Hydrogen production system, hydrogen production method, and program

Abstract

This invention provides a hydrogen production system, a hydrogen production method, and a program that can increase the amount of hydrogen that can be produced. [Solution] The hydrogen production system 1 comprises a plurality of electrolytic devices 2 that generate hydrogen by electrolyzing a raw material, a plurality of power converters 3 that convert three-phase AC power into DC power and supply DC power to the electrolytic devices 2, and a control device 4 that individually controls the plurality of power converters 3. Each of the plurality of electrolytic devices 2 is connected to a different power converter 3. At least one of the plurality of electrolytic devices 2 is an electrolytic device under test 2S, which is equipped with one or more of the inlet gas state quantity detection unit 141, outlet gas state quantity detection unit 142, and power supply physical quantity detection unit 143. The control device 4 controls the current or voltage supplied to the electrolytic device under test 2S based on the detected values ​​from one or more of the inlet gas state quantity detection unit 141, outlet gas state quantity detection unit 142, and power supply physical quantity detection unit 143.

Description

[[Technical Field]]

[0001] The present invention relates to a hydrogen production system, a hydrogen production method, and a program. [[Background Art]]

[0002] As an apparatus for producing hydrogen, there is a hydrogen production system that generates hydrogen by electrolyzing a raw material such as water. Such a hydrogen production system includes, for example, as described in Patent Document 1, an electrolytic cell stack for electrolyzing the raw material to take out hydrogen, and a power supply that supplies electric power to the electrolytic cell stack. [[Prior Art Literature]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Patent No. 6704998 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] However, such a hydrogen production system has the following problems. For example, in order to meet the demand for higher output of hydrogen, it is conceivable to adopt a configuration including a plurality of electrolysis apparatuses.

[0005] Each electrolysis apparatus has an upper limit of suppliable current due to the restriction of the upper temperature limit, and it is necessary to set the supply current within a range that does not exceed this current upper limit. On the other hand, when a power supply is connected to a plurality of electrolysis apparatuses connected in parallel with each other to supply power to the plurality of electrolysis apparatuses, it is difficult to individually adjust the current supplied to each electrolysis apparatus. Therefore, if an attempt is made to limit the supply current so that the current upper limit is not exceeded for any of the plurality of electrolysis apparatuses, it becomes difficult to achieve higher output of hydrogen.

[0006] This invention has been made in view of the above problems, and aims to provide a hydrogen production system, a hydrogen production method, and a program that can improve the amount of hydrogen that can be produced. [Means for solving the problem]

[0007] One aspect of the present invention is a plurality of electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing a raw material, Multiple power converters (3, 31, 32) convert three-phase AC power into DC power and supply the DC power to the electrolytic device, The system includes a control device (4) that individually controls multiple power converters, Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device under test (2S) equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. The control device is located in a hydrogen production system (1) and is configured to control the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

[0008] Another aspect of the present invention is a method for producing hydrogen in a hydrogen production system (1) comprising: a plurality of electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing a raw material; and a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolytic devices. Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device under test (2S) equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. The hydrogen production method involves controlling the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

[0009] A further aspect of the present invention relates to a hydrogen production system (1) comprising: a plurality of electrolyzers (2, 21, 22) that electrolyze a raw material to produce hydrogen; a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolyzers; and a control device (4) that individually controls the plurality of power converters, wherein the control device is used to control the plurality of power converters when producing hydrogen, and the control device is used to control the plurality of power converters. Each of the multiple electrolytic devices is connected to a different power conversion device, and at least one of the multiple electrolytic devices is an electrolytic device under test (2S) that is equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. The program causes the control device to perform control of the current or voltage supplied to the electrolytic device under test based on the detected values ​​from one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit. [Effects of the Invention]

[0010] In the hydrogen production system described above, each of the multiple electrolytic devices is connected to a different power converter. The control unit then individually controls each of these power converters. This makes it possible to individually control the current or voltage supplied to each of the multiple electrolytic devices. Therefore, the degree of freedom for the current or voltage supplied to each electrolytic device can be increased. As a result, it becomes possible to increase the hydrogen output from the multiple electrolytic devices.

[0011] Furthermore, at least one of the multiple electrolytic devices is the electrolytic device under test. The control device is configured to control the current or voltage supplied to the electrolytic device under test based on the detection values ​​from one or more of the input gas state quantity detection unit, the output gas state quantity detection unit, and the power supply physical quantity detection unit. Therefore, the electrolytic device under test can be supplied with an appropriate current or voltage while knowing the current or voltage that can be supplied according to its state. As a result, it is easy to increase the amount of hydrogen produced by the electrolytic device under test. Consequently, the amount of hydrogen that can be produced by the entire system can also be easily increased.

[0012] As described above, according to the above embodiment, it is possible to provide a hydrogen production system, a hydrogen production method, and a program that can increase the amount of hydrogen that can be produced. The symbols in parentheses in the claims and the means for solving the problem indicate the correspondence with the specific means described in the embodiments later, and do not limit the technical scope of the present invention. [Brief explanation of the drawing]

[0013] [Figure 1] Diagram illustrating the hydrogen production system in Embodiment 1. [Figure 2] Control block diagram in Embodiment 1. [Figure 3] A control flow diagram in Embodiment 1. [Figure 4] Flowchart for calculating the current limit in Embodiment 1. [Figure 5]Flowchart for calculating target current in Embodiment 1. [Figure 6] Explanatory drawing of a hydrogen production system in a comparative example. [Figure 7] Explanatory drawing of effects in Embodiment 1. [Figure 8] Explanatory drawing of a hydrogen production system in Embodiment 2. [Figure 9] Circuit explanatory diagram of a power converter in Embodiment 3. [Figure 10] Circuit explanatory diagram of a power converter in Embodiment 4. Mode for Carrying Out the Invention

[0014] (Embodiment 1) An embodiment relating to a hydrogen production system, a hydrogen production method, and a program will be described with reference to FIG. 1 and FIG. 2. As shown in FIG. 1, the hydrogen production system 1 of the present embodiment includes a plurality of electrolysis devices, a plurality of power conversion devices, a control device, and power supply wirings 5 and 50. Further, the power conversion device 3 of the hydrogen production system 1 is connected to a three-phase AC power supply 11.

[0015] The electrolysis device 2 electrolyzes a raw material to generate hydrogen. The plurality of power conversion devices 3 convert three-phase AC power into DC power, and supply the DC power to the electrolysis devices 2. The control device 4 individually controls the plurality of power conversion devices 3.

[0016] Each of the plurality of electrolysis devices 2 is connected to a mutually different power conversion device 3. The hydrogen production system 1 of the present embodiment includes two electrolysis devices 21 and 22, and two power conversion devices 31 and 32. One power conversion device 31 is connected to one electrolysis device 21 via the power supply wirings 5 and 50, and the other power conversion device 32 is connected to the other electrolysis device 22 via the other power supply wirings 5 and 50. Note that the power supply wiring 5 is a high-potential side wiring, and the power supply wiring 50 is a low-potential side wiring.

[0017] At least one of the multiple electrolytic devices 2 is the electrolytic device 2S under test. Here, the electrolytic device 2S under test is an electrolytic device equipped with one or more of the following: an inlet gas state detection unit 141 for detecting the state of the inlet gas, an outlet gas state detection unit 142 for detecting the state of the outlet gas, and a power supply physical quantity detection unit 143 for detecting the physical quantity of the supplied DC power. In this embodiment, both of the two electrolytic devices 21 and 22 are the electrolytic devices 2S under test. Both of the two electrolytic devices 21 and 22 are equipped with the inlet gas state detection unit 141, the outlet gas state detection unit 142, and the power supply physical quantity detection unit 143, respectively.

[0018] Here, the provision of an inlet gas state quantity detection unit 141, an outlet gas state quantity detection unit 142, and a power supply physical quantity detection unit 143 includes not only cases where these detection units are directly provided on the electrolytic apparatus 2 itself, but also cases where they are indirectly provided on the electrolytic apparatus 2 by being provided in various flow paths connected to the electrolytic apparatus 2. For example, embodiments in which the above detection units are provided on the introduction gas flow path (i.e., the raw material supply flow path 121, the air supply flow path 131), the outlet gas flow path (i.e., the hydrogen outlet flow path 122, the air discharge flow path 132), or the power supply wiring 5, 50 are also included in embodiments where they are provided on the electrolytic apparatus 2.

[0019] The control device 4 is configured to control the current or voltage supplied to the electrolytic device 2S under test based on the detection values ​​from one or more of the inlet gas state quantity detection unit 141, the outlet gas state quantity detection unit 142, and the power supply physical quantity detection unit 143. In this embodiment, as will be described later, the current supplied to the electrolytic device 2S under test is controlled using the detection value from the inlet gas state quantity detection unit 141, the detection value from the outlet gas state quantity detection unit 142, and the detection value from the power supply physical quantity detection unit 143 (see Figure 2).

[0020] As shown in Figure 1, each electrolytic device 2 has a cell stack formed by stacking multiple electrolytic cells 20. In this embodiment, the electrolytic cells 20 are SOECs (i.e., Solid Oxide Electrolysis Cells). Each electrolytic cell 20 has an air electrode and a hydrogen electrode, and further comprises an electrolyte interposed between the hydrogen electrode and the air electrode. Multiple electrolytic cells 20 are connected in series to form a cell stack.

[0021] In this configuration, a gas containing water vapor is supplied to the hydrogen electrode, and air is supplied to the air electrode. In other words, water as a raw material is supplied to the hydrogen electrode in the form of water vapor. The water vapor is introduced into the electrolytic device 2 through the raw material supply channel 121 and supplied to the hydrogen electrode of each electrolytic cell 20. The air is introduced into the electrolytic device 2 through the air supply channel 131 and supplied to the air electrode of each electrolytic cell 20.

[0022] The electrolyte of the electrolytic cell 20 is made of solid oxide ceramic, and oxide ions (O 2- It has conductivity of ). The electrolyte can be made using, for example, yttria-stabilized zirconia, perovskite-type oxide, etc. Then, the electrolyte is heated to a high temperature, for example, 600°C to 800°C, and electricity is supplied between the air electrode and the hydrogen electrode to cause an electrolytic reaction of water vapor. This produces hydrogen at the hydrogen electrode and oxygen at the oxygen electrode.

[0023] In other words, the water vapor supplied to the electrolytic cell 20 reacts at the hydrogen electrode with "H2O + 2e - →H2+O 2- The electrolytic reaction of "" takes place at the air electrode. 2- → 1 / 2O2 + 2e - The following reaction takes place: At the hydrogen electrode, water vapor is electrolyzed, producing hydrogen gas and oxide ions (O 2- Oxide ions are produced. These oxide ions move through the electrolyte to the air electrode, where they are oxidized to oxygen gas.

[0024] The hydrogen-containing gas produced by this electrolytic reaction is discharged from the hydrogen electrode to the outside of the electrolytic cell 20 and out of the electrolytic device 2 through the hydrogen discharge channel 122. The oxygen-containing gas produced is also discharged from the air electrode to the outside of the electrolytic cell 20 and out of the electrolytic device 2 through the air discharge channel 132.

[0025] In this configuration, the power converter 3 supplies power to the electrolytic device 2. Specifically, the power converter 3 converts the three-phase AC power supplied from the three-phase AC power source 11 shown in Figure 2 into DC power, and supplies the DC power to the cell stack of the electrolytic device 2. This DC power is supplied between the air electrode and the hydrogen electrode of each electrolytic cell 20, as described above.

[0026] The control device 4 includes a microcomputer equipped with a processor, memory, and other peripheral circuits. The control device 4 may be composed of multiple microcomputers and their peripheral devices. The control device 4 controls the drive of the power converter 3. That is, the control device 4 controls at least one of the currents and voltages of the multiple power converters 3. In this embodiment, the control device 4 controls the current of the power converter 3. Then, as described above, the control device 4 controls the current supplied to the electrolytic device 2S under test by utilizing the detected value of the inlet gas state quantity detection unit 141, the detected value of the outlet gas state quantity detection unit 142, and the detected value of the power supply physical quantity detection unit 143.

[0027] The inlet gas state quantity detection unit 141 is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component of hydrogen, oxygen, and water vapor in the introduced gas. The flow rate may be a mass flow rate or a volume flow rate. The concentration may be a molar concentration or a volume concentration. The inlet gas state quantity detection unit 141 is provided in either the raw material supply channel 121 or the air supply channel 131, or both. In this embodiment, the inlet gas state quantity detection unit 141 is provided in both the raw material supply channel 121 and the air supply channel 131.

[0028] The gas inlet state detection unit 141 is provided in each of the multiple electrolytic devices 21 and 22. That is, the raw material supply channel 121 and the air supply channel 131 branch off and are connected to the electrolytic devices 21 and 22 respectively, and the gas inlet state detection unit 141 is provided between the branching point and the electrolytic device 21, and between the branching point and the electrolytic device 22.

[0029] The outlet gas state quantity detection unit 142 is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component in the outlet gas, such as hydrogen, oxygen, and water vapor. The meaning of flow rate and concentration is the same as in the case of the inlet gas. The outlet gas state quantity detection unit 142 is provided in either the hydrogen outlet channel 122 or the air discharge channel 132, or both. In this embodiment, the outlet gas state quantity detection unit 142 is provided in both the hydrogen outlet channel 122 and the air discharge channel 132.

[0030] The gas outlet state quantity detection unit 142 is provided in each of the multiple electrolytic devices 21 and 22. Specifically, the hydrogen outlet channel 122 and the air outlet channel 132 are connected to each of the electrolytic devices 21 and 22 and merge downstream, but the gas outlet state quantity detection unit 142 is located upstream of this merging point. In other words, the gas outlet state quantity detection unit 142 is provided in both the hydrogen outlet channel 122 and the air outlet channel 132 between the electrolytic device 21 and the merging point, and in both the hydrogen outlet channel 122 and the air outlet channel 132 between the electrolytic device 21 and the merging point.

[0031] The power supply physical quantity detection unit 143 detects the physical quantities of DC power supplied from the power converter 3 to the electrolytic device 2. Here, the physical quantities of DC power include, for example, current and voltage. The power supply physical quantity detection unit 143 is installed in the power supply wiring 5 and 50.

[0032] The control device 4 is configured to control multiple power converters 3 so that the total amount of hydrogen produced by the entire hydrogen production system 1, i.e., the total amount of hydrogen produced by the multiple electrolytic devices 2 that constitute the hydrogen production system 1, reaches a predetermined target value. As shown in Figure 1, a hydrogen detection unit 144 can also be provided downstream of the confluence point of the hydrogen outlet channels 122 from the multiple electrolytic devices 2.

[0033] Next, an example of a method for controlling the current supplied to the electrolytic device 2 by the control device 4 will be explained with reference to the control block diagram in Figure 2. The power converter 3 controlled by this control block diagram is the power converter 3 that supplies power to the electrolytic device 2S under test. In this embodiment, as described above, all electrolytic devices 21 and 22 are the electrolytic devices 2S under test, so it can be considered that all power converters 31 and 32 are subject to control according to the control block diagram. In the control block diagram in Figure 2, each block element indicates the processing that the control device 4 executes based on a program stored in the memory of the control device 4 when controlling the current supplied to the electrolytic device 2. Also, the arrows in the control block diagram in Figure 2 indicate the information that is input or output when processing is executed in each block.

[0034] For example, when controlling the power converter 31 that supplies power to the electrolytic device 21, the amount of hydrogen required by the electrolytic device 21, the temperature status of the electrolytic device 21, and the current limit of the electrolytic device 21 are calculated and estimated, and then the output required from the power converter 31 is determined. The method for determining the required output will be explained below using the power converter 31 as an example.

[0035] In the control block diagram of Figure 2, the requested output determination unit 401 determines the output current to be requested from the power converter 31. The requested output current is selected from the lower of the current upper limit of the electrolytic device 21 and the target current to be supplied to the electrolytic device 21. The requested output determination unit 401 can also calculate the requested output as the output voltage by multiplying the requested output current by a predetermined coefficient.

[0036] The "current limit for the electrolytic device 21" used in the request output determination unit 401 is calculated in the current limit calculation unit 402. The current limit is calculated as the maximum current that does not exceed the temperature limit that ensures normal operation of the electrolytic device 21 (hereinafter also referred to as the "allowable temperature limit"). The allowable temperature limit is predetermined for each electrolytic device 2. That is, the allowable temperature limit for the electrolytic device 21 is predetermined. The current limit is calculated based on the corrected estimated value of the current temperature of the electrolytic device 21 (also referred to as the "corrected estimated device temperature") obtained in the temperature estimation unit 403 and correction unit 404 below, and the above-mentioned allowable temperature limit. For example, the current limit can be calculated by multiplying the difference between the allowable temperature limit and the corrected estimated value of the current temperature of the electrolytic device 21 by a certain value.

[0037] The temperature estimation unit 403 estimates the temperature of the electrolytic device 21 and the temperature of the discharged gas (air (or oxygen) and hydrogen) discharged from the electrolytic device 21, based on the temperature and flow rate of the introduced gas (raw material gas and air) and the detected value of the currently supplied current. The gas temperature and flow rate can be estimated using the detected value by the input gas state quantity detection unit 141. The currently supplied current can be estimated using the detected value by the power supply physical quantity detection unit 143. In addition, the temperature of the electrolytic device 21 and the temperature of the discharged gas are estimated by considering the physical characteristics of the electrolytic device 21, such as heat transfer and Joule heating, along with these detected values. The estimated temperature of the electrolytic device 21 by the temperature estimation unit 403 is referred to as the base estimated device temperature.

[0038] In the correction unit 404, the estimated temperature of the discharged gas estimated by the temperature estimation unit 403 is compared with the actual temperature of the discharged gas detected by the discharged gas state quantity detection unit 142. Based on this comparison information, a correction amount for the base estimated device temperature is calculated. The base estimated device temperature is corrected to the value of the corrected estimated device temperature based on the correction amount. The corrected estimated device temperature of the electrolytic device 21 is then sent to the current upper limit calculation unit 402.

[0039] On the other hand, the "target current to supply to the electrolytic device 21" used in the request output determination unit 401 is calculated in the current target calculation unit 405. The target current to supply to the electrolytic device 21 is calculated based on the target amount of hydrogen produced by the electrolytic device 21 and the Faraday efficiency. That is, the current target can be calculated using the formula: (target amount of hydrogen produced) ÷ (Faraday efficiency) = (current target).

[0040] The Faraday efficiency is calculated by the Faraday efficiency calculation unit 406. The Faraday efficiency calculation unit 406 can be calculated based on the amount of hydrogen currently produced by the electrolytic device 21 (hydrogen production amount) and the current supplied to the electrolytic device 21 (in other words, the output current of the power converter 31). That is, the value calculated by (hydrogen amount) ÷ (current) = (Faraday efficiency) can be used as the Faraday efficiency by the current target calculation unit 405. The hydrogen production amount may be the value detected by the gas output state amount detection unit 142, or the value estimated by the hydrogen production amount estimation unit 407.

[0041] The hydrogen production amount estimation unit 407 can estimate the amount of hydrogen produced based on the amount of oxygen detected by the outlet gas state quantity detection unit 142. That is, the amount of hydrogen produced can be estimated using the formula: (amount of oxygen) × (reaction molar ratio of hydrogen to oxygen) = (estimated hydrogen production amount). Alternatively, the hydrogen production amount estimation unit 407 can estimate the amount of hydrogen produced based on the amount of water vapor detected by the inlet gas state quantity detection unit 141 and the amount of water vapor detected by the outlet gas state quantity detection unit 142. That is, the amount of hydrogen produced can be estimated using the formula: {(amount of water vapor in the inlet gas) - (amount of water vapor in the outlet gas)} ÷ (reaction molar ratio of hydrogen to water vapor) = (estimated hydrogen production amount).

[0042] The "target amount of hydrogen to be produced by the electrolyzer 21" is calculated by the individual hydrogen target amount calculation unit 408. The individual hydrogen target amount calculation unit 408 calculates the target amount of hydrogen to be produced by electrolyzer 21 by dividing the target amount of hydrogen production required for the entire hydrogen production system 1 among the multiple electrolyzers 21 and 22. Regarding how the distribution is done, it is conceivable to simply divide the overall target amount equally, or it can be set appropriately according to the performance and condition of each electrolyzer 21 and 22.

[0043] In this way, the control device 4 determines the output current to be requested from the power converter 31 and controls the power converter 31 to supply that current to the electrolytic device 21.

[0044] Furthermore, the control device 4 controls the other power converter 32 in the same manner as the control device 31 described above. In other words, the control device 4 determines the output current to be supplied to the power converter 32 and controls the power converter 32 to supply that current to the electrolytic device 22. Specifically, it calculates and estimates the amount of hydrogen to be produced by the electrolytic device 22, the temperature status of the electrolytic device 22, the current limit of the electrolytic device 22, etc., and then determines the output to be supplied to the power converter 32.

[0045] As described above, the control device 4 individually controls the multiple power converters 31 and 32, and individually controls the current supplied to the multiple electrolytic devices 21 and 22. Figure 3 is a flowchart illustrating the flow of the request output determination process executed by the control device 4 described in the control block diagram of Figure 2. First, the control device 4 performs a process to calculate the current limit output by the electrolytic device 21 (step S1). Next, the control device 4 calculates the current target to be supplied to the electrolytic device 21 (step S2). Next, the control device 4 performs a process to determine the request output current based on the calculated current limit and current target (step S3). Next, the control device 4 controls the power converter 31 so that current is supplied to the electrolytic device 21 based on the request output current (step S4). The control device 4 controls the current supplied to multiple electrolytic devices 21 and 22 individually by performing the same process for other power converters 32. Note that, regarding the current limit calculation process (step S1) and the current target calculation process (step S2) in Figure 3, the current target calculation process (step S2) may be executed before the current limit calculation process (step S1).

[0046] Figure 4 is a flowchart illustrating the current limit calculation process (step S1) in the main flow shown in Figure 3. The control device 4 acquires the temperature, flow rate, and currently supplied current of the introduced gas (raw material gas and air) introduced into the electrolytic device 21 (step S11). Next, the control device 4 estimates the base estimated device temperature and the temperature of the discharged gas based on the acquired information on the temperature, flow rate, and currently supplied current of the introduced gas (raw material gas and air) (step S12). Next, the control device 4 acquires the detected temperature of the discharged gas (step S13). Next, the control device 4 corrects the base estimated device temperature by comparing the estimated temperature of the discharged gas with the temperature of the discharged gas actually detected by the discharged gas state quantity detection unit 142 (step S14). Next, the control device 4 calculates the current limit based on the corrected estimated device temperature and the allowable temperature limit set for each device (step S15).

[0047] Figure 5 is a flowchart illustrating the current target calculation process (step S2) in the main flow shown in Figure 3. The control device 4 acquires information on the amount of output gas (oxygen and water vapor) and the amount of input gas (water vapor) (step S21). Next, the control device 4 estimates the current hydrogen production amount based on the acquired information such as the amount of oxygen (step S22). Next, the control device 4 calculates the Faraday efficiency based on the estimated current hydrogen production amount and the current output current value (step S23). Next, the control device 4 acquires information on the required hydrogen production amount for the entire hydrogen production system 1, i.e., the multiple electrolyzers 2, and calculates the individual hydrogen production target amount for each electrolyzer 21 (step S24). Next, the control device 4 calculates the current target value to supply to the electrolyzer 21 based on the Faraday efficiency value and the hydrogen production target amount value (step S25). Based on the required output current determined through the above flow, the multiple power converters 3 are controlled so that the total hydrogen production amount from the multiple electrolyzers 2 reaches a predetermined target value. The control device 4 may also perform the Faraday efficiency calculation process (step S23) after the individual hydrogen target amount calculation process (step S24) in the flowchart described above.

[0048] Next, we will explain the effects and benefits of this embodiment. In the hydrogen production system 1 described above, each of the multiple electrolytic devices 21 and 22 is connected to different power converters 31 and 32. The control device 4 controls the multiple power converters 31 and 32 individually. This makes it possible to individually control the current supplied to each of the multiple electrolytic devices 21 and 22. Therefore, the degree of freedom of the current supplied to each electrolytic device 21 and 22 can be increased. As a result, it becomes possible to increase the hydrogen output from the multiple electrolytic devices 21 and 22.

[0049] For example, consider a comparative hydrogen production system 9 in which multiple electrolyzers 21 and 22 are connected to a single power converter 93, as shown in Figure 6. In this comparative hydrogen production system 9, the current supplied to each electrolyzer 21 and 22 cannot be individually controlled, and the above-mentioned effects cannot be obtained. There are individual differences in the upper limit of current that can ensure normal operation of the electrolyzers 21 and 22 (see Ih1 and Ih2 in Figure 7). Furthermore, even if these are connected in parallel to each other and connected to the power converter 93, the current will not flow evenly between electrolyzers 21 and 22 due to differences in the flow rate of the raw material gas introduced, individual differences in the temperature of the devices, individual differences in the electrical resistance of the devices, etc., and the current distribution will also vary.

[0050] Consequently, if we try to supply current to each of the electrolytic devices 21 and 22 without exceeding the current limits Ih1 and Ih2, it becomes difficult to increase the supplied current to near the current limits Ih1 and Ih2 of each electrolytic device 21 and 22, as shown in the "Comparison Configuration" graph in Figure 7. The example shown in the same figure illustrates a situation where the current supplied to electrolytic device 21 cannot be increased to near the current limit Ih1 of that electrolytic device 21.

[0051] In contrast, in the hydrogen production system 1 of this embodiment, the power converters 31 and 32 can be controlled individually, and the current supplied to the multiple electrolytic devices 21 and 22 can be controlled individually. Therefore, as shown in the graph of "Embodiment 1" in Figure 7, it is possible to supply current to each of the electrolytic devices 21 and 22 up to the current upper limits Ih1 and Ih2. As a result, the amount of hydrogen that can be produced by the entire system can be increased. In other words, it is possible to easily achieve high power output of hydrogen.

[0052] Furthermore, the control device 4 is configured to control the current supplied to the electrolytic device 2 based on the values ​​detected by the inlet gas state quantity detection unit 141, the outlet gas state quantity detection unit 142, and the power supply physical quantity detection unit 143. Therefore, the electrolytic device 2 can be supplied with an appropriate current while knowing the current that can be supplied according to its state. As a result, it is easy to increase the amount of hydrogen produced by the electrolytic device 2. Consequently, the amount of hydrogen that can be produced by the entire system can also be easily increased.

[0053] Furthermore, in this embodiment, all of the multiple electrolytic devices 21 and 22 are the electrolytic device 2S under test. Therefore, the amount of hydrogen that can be output can be improved for each of the multiple electrolytic devices 21 and 22, and the hydrogen production amount of the entire system can be improved.

[0054] The control device 4 controls the multiple power converters 3 so that the total amount of hydrogen produced by the multiple electrolyzers 2 reaches a predetermined target value. Therefore, the desired amount of hydrogen can be produced.

[0055] As described above, this embodiment provides a hydrogen production system, a hydrogen production method, and a program that can improve the amount of hydrogen that can be produced. In this embodiment, the electrolytic device 2S under test is shown to have an inlet gas state quantity detection unit 141, an outlet gas state quantity detection unit 142, and a power supply physical quantity detection unit 143, but it is also possible to have an embodiment with one or two of these detection units. For example, if the hydrogen production system is equipped only with the power supply physical quantity detection unit among the above detection units, it is possible to calculate the required output current based on the current output current.

[0056] (Embodiment 2) In this embodiment, as shown in Figure 8, the control device 4 has a first control unit 41 and a second control unit 42. The first control unit 41 is connected to one or more of the inlet gas state quantity detection unit 141, the outlet gas state quantity detection unit 142, and the power supply physical quantity detection unit 143. The second control unit 42 is connected to the power converter 3. The first control unit 41 and the second control unit 42 are connected to each other.

[0057] In this embodiment, the first control unit 41 is connected to the inlet gas state quantity detection unit 141, the outlet gas state quantity detection unit 142, and the power supply physical quantity detection unit 143. The detection signals from the inlet gas state quantity detection unit 141, the outlet gas state quantity detection unit 142, and the power supply physical quantity detection unit 143 are sent to the first control unit 41. The first control unit 41 uses these detection signals to calculate the current to be supplied to each electrolytic device 21, 22, that is, the output current (required output current) to be requested from each power converter 31, 32. The configuration shown in the control block diagram described in Embodiment 1 is provided by the first control unit 41.

[0058] The second control unit 42 drives and controls each power converter 31 and 32 based on the requested output current obtained by the first control unit 41. In other words, it individually drives and controls power converter 31 and power converter 32 so that the required output current is obtained for each.

[0059] Each of the first control unit 41 and the second control unit 42 has a microcomputer equipped with a processor, memory, and other peripheral circuits. Otherwise, it is the same as in Embodiment 1. Note that, among the reference numerals used in Embodiment 2 and later, those that are the same as those used in the previously described embodiments represent the same components, etc., as in the previously described embodiments, unless otherwise specified.

[0060] In this configuration, when changing the number of electrolytic devices 2, for example, it is possible to configure the hydrogen production system 1 by changing the first control unit 41 without changing the entire control device 4, including the second control unit 42. Therefore, it is possible to easily accommodate various system configurations while keeping costs down. Furthermore, it has the same effects and advantages as Embodiment 1.

[0061] (Embodiment 3) In this embodiment, as shown in Figure 9, an example of the configuration of multiple power converters 3 provided in the hydrogen production system 1 will be described. In the same figure, only one power converter 3 is shown, but the hydrogen production system 1 is equipped with multiple power converters 3, and each of the multiple power converters 3 is connected to a different electrolytic device 2. This point is the same as in Embodiment 1.

[0062] The power converter 3 includes a first power converter 3A that converts three-phase AC power to DC power, and a second power converter 3B that converts the DC power converted by the first power converter 3A to DC power of a different voltage. The first power converter 3A and the second power converter 3B are connected by a high-potential side wiring 331 and a low-potential side wiring 332.

[0063] The first power conversion unit 3A has three or more legs (hereinafter referred to as "first legs 341") connected in parallel to each other between the high-potential side wiring 33H and the low-potential side wiring 33L. Each first leg 341 consists of an upper arm switch (hereinafter referred to as "first upper arm switch 351u") connected to the high-potential side wiring 331 and a lower arm switch (hereinafter referred to as "first lower arm switch 351d") connected to the low-potential side wiring 33L, connected in series.

[0064] The connection point between the first upper arm switch 351u and the first lower arm switch 351d in the first leg 341 is connected to the input wiring 301 into which three-phase AC power is input. A DC link capacitor 361 is connected between the high-potential side wiring 33H and the low-potential side wiring 33L between the first power conversion unit 3A and the second power conversion unit 3B.

[0065] The second power conversion unit 3B has a second leg 342 and a reactor 362 connected between the high-potential side wiring 33H and the low-potential side wiring 33L. The second leg 342 consists of a second upper arm switch 352u connected to the high-potential side wiring 33H and a second lower arm switch 352d connected to the low-potential side wiring 33L, connected in series. On the electrolytic device 2 side of the reactor 362, a capacitor 363 is connected between a pair of power supply wirings 5 ​​and 50.

[0066] The reactor 362 is connected between the connection point of the second upper arm switch 352u and the second lower arm switch 352d in the second leg 342 and the power supply wiring 5. The low-potential side wiring 33L is connected to the power supply wiring 50. The power supply wiring 5 is connected to the positive electrode of the electrolytic device 2, and the power supply wiring 50 is connected to the negative electrode of the electrolytic device 2.

[0067] The input wiring 301 is connected to the supply wiring 151 for three-phase AC power from the three-phase AC power supply 11. The supply wiring 151 is provided with a precharge circuit 152 and a filter circuit 153. The precharge circuit 152 includes, for example, a switch and a resistor to prevent inrush current from flowing from the three-phase AC power supply 11 to the power converter 3. The filter circuit 153 includes, for example, an inductor and a capacitor to remove noise components from the three-phase AC power supplied from the three-phase AC power supply 11. The three-phase AC power supply 11 can be, for example, a power grid.

[0068] In the first power conversion unit 3A of the power conversion device 3, the input three-phase AC power is converted to DC power by appropriate switching operations of a plurality of first upper arm switches 351u and a plurality of first lower arm switches 351d. This DC power is used to charge the DC link capacitor 361. Then, in the second power conversion unit 3B, this DC power is converted to DC power of an appropriate voltage by appropriate switching operations of the second upper arm switch 352u and the second lower arm switch 352d and output. This output DC power is supplied to the electrolytic device 2.

[0069] Each of the switches, the first upper arm switch 351u, the first lower arm switch 351d, the second upper arm switch 352u, and the second lower arm switch 352d, has a freewheeling diode connected in antiparallel. The switching operation of the first upper arm switch 351u, the first lower arm switch 351d, the second upper arm switch 352u, and the second lower arm switch 352d is controlled by a drive signal from the control device 4. The first upper arm switch 351u, the first lower arm switch 351d, the second upper arm switch 352u, and the second lower arm switch 352d can be constructed using, for example, IGBTs (i.e., insulated gate bipolar transistors) or MOSFETs (MOS-type field-effect transistors). Other aspects are the same as in Embodiment 1.

[0070] In this configuration, three-phase AC power can be easily converted to desired DC power. Furthermore, the power converter 3 can be a power converter for vehicles such as electric vehicles that has been adapted for use in the hydrogen production system 1. In other words, the vehicle power converter is connected between the vehicle's drive battery and drive motor. By connecting the electrolytic device 2 to the side where the drive battery is connected and the three-phase AC power supply 11 to the side where the drive motor is connected, the power converter can be used as a power converter for the hydrogen production system 1. Furthermore, it has the same effects and advantages as Embodiment 1.

[0071] (Embodiment 4) As shown in Figure 10, this embodiment is a variation of Embodiment 3 and is another example of the configuration of the multiple power converters 3 provided in the hydrogen production system 1. In this embodiment, the second power conversion unit 3B in the power conversion device 3 has a plurality of second legs 342. In particular, this embodiment shows an example in which the second power conversion unit 3B has three second legs 342.

[0072] Output wires 343 are connected to the connection points of the second upper arm switch 352u and the second lower arm switch 352d in the three second legs 342. Two of these three output wires 343 are connected to the power supply wire 5, which is connected to the positive electrode of the electrolytic device 2, via the reactor 364. The remaining one of the three output wires 343 is idle.

[0073] Furthermore, the low-potential wiring 33L is connected to the power supply wiring 50, which is connected to the negative electrode of the electrolytic device 2, via the extraction wiring 331L. A filter capacitor 365 is connected between the power supply wiring 5 and the power supply wiring 50. Although the high-potential wiring 33H is also connected to the extraction wiring 331H, this extraction wiring 331H is idle wiring.

[0074] The second power conversion unit 3B converts DC power to DC power of an appropriate voltage and outputs it by the appropriate switching operation of multiple second upper arm switches 352u and multiple second lower arm switches 352d. However, the second upper arm switches 352u and second lower arm switches 352d of the second leg 342 to which the idle output wiring 343 is connected are not switched and are both left open (i.e., disconnected). Otherwise, it has the same configuration and effects as Embodiment 3.

[0075] In the above embodiment, the hydrogen production system 1 was described as having two electrolytic devices and two power converters, but the number of electrolytic devices and power converters can each be three or more.

[0076] Furthermore, although the above embodiment describes a case where all electrolytic devices are electrolytic devices under measurement, it is also possible to configure a hydrogen production system in which some of the multiple electrolytic devices are electrolytic devices under measurement, and others are not. For example, in a hydrogen production system having three electrolytic devices, one or two of the three electrolytic devices may be electrolytic devices in which none of the input gas state quantity detection unit, output gas state quantity detection unit, or power supply physical quantity detection unit are provided.

[0077] The present invention is not limited to the embodiments described above, and can be applied to various embodiments without departing from its spirit.

[0078] The features of this invention are as follows. [1] Multiple electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing raw materials, Multiple power converters (3, 31, 32) convert three-phase AC power into DC power and supply the DC power to the electrolytic device, The system includes a control device (4) that individually controls multiple power converters, Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device under test (2S) equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. The control device is configured to control the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the input gas state quantity detection unit, the output gas state quantity detection unit, and the power supply physical quantity detection unit, in a hydrogen production system (1). [2] The hydrogen production system according to [1], wherein each of the multiple electrolytic devices is the electrolytic device to be measured. [3] The power converter includes a first power converter (3A) that converts the three-phase AC power into DC power, and a second power converter (3B) that converts the DC power converted by the first power converter into DC power of a different voltage, and the first power converter and the second power converter are connected by a high-potential side wiring (33H) and a low-potential side wiring (33L). The first power conversion unit has three or more legs (341) connected in parallel to each other between the high-potential side wiring and the low-potential side wiring, and each leg consists of an upper arm switch (351u) connected to the high-potential side wiring and a lower arm switch (351d) connected to the low-potential side wiring connected in series. The hydrogen production system according to claim [1] or [2], wherein the connection point between the upper arm switch and the lower arm switch in the leg is connected to the input wiring (301) into which the three-phase AC power is input. [4] The control device comprises a first control unit (41) connected to one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit, and a second control unit (42) connected to the power converter, wherein the first control unit and the second control unit are connected to each other, and the hydrogen production system according to any one of [1] to [3]. [5] The hydrogen production system according to any one of [1] to [4], wherein the input gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component of hydrogen, oxygen, and water vapor in the input gas. [6] The hydrogen production system according to any one of [1] to [5], wherein the outlet gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component of hydrogen, oxygen, and water vapor in the outlet gas. [7] The control device is configured to control the plurality of power converters so that the total amount of hydrogen produced by the plurality of electrolyzers reaches a predetermined target value, as described in any of [1] to [6]. [8] A method for producing hydrogen in a hydrogen production system (1) comprising: a plurality of electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing a raw material; and a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolytic devices, Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device under test (2S) equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. A hydrogen production method comprising controlling the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit. [9] The hydrogen production method according to [8], wherein each of the multiple electrolytic devices is the electrolytic device to be measured.

[10] The power converter includes a first power converter (3A) that converts the three-phase AC power into DC power, and a second power converter (3B) that converts the DC power converted by the first power converter into DC power of a different voltage, and the first power converter and the second power converter are connected by a high-potential side wiring (33H) and a low-potential side wiring (33L). The first power conversion unit has three or more legs (341) connected in parallel to each other between the high-potential side wiring and the low-potential side wiring, and each leg consists of an upper arm switch (351u) connected to the high-potential side wiring and a lower arm switch (351d) connected to the low-potential side wiring connected in series. The hydrogen production method according to [8] or [9], wherein the connection point between the upper arm switch and the lower arm switch in the leg is connected to the input wiring (301) into which the three-phase AC power is input.

[11] The hydrogen production method according to any one of [8] to

[10] , wherein the input gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component of hydrogen, oxygen, and water vapor in the input gas supplied to the electrolytic device to be measured.

[12] The gas output state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component, hydrogen, oxygen, and water vapor, in the output gas discharged from the electrolytic device under measurement, as described in any of [8] to

[11] .

[13] A hydrogen production method according to any one of [8] to

[12] , wherein the multiple power converters are controlled so that the total amount of hydrogen produced by the multiple electrolytic devices reaches a predetermined target value.

[14] A hydrogen production system (1) comprising: a plurality of electrolyzers (2, 21, 22) that electrolyze raw materials to produce hydrogen; a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolyzers; and a control device (4) that individually controls the plurality of power converters, wherein a program is provided for causing the control device to execute the control of the plurality of power converters when producing hydrogen, Each of the multiple electrolytic devices is connected to a different power conversion device, and at least one of the multiple electrolytic devices is an electrolytic device under test (2S) that is equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. A program that causes the control device to control the current or voltage supplied to the electrolytic device under test based on the detected values ​​from one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

[15] The program according to

[14] that causes the control device to control the plurality of power converters so that the total amount of hydrogen produced by the plurality of electrolyzers reaches a predetermined target value. [Explanation of symbols]

[0079] 1. Hydrogen production system 2, 21, 22 Electrolyzer 2S Electrolytic device to be measured 3, 31, 32 Power converters 4. Control device

Claims

1. Multiple electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing raw materials, Multiple power converters (3, 31, 32) convert three-phase AC power into DC power and supply the DC power to the electrolytic device, The system includes a control device (4) that individually controls a plurality of the aforementioned power converters, Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device to be measured (2S) that is equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. Hydrogen production system (1), wherein the control device is configured to control the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

2. The hydrogen production system according to claim 1, wherein each of the multiple electrolytic devices is the electrolytic device to be measured.

3. The power conversion device includes a first power conversion unit (3A) that converts the three-phase AC power into DC power, and a second power conversion unit (3B) that converts the DC power converted by the first power conversion unit into DC power of a different voltage, and the first power conversion unit and the second power conversion unit are connected by a high-potential side wiring (33H) and a low-potential side wiring (33L). The first power conversion unit has three or more legs (341) connected in parallel to each other between the high-potential side wiring and the low-potential side wiring, and each leg is made up of an upper arm switch (351u) connected to the high-potential side wiring and a lower arm switch (351d) connected to the low-potential side wiring connected in series. The hydrogen production system according to claim 1 or 2, wherein the connection point between the upper arm switch and the lower arm switch in the leg is connected to the input wiring (301) into which the three-phase AC power is input.

4. The hydrogen production system according to claim 1 or 2, wherein the control device comprises a first control unit (41) connected to one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit, and a second control unit (42) connected to the power conversion device, and the first control unit and the second control unit are connected to each other.

5. The hydrogen production system according to claim 1 or 2, wherein the inlet gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component, such as hydrogen, oxygen, and water vapor, in the introduced gas.

6. The hydrogen production system according to claim 1 or 2, wherein the outlet gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component, such as hydrogen, oxygen, and water vapor, in the outlet gas.

7. The hydrogen production system according to claim 1 or 2, wherein the control device is configured to control the plurality of power converters so that the total amount of hydrogen produced by the plurality of electrolytic devices reaches a predetermined target value.

8. A method for producing hydrogen using a hydrogen production system (1) comprising: a plurality of electrolytic devices (2, 21, 22) that generate hydrogen by electrolyzing a raw material; and a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolytic devices, Each of the multiple electrolytic devices is connected to a different power converter. At least one of the multiple electrolytic devices is an electrolytic device to be measured (2S) that is equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. A hydrogen production method comprising controlling the current or voltage supplied to the electrolytic device under test based on a value detected by one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

9. The hydrogen production method according to claim 8, wherein each of the multiple electrolytic devices is the electrolytic device to be measured.

10. The power conversion device includes a first power conversion unit (3A) that converts the three-phase AC power into DC power, and a second power conversion unit (3B) that converts the DC power converted by the first power conversion unit into DC power of a different voltage, and the first power conversion unit and the second power conversion unit are connected by a high-potential side wiring (33H) and a low-potential side wiring (33L). The first power conversion unit has three or more legs (341) connected in parallel to each other between the high-potential side wiring and the low-potential side wiring, and each leg is made up of an upper arm switch (351u) connected to the high-potential side wiring and a lower arm switch (351d) connected to the low-potential side wiring connected in series. The hydrogen production method according to claim 8 or 9, wherein the connection point between the upper arm switch and the lower arm switch in the leg is connected to the input wiring (301) into which the three-phase AC power is input.

11. The hydrogen production method according to claim 8 or 9, wherein the input gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component, such as hydrogen, oxygen, and water vapor, in the input gas supplied to the electrolytic device to be measured.

12. The hydrogen production method according to claim 8 or 9, wherein the outlet gas state quantity detection unit is configured to detect one or more of the flow rate, pressure, temperature, and concentration of at least one gas component, such as hydrogen, oxygen, and water vapor, in the outlet gas discharged from the electrolytic device under measurement.

13. The hydrogen production method according to claim 8 or 9, wherein the plurality of power converters are controlled so that the total amount of hydrogen produced by the plurality of electrolytic devices reaches a predetermined target value.

14. A hydrogen production system (1) comprises a plurality of electrolyzers (2, 21, 22) that electrolyze raw materials to produce hydrogen, a plurality of power converters (3, 31, 32) that convert three-phase AC power into DC power and supply the DC power to the electrolyzers, and a control device (4) that individually controls the plurality of power converters, and a program for causing the control device to control the plurality of power converters when producing hydrogen in the system. Each of the multiple electrolytic devices is connected to a different power conversion device, and at least one of the multiple electrolytic devices is an electrolytic device under test (2S) that is equipped with one or more of the following: an inlet gas state quantity detection unit (141) for detecting the state quantity of the inlet gas, an outlet gas state quantity detection unit (142) for detecting the state quantity of the outlet gas, and a power supply physical quantity detection unit (143) for detecting the physical quantity of the supplied DC power. A program that causes the control device to control the current or voltage supplied to the electrolytic device under test based on the detected values ​​from one or more of the inlet gas state quantity detection unit, the outlet gas state quantity detection unit, and the power supply physical quantity detection unit.

15. The program according to claim 14, which causes the control device to control the plurality of power converters so that the total amount of hydrogen produced by the plurality of electrolytic devices reaches a predetermined target value.

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