JP2020058168A - Hydrogen supply system and hydrogen supply method - Google Patents

Abstract

To provide a hydrogen supply system and a hydrogen supply method, capable of efficiently producing and supplying hydrogen by generated power of renewable energy.SOLUTION: A hydrogen supply system 1 includes: solar power generation devices 12-1 to 12-n for generating power by power generation using renewable energy; water electrolysis devices 13-1 to 13-n for generating hydrogen by electrolysis of water using at least one of generated power supplied from the solar power generation devices 12-1 to 12-n and generated power transmitted from the solar power generation devices 12-1 to 12-n to a distribution line 11; and a humidity controller 14 for adjusting an amount of water contained in the hydrogen to a desired range and supplying it to a hydrogen utilizing facility 16.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a hydrogen supply system and a hydrogen supply method, for example, to a hydrogen supply system and a hydrogen supply method for supplying hydrogen using renewable energy power generation.

  2. Description of the Related Art In recent years, introduction and dissemination of power generation equipment and the like using renewable energy such as wind power and solar light have been promoted in order to reduce energy carbon. As a power generation facility using renewable energy, a renewable energy power generation system including a wind power generator that generates power by wind power as renewable energy has been proposed (for example, see Patent Document 1). In the renewable energy power generation system described in Patent Literature 1, AC power generated by a wind power generator is converted into DC power by a power converter and stored in a power storage device. If necessary, the DC power is discharged from the power storage device, converted into AC power by the power converter, and supplied to the power system, so that the power generated by the wind power generator can be effectively used.

JP 2017-93051 A

  By the way, the output of renewable energy power generation greatly fluctuates due to climate, weather, and the like, and it is necessary to stabilize the power output in order to expand the introduction of renewable energy power generation. Also, recently, new connections to transmission lines and distribution lines of new power plants have been severe, and even existing power plants have been limited in power generation output. For this reason, the expansion of the introduction of renewable energy with unstable power generation output requires the stabilization of the transmission system and distribution system. . However, power stabilization using a storage battery is not only expensive and has limitations on the storage capacity of generated power, but also causes power loss during charging and discharging.

  In addition, from the viewpoint of energy reduction, carbon, which is only exhaust gas or water vapor at the time of utilization, has attracted attention as an alternative energy to fossil fuel. At present, hydrogen is produced by steam reforming of fossil fuels, but it does not necessarily contribute to low carbonization because carbon dioxide is emitted during production. In addition, hydrogen may be produced by electrolysis of water using renewable energy, but the power generated by renewable energy fluctuates. For this reason, when the fluctuated generated power is supplied to the electrolyzer, an excessive mechanical load may be applied to the electrolyzer such as deterioration of the electrodes. As described above, in the related art, it has been difficult to efficiently produce hydrogen using generated power of renewable energy, and to store and use the produced hydrogen.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hydrogen supply system and a hydrogen supply method capable of efficiently producing and supplying hydrogen with generated power of renewable energy.

  The hydrogen supply system according to the present invention includes: at least one renewable energy power generation device that generates power generation by power generation using renewable energy; the power generation power supplied from the at least one renewable energy power generation device; At least one water electrolysis device that generates hydrogen by electrolysis of water using at least one of the generated power transmitted from one renewable energy power generation device to a distribution line; and And a humidity control device that adjusts to a range and supplies it to the hydrogen utilization facility.

  According to the hydrogen supply system, since the water electrolysis device is provided corresponding to the photovoltaic power generation device, even if the power generated by the power generation output fluctuates greatly, such as renewable energy such as sunlight, the water electrolysis device is used. Thus, hydrogen can be efficiently converted and used. Thus, even when a solar power generation device having a power generation output equal to or larger than the transmission capacity that can be interconnected is provided, it is possible to secure stable transmission power based on a prediction in advance. As a result, it is possible to greatly increase the generated power using renewable energy without strengthening the power grid, and to supply power to the water electrolyzer very efficiently without using transmission lines. It is possible to expand use with less waste. From this point of view, from the viewpoint of the power system, by absorbing the generated power that fluctuates in the water electrolyzer, even if the power generation rate of the power system is low, the connection frame can be established at the rated output. It is also possible to eliminate the occupied interconnection connection capacity. Furthermore, by providing the water electrolysis device, it becomes possible to cut the peak of the power generation output of the photovoltaic power generation device in which the power generation output fluctuates depending on the amount of solar radiation, temperature, and the like. Stable power can be supplied. In addition, the hydrogen obtained by the water splitter is adjusted to a desired water content and can be used as hydrogen as a fuel for boilers and fuel cells, hydrogen used in manufacturing and processing equipment, and hydrogen for fuel cell vehicles and the like. This will enable the construction of a hydrogen fuel supply chain that enables the non-fossilization of fossil fuels that have been used up to now, centering on these various industries and the transportation sector, and more directly addressing global warming countermeasures. Promotion becomes possible. Therefore, it is possible to realize a hydrogen supply system capable of efficiently producing and supplying hydrogen with the generated power of renewable energy.

  In the hydrogen supply system, the water electrolyzer is preferably a solid polymer membrane water electrolyzer. With this configuration, since the solid polymer membrane water electrolysis device is provided corresponding to the solar power generation device, the water electrolysis device can be used even for power whose power generation output fluctuates greatly, such as renewable energy such as sunlight. Thus, hydrogen can be more efficiently converted and used.

  In the hydrogen supply system, it is preferable that the renewable energy power generation device is a solar power generation device. With this configuration, it is possible to efficiently produce and supply hydrogen using sunlight as renewable energy.

  In the hydrogen supply system, it is preferable to control a transmission output of the generated power transmitted from the renewable energy power generation device to a transmission line so as not to exceed a preset upper limit value. With this configuration, even when a high-output renewable energy power generation device is connected to a transmission line with a small transmission capacity, the power generation output of the renewable energy power generation device is used as transmission power and water electrolysis supply power by water electrolysis. It can be used effectively.

  In the hydrogen supply system, it is preferable to control a transmission output of the generated power transmitted from the renewable energy power generation device to a transmission line so as not to exceed a preset output change rate. With this configuration, even when there is a large change in the amount of sunlight and a large change in the system voltage of the power system of the distribution line and the transmission line, the change in the system voltage can be reduced. In addition, it is possible to reduce the load of a power supply / demand adjustment measure.

  In the hydrogen supply system, the water electrolyzer may control a transmission output of the generated power transmitted from the renewable energy power generator to the distribution line based on a preset planned power generation amount. preferable. With this configuration, the accuracy of the power supply and demand plan can be improved, and the load of the operation adjustment measure can be reduced.

  The hydrogen supply method according to the present invention includes a step of obtaining power generated by power generation using renewable energy by at least one renewable energy power generator, and the at least one renewable energy power generator by at least one water electrolysis apparatus. Obtaining hydrogen by electrolysis of water using at least one of the generated power supplied from the at least one of the generated power and the generated power transmitted from the at least one renewable energy power generation device to a distribution line; and moisture contained in the hydrogen. Adjusting the amount to a desired range and supplying the adjusted amount to a hydrogen utilization facility.

  According to the above hydrogen supply method, since the water is electrolyzed by the water electrolyzer to generate hydrogen using the power generated from the photovoltaic power generator, the power output can be reduced as in the case of renewable energy such as sunlight. Even if the power fluctuates greatly, it can be efficiently converted to hydrogen and used by the water electrolysis device. Thus, even when a solar power generation device having a power generation output equal to or larger than the transmission capacity that can be interconnected is provided, it is possible to secure stable transmission power based on a prediction in advance. As a result, it is possible to greatly increase the generated power using renewable energy without strengthening the power grid, and to supply power to the water electrolyzer very efficiently without using transmission lines. It is possible to expand use with less waste. From this point of view, from the viewpoint of the power system, by absorbing the generated power that fluctuates in the water electrolyzer, even if the power generation rate of the power system is low, the connection frame can be established at the rated output. It is also possible to eliminate the occupied interconnection connection capacity. In addition, the water electrolysis device enables the power generation output to fluctuate depending on the amount of solar radiation and temperature, etc. can do. In addition, the hydrogen obtained by the water splitter is adjusted to a desired water content and can be used as hydrogen as a fuel for boilers and fuel cells, hydrogen used in manufacturing and processing equipment, and hydrogen for fuel cell vehicles and the like. This will enable the construction of a hydrogen fuel supply chain that enables the non-fossilization of fossil fuels that have been used up to now, centering on these various industries and the transportation sector, and more directly addressing global warming countermeasures. Promotion becomes possible. Therefore, it is possible to realize a hydrogen supply method capable of efficiently producing and supplying hydrogen using the generated power of renewable energy.

  According to the present invention, it is possible to realize a hydrogen supply system and a hydrogen supply method capable of efficiently producing and supplying hydrogen using generated power of renewable energy.

FIG. 1A is a schematic diagram of a hydrogen supply system according to an embodiment of the present invention. FIG. 1B is a diagram schematically showing a conventional hydrogen supply system. FIG. 2 is a conceptual diagram of hydrogen utilization in the hydrogen supply system according to the embodiment of the present invention. FIG. 3 is a diagram illustrating an example of the hydrogen utilization facility according to the embodiment of the present invention. FIG. 4 is a diagram illustrating an example of operation control of the hydrogen supply system according to the embodiment of the present invention. FIG. 5 is a diagram illustrating another example of operation control of the hydrogen supply system according to the embodiment of the present invention. FIG. 6 is a diagram illustrating another example of the operation control of the hydrogen supply system according to the embodiment of the present invention. FIG. 7 is a diagram illustrating a relationship between a time zone and a sunshine time in the photovoltaic power generator according to the embodiment of the present invention.

  In recent years, renewable energy power generation using renewable energy such as sunlight and wind power has been spotlighted. A photovoltaic power generation device using sunlight as renewable energy is generally connected to a distribution line in a region where the photovoltaic power generation device is installed. According to such a photovoltaic power generation device, the amount of renewable energy introduced can be increased without strengthening the power grid in each region, which leads to an improvement in the energy self-sufficiency rate.

Also, half of fuels, which account for 75% of domestic energy consumption, are used in various industrial fields for business and industrial use. Fuel used in such various industrial fields are difficult non fossilized, for low carbonization of energy conversion to CO ₂ free hydrogen is effective.

  In view of the above, the present inventors have conceived of supplying hydrogen using electric power obtained by solar power generation, which is renewable energy power generation. And the present inventors not only convert the electric power obtained by solar power generation to hydrogen and save it, but also supply the obtained hydrogen by adjusting the water content according to the application. The inventors have found that the above problems can be solved, and have completed the present invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and can be implemented with appropriate modifications.

  First, an outline of the hydrogen supply system according to the present embodiment will be described. FIG. 1A is a schematic diagram of a hydrogen supply system according to the present embodiment. As shown in FIG. 1A, a hydrogen supply system 1 according to the present embodiment electrolyzes water by a water electrolysis device 13 using power generated by solar power generation devices 12-1 to 12-n. Then, hydrogen is generated, and the amount of water in the generated hydrogen is adjusted by the humidity control device 14 and supplied.

  The hydrogen supply system 1 according to the present embodiment includes a plurality of solar power generation devices 12-1 to 12-n (renewable energy power generation devices) connected to a distribution line 11, a distribution line 11 and a solar power generation device 12 Included in the hydrogen produced by the plurality of water electrolyzers 13-1 to 13-n and the plurality of water electrolyzers 13-1 to 13-n respectively provided between -1 to 12-n. A humidity control device 14 for controlling the humidity of hydrogen. In the present embodiment, an example in which the renewable energy power generation devices are the solar power generation devices 12-1 to 12-n will be described. As the renewable energy power generation device, for example, a wind power generation device, a geothermal power generation device Various power generation devices such as a device, a hydraulic power generation device, a solar thermal power generation device, a geothermal power generation device, a wave power generation device, a tidal power generation device, a biomass power generation device, and a combination thereof can be applied.

  The distribution line 11 is connected to a transmission line 15. The distribution line 11 supplies the power generated by the photovoltaic power generators 12-1 to 12-n to the transmission line 15. The transmission line 15 supplies the electricity transmitted to a predetermined substation via the distribution line 11 to various consumers. The distribution line 11 may be an “overhead distribution line” in which a power pole is wired with an electric wire, or may be a “underground distribution line” in which an electric wire is buried underground.

  Each of the solar power generation devices 12-1 to 12-n includes at least one solar cell. The solar cell may be a solar cell panel, a solar cell film, or a combination of various solar cells such as a solar cell panel and a solar cell film. The photovoltaic power generators 12-1 to 12-n generate photovoltaics (PV: Photovoltaics) using sunlight received by the solar cells. The photovoltaic power generators 12-1 to 12-n convert the generated power generated by the respective photovoltaic cells into the water electrolyzers 13-1 to 13-13 provided for each of the photovoltaic power generators 12-1 to 12-n. -N. Note that, in the present embodiment, an example in which the hydrogen supply system 1 includes a plurality of solar power generation devices 12-1 to 12-n will be described, but it is sufficient that at least one solar power generation device is provided.

  The water electrolyzers 13-1 to 13-n electrolyze water with power generated from the solar power generators 12-1 to 12-n to produce hydrogen gas and oxygen gas. The water electrolyzers 13-1 to 13-n supply the produced hydrogen to the humidity controller 14. As the water electrolyzers 13-1 to 13-n, for example, various electrolyzers for electrolyzing water such as an alkaline water electrolyzer and a solid polymer membrane water electrolyzer (PEM: Polymer Electrolyte Membrane) are used. It is possible. In the present embodiment, an example has been described in which the plurality of water electrolysis devices 13-1 to 13-n are provided between the plurality of solar power generation devices 12-1 to 12-n and the transmission line 15, respectively. However, the hydroelectric devices 13-1 to 13-n do not necessarily need to be provided between all the solar power generation devices 12-1 to 12-n and the transmission line 15. The water electrolyzers 13-1 to 13-n are disposed between the transmission line 15 and each of the solar power generation units 12-12-n according to the amount of solar radiation of each of the solar power generation units 12-1 to 12-n, the temperature, and the like. It is sufficient if at least one is provided. In this case, the water electrolysis devices 13-1 to 13-n may be provided to the respective solar power generation devices 12-1 to 12-n via the distribution line 11, and the respective solar power generation devices 12-1 to 12-n may be provided. -1 to 12-n may be provided without passing through the distribution line 11. When the water electrolyzers 13-1 to 13-n are provided to the respective solar power generators 12-1 to 12-n via the distribution line 11, each of the solar power generators 12-1 to 12-n is provided. Water electrolysis is performed using the generated power transmitted to the distribution line 11 from .about.12-n. In addition, when the water electrolysis devices 13-1 to 13-n are provided to the respective photovoltaic power generation devices 12-1 to 12-n without passing through the distribution line 11, the respective photovoltaic power generation devices 13-1 to 13-n are provided. Water electrolysis is performed using the generated power supplied directly or indirectly from each of the solar power generation devices 12-1 to 12-n without passing through the distribution line 11 from 12-1 to 12-n. .

  In the present embodiment, it is preferable to use a solid polymer membrane water electrolyzer as the water electrolyzers 13-1 to 13-n from the viewpoint of effectively using renewable energy such as sunlight. According to the solid polymer membrane water electrolyzer, not only the overload operation can be performed, but also the alkali water electrolyzer is more resistant to pressure fluctuation of the hydrogen supply pressure and can cope with the operation at a low load. . In addition, according to the solid polymer membrane water electrolysis apparatus, high-quality hydrogen that has high load followability and can be used for various purposes can be obtained. Further, the solid polymer membrane water electrolyzer can have a unit structure composed of a rectifier device, a stack, a gas treatment device, and the like, and can output 1.5 MW that can be accommodated in a transportation container such as a freight train and a truck. It is also possible to use a solid polymer membrane water electrolysis device. In addition, the solid polymer membrane water electrolyzer has a faster response speed to an input request required to cope with a sudden change in the power generation output due to renewable energy than a general storage battery and an alkaline water electrolyzer. Since the hydrogen generation efficiency is high, a large-scale facility can cope with mega-solar-class solar power generation devices 12-1 to 12-n in spite of the unit structure. Furthermore, the solid polymer membrane water electrolyzer not only has a response range of the input power to the current density that is about five times that of the alkaline water electrolyzer, but also has an instantaneous overload of the power input of renewable energy power generation. Also highly adaptable to In addition, the solid polymer membrane water electrolyzer has an extremely high hydrogen generation efficiency, and the high quality of the generated hydrogen eliminates the need for gas treatment equipment. It can be configured with a device size of about 1, and can be significantly reduced in size. Further, the power generated by the photovoltaic power generators 12-1 to 12-n tends to change abruptly, and a solid polymer membrane water electrolyzer is preferable in order to cope with such a sudden change in the power generated.

  Each of the water electrolysis devices 13-1 to 13-n includes an energy management system (EMS). The energy management system adjusts the supply power of the generated power from the solar power generation devices 12-1 to 12-n to the water electrolysis device main body, and does not apply an excessive load to the water electrolysis devices 13-1 to 13-n. Control. In addition, the energy management system uses the generated power of the unstable portion that increases or decreases due to the amount of solar radiation or the like for water electrolysis, and the generated power of the stable portion without power fluctuations via the distribution line 11 and the transmission line 15. Transmit to grid power. As a result, only the stable part of the generated power obtained by photovoltaic power generation can be transmitted to the power system, not only contributing to power stabilization but also expanding the introduction of renewable energies, thereby reducing energy use. Can also be realized.

  The humidity control device 14 adjusts the amount of water contained in the hydrogen supplied from the water electrolysis devices 13-1 to 13-n to a desired range to control the humidity. The humidity control device 14 supplies the conditioned hydrogen to the hydrogen utilization facility 16. The humidity control device 14 performs, for example, a humidifying operation by bringing hydrogen and water into contact with each other, and also makes contact with the adsorbent of hydrogen and moisture, or contact between hydrogen and a cooling member such as a cooling coil and moisture into the dehumidifying tower. By performing the adsorption, the humidity is controlled by performing a dehumidification operation for lowering the temperature of hydrogen.

  Next, an outline of a conventional hydrogen supply system will be described. FIG. 1B is a diagram schematically showing a conventional hydrogen supply system. As shown in FIG. 1B, a conventional hydrogen supply system 100 transmits power generated by a plurality of solar power generation devices 102-1 to 102-n connected to a distribution line 101 to a transmission line via the distribution line 101. The generated power is transmitted to 103. The generated power of the solar power generation devices 102-1 to 102-n transmitted to the transmission line 103 is supplied to the alkaline water electrolysis device 104 connected to the transmission line 103. Then, the hydrogen generated in the alkaline water electrolyzer 104 is supplied to the hydrogen utilization facility 105.

  As described above, in the conventional hydrogen supply system 100, since the water electrolysis device using the power generated by the solar power generation devices 102-1 to 102-n is not provided on the distribution line 101 side, the distribution line 101 is not provided. No extra power is generated on the wire 101 side. As a result, the power generated by the photovoltaic power generators 102-1 to 102-n may be limited according to the power usage status of the power transmission line 103 and the power generation status of the photovoltaic power generators 102-1 to 102-n. . On the other hand, according to the hydrogen supply system 1 shown in FIG. 1A, since the water electrolyzers 13-1 to 13-n are connected to the distribution line 11, the power state of the distribution line 11 is reduced. There is room. Thereby, the output of the solar power generation devices 12-1 to 12-n can always be maximized and surplus power can be supplied to the water electrolysis devices 13-1 to 13-n. 12-1 to 12-n can be operated efficiently.

  Further, in the conventional hydrogen supply system 100 shown in FIG. 1B, since the alkaline water electrolysis apparatus 104 is used, the water electrolysis is efficiently performed as in the hydrogen supply system 1 according to the above-described embodiment. I can't do it. Further, in the alkaline water electrolysis apparatus 104, since hydrogen after electrolysis of water contains an alkali component, a problem based on the alkali component may occur depending on the hydrogen utilization equipment 105. Further, in the conventional hydrogen supply system 100, the moisture in the hydrogen generated by the alkaline water electrolysis device 104 cannot be humidified, so that hydrogen suitable for various uses of the hydrogen utilization equipment 105 cannot be supplied. On the other hand, in the hydrogen supply system 1 according to the present embodiment shown in FIG. 1A, for example, a solid polymer membrane water electrolyzer is used as the water electrolyzers 13-1 to 13-n. In addition, the hydrogen generated by the electrolysis of water does not include an alkali component, and the above-described problem in the hydrogen utilization facility 105 can be avoided. The hydrogen supply system 1 shown in FIG. 1A adjusts the humidity of the hydrogen generated in the water electrolyzers 13-1 to 13-n by the humidity control device. Since there is no component content, it is possible to supply hydrogen having an optimum humidity according to the use of the hydrogen utilization equipment 16.

FIG. 2 is a conceptual diagram of hydrogen utilization in the hydrogen supply system 1 according to the present embodiment. As shown in FIG. 2, hydrogen gas (H ₂ ) supplied from the hydrogen supply system 1 according to the present embodiment is converted into a low-pressure gas 21 and a high-pressure gas 22 by a pressure adjusting device provided in the humidity control device 14 or the like. The pressure is adjusted, and the pressure is supplied to the hydrogen utilization equipment 16 such as the LP gas supply area A1 and the city gas supply area A2 in the desired city. The low-pressure gas 21 is supplied into the LP gas supply area A1 via a hydrogen gas pipeline provided between the LP gas supply area A1 and a specific hydrogen utilization facility 16, for example. Is supplied to the city gas supply area A2 via the. Further, the high-pressure gas 22 is supplied to the hydrogen utilization facility 16 in the LP gas supply area A1 by a hydrogen transport facility such as a semi-trailer loader, a hydrogen cylinder and a hydrogen storage device such as a hydrogen curl. Thereby, the hydrogen produced by the hydrogen supply system 1 can be efficiently supplied according to the use of the hydrogen utilization facility 16 and the location using the existing pipeline or hydrogen transportation facility. In addition, as a desired city here, for example, a nearby city where the photovoltaic power generators 12-1 to 12-n are present or the like is cited. The hydrogen storage device does not necessarily need to store hydrogen gas, but may store hydrogen gas in a hydrogen storage alloy or the like.

  FIG. 3 is a diagram illustrating an example of the hydrogen utilization facility 16 according to the present embodiment. As shown in FIG. 3, as the hydrogen utilization equipment 16 according to the present embodiment, for example, a hydrogen boiler 31 using hydrogen fuel, a fuel cell 32 that generates power using hydrogen fuel, and a manufacturing process using hydrogen gas are used. And a transportation device 34 such as a fuel cell vehicle and a hydrogen gas vehicle that run using hydrogen fuel. Here, in the hydrogen supply system 1 according to the present embodiment, the hydrogen gas whose moisture content and pressure in the hydrogen gas have been adjusted can be supplied by the humidity control device 14, so that the quality of the hydrogen supply device 1 according to the various hydrogen utilization devices 16 can be improved. Hydrogen can be supplied.

  For example, hydrogen whose moisture content is adjusted to be within a predetermined value (for example, within 5 ppm) by the humidity control device 14 is adjusted to a desired range and the low pressure gas 21 and the high pressure gas 22 shown in FIG. Can be supplied to all of the hydrogen utilization devices 16. The hydrogen whose humidity has been adjusted to a predetermined value or more (for example, 5 ppm or more and a predetermined value or less) by the humidity control device 14 is not used for, for example, a fuel cell vehicle 34 requiring a high hydrogen purity. The low-pressure gas 21 and the high-pressure gas 22 may be supplied to another hydrogen utilization device 16 such as the hydrogen boiler 31, the fuel cell 32, and the manufacturing / processing device 33. Further, in this case, the pressure may not be adjusted by the humidity control device 14, and the low-pressure gas 21 may be supplied to the other hydrogen utilization device 16 via the city gas pipeline or the hydrogen gas pipeline. As described above, the hydrogen supply system 1 according to the present embodiment can arbitrarily adjust the quality of hydrogen by the humidity control device 14 and supply hydrogen of any grade according to the hydrogen utilization device 16 to be supplied with hydrogen. Therefore, high-purity hydrogen can be supplied to the fuel cell vehicle 34 and the like. In addition, the hydrogen boiler 31, the fuel cell 32, and the manufacturing and processing apparatus 33, which do not necessarily require high-purity hydrogen, can be supplied with a reduced amount of hydrogen such as humidity control. Can also be supplied with hydrogen.

  Next, operation control of the hydrogen supply system 1 according to the present embodiment will be described. FIG. 4 is a diagram illustrating an example of operation control of the hydrogen supply system 1 according to the present embodiment. As shown in FIG. 4, the hydrogen supply system 1 includes a PV power generation output (see a solid line L <b> 1) of the photovoltaic power generation (PV) devices 12-1 to 12-n and a water supply from the photovoltaic power generation devices 12-1 to 12-n. A power transmission output (see a broken line L2) in which generated power is transmitted to the transmission line 15 via the electrolysis devices 13-1 to 13-n and a water electrolysis device from the photovoltaic (PV) devices 12-1 to 12-n The operation control of the hydrogen supply system 1 is performed from the viewpoint of the water electrolysis supply power (see the dashed line L3) for supplying the generated power to the water electrolysis of 13-1 to 13-n.

  In the example shown in FIG. 4, the hydrogen supply system 1 is controlled so that the power transmission output does not exceed a predetermined upper limit value (for example, rated power transmission capacity: 2.0 MW: see S1 in FIG. 4). . Thereby, for example, when the amount of sunshine increases during the daytime, even if the power generation output is near 3.0 MW, the power transmission output to the transmission line 15 is 2.0 MW, and the remaining power generation is Water electrolysis supply power. With such control, even when the large-output photovoltaic power generation devices 12-1 to 12-n are connected to the transmission line 15 having a small power transmission capacity, the photovoltaic power generation devices 12-1 to 12-n The generated output can be effectively used as transmission power and water electrolysis supply power by water electrolysis.

  FIG. 5 is a diagram illustrating another example of the operation control of the hydrogen supply system 1 according to the present embodiment. In the example shown in FIG. 5, a threshold value S2 (set to about 0.7 MW in the example of FIG. 5) is provided for the output change rate of the power transmission output instead of the predetermined value of the power transmission output of FIG. The operation control of the hydrogen supply system 1 is performed so as not to exceed S2. In this case, even when there is a large change in the amount of sunlight and a large change in the system voltage of the power system of the distribution line 11 and the transmission line 15, the change in the system voltage can be reduced. In addition, it is possible to reduce the load of a power supply / demand adjustment measure.

  FIG. 6 is a diagram illustrating another example of the operation control of the hydrogen supply system 1 according to the present embodiment. In the example shown in FIG. 6, a planned target value (see a two-dot chain line L4) is provided every predetermined time instead of the predetermined value of the power transmission output of FIG. 4, and the hydrogen supply system is set so that the power transmission output matches the planned target value. 1 operation control is performed. As the planned target value, for example, a planned power generation amount for a predetermined time set in advance from weather information or the like is used. By performing such control, the accuracy of the power supply and demand plan can be improved, and the load of operation adjustment measures can be reduced.

  In the above-described operation control shown in FIGS. 4 to 6, operation control is performed using external power as a virtual power plant (VPP) or a demand response (DR) demand response device. You may. In this case, for example, at night or the like when power generation output of the solar power generation devices 12-1 to 12-n cannot be obtained, the hydrogen supply system 1 procures a predetermined output power from the outside and performs water electrolysis. As a result, the water electrolyzers 13-1 to 13-n provided corresponding to the respective photovoltaic power generators 12-1 to 12-n can be utilized for the production of hydrogen by utilizing the external power. The hydrogen supply system 1 can be used even more effectively.

  As described above, according to the above embodiment, as shown in FIG. 7, the water electrolysis devices 13-1 to 13-n are provided corresponding to the solar power generation devices 12-1 to 12-n. Even if the power generated by the power generation fluctuates greatly, such as renewable energy such as sunlight, the water electrolyzer can efficiently convert it to hydrogen and use it. Thereby, as shown in FIG. 7, even when the solar power generation devices 12-1 to 12-n having the power generation output (see the solid line L <b> 5) equal to or higher than the rated power transmission capacity (see S <b> 3) are provided. The transmission power (see the broken line L6) can be secured based on a prediction in advance. As a result, the generated power using renewable energy can be greatly expanded without power grid reinforcement, and the water electrolysis supply power (the difference between the solid line L5 and the broken line L6) can be extremely increased without using a transmission line. Since it can be used efficiently, the use of renewable energy can be expanded with less waste, and the energy self-sufficiency rate can be improved. Moreover, the hydrogen obtained by the water splitting device is adjusted to a desired water content and can be used as hydrogen as a fuel for boilers and fuel cells, hydrogen used in manufacturing and processing devices, and hydrogen for fuel cell vehicles and the like. And the promotion of global warming countermeasures, and the construction of a hydrogen fuel supply chain that enables non-fossilization of fossil fuels, which has been used in various industries, has become possible. Promotion of global warming countermeasures becomes possible.

  According to the above embodiment, since the water electrolysis devices 13-1 to 13-n are provided corresponding to the solar cell power generation devices 12-1 to 12-n, the water electrolysis devices 13-1 to 13-n are provided. By absorbing the generated power that fluctuates with n, it is possible to eliminate the cooperative connection capacity that occupies the connection frame at the rated output even when the power generation rate of the power system is low. Furthermore, by providing the water electrolyzers 13-1 to 13-n, it is possible to cut the power generation output of the solar power generation devices 12-1 to 12-n in which the power generation output fluctuates depending on the amount of solar radiation and the temperature. Therefore, the unstable power can be absorbed by connecting the photovoltaic power generators 12-1 to 12-n having a large output. Therefore, it is possible to realize a hydrogen supply system capable of efficiently producing and supplying hydrogen with the generated power of renewable energy.

  The present invention has an effect of realizing a hydrogen supply system and a hydrogen supply method capable of efficiently producing and supplying hydrogen with generated power of renewable energy, for example, by using renewable energy power generation such as a solar power generation device. It can be suitably used for a hydrogen supply system and a hydrogen supply method for supplying hydrogen.

1,100 Hydrogen supply system 11 Distribution line 12-1 to 12-n Solar power generation device 13-1 to 13-n Water electrolysis device 14 Humidity control device 15 Transmission line 16 Hydrogen utilization equipment 21 Low pressure gas 22 High pressure gas 31 Boiler 32 Fuel cell 33 Manufacturing and processing equipment 34 Transportation equipment

Claims (7)

At least one renewable energy power generation device that generates power by renewable energy generation;
Hydrogen is generated by electrolysis of water using at least one of the generated power supplied from the at least one renewable energy power generator and the generated power transmitted from the at least one renewable energy power generator to a distribution line. At least one water electrolyzer,
A hydrogen supply system, comprising: a humidity control device that adjusts the amount of water contained in the hydrogen to a desired range and supplies the adjusted amount to a hydrogen utilization facility.   The hydrogen supply system according to claim 1, wherein the water electrolyzer is a solid polymer membrane water electrolyzer.   The hydrogen supply system according to claim 1, wherein the renewable energy power generation device is a solar power generation device.   4. The water electrolysis device according to claim 1, wherein the water electrolysis device controls a transmission output of the generated power transmitted from the renewable energy power generation device to a transmission line so as not to exceed a preset upper limit value. 5. The hydrogen supply system according to claim 1.   The water electrolysis device controls the transmission output of the generated power transmitted from the renewable energy power generation device to a transmission line so as not to exceed a preset output change rate. The hydrogen supply system according to any one of the above.   The water electrolysis device according to any one of claims 1 to 3, wherein the water electrolysis device controls a transmission output of the generated power transmitted from the renewable energy power generation device to a transmission line based on a preset planned power generation amount. The hydrogen supply system according to claim 1. Obtaining generated power by power generation using renewable energy by at least one renewable energy power generation device;
At least one of the generated power supplied from the at least one renewable energy power generation device by at least one water electrolysis device and the generated power transmitted to a distribution line from the at least one renewable energy power generation device was used. Obtaining hydrogen by electrolysis of water;
Adjusting the amount of water contained in the hydrogen to a desired range and supplying it to a hydrogen utilization facility.

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