Hydrogen production system and control method thereof

Abstract

This invention relates to a hydrogen production system and its control method. The method includes: determining the operating parameters of the hydrogen production system based on the output information of a new energy power generation device; and selecting an activation mode and a deactivation mode from multiple preset modes of the hydrogen production units based on the operating parameters and operating demand information of the hydrogen production system. This invention, by combining the output information of the new energy power generation device with the selection of activation and deactivation of hydrogen production units according to the operating status of the hydrogen production system, can improve the operating efficiency of the hydrogen production system.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, and in particular to a hydrogen production system and its control method. Background Technology

[0002] In traditional constant-power hydrogen production processes, the operation of electrolyzers is mostly manually set by operators according to the production plan. However, for new energy hydrogen production systems, due to the fluctuations and intermittent nature of new energy input, using the constant-power electrolyzer operation method would lead to a decrease in the operating efficiency of the hydrogen production system. Summary of the Invention

[0003] This invention provides a hydrogen production system and its control method, which can improve the operating efficiency of the new energy hydrogen production system by controlling the input and output of the hydrogen production unit.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides a method for controlling a hydrogen production system, comprising:

[0006] The operating parameters of the hydrogen production system are determined based on the output information of the new energy power generation device.

[0007] Based on the operating parameter information and operating demand information of the hydrogen production system, the input mode and the output mode are selected from multiple preset modes of the hydrogen production unit of the hydrogen production system.

[0008] Optionally, the preset mode includes:

[0009] Operation Mode 1: Simultaneously operate all hydrogen production units of the hydrogen production system;

[0010] Input Mode 2: Input hydrogen production units of the hydrogen production system one by one;

[0011] Input Mode 3: Simultaneously input at least two hydrogen production units of the hydrogen production system.

[0012] Optionally, the method for selecting the input mode based on the operating parameter information of the hydrogen production system and the operating demand information includes:

[0013] The activation mode is selected based on the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system.

[0014] Optionally, the step of selecting the activation mode based on the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system includes:

[0015] When there is a hot standby requirement for the hydrogen production system, an input mode is selected from input mode one and input mode three according to the input electrical parameters of the hydrogen production system.

[0016] In the absence of a hot standby requirement for the hydrogen production system, the second input mode is selected.

[0017] Optionally, selecting an input mode from input mode one and input mode three based on the input electrical parameters of the hydrogen production system includes:

[0018] When the input electrical parameters of the hydrogen production system are greater than the preset input electrical parameters of the hydrogen production system, the first input mode is selected;

[0019] When the input electrical parameters of the hydrogen production system are not greater than the preset input electrical parameters of the hydrogen production system, the third input mode is selected.

[0020] Optionally, the preset mode further includes:

[0021] Cut-off mode 1: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the first operating limit.

[0022] Cut-off mode 2: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the second operating limit.

[0023] Wherein, the first operating limit is greater than the second operating limit.

[0024] Optionally, the method for selecting the cut-off mode based on the operating parameter information of the hydrogen production system and the operating demand information includes:

[0025] The cut-off mode is selected based on the fluctuation of the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system.

[0026] Optionally, the step of selecting the cut-off mode based on the fluctuation of the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system includes:

[0027] If there is no need for the hydrogen production system to be in standby mode, and the difference between the input electrical parameters of the hydrogen production system at adjacent times is less than a first preset difference, then the cut-out mode one is selected.

[0028] Optionally, the step of selecting the cut-off mode based on the fluctuation of the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system includes:

[0029] When there is a hot standby requirement for the hydrogen production system, if the difference between the input electrical parameters of the hydrogen production system at adjacent times is greater than a second preset difference, then the second cut-out mode is selected.

[0030] The present invention also provides a hydrogen production system, comprising:

[0031] Controller and at least one hydrogen production unit;

[0032] The entry and exit of the hydrogen production unit are controlled by the controller;

[0033] The controller is used to execute the hydrogen production system control method described above.

[0034] Optionally, the hydrogen production unit includes:

[0035] At least one electrolytic cell;

[0036] The insertion and removal of the electrolytic cell are controlled by the controller.

[0037] Optionally, the hydrogen production unit further includes:

[0038] At least one gas-liquid separator;

[0039] Each of the gas-liquid separators is connected to at least one of the electrolytic cells.

[0040] Optionally, the hydrogen production unit further includes:

[0041] Hydrogen production power source;

[0042] The input end of the hydrogen production power supply is connected to the new energy power generation device, and the output end of the hydrogen production power supply is connected to the electrolyzer.

[0043] As can be seen from the above technical solutions, this invention discloses a hydrogen production system and its control method. The system determines the operating parameters of the hydrogen production system based on the output information of the new energy power generation device. Based on the operating parameters and operational demand information of the hydrogen production system, it selects an input mode and a cut-off mode from multiple preset modes of the hydrogen production units. This invention, by combining the output information of the new energy power generation device with the selection of hydrogen production unit input and cut-off based on the operating status of the hydrogen production system, can improve the operating efficiency of the hydrogen production system.

[0044] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of a hydrogen production system control method provided in an embodiment of the present invention;

[0047] Figure 2 (a) is a schematic diagram of an input mode provided in an embodiment of the present invention;

[0048] Figure 2 (b) is a schematic diagram of input mode two provided in an embodiment of the present invention;

[0049] Figure 2 (c) is a schematic diagram of input mode three provided in an embodiment of the present invention;

[0050] Figure 3 (a) is a schematic diagram of a cutting mode provided in an embodiment of the present invention;

[0051] Figure 3 (b) is a schematic diagram of the second cutting mode provided in the embodiment of the present invention;

[0052] Figure 4 (a) is a schematic diagram of another cutting mode provided in an embodiment of the present invention;

[0053] Figure 4 (b) is a schematic diagram of another cutting mode provided in an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of the input and output of a hydrogen production unit provided in an embodiment of the present invention;

[0055] Figure 6 (a) is a schematic diagram of another hydrogen production unit input and output provided in an embodiment of the present invention;

[0056] Figure 6 (b) is a schematic diagram of another hydrogen production unit input and output provided in an embodiment of the present invention;

[0057] Figure 7 This is a schematic diagram of a hydrogen production system provided in an embodiment of the present invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] This invention provides a control method for a hydrogen production system, such as... Figure 1 As shown, the method includes:

[0060] Step 101: Determine the operating parameters of the hydrogen production system based on the output information of the new energy power generation device.

[0061] Step 102: Based on the operating parameter information and operating demand information of the hydrogen production system, select the input mode and the output mode from the various preset modes of the hydrogen production unit of the hydrogen production system.

[0062] The new energy power generation device can provide electricity to the hydrogen production system. The output information of the new energy power generation device can include its output power and power fluctuations. Of course, the output information can also include its output current and current fluctuations; this invention does not limit this. Based on the output information of the new energy power generation device, the operating parameters of the hydrogen production system can be determined. For example, an increase in the output power of the new energy power generation device leads to an increase in the input power of the hydrogen production system, and a decrease in the output power leads to a decrease in the input power. Large fluctuations in the output power of the new energy power generation device result in large fluctuations in the input power of the hydrogen production system, while relatively stable fluctuations in the output power also result in relatively stable fluctuations in the input power of the hydrogen production system. This invention, based on the volatility and intermittency of the output of the new energy power generation device, controls the activation and deactivation of the electrolyzers in each hydrogen production unit within the hydrogen production system to ensure the safe and efficient operation of the hydrogen production system.

[0063] When controlling the switching on and off of the electrolyzer, the operating parameters and operational requirements of the hydrogen production system can be considered. The operating parameters of the hydrogen production system may include, but are not limited to, the input electrical parameters and their fluctuation characteristics. These input electrical parameters can be either the input power or the input current; the fluctuation characteristics can be either the input power or the input current fluctuation characteristics, which are not limited in this invention. The operational requirements of the hydrogen production system may include, but are not limited to, the system's standby thermal requirements and the limits on the number of times the electrolyzer can be switched on and off.

[0064] When determining the operating parameters of a hydrogen production system, the output information of the renewable energy power generation unit can be obtained based on its predicted output data. This output information can then be used to determine the system's operating parameters. For example, the output power and power fluctuations of the renewable energy power generation unit can be obtained from its power prediction curve. The input power of the hydrogen production system can then be determined based on this output power. The activation and deactivation modes of the hydrogen production units can be selected based on the input power, ensuring that the output of the renewable energy power generation unit matches the operating load of the hydrogen production system. Furthermore, selecting the activation and deactivation modes based on the output power fluctuations of the renewable energy power generation unit can improve the system's operating efficiency. Alternatively, the operating parameters can be determined based on the historical output data of the renewable energy power generation unit. This initial selection of the activation and deactivation modes allows for adjustments to the operating parameters based on the actual output data of the renewable energy power generation unit, thereby refining the activation and deactivation modes of the hydrogen production units.

[0065] When considering the hot standby requirements of a hydrogen production system, the system should operate as many hydrogen production units as possible to reduce the number of times the electrolyzer is switched on and off. This ensures the overall hydrogen production system is in hot standby mode, enabling rapid start-up of the electrolyzer and improving the energy utilization rate of the hydrogen production system. Reducing the number of times the electrolyzer is switched on and off also helps extend the lifespan of the electrolyzer.

[0066] This invention selects the input and output modes of the hydrogen production unit based on operating parameter information and operating demand information, adapting to the fluctuations and intermittent nature of the output of new energy power generation devices, which is beneficial to improving the operating efficiency of the hydrogen production system.

[0067] Optional, Figure 1 The preset mode in step 102 shown can include at least three input modes, which are as follows:

[0068] Input Mode 1: Simultaneously input all hydrogen production units of the hydrogen production system.

[0069] Input Mode 2: Input hydrogen production units into the hydrogen production system one by one.

[0070] Input Mode 3: At least two hydrogen production units are put into the hydrogen production system at the same time.

[0071] Regarding investment model one, such as Figure 2As shown in (a), when there is power or current input, for the sake of convenient description, power is taken as an example for illustration. All hydrogen production units of the hydrogen production system are put into operation. Each hydrogen production unit can operate at the first power limit P_limit1, which can be the lower limit of the operation of the hydrogen production unit and further can be the minimum operating power of the electrolyzer. The total number of hydrogen production units in the hydrogen production system is N. In this first input mode, all hydrogen production units are put into operation simultaneously, and the power of the hydrogen production system is N * P_limit1. As the power of the hydrogen production system increases, the power of each hydrogen production unit gradually increases, and the power of each hydrogen production unit can increase to no more than the rated power of the hydrogen production unit. The distribution of the power of the hydrogen production system by the hydrogen production units can be an average distribution or a weighted distribution, which is not limited here.

[0072] For the second input mode, as Figure 2 shown in (b), when there is power input, the hydrogen production units of the hydrogen production system are put into operation one by one. The hydrogen production unit that can be put into operation online first is put into operation. After this hydrogen production unit works to the second power limit P_limit2, the next hydrogen production unit is put into operation. Optionally, the second power limit P_limit2 is greater than the first power limit P_limit1. This second power limit can be the upper limit of the operation of the hydrogen production unit and further can be the optimal operating power of the electrolyzer. As the number of hydrogen production units put into operation increases, the power of the hydrogen production system gradually increases. When N1 hydrogen production units are put into operation, where N1 < N, and each hydrogen production unit operates at the second power limit P_limit2, the power of the hydrogen production system is N1 * P_limit2. When all the hydrogen production units in the hydrogen production system are put into operation one by one and each hydrogen production unit operates at the second power limit P_limit2, the power of the hydrogen production system is N * P_limit2.

[0073] For the third input mode, it can include two input methods: the first input method is to first put at least two hydrogen production units of the hydrogen production system into operation simultaneously and then put into operation one by one the hydrogen production units that have not been put into operation in the hydrogen production system; the second input method is to first put into operation one by one the hydrogen production units of the hydrogen production system and then put into operation simultaneously at least two hydrogen production units that have not been put into operation in the hydrogen production system. As Figure 2(c) illustrates the first activation method. When power is input, all N1 hydrogen production units of the hydrogen production system are activated. Each unit can operate at the first power limit P_limit1, at which point the system power is N1 * P_limit1. As the system power increases, the power of each unit gradually increases. When all N1 units reach the second power limit P_limit2, the system power is N1 * P_limit2. Then, the remaining unactivated units are activated one by one. After each newly activated unit reaches the second power limit P_limit2, the next unit is activated. When each unit operates at the second power limit P_limit2, the system power is N * P_limit2.

[0074] In an optional embodiment, the method for selecting the input mode based on the operating parameter information and operating demand information of the hydrogen production system includes:

[0075] The activation mode is selected based on the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system.

[0076] The input electrical parameters of the hydrogen production system can be either the hydrogen production input power or the hydrogen production input current; this invention does not limit the specific input parameters.

[0077] Improving the operating efficiency of a hydrogen production system can be achieved in two ways. First, it can meet the standby requirements of the hydrogen production system by maximizing the operation of hydrogen production units, enabling rapid start-up of the electrolyzer, improving the energy utilization rate of the hydrogen production system, and further enhancing its operating efficiency. Second, it can control the number of hydrogen production units put into operation. Under the condition of meeting the same input electrical parameters of the hydrogen production system, such as input power, the number of hydrogen production units put into operation can be reduced, so that the hydrogen production units put into operation operate within the optimal power range, improving the hydrogen production efficiency of the electrolyzer, and further enhancing the operating efficiency of the hydrogen production system.

[0078] This invention allows for the selection of hydrogen production unit activation modes based on the input electrical parameters and standby requirements of the hydrogen production system. When the input electrical parameters are high (e.g., high input power), a larger number of hydrogen production units are activated; when the input electrical parameters are low (e.g., low input power), a smaller number of hydrogen production units are activated. Furthermore, different activation modes can be selected based on whether or not there is a standby requirement for the hydrogen production system, thus meeting the operational efficiency requirements of the hydrogen production system.

[0079] As an optional implementation method, the activation mode is selected based on the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system, including:

[0080] When there is a hot standby requirement for the hydrogen production system, the input mode is selected from input mode one and input mode three according to the input electrical parameters of the hydrogen production system.

[0081] If there is no need for a hydrogen production system to be in standby mode, then the second mode of operation will be selected.

[0082] When considering the hot standby requirements of the hydrogen production system, the electrolyzer of the hydrogen production unit is in a hot standby state, which allows for rapid start-up and improves the operating efficiency of the hydrogen production system. Furthermore, the activation mode of the hydrogen production unit can be selected based on the input electrical parameters of the hydrogen production system, and the operating efficiency can be further improved by controlling the number of hydrogen production units activated. If the input electrical parameters of the hydrogen production system are large, a first number of hydrogen production units can be activated; if the input electrical parameters are small, a second number of hydrogen production units can be activated, where the first number is greater than the second number. Selecting the activation mode based on the input electrical parameters of the hydrogen production system can reduce the number of times the electrolyzer is switched on and off, extend the service life of the electrolyzer, and improve the hydrogen production efficiency of the electrolyzer.

[0083] Without considering the standby heat requirements of the hydrogen production system, the system can include multiple hydrogen production units, each of which can include an electrolyzer. In this case, heat does not need to be recycled. To improve the operating efficiency of the hydrogen production system, the number of hydrogen production units put into operation can be controlled. Furthermore, an operation mode two can be selected, such as... Figure 2 As shown in (b), the hydrogen production units of the hydrogen production system are put into operation one by one. This way, if the power of the hydrogen production system needs to be increased further after the operating power of one unit reaches the second power limit, another hydrogen production unit can be put into operation. Compared to putting multiple hydrogen production units into operation simultaneously, this method of putting into operation one by one can reduce the number of hydrogen production units while meeting the same input electrical parameters of the hydrogen production system, such as the input power, thereby improving the hydrogen production efficiency of the electrolyzer and further improving the operating efficiency of the hydrogen production system. Of course, if there is no need for the hydrogen production system to be in standby mode, mode two can be selected first, or mode three or mode one can be selected according to the actual operating conditions of the hydrogen production system; no restrictions are imposed here.

[0084] Optionally, an input mode can be selected from input mode one and input mode three based on the input electrical parameters of the hydrogen production system, including:

[0085] When the input electrical parameters of the hydrogen production system are greater than the preset input electrical parameters of the hydrogen production system, select the first mode of operation;

[0086] When the input electrical parameters of the hydrogen production system are not greater than the preset input electrical parameters of the hydrogen production system, select the third mode of operation.

[0087] When the ratio of the capacity of the new energy power generation unit to the capacity of the hydrogen production system is high, for example, when the output of the new energy power generation unit is at more than half the load of the hydrogen production system most of the time, then the first mode of operation can be selected, such as... Figure 2As shown in (a), all hydrogen production units of the hydrogen production system are put into operation. When the current input power of the hydrogen production system is more than 50% of the rated power, all hydrogen production units are in operation, which can quickly meet the hydrogen production requirements. Compared with some hydrogen production units being in operation, requiring additional hydrogen production units to meet the hydrogen production requirements, this can improve the overall operating efficiency of the hydrogen production system. Of course, when the input electrical parameters of the hydrogen production system are greater than the preset input electrical parameters, mode one can be selected first, or mode three or mode two can be selected according to the actual operating conditions of the hydrogen production system; there are no restrictions here.

[0088] When the ratio of the capacity of the new energy power generation unit to the capacity of the hydrogen production system is low, for example, when the output of the new energy power generation unit is below half the load of the hydrogen production system most of the time, then the third mode of operation can be selected, such as... Figure 2 As shown in (c), some hydrogen production units of the hydrogen production system are put into operation, and then the remaining units are put into operation one by one as the input power of the hydrogen production system increases. When the current input power of the hydrogen production system is less than 50% of the rated power, the operation of some hydrogen production units can quickly meet the hydrogen production requirements. Compared with putting all hydrogen production units into operation, this reduces the number of times the electrolyzer is turned on, extends the service life of the electrolyzer, and reduces the number of hydrogen production units put into operation while meeting the same input electrical parameters of the hydrogen production system, such as the input power of the hydrogen production system. This improves the operating efficiency of the electrolyzer and thus improves the overall operating efficiency of the hydrogen production system. Of course, when the input electrical parameters of the hydrogen production system are not greater than the preset input electrical parameters of the hydrogen production system, the third mode of operation can be selected first, or the first or second mode of operation can be selected according to the actual operating conditions of the hydrogen production system. There are no restrictions here.

[0089] Optional, Figure 1 The preset mode in step 102 shown can include at least two cutout modes, which are as follows:

[0090] Cut-off mode 1: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the first operating limit.

[0091] Cut-off mode 2: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the second operating limit.

[0092] The first operating limit is greater than the second operating limit.

[0093] For the first cutout mode, such as Figure 3As shown in (a), as the input electrical parameters of the hydrogen production system, such as input power or input current, decrease, for ease of description, the following explanation uses power as an example. The input power of the hydrogen production system falls below the first operating limit N*P_limit3, where N is the total number of hydrogen production units in the system. Thus, this first operating limit can also be the power value of the hydrogen production system when all hydrogen production units are running, or it can be the power value of the hydrogen production system when only some hydrogen production units are running. P_limit3 is the first operating power of the hydrogen production unit, which can be compared with... Figure 2 (b) The second power limit P_limit2 shown can be the same or different, depending on the minimum power limit of the electrolyzer in the hydrogen production unit and the actual operating conditions. When the input power of the hydrogen production system is in the range of [(N-1)*P_limit3, N*P_limit3], one hydrogen production unit is switched off. When the input power of the hydrogen production system is in the range of [(N-2)*P_limit3, (N-1)*P_limit3], another hydrogen production unit is switched off, until the input power of the hydrogen production system drops to 0.

[0094] For the second cutout mode, such as Figure 3 As shown in (b), as the input power decreases, the power of the hydrogen production system falls below the second operating limit N*P_limit4, where N is the total number of hydrogen production units in the system. Thus, this second operating limit can be the power value of the hydrogen production system when all hydrogen production units are running, or it can be the power value of the hydrogen production system when only some hydrogen production units are running. P_limit4 is the second operating power of the hydrogen production unit, which can be compared with... Figure 2 (a) The first power limit P_limit1 shown can be the same or different, depending on the minimum power limit of the electrolyzer in the hydrogen production unit and the actual operating conditions. The second operating limit N*P_limit4 < the first operating limit N*P_limit3. When the input power of the hydrogen production system is in the range [(N-1)*P_limit4, N*P_limit4], one hydrogen production unit is switched off. When the input power of the hydrogen production system is in the range [(N-2)*P_limit4, (N-1)*P_limit4], another hydrogen production unit is switched off, until the input power of the hydrogen production system drops to 0.

[0095] The difference between switch-out mode 1 and switch-out mode 2 is that switch-out mode 1 starts to switch out hydrogen production units one by one when the input power of the hydrogen production system is relatively high, such as when the input power of the hydrogen production system is 70% of the rated power of the hydrogen production system. On the other hand, switch-out mode 2 starts to switch out hydrogen production units one by one when the input power of the hydrogen production system is relatively low, such as when the input power of the hydrogen production system is 30% of the rated power of the hydrogen production system.

[0096] It should be noted that for cut-out mode 1 and cut-out mode 2, the hydrogen production units can be cut out one by one, such as Figure 3 (a) and Figure 3 (b), or some hydrogen production units can be cut out first and then the hydrogen production units can be cut out one by one, as shown in Figure 4 (a), that is, some hydrogen production units are cut out first, and the number of hydrogen production units is reduced from N to N2. At this time, the power of the hydrogen production system drops from N * P_limit3 to N2 * P_limit3, where N2 < N, and then the remaining hydrogen production units are cut out one by one. It can also be that some hydrogen production units are cut out, as shown in Figure 4 (b), that is, some hydrogen production units are cut out first, and the number of hydrogen production units is reduced from N to N3. At this time, the power of the hydrogen production system drops from N * P_limit3 to N3 * P_limit3. Then some hydrogen production units are cut out, and the number of hydrogen production units is reduced from N3 to N4. At this time, the power of the hydrogen production system drops from N3 * P_limit3 to N4 * P_limit3. Finally, some hydrogen production units are cut out, and the number of hydrogen production units is reduced from N4 to N5 until the power of the hydrogen production system drops to 0. Of course, it can also be cut out one by one first and then partially cut out, which will not be elaborated here.

[0097] In an optional embodiment, the method for selecting the cut-out mode according to the operation parameter information and operation demand information of the hydrogen production system includes:

[0098] Select the cut-out mode according to the fluctuation of the input electrical parameters of the hydrogen production system and the hot standby demand of the hydrogen production system.

[0099] The present invention can select the cut-out mode of the hydrogen production unit according to the fluctuation of the input electrical parameters of the hydrogen production system and the hot standby demand of the hydrogen production system. Optionally, the fluctuation of the input electrical parameters of the hydrogen production system can be the fluctuation of the input power of the hydrogen production system or the fluctuation of the input current of the hydrogen production system. When the input electrical parameters of the hydrogen production system fluctuate greatly, more hydrogen production units can be kept in operation to avoid frequent on-off operations of the electrolytic cell. When the input electrical parameters of the hydrogen production system fluctuate slightly, the hydrogen production units can be gradually cut out to improve the hydrogen production efficiency of the electrolytic cell. In addition, different cut-out modes can be selected according to whether there is a hot standby demand for the hydrogen production system to meet the operation efficiency requirements of the hydrogen production system.

[0100] As an optional implementation manner, selecting the cut-out mode according to the fluctuation of the input electrical parameters of the hydrogen production system and the hot standby demand of the hydrogen production system includes:

[0101] In the case where there is no hot standby demand for the hydrogen production system, if the difference between the input electrical parameters of the hydrogen production system at adjacent times is less than the first preset difference, then select cut-out mode 1.

[0102] Without considering the standby thermal requirements of the hydrogen production system, the system can include multiple hydrogen production units, each of which can include an electrolyzer. In this case, heat does not need to be recycled. To improve the operating efficiency of the hydrogen production system, the number of hydrogen production units switched off can be controlled. Furthermore, when the fluctuations in the input electrical parameters of the hydrogen production system are small, i.e., the difference between the input electrical parameters of the hydrogen production system at adjacent moments is less than a first preset difference, switch-off mode one can be selected, such as... Figure 3 As shown in (a), the hydrogen production unit is switched off when the input electrical parameters of the hydrogen production system drop to the first operating limit N*P_limit3, and when the input power drops to the first operating limit (N-1)*P_limit3. Compared to switching off when the input power drops to the second operating limit N*P_limit4, P_limit3>P_limit4, which improves the hydrogen production efficiency of the electrolyzer and further improves the operating efficiency of the hydrogen production system. Of course, in cases where there is no need for hot standby of the hydrogen production system and the input electrical parameters of the hydrogen production system do not fluctuate significantly, the first switching mode can be selected first, or the second switching mode can be selected according to the actual operating conditions of the hydrogen production system. Figure 4 (a) Figure 4 The cutout mode shown in (b) is not restricted here.

[0103] As another optional implementation, the cut-off mode is selected based on the fluctuation of the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system, including:

[0104] If the difference between the input electrical parameters of the hydrogen production system at adjacent times is greater than the second preset difference, then switchout mode two is selected when there is a hot standby requirement for the hydrogen production system.

[0105] When considering the hot standby requirements of the hydrogen production system, the electrolyzer of the hydrogen production unit is in a hot standby state, which can achieve rapid start-up and improve the operating efficiency of the hydrogen production system. Furthermore, when the input electrical parameters of the hydrogen production system fluctuate significantly, i.e., the difference between the input electrical parameters of the hydrogen production system at adjacent moments exceeds a second preset difference value, switchover mode two can be selected. This second preset difference value can be the same as the first preset difference value, or it can be different from the first preset difference value. For example... Figure 3As shown in (b), when the input electrical parameters of the hydrogen production system drop to the second operating limit N*P_limit4, the hydrogen production unit is switched off. Compared to switching off when the input power drops to the first operating limit N*P_limit3, P_limit3>P_limit4. This reduces the number of times the electrolyzer is switched on and off when the input electrical parameters of the hydrogen production system fluctuate significantly, such as when the input power or input current fluctuates significantly. This avoids frequent start-ups and shutdowns of the electrolyzer, improves the operating efficiency of the hydrogen production system, and helps extend the service life of the electrolyzer. Of course, in cases where there is a need for hot standby of the hydrogen production system and the input electrical parameters of the hydrogen production system fluctuate significantly, the second switching-off mode can be selected first. Alternatively, the first or second switching-off mode can be selected based on the actual operating conditions of the hydrogen production system. Figure 4 (a) Figure 4 The cutout mode shown in (b) is not restricted here.

[0106] As an optional embodiment, the hydrogen production system includes 15 hydrogen production units, each with 4 electrolyzers, each electrolyzer corresponding to a gas-liquid separator, and each unit producing 4000 Nm³ of hydrogen. 3 The hydrogen production unit has a rated power of 20MW and a total hydrogen production system capacity of 60,000 Nm³ / h. 3 The hydrogen production capacity is [h], and the rated power of the hydrogen production system is 300MW. This hydrogen production system has a thermal standby requirement. Based on the input electrical parameters of the hydrogen production system, such as the input power, the system selects the third mode of activation; based on the fluctuation of the input electrical parameters, such as the input power, the system selects the second mode of deactivation. For ease of description, the following explanation uses power as an example. A schematic diagram of the activation and deactivation of the hydrogen production unit of this system is shown below. Figure 5 As shown.

[0107] At the initial power input, such as 10% power input, at least one electrolyzer in each hydrogen production unit operates at approximately 80% of its rated power, ensuring the efficiency of a single electrolyzer. Through internal alkaline solution circulation within the hydrogen production unit, as many electrolyzers as possible are kept in a hot standby state. Therefore, with 8 hydrogen production units operating, each unit receives an equal share of the hydrogen production system input power, meaning each unit produces 750 Nm³ of hydrogen. 3 / h, with a power of 3.75MW.

[0108] As the input power of the hydrogen production system increases, when the input power exceeds (8*90%*20 / 300) = 48%, a new hydrogen production unit is put into operation. When the input power exceeds the product of the number of online hydrogen production units and 90% of the rated power of the hydrogen production units, a new set of hydrogen production units will be put into operation, and the input power of the hydrogen production system will be evenly distributed according to the number of hydrogen production units. For example, if the input power of the hydrogen production system exceeds (9*90%*20 / 300) = 54%, another set of hydrogen production units will be put into operation, for a total of 10 sets, each operating at a power of 16.2MW. This continues until all hydrogen production units are put into operation, each operating at 90% capacity. As the input power of the hydrogen production system increases, the input power of the hydrogen production system is evenly distributed among the hydrogen production units until each set of hydrogen production units is operating at full load.

[0109] As the input power of the hydrogen production system decreases, the input power of the hydrogen production system is evenly distributed among each hydrogen production unit until the operating power drops to 20% (at least one electrolyzer in 15 hydrogen production units is operating at 80% of its rated power). At this point, the hydrogen production unit is switched off until the input power of the hydrogen production system drops to 10%, and one electrolyzer in 8 hydrogen production units operates at 80% of its rated power, so that as many electrolyzers in the hydrogen production units as possible are in hot standby mode.

[0110] As can be seen from the above, setting a large hysteresis space for the hydrogen production unit's input and output limits can reduce frequent start-ups and shutdowns during power fluctuations, which is beneficial for extending the service life of the electrolyzer. At least one electrolyzer in the hydrogen production unit is in operation to ensure that the entire hydrogen production system is in hot standby mode, which is conducive to rapid start-up, improving the energy utilization rate of the hydrogen production system, and thus improving the operating efficiency of the hydrogen production system.

[0111] As another optional embodiment, the hydrogen production system includes four hydrogen production units, each with one electrolyzer, and each electrolyzer corresponds to a gas-liquid separator. The hydrogen production capacity of each hydrogen production unit is 1000 Nm³. 3 / h, the hydrogen production unit has a rated power of 5MW, and the total hydrogen production system has a capacity of 4000Nm. 3 With a hydrogen production capacity of / h and a total rated power of 20MW, the hydrogen production system does not have a hot standby requirement, so the second mode of operation is selected.

[0112] When the output power of the new energy power generation device fluctuates significantly, in order to reduce the number of times the electrolytic cell is switched on and off, switch-off mode two is selected, such as... Figure 6 As shown in (a).

[0113] At the initial power input, such as 20% power input, one electrolyzer is put into operation. As the input power of the hydrogen production system increases, when the hydrogen production power of the electrolyzer exceeds 90% of the rated power, a new electrolyzer is put into operation. When the input power of the hydrogen production system exceeds the product of the number of online hydrogen production units and 90% of the rated power, a new electrolyzer is put into operation. The input power of the hydrogen production system is evenly distributed according to the number of hydrogen production units. For example, if the input power of the hydrogen production system exceeds (2*90%*5 / 20) = 45%, another electrolyzer is put into operation, for a total of 3 units, each operating at 3MW. This continues until all electrolyzers are put into operation, each operating at 90% capacity. As the input power of the hydrogen production system increases, the input power of the hydrogen production system is evenly distributed among the electrolyzers until each electrolyzer is operating at full load.

[0114] As the input power of the hydrogen production system decreases, the input power of the hydrogen production system is shared equally among each electrolyzer until the input power of the hydrogen production system drops to 40% (each electrolyzer operates at 40% of its rated power). At this point, the electrolyzer is switched out, and the process continues until the input power of the hydrogen production system drops to 30%, at which point another electrolyzer is switched out.

[0115] As can be seen from the above, setting a large hysteresis limit for the hydrogen production unit input and output of the hydrogen production system can avoid frequent electrolyzer switching operations when there are large power fluctuations, which is conducive to extending the service life of the electrolyzer and improving the operating efficiency of the hydrogen production system.

[0116] When the output power of the new energy power generation device is relatively smooth and the output power fluctuation is small, select cutoff mode one, such as... Figure 6 As shown in (b).

[0117] At the initial power input, such as 20% power input, one electrolyzer is put into operation. As the input power of the hydrogen production system increases, when the hydrogen production power of the electrolyzer exceeds 90% of the rated power, a new electrolyzer is put into operation. When the input power of the hydrogen production system exceeds the product of the number of online hydrogen production units and 90% of the rated power, a new electrolyzer is put into operation. The input power of the hydrogen production system is evenly distributed according to the number of hydrogen production units. For example, if the input power of the hydrogen production system exceeds (2*4.5 / 20) = 45%, another electrolyzer is put into operation, for a total of 3 units, each operating at 3MW. This continues until all electrolyzers are put into operation, each operating at 90% capacity. As the input power of the hydrogen production system increases, the electrolyzers evenly distribute the input power until each hydrogen production unit is operating at full load.

[0118] As the input power of the hydrogen production system decreases, each electrolyzer shares the input power equally. When the input power drops to 65%, one electrolyzer is shut down, and the remaining input power is shared equally among the other electrolyzers, operating at 20*0.65 / 3 = 4.3MW. The hysteresis interval for each electrolyzer's activation and deactivation is set at 10%. When the input power drops to 42.5%, another electrolyzer is shut down, and so on.

[0119] As can be seen from the above, when the input is relatively smooth and there are no frequent power fluctuations, each electrolyzer operates in a high-load region with high operating efficiency, ensuring higher hydrogen production and improving the operating efficiency of the hydrogen production system.

[0120] The present invention also provides a hydrogen production system, comprising: a controller and at least one hydrogen production unit. The activation and deactivation of the hydrogen production unit are controlled by the controller; the controller is used to perform actions such as... Figure 1 The control method for the hydrogen production system is shown.

[0121] Optionally, the hydrogen production unit includes: at least one electrolyzer; the addition and removal of the electrolyzer are controlled by a controller. The electrolyzer can be switched on and off by the controller via a switch.

[0122] The hydrogen production unit also includes: at least one gas-liquid separator; each gas-liquid separator is connected to at least one electrolyzer.

[0123] The hydrogen production unit also includes: a hydrogen production power supply; the input end of the hydrogen production power supply is connected to a new energy power generation device, and the output end of the hydrogen production power supply is connected to an electrolyzer. The electrolyzer can also be switched on and off by a controller via the hydrogen production power supply.

[0124] like Figure 7 The diagram shown is a structural diagram of a hydrogen production system provided by the present invention. The hydrogen production system includes a controller ( Figure 7 (Not shown in the diagram) and multiple hydrogen production units, with the number of units being N. Each hydrogen production unit includes a hydrogen power supply unit, an electrolyzer unit, and a gas-liquid separation unit. A hydrogen power supply unit may include one or more hydrogen power sources, an electrolyzer unit may include one or more electrolyzers, and a gas-liquid separation unit may include one or more gas-liquid separators. One electrolyzer can correspond to one gas-liquid separator, and multiple electrolyzers can also correspond to one gas-liquid separator. One electrolyzer can correspond to one hydrogen power supply. The controller can disconnect the electrolyzer by cutting off the hydrogen power supply corresponding to it, and the controller can also connect the electrolyzer by turning on the hydrogen power supply corresponding to it. Of course, the connection and disconnection of the electrolyzer can also be achieved through an electrolyzer switch. Figure 7In this process, hydrogen production unit 1 includes hydrogen production power supply unit 1, electrolyzer unit 1, and gas-liquid separation unit 1; hydrogen production unit 2 includes hydrogen production power supply unit 2, electrolyzer unit 2, and gas-liquid separation unit 2; hydrogen production unit N includes hydrogen production power supply unit N, electrolyzer unit N, and gas-liquid separation unit N.

[0125] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes the element.

[0126] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0127] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of controlling a hydrogen production system, the method comprising: include: The operating parameters of the hydrogen production system are determined based on the output information of the new energy power generation device. The operating parameter information includes the input electrical parameters of the hydrogen production system and the fluctuation characteristics of the input electrical parameters of the hydrogen production system; Based on the operating parameter information and operating demand information of the hydrogen production system, the input mode and the output mode are selected from multiple preset modes of the hydrogen production unit of the hydrogen production system. The operational requirements information includes at least one of the following: the standby requirements of the hydrogen production system and the limit on the number of times the electrolyzer can be switched on and off. The preset mode includes: Operation Mode 1: Simultaneously operate all hydrogen production units of the hydrogen production system; Input Mode 2: Input hydrogen production units of the hydrogen production system one by one; Operation Mode 3: Simultaneously operate at least two hydrogen production units of the hydrogen production system; The preset mode also includes: Cut-off mode 1: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the first operating limit. Cut-off mode 2: The hydrogen production unit is cut off when the input electrical parameters of the hydrogen production system drop to the second operating limit. Wherein, the first operating limit is greater than the second operating limit.

2. The hydrogen production system control method according to claim 1, characterized by, The method for selecting an input mode based on the operating parameter information of the hydrogen production system and the operating demand information includes: The activation mode is selected based on the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system.

3. The hydrogen production system control method according to claim 2, characterized by, The step of selecting the operation mode based on the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system includes: When the hydrogen production system has a hot standby requirement, an input mode is selected from input mode one and input mode three according to the input electrical parameters of the hydrogen production system. In the absence of a hot standby requirement for the hydrogen production system, the second input mode is selected.

4. The hydrogen production system control method according to claim 3, characterized by, The step of selecting an input mode from input mode one and input mode three based on the input electrical parameters of the hydrogen production system includes: When the input electrical parameters of the hydrogen production system are greater than the preset input electrical parameters of the hydrogen production system, the first input mode is selected; When the input electrical parameters of the hydrogen production system are not greater than the preset input electrical parameters of the hydrogen production system, the third input mode is selected.

5. The hydrogen production system control method according to claim 1, wherein The method for selecting the cut-off mode based on the operating parameter information of the hydrogen production system and the operating demand information includes: The cut-off mode is selected based on the fluctuation of the input electrical parameters of the hydrogen production system and the standby thermal requirements of the hydrogen production system.

6. The hydrogen production system control method according to claim 5, wherein The step of selecting the cut-off mode based on the fluctuation of the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system includes: If the difference between the input electrical parameters of the hydrogen production system at adjacent times is less than a first preset difference, then the cut-out mode one is selected when there is no hot standby requirement for the hydrogen production system.

7. The hydrogen production system control method according to claim 5, characterized in that, The step of selecting the cut-off mode based on the fluctuation of the input electrical parameters of the hydrogen production system and the thermal standby requirements of the hydrogen production system includes: When the hydrogen production system has a hot standby requirement, if the difference in the input electrical parameters of the hydrogen production system at adjacent times is greater than a second preset difference, then the cut-out mode two is selected.

8. A hydrogen production system, characterized in that, include: Controller and at least one hydrogen production unit; The entry and exit of the hydrogen production unit are controlled by the controller; The controller is used to execute the hydrogen production system control method as described in any one of claims 1 to 7.

9. The hydrogen production system according to claim 8, characterized in that, The hydrogen production unit includes: At least one electrolytic cell; The insertion and removal of the electrolytic cell are controlled by the controller.

10. The hydrogen production system according to claim 9, characterized in that, The hydrogen production unit further includes: At least one gas-liquid separator; Each of the gas-liquid separators is connected to at least one of the electrolytic cells.

11. The hydrogen production system according to claim 9 or 10, characterized in that, The hydrogen production unit further includes: Hydrogen production power source; The input end of the hydrogen production power supply is connected to the new energy power generation device, and the output end of the hydrogen production power supply is connected to the electrolyzer.

Images