions from the produced hydrogen can be controlled.

[0038] (13) A hydrogen production method according to another embodiment of the present disclosure includes the steps of: a hydrogen production device producing hydrogen by consuming one of electric power generated by a generator using renewable energy and electric power received from a power grid, selected at each time; storing first hydrogen produced by the hydrogen production device by consuming the generated electric power in a first storage device; and storing second hydrogen produced by the hydrogen production device by consuming the received electric power in a second storage device.

[0039] According to this configuration, during the time when the generated power is selected, the first hydrogen produced using the generated power as the power consumed by the hydrogen production device is stored in the first storage device. Furthermore, during the time when the received power is selected, the second hydrogen produced using the received power as the power consumed by the hydrogen production device is stored in the second storage device. In this way, a single hydrogen production device can produce the first hydrogen and the second hydrogen in a time-division manner and store each hydrogen separately. This allows for switching control using a single hydrogen production device, such as consuming the received power to produce the second hydrogen during times when the amount of generated power is low, and consuming the generated power to produce the first hydrogen during times when the received power rate is high. This enables efficient hydrogen production. Furthermore, separate storage devices are used depending on the type of power used to produce hydrogen. Therefore, by changing the mixing ratio of the first hydrogen and the second hydrogen, the CO2 emissions from the produced hydrogen can be controlled.

[0040] [Details of the embodiments of the present disclosure] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below represents a specific example of the present disclosure. The numerical values, shapes, materials, components, component placement and connection configurations, steps, and step order shown in the following embodiments are examples and do not limit the present disclosure. Furthermore, among the components in the following embodiments, components not recited in independent claims are components that can be added arbitrarily. Furthermore, each figure is a schematic diagram and is not necessarily a precise illustration.

[0041] The same components are denoted by the same reference numerals, and their functions and names are also the same, so their explanations will be omitted as appropriate.

[0042] <Embodiment 1> [Overall configuration of hydrogen production system] FIG. 1 is a diagram showing the overall configuration of a hydrogen production system according to a first embodiment of the present disclosure.

[0043] The hydrogen production system 1 includes a solar power generator 3, a switching switch 4, a hydrogen production device 5, valves 6 and 7, a system hydrogen tank 8, a renewable energy hydrogen tank 9, valves 10 and 11, a mixed hydrogen tank 12, a control device 13, and a display device 14.

[0044] The solar power generator 3 is an example of a renewable energy generator that generates electricity using renewable energy and converts solar energy into DC power. In this embodiment, an example will be described in which the solar power generator 3 is used as a renewable energy generator, but other renewable energy generators such as a wind power generator may be used instead of or together with the solar power generator 3.

[0045] In FIG. 1, a DC / AC converter or PCS (power conditioner) that converts the power generated by the solar power generator 3 from direct current to alternating current is not shown.

[0046] The changeover switch 4 is connected to the power grid 2, the solar power generator 3, the hydrogen production device 5, and the control device 13. The changeover switch 4 receives as input the received power from the power grid 2 and the power generated by the solar power generator 3, selects one of the power sources based on a switching instruction signal transmitted from the control device 13, and outputs the selected power to the hydrogen production device 5. For example, when the switching instruction signal indicates 1, it instructs the selection of the received power, and when it indicates 0, it instructs the selection of the generated power. When the switching instruction signal indicates 1, the changeover switch 4 connects the power grid 2 to the hydrogen production device 5, outputs the received power from the power grid 2 to the hydrogen production device 5, and does not output the generated power of the solar power generator 3 to the hydrogen production device 5. When the switching instruction signal indicates 0, the changeover switch 4 connects the solar power generator 3 to the hydrogen production device 5, outputs the generated power of the solar power generator 3 to the hydrogen production device 5, and does not output the received power from the power grid 2 to the hydrogen production device 5.

[0047] The hydrogen production device 5 uses the DC power output from the changeover switch 4 as power consumption to electrolyze water into hydrogen and oxygen and extract hydrogen. The hydrogen production device 5 employs, for example, a solid polymer water electrolysis method, in which oxygen and hydrogen ions are generated by supplying water to the positive electrode side, and the hydrogen ions are passed through a fluororesin cationic membrane or the like to move to the negative electrode side, thereby generating electrons and generating hydrogen. However, the water electrolysis method is not limited to the above. Other methods such as alkaline water electrolysis and high-temperature steam electrolysis may also be used as the water electrolysis method. Furthermore, the hydrogen production device 5 may generate hydrogen using methods other than water electrolysis, such as toluene electrolytic reduction. In the toluene electrolytic reduction method, toluene is used instead of water.

[0048] Valve 6 is a hydrogen supply valve installed midway in the hydrogen conduit connecting hydrogen production device 5 and system hydrogen tank 8, and is used to adjust the output amount of hydrogen generated by hydrogen production device 5. By opening valve 6, hydrogen produced by hydrogen production device 5 is output to system hydrogen tank 8, and additional hydrogen is stored in system hydrogen tank 8. By closing valve 6, hydrogen produced by hydrogen production device 5 is no longer output to system hydrogen tank 8.

[0049] Valve 7 is a hydrogen supply valve installed midway in the hydrogen conduit connecting the hydrogen production device 5 and the renewable energy hydrogen tank 9, and is used to adjust the output amount of hydrogen generated by the hydrogen production device 5. By opening valve 7, hydrogen produced by the hydrogen production device 5 is output to the renewable energy hydrogen tank 9, and additional hydrogen is stored in the renewable energy hydrogen tank 9. By closing valve 7, hydrogen produced by the hydrogen production device 5 is no longer output to the renewable energy hydrogen tank 9.

[0050] The opening and closing control of valves 6 and 7 is performed based on an opening and closing instruction signal output from control device 13. For example, valve 6 opens when the opening and closing instruction signal indicates 1, and closes valve 7 when the opening and closing instruction signal indicates 0. Similarly, valve 7 opens when the opening and closing instruction signal indicates 1, and closes valve 7 when the opening and closing instruction signal indicates 0.

[0051] It is assumed that there is no case where the opening / closing instruction signal to valve 6 and the opening / closing instruction signal to valve 7 indicate 1 at the same time. In other words, when the opening / closing instruction signal to valve 6 indicates 1, the opening / closing instruction signal to valve 7 indicates 0. Furthermore, when the opening / closing instruction signal to valve 7 indicates 1, the opening / closing instruction signal to valve 6 indicates 0. This makes it possible to store hydrogen output from the hydrogen production device 5 at any given time in either the system hydrogen tank 8 or the renewable energy hydrogen tank 9, but not in both.

[0052] Specifically, when the switching instruction signal indicates 1, the opening / closing instruction signal for valve 6 indicates 1, and the opening / closing instruction signal for valve 7 indicates 0. As a result, hydrogen produced by hydrogen production device 5 using power received from power grid 2 is stored in system hydrogen tank 8.

[0053] Furthermore, when the switching instruction signal indicates 0, the opening / closing instruction signal for valve 6 indicates 0, and the opening / closing instruction signal for valve 7 indicates 1. As a result, the hydrogen produced by hydrogen production device 5 using the power generated by solar power generator 3 is stored in renewable energy hydrogen tank 9.

[0054] The system hydrogen tank 8 is connected to the valve 6 via a hydrogen pipe, and is a tank for storing hydrogen generated in the hydrogen production device 5.

[0055] The renewable energy hydrogen tank 9 is connected to the valve 7 via a hydrogen pipe, and is a tank for storing the hydrogen generated in the hydrogen production device 5.

[0056] Each of the system hydrogen tank 8 and the renewable energy hydrogen tank 9 is, for example, a tank that stores hydrogen compressed at high pressure. However, the method of storing hydrogen in each hydrogen tank is not limited to this. Each hydrogen tank may, for example, be a tank that liquefies hydrogen at low temperature and stores it. Furthermore, each hydrogen tank may be a tank that stores hydrogen by absorbing it into a hydrogen storage alloy, or a tank that stores hydrogen by adsorbing it into carbon nanotubes or the like. Furthermore, each hydrogen tank may be a tank that stores hydrogen by converting it into another substance, such as by reacting hydrogen with toluene to convert it into methylcyclohexane.

[0057] Valve 10 is a hydrogen supply valve installed midway in the hydrogen conduit connecting system hydrogen tank 8 and mixed hydrogen tank 12, and is used to adjust the output amount of hydrogen stored in system hydrogen tank 8. The more valve 10 is opened, the more hydrogen can be output from system hydrogen tank 8 to mixed hydrogen tank 12. By completely closing valve 10, it is possible to prevent hydrogen from being output from system hydrogen tank 8.

[0058] Valve 11 is a hydrogen supply valve installed midway along the hydrogen conduit connecting renewable hydrogen tank 9 and mixed hydrogen tank 12, and is used to adjust the amount of hydrogen output stored in renewable hydrogen tank 9. The more valve 11 is opened, the more hydrogen can be output from renewable hydrogen tank 9 to mixed hydrogen tank 12. By completely closing valve 11, it is possible to prevent hydrogen from being output from renewable hydrogen tank 9.

[0059] Valve 10 and valve 11 function as a mixer that mixes the hydrogen stored in system hydrogen tank 8 and renewable energy hydrogen tank 9.

[0060] The opening and closing control of valves 10 and 11 is performed based on an opening and closing instruction signal output from control device 13. For example, the opening and closing instruction signal indicates the opening and closing amount of valves 10 and 11 as a numerical value between 0 and 1. An opening and closing instruction signal of 1 indicates that the valves are to be fully opened, and an opening and closing instruction signal of 0 indicates that the valves are to be fully closed. Furthermore, an opening and closing instruction signal of 0.3 indicates that the valves are to be opened by an opening and closing amount that is 0.3 times the opening and closing amount when fully open, which is 1.

[0061] The mixed hydrogen tank 12 is connected to the valves 10 and 11 via hydrogen pipes, and is a tank for storing the hydrogen stored in the system hydrogen tank 8 and the renewable energy hydrogen tank 9.

[0062] The mixed hydrogen tank 12 is, for example, a tank that stores hydrogen compressed at high pressure, similar to the system hydrogen tank 8 and the renewable energy hydrogen tank 9. However, the method of storing hydrogen using the mixed hydrogen tank 12 is not limited to this. The mixed hydrogen tank 12 may be, for example, a tank that liquefies hydrogen at low temperature and stores it. The mixed hydrogen tank 12 may also be a tank that stores hydrogen by absorbing it into a hydrogen storage alloy, or a tank that stores hydrogen by adsorbing it into carbon nanotubes or the like. The mixed hydrogen tank 12 may also be a tank that stores hydrogen by converting it into another substance, such as by reacting hydrogen with toluene to convert it into methylcyclohexane.

[0063] The control device 13 selects, on an hourly basis, either the power received from the power grid 2 or the power generated by the solar power generator 3 as the input power for the hydrogen production device 5. Based on the selection result, the control device 13 controls the changeover switch 4, the hydrogen production device 5, the valve 6, and the valve 7.

[0064] That is, when receiving power is selected, the control device 13 transmits a switching control signal to the changeover switch 4 to connect the power grid 2 and the hydrogen production device 5. The control device 13 also transmits an opening / closing instruction signal to the control device of valve 6 to open the valve 6, and transmits an opening / closing instruction signal to the control device of valve 7 to close the valve 7.

[0065] Furthermore, when generating power is selected, the control device 13 transmits a switching control signal to the switching switch 4 to connect the solar power generator 3 and the hydrogen production device 5. The control device 13 also transmits an opening / closing instruction signal to the control device of valve 6 to close valve 6, and transmits an opening / closing instruction signal to the control device of valve 7 to open valve 7.

[0066] The control device 13 determines the opening and closing amounts of the valves 10 and 11 based on the target value of carbon dioxide (hereinafter referred to as CO2) emissions, and transmits opening and closing instruction signals to the valves 10 and 11, respectively, to instruct the determined opening and closing amounts.

[0067] The control device 13 also displays the operating status of the hydrogen production system 1 on the display device 14. Display examples of the display device 14 will be described later.

[0068] [Configuration of control device 13] FIG. 2 is a block diagram showing the hardware configuration and functional configuration of the control device 13 according to the first embodiment of the present disclosure.

[0069] The control device 13 is, for example, a computer, and includes a control unit 21, a communication unit 22, and a storage unit 23, which are interconnected via a bus 30.

[0070] The control unit 21 is configured to include a CPU (Central Processing Unit) and is equipped with a target value acquisition unit 24, an emission amount acquisition unit 25, a generated power amount acquisition unit 26, a determination unit 27, a command transmission unit 28, and a display control unit 29 as functional processing units realized by executing a computer program pre-stored in the memory unit 23.

[0071] The communication unit 22 is composed of communication devices that execute communication processing with each device, such as the solar power generator 3, the changeover switch 4, the hydrogen production device 5, the control devices for the valves 6, 7, 10 and 11, the control device for the system hydrogen tank 8, the control device for the renewable energy hydrogen tank 9, and a watt-hour meter for monitoring the received power provided at the power receiving point of the hydrogen production system 1. In other words, the communication unit 22 transmits information given from the control unit 21 to each device via the communication line, and also gives information received from each device via the communication line to the control unit 21.

[0072] The storage unit 23 is configured by a volatile memory element such as an SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory), a non-volatile memory element such as a flash memory or an EEPROM (Electrically Erasable Programmable Read-Only Memory), or a magnetic storage device such as a hard disk, etc. The storage unit 23 stores the computer program executed by the control unit 21, data necessary for the execution thereof, etc.

[0073] The target value acquisition unit 24 acquires a target value of the amount of CO2 emissions during hydrogen production by the hydrogen production device 5. Specifically, the target value acquisition unit 24 acquires a standard CO2 emission amount CO2 Base [kg / Nm 3 ] and CO2 tolerance rate CO2 Rate [% / 100] is read out from the storage unit 23 as a target value.

[0074] CO2 emissionsCO2 Base For example, hydrogen can be produced by reforming natural gas to 1 Nm 3 Indicates the weight [kg] of CO2 generated when produced.

[0075] CO2 Tolerance RateCO2 Rate CO2 emissionsCO2 Base This shows the allowable rate of CO2 emissions from the hydrogen production device 5 when CO2 is used as the standard. RateCO2 emissions Base multiplied by (CO2 Rate ×CO2 Base ) is produced by hydrogen production equipment 5, and hydrogen is 3 Indicates the target value for the weight [kg] of CO2 generated when manufactured.

[0076] The emission acquisition unit 25 acquires the CO2 emissions in the production of the power generated by the solar power generator 3 and the power received from the power grid 2. Specifically, the emission acquisition unit 25 acquires the CO2 emissions in the production of the power generated by the solar power generator 3, which are stored in advance in the storage unit 23. Pv (t) [kg / kWh] and CO2 emissions in the production of electricity received from power grid 2 Grid (t) [kg / kWh] is read out from the storage unit 23. Here, t indicates a target period, for example, a period in 30-minute units.

[0077] The generated power amount acquiring unit 26 acquires the amount of power generated by the solar power generator 3. Specifically, the generated power amount acquiring unit 26 acquires the amount of power generated by the solar power generator 3 for each target period t, which is stored in advance in the storage unit 23. Pv (t) [kWh] is read from the memory unit 23.

[0078] The determination unit 27 determines the target value of CO2 emissions (CO2 Base , CO2 Rate ) and CO2 emissionsCO2 Pv (t) and CO2 Grid (t) and the amount of generated power P Pv Based on (t), the amount of power received from power grid 2 P Grid Determine (t) [kWh].

[0079] Hereinafter, the amount of received power P Grid The method for determining (t) [kWh] is explained in more detail below.

[0080] The determination unit 27 determines the amount of power received from the power grid 2 P by optimizing a predetermined objective function under the constraint that the amount of power input to the hydrogen production device 5 does not exceed the rated input power amount of the hydrogen production device 5 for each hour. Grid Determine (t).

[0081] For example, the determination unit 27 determines the amount of power received from the power grid 2 P by maximizing the objective function shown in Equation 1 under the constraints shown in Equation 14 to Equation 17 below. Grid (t) is determined. The amount of power received P Grid A predetermined mathematical optimization method is used to determine (t).

[0082] Next, each formula will be explained. <<Objective function>> Hydrogen production volume [Nm 3 ]:Total H2 (t max ) Maximization ... (Equation 1)

[0083] Equation 1 shows the objective function optimized by the determination unit 27, and here, the total amount of hydrogen produced by the hydrogen production device 5 from the target period 0 to tmax, H2 (t max ) is the objective function.

[0084] <<parameters>> Power generation amount of solar power generator 3 (predicted value) [kWh]: P Pv (t) …(Formula 2) CO2 emissions from grid electricity [kg / kWh]:CO2 Grid (t) …(Formula 3) CO2 emissions from solar power generator 3 [kg / kWh]: CO2 Pv (t) …(Formula 4) Standard CO2 emissions [kg / Nm 3 ]:CO2 Base …(Formula 5) CO2 tolerance rate [% / 100]:CO2 Rate …(Formula 6) Hydrogen production efficiency [Nm 3 / kWh]:ξ …(Equation 7) Rated input power of hydrogen production device 5 [kWh]: P WE_rate …(Formula 8)

[0085] Equations 2 to 8 show parameters necessary for calculating the objective function or the constraint conditions described below.

[0086] Equation 2 is the amount of power generated by the photovoltaic power generator 3 in the target period t acquired by the power generation amount acquisition unit 26 P Pv (t) [kWh]. Power generation amount P Pv (t) is a predicted value based on meteorological information such as the weather and temperature on the day.

[0087] Equation 3 is the CO2 emission CO2 obtained by the emission acquisition unit 25 in the production of power received from the power grid 2 during the target period t. Grid (t) [kg / kWh].

[0088] Equation 4 is the CO2 emissions CO2 obtained by the emission acquisition unit 25 in the production of power generated by the solar power generator 3 during the target period t. Pv (t) [kg / kWh].

[0089] Equation 5 is the reference CO2 emission CO2 acquired by the target value acquisition unit 24. Base [kg / Nm 3 ] is shown.

[0090] Equation 6 is the CO2 tolerance rate CO2 Rate Shows [% / 100].

[0091] The hydrogen production efficiency ξ shown in Equation 7 is the amount of hydrogen produced per kWh of input power to the hydrogen production device 5 [Nm 3 ] is shown.

[0092] Equation 8 is the rated input power P of the hydrogen production device 5 WE_rate Shows [kWh].

[0093] The values ​​of Equation 7 and Equation 8 are stored in advance in the storage unit 23, and the determination unit 27 reads these values ​​from the storage unit 23.

[0094] <<variable>> Target period: t[0,1,…,tmax] …(Formula 9) Grid connection mode: Mode(t)[0,1] …(Equation 10) Received power amount [kWh]:P Grid (t) …(Formula 11) Input power of hydrogen production device 5 [kWh]: P WE (t) …(Formula 12) Hydrogen production volume [Nm 3 ]:Total H2 (t) …(Formula 13)

[0095] Equations 9 to 13 show variables used when calculating the objective function or constraints.

[0096] Equation 9 is a variable representing the target period t, where t indicates a period from 0 to tmax (tmax+1). Each period is, for example, 30 minutes corresponding to the demand time limit. However, the length of the period is not limited to 30 minutes.

[0097] Equation 10 is a variable that indicates whether the hydrogen production system 1 is connected to the grid.

[0098] When the grid-connected mode Mode[t] is 1, it indicates that the hydrogen production system 1 is grid-connected during the target period t. When the system is grid-connected, the changeover switch 4 connects the power grid 2 and the hydrogen production device 5, inputs the power received from the power grid 2 to the hydrogen production device 5, and does not input the power generated by the solar power generator 3 to the hydrogen production device 5. In addition, the valve 6 is open and the valve 7 is closed.

[0099] On the other hand, when the grid connection mode Mode[t] is 0, it indicates that the hydrogen production system 1 is not grid-connected during the target period t. When not grid-connected, the changeover switch 4 connects the solar power generator 3 and the hydrogen production device 5, inputs the power generated by the solar power generator 3 to the hydrogen production device 5, and does not input the power received from the power grid 2 to the hydrogen production device 5. In addition, the valve 6 is closed and the valve 7 is open.

[0100] That is, the grid-connected mode Mode[t] is a variable indicating the power selected as input power to the hydrogen production device 5 from the power received from the power grid 2 and the power generated by the solar power generator 3 for each target period t.

[0101] Equation 11 expresses the amount of power received from power grid 2 during the target period t, P Grid (t) [kWh] is shown.

[0102] Equation 12 is the input power P to the hydrogen production device 5 during the target period t. WE (t) [kWh] is shown.

[0103] Equation 13 is the amount of hydrogen produced by the hydrogen production device 5 from the target period 0 to the target period t [Nm 3 ] is shown.

[0104] <<Restrictions>> P Grid (t) × Mode(t) + P Pv (t) × (1-Mode(t)) =P WE (t) …(Formula 14) Total co2 (t)=Total co2 (t-1) +CO2 Grid (t-1)×P Grid (t-1) +CO2 Pv (t-1)×P Pv (t-1) …(Formula 15) Total H2 (t)=Total H2 (t-1)+P WE (t-1)×ξ …(Formula 16) P WE (t)≦P WE_rate …(Formula 17)

[0105] Equations 14 to 17 represent constraints when maximizing the objective function shown in equation 1.

[0106] Equation 14 expresses the amount of power received from power grid 2 during the target period t, P Grid (t) and the amount of power generated by solar power generator 3 during the target period t, P Pv The sum of (t) is the input power amount P WE Furthermore, Equation 14 indicates, using the variable Mode(t), that power is input to the hydrogen production device 5 from only one of the power grid 2 and the solar power generator 3 during the same target period t.

[0107] Equation 15 is the total CO2 emissions from target period 0 to target period t. co2 (t) is the total CO2 emissions from the target period 0 to the target period t-1. co2 At (t-1), CO2 emissions from the production of electricity received from power grid 2 are Grid (t-1)×P Grid (t-1) and CO2 emissions in the production of electricity generated by solar power generator 3, CO2 Pv (t-1)×P Pv It indicates that it is equal to the value obtained by adding (t-1).

[0108] Equation 16 is the total amount of hydrogen produced from 0 to t. H2 (t) is the total amount of hydrogen produced from 0 to t-1 H2 (t-1), the input power P WE It is shown that this is equal to the sum of the product of (t-1) and the hydrogen production efficiency ξ.

[0109] Equation 17 is the input power P of the hydrogen production device 5 during the target period t. WE (t) is the rated input power P of the hydrogen production device 5 WE_rate Show that:

[0110] 1 and 2 again, the command transmitting unit 28 generates a switching instruction signal for the changeover switch 4 based on the grid interconnection mode Mode[t] for each target period t. That is, if the grid interconnection mode Mode[t] is 1 in the target period t, the command transmitting unit 28 generates a switching instruction signal indicating 1. Also, if the grid interconnection mode Mode[t] is 0 in the target period t, the command transmitting unit 28 generates a switching instruction signal indicating 0. The command transmitting unit 28 transmits the generated switching instruction signal to the changeover switch 4 or a control device that controls opening and closing by the changeover switch 4.

[0111] Furthermore, the command transmitting unit 28 generates switching instruction signals for the valves 6 and 7 based on the grid connection mode Mode[t] for each target period t. That is, when the grid connection mode Mode[t] is 1 during the target period t, the command transmitting unit 28 generates an opening / closing instruction signal for the valve 6 that indicates 1, and an opening / closing instruction signal for the valve 7 that indicates 0. Furthermore, when the grid connection mode Mode[t] is 0 during the target period t, the command transmitting unit 28 generates an opening / closing instruction signal for the valve 6 that indicates 0, and an opening / closing instruction signal for the valve 7 that indicates 1. The command transmitting unit 28 transmits the generated opening / closing instruction signal for the valve 6 to the control device of the valve 6, and transmits the generated opening / closing instruction signal for the valve 7 to the control device of the valve 7.

[0112] The command transmission unit 28 generates an open / close command signal for the valve 10 and the valve 11. That is, the command transmission unit 28 determines the mixing ratio of the hydrogen stored in the system hydrogen tank 8 and the hydrogen stored in the renewable energy hydrogen tank 9. That is, the command transmission unit 28 determines the mixing ratio of the hydrogen stored in the system hydrogen tank 8 and the hydrogen stored in the renewable energy hydrogen tank 9. Rate ×CO2 Base ) and CO2 Pv (t) and CO2 Grid In other words, the command transmission unit 28 determines the mixing ratio based on the amount of hydrogen stored in the renewable energy hydrogen tank 9. 3 The weight of CO2 per kg is the target CO2 Base ×CO2 Rate The mixing ratio is determined as follows:

[0113] The method for determining the mixture ratio, i.e., the output amount of hydrogen stored in the system hydrogen tank 8 and the renewable energy hydrogen tank 9, will be described in detail. Grid (t)×P Grid Calculate the integrated value of (t) / 3600, where CO2 Grid (t)×P Grid (t) / 3600 = Total CO2 Grid (t) [kg]. Similarly, the command transmission unit 28 Pv (t)×P Pv Calculate the integrated value of (t) / 3600, where CO2 Pv (t)×P Pv (t) / 3600 = Total CO2 Pv (t) [kg].

[0114] The command transmission unit 28 Grid (t) and TotalCO2 Pv Based on (t), the remaining amount of hydrogen in the renewable hydrogen tank 9 TANK1(t), the remaining amount of hydrogen in the system hydrogen tank 8 TANK2(t) [Nm3], and the required amount of hydrogen HyDemand [Nm3], the amount of hydrogen to be output from the renewable hydrogen tank 9 HyTank1 [Nm3] and the amount of hydrogen to be output from the system hydrogen tank 8 HyTank2 [Nm3] are calculated so as to satisfy the following equations 18 and 19. HyDemand=HyTank1+HyTank2 …(Formula 18) HyTank1×(Total CO2 Grid (t) / TANK1(t)) + HyTank2 × (Total CO2 Pv (t) / TANK2(t)) =CO2Rate×CO2Base…(Equation 19)

[0115] The command transmission unit 28 monitors the amount of power flowing through the power receiving point of the hydrogen production system 1, and determines the amount of power flowing through the power receiving point P Grid The input power amount P to the hydrogen production device 5 is set to match (t). WE(t) is determined according to Equation 14. The command transmission unit 28 determines the input power amount P WE The hydrogen production device 5 receives the command from the command transmission unit 28 and transmits a command including the input power amount P WE The amount of input power to the hydrogen production device 5 during the target period t is controlled so as to coincide with (t).

[0116] The display control unit 29 causes the screen of the display device 14 to display the amount of hydrogen stored in the system hydrogen tank 8 and the amount of carbon dioxide emission for producing that hydrogen, and the amount of hydrogen stored in the renewable energy hydrogen tank 9 and the amount of carbon dioxide emission for producing that hydrogen. The display control unit 29 also causes the screen of the display device 14 to display the generated power and received power input to the hydrogen production device 5. The display control unit 29 also causes the screen of the display device 14 to display the amount of CO2 emission in the production of the generated power and received power, respectively.

[0117] FIG. 3 is a diagram showing an example of a screen display by the display control unit 29 according to the first embodiment of the present disclosure.

[0118] For example, in graph 71, the storage rate of hydrogen in the system hydrogen tank 8 is shown by the hatched area. 3 The CO2 emissions generated during hydrogen production by the hydrogen production device 5 are AAA [kg / Nm 3 ], which numerically indicates that the standard CO2 emission ratio is 35[%]. Here, the standard CO2 emission ratio indicates the ratio of CO2 emissions in the production of electricity consumed in hydrogen production by the hydrogen production device 5 (received electricity input to the hydrogen production device 5) to the target value of CO2 emissions.

[0119] In addition, in graph 72, the storage rate of hydrogen in the renewable energy hydrogen tank 9 is shown by the hatched area. 3 The CO2 emissions generated during hydrogen production by the hydrogen production device 5 are BBB [kg / Nm 3], which indicates that the standard CO2 emission ratio is 4%. Here, the standard CO2 emission ratio indicates the ratio of CO2 emissions in the production of electricity consumed in hydrogen production by the hydrogen production device 5 (generated electricity input to the hydrogen production device 5) to the target value of CO2 emissions.

[0120] It also shows that the received power from the power grid 2 that is input to the hydrogen production device 5 is P [kW], and the generated power of the solar power generator 3 that is input to the hydrogen production device 5 is Q [kW]. It also shows that the input power of the hydrogen production device 5 is W [kW].

[0121] It also shows that the amount of CO2 emissions in producing the power received from the power grid 2 is xxx [kg / kWh]. It also shows that the amount of CO2 emissions in producing the power generated by the solar power generator 3 is yyy [kg / kWh].

[0122] [Processing flow of the control device 13] FIG. 4 is a flowchart showing an example of a processing procedure of the control device 13 according to the first embodiment of the present disclosure.

[0123] The target value acquisition unit 24 acquires the target value of CO2 emissions (CO2 Base , CO2 Rate ) is read from the storage unit 23 (S1).

[0124] The emission acquisition unit 25 acquires the CO2 emissions CO2 Grid (t) is read from the storage unit 23 (S2).

[0125] The emission acquisition unit 25 acquires the CO2 emissions CO2 Pv (t) is read from the storage unit 23 (S3).

[0126] The generated power amount acquisition unit 26 acquires the generated power amount P Pv (t) is read from the storage unit 23 (S4).

[0127] The determination unit 27 determines the value of each variable by maximizing the objective function shown in Equation 1 under the constraints shown in Equations 14 to 17 (S5).

[0128] The command transmitting unit 28 generates a switching instruction signal for the changeover switch 4, an opening / closing instruction signal for the valve 6, and an opening / closing instruction signal for the valve 7 for each target period t based on the determined grid interconnection mode Mode(t). The command transmitting unit 28 transmits the generated switching instruction signals to the changeover switch 4. Furthermore, the command transmitting unit 28 transmits the generated opening / closing instruction signal for the valve 6 to the control device of the valve 6, and transmits the generated opening / closing instruction signal for the valve 7 to the control device of the valve 7 (S6).

[0129] The command transmission unit 28 transmits the determined input power amount P WE A command including (t) is sent to the hydrogen production device 5 (S6).

[0130] [Effects of the First Embodiment] As explained above, the hydrogen production device 5 produces hydrogen by consuming either the power generated by the solar power generator 3 that uses renewable energy or the power received from the power grid 2, whichever is selected on an hourly basis. Furthermore, the renewable energy hydrogen tank 9 consumes the generated power and stores the first hydrogen produced by the hydrogen production device 5. The system hydrogen tank 8 consumes the received power and stores the second hydrogen produced by the hydrogen production device 5.

[0131] In other words, during the time when the generated power is selected, the first hydrogen produced using the generated power as the power consumed by the hydrogen production device 5 is stored in the renewable energy hydrogen tank 9. Furthermore, during the time when the received power is selected, the second hydrogen produced using the received power as the power consumed by the hydrogen production device 5 is stored in the system hydrogen tank 8. In this way, a single hydrogen production device 5 can produce the first hydrogen and the second hydrogen in a time-division manner and store each hydrogen separately. This makes it possible to use a single hydrogen production device 5 to perform switching control, such as consuming the received power to produce the second hydrogen during times when the amount of generated power is low, and consuming the generated power to produce the first hydrogen during times when the received power rate is high. This enables efficient hydrogen production. Furthermore, separate storage devices are used depending on the type of power used to produce hydrogen. Therefore, by changing the mixing ratio of the first hydrogen and the second hydrogen, the CO2 emissions from the produced hydrogen can be controlled.

[0132] Furthermore, the mixer (valves 10, 11) mixes the first hydrogen stored in the renewable energy hydrogen tank 9 with the second hydrogen stored in the system hydrogen tank 8. Therefore, the mixer can mix the first hydrogen and the second hydrogen at an appropriate ratio. This makes it possible to control the CO2 emissions from the produced hydrogen by changing the hydrogen mixing ratio.

[0133] Furthermore, the control device 13 selects either the generated power or the received power on an hourly basis as the input power to the hydrogen production device 5. Therefore, the control device 13 can cause one hydrogen production device 5 to produce the first hydrogen and the second hydrogen in a time-division manner, thereby enabling efficient hydrogen production.

[0134] The control device 13 also includes a generated power amount acquisition unit 26 that acquires the amount of power generated by the solar power generator 3, and a determination unit 27 that determines the amount of power to be received from the power grid based on the rated input power amount of the hydrogen production device 5 and the amount of power generated, and selects one of the generated power and the received power for each hour. Therefore, the control device 13 can cause the hydrogen production device 5 to consume one of the generated power and the received power for each hour, causing the hydrogen production device 5 to produce the first hydrogen and the second hydrogen.

[0135] The determination unit 27 determines the amount of received power by optimizing a predetermined objective function under the constraint that the amount of power input to the hydrogen production device 5 does not exceed the rated input power amount for each hour. Therefore, the determination unit 27 can optimize the predetermined objective function while ensuring that the amount of power input to the hydrogen production device 5 does not exceed the rated input power amount for each hour. For example, by optimizing the objective function to maximize the amount of hydrogen production, efficient hydrogen production becomes possible.

[0136] Furthermore, the display control unit 29 displays on the screen the amount of hydrogen stored in the renewable energy hydrogen tank 9 and the amount of carbon dioxide emitted for producing that hydrogen, and the amount of hydrogen stored in the system hydrogen tank 8 and the amount of carbon dioxide emitted for producing that hydrogen. This allows the user to know what percentage of carbon dioxide is being emitted in hydrogen production.

[0137] The display control unit 29 also displays on the screen the generated power and received power input to the hydrogen production device 5. This allows the user to know how much generated power and received power is being used for hydrogen production.

[0138] Furthermore, the display control unit 29 displays on the screen the amount of carbon dioxide emissions in the production of each of the generated power and the received power. That is, the amount of carbon dioxide emissions in the production of the generated power and the received power are displayed on the screen along with the values ​​of the generated power and the received power. This allows the user to know the amount of carbon dioxide emissions in the production of hydrogen. For example, by multiplying the value of the received power by the amount of carbon dioxide emissions in the production of the received power, the user can know the amount of carbon dioxide emissions in the production of hydrogen stored in the system hydrogen tank 8.

[0139] Furthermore, the control device 13 controls the mixing ratio of the hydrogen stored in the system hydrogen tank 8 and the hydrogen stored in the renewable energy hydrogen tank 9 via the valves 10 and 11 based on the target value of carbon dioxide emissions during hydrogen production. This allows the two types of hydrogen to be mixed according to the target value. This makes it possible to control the amount of carbon dioxide emissions from the hydrogen produced.

[0140] <Variation 1> The constraints shown in the first embodiment above may include the constraints shown below. CO2 Base ×CO2 Rate ≧Total co2 (t max ) / Total H2 (t max ) …(Formula 20)

[0141] Equation 20 is the hydrogen production time from 0 to tmax (1Nm 3 Total CO2 emissions per co2 (t max ) / Total H2 (t max ) is 1Nm by hydrogen production device 5 3 Target value for the weight [kg] of CO2 generated during hydrogen production Base ×CO2 Rate Show that:

[0142] <Variation 2> In the above-described embodiment or variant 1, the determination unit 27 determines the value of each variable by maximizing the amount of hydrogen produced (Equation 1), but the objective function is not limited to that shown in Equation 1. For example, the sub-objective function shown in the following Equation 21 or Equation 22 may be used as the objective function.

[0143] The determination unit 27 optimizes the sub-objective function shown in Equation 21 or Equation 22 under the constraint conditions shown in Equation 14 to Equation 17 and the sub-constraint conditions shown in Equation 37 to Equation 48 below, thereby determining the amount of power received from the power grid 2 P Grid Determine (t).

[0144] Next, each formula will be explained. <<Sub-objective function>> Total cost of hydrogen production [yen]: TotalCost H2 (t max ) Minimization of (Equation 21) Operating rate of hydrogen production device 5 [% / 100]: TotalRate(t max ) maximization …(Formula 22)

[0145] Equation 21 shows the objective function optimized by the determination unit 27, and here, the total cost of hydrogen production by the hydrogen production device 5 from the target period 0 to tmax, TotalCost H2 (t max ) is the optimization of the objective function.

[0146] Equation 22 shows the objective function to be optimized by the determination unit 27. Here, the operation rate TotalRate(t max ) is the optimization of the objective function.

[0147] <<Subparameters>> Grid electricity unit price [yen / kWh]: Cost(t) ... (Equation 23) Renewable hydrogen tank 9 tank capacity limit [Nm 3 ]:T HL1 …(Formula 24) Lower limit of tank capacity of renewable hydrogen tank 9 [Nm 3]:T LL1 …(Formula 25) Tank capacity limit of system hydrogen tank 8 [Nm 3 ]:T HL2 …(Formula 26) Lower limit of tank capacity of system hydrogen tank 8 [Nm 3 ]:T LL2 …(Formula 27) Hydrogen production unit 5 operating rate limit [% / 100]: R HL …(Formula 28) Lower limit of operation rate of hydrogen production unit 5 [% / 100]: R LL …(Formula 29)

[0148] Equations 23 through 29 show the parameters needed to calculate the sub-objective functions or sub-constraints.

[0149] Equation 23 shows the system power unit cost Cost(t) [yen / kWh], which is the unit price of power received from the power grid 2 during the target period t.

[0150] Equation 24 is the upper limit of the capacity of the renewable hydrogen tank 9, the tank capacity upper limit T HL1 [Nm 3 ] is shown.

[0151] Equation 25 is the lower limit of the tank capacity T LL1 [Nm 3 ] is shown.

[0152] Formula 26 is the upper limit of the tank capacity T HL2 [Nm 3 ] is shown.

[0153] Equation 27 is the tank capacity lower limit T LL2 [Nm 3 ] is shown.

[0154] Equation 28 is the upper limit R of the operation rate of the hydrogen production device 5. HL Shows [% / 100].

[0155] Equation 29 is the lower limit R of the operation rate of the hydrogen production device 5.LL Shows [% / 100].

[0156] The values ​​of Equations 23 to 29 are stored in advance in the storage unit 23, and the determination unit 27 reads these values ​​from the storage unit 23.

[0157] <<Subvariable>> Total CO2 emissions during hydrogen production [kg]: Total co2 (t) …(Formula 30) Remaining hydrogen volume in renewable hydrogen tank 9 [Nm 3 ]:TANK1(t) …(Formula 31) Remaining hydrogen level in system hydrogen tank 8 [Nm 3 ]:TANK2(t) …(Formula 32) Purchased electricity cost [yen]: Total Cost Grid (t) …(Formula 33) Total input power of hydrogen production unit 5 [kWh]: TatalP WE (t) …(Formula 34) Total cost of hydrogen production [yen]: TotalCost H2 (t) …(Formula 35) Operating rate of hydrogen production device 5 [% / 100]: TotalRate(t) ... (Equation 36)

[0158] Equations 30 through 36 show the variables used in calculating the sub-objective functions or sub-constraints.

[0159] Equation 30 is the total CO2 emissions during hydrogen production by the hydrogen production device 5 from the target period 0 to the target period t. co2 (t) [kg] is shown.

[0160] Equation 31 is the remaining hydrogen amount TANK1(t) [Nm 3 ] is shown.

[0161] Equation 32 is the remaining hydrogen amount TANK2(t) [Nm 3 ] is shown.

[0162] Equation 33 is the total cost of electricity purchased from power grid 2 from target period 0 to target period t. Grid (t) indicates [circle].

[0163] Equation 34 is the total input power TatalP of the hydrogen production device 5 from the target period 0 to the target period t. WE (t) [kWh] is shown.

[0164] Equation 35 is the total cost required for hydrogen production by the hydrogen production device 5 from the target period 0 to the target period t, TotalCost H2 (t) indicates [circle].

[0165] Equation 36 represents the operation rate TotalRate(t) [% / 100] of the hydrogen production device 5 from the target period 0 to the target period t.

[0166] <<Sub-constraints>> Total Cost Grid (t)=TotalCost Grid (t-1) +Cost(t-1)×P Grid (t-1) …(Formula 37) Total Cost H2 (t)=TotalCost H2 (t-1) +Cost(t-1)×P Grid (t-1) …(Formula 38) TotalRate(t)=TatalP WE (t) / (t×P WE_rate ) …(Formula 39) TANK1(t)=TANK1(t-1) +P WE (t-1)×ξ×(1-Mode(t)) …(Formula 40) TANK1(t)≧T LL1 …(Formula 41) TANK1(t)≦T HL1 …(Formula 42) TANK2(t)=TANK2(t-1)+P WE (t-1)×ξ×Mode(t) …(Formula 43) TANK2(t)≧T LL2 …(Formula 44) TANK2(t)≦T HL2 …(Formula 45) TatalP WE (t)=TatalP WE (t-1)+P WE (t-1) …(Formula 46) TotalRate(t max )≧R LL …(Formula 47) TotalRate(t max )≦R HL …(Formula 48)

[0167] Equations 37 to 48 represent constraints when optimizing the sub-objective function shown in Equation 21 or Equation 22.

[0168] Equation 37 is the total cost of electricity purchased from power grid 2 from target period 0 to target period t. Grid (t) is the total cost of electricity purchased from power grid 2 from target period 0 to target period t-1. Grid (t-1), the grid power unit cost Cost(t-1) and the amount of power received from power grid 2 P Grid Indicates that the value is equal to the sum of the multiplied values ​​of (t-1).

[0169] Equation 38 is the total cost of hydrogen production from target period 0 to target period t. H2 (t) is the total cost of hydrogen production from target period 0 to target period t-1. H2 (t-1), the grid power unit cost Cost(t-1) and the amount of power received from power grid 2 P Grid Indicates that the value is equal to the sum of the multiplied values ​​of (t-1).

[0170] Equation 39 shows that the operation rate TotalRate(t) of the hydrogen production device 5 from the target period 0 to the target period t is calculated by dividing the total input power of the hydrogen production device 5 from the target period 0 to the target period t by the rated input power P WE_rateis equal to the value divided by the multiplied value of .

[0171] Equation 40 is the remaining amount of hydrogen in the renewable hydrogen tank 9 during the target period t, TANK1(t-1), multiplied by the input power P of the hydrogen production device 5 when the grid connection mode Mode(t) is 0. WE It is shown that it is equal to the value obtained by adding the product of (t-1) and the hydrogen production efficiency ξ.

[0172] Equation 41 shows that the remaining hydrogen amount TANK1(t) in the renewable hydrogen tank 9 during the target period t is calculated by the tank capacity lower limit T LL1 Indicates that this is the case.

[0173] Equation 42 shows that the remaining hydrogen amount TANK1(t) in the renewable hydrogen tank 9 during the target period t is equal to the tank capacity limit T HL1 Show that:

[0174] Equation 43 is expressed as follows: the remaining amount of hydrogen in the system hydrogen tank 8 during the target period t, TANK2(t), is the remaining amount of hydrogen in the system hydrogen tank 8 during the target period t-1, TANK2(t-1), multiplied by the input power P of the hydrogen production device 5 when the grid connection mode Mode(t) is 1. WE It is shown that it is equal to the value obtained by adding the product of (t-1) and the hydrogen production efficiency ξ.

[0175] Equation 44 shows that the remaining hydrogen amount TANK2(t) in the system hydrogen tank 8 during the target period t is calculated by the tank capacity lower limit T LL2 Indicates that this is the case.

[0176] Equation 45 shows that the remaining hydrogen amount TANK2(t) in the system hydrogen tank 8 during the target period t is equal to the tank capacity upper limit T HL2 Show that:

[0177] Equation 46 is the total input power TatalP of the hydrogen production device 5 from the target period 0 to the target period t. WE (t) is the total input power TatalP of the hydrogen production unit 5 from the target period 0 to the target period t-1. WE(t-1) The input power amount P of the hydrogen production device 5 WE Indicates that the value is the sum of (t-1).

[0178] Equation 47 is the operation rate TotalRate(t max ) is the lower limit R of the operation rate of the hydrogen production device 5 LL Indicates that this is the case.

[0179] Equation 48 is the operation rate TotalRate(t max ) is the upper limit R of the operation rate of the hydrogen production device 5 HL Show that:

[0180] <Variation 3> Instead of the constraint of Equation 20, the constraint of Equation 20A below may be used. CO2 Base ×CO2 Rate ≧Total co2 (t) / Total H2 (t) …(Formula 20A)

[0181] Equation 20A is the ratio of 1 Nm of hydrogen produced during the target period 0 to t for each target period t from 0 to tmax. 3 Total CO2 emissions per co2 (t) / Total H2 (t) is 1Nm by hydrogen production device 5 3 Target value for the weight [kg] of CO2 generated during hydrogen production Base ×CO2 Rate Show that:

[0182] <Variation 4> Instead of a predicted value, an actual measured value may be used as the amount of power generated by the photovoltaic power generator 3 shown in Equation 2, and the amount of power received from the power grid 2 may be determined in real time.

[0183] <Embodiment 2> In the first embodiment, the hydrogen production system 1 is configured without a storage battery, but in the second embodiment, a configuration in which the hydrogen production system 1 includes a storage battery will be described.

[0184] [Overall configuration of hydrogen production system] FIG. 5 is a diagram showing the overall configuration of a hydrogen production system according to the second embodiment of the present disclosure.

[0185] The hydrogen production system 1 shown in FIG. 5 further includes a storage battery 15 in addition to the configuration of the hydrogen production system 1 according to the first embodiment.

[0186] The storage battery 15 is connected to the solar power generator 3 via a power conditioner 16 (FIG. 6) and is charged with the output power of the solar power generator 3. The storage battery 15 also discharges the charged power. The storage battery 15 includes a secondary battery such as a redox flow (RF) battery, a lithium ion battery, a molten salt battery, or a lead storage battery.

[0187] The power conditioner 16 is connected to the storage battery 15 via a power line. The power conditioner 16 converts DC power output from the storage battery 15 into AC power and outputs the AC power.

[0188] The storage battery 15 receives command data for controlling the charge / discharge amount of the storage battery 15 from the control device 13, and controls the charge / discharge amount of the storage battery 15 based on the received command data.

[0189] The configuration of the control device 13 is the same as the configuration of the control device 13 according to the first embodiment shown in Fig. 2. However, some functions are different. The control device 13 controls the storage battery 15.

[0190] The emission acquisition unit 25 acquires the amount of CO2 emissions CO2 emitted in the production of electricity charged to the storage battery 15. BatThat is, the emission acquisition unit 25 acquires the amount of CO2 emissions CO2 in the production of the electricity charged in the storage battery 15 in the state after the storage battery 15 is charged, based on the amount of carbon dioxide emissions CO2 in the production of the electricity charged in the storage battery 15 in the state before the storage battery 15 is charged and the amount of carbon dioxide emissions CO2 in the production of the electricity charged in the storage battery 15. Bat Calculate CO2 emissions (t) Bat (t) is calculated using Equation 63 below.

[0191] The determination unit 27 determines the target value of CO2 emissions (CO2 Base , CO2 Rate ) and CO2 emissionsCO2 Pv (t), CO2 Grid (t) and CO2 Bat (t) and the amount of generated power P Pv Based on (t), the amount of power received from power grid 2 P Grid Determine (t) [kWh].

[0192] Hereinafter, the amount of received power P Grid The method for determining (t) [kWh] is explained in more detail below.

[0193] For example, the determination unit 27 determines the amount of power received from the power grid 2 P by maximizing the objective function shown in Equation 1 under the constraints shown in Equations 14 to 17 and the constraints shown in Equations 60 to 67 below. Grid (t) is determined. The amount of power received P Grid A predetermined mathematical optimization method is used to determine (t).

[0194] Next, each formula will be explained. <<parameters>> Charge / discharge efficiency [% / 100]: μ … (Equation 49) SOC upper limit [kWh]:SOC HL …(Formula 50) SOC lower limit [kWh]:SOC LL …(Formula 51)

[0195] Equations 49 through 51 show the parameters needed to calculate the objective function or constraints.

[0196] Equation 49 shows the charge / discharge efficiency [% / 100] of the storage battery 15 taking into consideration the conversion loss of the power conditioner 16 connected to the storage battery 15.

[0197] Formula 50 is the upper limit SOC (State of Charge) of the storage battery 15, which indicates the remaining charge of the storage battery 15. HL Shows [kWh].

[0198] Equation 51 is the lower limit SOC of the storage battery 15 LL Shows [kWh].

[0199] <<variable>> Storage battery AC output power amount [kWh]:P Bat_ac (t) …(Formula 52) Storage battery DC output power amount [kWh]:P Bat_dc (t) …(Formula 53) Battery discharge operation: S Bat_dcrg (t) [0,1] …(Formula 54) Battery charging operation: S Bat_crg (t) [0,1] …(Formula 55) Battery remaining capacity [kWh]: SOC(t) ... (Equation 56) CO2 emissions from storage battery [kg / kWh]:CO2 Bat (t) …(Formula 57) CO2 emissions from battery power [kg]: C Output_Bat (t)…(Formula 58) Grid and solar CO2 emissions [kg / kWh]:CO2 in (t) …(Formula 59) Equations 52 to 56 show the variables used in calculating the objective function or constraints.

[0200] Equation 52 expresses the amount of AC power P output from the storage battery 15 and converted by the power conditioner 16 during the target period t. Bat_ac (t) [kWh] is shown.

[0201] Equation 53 expresses the amount of DC power P output from the storage battery 15 during the target period t. Bat_dc (t) [kWh] is shown.

[0202] Figure 6 shows the amount of power P Bat_ac (t) and power consumption P Bat_dc (t) is a graph showing the relationship between the amount of power discharged from the storage battery 15 and the amount of power charged to the storage battery 15. The amount of power P Bat_dc The power of (t) is the charge / discharge efficiency μ and the AC power P Bat_ac It is converted to (t).

[0203] Equation 54 is a variable S that indicates whether the storage battery 15 is in a discharging operation. Bat_dcrg (t) and the variable S Bat_dcrg If (t) is 1, it indicates that the storage battery 15 is in discharging operation, and if it is 0, it indicates that the storage battery 15 is not in discharging operation.

[0204] Equation 55 is a variable S that indicates whether the storage battery 15 is in charging operation. Bat_crg (t) and the variable S Bat_crg If (t) is 1, it indicates that the storage battery 15 is in charging operation, and if it is 0, it indicates that the storage battery 15 is not in charging operation.

[0205] Equation 56 represents the remaining capacity SOC(t) [kWh] of the storage battery 15 during the target period t.

[0206] Equation 57 is the CO2 emissions CO2 during the production of electricity output from the storage battery 15 during the target period t. Bat (t) [kg / kWh].

[0207] Equation 58 is the amount of CO2 emissions C during the production of electricity output from the storage battery 15 during the target period t. Output_Bat (t) [kg] is shown.

[0208] Equation 59 is the CO2 emissions in the production of electricity, which is the sum of the power received from the power grid 2 and the power generated by the solar power generator 3. in (t) [kg / kWh].

[0209] <<Conditions>> P Bat_dc (t)=S Bat_dcrg (t)×(P Bat_ac (t) / μ) +S Bat_crg (t)×(P Bat_ac (t)×μ) …(Equation 60) SOC(t)=SOC(t-1)-P Bat_dc (t-1) …(Equation 61) CO2 in (t)=(CO2 Grid (t-1)×P Grid (t-1) +CO2 Pv (t-1)×P Pv (t-1)) / (P Grid (t-1)+P Pv (t-1)) …(Equation 62) CO2 Bat (t)=S Bat_dcrg (t-1)×CO2 Bat (t-1) +S Bat_crg (t-1)× {(CO2 Bat (t-1)×SOC(t-1) -CO2 in (t-1)×P Bat_dc (t-1)) / SOC(t)} …(Equation 63) C Output_Bat (t) = CO2 Bat (t)×P Bat_ac (t) …(Equation 64) S Bat_dcrg (t)+S Bat_dcrg (t) = 1 ... (Equation 65) SOC(t)>=SOC LL …(Equation 66) SOC(t)<=SOC HL …(Equation 67)

[0210] Equation 60 and Equation 67 are shown in Equation 1. The objective number is maximized and the constraint conditions are shown in Equation 1.

[0211] Equation 60 is the amount of DC power P output from the storage battery 15 during the target period t. Bat_dc (t) is the amount of AC power P during discharge Bat_ac (t) divided by the charge / discharge efficiency μ and the amount of AC power during charging P Bat_ac This indicates that the sum of (t) and the value obtained by multiplying the charge / discharge efficiency μ is obtained.

[0212] Equation 61 shows that the remaining capacity SOC(t) of the storage battery 15 in the target period t is calculated by subtracting the remaining capacity SOC(t-1) of the storage battery 15 in the target period t-1 from the output power P Bat_dc Indicates that the value is the value obtained by subtracting (t-1).

[0213] Equation 62 is the CO2 emissions CO2 in (t) indicates a value obtained by dividing the amount of CO2 emissions during the production of power received from the power grid 2 and power generated by the solar power generator 3 by the total of the received power and the generated power.

[0214] Equation 63 is the CO2 emissions CO2 of the charging power of the storage battery 15 during the target period t. Bat (t) indicates the sum of the amount of CO2 emitted in producing the output of the storage battery 15 during discharge and the amount of CO2 emitted in producing the output of the storage battery 15 during charge.

[0215] Equation 64 is the amount of CO2 emissions C during the production of electricity output from the storage battery 15 during the target period t. Output_Bat (t) is CO2 emissionsCO2 Bat (t) and the output power of the storage battery 15 P Bat_ac Show that it is a product of (t).

[0216] Equation 65 indicates that the storage battery 15 performs a discharging operation or a charging operation during the target period t.

[0217] Equation 66 shows that the remaining battery capacity SOC(t) of the storage battery 15 during the target period t is the lower limit SOC LL Indicates that this is the case.

[0218] Equation 67 shows that the remaining battery capacity SOC(t) of the storage battery 15 during the target period t is the upper limit SOC HL Show that:

[0219] FIG. 7 is a diagram showing an example of a screen display by the display control unit 29 according to the second embodiment of the present disclosure.

[0220] The display screen shown in Fig. 7 is the same as the display screen according to the first embodiment shown in Fig. 3. However, information about the storage battery 15 is added.

[0221] That is, it is shown that the power charged from the solar power generator 3 to the storage battery 15 is R [kW]. When power is discharged from the storage battery 15, the arrow points in the opposite direction and the discharged power is displayed.

[0222] It also shows that the amount of CO2 emissions in producing the electricity charged in the storage battery 15 is zzz [kg / kWh].

[0223] [Processing flow of the control device 13] FIG. 8 is a flowchart showing an example of a processing procedure of the control device 13 according to the second embodiment of the present disclosure.

[0224] The target value acquisition unit 24 acquires the target value of CO2 emissions (CO2 Base , CO2 Rate ) is read from the storage unit 23 (S1).

[0225] The emission acquisition unit 25 acquires the CO2 emissions CO2 Grid (t) is read from the storage unit 23 (S2).

[0226] The emission acquisition unit 25 acquires the CO2 emissions CO2 Pv (t) is read from the storage unit 23 (S3).

[0227] The emission amount acquisition unit 25 calculates the CO2 emission amount CO2 in the production of the electricity to be charged to the storage battery 15 according to Equation 63. Bat(t) is calculated (S11).

[0228] The generated power amount acquisition unit 26 acquires the generated power amount P Pv (t) is read from the storage unit 23 (S4).

[0229] The determination unit 27 determines the value of each variable by maximizing the objective function shown in Equation 1 under the constraint conditions shown in Equations 14 to 17 and the constraint conditions shown in Equations 60 to 67 (S12).

[0230] The command transmitting unit 28 generates a switching instruction signal for the changeover switch 4, an opening / closing instruction signal for the valve 6, and an opening / closing instruction signal for the valve 7 for each target period t based on the determined grid interconnection mode Mode(t). The command transmitting unit 28 transmits the generated switching instruction signals to the changeover switch 4. Furthermore, the command transmitting unit 28 transmits the generated opening / closing instruction signal for the valve 6 to the control device of the valve 6, and transmits the generated opening / closing instruction signal for the valve 7 to the control device of the valve 7 (S6).

[0231] The command transmission unit 28 receives the amount of power P Grid Based on (t), the input power amount P WE (t) is determined, and the input power amount P WE A command including (t) is transmitted (S6).

[0232] [Effects of the Second Embodiment] As described above, the output power from the solar power generator 3 or the storage battery 15 is used as the power generated by the solar power generator 3 to control the hydrogen production system 1. Therefore, even in a configuration including the storage battery 15, efficient hydrogen production is possible while controlling the amount of carbon dioxide emissions during hydrogen production.

[0233] <Embodiment 3> In the first embodiment, the hydrogen production system 1 is controlled by optimizing an objective function under predetermined constraints. In the present disclosure, a configuration for controlling the hydrogen production system 1 so as to satisfy a preset target operation rate will be described.

[0234] The configuration of the hydrogen production system 1 according to the third embodiment is the same as that of the first embodiment, and therefore, detailed description thereof will not be repeated.

[0235] The generated power amount acquiring unit 26 of the control device 13 acquires the power generation time and the amount of power generated by the solar power generator 3. Specifically, the generated power amount acquiring unit 26 acquires the generated power amount P Pv (t) [kWh] is read from the memory unit 23.

[0236] The determination unit 27 of the power generation amount acquisition unit 26 determines the target availability rate of the hydrogen production device 5 and the power generation amount P of the solar power generator 3 for each target period t acquired by the power generation amount acquisition unit 26. Pv Based on (t) [kWh], the receiving time of the power from the power grid 2 is determined. The target availability of the hydrogen production device 5 is stored in advance in the memory unit 23, and the determination unit 27 reads out information on the target availability from the memory unit 23.

[0237] 9 is a diagram illustrating an example of control of the hydrogen production system 1 by the control device 13 according to the third embodiment of the present disclosure. The horizontal axis represents time, and the vertical axis represents power. FIG. 9 shows the transition of power over 24 hours from midnight to midnight.

[0238] For example, 24 hours are divided into either a grid time zone Tg or a renewable energy time zone Tr. For example, the time zone for late-night electricity rates is designated as the grid time zone Tg, and the other time zones are designated as the renewable energy time zone Tr. Since the renewable energy time zone Tr is a daytime zone, the solar power generator 3 can generate a lot of power.

[0239] The solid line indicates the power generation 81 of the solar power generator 3 during the renewable energy time zone Tr. The hatched area indicates the input power 82 of the hydrogen production device 5 during the renewable energy time zone Tr, and the hatched area indicates the input power 83 of the hydrogen production device 5 during the grid time zone Tg.

[0240] Here, the following formula 68 shows the total input power amount of the hydrogen production device 5 when the hydrogen production device 5 is operated at the rated input power amount for 24 hours.

[0241] The following formula 69 shows the total input power amount of the hydrogen production device 5 in the renewable energy time zone Tr. The following formula 70 shows the total input power amount of the hydrogen production device 5 in the grid time zone Tg.

[0242] The following formula 71 shows a conditional formula for determining the amount of input power to the hydrogen production device 5 during the system time period Tg. Here, η in formula 71 represents the target operation rate of the hydrogen production device 5. Formula 71 expresses the condition that the total input power amount to the hydrogen production device 5 over 24 hours is P max ×η, the input power amount P of the hydrogen production device 5 in each target period t included in the system time zone Tg is calculated. WE In other words, according to Equation 71, the total input power (P tr +P tg ) is P max ×η, the input power amount P of the hydrogen production device 5 in each target period t included in the grid time zone Tg WE (t) is the rated input power P WE_rate In addition, the total input power amount (P tr +P tg ) is P max ×η or more, the input power P of the hydrogen production device 5 in each target period t included in the system time zone Tg WE (t) is set to 0.

[0243] The determination unit 27 determines the input power amount P of the hydrogen production device 5 in each target period t included in the grid time period Tg according to Equation 71. WE The determining unit 27 determines the amount of input power P WE (t) is the amount of received power P during each target period t included in the grid time period Tg. Grid (t) is determined. P max =P WE_rate ×24…(Formula 68) P tr=ΣP WE (t) [t∈Tr] …(Equation 69) P tg =ΣP WE (t) [t∈Tg] …(Equation 70) If(P max ×η>P tr +P tg ) P WE (t)=P WE_rate [t∈Tg] Else P WE (t)=0[t∈Tg] …(Equation 71)

[0244] According to the third embodiment, the power receiving time can be determined so as to achieve the target availability η of the hydrogen production device 5. This enables efficient hydrogen production.

[0245] <Variation 5> In the third embodiment, the hydrogen production system 1 is controlled so as to satisfy the target operation rate, but the hydrogen production system 1 may be controlled so that the total CO 2 emissions are equal to or less than a target value.

[0246] Specifically, the determination unit 27 determines the input power amount P WE (t) may be determined.

[0247] <Embodiment 4> In the second embodiment, the hydrogen production system 1 is controlled by optimizing an objective function under predetermined constraints. In the present disclosure, a configuration for controlling the hydrogen production system 1 so as to satisfy a preset target operation rate will be described.

[0248] The configuration of the hydrogen production system 1 according to the fourth embodiment is the same as that of the fourth embodiment, and therefore, detailed description thereof will not be repeated.

[0249] The generated power amount acquiring unit 26 of the control device 13 acquires the power generation time and the amount of power generated by the solar power generator 3. Specifically, the generated power amount acquiring unit 26 acquires the generated power amount P Pv (t) [kWh] is read from the memory unit 23.

[0250] The determination unit 27 of the power generation amount acquisition unit 26 determines the target availability rate of the hydrogen production device 5 and the power generation amount P of the solar power generator 3 for each target period t acquired by the power generation amount acquisition unit 26. Pv Based on (t) [kWh], the receiving time of the power from the power grid 2 is determined. The target availability of the hydrogen production device 5 is stored in advance in the memory unit 23, and the determination unit 27 reads out information on the target availability from the memory unit 23.

[0251] 10 is a diagram illustrating an example of control of the hydrogen production system 1 by the control device 13 according to the fourth embodiment of the present disclosure. The horizontal axis represents time, and the vertical axis represents power. Fig. 10 shows the transition of power over 24 hours from midnight to midnight.

[0252] For example, 24 hours are divided into either a grid time zone Tg or a renewable energy time zone Tr. For example, the time zone for late-night electricity rates is designated as the grid time zone Tg, and the other time zones are designated as the renewable energy time zone Tr. Since the renewable energy time zone Tr is a daytime zone, the solar power generator 3 can generate a lot of power.

[0253] The solid line indicates the power generation 81 of the solar power generator 3 during the renewable energy time zone Tr. The hatched area indicates the input power 82 of the hydrogen production device 5 during the renewable energy time zone Tr, and the hatched area indicates the input power 83 of the hydrogen production device 5 during the grid time zone Tg.

[0254] The rated input power P of the hydrogen production device 5 WE_rate The power generated by the solar power generator 3 exceeds the rated input power P WE_rateThe storage battery 15 is discharged in less than 100 volts.

[0255] As in the third embodiment, the determination unit 27 determines the input power amount P of the hydrogen production device 5 in each target period t included in the grid time zone Tg according to Equation 71. WE The determining unit 27 determines the amount of input power P WE (t) is the amount of received power P during each target period t included in the grid time period Tg. Grid (t) is determined.

[0256] According to the fourth embodiment, the power receiving time can be determined so as to achieve the target availability η of the hydrogen production device 5. This enables efficient hydrogen production.

[0257] [Note] Some or all of the components constituting the control device 13 may be configured from one or more semiconductor devices such as system LSIs.

[0258] The computer program may be distributed by recording it on a computer-readable non-transitory recording medium, such as a hard disk drive (HDD), a CD-ROM, a semiconductor memory, etc. The computer program may also be distributed by transmitting it via a telecommunications line, a wireless or wired communication line, a network such as the Internet, data broadcasting, etc.

[0259] Furthermore, the control device 13 may be realized by a plurality of computers or a plurality of processors.

[0260] Furthermore, some or all of the functions of the control device 13 may be provided by cloud computing. That is, some or all of the functions of the control device 13 may be realized by a cloud server.

[0261] Furthermore, at least some of the above-described embodiments and modifications may be combined in any manner.

[0262] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0263] 1. Hydrogen production system 2 Power system 3. Solar power generator 4. Changeover switch 5. Hydrogen production equipment 6 valves 7 Valves 8-system hydrogen tank (second storage device) 9 Renewable hydrogen tank (first storage device) 10 Valve (mixing device) 11 Valve (mixing device) 12 Mixed hydrogen tank 13 Control device 14 Display device 15 Storage battery 16 Power conditioner 21 Control section 22 Communications Department 23 Memory section 24 Target value acquisition section 25 Emissions Acquisition Department 26 Power generation amount acquisition unit 27 Decision Section 28 Command transmission unit 29 Display control unit 30 Bus 44 External I / F device 71 graphs 72 graphs 81 Power generation 82 Input power 83 Input power

Claims

1. a hydrogen production device that produces hydrogen by consuming one of electric power generated by a generator using renewable energy and electric power received from a power grid, the one being selected on an hourly basis; a control device that selects one of the generated power and the received power on an hourly basis as input power to the hydrogen production device; The control device includes: a power generation amount acquiring unit for acquiring a power generation time and a power generation amount by the generator; a determination unit that determines a power receiving time of the received electric power based on a target availability rate of the hydrogen production device and a power generation time and an amount of power generated by the generator.

2. A first storage device that consumes the generated power and stores first hydrogen produced by the hydrogen production device; The hydrogen production system according to claim 1 , further comprising a second storage device that consumes the received power and stores second hydrogen produced by the hydrogen production device.

3. The hydrogen production system according to claim 2 , further comprising a mixer that mixes the first hydrogen stored in the first storage device and the second hydrogen stored in the second storage device.

4. The control device includes:

4. The hydrogen production system according to claim 2, further comprising a display control unit that displays on a screen the amount of the first hydrogen stored in the first storage device and the amount of carbon dioxide emission for producing the first hydrogen, and the amount of the second hydrogen stored in the second storage device and the amount of carbon dioxide emission for producing the second hydrogen.

5. The hydrogen production system according to claim 4 , wherein the display control unit further causes the generated power and the received power input to the hydrogen production device to be displayed on the screen.

6. The hydrogen production system according to claim 5 , wherein the display control unit further causes the screen to display amounts of carbon dioxide emission in the production of the generated power and the received power.

7. Further comprising a storage battery for charging the generated power, The hydrogen production system according to claim 1 , wherein the output power from the generator or the storage battery is used as the generated power by the generator.

8. The control device controls the mixing ratio of the first hydrogen and the second hydrogen by the mixing device based on a target value of carbon dioxide emission during hydrogen production. The hydrogen production system according to claim 3 .

9. A control device for controlling a hydrogen production device that produces hydrogen by consuming one of electric power generated by a generator using renewable energy and electric power received from a power grid, the control device comprising: the control device selects one of the generated power and the received power as input power to the hydrogen production device on an hourly basis; The control device includes: a power generation amount acquiring unit for acquiring a power generation time and a power generation amount by the generator; a determination unit that determines a power receiving time of the received electric power based on a target availability rate of the hydrogen production device and a power generation time and an amount of power generated by the generator.

10. A step in which a control device acquires a power generation time and a power generation amount by a generator using renewable energy; The control device determines a time period for receiving power from a power grid based on a target availability rate of the hydrogen production device and a power generation time and amount of power generated by the generator; and producing hydrogen by the hydrogen production device consuming one of the electric power generated by the generator and the received electric power, the one being selected on an hourly basis.

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