Electrolytic hydrogen production coupling energy system

Abstract

The utility model provides an electrolytic hydrogen production coupling energy system, and belongs to the technical field of renewable energy hydrogen production, the electrolytic hydrogen production coupling energy system provided by the embodiment of the utility model comprises a power generation module, an energy storage module, a hydrogen production and storage module and an energy management system, the power generation module is electrically connected with the energy storage module, and the energy management system is electrically connected with the energy storage module. Electric energy generated and output by the power generation module is stored through the energy storage battery; the energy management system is connected with the energy storage battery through a network cable, and the hydrogen production and storage module is connected with the energy management system through a network cable or a network communication protocol, so that after the energy management system performs data real-time monitoring and energy management on energy flowing through the system, electric energy is distributed to the energy storage module, the hydrogen production and storage module and an alternating current power grid; the power generation module, the energy storage battery and the converter cooperatively supply power to the hydrogen production and storage module through the direct-current bus to balance and restrain electric energy fluctuation of direct power supply of the power generation module, and stable operation of the hydrogen production and storage module is guaranteed.

Description

Technical Field

[0001] This application belongs to the field of renewable energy hydrogen production technology, specifically relating to an electrolysis hydrogen production coupled energy system. Background Technology

[0002] The production of hydrogen through water electrolysis using renewable energy sources such as photovoltaics and wind power to replace the production of hydrogen through reforming of fossil fuels has great development potential. It can utilize water and low-carbon electricity to produce clean energy carriers, significantly improve energy efficiency, and provide an effective way for the decarbonization of the entire industry, including transportation, manufacturing, and agriculture.

[0003] Using renewable energy sources such as solar and wind power to produce hydrogen not only converts fluctuating renewable energy into chemical energy for storage, but also produces truly clean "green hydrogen," which has broad development prospects. However, renewable energy power generation is intermittent and random, and existing renewable energy power generation systems cannot guarantee the continuity and stability of power supply, which will have a certain impact on hydrogen production equipment and affect the operational stability, efficiency, and service life of the water electrolysis hydrogen production system. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] In view of this, an electrolysis-based hydrogen production coupled energy system is proposed according to an embodiment of this application, comprising:

[0006] A power generation module is used to generate electricity.

[0007] The energy storage module is electrically connected to the power generation module. The energy storage module includes an energy storage battery, which stores the electrical energy output by the power generation module and supplies power to the hydrogen production and storage module.

[0008] Hydrogen production and storage module, which is electrically connected to energy storage module;

[0009] The energy management system is connected to the energy storage battery via a network cable, and to the hydrogen production and storage module via a network cable or network communication protocol. The energy management system allocates at least the electrical energy stored in the energy storage battery to the hydrogen production and storage module.

[0010] In one feasible implementation, the energy management system is integrated into the energy storage battery management system, and the energy management system collects data from the power generation module, energy storage module, and hydrogen production and storage module in real time.

[0011] In one feasible implementation, the energy storage module further includes:

[0012] The maximum power point tracking device (MPPT) is electrically connected to the generator module. The MPPT tracks and agitates the power output of the generator module. The MPPT is also connected to the energy management system via a network cable or network communication protocol.

[0013] The DC bus is electrically connected to the output of the maximum power point tracking device and to the input of the energy storage battery, enabling bidirectional power transfer between the DC bus and the energy storage battery.

[0014] In one feasible implementation, the hydrogen production and storage module includes:

[0015] The electrolytic cell is electrically connected to the DC bus and connected to the energy management system via a network cable or network communication protocol. The electrolytic cell uses DC current to electrolyze water to produce hydrogen and oxygen.

[0016] Auxiliary equipment, which is electrically connected to the electrolytic cell, separates, purifies, and dries the hydrogen and oxygen produced by electrolysis in the electrolytic cell;

[0017] The hydrogen storage device has its collection port connected to the hydrogen outlet of the electrolyzer auxiliary equipment. The hydrogen storage device collects the hydrogen after it has been processed by the electrolyzer auxiliary equipment.

[0018] In one feasible implementation, the hydrogen production and storage module further includes:

[0019] The converter has its input terminal electrically connected to the DC bus and its output terminal electrically connected to the electrolytic cell. The converter is connected to the energy management system via a network cable or network communication protocol.

[0020] In one feasible implementation, the hydrogen production and storage module further includes:

[0021] The converter is electrically connected to the DC bus to convert DC power into AC power. The converter is connected to the energy management system via a network cable.

[0022] In one feasible implementation, the electrolytic hydrogen production coupled energy system further includes:

[0023] The AC power grid is connected to the first output terminal of the converter.

[0024] Electrical equipment, the input end of which is electrically connected to the output end of the AC power grid so that the AC power grid can supply power to the electrical equipment.

[0025] In one feasible implementation, the input terminal of the auxiliary device is electrically connected to the second output terminal of the converter to supply power to the auxiliary device.

[0026] In one feasible implementation, the maximum power point tracking device, DC bus, energy storage battery, energy management system and converter are integrated into the first enclosure to form an energy storage module.

[0027] In one feasible implementation, the power generation module includes photovoltaic modules, which are connected in series to form photovoltaic strings, and the photovoltaic strings are connected in parallel to form an array. The array is electrically connected to a maximum power point tracking device, which performs maximum power point tracking on the electrical energy output by the array.

[0028] Each of the square arrays corresponds one-to-one with a maximum power point tracking device.

[0029] The electrolytic hydrogen production coupled energy system of this application has the following advantages compared with the prior art:

[0030] The electrolytic hydrogen production coupled energy system provided in this application includes a power generation module, an energy storage module, a hydrogen production and storage module, and an energy management system. The power generation module is electrically connected to the energy storage module to store the electrical energy output by the power generation module through the energy storage battery. The energy management system is connected to the energy storage battery through a network cable, and the hydrogen production and storage module is connected to the energy management system through a network cable or a network communication protocol. After real-time data monitoring and energy management of the energy flowing through the system, the energy management system distributes electrical energy to the hydrogen production and storage module. The power generation module, energy storage battery, and converter work together to supply power to the hydrogen production and storage module through the DC bus to balance and suppress the power fluctuations directly supplied by the power generation module, ensuring the stable operation of the hydrogen production and storage module. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 A schematic diagram of an electrolytic hydrogen production coupled energy system according to an embodiment of this application;

[0033] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0034] 10. Power generation module; 11. Energy storage battery; 12. Hydrogen production and storage module; 13. Energy management system; 14. Maximum power point tracking device; 15. DC bus; 17. Converter; 18. AC power grid; 19. Electrical equipment; 21. First enclosure; 22. Second enclosure;

[0035] 121. Electrolyzer; 122. Hydrogen storage device; 123. Auxiliary equipment; 124. Converter. Detailed Implementation

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0040] like Figure 1 As shown in the embodiments of this application, an electrolytic hydrogen production coupled energy system is proposed, comprising: a power generation module 10, an energy storage module, a hydrogen production and storage module 12, and an energy management system 13; the power generation module 10 is used to generate electricity; the energy storage module is electrically connected to the power generation module 10, and the energy storage module includes an energy storage battery 11, which stores the electrical energy output by the power generation module 10 and supplies power to the hydrogen production and storage module 12 and the AC power grid 18; the hydrogen production and storage module 12 is electrically connected to the energy storage module; the energy management system 13 is connected to the energy storage battery 11 via a network cable, and the energy management system 13 is connected to the hydrogen production and storage module 12 via a network cable or a network communication protocol, and the energy management system 13 at least distributes the electrical energy stored in the energy storage battery 11 to the hydrogen production and storage module 12.

[0041] The electrolytic hydrogen production coupled energy system provided in this application includes a power generation module 10, an energy storage module, a hydrogen production and storage module 12, and an energy management system 13. The power generation module 10 is electrically connected to the energy storage module to store the electrical energy output by the power generation module 10 through the energy storage battery 11. The energy management system 13 is connected to the energy storage battery 11 via a network cable. The hydrogen production and storage module 12 is connected to the energy management system 13 via a network cable or a network communication protocol. After real-time data monitoring and energy management of the energy flowing through the system, the energy management system 13 distributes electrical energy to the hydrogen production and storage module 12, the energy storage module, and the AC power grid 18. The power generation module 10, the energy storage battery 11, and the converter 17 work together to supply power to the hydrogen production and storage module 12 through the DC bus 15 to balance and suppress the power fluctuations directly supplied by the power generation module 10, ensuring the stable operation of the hydrogen production and storage module 12.

[0042] It is understandable that a wired connection is used to establish a communication link between devices on a network, while a wireless connection is used to establish a communication link between devices on a network. The method of establishing communication can be selected according to the actual working conditions of the system.

[0043] In some examples, the power generation module 10 includes, but is not limited to, natural energy power generation systems such as photovoltaic power generation systems, wind power generation systems, and hydropower generation systems. As a preferred embodiment, the power generation module 10 is a photovoltaic power generation system, which includes photovoltaic modules that generate electricity based on the photoelectric effect to supply power.

[0044] As a preferred option, the energy storage battery 11 uses lithium iron phosphate batteries, which are safe, have a long lifespan, and are low in cost.

[0045] like Figure 1 As shown, in one feasible implementation, the energy management system 13 is integrated on the management system of the energy storage battery 11, and the energy management system 13 collects data from the power generation module 10, the energy storage module and the hydrogen production and storage module 12 in real time.

[0046] In this technical solution, the energy management system 13 is integrated into the management system of the energy storage battery 11, which not only reduces the complexity of data collection and interaction of the energy management system 13, but also reduces the complexity and cost of the electrolytic hydrogen production coupled energy system.

[0047] Furthermore, the energy management system 13 adopts an EMS system. By configuring software functions in the EMS and customizing, developing, and setting the same communication protocol as the management system of the energy storage battery 11, the energy management system 13 integrates the management system (BMS) function of the energy storage battery 11. This allows the energy management strategy, real-time energy monitoring, and historical data recording to be run through the EMS system. This not only improves the flexibility of data interaction but also eliminates the need for a separate host computer. It reduces the complexity of data interaction, as well as the complexity and investment cost of the entire system, thus saving on the overall energy system construction cost.

[0048] like Figure 1 As shown, in one feasible embodiment, the electrolytic hydrogen production coupled energy system further includes: a maximum power point tracking device 14 and a DC bus 15; the input terminal of the maximum power point tracking device 14 is electrically connected to the power generation module 10, the maximum power point tracking device 14 tracks and agitates the power of the electrical energy output by the power generation module 10, and the maximum power point tracking device 14 is connected to the energy management system 13 via a network cable; the DC bus 15 is electrically connected to the output terminal of the maximum power point tracking device 14, the DC bus 15 is electrically connected to the input terminal of the energy storage battery 11, and bidirectionally transmits electrical energy between the DC bus 15 and the energy storage battery 11.

[0049] In this technical solution, after the power generation module 10 outputs electrical energy, it is transmitted to the DC bus 15 after being tracked by the maximum power point tracking device 14. The maximum power point tracking device 14 is connected to the energy management system 13 via a network cable so that the energy management system 13 can monitor the maximum power point tracking device 14. The energy storage battery 11 is directly connected to the DC bus 15 so as to store the remaining electrical energy output by the DC bus 15. The DC off-grid power supply reduces the loss of the hydrogen production and storage module 12 and improves the overall efficiency and reliability of the system.

[0050] Furthermore, the output voltage of the power generation module 10 is matched with the voltage of the DC bus 15, which is set based on the energy storage battery 11 to obtain a more stable DC bus 15 voltage and maintain a more stable DC voltage output.

[0051] like Figure 1 As shown, in one feasible embodiment, the hydrogen production and storage module 12 includes: an electrolyzer 121, auxiliary equipment 123, a converter 124, and a hydrogen storage device 122; the electrolyzer 121 is directly electrically connected to the DC bus 15 or electrically connected to the DC bus 15 through the converter 124, and the electrolyzer 121 electrolyzes water to produce hydrogen and oxygen; the collection port of the hydrogen storage device 122 is connected to the hydrogen outlet after being processed by the auxiliary equipment 123, and the hydrogen storage device 122 collects the hydrogen after being processed by the auxiliary equipment 123.

[0052] In this technical solution, the electrolyzer 121 uses the electrical energy generated by the power generation module 10, the electrical energy from the energy storage battery 11, or the electrical energy from the AC power grid 18 to electrolyze water to produce hydrogen. The hydrogen produced by the electrolyzer 121 is stored by the hydrogen storage device 122, which produces and stores hydrogen on-site to save the cost of long-distance hydrogen transportation.

[0053] Understandably, the hydrogen produced by the electrolyzer 121 is purified and refined by auxiliary devices before being fed into the hydrogen storage device 122 at the back end to ensure the quality of hydrogen storage and facilitate subsequent use.

[0054] As a preferred option, the hydrogen storage device 122 adopts solid-state hydrogen storage of metal hydrides, which has high hydrogen storage density, high safety and reusability, and can efficiently adsorb, store and release hydrogen.

[0055] In some examples, the hydrogen storage device 122 includes, but is not limited to, solid-state hydrogen storage devices and liquid-state hydrogen storage devices. As a preferred embodiment, the hydrogen storage device 122 adopts a solid-state hydrogen storage device, which has high hydrogen storage density, high safety, and reusability, so as to efficiently adsorb, store, and release hydrogen.

[0056] In some examples, electrolyzer 121 includes, but is not limited to, PEM electrolyzers and alkaline electrolyzers. As a preferred option, electrolyzer 121 uses a proton exchange membrane electrolyzer (PEM) for hydrogen production. Compared to commonly used alkaline electrolyzers, it has a shorter response time, allows for rapid start-up and shutdown, and is more suitable for matching photovoltaic power generation systems. Specifically, electrolyzer 121 selects a PEM electrolyzer capable of starting within 10% to 150% of its rated power, providing higher responsiveness to fluctuations in the photovoltaic power generation system.

[0057] Specifically, the maximum power point tracking device 14 adopts a DC maximum power point tracking device (DC MPPT).

[0058] like Figure 1 As shown, in one feasible embodiment, the electrolytic hydrogen production coupled energy system further includes: a converter 124; the input terminal of the converter 124 is electrically connected to the DC bus 15, the output terminal of the converter 124 is electrically connected to the electrolytic cell 121, and the converter 124 is connected to the energy management system 13 via a network cable or network communication protocol.

[0059] In this technical solution, the electrolyzer 121 is connected to the DC bus 15 via a converter 124 to change the voltage of the DC bus 15, transforming the voltage to a range suitable for the electrolyzer 121. This allows the power generation module 10, the energy storage battery 11, and the AC grid 18 to work together to supply power to the electrolyzer 121 through the DC bus 15. Specifically, the power generation module 10 prioritizes powering the electrolyzer 121; when the power generation of the power generation module 10 is insufficient, the energy storage battery 11 can also directly supply power to the electrolyzer 121; and when the power generation of the power generation module 10 is insufficient and the energy storage capacity of the energy storage battery 11 is insufficient, the AC grid 18 can also directly supply power to the electrolyzer 121 through the converter 17. These multiple safeguards ensure the stable operation of hydrogen production in the electrolyzer 121. Using the converter 17 in conjunction with the DC bus 15 for off-grid hydrogen production eliminates multiple power conversion processes such as inversion, boosting, and rectification, reducing system losses and improving the system's power utilization efficiency.

[0060] Understandably, the Energy Management System (EMS) is integrated into the Battery Management System (BMS). It not only has the functions of a BMS, but can also collect and interact with data from units such as the Maximum Power Point Tracking Device (MPPT) 14, Energy Storage Battery (EPS) 11, Converter 17, Converter 124, and Electrolyzer 121 in real time, thereby realizing functions such as system operation energy management strategy, real-time monitoring of energy data, and recording of historical data.

[0061] In some examples, the number of converters 124 can be increased or decreased according to the DC bus 15 voltage. Voltage transformation can be achieved through single-stage transformation or multi-stage transformation.

[0062] Specifically, converter 124 uses a DC / DC converter.

[0063] like Figure 1 As shown, in one feasible implementation, the electrolytic hydrogen production coupled energy system further includes: a converter 17 and an AC power grid 18; the input terminal of the converter 17 is electrically connected to the DC bus 15, the converter 17 is a bidirectional converter 17, which can convert DC power to AC power and vice versa, and the converter 17 is connected to the energy management system 13 via a network cable; the input terminal of the AC power grid 18 is electrically connected to the first output terminal of the converter 17.

[0064] In this technical solution, the converter 17 is directly connected to the DC bus 15, which can convert DC power into AC power. The AC power is then connected to the AC power grid 18 to supply power to other AC power equipment 19 in the power generation system, thereby realizing the effective utilization and distribution of electrical energy.

[0065] In this technical solution, the converter 17 is directly connected to the DC bus 15, and can also convert AC power to DC power. The AC power comes from the AC power grid 18 so that when the power generation module 10 and the energy storage module are both insufficient, it can provide power for the operation of the electrolytic cell 121.

[0066] In this technical solution, the electrical energy converted by the power generation module 10 is directly supplied to the hydrogen production and storage module 12, which can be started at a lower power. The remaining electrical energy can be stored in the energy storage battery 11. If there is still excess electrical energy after the energy storage battery 11 is full, the power output from the DC bus 15 can be converted by the converter 17 and supplied to the AC grid 18 and the electrical equipment 19. Through the multi-module design and the power matching design between modules, it is further ensured that the sunlight can be fully utilized during both periods of strong and weak sunlight, effectively avoiding the phenomena of "wasted solar power" and "wasted electricity".

[0067] In some examples, converter 17 can be a unidirectional converter or a bidirectional converter. As a preferred option, converter 17 is a bidirectional DC / AC type PCS converter.

[0068] like Figure 1 As shown, in one feasible implementation, the electrolytic hydrogen production coupled energy system further includes: an AC power grid 18 and an electrical device 19; the input terminal of the AC power grid 18 is electrically connected to the first output terminal of the converter 17; the input terminal of the electrical device 19 is electrically connected to the output terminal of the AC power grid 18, so as to supply power to the electrical device 19 through the AC power grid 18.

[0069] In this technical solution, the electrical equipment 19 is connected to the AC power grid 18, and the power generation module 10 directly supplies power to AC load equipment such as temperature control and lighting, effectively utilizing system power, reducing system losses, and improving the system power utilization efficiency.

[0070] In this technical solution, by setting up a DC bus 15 and connecting the energy storage battery 11, the electrical equipment 19 and the hydrogen production and storage module 12 to the DC bus 15, the energy management system 13 couples the main power units to work together to smooth the fluctuations of the power generation module 10. Compared with relying solely on the energy storage battery 11, this can better suppress the adverse effects of the fluctuations in photovoltaic power generation, thereby ensuring the overall stable operation of the energy system.

[0071] like Figure 1 As shown, in one feasible implementation, the input terminal of the auxiliary device 123 is electrically connected to the second output terminal of the converter 17 to supply power to the auxiliary device 123.

[0072] In this technical solution, the auxiliary equipment 123 is connected to the converter 17. The converter 17 converts the output voltage of the DC bus 15 into AC power and then directly supplies power to the auxiliary equipment 123.

[0073] Furthermore, auxiliary equipment 123 includes chiller units, hydrogen dryers, purification devices, etc.

[0074] In one feasible implementation, the maximum power point tracking device 14, the DC bus 15, the energy storage battery 11, the energy management system 13, and the converter 17 are integrated in the first housing 21 to form an energy storage module.

[0075] In this technical solution, a multi-unit integrated design is adopted, which integrates the maximum power point tracking device 14, DC bus 15, energy storage battery 11, energy management system 13 and converter 17 into the first housing 21, which can save a lot of equipment space and the overall layout of the equipment is compact and practical.

[0076] Furthermore, the converter 124, electrolyzer 121, auxiliary equipment 123, and hydrogen storage device 122 are integrated into the second housing 22 to form a hydrogen production and storage module 12, realizing the modular design of the energy system, improving the compactness of the overall layout of the energy system, and greatly reducing the footprint of the entire system.

[0077] like Figure 1 As shown, in one feasible implementation, the power generation module 10 includes photovoltaic modules, which are connected in series to form photovoltaic strings, and the photovoltaic strings are connected in parallel to form an array. The array is electrically connected to a maximum power point tracking device 14, which performs maximum power point tracking on the electrical energy output by the array.

[0078] Among them, the square array corresponds one-to-one with the maximum power point tracking device 14.

[0079] In this technical solution, photovoltaic modules are connected in series to form photovoltaic strings, and photovoltaic strings are connected in parallel to form arrays. The arrays are respectively connected to the terminals of the corresponding maximum power point tracking devices 14, so that the maximum power point tracking devices 14 can track the maximum power point of the corresponding arrays. After the current is collected, it is input to the DC bus 15. The maximum power point tracking devices 14 adjust the operating point of the corresponding photovoltaic arrays so that each array always operates at the maximum power point, thereby improving the energy conversion efficiency of the photovoltaic strings, maximizing the utilization of energy in the power generation module 10, and stabilizing the voltage of the DC bus 15.

[0080] Example 1:

[0081] The energy system includes photovoltaic (PV) power generation modules, energy storage modules, and hydrogen production and storage modules. It uses LRS-72HTH-570M PV modules (LONGi). The main parameters of the PV modules are shown in Table 1. Fifteen PV modules are connected in series to form one string, resulting in a total of 24 strings. Six strings are connected in parallel to form one array, and four arrays are connected to four DC MPPT terminals for maximum power point tracking. The parallel current is then fed into the DC bus via a DC switch. The PV power generation system outputs an open-circuit voltage of 779V and a peak power voltage of 656V, with a total installed capacity of 205kW. The energy storage module includes a DC MPPT, energy storage batteries, a PCS converter, and an energy management system. Based on the output voltage of the energy storage batteries, the DC bus voltage is set to 600–800V. The energy storage batteries use lithium iron phosphate cells with a square shape and aluminum casing. The nominal voltage of the cells is 3.2V, and the voltage range is 2V. The battery pack has a nominal capacity of 280Ah, a PACK configuration of 1P16S, a nominal voltage of 51.2V, a system configuration of 1P224S, a nominal voltage of 716.8V, an operating voltage range of 604.8–806.4V, a rated charge / discharge rate of 0.5C, and a rated energy of 200.7kWh. The connection between the energy storage battery and the DC bus uses a bidirectional circuit breaker, allowing for both power intake and supply to the DC bus. A unidirectional DC / AC type PCS converter is directly connected to the DC bus to convert DC to AC. The output of the PCS converter is connected to a 400V AC grid to supply AC loads such as air conditioners and lighting. A custom-developed Energy Management System (EMS) integrates the functions of the Battery Management System (BMS) and is based on the Modbus communication protocol. TCP performs real-time acquisition and interaction of signal data from the DC MPPT, energy storage battery body, PCS converter, DC / DC converter for PEM electrolyzer, and PEM electrolyzer, runs energy management strategies, and reads and records historical data. The hydrogen production and storage module includes a DC / DC converter, PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment, and hydrogen storage device. A 100kW rated power PEM electrolyzer is used as the hydrogen production electrolysis equipment. The DC / DC converter for the PEM electrolyzer is directly connected to the DC bus to reduce the bus voltage from 600-800V to the voltage range of 0-120V applicable to the PEM electrolyzer. The hydrogen produced by the PEM electrolyzer is dried and purified before being fed into the hydrogen storage device for storage. The hydrogen storage device uses a magnesium-based solid hydrogen storage tank with high hydrogen storage density.

[0082] Example 2:

[0083] The energy system includes photovoltaic (PV) power generation modules, energy storage modules, and hydrogen production and storage modules. It uses LRS-72HTH-580M PV modules (LONGi). The main parameters of the PV modules are shown in Table 1. Thirteen PV modules are connected in series to form one string, resulting in a total of 28 strings. Fourteen strings are connected in parallel to form two arrays, each connected to a DC MPPT terminal for maximum power point tracking. The parallel current is then fed into the DC bus via a DC switch. The PV power generation system outputs an open-circuit voltage of 679V and a peak power voltage of 573V, with a total installed capacity of 211kW. The energy storage module includes a DC MPPT, a storage battery, a PCS converter, and an energy management system. Based on the output voltage of the storage battery, the DC bus voltage is set to 500–750V. The storage battery uses lithium iron phosphate cells with a square shape and aluminum casing. The nominal voltage of the cells is 3.2V, and the voltage range of the cells is... The operating voltage range is 2.5–3.65V, the nominal capacity of the battery cell is 280Ah, the battery pack configuration is 1P14S, the nominal voltage of the battery pack is 44.8V, the battery system configuration is 1P196S, the nominal voltage of the battery system is 627.2V, the operating voltage range of the battery system is 490–715.4V, the rated charge / discharge rate of the battery system is 0.5C, and the rated energy of the energy storage battery itself is 175.6kWh. The connection between the energy storage battery and the DC bus uses a bidirectional circuit breaker, allowing power to be drawn from or supplied to the DC bus. A bidirectional DC / AC type PCS converter is directly connected to the DC bus to convert DC power to AC power. The output of the PCS converter is connected to the auxiliary support equipment of the proton exchange membrane electrolyzer, such as hydrogen drying and purification devices. The custom-developed energy management system (EMS) integrates the functions of the battery management system (BMS) and is based on the CAN communication protocol. The FD performs real-time acquisition and interaction of signal data from the DC MPPT, the energy storage battery body, the PCS converter, the DC / DC converter used in the PEM electrolyzer, and the PEM electrolyzer itself. It also runs energy management strategies and reads and records historical data. The hydrogen production and storage module includes a DC / DC converter, a PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment, and a hydrogen storage device. A 100kW rated power PEM electrolyzer is used as the hydrogen production electrolysis equipment. The DC / DC converter used in the PEM electrolyzer is directly connected to the DC bus to reduce the bus voltage from 500 to 750V to the voltage range of 0 to 120V suitable for the PEM electrolyzer. The hydrogen produced by the PEM electrolyzer is dried and purified before being fed into the hydrogen storage device for storage. The hydrogen storage device uses a rare earth solid hydrogen storage tank.

[0084] Example 3:

[0085] The energy system includes photovoltaic (PV) power generation modules, energy storage modules, and hydrogen production and storage modules. It uses JKM580N-72HL4-V PV modules (Jinko). The main parameters of the PV modules are shown in Table 1. Seventeen PV modules are connected in series to form one string, resulting in a total of 24 strings. Eight strings are connected in parallel to form one array, and these three arrays are connected to three DC MPPT terminals for maximum power point tracking. The parallel current is then fed into the DC bus via a DC switch. The system outputs an open-circuit voltage of 889V and a peak power voltage of 737V, with a total photovoltaic installed capacity of 237kW. The energy storage module includes a DC MPPT, the energy storage battery itself, a PCS converter, and an energy management system. Based on the output voltage of the energy storage battery, the DC bus voltage is set to 700-900V. The energy storage battery uses lithium iron phosphate cells, which are square in shape with an aluminum casing. The nominal voltage of the cells is 3.2V, the voltage range is 2.5-3.65V, and the nominal capacity is [missing information]. The battery pack has a capacity of 280Ah, with a 1P18S configuration and a nominal voltage of 57.6V. The battery system has a 1P252S configuration and a nominal voltage of 806.4V. The operating voltage range of the battery system is 630–919.8V, and the rated charge / discharge rate is 0.5C. The rated energy of the battery itself is 226kWh. A bidirectional circuit breaker connects the battery to the DC bus, allowing for both power intake and output from the DC bus. A bidirectional DC / AC type PCS converter is directly connected to the DC bus to convert DC to AC. Output 1 of the PCS converter connects to auxiliary support equipment for the proton exchange membrane electrolyzer, such as hydrogen drying and purification devices. Output 2 connects to a 400V AC power grid to supply AC loads such as air conditioning and lighting. A custom-developed energy management system (EMS) integrates the functions of the battery management system (BMS) and is based on the Modbus communication protocol. The RTU performs real-time acquisition and interaction of signal data from the DC MPPT, the energy storage battery body, the PCS converter, the DC / DC converter used in the PEM electrolyzer, and the PEM electrolyzer itself. It also runs energy management strategies and reads and records historical data. The hydrogen production and storage module includes a DC / DC converter, a PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment, and a hydrogen storage device. A 150kW rated power PEM electrolyzer is used as the hydrogen production electrolysis equipment. The DC / DC converter used in the PEM electrolyzer is directly connected to the DC bus to reduce the bus voltage from 700-900V to the voltage range of 0-180V applicable to the PEM electrolyzer. The hydrogen produced by the PEM electrolyzer is dried and purified before being fed into the hydrogen storage device for storage. The hydrogen storage device uses a composite hydrogen storage alloy solid hydrogen storage tank.

[0086] Table 1. Photovoltaic module parameters in Examples 1-3

[0087]

[0088]

[0089] STC: AM1.5 1000W / m 2 25℃ NOCT: AM1.5 800W / m 2 20℃ 1m / s

[0090] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. An electrolytic hydrogen production coupled energy system, characterized in that, The electrolytic hydrogen production coupled energy system includes: A power generation module, wherein the power generation module is used to generate electricity; An energy storage module is electrically connected to the power generation module. The energy storage module includes an energy storage battery that stores the electrical energy output by the power generation module and supplies power to the hydrogen production and storage module. A hydrogen production and storage module, wherein the hydrogen production and storage module is electrically connected to the energy storage module; An energy management system is provided, wherein the energy management system is connected to the energy storage battery via a network cable, and the energy management system is connected to the hydrogen production and storage module via a network cable or a network communication protocol. The energy management system allocates at least the electrical energy stored in the energy storage battery to the hydrogen production and storage module. A maximum power point tracking device is provided, wherein the input terminal of the maximum power point tracking device is electrically connected to the power generation module, the maximum power point tracking device tracks and disturbs the output power of the electrical energy output by the power generation module, and the maximum power point tracking device is connected to the energy management system via a network cable or network communication protocol. A DC bus is electrically connected to the output terminal of the maximum power point tracking device and to the input terminal of the energy storage battery, and bidirectionally transmits electrical energy between the DC bus and the energy storage battery.

2. The electrolytic hydrogen production coupled energy system according to claim 1, characterized in that, The energy management system is integrated into the management system of the energy storage battery, and the energy management system collects data from the power generation module, the energy storage module and the hydrogen production and storage module in real time.

3. The electrolytic hydrogen production coupled energy system according to claim 1, characterized in that, The hydrogen production and storage module includes: An electrolytic cell is electrically connected to a DC bus and connected to an energy management system via a network cable or network communication protocol. The electrolytic cell uses DC current to electrolyze water to produce hydrogen and oxygen. An auxiliary device is electrically connected to the electrolytic cell, and the auxiliary device separates, purifies, and dries the hydrogen and oxygen produced by the electrolysis of the electrolytic cell. A hydrogen storage device, wherein the collection port of the hydrogen storage device is connected to the hydrogen outlet of the auxiliary equipment, and the hydrogen storage device collects hydrogen that has been processed by the auxiliary equipment.

4. The electrolytic hydrogen production coupled energy system according to claim 3, characterized in that, The hydrogen production and storage module also includes: The converter has its input terminal electrically connected to the DC bus and its output terminal electrically connected to the electrolytic cell. The converter is connected to the energy management system via a network cable or a network communication protocol.

5. The electrolytic hydrogen production coupled energy system according to claim 1, characterized in that, The energy storage module also includes: A converter, the input terminal of which is electrically connected to the DC bus to convert DC power into AC power, and the converter is connected to the energy management system via a network cable.

6. The electrolytic hydrogen production coupled energy system according to claim 5, characterized in that, The electrolytic hydrogen production coupled energy system also includes: An AC power grid, wherein the input terminal of the AC power grid is electrically connected to the first output terminal of the converter; The electrical equipment has its input terminal electrically connected to the output terminal of the AC power grid so that the AC power grid can supply power to the electrical equipment.

7. The electrolytic hydrogen production coupled energy system according to claim 3, characterized in that, The input terminal of the auxiliary device is electrically connected to the second output terminal of the converter to supply power to the auxiliary device.

8. The electrolytic hydrogen production coupled energy system according to claim 5, characterized in that, The maximum power point tracking device, the DC bus, the energy storage battery, the energy management system, and the converter are integrated into the first enclosure to form the energy storage module.

9. The electrolytic hydrogen production coupled energy system according to claim 8, characterized in that, The power generation module includes photovoltaic modules, which are connected in series to form photovoltaic strings, and the photovoltaic strings are connected in parallel to form an array. The array is electrically connected to the maximum power point tracking device, which tracks the power output of the array at the maximum power point. The square array corresponds one-to-one with the maximum power point tracking device.

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