Hydrogen production control apparatus, hydrogen production control method, and hydrogen production system

Abstract

To provide a hydrogen production control apparatus, a hydrogen production control method, and a hydrogen production system, in which deterioration of an electrolysis cell can be suppressed even due to power fluctuations.SOLUTION: A hydrogen production control apparatus 200 for controlling a hydrogen production in a hydrogen production system according to an embodiment of the present invention comprises: an electric source power information acquisition unit 231 for acquiring electric source power information about an electric source power value of an electric source power; an operation information acquisition unit 232 for acquiring operation information about the number of electrolytic modules operated in an operational state by receiving the module power; a source water flow rate command value calculating unit 233 for calculating a source water flow rate command value based on the electric source power information; an additional hydrogen flow rate command value calculating unit 234 for calculating an additional hydrogen flow rate command value based on the operation information; a progression control unit 240 for determining a module power supply / stop command to the electrolytic modules based on the electric source power information and the operation information; and an output unit 250.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] FIELD Embodiments of the present invention relate to a hydrogen production control device, a hydrogen production control method, and a hydrogen production system. [Background technology]

[0002] In recent years, the realization of a hydrogen energy society using hydrogen as an energy medium has attracted attention, and several hydrogen production methods have been proposed. For example, high-temperature steam electrolysis, in which high-temperature steam is electrolyzed to produce hydrogen gas and oxygen gas, is known.

[0003] When using electricity generated by renewable energy, studies are being conducted on how to adapt electrolysis to fluctuations in power supply. For example, there is an example of water electrolysis, which is not high-temperature steam electrolysis. In this example, from multiple electrolytic cells connected in series or parallel, an electrolytic cell to operate is selected according to the power supply, and the supply of raw water to unnecessary electrolytic cells is stopped. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7110042 [Patent Document 2] Patent No. 4406866 Summary of the Invention [Problem to be solved by the invention]

[0005] When using renewable energy sources with unstable power supplies, such as solar and wind power, it is desirable to quickly utilize the electricity generated by the renewable energy source. In other words, it is important to ensure the responsiveness of the hydrogen production system to power fluctuations.

[0006] When electricity is generated from renewable energy sources, it is effective to keep the electrolytic cell in a high-temperature standby state in order to rapidly produce hydrogen. To keep the electrolytic cell in a high-temperature standby state, it is necessary to supply water vapor, which is the raw material, to the electrolytic cell in a high-temperature state.

[0007] On the other hand, when water vapor as a raw material is supplied to an electrolytic cell that is not performing electrolysis, there is a problem in that the hydrogen electrode side of the cell is exposed to an oxidizing atmosphere and deteriorates due to oxidation.

[0008] During hydrogen production by electrolysis, the hydrogen electrode side of the electrolytic cell is in a reducing atmosphere, and therefore the hydrogen electrode side of the electrolytic cell is reduced. However, if oxidation of the hydrogen electrode side of the electrolytic cell progresses during the standby period, the deteriorated performance of the electrolytic cell cannot be fully restored even if the hydrogen electrode side of the cell is in a reducing atmosphere during hydrogen production.

[0009] The problem to be solved by the present invention is to provide a hydrogen production control device, a hydrogen production control method, and a hydrogen production system that can suppress deterioration of an electrolysis cell while ensuring responsiveness to fluctuations in power. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the hydrogen production control device according to this embodiment is a hydrogen production control device that controls hydrogen production in a hydrogen production system that includes a power supply system having a DC power supply device and a plurality of module power supplies that receive supply power from the DC power supply device, a plurality of electrolysis modules that each receive supply of module power from the module power supply and electrolyze water vapor into hydrogen, a water vapor system that supplies the water vapor to the plurality of electrolysis modules using supplied raw water, an added hydrogen supply unit that supplies added hydrogen to the water vapor, a raw water flow regulator that receives a raw water flow rate command value for adjusting the flow rate of the raw water and adjusts the flow rate of the raw water, and an added hydrogen flow regulator that receives an added hydrogen flow rate command value for adjusting the flow rate of the added hydrogen, and the hydrogen production control device controls hydrogen production in a hydrogen production system that includes a power supply power information acquisition unit that acquires power supply power information related to the power supply power value of the power supply power, and a plurality of electrolysis modules that receive module power from the module power supply and electrolyze water vapor into hydrogen. a raw water flow rate command value calculation unit that calculates the raw water flow rate command value based on the power source power information; an added hydrogen flow rate command value calculation unit that calculates the added hydrogen flow rate command value based on the operating information; a progress control unit that determines a module power supply / stop command regarding supply and stop of the module power to each of the plurality of electrolysis modules based on the power source power information and the operating information; and an output unit that outputs the raw water flow rate command value calculated by the raw water flow rate command value calculation unit to the raw water flow rate regulator, outputs the added hydrogen flow rate command value calculated by the added hydrogen flow rate command value calculation unit to the added hydrogen flow rate regulator, and outputs the module power supply / stop command determined by the progress control unit to the power supply system. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a system diagram showing the configuration of a hydrogen production system according to an embodiment. [Figure 2] 1 is a block diagram showing the configuration of an electrolysis device of a hydrogen production system according to an embodiment. FIG. [Figure 3] 1 is a block diagram showing the configuration of a hydrogen production control device according to an embodiment. [Figure 4] 10 is a graph showing an example of steam flow rate versus power supply power characteristics stored in a steam flow rate characteristics storage unit of the hydrogen production control device according to the embodiment. [Figure 5] 10 is a graph showing an example of characteristics of added hydrogen concentration versus number of operating units stored in a hydrogen concentration characteristics storage unit of the hydrogen production control device according to the embodiment. [Figure 6] FIG. 2 is a flowchart showing the procedure of a hydrogen production control method according to an embodiment. [Figure 7] 4 is a flowchart showing a procedure for determining a module power supply / stop command in the hydrogen production control method according to the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a hydrogen production control device, a hydrogen production control method, and a hydrogen production system according to embodiments of the present invention will be described with reference to the drawings. Hereinafter, identical or similar parts will be denoted by common reference numerals, and overlapping descriptions will be omitted.

[0013] FIG. 1 is a system diagram showing the configuration of a hydrogen production system 100 according to an embodiment.

[0014] The hydrogen production system 100 includes an electrolysis device 110 , a power supply system 120 , a steam system 130 , an added hydrogen supply unit 140 , an air system 150 , a product recovery unit 160 , and a hydrogen production control device 200 .

[0015] The electrolysis device 110 receives a supply of electric power and electrolyzes water vapor into hydrogen and oxygen. The electrolysis device 110 has a plurality of electrolysis modules 111. The electrolysis module 111 is a collective term for a first electrolysis module 111a, a second electrolysis module 111b, and a third electrolysis module 111c. Each electrolysis module 111 is configured by connecting a plurality of electrolysis cell stacks 115 ( FIG. 2 ), each of which is made up of a plurality of solid oxide electrolysis cells (SOECs). Details will be described later with reference to FIG. 2.

[0016] The first electrolysis module 111a, the second electrolysis module 111b, and the third electrolysis module 111c are housed in a heating container 112 so that they are maintained at a high temperature of approximately 500°C to 800°C. The heating method for the heating container 112 is not limited, but an electric heating method is preferred.

[0017] The power supply system 120 includes a DC power supply device 121, an electrolysis module power supply 122, an electrolysis module power supply ON / OFF unit 123, and an electrolysis module power supply connection line 124.

[0018] The DC power supply 121 supplies DC power to the electrolysis module power supplies 122. Here, the total power supplied by the DC power supply 121 to the electrolysis module power supplies 122 will be referred to as the source power. The value of the source power will be referred to as the source power value. The total current supplied by the DC power supply 121 to the electrolysis module power supplies 122 will be referred to as the source current, and the value of the source current will be referred to as the source current value. In other words, the source power value and the source current value are the sums of the power values ​​and current values ​​supplied to each electrolysis module power supply 122, respectively.

[0019] The DC power supply 121 is, for example, a renewable energy power supply that uses solar or wind power. The following description will be given taking as an example a case where the DC power supply 121 is such a renewable energy power supply. Note that the DC power supply 121 is not limited to a renewable energy power supply. For example, the DC power supply 121 may be a device that receives power from a commercial AC power supply or industrial power generation equipment as an AC power supply and supplies DC power by AC-DC conversion. Alternatively, the DC power supply 121 may be a storage battery, or may partially include a storage battery.

[0020] The electrolysis module power supply 122 is a collective term for a first electrolysis module power supply 122a, a second electrolysis module power supply 122b, and a third electrolysis module power supply 122c. The electrolysis module power supply ON / OFF unit 123 is a collective term for a first electrolysis module power supply ON / OFF unit 123a, a second electrolysis module power supply ON / OFF unit 123b, and a third electrolysis module power supply ON / OFF unit 123c. The electrolysis module power supply connection line 124 is a collective term for a first electrolysis module power supply connection line 124a, a second electrolysis module power supply connection line 124b, and a third electrolysis module power supply connection line 124c.

[0021] Each of the electrolysis module power supplies 122, i.e., the first electrolysis module power supply 122a, the second electrolysis module power supply 122b, and the third electrolysis module power supply 122c, receives module power from a DC power supply 121. The sum of the module powers is the power supply power. The current corresponding to the module power is called the module current. The value of the module current is called the module current value. The sum of the module current and the module current value is the power supply current and the power supply current value, respectively.

[0022] The first electrolysis module power supply on / off unit 123a is provided on the first electrolysis module power supply connection line 124a, which is the supply path for module power from the first electrolysis module power supply 122a to the first electrolysis module 111a. The first electrolysis module power supply on / off unit 123a is capable of starting and stopping the supply of module power from the first electrolysis module power supply 122a to the first electrolysis module 111a. The same applies to the second electrolysis module power supply on / off unit 123b, which is capable of starting and stopping the supply of module power from the second electrolysis module power supply 122b to the second electrolysis module 111b. The same applies to the third electrolysis module power supply on / off unit 123c, which is capable of starting and stopping the supply of module power from the third electrolysis module power supply 122c to the third electrolysis module 111c.

[0023] The electrolysis module power on / off units 123, i.e., the first electrolysis module power on / off unit 123a, the second electrolysis module power on / off unit 123b, and the third electrolysis module power on / off unit 123c, each perform an opening and closing operation in accordance with commands sent from the hydrogen production control device 200 to the power supply system 120.

[0024] When a certain electrolysis module power on / off unit 123 is in the closed state and module power is being supplied to the corresponding electrolysis module 111, the electrolysis module 111 is said to be in an operating state. When a certain electrolysis module power on / off unit 123 is in the open state and the supply of module power to the corresponding electrolysis module 111 is stopped, the operation of the electrolysis module 111 is said to be stopped or has been stopped. When the supply of module power to a certain electrolysis module 111 is stopped, the electrolysis module 111 is said to be in a standby state. In other words, after the operation of the electrolysis module 111 is stopped, the electrolysis module 111 is in a standby state.

[0025] 1 shows a case where the electrolysis modules 111, the electrolysis module power supplies 122, and the electrolysis module power supply ON / OFF units 123 are each configured in three sets, but this is not limiting. That is, these may be configured in any number other than three sets as long as there are multiple sets.

[0026] The steam system 130 includes a raw water supply pipe 131 , a raw water flow regulator 132 , a steam generator 133 , a raw gas supply pipe 134 , a steam system regenerative heat exchanger 135 , and a steam system return pipe 136 .

[0027] The upstream side of the raw water supply pipe 131 is connected to a raw water source (not shown) such as a pure water tank, and serves as a path for conducting raw water to the electrolysis device 110. If a driving force for water supply is required due to low pressure on the water source side, a driving means such as a pump (not shown) may be provided as necessary.

[0028] The raw water flow rate regulator 132 has a flow rate adjustment means, such as a control valve (not shown), and is capable of adjusting the flow rate of raw water. The raw water flow rate regulator 132 adjusts the flow rate of raw water so that it follows a raw water flow rate command value, which is a command value from the hydrogen production control device 200. Here, the raw water flow rate command value is a target value used by the raw water flow rate regulator 132 to adjust the raw water flow rate. FIG. 1 illustrates a case in which a raw water flow rate signal from the raw water flow meter 131a is input to the raw water flow rate regulator 132 as a feedback signal. Note that the raw water flow rate regulator 132 may also adjust the raw water flow rate based only on the raw water flow rate command value, without using any feedback, i.e., without using the raw water flow rate signal.

[0029] The steam generator 133 heats the raw water and converts it into steam.

[0030] The raw material gas supply pipe 134 is a path for supplying the raw material gas to the electrolysis device 110. Here, the raw material gas is a mixed gas of steam generated in the steam generator 133 and additional hydrogen added to the steam. A raw material gas pressure gauge 134a is provided at the inlet of the raw material gas supply pipe 134 to the electrolysis device 110 for control by the air system 150, which will be described later.

[0031] The steam system regenerative heat exchanger 135 is installed in the raw water supply pipe 131. The steam system regenerative heat exchanger 135 exchanges heat between the steam supplied to the electrolysis device 110 and the fluid in the steam system return pipe 136 returning from the electrolysis device 110, and recovers part of the heat of the returning fluid. Here, the returning fluid includes unelectrolyzed steam, water condensed from this, and hydrogen produced by electrolysis.

[0032] The added hydrogen supply unit 140 has an added hydrogen supply pipe 141 and an added hydrogen flow rate regulator 142 provided on the added hydrogen supply pipe 141 .

[0033] The added hydrogen supply pipe 141 is a supply path for added hydrogen that is added to steam in order to adjust the hydrogen concentration in the steam that is supplied to the electrolysis device 110 side by the raw material gas supply pipe 134. The added hydrogen supply pipe 141 is connected to a hydrogen source (not shown) such as a hydrogen cylinder on the upstream side, and is connected to the raw material water supply pipe 131 on the downstream side of the added hydrogen flow regulator 142. The raw material gas supply pipe 134 introduces raw material gas from the junction of the added hydrogen supply pipe 141 and the raw material water supply pipe 131 to the electrolysis device 110. Here, the raw material gas is a mixed gas of steam and added hydrogen.

[0034] The added hydrogen flow rate regulator 142 has a flow rate adjustment means, such as a control valve (not shown), and is capable of adjusting the flow rate of added hydrogen. The added hydrogen flow rate regulator 142 adjusts the flow rate of added hydrogen so that it follows an added hydrogen flow rate command value, which is a command value from the hydrogen production control device 200. Here, the added hydrogen flow rate command value is a target value for the added hydrogen flow rate regulator 142 to adjust the added hydrogen flow rate. FIG. 1 shows an example in which an added hydrogen flow rate signal from the added hydrogen flow meter 141a is input to the added hydrogen flow rate regulator 142 as a feedback signal. Note that the added hydrogen flow rate regulator 142 may also adjust the added hydrogen flow rate based only on the added hydrogen flow rate command value, without feedback using the added hydrogen flow rate signal.

[0035] The product recovery section 160 includes a hydrogen / steam separator 161 and a product recovery pipe 162. The hydrogen / steam separator 161 is provided downstream of the steam system regenerative heat exchanger 135 in the steam system return pipe 136. The hydrogen / steam separator 161 separates hydrogen from a mixture of hydrogen produced in the electrolysis device 110 and unconsumed steam. The product recovery pipe 162 guides the separated hydrogen to a recovery section (not shown) for recovery.

[0036] The air system 150 functions as a purge gas system that discharges oxygen generated by electrolysis at the oxygen electrode of the electrolysis module 111 from the electrolysis device 110. The purge gas is preferably a gas containing oxygen, more preferably air. Figure 1 illustrates an example in which air is used as the purge gas.

[0037] The air system 150 includes an air supply pipe 151 , an air flow regulator 152 , an air system regenerative heat exchanger 153 , and an air discharge pipe 154 .

[0038] The air supply pipe 151 guides air from an external air source or an air cylinder or other such source to the electrolysis device 110. At the inlet of the air supply pipe 151 to the electrolysis device 110, a purge gas pressure gauge 151a is provided.

[0039] The air flow regulator 152 has a flow rate adjusting means such as a control valve (not shown) and is capable of adjusting the air flow rate. The air flow regulator 152 adjusts the air flow rate so that the mass flow rate of air supplied to the electrolysis device 110 is proportional to the mass flow rate of water vapor supplied to the electrolysis device 110.

[0040] The air flow regulator 152 obtains the water vapor flow rate as a target value and adjusts the air flow rate, which is a purge gas, to follow this. The air flow regulator 152 obtains a raw water flow rate command value from the hydrogen production control device 200 and treats this as the water vapor flow rate as a target value. The air flow regulator 152 also calculates the differential pressure between the purge gas pressure measured by the purge gas pressure gauge 151a and the water vapor pressure measured by the raw gas pressure gauge 134a. Based on this differential pressure, the air flow regulator 152 adjusts the air flow rate by, for example, adjusting the aperture of a control valve so that the air flow rate is proportional to the target value.

[0041] The air system regenerative heat exchanger 153 is installed in the air supply pipe 151. The air system regenerative heat exchanger 153 exchanges heat between the air supplied to the electrolysis device 110 through the air supply pipe 151 and the exhaust air containing oxygen that is exhausted from the electrolysis device 110 side through the air exhaust pipe 154. This heat exchange recovers part of the heat of the exhaust air. The air exhaust pipe 154 discharges the exhaust air from the air system regenerative heat exchanger 153 to the outside of the system.

[0042] FIG. 2 is a block diagram showing the configuration of the electrolysis device 110 of the hydrogen production system 100 according to this embodiment.

[0043] Figure 2 shows the relationship between the multiple electrolysis cell stacks 115 and the water vapor side and power supply system 120. Figure 2 also shows the relationship between the multiple electrolysis cell stacks 115 and each electrolysis module 111. The reference numerals of the electrolysis cell stacks 115 only indicate the area of ​​the first electrolysis module 111a, and omit the areas of the second electrolysis module 111b and the third electrolysis module 111c.

[0044] Each electrolysis cell stack 115 includes stacked solid oxide electrolysis cells (SOECs).

[0045] Steam, which is a raw material for electrolysis in the electrolysis device 110, is mixed with added hydrogen to form a raw material gas, which is supplied to the electrolysis device 110 via a raw material gas supply pipe 134. In addition, a mixed gas of hydrogen and unelectrolyzed steam generated in the electrolysis device 110 is discharged from the electrolysis device 110 to a steam system return pipe 136.

[0046] The steam piping inside the electrolysis device 110 between the raw material gas supply piping 134 and the steam system return pipe 136 is referred to as the electrolysis device internal piping 137. When viewed from the side of the electrolysis device internal piping 137, the multiple electrolysis cell stacks 115 are connected as follows:

[0047] That is, the electrolysis device internal piping 137 has six headers: a first header 137a, a second header 137b, a third header 137c, a fourth header 137d, a fifth header 137e, and a sixth header 137f.

[0048] The first header 137a, the third header 137c, and the fifth header 137e are headers on the raw material gas supply side connected to the raw material gas supply pipe 134. The second header 137b, the fourth header 137d, and the sixth header 137f are headers on the product discharge side connected to the steam system return pipe 136. The headers on the product discharge side are headers on the discharge side for a mixed gas of hydrogen and unelectrolyzed steam.

[0049] Six electrolysis cell stacks 115 are arranged in parallel between the first header 137a and the second header 137b. Six electrolysis cell stacks 115 are also arranged in parallel between the third header 137c and the fourth header 137d. Six electrolysis cell stacks 115 are also arranged in parallel between the fifth header 137e and the sixth header 137f.

[0050] In this way, there are three sets of six electrolysis cell stacks 115 arranged in parallel between the header on the raw material gas supply side and the header on the product discharge side, and these three sets are also connected in parallel with each other.

[0051] The electrolytic cell stacks 115 are connected in parallel to the header on the raw material gas supply side and the header on the product discharge side, so that the flow rate of the raw material gas supplied to the electrolytic cell stacks 115 is evenly distributed. A means for evenly supplying gas to each electrolytic cell stack 115 may be provided. One such means is, for example, providing an orifice in the piping on the inlet or outlet side of each electrolytic cell stack 115 in the piping 137 within the electrolysis apparatus.

[0052] Meanwhile, when viewed from the perspective of the three electrolysis module power supplies 122, the electrolysis module power supply ON / OFF unit 123, and the electrolysis module power supply connection lines 124 of the power supply system 120, the multiple electrolysis cell stacks 115 are connected as follows:

[0053] That is, first, in each of the three groups, the six electrolysis cell stacks 115 arranged in parallel are divided into three groups, two for each group. Two of the electrolysis cell stacks 115 in each group selected in this way, i.e., a total of six electrolysis cell stacks 115 across the three groups, are associated with one electrolysis module 111. In this way, the six electrolysis cell stacks 115 are associated with three electrolysis modules 111, namely, the first electrolysis module 111a, the second electrolysis module 111b, and the third electrolysis module 111c.

[0054] The six electrolysis cell stacks 115 of each electrolysis module 111 are electrically connected in series via the corresponding electrolysis module power supply connection lines 124. For example, the six electrolysis cell stacks 115 of the first electrolysis module 111a are electrically connected in series via the first electrolysis module power supply connection line 124a. In detail, first, two electrolysis cell stacks 115 of each set are connected in series, and then three sets are connected in series. The same applies to the second electrolysis module 111b and the third electrolysis module 111c.

[0055] FIG. 3 is a block diagram showing the configuration of a hydrogen production control device 200 according to an embodiment.

[0056] The hydrogen production control device 200 has an input unit 210, a memory unit 220, a calculation unit 230, a progress control unit 240, and an output unit 250. Here, the hydrogen production control device 200 is, for example, a computer system. Alternatively, the hydrogen production control device 200 may be a collection of individual devices. For example, the progress control unit 240 may be a control device such as a PLC (Programmable Logic Controller). Furthermore, the input unit 210 and the output unit 250 may be in a form including a device capable of bidirectional information transmission, such as an HMI (Human Machine Interface).

[0057] The input unit 210 receives external inputs such as information relating to the steam flow rate versus power source power characteristics and information relating to the added hydrogen concentration versus the number of operating units characteristics, designation of the control method at the start of operation, and control parameters, which will be described later.

[0058] The storage unit 220 includes a water vapor flow rate characteristics storage unit 221 , a hydrogen concentration characteristics storage unit 222 , and a calculation result storage unit 223 .

[0059] The water vapor flow rate characteristic storage unit 221 stores information about the water vapor flow rate versus power supply power characteristic, which will be described later, received by the input unit 210. The water vapor flow rate versus power supply power characteristic may be stored in a table format or a function format.

[0060] The hydrogen concentration characteristic storage unit 222 stores information about the added hydrogen concentration versus number of operating units characteristic, which will be described later, received by the input unit 210. The added hydrogen concentration versus number of operating units characteristic may be stored in a table format or a function format.

[0061] The calculation result storage unit 223 stores the calculation results of the calculation unit 230.

[0062] The calculation unit 230 includes a power supply power information acquisition unit 231 , an operation information acquisition unit 232 , a raw water flow rate command value calculation unit 233 , and an added hydrogen flow rate command value calculation unit 234 .

[0063] The source power information acquisition unit 231 acquires source power information relating to the value of source power (source power value) supplied from the DC power supply device 121 to the entire electrolysis module power supply 122. The source power information is information relating to the current value of the source power value. The source power information may also include information relating to the time change of the source power value at each point in time after the current point in time.

[0064] Here, if the DC power supply device 121 is provided with a voltmeter and an ammeter, the source power information acquisition unit 231 acquires the voltage value and current value from these and calculates the source power value. If the DC power supply device 121 is not provided with a voltmeter or an ammeter, the source power information acquisition unit 231 estimates and predicts the source power value from the present onwards.

[0065] For example, when the DC power supply device 121 is a renewable energy power supply using solar or wind power, the power supply power information acquisition unit 231 estimates and predicts the power supply power value by the following method.

[0066] The power supply power information acquisition unit 231 has a database of power forecast information including weather forecasts and actual data for estimating and predicting power supply power values. The database of power forecast information is information including daily changes in generated power using parameters such as seasons and weather forecast patterns. The power supply power information acquisition unit 231 compares reliable weather forecast information with the power forecast information in this database to estimate and predict power supply values. The estimated and predicted power supply values ​​can be revised every time the weather forecast information is updated or at regular intervals.

[0067] The operation information acquisition unit 232 acquires operation information related to the electrolysis modules 111. Here, the operation information is information about which electrolysis modules 111 are in operation and which electrolysis modules 111 are in standby. As a result, the operation information also includes the number of operating electrolysis modules 111. For this purpose, the operation information acquisition unit 232 acquires on / off information from each of the electrolysis module power on / off units 123 to obtain operation information related to the electrolysis modules 111. Alternatively, the operation information acquisition unit 232 may obtain operation information related to the electrolysis modules 111 from history information of module power supply / stop commands to the electrolysis modules 111 issued by the progress control unit 240, which will be described later.

[0068] The raw water flow rate command value calculation unit 233 calculates the raw water flow rate command value based on the power source power value acquired by the power source power information acquisition unit 231 and the steam flow rate versus power source power characteristics stored in the steam flow rate characteristic memory unit 221.

[0069] The added hydrogen flow rate command value calculation unit 234 derives the required flow rate of added hydrogen to be supplied to the electrolysis device 110 based on the characteristics of added hydrogen concentration versus the number of operating units stored in the hydrogen concentration characteristics storage unit 222 .

[0070] The progress control unit 240 issues execution commands to each element of the hydrogen production control device 200 based on a predetermined order in the hydrogen production control device 200. The progress control unit 240 also manages the operation and shutdown of each of the electrolysis modules 111, i.e., the first electrolysis module 111a, the second electrolysis module 111b, and the third electrolysis module 111c.

[0071] To this end, the progress control unit 240 first calculates the total current value supplied from the DC power supply device 121 to the electrolysis module power supply 122 and the module current value per electrolysis module 111 in operation. Specifically, the progress control unit 240 calculates the total current value and the module current value based on the source power value acquired by the source power information acquisition unit 231 and the operation information acquired by the operation information acquisition unit 232. That is, the progress control unit 240 calculates the total current value by dividing the source power value by the voltage value. Furthermore, the progress control unit 240 calculates the module current, i.e., the current value per electrolysis module 111, by dividing the total current value by the number of electrolysis modules 111 in operation. Note that a nominal value may be used as the DC voltage value in this case. Alternatively, a DC voltage value read as external data by the input unit 210 may be used as the DC voltage value.

[0072] The progress control unit 240 stores the upper and lower limit values ​​of the module current. These upper and lower limit values ​​may be read by the input unit 210 as external data. The progress control unit 240 compares the calculated module current with the upper and lower limit values ​​of the module current and determines whether the current matches the upper and lower limit values. The progress control unit 240 determines a module power supply / stop command according to the results of this comparison and determination. The determined module power supply / stop command is output to the power supply system 120 via the output unit 250.

[0073] 4 is a graph showing an example of the steam flow rate versus power supply power characteristics stored in the steam flow rate characteristics storage unit 221 of the hydrogen production control device 200 according to the embodiment. The horizontal axis represents the power supply power value [W], and the vertical axis represents the required steam flow rate [kg / h].

[0074] The flow rate of water vapor as a raw material to be supplied to the electrolysis device 110 is proportional to the current of the power supply supplied to the electrolysis device 110. The straight line A0 shown in FIG. 4 represents the characteristics when the voltage of the power supply is standard. The straight lines A1 and A2 represent the cases when the voltage of the power supply changes. When the voltage is high, the current value decreases and the amount of electrolysis also decreases, so the line A1 side, where the required water vapor flow rate is small, is used. Conversely, when the voltage is low, the current value increases and the amount of electrolysis increases, so the line A2 side, where the required water vapor flow rate is large, is used. Note that when the voltage of the power supply does not change significantly, the line A0 may be used as the standard characteristics.

[0075] Instead of the characteristics shown in FIG. 4, a characteristic in which the horizontal axis represents the power supply current value [A] and the vertical axis represents the required water vapor flow rate [kg / h] may be stored in the water vapor flow rate characteristic storage unit 221 as the water vapor flow rate versus power supply current characteristic.

[0076] 5 is a graph showing an example of the characteristics of the added hydrogen concentration versus the number of operating units stored in the hydrogen concentration characteristics storage unit 222 of the hydrogen production control device 200 according to the embodiment. The horizontal axis represents the number of operating electrolysis modules 111, and the vertical axis represents the required added hydrogen concentration C H [wt%]. Added hydrogen concentration C H [wt%] is the hydrogen concentration [wt%] in the raw material gas. At this time, the water vapor concentration in the raw material gas is (100-C H ) [wt%].

[0077] As shown in Figure 5, when the number of operating units is 0, i.e., when all units are on standby, the required concentration of added hydrogen is C HO In the case of the number of operating units 1 and 2, the required concentration of added hydrogen is C HM [wt%]. One or two-unit operation refers to a state in which both the electrolysis module 111 in operation and the electrolysis module 111 in standby are present. In addition, when the number of operating units is three, that is, when all units are in operation, the required concentration of added hydrogen is C HT [wt%].

[0078] As shown in Figure 5, CHO [wt%]>C HM [wt%]>C HT In other words, the fewer the number of operating electrolysis modules 111, that is, the more the number of standby electrolysis modules 111 increases, the lower the required added hydrogen concentration C H [wt%] increases.

[0079] When at least one electrolysis module 111 is in standby, the required added hydrogen concentration C HO and C HM is preferably in the range of 30 wt% or more and 90 wt% or less. That is, the required water vapor concentration is preferably in the range of 10 to 70 wt%. Here, the added hydrogen concentration C HO and C HM If the added hydrogen concentration C is less than 30 wt%, deterioration of the electrolysis module 111 not performing electrolysis is accelerated compared to the electrolysis module 111 performing electrolysis. HO and C HM If the ratio exceeds 70 wt %, the impact on deterioration of the electrolysis cell stack 115 and the electrolysis module 111 is small, but the energy consumption for producing hydrogen becomes excessively large because an excess amount of hydrogen is supplied.

[0080] In addition, when all units are in operation, the required added hydrogen concentration C HT Although it depends on the operating temperature, it is preferable that the concentration of added hydrogen C is in the range of 5 wt% or more and 10 wt% or less. In other words, the required water vapor concentration is preferably in the range of 90 to 95 wt%. HO and C HM If the hydrogen concentration is less than 5 wt%, the electrolysis cell will oxidize, accelerating the deterioration of the electrolysis cell stack 115 and the electrolysis module 111. Furthermore, if a leak or the like occurs inside the electrolysis cell stack 115 or the electrolysis module 111, a malfunction will occur. That is, in such a case, the supplied hydrogen will be consumed by the leak, making it impossible to supply a sufficient amount of hydrogen to the electrolysis cell, leading to cell deterioration. For this reason, the hydrogen concentration is preferably 10 wt% or less.

[0081] FIG. 6 is a flowchart showing the procedure of the hydrogen production control method according to the embodiment.

[0082] First, the source power information acquisition unit 231 acquires source power information relating to the source power value supplied from the DC power supply device 121 to the entire electrolysis module power supply 122 (step S01).

[0083] Next, the raw water flow rate command value calculation unit 233 calculates the raw water flow rate command value based on the power source power value acquired by the power source power information acquisition unit 231 and the steam flow rate versus power source power characteristic stored in the steam flow rate characteristic memory unit 221 (step S02).

[0084] Specifically, the raw water flow rate command value calculation unit 233 calculates the raw water flow rate command value in the following procedure. First, the raw water flow rate command value calculation unit 233 sets the value on the horizontal axis in the steam flow rate vs. power supply power characteristic shown in Fig. 4 to the power supply power value acquired by the power supply power information acquisition unit 231. Next, the raw water flow rate command value calculation unit 233 obtains the required steam flow rate [kg / h] using the characteristic of the line A0 in Fig. 4, and further obtains the steam flow rate G S (kg / hr). This value is also the required raw water flow rate. Therefore, the raw water flow rate command value calculation unit 233 converts this steam flow rate G S (kg / hr) is used as the raw water flow command value G WD Output as

[0085] In addition, when the voltage value of the power supply varies significantly, the raw water flow rate command value calculation unit 233 obtains the required steam flow rate [kg / h] by interpolation or extrapolation using the straight lines A1, A2, etc. in FIG. 4, and calculates the steam flow rate G S (kg / hr) may also be calculated.

[0086] The raw water flow rate command value calculated by the raw water flow rate command value calculation unit 233 is output from the output unit 250 to the raw water flow rate regulator 132 (step S03).

[0087] In this way, the hydrogen production control device 200 supplies the source gas at a flow rate that corresponds to the power supply power without isolating the electrolysis module 111 that is in a standby state and not receiving module power. This allows the standby electrolysis module 111 to maintain a high-temperature standby state. As a result, responsiveness to power fluctuations can be ensured.

[0088] In parallel with steps S01 to S03, the operation information acquisition unit 232 acquires operation information related to the electrolysis modules 111 (step S04). The operation information includes information on which electrolysis modules 111 are in operation and which electrolysis modules 111 are in standby.

[0089] Next, the added hydrogen flow rate command value calculation unit 234 calculates an added hydrogen flow rate command value as the required flow rate of added hydrogen to be supplied to the electrolysis device 110 based on the added hydrogen concentration versus number of operating units characteristics stored in the hydrogen concentration characteristics storage unit 222 (step S05).

[0090] Specifically, the added hydrogen flow rate command value calculation unit 234 calculates the added hydrogen flow rate command value in the following procedure: First, the added hydrogen flow rate command value calculation unit 234 calculates the required added hydrogen concentration C H Next, the added hydrogen flow rate command value calculation unit 234 calculates the steam flow rate G S (kg / hr) and the hydrogen addition flow rate command value G HD Calculate (kg / hr).

[0091] G HD =[C H / (1-C H )]·G W ···(1)

[0092] The added hydrogen flow rate command value calculated by the added hydrogen flow rate command value calculation unit 234 is output from the output unit 250 to the added hydrogen flow rate regulator 142 (step S06).

[0093] As described above, in the hydrogen production system 100, a raw material gas, which is a mixed gas of water vapor and added hydrogen, is supplied to the electrolysis modules 111 of the electrolysis device 110. The hydrogen production control device 200 changes the concentration of added hydrogen in the raw material gas depending on the operating state of the electrolysis device 110. Here, the operating state may be a state in which all of the electrolysis modules 111 are in a standby state, a state in which some electrolysis modules 111 are in a standby state and some are in an operating state, or a state in which all of the electrolysis modules 111 are in an operating state. This allows the hydrogen production control device 200 to appropriately ensure reducing atmosphere conditions throughout the entire electrolysis device 110.

[0094] After steps S01 and S04, the progress control unit 240 determines a module power supply / stop command based on the power source power information acquired by the power source power information acquisition unit 231 and the operation information acquired by the operation information acquisition unit 232 (step S07). Specifically, the progress control unit 240 determines a power supply command or a power supply stop command for each of the first electrolysis module 111a, the second electrolysis module 111b, and the third electrolysis module 111c via the output unit 250. The determined module power supply / stop commands are output from the output unit 250 to the power supply system 120 (step S08).

[0095] In this way, the hydrogen production control device 200 monitors the module current of the electrolysis modules 111 in operation and switches the number of operating electrolysis modules 111 so that the module current is within a predetermined range. Here, the predetermined range is a range of module current that is equal to or greater than the lower limit and equal to or less than the upper limit. This enables the hydrogen production control device 200 to operate in accordance with changes in the power supply.

[0096] After steps S02, S05, and S07, the progress control unit 240 determines whether or not to shut down the hydrogen production system 100 (step S09). This determination is made by the progress control unit 240 determining whether or not an operator, such as an operations manager, has input a shutdown command via the input unit 210. If the progress control unit 240 determines not to shut down the hydrogen production system 100 (step S09: NO), it repeats steps S01 and S04 and the following steps. If the progress control unit 240 determines to shut down the hydrogen production system 100 (step S09: YES), it stops control (step S10).

[0097] Fig. 7 is a flowchart showing the procedure for determining a module power supply / stop command in the hydrogen production control method according to the embodiment. Fig. 7 is a flowchart showing details of step S05 in the flowchart shown in Fig. 6. Each step will be explained in order below.

[0098] First, the input unit 210 reads the control method designation (step S11).

[0099] Next, the progress control unit 240 checks the control method read by the input unit 210 (step S12). Figure 7 illustrates examples of control methods: unit count control and total operation control. Here, unit count control is a control method in which the number of operating electrolysis modules 111 is changed depending on the value of the power supply power. Meanwhile, total operation control is a control method in which the number of operating units is fixed at the total number.

[0100] If the progress control unit 240 confirms in step S12 that the number of vehicles is to be controlled, it selects the number of vehicles control (step S21).

[0101] Next, the progress control unit 240 determines the number of electrolysis modules 111 in operation (step S22). Specifically, the progress control unit 240 first obtains a quotient by dividing the total current value calculated by the progress control unit 240 itself by the upper limit value of the module current. The progress control unit 240 rounds up the quotient to the nearest whole number, and sets the result as the number of electrolysis modules in operation. If the quotient has no decimal places, the progress control unit 240 adds 1 to the quotient and sets the result as the number of electrolysis modules in operation.

[0102] Next, the progress control unit 240 determines whether the module current value has reached an upper limit value (step S23). Here, the module current value is a value obtained by dividing the total current value by the number of electrolysis modules 111 in operation.

[0103] If it is determined in step S23 that the module current has not reached the upper limit value (NO in step S23), the progress control unit 240 determines whether the module current has reached the lower limit value (step S24).

[0104] If the progress control unit 240 determines in step S24 that the module current has not reached the lower limit value (NO in step S24), it repeats step S24 and subsequent steps.

[0105] If it is determined in step S24 that the module current has reached the lower limit value (YES in step S24), the progress control unit 240 determines whether a plurality of electrolysis modules 111 are in operation (step S25).

[0106] If the progress control unit 240 determines in step S25 that there is a plurality of operating electrolysis modules 111 (step S25: YES), it reduces the number of operating electrolysis modules 111 by one (step S26) and repeats step S24 and the following steps.

[0107] If the progress control unit 240 determines in step S25 that there is not more than one operating electrolysis module 111 (step S25 NO), it stops the electrolysis module 111 and transitions to control of putting all of the electrolysis modules 111 on standby (step S27).

[0108] On the other hand, if the progress control unit 240 determines in step S23 that the module current has reached the upper limit (YES in step S23), it determines whether or not there is a standby electrolysis module 111 (step S28).

[0109] If the progress control unit 240 determines in step S28 that there is no standby electrolysis module 111 (NO in step S28), it repeats step S23 and subsequent steps.

[0110] If it is determined in step S28 that there is a standby electrolysis module 111 (YES in step S28), the progress control unit 240 determines whether there is one standby module (step S29).

[0111] If the progress control unit 240 determines in step S29 that there is more than one waiting machine (step S29 NO), that is, if it determines that there are multiple waiting machines, it starts up one of the waiting machines (step S30) and repeats the steps from step S23 onwards.

[0112] If the progress control unit 240 determines in step S29 that there is one standby machine (YES in step S29), it starts up the standby machine and shifts to full operation control (step S40).

[0113] Step S40 is also a step in which the progress control unit 240 selects the full control method if the progress control unit 240 confirms in step S12 that the control method is specified as the full control method.

[0114] Among the steps described above, the steps at which a module power supply / stop command is issued are indicated as "Go to S08" in Fig. 7. The relevant steps are steps S22, S26, S27, S30, and S40. In step S08, as described above, the module power supply / stop command is output from output unit 250 to power supply system 120.

[0115] The hydrogen production control device 200 and the hydrogen production control method in the hydrogen production system 100 according to the present embodiment described above have the following main features.

[0116] The hydrogen production control device 200 and the hydrogen production control method perform the following controls, and provide the following effects.

[0117] (1) The hydrogen production control device 200 monitors the module current of the electrolysis modules 111 in operation and switches the number of operating electrolysis modules 111 so that the module current is within a predetermined range. Here, the predetermined range is a range of module current that is equal to or greater than the lower limit and equal to or less than the upper limit. This enables the hydrogen production control device 200 to operate in accordance with changes in the power supply.

[0118] (2) The hydrogen production control device 200 supplies source gas to the electrolysis module 111 in a standby state where no module power is being supplied, without isolating the electrolysis module 111. This allows the standby electrolysis module 111 to maintain a high-temperature standby state. As a result, responsiveness to power fluctuations can be ensured.

[0119] (3) By using a mixed gas of water vapor and added hydrogen as the raw material gas for the electrolysis module 111 of the electrolysis device 110, a reducing atmosphere is maintained inside the electrolysis module 111 in a standby state.

[0120] (4) The hydrogen production control device 200 changes the concentration of added hydrogen in the feed gas depending on the operating state of the electrolysis device 110. Here, the operating state may be when all of the electrolysis modules 111 are on standby, when some electrolysis modules 111 are on standby and some are in operation, or when all of the electrolysis modules 111 are in operation. This allows the hydrogen production control device 200 to ensure appropriate reducing atmosphere conditions throughout the entire electrolysis device 110.

[0121] According to the embodiments described above, it is possible to provide a hydrogen production control device, a hydrogen production control method, and a hydrogen production system that can suppress deterioration of the electrolysis cell while ensuring responsiveness to power fluctuations.

[0122] [Other embodiments] Although the embodiments of the present invention have been described above, they are presented as examples and are not intended to limit the scope of the invention. Furthermore, features of each embodiment may be combined. Furthermore, the embodiments may be implemented in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. The embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims. [Explanation of symbols]

[0123] 100... Hydrogen production system, 110... Electrolysis device, 111... Electrolysis module, 111a... First electrolysis module, 111b... Second electrolysis module, 111c... Third electrolysis module, 112... Heating vessel, 115... Electrolysis cell stack, 120... Power supply system, 121... DC power supply device, 122... Electrolysis module power supply, 122a... First electrolysis module power supply, 122b... Second electrolysis module power supply, 122c... Third electrolysis module power supply, 123... Electrolysis module power supply on / off unit, 123a... First electrolysis module power supply Solution module power on / off unit, 123b... second electrolysis module power on / off unit, 123c... third electrolysis module power on / off unit, 124... electrolysis module power connection line, 124a... first electrolysis module power connection line, 124b... second electrolysis module power connection line, 124c... third electrolysis module power connection line, 130... steam system, 131... raw water supply piping, 131a... raw water flow meter, 132... raw water flow regulator, 133... steam generator, 134... raw gas supply piping, 134a... raw gas Pressure gauge, 135...Steam system regenerative heat exchanger, 136...Steam system return pipe, 137...Pipe inside electrolysis device, 137a...First header, 137b...Second header, 137c...Third header, 137d...Fourth header, 137e...Fifth header, 137f...Sixth header, 140...Additional hydrogen supply section, 141...Additional hydrogen supply pipe, 141a...Additional hydrogen flow meter, 142...Additional hydrogen flow regulator, 150...Air system, 151...Air supply pipe, 151a...Purge gas pressure gauge, 152...Air flow regulator, 15 3...Air system regenerative heat exchanger, 154...Air discharge piping, 160...Product recovery section, 161...Hydrogen / water vapor separator, 162...Product recovery piping, 200...Hydrogen production control device, 210...Input section, 220...Memory section, 221...Water vapor flow rate characteristic memory section, 222...Hydrogen concentration characteristic memory section, 223...Calculation result memory section, 230...Calculation section, 231...Power source power information acquisition section, 232...Operation information acquisition section, 233...Raw water flow rate command value calculation section, 234...Additional hydrogen flow rate command value calculation section, 240...Progress control section, 250...Output section

Claims

1. a power supply system including a DC power supply device and a plurality of module power supplies that receive power from the DC power supply device; a plurality of electrolysis modules, each of which receives module power from the module power supply and electrolyzes water vapor into hydrogen; a water vapor system that supplies the water vapor to the plurality of electrolysis modules using the supplied raw water; an added hydrogen supply unit that supplies added hydrogen to be added to the water vapor; a raw water flow rate regulator that adjusts the flow rate of the raw water in response to a raw water flow rate command value for adjusting the flow rate of the raw water; an added hydrogen flow rate regulator that adjusts the flow rate of the added hydrogen in response to an added hydrogen flow rate command value for adjusting the flow rate of the added hydrogen; A hydrogen production control device that controls hydrogen production in a hydrogen production system comprising: a power source power information acquisition unit that acquires power source power information relating to a power source power value of the power source power; an operation information acquisition unit that acquires operation information including the number of operating electrolysis modules that are in an operating state and receive the module power among the plurality of electrolysis modules; a raw water flow rate command value calculation unit that calculates the raw water flow rate command value based on the power supply power information; an added hydrogen flow rate command value calculation unit that calculates the added hydrogen flow rate command value based on the operating information; a progress control unit that determines a module power supply / stop command regarding supplying and stopping the module power to each of the plurality of electrolysis modules based on the power source power information and the operation information; an output unit that outputs the raw water flow rate command value calculated by the raw water flow rate command value calculation unit to the raw water flow rate regulator, outputs the added hydrogen flow rate command value calculated by the added hydrogen flow rate command value calculation unit to the added hydrogen flow rate regulator, and outputs the module power supply / stop command determined by the progress control unit to the power supply system; A hydrogen production control device comprising:

2. a water vapor flow rate characteristic storage unit that stores a water vapor flow rate versus power supply power characteristic, which is a characteristic of the water vapor flow rate of the water vapor required for the power supply power value; a hydrogen concentration characteristic storage unit that stores an added hydrogen concentration versus number of operating electrolysis modules characteristic, which is a characteristic of the added hydrogen concentration of the added hydrogen required for the number of operating electrolysis modules; Further comprising: the raw water flow rate command value calculation unit calculates the raw water flow rate command value based on the power source power information and the steam flow rate versus power source power characteristics; the added hydrogen flow rate command value calculation unit calculates the added hydrogen flow rate command value based on the operation information and the added hydrogen concentration versus number of operating units characteristic; The hydrogen production control device according to claim 1 .

3. 3. The hydrogen production control device according to claim 2, wherein the steam flow rate versus power supply power characteristic is such that the required steam flow rate increases as the power supply power value increases.

4. 3. The hydrogen production control device according to claim 2, wherein the characteristic of the added hydrogen concentration versus the number of operating units is a characteristic in which the required added hydrogen concentration increases as the number of operating electrolysis modules decreases and the number of standby electrolysis modules increases.

5. the power supply system includes, for each of the plurality of module power supplies, an electrolysis module power supply on / off unit that is provided between the module power supply and the electrolysis module that receives the supply of the module power from the module power supply, and that performs an opening and closing operation to start and stop the supply of the module power; the output unit outputs, to the power supply system, a command for the opening and closing operation of the electrolysis module power supply on / off unit of the power supply system as the module power supply / stop command. The hydrogen production control device according to claim 1 .

6. the DC power supply device is a renewable energy power supply that uses solar power or wind power, the power source power information acquisition unit predicts the power source power value based on power prediction information including weather forecasts and performance data. The hydrogen production control device according to claim 1 .

7. further comprising an input unit that receives a control start condition as external information; 2. The hydrogen production control device according to claim 1, wherein the progress control unit selects, based on the control start condition, which of a total operation control method for starting control of the hydrogen production system, in which all of the plurality of electrolysis modules are in the operating state, and a number control method for determining the number of the plurality of electrolysis modules in operation based on the power supply power value.

8. the power supply system; a plurality of said electrolysis modules; the water vapor system; the added hydrogen supply unit; the raw water flow rate regulator; the added hydrogen flow rate regulator; The hydrogen production control device according to any one of claims 1 to 7, A hydrogen production system comprising:

9. a power supply system including a DC power supply device and a plurality of module power supplies that receive power from the DC power supply device; a plurality of electrolysis modules, each of which receives module power from the module power supply and electrolyzes water vapor into hydrogen; a water vapor system that supplies the water vapor to the plurality of electrolysis modules using the supplied raw water; an added hydrogen supply unit that supplies added hydrogen to be added to the water vapor; a raw water flow rate regulator that adjusts the flow rate of the raw water in response to a raw water flow rate command value for adjusting the flow rate of the raw water; an added hydrogen flow rate regulator that adjusts the flow rate of the added hydrogen in response to an added hydrogen flow rate command value for adjusting the flow rate of the added hydrogen; A hydrogen production control method for controlling hydrogen production by a hydrogen production control device in a hydrogen production system comprising: a power source information acquisition unit of the hydrogen production control device acquiring power source information relating to a power source value of the power source; an operation information acquisition unit of the hydrogen production control device acquiring operation information including the number of operating electrolysis modules that are in an operating state and receiving the module power among the plurality of electrolysis modules; a raw water flow rate command value calculation unit of the hydrogen production control device calculating the raw water flow rate command value based on the power source power information; a step in which an added hydrogen flow rate command value calculation unit of the hydrogen production control device calculates the added hydrogen flow rate command value based on the operating information; a progress control unit of the hydrogen production control device determining a module power supply / stop command regarding supplying and stopping the module power to each of the plurality of electrolysis modules based on the power source power information and the operation information; The output unit of the hydrogen production control device is outputting the raw water flow rate command value calculated by the raw water flow rate command value calculation unit to the raw water flow rate regulator; The added hydrogen flow rate command value calculated by the added hydrogen flow rate command value calculation unit is output to the added hydrogen flow rate regulator, and outputting the module power supply / stop command determined by the progress control unit to the power supply system; A hydrogen production control method comprising:

Images