Hydrogen production control system and method

Abstract

To provide a hydrogen production control system capable of producing hydrogen having different environmental loads.SOLUTION: A hydrogen production control system 20 that causes a hydrogen production device 10 to produce hydrogen is provided, wherein the hydrogen production device supplies electric power from a renewable energy power generation device 12 or from a power grid 30 to a water electrolysis device 13 to electrolyze water, thereby producing hydrogen having different environmental loads. The hydrogen production control system includes a renewable energy fluctuation prediction unit that predicts fluctuations in electric power supplied from the renewable energy power generation device, and a hydrogen-type production planning unit that creates a hydrogen-type production plan for causing the hydrogen production device to produce hydrogen having different environmental loads in accordance with a prediction result of the renewable energy fluctuation prediction unit. The hydrogen-type production planning unit creates a production plan for producing first hydrogen having a low environmental load among the hydrogen having different environmental loads, by using electric power in a first case in which the electric power is predicted to be stably supplied from the renewable energy power generation device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Hydrogen is attracting attention as an environmentally friendly fuel because it does not emit CO2 when used. There are various methods for producing hydrogen, including electrolyzing water. A device that produces hydrogen through electrolysis is called a water electrolysis device. Hydrogen produced from a water electrolysis device is sometimes classified according to the type of input electricity. Hydrogen produced from electricity with a low environmental impact, such as renewable energy, is called green hydrogen. On the other hand, electricity generated from fossil fuels has a high environmental impact, and hydrogen produced from such electricity has a high environmental impact, so it is called gray hydrogen. Because green hydrogen has a lower environmental impact than gray hydrogen, it has high environmental value for businesses aiming to achieve carbon neutrality. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7221376 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 states, "An apparatus for generating an operation plan for a hydrogen production control system equipped with a hydrogen generation device, the apparatus comprising: a demand prediction model generation unit that generates a demand prediction model for generating a predicted demand for each of multiple types of hydrogen using demand prediction factors including at least one of the demand for hydrogen at demand destinations for multiple types of hydrogen whose production has different environmental impacts prior to a target period of the operation plan, information on the demand destinations, consumption of the multiple types of hydrogen, weather information, predicted consumption of the multiple types of hydrogen during the target period, and an operation prediction of the hydrogen production control system; a demand prediction unit that generates a predicted demand for each of the multiple types of hydrogen during the target period of the operation plan based on the demand prediction factors using the demand prediction model; and an operation planning unit that generates the operation plan for producing multiple types of hydrogen whose production has different environmental impacts using the hydrogen generation device based on the predicted hydrogen demand for each of the multiple types of hydrogen."

[0005] Water electrolysis devices must produce hydrogen using renewable energy, which generates a fluctuating amount of electricity. However, fluctuations in the amount of electricity input to the water electrolysis device raise concerns about deterioration of the device. Furthermore, because the amount of electricity from renewable energy sources fluctuates due to factors such as weather, it becomes difficult to stably and systematically produce hydrogen with different environmental impacts.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydrogen production control system and method for producing hydrogen with different environmental loads. [Means for solving the problem]

[0007] A hydrogen production control system according to one aspect of the present invention is a hydrogen production control system that causes hydrogen to be produced by a hydrogen production device, wherein the hydrogen production device produces hydrogen with different environmental loads by inputting the amount of electricity from a renewable energy power generation device that generates electricity using renewable energy or the amount of electricity from a power grid into a water electrolysis device to electrolyze water, and the system is equipped with a renewable energy fluctuation prediction unit that predicts fluctuations in the amount of electricity from the renewable energy power generation device, and a hydrogen-type production planning unit that creates hydrogen-type production plans for producing hydrogen with different environmental loads by the hydrogen production device according to the prediction results by the renewable energy fluctuation prediction unit, and the hydrogen-type production planning unit creates a production plan for producing a first hydrogen with a lower environmental load from among hydrogen with different environmental loads, using the amount of electricity for a first case in which the renewable energy fluctuation prediction unit predicts that the amount of electricity will be supplied stably from the renewable energy power generation device. [Effects of the Invention]

[0008] According to the present invention, the first hydrogen, which has a lower environmental load than other hydrogens with different environmental loads, can be produced using the amount of electricity in the first case, in which the amount of electricity is predicted to be stably supplied from the renewable energy power generation device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an entire system including a hydrogen production control system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing the functional configuration of the hydrogen production control system. [Figure 3] 1 is a graph showing an example of predicting fluctuations in renewable energy. [Figure 4] 10 is a flowchart showing a process for creating a hydrogen-type production plan. [Figure 5] FIG. 10 is an explanatory diagram showing an example of a hydrogen-type production plan. [Figure 6] FIG. 10 is an explanatory diagram showing a detailed example of a hydrogen-type production plan. [Figure 7] 10 is a flowchart showing a hydrogen type production process according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below with reference to the drawings. This embodiment discloses a hydrogen production control system that plans the production of hydrogen with different environmental loads. This hydrogen production control system estimates fluctuations in the amount of electricity generated using renewable energy, and creates a hydrogen-specific production plan that produces hydrogen with a low environmental load (first hydrogen, clean hydrogen) when the amount of electricity from the renewable energy power generation device is stable, and produces hydrogen with a high environmental load (second hydrogen, gray hydrogen) using grid power or the like when the amount of electricity from the renewable energy power generation device is unstable.

[0011] Furthermore, in this embodiment, hydrogen-type production plans are created so as to suppress fluctuations in the amount of electricity input to the water electrolysis device. As a result, the hydrogen production control system of this embodiment can switch the source of the amount of electricity input to the water electrolysis device depending on the power generation status of renewable energy, thereby enabling stable production of hydrogen with different environmental loads and preventing deterioration of the water electrolysis device. [Example]

[0012] The first embodiment will be described with reference to Figures 1 to 6. Figure 1 shows an overall system including an assumed hydrogen production control system 20.

[0013] The overall system includes, for example, a hydrogen production device 10 that produces hydrogen, and a hydrogen production control system 20 that controls the hydrogen production device 10. The hydrogen production device 10 and the hydrogen production control system 20 are connected to each other via a communication network CN so that they can communicate bidirectionally. The hydrogen production device 10 is connected to an electric power grid 30, and can use the amount of electricity from the electric power grid 30. The electric power grid 30 is also connected to various power generation devices and various electricity consumers (neither of which is shown) via power transmission and distribution facilities (not shown) and the like.

[0014] The hydrogen production device 10 includes, for example, a power storage device 11, a renewable energy power generation device 12, a water electrolysis device 13, and a hydrogen storage device 14. The hydrogen production device 10 is connected to a power grid 30. The power storage device 11, the renewable energy power generation device 12, the water electrolysis device 13, and the hydrogen storage device 14 can use electric power from the power grid 30.

[0015] The power storage device 11 charges the cells with the amount of power from the power grid 30 or the amount of power from the renewable energy power generation device 12 via a power conversion device (not shown), and discharges the charged amount of power from the cells. The amount of power discharged from the power storage device 11 is input to the water electrolysis device 13.

[0016] The renewable energy power generation device 12 is a device that generates power using renewable energy, such as sunlight, wind power, geothermal energy, solar heat, and wave power.

[0017] The water electrolysis device 13 is a device that produces hydrogen by electrolyzing water using input power. The water electrolysis device 13 receives power from the power storage device 11, the power generated by the renewable energy power generation device, and the power procured from the power grid 30.

[0018] The hydrogen storage device 14 stores the hydrogen produced by the water electrolysis device 13. The hydrogen storage device 14 can also supply the stored hydrogen to the outside.

[0019] The hydrogen production control system 20 can be configured using a computer. The hydrogen production control system 20 includes, for example, a processor 21, a memory 22, an auxiliary storage device 23, a communication unit 24, and a user interface unit 25.

[0020] The processor 21 loads a predetermined control program 200 stored in the auxiliary storage device 23 into the memory 22 and executes it, thereby realizing the functions of the hydrogen production control system 20, which will be described later with reference to Fig. 2. The processor 21 is not limited to a CPU (Central Processing Unit), but may also include a GPU (Graphics Processing Unit) or an ASIC (Application Specific Integrated Circuit), etc.

[0021] The hydrogen production control system 20 is capable of communicating with the devices 11, 12, 13, and 14 in the hydrogen production device 10 from the communication unit 24 via the communication network CN.

[0022] The user interface (abbreviated as UI in the drawing) unit 25 is a device for exchanging information between a user, such as a system administrator, and the hydrogen production control system 20.

[0023] The user interface unit 25 includes, for example, an information input device such as a keyboard, a touch panel, or a voice input device, and an information output device such as a monitor display, a printer, or a voice synthesizer. The information input device and the information output device may be integrated.

[0024] A recording medium MM can be connected to the hydrogen production control system 20. The storage medium MM is configured as, for example, a memory device, a hard disk device, an optical disk device, a magneto-optical disk device, or a magnetic tape device, and non-temporarily stores computer programs and data. The storage medium MM can transfer and store computer programs and data to the auxiliary storage device 23 of the hydrogen production control system 20. Conversely, computer programs and data can also be transferred and stored from the auxiliary storage device 23 to the storage medium MM. By storing a computer program that realizes the functions of the hydrogen production control system 20 in the storage medium MM, connecting the storage medium MM to another computer, and installing the computer program stored in the storage medium MM on the other computer, the other computer can function as the hydrogen production control system 20.

[0025] The functional configuration of the hydrogen production control system 20 will be described using Figure 2. The hydrogen production control system 20 includes, for example, an acquisition unit 201, a renewable energy fluctuation prediction unit 202, a hydrogen-type production plan unit 203, a hydrogen-type control unit 204, and an output unit 205.

[0026] The acquisition unit 201 acquires information required by the hydrogen production control system 20. For example, the acquisition unit 201 acquires predicted and actual values ​​of the power generation amount of the renewable energy power generation device 12, demand for each type of hydrogen, predicted values ​​of the electricity market price, specifications such as the rating and efficiency of the power storage device 11 and operational constraints such as upper and lower operational limits, specifications such as the rating and efficiency of the water electrolysis device 13 and operational constraints such as upper and lower operational limits, specifications such as the capacity of the hydrogen storage device 14, and the like.

[0027] The renewable energy fluctuation amount prediction unit 202 classifies the amount of power generated by the renewable energy power generation device 12 into stable amounts and unstable amounts using the predicted value and actual value of the amount of power generated by the renewable energy power generation device 12. For example, a confidence interval may be obtained using a probabilistic prediction method, and the amount of power generated by the renewable energy power generation device 12 may be classified into amounts with high accuracy and amounts with low accuracy.

[0028] Figure 3 is a graph showing an example of predicting fluctuations in renewable energy. The section (period) from time t0 to time tm is a time section in which the amount of power generation is stable, with unstable amounts (shown by the shaded areas in the figure) being smaller than stable amounts (shown by the open areas in the figure). The section from time tm to time tm is a section in which the unstable amount increases. The section from time tn to time ts is a section in which the unstable amount decreases again.

[0029] 4 shows the processing flow of the hydrogen-type production planning unit 203. In step S10, plan input information is acquired by the acquisition unit 201. The plan input information includes information acquired by the acquisition unit 201 and information calculated by the renewable energy fluctuation prediction unit 202.

[0030] In step S20, an objective function for optimization is set. The objective function can be set, for example, to minimize the hydrogen production cost. A term can be provided using linear summation to multiply the fluctuation in the amount of power input to the water electrolysis device 13 by the deterioration cost of the water electrolysis device 13 due to that fluctuation.

[0031] In step S30, constraints for optimization are set. In step S30, for example, constraints related to deterioration of the water electrolysis device 13 are set. Since a term related to fluctuations in input power was added in step S20, constraints related to this are set. Z_hprd,t,i in equation (1) described below is an auxiliary variable for expressing the absolute value of fluctuations in the amount of hydrogen produced at time t. Hprd,t is the amount of hydrogen produced at time t. In equation (1), the difference between the amount of hydrogen produced at time t and time t-1 is calculated. The absolute value can be expressed using equations (1) and (2), and in step S20, fluctuations in input power are expressed using Z_hprd,t.

[0032] -Z_hprd,t<= Hprd,t - Hprd,t-1...Equation (1) Z_hprd,t => Hprd,t- Hprd,t-1...Equation (2) Next, upper and lower limits for the amount of hydrogen produced that has a low environmental impact are set. A constraint is set with the stable amount classified in the renewable energy fluctuation amount prediction unit 202 as the upper limit. The lower limit can be "0".

[0033] In equation (3), P_stable,t is the stable amount. P_eff_hprd indicates the efficiency of hydrogen production and is the amount of electricity required per unit of hydrogen production. Equation (4) is a formula for calculating the amount of electricity P_hprdlow,t required to produce an amount of hydrogen with low environmental impact Hprd_low,t. Hprd_low,t is the amount of hydrogen produced with low environmental impact at time t. P_hprdlow,t is the amount of electricity required to produce hydrogen with low environmental impact.

[0034] 0<=Hprd_low,t×P_eff_hprd<=P_stable,t...Equation (3) P_hprdlow,t=Hprd_low,t×P_eff_hprd...Equation (4) The hydrogen-type production planning unit 203 sets upper and lower limits on the production volume of hydrogen that has a high environmental impact. Equation (5) shows the upper and lower limit constraints on the production volume of hydrogen that has a high environmental impact. The lower limit is set to "0". The upper limit is the sum of the unstable power generation amount P_unstable,t of the renewable energy power generation device 12, the power procurement amount P_grid,t from the power grid 30, and the discharge amount P_bat,t from the power storage device 11.

[0035] Equation (6) is an equation for calculating the amount of power P_hprdhigh,t required to produce an amount of hydrogen Hprd_high,t that has a high environmental impact. Equation (7) is an equation for making P_hprdhigh,t the total amount of power used from each power source 11, 12, 30. P_unstable_used,t is the amount used from the unstable power generation amount of the renewable energy power generation device 12 at time t. P_grid_used,t is the amount used from the amount of power procured from the power grid 30. P_bat_used,t is the amount used from the amount of power discharged from the power storage device 11.

[0036] In equation (5), P_unstable,t, P_grid,t, and P_bat,t are upper limits on the amount of power from each power source 11, 12, and 30, and equation (7) defines only the amount used therefrom.

[0037] 0<=Hprd_high,t×P_eff_hprd<=P_unstable,t+P_grid,t+P_bat,t...Equation (5) P_hprdhigh,t=Hprd_high,t×P_eff_hprd...Equation (6) P_hprdhigh,t= P_unstable_used,t+P_grid_used,t+P_bat_used,t...Formula (7) In equations (3) and (5), the amount of hydrogen produced is converted to the amount of electricity by multiplying it by the efficiency of hydrogen production P_eff_hprd, but in the case of a nonlinear efficiency function, it is also possible to express it using a piecewise linear model.

[0038] In this embodiment, it is also assumed that a threshold value for the amount of carbon dioxide emissions contained in hydrogen produced with a high environmental load is set. In equation (8), the total amount of carbon dioxide emissions when producing hydrogen with a high environmental load is C_co2_hprdhigh_total, and the planned time is T. The total amount of carbon dioxide emissions C_co2_hprdhigh_total is defined to be less than or equal to the sum of the amounts of hydrogen with a high environmental load Hprd_high,t from t=0 to t=T multiplied by the carbon dioxide emission coefficient per unit hydrogen C_co2_hprdhigh, which is the standard for hydrogen with a high environmental load.

[0039] Equation (9) is used to calculate the total carbon dioxide emissions C_co2_hprdhigh_total when producing hydrogen, which has a high environmental impact. It is the sum of the amount of electricity used from the power grid 30, P_grid_used,t, and its carbon dioxide emissions calculated from t=0 to t=T. Here, we have defined a case where only the amount of electricity from the power grid 30 includes carbon dioxide emissions. However, if electricity from the power grid 30 is stored in the power storage device 11, the amount of electricity stored (charged amount) in the power storage device 11 also includes carbon dioxide. In this case, the amount P_bat_used,t used from the power storage device 11 multiplied by the carbon dioxide emission coefficient can be added to equation (9). In this way, the carbon dioxide emission standard can be met when producing hydrogen, which has a high environmental impact.

[0040] C_co2_hprdhigh_total<=ΣHPrd_high,t×C_co2_threshold...Equation (8) C_co2_hprdhigh_total=ΣP_grid_used,t×C_co2_grid...Equation (9) Since the power storage device 11 is a controllable device, it is necessary to reserve a charge amount in preparation for the case where the amount of power generated by the renewable energy power generation device 12 is less than the predicted value. Therefore, a constraint is set so that the amount of power generated by the renewable energy power generation device 12 when it is unstable is kept equal to or less than the charge amount of the power storage device 11.

[0041] In equation (10), the total amount of power used from the amount of electricity when the power generation of the renewable energy power generation device 12 is unstable from t=0 to t=T is set to be less than the difference between the charge amount (remaining charge amount) SoC_bat,tpre at the time tpre before the plan and the amount P_bat_used,t used from the discharge amount of the storage device 11 from t=0 to t=T.

[0042] 0<=ΣP_unstable_used,t<=SoC_bat,tpre-ΣP_bat_used,t...Equation (10) If there is demand for the first and second hydrogen, each hydrogen must be produced in an amount greater than or equal to the demand. Equation (11) is a constraint that ensures that the total production amount Hprd_low,t of low-environmental-impact hydrogen during the planning period is greater than or equal to the demand Hcontracted_low of low-environmental-impact hydrogen during the planning period. Equation (12) is a constraint that ensures that the total production amount Hprd_high,t of high-environmental-impact hydrogen during the planning period is greater than or equal to the demand Hcontracted_high of low-environmental-impact hydrogen during the planning period.

[0043] Hcontracted_low<=ΣHprd_low,t...Equation (11) Hcontracted_high<=ΣHprd_high,t...Equation (12) In addition to the above constraints, constraints related to the specifications and operation of the equipment can be added, such as upper and lower limits on the capacity of the hydrogen storage device 14, start-up and stop constraints on the water electrolysis device 13, start-up and stop curve constraints, and upper and lower limit constraints on the capacity of the electricity storage device.

[0044] Returning to Fig. 4, step S40 is an optimization process. The optimization process is performed using the objective function set in step S20 and the constraints set in step S30. For example, the optimization process may be performed using an algorithm such as the branch and cut method, the branch and bound method, or the branch and cut pricing method.

[0045] In step S50, the optimization results obtained in step S40 are acquired. An example of the results is shown in Figure 5. Figure 5 shows an example of a hydrogen-type production plan.

[0046] As shown in Figure 5, a hydrogen-type production plan is created at time t, which is divided into hydrogen with a low environmental impact and hydrogen with a high environmental impact. Here, ΔH1, ΔH2, ΔH3, and ΔH4 are fluctuations during hydrogen production. Accordingly, in the detailed hydrogen-type production plan shown in Figure 6, the amounts of power ΔP1, ΔP2, ΔP3, and ΔP4 input to the water electrolysis system 13 are determined. The hydrogen-type production plan is created using an objective function to suppress fluctuations in the power input to the water electrolysis system 13.

[0047] In step S60, as will be described later, predetermined information including information such as that shown in FIG. 6 is output to a monitor display or the like.

[0048] Returning to FIG. 2, the hydrogen-type control unit 204 controls the devices 11, 12, 13, and 14 of the hydrogen production system 10 in accordance with the hydrogen-type production plan created by the hydrogen-type production planning unit 203. The hydrogen-type control unit 204 can perform control using model predictive control that takes into account the responsiveness of the devices 11, 12, 13, and 14. If the weather conditions are good and the amount of power generated by the solar or other renewable energy power generation device 12 is greater than predicted, the hydrogen-type control unit 204 controls the battery 11 to charge. This ensures that the amount of charge required for the next hydrogen-type production plan is secured.

[0049] The output unit 205 outputs, for example, the control details of the hydrogen-type control unit 204 and the results of the hydrogen-type production plan unit 203. The output unit 205 compares how the hydrogen-type production plan plans to produce hydrogen with the amount of hydrogen that was actually produced through control, and outputs the results. The output unit 205 creates and outputs a screen that compares the amount of carbon dioxide emissions contained in hydrogen at the time the hydrogen-type production plan was created with the actual amount of carbon dioxide emissions. Furthermore, the output unit 205 can also display the hydrogen-type production plans and the associated control results, such as those shown in Figures 5 and 6.

[0050] According to this embodiment configured as described above, the amount of power generated by the renewable energy power generation system 12 is divided into a first stable case and a second unstable case depending on the stability of the power generated, and a first hydrogen with a low environmental load is produced in the first stable case, and a second hydrogen with a high environmental load is produced in the second unstable case, and a hydrogen-specific production plan is created to suppress fluctuations in the amount of power input to the water electrolysis system 13. Therefore, hydrogen with different environmental loads can be appropriately produced while suppressing carbon dioxide emissions.

[0051] Furthermore, in this embodiment, when the amount of power generated by the renewable energy power generation system 12 is unstable, the amount of power stored in the power storage device 11 can be discharged and input to the water electrolysis system 13. Therefore, even when the amount of power generated by the renewable energy power generation system 12 is unstable, hydrogen can be produced with little environmental impact. [Example]

[0052] Example 2 will be described with reference to Figure 7. In this example, the differences from Example 1 will be mainly described. In this example, the hydrogen-type control unit 204 transmits a control signal to the hydrogen production device 10 in accordance with the hydrogen-type production plan created in Example 1 (S70).

[0053] This embodiment configured in this manner also provides the same effects as those of the first embodiment.

[0054] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration. Furthermore, each embodiment can be combined as appropriate unless there is an obvious contradiction. [Explanation of symbols]

[0055] 10: Hydrogen production device, 11: Power storage device, 12: Renewable energy power generation device, 13: Water electrolysis device, hydrogen storage device 14, 20: Hydrogen production control system, 201: Acquisition unit, 202: Renewable energy fluctuation prediction unit, 203: Hydrogen type production planning unit, 204: Hydrogen type control unit 204, 205: Output unit

Claims

1. A hydrogen production control system for producing hydrogen by a hydrogen production device, The hydrogen production device produces hydrogen with different environmental impacts by inputting electric energy from a renewable energy power generation device that generates electric power using renewable energy or electric energy from a power grid into a water electrolysis device to electrolyze water, a renewable energy fluctuation amount prediction unit that predicts fluctuations in the amount of power from the renewable energy power generation device; a hydrogen-type production planning unit that creates a hydrogen-type production plan for producing hydrogen with different environmental loads by the hydrogen production device according to the prediction result by the renewable energy fluctuation prediction unit, The hydrogen-type production planning unit creates a production plan for producing a first hydrogen having a low environmental load among the hydrogens having different environmental loads, using the amount of power in a first case in which the amount of power is predicted to be stably supplied from the renewable energy power generation device by the renewable energy fluctuation amount prediction unit. Hydrogen production control system.

2. Further, a hydrogen-type control unit is provided that outputs a control signal to the hydrogen production device in accordance with the hydrogen-type production plan. The hydrogen production control system according to claim 1 .

3. The hydrogen type production planning unit producing the first hydrogen using the amount of electricity predicted to be supplied from the renewable energy power generation device in the first case; Using the amount of electric power predicted to be supplied from the renewable energy power generation device in a second case other than the first case, a second hydrogen having a greater environmental load than the first hydrogen is produced. The hydrogen production control system according to claim 2 .

4. The hydrogen production device further includes a power storage device that stores the amount of electric power from the renewable energy power generation device or the amount of electric power from the power grid and inputs the stored amount of electric power to the water electrolysis device as needed. The hydrogen production control system according to claim 3 .

5. The hydrogen-type production planning unit creates the hydrogen-type production plan so as to procure an amount of power from at least one of the renewable energy power generation device, the power grid, or the power storage device so that the value of the environmental load of the second hydrogen is equal to or less than a predetermined threshold. The hydrogen production control system according to claim 4 .

6. The hydrogen-type production planning unit creates the hydrogen-type production plan so as to suppress changes in the amount of electric power input to the water electrolysis device. The hydrogen production control system according to claim 5 .

7. The hydrogen-type production planning unit creates the hydrogen-type production plan so as to suppress a change in the amount of electric power input to the water electrolysis device by adding at least one of the amount of electric power from the power grid and the amount of electric power from the power storage device to the amount of electric power from the renewable energy power generation device in the second case. The hydrogen production control system according to claim 6 .

8. A method for producing hydrogen using a hydrogen production device, comprising: The hydrogen production device produces hydrogen with different environmental impacts by inputting electric energy from a renewable energy power generation device that generates electric power using renewable energy or electric energy from a power grid into a water electrolysis device to electrolyze water, a renewable energy fluctuation prediction step of predicting fluctuations in the amount of power from the renewable energy power generation device; a hydrogen-type production planning step of creating a hydrogen-type production plan for producing hydrogen with different environmental loads by the hydrogen production device according to the prediction result by the renewable energy fluctuation prediction step, The hydrogen-type production planning step uses the amount of power in a first case in which the amount of power is predicted to be stably supplied from the renewable energy power generation device by the renewable energy fluctuation prediction step to create a production plan for producing a first hydrogen having a low environmental load among the hydrogens having different environmental loads. Hydrogen production methods.

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