Energy supply system and energy supply method

Abstract

To provide an energy supply system and an energy supply method capable of supplying more stably energy using renewable energy.SOLUTION: An energy supply system according to the present invention comprises: a power generation facility that uses renewable energy to generate power; a hydrogen energy conversion facility capable of converting power generated by the power generation facility to hydrogen energy; a storage facility having a power storage facility capable of storing the power generated by the power generation facility and a hydrogen energy storage facility capable of storing the hydrogen energy converted by the hydrogen energy conversion facility; a power supply facility capable of supplying power from the power generation facility and / or the storage facility; a hydrogen energy supply facility that supplies the hydrogen energy from the storage facility; and a control facility that controls energy quantity stored in the storage facility out of the power generated by the power generation facility.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an energy supply system and an energy supply method.

Background Art

[0002] It is widely recognized that reducing carbon dioxide emissions globally is important for preventing global warming. One of the important methods to achieve the reduction of carbon dioxide emissions is to utilize renewable energy on a large scale.

[0003] On the other hand, in order to utilize renewable energy on a large scale, it is necessary to construct a system that can supply power stably.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide an energy supply system and an energy supply method that can supply energy more stably using renewable energy.

Means for Solving the Problems

[0006] An energy supply system according to one aspect of the present invention includes a power generation facility that generates power using renewable energy, a hydrogen energy conversion facility that can convert the power generated by the power generation facility into hydrogen energy, A storage facility comprising: an electricity storage facility capable of storing electricity generated by the aforementioned power generation facility; and a hydrogen energy storage facility capable of storing hydrogen energy converted by the aforementioned hydrogen energy conversion facility, A power supply facility capable of supplying electricity from the aforementioned power generation facility and / or storage facility, A hydrogen energy supply facility that supplies hydrogen energy from the aforementioned storage facility, The power generation equipment is characterized by comprising a control device that controls the amount of energy stored in the storage device from the electricity generated by the power generation equipment.

[0007] Furthermore, an energy supply system according to one aspect of the present invention further comprises a hydrogen energy power generation facility that generates electricity using hydrogen energy stored in the hydrogen energy storage facility, and the power supply facility is characterized in that it can receive power from the hydrogen energy power generation facility.

[0008] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the hydrogen energy conversion equipment can convert electricity stored in the power storage equipment into hydrogen energy.

[0009] Furthermore, in one aspect of the present invention, the energy supply system is characterized in that the power storage equipment has a battery.

[0010] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the hydrogen energy conversion equipment includes a water electrolysis equipment.

[0011] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the hydrogen energy storage facility stores hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydride, ammonia, and methanol.

[0012] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the control equipment controls the ratio of hydrogen energy supplied by the hydrogen energy supply equipment to electricity supplied by the power supply equipment to 4.0 or less.

[0013] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the renewable energy includes solar and wind power.

[0014] Furthermore, an energy supply system according to one aspect of the present invention is characterized in that the renewable energy further includes at least one selected from the group consisting of hydropower, naturally occurring heat, biomass, and ocean energy.

[0015] An energy supply method according to one aspect of the present invention comprises a power generation process in which renewable energy is used to generate electricity in a power generation facility, A ratio control process in which a control device controls the ratio of electricity obtained in the power generation process to be directly supplied, the ratio to be stored in a power storage facility, and the ratio to be converted into hydrogen energy in a hydrogen energy conversion facility. A hydrogen energy storage process in which the hydrogen energy converted by the hydrogen energy conversion equipment is stored in a hydrogen energy storage facility, A power supply facility comprising a power supply process that supplies power from the power generation facility and / or the power storage facility and / or the hydrogen energy storage facility, The hydrogen energy supply equipment is characterized by comprising a hydrogen energy supply process that supplies hydrogen energy from the hydrogen energy storage equipment. Furthermore, one aspect of the present invention further comprises a hydrogen energy power generation process in which a hydrogen energy power generation facility generates electricity using hydrogen energy stored in the hydrogen energy storage facility, and the power supply facility further supplies electricity from the hydrogen energy power generation facility.

[0016] Further, the energy supply method according to one aspect of the present invention further includes a step of converting the electric power stored in the power storage facility into hydrogen energy by the hydrogen energy conversion facility.

[0017] Further, the energy supply method according to one aspect of the present invention is characterized in that the power storage facility stores electric power in a battery.

[0018] Further, the energy supply method according to one aspect of the present invention is characterized in that the hydrogen energy conversion facility converts electric power into hydrogen energy by water electrolysis.

[0019] Further, the energy supply method according to one aspect of the present invention is characterized in that the hydrogen energy storage facility stores hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydride, ammonia, and methanol.

[0020] Further, the energy supply method according to one aspect of the present invention is characterized in that the renewable energy includes sunlight and wind power.

[0021] Further, the energy supply method according to one aspect of the present invention is characterized in that the renewable energy further includes at least one selected from the group consisting of hydropower, heat existing in nature, biomass, and ocean energy.

[0022] Further, when the power generation facility does not include biomass, the energy supply method according to one aspect of the present invention is controlled to prioritize direct power supply from renewable energy. When surplus power from renewable energy is generated, it is controlled to prioritize storing the power in the power storage facility, and then to prioritize storing hydrogen energy in the hydrogen energy storage facility. When power shortage occurs from renewable energy, it is characterized by controlling to prioritize the discharge from the power storage facility, and then controlling to prioritize power generation using the hydrogen energy stored in the hydrogen energy storage facility.

[0023] Also, in the energy supply method according to one aspect of the present invention, when the power generation facility includes biomass, it is controlled to prioritize the direct power supply from renewable energy, When surplus power occurs from renewable energy excluding biomass, it is controlled to prioritize storing the power in the power storage facility, then controlling to prioritize storing hydrogen energy in the hydrogen energy storage facility, and then controlling to prioritize suppressing the output of surplus power from renewable energy excluding biomass, When power shortage occurs from renewable energy excluding biomass, it is characterized by controlling to prioritize the discharge from the power storage facility, then controlling to prioritize power generation using the hydrogen energy stored in the hydrogen energy storage facility, and further controlling to prioritize power generation by biomass.

[0024] Also, the energy supply method according to one aspect of the present invention further calculates and controls the combination of the amount of renewable energy facilities and the amount of hydrogen-related facilities so as to minimize the total of the renewable energy facility cost and the hydrogen-related facility cost from the assumed power generation time pattern of renewable energy excluding biomass.

[0025] Also, the energy supply method according to one aspect of the present invention further calculates and controls the combination of the amount of renewable energy facilities, the amount of hydrogen-related facilities, and the amount of biomass-related facilities so as to minimize the total of the renewable energy facility cost, the hydrogen-related facility cost, the biomass-related facility cost, and the biomass fuel cost from the assumed power generation time pattern of renewable energy excluding biomass.

Effect of the Invention

[0026] According to the present invention, it is possible to provide an energy supply system and an energy supply method that can supply energy more stably using renewable energy. [Brief explanation of the drawing]

[0027] [Figure 1] Figure 1 is a schematic diagram of an energy supply system according to an embodiment of the present invention. [Figure 2] Figure 2 is a flowchart showing an energy supply method according to an embodiment of the present invention. [Figure 3] Figure 3 shows the time-dependent changes in standardized solar and wind power in eastern Japan. [Figure 4] Figure 4 shows the model's dataset. [Figure 5] Figure 5 shows the simulation results when the presence or absence of control equipment is varied. [Figure 6] Figure 6 shows the simulation results when the type of renewable energy is changed. [Figure 7] Figure 7 shows the numerical results of the simulation. [Figure 8] Figure 8 shows the simulation results when the type of renewable energy is changed. [Figure 9] Figure 9 shows the numerical results of the simulation. [Figure 10] Figure 10 is a diagram showing the energy flow. [Figure 11] Figure 11 shows the simulation results when the type of renewable energy source is changed, while the energy supply is hydrogen energy. [Figure 12] Figure 12 shows the numerical results of the simulation. [Figure 13] Figure 13 shows the simulation results of the supply ratio and cost of electricity and hydrogen energy. [Modes for carrying out the invention]

[0028] The present invention will be described below through embodiments of the invention, but these embodiments are not intended to limit the invention as defined in the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention. First, an energy supply system 100 according to one embodiment of the present invention will be described.

[0029] Energy supply system 100 Figure 1 is a schematic diagram of an energy supply system 100 according to an embodiment of the present invention. As shown in Figure 1, the estimation method of the energy supply system 100 according to an embodiment of the present invention is A power generation facility 11 that generates electricity using renewable energy, A hydrogen energy conversion device 12 that can convert the electricity generated by the aforementioned power generation device 11 into hydrogen energy, Storage facility 13 having a power storage facility 131 capable of storing electricity generated by the power generation facility 11, and a hydrogen energy storage facility 132 capable of storing hydrogen energy converted by the hydrogen energy conversion facility 12, A power supply facility 14 that can supply electricity from the power generation facility 11 and / or the storage facility 13, A hydrogen energy supply facility 15 that supplies hydrogen energy from the storage facility 13, The system is characterized by comprising a control device 16 that controls the amount of energy stored in the storage device 13 from the electricity generated by the power generation device 11.

[0030] <Power generation equipment 11> The power generation facility 11 generates electricity using renewable energy. Renewable energy sources include solar, wind, hydro, naturally occurring heat, biomass, and ocean energy. Naturally occurring heat sources include geothermal energy, atmospheric heat, ground source heat, temperature difference energy, snow and ice heat, and unused heat. Ocean energy sources include wave power, tidal currents, and ocean thermal energy conversion. The power generation facility 11 can use known equipment.

[0031] As shown in Figure 1, in the energy supply system 100 according to an embodiment of the present invention, it is preferable that the renewable energy includes solar and wind power. Compared to other renewable energy sources, solar and wind power have relatively fewer restrictions on the location where they can be generated. Therefore, the energy supply system 100 can supply energy more stably. In addition, by generating electricity using multiple renewable energy sources, even if the amount of electricity generated from one renewable energy source decreases, the amount of electricity generated from other renewable energy sources can be covered. This allows the energy supply system 100 to supply energy more stably.

[0032] It is even more preferable that renewable energy sources include at least one selected from the group consisting of hydropower, naturally occurring heat, biomass, and ocean energy. By increasing the types of renewable energy used for power generation, the energy supply system 100 can stably supply energy. For example, while the amount of power generated by solar and wind power depends on the weather, the amount of power generated by hydropower, naturally occurring heat, and biomass tends to be less affected by the weather. Also, solar and wind power have relatively few restrictions on where they can be generated, so even if the amount of power generated in one area decreases, power can be generated in other areas. On the other hand, hydropower, geothermal, and ocean energy are limited to areas where they can be generated, so there is a limit to how much power can be increased. In addition, since the power generation sites and energy consumption sites are often far apart for hydropower, geothermal, and ocean energy, it is necessary to construct long-distance transmission facilities. By combining various types of renewable energy sources for power generation, stable power generation can be achieved, and energy can be stably supplied to a wide area.

[0033] The electricity generated by the power generation equipment 11 may be used directly for power supply, or it may be stored as energy in the storage equipment 13. If the electricity is stored in the storage equipment 13, it may be converted into hydrogen energy in the hydrogen energy conversion equipment 12 before being stored.

[0034] <Hydrogen energy conversion equipment 12> The hydrogen energy conversion equipment 12 can convert electricity generated by the power generation equipment 11 into hydrogen energy. The hydrogen energy conversion equipment 12 may also be a water electrolysis equipment. Examples of water electrolysis equipment include those that utilize alkaline water electrolysis and those that utilize polymer electrolyte membrane (PEM) water electrolysis.

[0035] The hydrogen energy conversion equipment 12 may convert the electricity stored in the power storage equipment 131 into hydrogen energy.

[0036] Hydrogen energy is easier to store than electricity. Furthermore, hydrogen energy experiences less energy loss during long-distance transport compared to electricity. Therefore, by having a hydrogen energy conversion facility 12 that can convert electricity into hydrogen energy, electricity can be converted into hydrogen energy when there is a surplus of electricity generated by the power generation facility 11 or when there is a shortage of storage capacity in the electricity storage facility 131. This reduces energy loss in the energy supply system 100. As a result, energy can be supplied stably. Additionally, since hydrogen energy itself can be consumed, it can be supplied when the demand for hydrogen energy as final energy consumption increases. This further contributes to a more stable energy supply.

[0037] <Storage facility 13> The storage facility 13 can store a portion of the electricity generated by the power generation facility 11 when there is a surplus. Furthermore, if there is a shortage of electricity generated by the power generation facility 11, the storage facility 13 can replenish the shortage by releasing the stored energy. This ensures a stable energy supply.

[0038] The storage facility 13 includes an electricity storage facility 131 and a hydrogen energy storage facility 132. Because the storage facility 13 includes both the electricity storage facility 131 and the hydrogen energy storage facility 132, the form of energy stored can be flexibly changed depending on the final energy consumption situation. This allows for a stable energy supply.

[0039] (Electricity storage equipment 131) The power storage facility 131 can store electricity generated by the power generation facility 11. The power storage facility 131 can supply the stored energy as electricity. The power storage facility 131 can supply the stored energy to the hydrogen energy conversion facility 12. The power storage facility 131 may have a battery.

[0040] (Hydrogen energy storage facility 132) The hydrogen energy storage facility 132 can store the hydrogen energy converted by the hydrogen energy conversion facility 12. The hydrogen energy storage facility 132 may store the hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol.

[0041] Renewable energy sources exhibit significant fluctuations in available energy depending on location and time. Therefore, having storage facilities 13 allows for adjustment of energy supply even when available energy levels fluctuate. Furthermore, having multiple types of energy storage means reduces energy loss during supply, even when the distance between energy storage locations and energy consumption locations varies. As a result, a stable energy supply can be achieved.

[0042] <Power supply equipment 14> The power supply equipment 14 can supply electricity from the power generation equipment 11 and / or the storage equipment 13. The power supply equipment 14 may have, for example, transmission lines and means of transporting stored energy. Means of transport include, for example, cars, airplanes, and trains. When supplying electricity via transmission lines, the stored energy may be supplied as electricity from the power storage equipment 131 via transmission lines. When supplying by transporting stored energy, the stored energy may be transported to the energy consumption site by means of transport. When the power supply equipment 14 supplies hydrogen energy stored in the hydrogen energy storage equipment 132, the hydrogen energy may be converted into electricity by the hydrogen energy power generation equipment 17 before being supplied. The power supply equipment 14 does not need to be in operation at all times. For example, if there is no demand for electricity but there is a demand for hydrogen energy, only the hydrogen energy supply equipment 15 may be operated and the power supply equipment 14 may be shut down.

[0043] <Hydrogen energy supply equipment 15> The hydrogen energy supply equipment 15 supplies hydrogen energy stored in the hydrogen energy storage equipment 132. Examples of hydrogen energy supply forms include compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol. The hydrogen energy supply equipment 15 may be, for example, a pipeline or a storage tank. The hydrogen energy supply equipment 15 may have means of transport such as cars, airplanes, ships, or trains. The hydrogen energy supply equipment 15 does not need to be in operation at all times; for example, if there is no demand for hydrogen energy but there is a demand for electricity, only the electricity supply equipment 14 may be operated and the supply from the hydrogen energy supply equipment 15 may be stopped.

[0044] <Control equipment 16> The control equipment 16 controls the amount of energy stored in the storage equipment 13 from the electricity generated by the power generation equipment 11. The control equipment 16 may also control the amount of energy stored in the storage equipment 13 based on the amount of electricity consumed.

[0045] The control equipment 16 may control the ratio of hydrogen energy supplied by the hydrogen energy supply equipment 15 to the electricity supplied by the power supply equipment 14. The electricity supplied by the power supply equipment 14 refers to the energy that is ultimately supplied as electricity from the electricity generated by the power generation equipment 11. The hydrogen energy supplied by the hydrogen energy supply equipment 15 refers to the energy that is ultimately supplied as hydrogen energy from the electricity generated by the power generation equipment 11.

[0046] The control equipment 16 preferably controls the ratio of hydrogen energy supplied by the hydrogen energy supply equipment 15 to the electricity supplied by the power supply equipment 14 to 0.5 to 2.0. This further reduces the cost of electricity supplied by the energy supply system 100.

[0047] The control equipment 16 may be operated using the electricity generated by the power generation equipment 11. The control equipment 16 may control the operation of all equipment included in the energy supply system 100.

[0048] <Hydrogen energy power generation facility 17> The hydrogen energy power generation facility 17 generates electricity using hydrogen energy stored in the hydrogen energy storage facility 132. The electricity generated by the hydrogen energy power generation facility 17 is supplied as electricity by the power supply facility 14. The hydrogen energy power generation facility 17 may have a fuel cell.

[0049] If there is a shortage in the power supply, the hydrogen energy power generation facility 17 compensates for the shortage by converting stored hydrogen energy into electricity. This ensures a stable supply of energy. The hydrogen energy power generation facility 17 does not need to operate if there is no shortage in the power supply.

[0050] Next, an energy supply method according to another embodiment of the present invention will be described.

[0051] ≪Energy Supply Methods≫ Figure 2 is a flowchart showing an energy supply method according to an embodiment of the present invention. As shown in Figure 2, the energy supply method according to an embodiment of the present invention is The power generation process involves generating electricity using renewable energy in power generation equipment, A ratio control process in which control equipment controls the ratio of electricity obtained in the power generation process to be directly supplied, the ratio to be stored in power storage facilities, and the ratio to be converted into hydrogen energy in hydrogen energy conversion facilities. A hydrogen energy storage process in which hydrogen energy converted by a hydrogen energy conversion facility is stored in a hydrogen energy storage facility, A power supply facility includes a power supply process that supplies electricity from a power generation facility and / or a power storage facility and / or a hydrogen energy storage facility, A hydrogen energy supply facility is characterized by comprising a hydrogen energy supply process that supplies hydrogen energy from a hydrogen energy storage facility.

[0052] <Power generation process> In the power generation process, renewable energy is used to generate electricity in power generation equipment. Examples of renewable energy include solar, wind, hydro, naturally occurring heat, biomass, and ocean energy. Examples of naturally occurring heat include geothermal energy, atmospheric heat, ground source heat, temperature difference energy, snow and ice heat, and unused heat. Examples of ocean energy include wave power, tidal currents, and ocean thermal energy conversion. Known power generation equipment can be used.

[0053] The renewable energy preferably includes solar and wind power. The renewable energy provides an energy supply method characterized by including solar and wind power. The renewable energy is more preferably further to include at least one selected from the group consisting of hydropower, naturally occurring heat, biomass, and ocean energy.

[0054] <Rational control process> In the ratio control process, the control equipment controls the ratio of electricity obtained in the power generation process to be directly supplied, the ratio to be stored in the power storage facility, and the ratio to be converted into hydrogen energy in the hydrogen energy conversion facility. In the ratio control process, ratio control may be performed using values ​​such as the amount of electricity demanded, the amount of hydrogen energy demanded, and the amount stored in the storage facility.

[0055] The control equipment preferably controls the ratio of hydrogen energy supplied by the hydrogen energy supply equipment to the electricity supplied by the power supply equipment to 4.0 or less. More preferably, the control equipment controls the ratio of hydrogen energy supplied by the hydrogen energy supply equipment to the electricity supplied by the power supply equipment to 0.5 to 2.0 or less. This further reduces the cost of electricity supplied by the energy supply system. Electricity supplied by the power supply equipment refers to the energy that is ultimately supplied as electricity from the electricity generated by the power generation equipment. Hydrogen energy supplied by the hydrogen energy supply equipment refers to the energy that is ultimately supplied as hydrogen energy from the electricity generated by the power generation equipment.

[0056] <Hydrogen energy storage process> In the hydrogen energy storage process, the hydrogen energy converted by the hydrogen energy conversion equipment is stored in the hydrogen energy storage equipment.

[0057] The hydrogen energy storage facility stores hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol.

[0058] A hydrogen energy conversion facility may convert electricity generated by a power generation facility into hydrogen energy. A hydrogen energy conversion facility may also be a water electrolysis facility. Examples of water electrolysis facilities include those utilizing alkaline water electrolysis and those utilizing polymer electrolyte membrane (PEM) water electrolysis.

[0059] Compared to electricity, hydrogen energy is easier to store. Furthermore, compared to electricity, hydrogen energy experiences less energy loss during long-distance transport. Therefore, by converting electricity into hydrogen energy using hydrogen energy conversion equipment, energy loss during energy supply can be reduced. As a result, a stable energy supply can be achieved. Additionally, since hydrogen energy itself can be consumed, it can be supplied when the demand for hydrogen energy as a final energy source increases. This further contributes to a more stable energy supply.

[0060] <Power supply process> In the power supply process, power supply equipment supplies electricity from power generation equipment and / or power storage equipment and / or hydrogen energy storage equipment. When supplying electricity from power generation equipment, the electricity generated by the power generation equipment may be supplied to the power consumption area by the power supply equipment. When supplying electricity from power storage equipment, the electricity stored in the power storage equipment may be supplied to the power consumption area by the power supply equipment. When supplying electricity from hydrogen energy storage equipment, the hydrogen energy stored in the hydrogen energy storage equipment may be converted into electricity by a hydrogen energy conversion equipment and supplied to the power consumption area by the power supply equipment.

[0061] In the power supply process, electricity can be supplied from at least one of the following locations: power generation facilities, power storage facilities, and hydrogen energy storage facilities. This allows for flexible adjustment of the supply amount according to the demand for electricity. As a result, a stable energy supply can be achieved.

[0062] <Hydrogen energy supply process> In the hydrogen energy supply process, hydrogen energy is supplied from hydrogen energy storage facilities to hydrogen energy supply equipment. Since there is a demand for hydrogen energy, supplying hydrogen energy can meet that demand.

[0063] Examples of hydrogen energy supply forms include compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol. Hydrogen energy supply equipment may include, for example, pipelines and storage tanks. Hydrogen energy supply equipment may also include means of transport such as cars, airplanes, ships, and trains.

[0064] <Hydrogen energy power generation process> In the hydrogen energy power generation process, electricity is generated using hydrogen energy stored in a hydrogen energy storage facility at the hydrogen energy power generation facility. The electricity generated by the hydrogen energy power generation facility may also be supplied by a power supply facility. The hydrogen energy power generation facility may include a fuel cell.

[0065] By generating electricity using hydrogen energy stored in hydrogen energy storage facilities, it is possible to supplement the insufficient supply of electricity. This will enable a more stable energy supply.

[0066] <Hydrogen energy conversion process> The hydrogen energy conversion process involves converting electricity stored in a power storage facility into hydrogen energy using a hydrogen energy conversion unit. This allows for more flexible adjustment of the ratio between the final amount of electricity supplied and the amount of hydrogen energy supplied. As a result, energy can be supplied more stably.

[0067] In this embodiment, when the power generation equipment does not include biomass, the system may be controlled to prioritize direct power supply from renewable energy. Furthermore, when surplus power is generated from renewable energy, the system may be controlled to prioritize battery storage, and then to prioritize hydrogen energy storage through water electrolysis. In other words, the priority order is battery discharge followed by hydrogen power generation from stored hydrogen energy.

[0068] In this embodiment, if a power shortage occurs from renewable energy sources, the system may be controlled to prioritize battery discharge, and then to prioritize hydrogen power generation from stored hydrogen energy.

[0069] In this embodiment, when the power generation equipment includes biomass, the control may prioritize direct power supply from renewable energy sources excluding biomass. Furthermore, when surplus power is generated from renewable energy sources excluding biomass, the control may prioritize battery storage, and then prioritize hydrogen energy storage by water electrolysis. Next, the control may prioritize output suppression of surplus power from renewable energy sources excluding biomass.

[0070] In this embodiment, when the power generation equipment includes biomass, if a power shortage occurs from renewable energy sources other than biomass, the control may be set to prioritize battery discharge, then hydrogen power generation from stored hydrogen energy, and then biomass power generation. In other words, the control is set to prioritize battery discharge, hydrogen power generation from stored hydrogen energy, and then biomass power generation.

[0071] Furthermore, based on the above control, a control system may be implemented to calculate a combination of renewable energy equipment and hydrogen-related equipment quantities that minimizes the total cost of renewable energy equipment and hydrogen-related equipment, based on the assumed power generation time patterns of renewable energy excluding biomass.

[0072] Furthermore, based on the above control, the system may also be controlled to calculate combinations of renewable energy equipment, hydrogen-related equipment, and biomass-related equipment quantities such that the sum of renewable energy equipment costs, hydrogen-related equipment costs, biomass-related equipment costs, and biomass fuel costs is minimized, based on the assumed power generation time patterns of renewable energy excluding biomass. [Examples]

[0073] The effects of the present invention will be further described in detail below with reference to examples. The conditions in the examples are just one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is not limited to this one example of conditions. The present invention can adopt various conditions as long as it does not depart from the spirit of the invention and achieves the objectives of the present invention.

[0074] We explored a system for stably supplying power through simulation. Figure 3 shows the time-dependent changes in standardized power from solar and wind power in eastern Japan. That is, the values ​​are set to 1 when the maximum amount that solar and wind power can generate is achieved. The data shown in Figure 3 is from the reference (Journal of Electric Power & Energy Section), 134(9)(2014)799-810; Japan Meteorological Agency, AMeDAS). The data shown in Figure 3 was used as data for renewable energy generation.

[0075] Figure 4 shows the model's dataset. Note that the wind power is assumed to be offshore wind. Costs used are those from 2010.

[0076] Figure 5 shows the simulation results with and without control equipment. The simulation in Figure 5 assumes a scenario where only solar energy is used as renewable energy, only batteries are used as storage equipment, and energy supply is solely from electricity. The left side of Figure 5 shows the cost when control equipment is not used, and the right side shows the cost when control equipment is used.

[0077] Figure 6 shows the simulation results when the type of renewable energy source is changed. The left side of Figure 6 shows the cost when solar power is used, the middle side shows the cost when wind power is used, and the right side shows the cost when both solar and wind power are used.

[0078] The results in Figure 5 show that costs are lower when control equipment is in place. Furthermore, the results in Figure 6 show that combining solar and wind power is cheaper than using solar power alone or wind power alone. In other words, combining solar and wind power is more suitable for supplying electricity stably.

[0079] Figure 7 shows the numerical results of the simulation.

[0080] Figure 8 shows the simulation results when the type of renewable energy is varied. Renewable energy sources considered were solar power, wind power, and a combination of solar and wind power. Storage facilities considered were batteries and hydrogen storage. Energy supply considered was electricity and hydrogen energy. However, it was assumed that the final hydrogen energy supply was 0. As shown in Figure 8, compared with the results shown in Figure 6, it was found that the cost can be reduced when storage facilities use batteries and hydrogen storage. In other words, it was found that the cost can be reduced by using both batteries and hydrogen storage as storage facilities than by using batteries alone.

[0081] Figure 9 shows the numerical results of the simulation.

[0082] Figure 10 shows an energy flow diagram. Figure 10 shows a scenario where solar and wind power are used as renewable energy sources, batteries and hydrogen storage are used as storage facilities, and electricity and hydrogen energy are used as energy supplies.

[0083] Figure 11 shows the simulation results when the type of renewable energy source is changed, with hydrogen energy being the energy source. As shown in Figure 11, compared with the results shown in Figure 8, it was found that the cost is almost the same when the renewable energy source is wind power, but when the renewable energy source is solar power, or a combination of solar power and wind power, supplying hydrogen energy is cheaper.

[0084] Figure 12 shows the numerical results of the simulation.

[0085] Figure 13 shows the simulation results of the supply ratio and cost of electricity and hydrogen energy. As shown in Figure 13, it was found that the lowest cost is achieved when the supply ratio of electricity and hydrogen energy is 1. In other words, it was found that costs can be reduced by controlling the supply ratio of electricity and hydrogen energy to approach 1. Therefore, it was found that energy can be supplied more stably by constructing a system that controls the supply ratio of electricity and hydrogen energy to approach 1.

[0086] When a specification, in its entirety, states that a part "has" or "includes" a certain component, this means, unless otherwise stated, that it does not exclude other components, but rather may include other components.

[0087] Furthermore, the term "...part" as used in the specification means a unit that processes at least one function or operation, which may be embodied as hardware or software, or as a combination of hardware and software.

[0088] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present invention. Also, the above-described modifications may be combined as appropriate. [Industrial applicability]

[0089] Based on the above, the present invention provides an energy supply system and energy supply method that can supply energy more stably using renewable energy, and therefore has high industrial value. [Explanation of Symbols]

[0090] 100 Energy supply systems 11 Power generation facilities 12. Hydrogen energy conversion equipment 131 Power storage facilities 132 Hydrogen energy storage facilities 13 Storage facilities 14 Power supply equipment 15. Hydrogen energy supply facilities 16 Control Equipment

Claims

1. Power generation facilities that generate electricity using renewable energy, A hydrogen energy conversion facility capable of converting electricity generated by the aforementioned power generation facility into hydrogen energy, A storage facility comprising: an electricity storage facility capable of storing electricity generated by the aforementioned power generation facility; and a hydrogen energy storage facility capable of storing hydrogen energy converted by the aforementioned hydrogen energy conversion facility, A power supply facility capable of supplying electricity from the aforementioned power generation facility and / or storage facility, A hydrogen energy supply facility that supplies hydrogen energy from the aforementioned storage facility, A control system that controls the amount of energy stored in the storage facility from the electricity generated by the power generation facility, Equipped with, When the aforementioned power generation facility does not include biomass, it is controlled to prioritize the direct supply of electricity from renewable energy sources. When surplus electricity is generated from renewable energy sources, the system will prioritize storing the electricity in an energy storage facility, then prioritizing the storage of hydrogen energy in a hydrogen energy storage facility, and finally prioritizing the reduction of output from the surplus electricity from renewable energy sources. If a power shortage occurs from renewable energy sources, the system will be controlled to prioritize the discharge of electricity from power storage facilities, and then to prioritize generating electricity using hydrogen energy stored in hydrogen energy storage facilities. An energy supply system characterized by the following features.

2. A power generation facility that generates electricity using renewable energy, A hydrogen energy conversion facility capable of converting electricity generated by the aforementioned power generation facility into hydrogen energy, A storage facility comprising: an electricity storage facility capable of storing electricity generated by the aforementioned power generation facility; and a hydrogen energy storage facility capable of storing hydrogen energy converted by the aforementioned hydrogen energy conversion facility, A power supply facility capable of supplying electricity from the aforementioned power generation facility and / or storage facility, A hydrogen energy supply facility that supplies hydrogen energy from the aforementioned storage facility, A control system that controls the amount of energy stored in the storage facility from the electricity generated by the power generation facility, Equipped with, When the aforementioned power generation facility includes biomass, the system is controlled to prioritize the direct power supply from renewable energy sources excluding biomass. When surplus electricity is generated from renewable energy sources other than biomass, the system will prioritize storing the electricity in an energy storage facility, then prioritizing the storage of hydrogen energy in a hydrogen energy storage facility, and finally prioritizing the reduction of output of surplus electricity from renewable energy sources other than biomass. If a power shortage occurs from renewable energy sources other than biomass, the system will be controlled to prioritize the discharge from power storage facilities, then to prioritize power generation using hydrogen energy stored in hydrogen energy storage facilities, and finally to prioritize power generation from biomass. An energy supply system characterized by the following features.

3. Furthermore, control the combination of renewable energy equipment and hydrogen-related equipment so as to minimize the total of renewable energy equipment costs and hydrogen-related equipment costs, based on the assumed power generation time patterns of renewable energy excluding biomass. The energy supply system according to claim 1, characterized in that it is the same as described in claim 1.

4. Furthermore, based on the assumed power generation time patterns of renewable energy excluding biomass, the system controls the combination of renewable energy equipment, hydrogen-related equipment, and biomass-related equipment so as to minimize the sum of renewable energy equipment costs, hydrogen-related equipment costs, biomass-related equipment costs, and biomass fuel costs. The energy supply system according to claim 2, characterized in that it is as described above.

5. Furthermore, the facility includes a hydrogen energy power generation facility that generates electricity using the hydrogen energy stored in the hydrogen energy storage facility. The aforementioned power supply equipment can be supplied with electricity from the aforementioned hydrogen energy power generation equipment. The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

6. The hydrogen energy conversion equipment can convert electricity stored in the power storage equipment into hydrogen energy. The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

7. The aforementioned power storage equipment has a battery The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

8. The hydrogen energy conversion equipment includes a water electrolysis equipment. The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

9. The hydrogen energy storage facility stores hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol. The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

10. The aforementioned renewable energy includes solar and wind power. The energy supply system according to any one of claims 1 to 4, characterized by the features described herein.

11. The aforementioned renewable energy further includes at least one selected from the group consisting of hydropower, naturally occurring heat, biomass, and ocean energy. The energy supply system according to claim 10, characterized in that it is the same as described above.

12. The power generation process involves generating electricity using renewable energy in power generation equipment, A ratio control process in which a control device controls the ratio of electricity obtained in the power generation process to be directly supplied, the ratio to be stored in a power storage facility, and the ratio to be converted into hydrogen energy in a hydrogen energy conversion facility. A hydrogen energy storage process in which the hydrogen energy converted by the hydrogen energy conversion equipment is stored in a hydrogen energy storage facility, A power supply facility comprising a power supply process that supplies power from the power generation facility and / or the power storage facility and / or the hydrogen energy storage facility, A hydrogen energy supply facility includes a hydrogen energy supply process that supplies hydrogen energy from the hydrogen energy storage facility, Equipped with, When the aforementioned power generation facility does not include biomass, it is controlled to prioritize the direct supply of electricity from renewable energy sources. When surplus electricity is generated from renewable energy sources, the system will prioritize storing the electricity in an energy storage facility, then prioritizing the storage of hydrogen energy in a hydrogen energy storage facility, and finally prioritizing the reduction of output from the surplus electricity from renewable energy sources. If a power shortage occurs from renewable energy sources, the system will be controlled to prioritize the discharge of electricity from power storage facilities, and then to prioritize generating electricity using hydrogen energy stored in hydrogen energy storage facilities. An energy supply method characterized by the following:

13. A power generation process for generating electricity using renewable energy in a power generation facility, A ratio control process in which a control device controls the ratio of electricity obtained in the power generation process to be directly supplied, the ratio to be stored in a power storage facility, and the ratio to be converted into hydrogen energy in a hydrogen energy conversion facility. A hydrogen energy storage process in which the hydrogen energy converted by the hydrogen energy conversion equipment is stored in a hydrogen energy storage facility, A power supply facility comprising a power supply process that supplies power from the power generation facility and / or the power storage facility and / or the hydrogen energy storage facility, A hydrogen energy supply facility includes a hydrogen energy supply process that supplies hydrogen energy from the hydrogen energy storage facility, Equipped with, When the aforementioned power generation facility includes biomass, the system is controlled to prioritize the direct power supply from renewable energy sources excluding biomass. When surplus electricity is generated from renewable energy sources other than biomass, the system will prioritize storing the electricity in an energy storage facility, then prioritizing the storage of hydrogen energy in a hydrogen energy storage facility, and finally prioritizing the reduction of output of surplus electricity from renewable energy sources other than biomass. If a power shortage occurs from renewable energy sources other than biomass, the system will be controlled to prioritize the discharge from power storage facilities, then to prioritize power generation using hydrogen energy stored in hydrogen energy storage facilities, and finally to prioritize power generation from biomass. An energy supply method characterized by the following:

14. Furthermore, based on the assumed power generation time patterns for renewable energy sources excluding biomass, the system controls the combination of renewable energy equipment and hydrogen-related equipment to minimize the total cost of renewable energy equipment and hydrogen-related equipment. The energy supply method according to feature 12.

15. Furthermore, based on the assumed power generation time patterns for renewable energy sources excluding biomass, the system controls the combination of renewable energy equipment, hydrogen-related equipment, biomass-related equipment, and biomass-related equipment to minimize the total cost of renewable energy equipment, hydrogen-related equipment, biomass-related equipment, and biomass fuel. The energy supply method according to feature 13.

16. Furthermore, the hydrogen energy power generation facility includes a hydrogen energy power generation process that generates electricity using hydrogen energy stored in the hydrogen energy storage facility, The aforementioned power supply facility further supplies electricity from the aforementioned hydrogen energy power generation facility. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

17. Furthermore, the hydrogen energy conversion equipment includes a step of converting the electricity stored in the power storage equipment into hydrogen energy. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

18. The aforementioned power storage equipment stores electricity in a battery. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

19. The aforementioned hydrogen energy conversion equipment converts electricity into hydrogen energy through water electrolysis. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

20. The hydrogen energy storage facility stores hydrogen energy in at least one form selected from the group consisting of compressed hydrogen, liquefied hydrogen, organic hydrides, ammonia, and methanol. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

21. The control equipment controls the ratio of hydrogen energy supplied by the hydrogen energy supply equipment to electricity supplied by the power supply equipment to 4.0 or less. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

22. The aforementioned renewable energy includes solar and wind power. The energy supply method according to any one of claims 12 to 15, characterized by the features described herein.

23. The aforementioned renewable energy further includes at least one selected from the group consisting of hydropower, naturally occurring heat, biomass, and ocean energy. The energy supply method according to feature 22.

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