Microgrid-based hydrogen production control method and equipment and storage medium

Abstract

The invention discloses a micro-grid-based hydrogen production control method and device and a storage medium, and the micro-grid comprises a photovoltaic power generation system, an electrochemical energy storage system, a hydrogen fuel cell system and a water electrolysis hydrogen production system comprising a plurality of electrolytic cells. The current SOC value of the electrochemical energy storage system is combined to control the electrochemical energy storage system and / or the hydrogen fuel cell system to operate, and the multiple electrolytic cells are controlled to operate at the respective optimal operation power; when the current power generation power of the photovoltaic power generation system is not zero and is smaller than the sum of the optimal operation power of the plurality of electrolytic cells, the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system are combined to control the photovoltaic power generation system and the electrochemical energy storage system and / or the hydrogen fuel cell system to operate; and the multiple electrolytic cells are controlled to operate at the respective optimal operation power. The influence of photovoltaic power generation power fluctuation on stable operation of the electrolytic cell can be relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of microgrids, and in particular to a hydrogen production control method, device and storage medium based on a microgrid. Background Art

[0002] The use of photovoltaic power generation and hydrogen production technology in microgrids is currently an important research and application direction. However, photovoltaic power generation systems are easily affected by changes in the meteorological environment. For example, when dark clouds appear or it becomes dark at night, the photovoltaic power generation power is too low or even the photovoltaic power generation system stops generating power. At this time, the water electrolysis hydrogen production system as a load is difficult to adjust in time, which easily causes the electrolyzer in the water electrolysis hydrogen production system to start and stop frequently or cause impact on the electrolyzer, thereby affecting the service life of the electrolyzer. How to effectively suppress the impact of photovoltaic power fluctuations on the operation of the water electrolysis hydrogen production system is an urgent problem to be solved. Summary of the invention

[0003] The present invention provides a hydrogen production control method, device and storage medium based on a microgrid to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0004] In a first aspect, a hydrogen production control method based on a microgrid is provided, wherein the microgrid includes a photovoltaic power generation system, a water electrolysis hydrogen production system, an electrochemical energy storage system and a hydrogen fuel cell system, wherein the water electrolysis hydrogen production system includes a plurality of electrolyzers, and the method includes:

[0005] Obtaining the current power generation of the photovoltaic power generation system, the current SOC value of the electrochemical energy storage system, and the optimal operating power of each electrolyzer;

[0006] When the current power generation power of the photovoltaic power generation system is equal to zero, in combination with the current SOC value of the electrochemical energy storage system, the electrochemical energy storage system and / or the hydrogen fuel cell system are controlled to operate so as to supply power to the multiple electrolyzers, and at the same time, the multiple electrolyzers are controlled to operate at their respective optimal operating powers;

[0007] When the current power generation power of the photovoltaic power generation system is not equal to zero and is less than the sum of the optimal operating powers of the multiple electrolyzers, the photovoltaic power generation system is controlled to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system to supply power to the multiple electrolyzers, and at the same time, the multiple electrolyzers are controlled to operate at their respective optimal operating powers.

[0008] Further, the controlling the operation of the electrochemical energy storage system and / or the hydrogen fuel cell system in combination with the current SOC value of the electrochemical energy storage system includes:

[0009] When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the hydrogen fuel cell system to generate electricity;

[0010] When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, obtaining the current discharge power of the electrochemical energy storage system;

[0011] When the current discharge power of the electrochemical energy storage system is greater than or equal to the sum of the optimal operating powers of the multiple electrolytic cells, controlling the electrochemical energy storage system to discharge;

[0012] When the current discharge power of the electrochemical energy storage system is less than the sum of the optimal operating powers of the multiple electrolyzers, the electrochemical energy storage system is controlled to discharge, and the hydrogen fuel cell system is controlled to generate electricity.

[0013] Further, the controlling the photovoltaic power generation system to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system to operate in combination with the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system includes:

[0014] When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the photovoltaic power generation system to generate electricity, and controlling the hydrogen fuel cell system to generate electricity;

[0015] When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, obtaining the current discharge power of the electrochemical energy storage system;

[0016] When the sum of the current discharge power of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system is greater than or equal to the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate electricity and the electrochemical energy storage system is controlled to discharge;

[0017] When the sum of the current discharge power of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system is less than the sum of the optimal operating powers of the multiple electrolyzers, the photovoltaic power generation system is controlled to generate electricity, the electrochemical energy storage system is controlled to discharge, and the hydrogen fuel cell system is controlled to generate electricity.

[0018] Furthermore, the method further comprises:

[0019] When the current power generation power of the photovoltaic power generation system is not equal to zero and is greater than the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate power to supply power to the multiple electrolytic cells, and at the same time, the operating status of the multiple electrolytic cells is adjusted according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system.

[0020] Further, adjusting the operating states of the plurality of electrolytic cells according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system includes:

[0021] When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the multiple electrolytic cells to operate at their respective optimal operating powers;

[0022] When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, the first optimal operating power of a single electrolytic cell is determined according to the current power generation power of the photovoltaic power generation system, and then the multiple electrolytic cells are controlled to operate at the first optimal operating power.

[0023] Further, determining the first optimal operating power of a single electrolytic cell according to the current power generation power of the photovoltaic power generation system includes:

[0024] Determining the average power generation allowed to be allocated to a single electrolytic cell according to the current power generation of the photovoltaic power generation system;

[0025] When the average power generation is greater than the preset maximum operating power of a single electrolytic cell, the preset maximum operating power is used as the first optimal operating power;

[0026] When the average generated power is less than or equal to the preset maximum operating power, the average generated power is used as the first optimal operating power.

[0027] Furthermore, the method further comprises:

[0028] When the current power generation power of the photovoltaic power generation system is not equal to zero and is equal to the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate power to supply power to the multiple electrolytic cells, and at the same time, the multiple electrolytic cells are controlled to operate at their respective optimal operating powers.

[0029] Furthermore, the optimal operating power of any electrolyzer is obtained by:

[0030] Obtaining relevant operating parameters of the electrolytic cell in a historical time period, wherein the relevant operating parameters include the operating current and energy consumption per unit hydrogen production of the electrolytic cell at each historical sampling moment;

[0031] According to the relevant operating parameters, a fitting curve is generated to characterize the relationship between the operating current and the energy consumption per unit of hydrogen production, and then the minimum energy consumption per unit of hydrogen production is extracted from the fitting curve, and the operating current corresponding to the minimum energy consumption per unit of hydrogen production is used as the optimal operating current of the electrolyzer;

[0032] The optimal operating power of the electrolytic cell is determined according to the optimal operating current, rated current and rated power of the electrolytic cell.

[0033] In a second aspect, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the microgrid-based hydrogen production control method as described in the first aspect.

[0034] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the microgrid-based hydrogen production control method as described in the first aspect is implemented.

[0035] The present invention has at least the following beneficial effects: when the power provided by the photovoltaic power generation system is too low or the photovoltaic power generation system has no power, by obtaining additional power support from the electrochemical energy storage system and / or the hydrogen fuel cell system, multiple electrolyzers can operate according to their respective optimal operating powers, that is, multiple electrolyzers are controlled to always remain in the on state, thereby avoiding energy waste and structural damage caused by frequent start-stop actions of the electrolyzers; when the power provided by the photovoltaic power generation system is abundant, the current operating power of multiple electrolyzers is appropriately adjusted to maximize energy utilization. The present invention can effectively alleviate the impact of photovoltaic power fluctuations on the stable operation of multiple electrolyzers, and help to extend the service life of the electrolyzers. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0037] Figure 1 is a schematic diagram of the composition of a microgrid in an embodiment of the present invention;

[0038] Figure 2 is a flow chart of a hydrogen production control method based on a microgrid in an embodiment of the present invention;

[0039] Figure 3 It is a schematic diagram of the hardware structure of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that in the flowchart. The terms "first", "second", etc. in the specification and claims and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0043] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0044] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all content and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0045] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the composition of a microgrid provided in an embodiment of the present invention. The microgrid specifically includes an energy router, a DC bus, a hydrogen storage system, an ammonia cracking hydrogen production system, and a water electrolysis hydrogen production system, a photovoltaic power generation system, a hydrogen fuel cell system and an electrochemical energy storage system connected to the DC bus via the energy router. The DC bus is connected to an external AC bus via the energy router, the ammonia cracking hydrogen production system is connected to an external AC bus, the hydrogen storage system is connected to an external AC bus, the ammonia cracking hydrogen production system is connected to the hydrogen storage system, the water electrolysis hydrogen production system is connected to the hydrogen storage system, and the hydrogen storage system is connected to the hydrogen fuel cell system.

[0046] The water electrolysis hydrogen production system includes a plurality of electrolytic cells of the same type, and the electrolytic cell may be any one of a PEM (Proton Exchange Membrane) electrolytic cell, an alkaline electrolytic cell, a solid oxide electrolytic cell, etc., and the present invention does not impose any limitation on this.

[0047] Among them, the energy router includes a first DC / DC converter, a second DC / DC converter, a third DC / DC converter, a bidirectional DC / DC converter and a bidirectional DC / AC converter. The photovoltaic power generation system is connected to the DC bus through the first DC / DC converter, the water electrolysis hydrogen production system is connected to the DC bus through the second DC / DC converter, the hydrogen fuel cell system is connected to the DC bus through the third DC / DC converter, the electrochemical energy storage system is connected to the DC bus through the bidirectional DC / DC converter, and the DC bus is connected to the external AC bus through the bidirectional DC / AC converter; the energy router can realize electrical isolation, voltage conversion and bidirectional flow of electric energy, provide a "plug and play" standardized interface for sources and loads of different levels and forms, and can adjust the voltage and current of each converter in real time.

[0048] In practical applications, the photovoltaic power generation system uses the photovoltaic effect to convert the solar energy it captures into electrical energy. The electrical energy is directly incorporated into the DC bus after conversion by the first DC / DC converter, and can then be used to power the water electrolysis hydrogen production system. It can also be stored through the electrochemical energy storage system. The electrical energy provided by the DC bus is converted into a voltage level by the second DC / DC converter and then used to power the water electrolysis hydrogen production system for consumption. In addition, the hydrogen produced by the water electrolysis hydrogen production system during operation will be stored in the hydrogen storage system, and the hydrogen produced by the ammonia cracking hydrogen production system during operation will also be stored in the hydrogen storage system. Both the hydrogen storage system and the ammonia cracking hydrogen production system are connected by external The bidirectional DC / DC converter is used to convert the stored electric energy into electric energy, and then converts the electric energy into electric energy through a third DC / DC converter for voltage level conversion and then integrates it into the DC bus for compensation. The electric energy provided by the DC bus is converted into electric energy through a bidirectional DC / DC converter for voltage level conversion and then input into the electrochemical energy storage system for storage for consumption. The electrochemical energy storage system converts the stored electric energy into electric energy through a bidirectional DC / DC converter for voltage level conversion and then integrates it into the DC bus for compensation. The bidirectional DC / AC converter can be understood as a grid-connected port, which is used to realize AC / DC conversion and bidirectional flow of electric energy between the DC bus and the external AC bus.

[0049] It should be noted that microgrids can be deployed in industrial parks, residential communities, isolated power consumption sites, backup sites or other places.

[0050] On this basis, Figure 2 1 is a flow chart of a hydrogen production control method based on a microgrid provided by an embodiment of the present invention, the method comprising the following steps:

[0051] Step S110, obtaining the current power generation power of the photovoltaic power generation system, the current SOC value of the electrochemical energy storage system and the optimal operating power of each electrolyzer;

[0052] Step S120, determining whether the current power generation of the photovoltaic power generation system is equal to zero; if so, executing step S130; if not, executing step S140;

[0053] Step S130: combining the current SOC value of the electrochemical energy storage system, controlling the electrochemical energy storage system and / or the hydrogen fuel cell system to operate, so as to supply power to the plurality of electrolyzers, and controlling the plurality of electrolyzers to operate at their respective optimal operating powers;

[0054] Step S140, determining whether the current power generation of the photovoltaic power generation system is equal to the sum of the optimal operating powers of the multiple electrolytic cells; if so, executing step S150; if not, executing step S160;

[0055] Step S150, controlling the photovoltaic power generation system to generate electricity to supply power to the plurality of electrolytic cells, and controlling the plurality of electrolytic cells to operate at their respective optimal operating powers;

[0056] Step S160, determining whether the current power generation of the photovoltaic power generation system is less than the sum of the optimal operating powers of the multiple electrolytic cells; if so, executing step S170; if not, executing step S180;

[0057] Step S170, combining the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system, controlling the photovoltaic power generation system to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system to supply power to the multiple electrolyzers, and controlling the multiple electrolyzers to operate at their respective optimal operating powers;

[0058] Step S180, controlling the photovoltaic power generation system to generate electricity to supply power to the plurality of electrolytic cells, and adjusting the operating states of the plurality of electrolytic cells according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system.

[0059] In some embodiments, regarding the optimal operating power of any electrolytic cell mentioned in the above step S110, the corresponding acquisition process includes but is not limited to the following:

[0060] Step A1, obtaining relevant operating parameters of the electrolyzer in a historical time period, wherein the historical time period includes a number of historical sampling moments, and the relevant operating parameters include the energy consumption per unit hydrogen production and the operating current of the electrolyzer at each historical sampling moment;

[0061] Step A2, performing curve fitting on the relevant operating parameters to obtain a fitting curve for characterizing the functional relationship between the operating current and the energy consumption per unit hydrogen production;

[0062] Step A3, obtaining the minimum energy consumption per unit of hydrogen production from the fitting curve, and then defining the operating current corresponding to the minimum energy consumption per unit of hydrogen production as the optimal operating current of the electrolyzer;

[0063] Step A4: Calculate the optimal operating power of the electrolytic cell based on the rated power, rated current and optimal operating current of the electrolytic cell;

[0064] The ratio between the optimal operating power of the electrolytic cell and its rated power is equal to the ratio between the optimal operating current of the electrolytic cell and its rated current.

[0065] It should be noted that, considering the operational differences of each electrolyzer, the fitting curve generated for each electrolyzer is different, so the optimal operating current of each electrolyzer is different, and therefore the optimal operating power of each electrolyzer is also different. By using mathematical operations such as curve fitting, data extraction, and data proportional conversion, the optimal operating power of each electrolyzer can be determined more efficiently and reliably.

[0066] In some embodiments, regarding the control of the operation of the electrochemical energy storage system and / or the hydrogen fuel cell system in combination with the current SOC value of the electrochemical energy storage system mentioned in step S130, the corresponding implementation process includes but is not limited to the following:

[0067] Step S131, determining whether the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value; if so, controlling the hydrogen fuel cell system to generate electricity; if not, executing step S132;

[0068] Step S132, obtaining the current discharge power of the electrochemical energy storage system and determining whether it is greater than or equal to the sum of the optimal operating powers of multiple electrolyzers; if so, controlling the electrochemical energy storage system to discharge; if not, controlling the electrochemical energy storage system to discharge and controlling the hydrogen fuel cell system to generate electricity at the same time.

[0069] In the above step S131, since the current SOC value of the electrochemical energy storage system is less than the preset SOC lower limit value, while controlling the hydrogen fuel cell system to generate electricity, it is also necessary to control the electrochemical energy storage system to charge so that its SOC value gradually rises to a preset normal SOC range, and the normal SOC range is [SOC min ,SOC max ], SOC min is the preset SOC lower limit value, SOC max In order to preset the upper limit of SOC, considering that the electric energy required by the electrochemical energy storage system is also supplied by the hydrogen fuel cell system, the following operations should be performed before controlling the hydrogen fuel cell system to generate electricity:

[0070] The current SOH value of the hydrogen storage system is obtained and it is determined whether it is greater than or equal to the preset SOH lower limit value; if so, it means that the hydrogen storage system has sufficient hydrogen energy for the hydrogen fuel cell system to use, and no adjustment is required at this time; if not, the ammonia cracking hydrogen production system is controlled to produce hydrogen and the hydrogen produced will be transported to the hydrogen storage system until the SOH value of the hydrogen storage system rises to the preset normal SOH range, which is [SOH min ,SOH max ], SOH min is the preset SOH lower limit value, SOH max It is the preset SOH upper limit value.

[0071] In some embodiments, the above step S170 combines the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system to control the photovoltaic power generation system to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system. The corresponding implementation process includes but is not limited to the following:

[0072] Step S171, determining whether the current SOC value of the electrochemical energy storage system is less than the preset SOC lower limit value; if so, controlling the photovoltaic power generation system to continue to generate electricity, and then controlling the hydrogen fuel cell system to generate electricity; if not, executing step S172;

[0073] Step S172, obtaining the current discharge power of the electrochemical energy storage system and determining whether the sum of the current discharge power of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system is greater than or equal to the sum of the optimal operating powers of the multiple electrolytic cells; if so, controlling the photovoltaic power generation system to continue to generate electricity, and then controlling the electrochemical energy storage system to discharge; if not, controlling the photovoltaic power generation system to continue to generate electricity, and then controlling the electrochemical energy storage system to discharge, and at the same time controlling the hydrogen fuel cell system to generate electricity.

[0074] In the above step S171, since the current SOC value of the electrochemical energy storage system is less than the preset SOC lower limit value, while controlling the hydrogen fuel cell system to generate electricity, it is also necessary to control the electrochemical energy storage system to charge so that its SOC value gradually rises to the normal SOC range. Considering that the electric energy required by the electrochemical energy storage system is also supplied by the hydrogen fuel cell system, the following operations should be performed before controlling the hydrogen fuel cell system to generate electricity:

[0075] Obtain the current SOH value of the hydrogen storage system and determine whether it is greater than or equal to the preset SOH lower limit value; if so, it means that the hydrogen storage system has sufficient hydrogen energy for the hydrogen fuel cell system to use, and no adjustment is required at this time; if not, the ammonia cracking hydrogen production system is controlled to produce hydrogen and the hydrogen produced will be transported to the hydrogen storage system for storage until the SOH value of the hydrogen storage system rises to within the normal SOH range.

[0076] In some embodiments, the operation status of the plurality of electrolytic cells mentioned in the above step S180 is adjusted according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system, and the corresponding implementation process includes but is not limited to the following:

[0077] Step S181, determining whether the current SOC value of the electrochemical energy storage system is less than the preset SOC lower limit value; if so, controlling the multiple electrolytic cells to operate according to their respective optimal operating powers; if not, executing step S182;

[0078] Step S182: determine the first optimal operating power of a single electrolytic cell according to the current power generation power of the photovoltaic power generation system, and then control multiple electrolytic cells to operate at the first optimal operating power.

[0079] More specifically, the determination of the first optimal operating power of a single electrolytic cell mentioned in the above step S182 includes but is not limited to the following implementation process:

[0080] Step S182.1, determining the average power generation allowed to be allocated to a single electrolytic cell according to the current power generation of the photovoltaic power generation system;

[0081] Furthermore, the average power generation can be obtained by dividing the current power generation of the photovoltaic power generation system by the number of the plurality of electrolytic cells;

[0082] Step S182.2, determine whether the average generated power is greater than the preset maximum operating power of a single electrolytic cell; if so, use the preset maximum operating power as the first optimal operating power; if not, use the average generated power as the first optimal operating power.

[0083] In the above step S180, since the current power generation of the photovoltaic power generation system is greater than the sum of the optimal operating powers of the multiple electrolytic cells, that is, the photovoltaic power generation system has sufficient power supply, in order to maximize the energy utilization rate, while controlling the photovoltaic power generation system to generate electricity, the following operations can be performed:

[0084] Step B1, determining whether the current SOC value of the electrochemical energy storage system is less than the preset SOC upper limit value; if so, controlling the electrochemical energy storage system to charge, at which time the electric energy required by the electrochemical energy storage system is also supplied by the photovoltaic power generation system; if not, executing step B2 when the average power generation power is greater than the preset maximum operating power;

[0085] Step B2, determine whether the microgrid is currently connected to the grid; if so, transmit the excess power generated by the photovoltaic power generation system to the external AC bus; if not, obtain the current SOH value of the hydrogen storage system and when it is determined that it is less than the preset SOH lower limit, use the excess power generated by the photovoltaic power generation system to power the ammonia cracking hydrogen production system and the hydrogen storage system, so as to control the ammonia cracking hydrogen production system to produce hydrogen and the hydrogen produced by it will be transmitted to the hydrogen storage system for storage.

[0086] It should be noted that, in the present invention, it is preferably set that when the microgrid is in operation, the above-mentioned hydrogen production control method is executed every 30 minutes to regularly adjust the operation status of multiple electrolyzers.

[0087] In an embodiment of the present invention, when the power provided by the photovoltaic power generation system is too low or the photovoltaic power generation system has no power, by obtaining additional power support from the electrochemical energy storage system and / or the hydrogen fuel cell system, multiple electrolyzers can operate according to their respective optimal operating powers, that is, multiple electrolyzers are controlled to always remain in the on state, thereby avoiding energy waste and structural damage caused by frequent start-stop actions of the electrolyzers; when the power provided by the photovoltaic power generation system is abundant, the current operating power of multiple electrolyzers is appropriately adjusted to maximize energy utilization. The present invention can effectively alleviate the impact of photovoltaic power fluctuations on the stable operation of multiple electrolyzers, and help to extend the service life of the electrolyzers.

[0088] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, a microgrid-based hydrogen production control method in the above embodiment is implemented. Among them, the computer-readable storage medium includes but is not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM and magneto-optical disk), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. In other words, the storage device includes any medium that stores or transmits information in a readable form by a device (such as a computer, a mobile phone, etc.), which can be a read-only memory, a disk or an optical disk, etc.

[0089] also, Figure 32 is a schematic diagram of the hardware structure of a computer device provided in an embodiment of the present invention. The computer device includes a processor 220, a memory 230, an input unit 240, a display unit 250 and other devices. Those skilled in the art can understand that Figure 3 The device structure device shown does not constitute a limitation on all devices, and may include more or fewer components than shown, or combine certain components. The memory 230 can be used to store the computer program 210 and various functional modules, and the processor 220 runs the computer program 210 stored in the memory 230, thereby executing various functional applications and data processing of the device. The memory can be an internal memory or an external memory, or include an internal memory and an external memory. The internal memory may include a read-only memory (ROM), a programmable ROM (PROM), an electrically programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a flash memory, or a random access memory. The external memory may include a hard disk, a floppy disk, a U disk, a magnetic tape, etc. The memory 230 disclosed in the embodiment of the present invention includes but is not limited to the above-mentioned types of memory. The memory 230 disclosed in the embodiment of the present invention is only an example and not a limitation.

[0090] The input unit 240 is used to receive the input of the signal and the keyword input by the user. The input unit 240 may include a touch panel and other input devices. The touch panel can collect the user's touch operation on or near it (such as the user's operation on or near the touch panel using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program; other input devices may include but are not limited to one or more of a physical keyboard, a function key (such as a playback control key, a switch key, etc.), a trackball, a mouse, a joystick, etc. The display unit 250 can be used to display the information input by the user or the information provided to the user and various menus of the terminal device. The display unit 250 can be in the form of a liquid crystal display, an organic light emitting diode, etc. The processor 220 is the control center of the terminal device, which uses various interfaces and lines to connect various parts of the entire device, and executes various functions and processes data by running or executing software programs and / or modules stored in the memory 230, and calling data stored in the memory 230.

[0091] As an embodiment, the computer device includes a processor 220, a memory 230 and a computer program 210, wherein the computer program 210 is stored in the memory 230 and is configured to be executed by the processor 220, and the computer program 210 is configured to execute a microgrid-based hydrogen production control method in the above-mentioned embodiment.

[0092] The terms "including" and "having" and any variations thereof in the specification of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0093] In the present application, it should be understood that "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0094] Although the present application has been described in considerable detail and specifically with respect to several of the above-mentioned embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be considered to be effectively covered by the intended scope of the present application by referring to the appended claims and taking into account the prior art to provide a broad possible interpretation for these claims. In addition, the present application is described above with the embodiments foreseeable by the inventor for the purpose of providing a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A hydrogen production control method based on a microgrid, wherein the microgrid includes a photovoltaic power generation system, a water electrolysis hydrogen production system, an electrochemical energy storage system and a hydrogen fuel cell system, wherein the water electrolysis hydrogen production system includes a plurality of electrolyzers, characterized in that: The method comprises: Obtaining the current power generation of the photovoltaic power generation system, the current SOC value of the electrochemical energy storage system, and the optimal operating power of each electrolyzer; When the current power generation power of the photovoltaic power generation system is equal to zero, in combination with the current SOC value of the electrochemical energy storage system, the electrochemical energy storage system and / or the hydrogen fuel cell system are controlled to operate so as to supply power to the multiple electrolyzers, and at the same time, the multiple electrolyzers are controlled to operate at their respective optimal operating powers; When the current power generation power of the photovoltaic power generation system is not equal to zero and is less than the sum of the optimal operating powers of the multiple electrolyzers, the photovoltaic power generation system is controlled to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system to supply power to the multiple electrolyzers, and at the same time, the multiple electrolyzers are controlled to operate at their respective optimal operating powers.

2. The microgrid-based hydrogen production control method according to claim 1, characterized in that: The controlling the operation of the electrochemical energy storage system and / or the hydrogen fuel cell system in combination with the current SOC value of the electrochemical energy storage system comprises: When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the hydrogen fuel cell system to generate electricity; When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, obtaining the current discharge power of the electrochemical energy storage system; When the current discharge power of the electrochemical energy storage system is greater than or equal to the sum of the optimal operating powers of the multiple electrolytic cells, controlling the electrochemical energy storage system to discharge; When the current discharge power of the electrochemical energy storage system is less than the sum of the optimal operating powers of the multiple electrolyzers, the electrochemical energy storage system is controlled to discharge, and the hydrogen fuel cell system is controlled to generate electricity.

3. The microgrid-based hydrogen production control method according to claim 1, characterized in that: The controlling the photovoltaic power generation system to cooperate with the electrochemical energy storage system and / or the hydrogen fuel cell system to operate in combination with the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system comprises: When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the photovoltaic power generation system to generate electricity, and controlling the hydrogen fuel cell system to generate electricity; When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, obtaining the current discharge power of the electrochemical energy storage system; When the sum of the current discharge power of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system is greater than or equal to the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate electricity and the electrochemical energy storage system is controlled to discharge; When the sum of the current discharge power of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system is less than the sum of the optimal operating powers of the multiple electrolyzers, the photovoltaic power generation system is controlled to generate electricity, the electrochemical energy storage system is controlled to discharge, and the hydrogen fuel cell system is controlled to generate electricity.

4. The microgrid-based hydrogen production control method according to claim 1, characterized in that: The method further comprises: When the current power generation power of the photovoltaic power generation system is not equal to zero and is greater than the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate power to supply power to the multiple electrolytic cells, and at the same time, the operating status of the multiple electrolytic cells is adjusted according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system.

5. The microgrid-based hydrogen production control method according to claim 4, characterized in that: The step of adjusting the operating states of the plurality of electrolytic cells according to the current SOC value of the electrochemical energy storage system and the current power generation power of the photovoltaic power generation system comprises: When the current SOC value of the electrochemical energy storage system is less than a preset SOC lower limit value, controlling the multiple electrolytic cells to operate at their respective optimal operating powers; When the current SOC value of the electrochemical energy storage system is greater than or equal to the preset SOC lower limit value, the first optimal operating power of a single electrolytic cell is determined according to the current power generation power of the photovoltaic power generation system, and then the multiple electrolytic cells are controlled to operate at the first optimal operating power.

6. The microgrid-based hydrogen production control method according to claim 5, characterized in that: Determining the first optimal operating power of a single electrolytic cell according to the current power generation power of the photovoltaic power generation system comprises: Determining the average power generation allowed to be allocated to a single electrolytic cell according to the current power generation of the photovoltaic power generation system; When the average power generation is greater than the preset maximum operating power of a single electrolytic cell, the preset maximum operating power is used as the first optimal operating power; When the average generated power is less than or equal to the preset maximum operating power, the average generated power is used as the first optimal operating power.

7. The microgrid-based hydrogen production control method according to claim 1, characterized in that: The method further comprises: When the current power generation power of the photovoltaic power generation system is not equal to zero and is equal to the sum of the optimal operating powers of the multiple electrolytic cells, the photovoltaic power generation system is controlled to generate power to supply power to the multiple electrolytic cells, and at the same time, the multiple electrolytic cells are controlled to operate at their respective optimal operating powers.

8. The microgrid-based hydrogen production control method according to claim 1, characterized in that: The optimum operating power for any electrolyzer is obtained by: Obtaining relevant operating parameters of the electrolytic cell in a historical time period, wherein the relevant operating parameters include the operating current and energy consumption per unit hydrogen production of the electrolytic cell at each historical sampling moment; According to the relevant operating parameters, a fitting curve is generated to characterize the relationship between the operating current and the energy consumption per unit of hydrogen production, and then the minimum energy consumption per unit of hydrogen production is extracted from the fitting curve, and the operating current corresponding to the minimum energy consumption per unit of hydrogen production is used as the optimal operating current of the electrolyzer; The optimal operating power of the electrolytic cell is determined according to the optimal operating current, rated current and rated power of the electrolytic cell.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: The processor executes the computer program to implement the microgrid-based hydrogen production control method according to any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the microgrid-based hydrogen production control method according to any one of claims 1 to 8 is implemented.

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