Electrolytic hydrogen production coupling energy system

Abstract

The invention 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 invention 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] The present application belongs to the technical field of hydrogen production from renewable energy, and specifically relates to an electrolysis hydrogen production coupled energy system. Background Art

[0002] Using renewable energy sources such as photovoltaics and wind power to generate hydrogen through electrolysis of water to replace fossil fuel reforming to generate hydrogen has great development prospects. It can use water and low-carbon electricity to produce clean energy carriers, which can significantly improve energy utilization and provide an effective way to decarbonize entire industries such as transportation, manufacturing and agriculture.

[0003] Using renewable energy sources such as solar energy and wind energy to produce hydrogen can not only convert fluctuating renewable energy into chemical energy for storage, but also obtain truly clean "green hydrogen", which has broad development prospects; however, renewable energy generation such as solar energy and wind energy is intermittent and random, and the existing renewable energy power generation system is difficult to guarantee the continuity and stability of power supply, which will have a certain impact on the hydrogen production equipment, affecting the operating stability, efficiency, and operating life of the water electrolysis hydrogen production system. Summary of the invention

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

[0005] In view of this, according to an embodiment of the present application, a coupled energy system for hydrogen production by electrolysis is proposed, comprising:

[0006] A power generation module, the power generation module is used for generating electricity;

[0007] An energy storage module, the energy storage module is electrically connected to the power generation module, the energy storage module includes an energy storage battery, the energy storage battery stores the electric energy output by the power generation module, and the energy storage module supplies power to the hydrogen production and storage module;

[0008] A hydrogen production and storage module, the hydrogen production and storage module is electrically connected to the energy storage module;

[0009] Energy management system: 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 at least distributes the electrical energy stored in the energy storage battery to the hydrogen production and storage module.

[0010] In a feasible implementation, 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.

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

[0012] A maximum power point tracking device, the input end of which is electrically connected to the power generation module, the maximum power point tracking device tracks and disturbs the power output of the power generation module, and the maximum power point tracking device is connected to the energy management system via a network cable or a network communication protocol;

[0013] A DC bus is electrically connected to the output end of the maximum power point tracking device, and the DC bus is electrically connected to the input end of the energy storage battery, and transmits electric energy bidirectionally between the energy storage batteries.

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

[0015] An electrolyzer, the electrolyzer is electrically connected to a DC bus, the electrolyzer is connected to an energy management system via a network cable or a network communication protocol, and the electrolyzer utilizes DC power to electrolyze water to generate hydrogen and oxygen;

[0016] Auxiliary equipment, the auxiliary equipment is electrically connected to the electrolyzer, and the auxiliary equipment separates, purifies and dries the hydrogen and oxygen generated by electrolysis in the electrolyzer;

[0017] A hydrogen storage device, wherein the collecting port of the hydrogen storage device is connected to the hydrogen outlet of the electrolyzer auxiliary equipment, and the hydrogen storage device collects the hydrogen processed by the electrolyzer auxiliary equipment.

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

[0019] The converter has an input end electrically connected to the DC bus, an output end electrically connected to the electrolyzer, and the converter is connected to the energy management system via a network cable or a network communication protocol.

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

[0021] The converter has an input terminal 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 a feasible implementation, the electrolysis hydrogen production coupled energy system further includes:

[0023] An alternating current grid, wherein an input end of the alternating current grid is electrically connected to a first output end of the converter.

[0024] The input end of the electric device is electrically connected to the output end of the AC power grid so as to supply power to the electric device through the AC power grid.

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

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

[0027] In a feasible implementation, the power generation module includes photovoltaic modules, the photovoltaic modules are connected in series to form photovoltaic strings, the photovoltaic strings are connected in parallel to form an array, the array is electrically connected to a maximum power point tracking device, and the maximum power point tracking device tracks the maximum power point of the electric energy output by the array;

[0028] Among them, the square array corresponds to the maximum power point tracking device one by one.

[0029] Compared with the prior art, the electrolysis hydrogen production coupled energy system of the present application has the following beneficial effects:

[0030] The electrolysis hydrogen production coupled energy system provided in the embodiment of the present 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 electric energy generated and 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, so that after the energy management system performs real-time data monitoring and energy management on the energy flowing through the system, the electric energy is distributed to the hydrogen production and storage module, and the power generation module, the energy storage battery and the inverter cooperate to supply power to the hydrogen production and storage module through the DC bus to balance and suppress the electric energy fluctuation directly supplied by the power generation module, thereby ensuring the smooth operation of the hydrogen production and storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

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

[0033] in, Figure 1 The corresponding relationship between the reference numerals and component names in the figure is:

[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 box; 22. Second box;

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

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0040] like Figure 1 As shown, according to an embodiment of the present application, a coupled energy system for hydrogen production by electrolysis 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 for generating electricity; the energy storage module is electrically connected to the power generation module 10, the energy storage module comprises an energy storage battery 11, the energy storage battery 11 stores the electric 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, 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 electric energy stored in the energy storage battery 11 to the hydrogen production and storage module 12.

[0041] The electrolysis hydrogen production coupled energy system provided in the embodiment of the present 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 electric energy generated 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 through a network cable, and the hydrogen production and storage module 12 is connected to the energy management system 13 through a network cable or a network communication protocol, so that after the energy management system 13 performs real-time data monitoring and energy management on the energy flowing through the system, electric energy is distributed to the hydrogen production and storage module 12, the energy storage module and the AC power grid 18, and the power generation module 10, the energy storage battery 11 and the converter 17 cooperate to supply power to the hydrogen production and storage module 12 through the DC bus 15 to balance and suppress the electric energy fluctuation directly supplied by the power generation module 10, so as to ensure the smooth operation of the hydrogen production and storage module 12.

[0042] It can be understood that a communication connection is established between devices in the network in a wired manner through a network cable connection; a communication connection is established between devices in the network in a wireless manner through a network communication protocol connection. 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 solution, the power generation module 10 is a photovoltaic power generation system, and the power generation module 10 includes a photovoltaic module, which generates electricity based on the photoelectric effect to supply power.

[0044] As a preferred solution, the energy storage battery 11 adopts a lithium iron phosphate battery with high safety, long life and low cost.

[0045] like Figure 1 As shown, in a feasible implementation, the energy management system 13 is integrated into the management system of the energy storage battery 11 , and the energy management system 13 collects data of 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 data interaction of the energy management system 13, but also reduces the complexity and cost of the composition of the electrolysis hydrogen production coupled energy system.

[0047] Furthermore, the energy management system 13 adopts the 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 BMS function of the management system of the energy storage battery 11, so as to run energy management strategies, real-time energy monitoring, and historical data recording through the EMS system, which not only improves the flexibility of data interaction, but also eliminates the need to set up a separate host computer, reduces the complexity of data interaction, and reduces the complexity and investment cost of the entire system, thereby saving the cost of building the entire energy system.

[0048] like Figure 1 As shown, in a feasible embodiment, the electrolysis hydrogen production coupling energy system also includes: a maximum power point tracking device 14 and a DC bus 15; the input end 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 disturbs the power of the electric energy output by the power generation module 10, and the maximum power point tracking device 14 is connected to the energy management system 13 through a network cable; the DC bus 15 is electrically connected to the output end of the maximum power point tracking device 14, the DC bus 15 is electrically connected to the input end of the energy storage battery 11, and transmits electric energy bidirectionally between the energy storage battery 11.

[0049] In this technical solution, after the power generation module 10 outputs electric energy, it is transmitted to the DC bus 15 after the maximum power point is tracked by the maximum power point tracking device 14. The maximum power point tracking device 14 is connected to the energy management system 13 through a network cable, so that the maximum power point tracking device 14 can be monitored by the energy management system 13; the energy storage battery 11 is directly connected to the DC bus 15, so that the surplus electric energy output by the DC bus 15 is stored by the energy storage battery 11, and the loss of the hydrogen production and storage module 12 is reduced by DC off-grid power supply, thereby improving the overall efficiency and reliability of the system.

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

[0051] like Figure 1 As shown, in a feasible embodiment, the hydrogen production and storage module 12 includes: an electrolyzer 121, an 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 is 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 treated by the auxiliary equipment 123, and the hydrogen storage device 122 collects the hydrogen treated by the auxiliary equipment 123.

[0052] In this technical solution, the electrolyzer 121 produces hydrogen by electrolyzing water using the electric energy generated by the power generation module 10 or the electric energy from the energy storage battery 11 or the electric energy from the AC power grid 18. The hydrogen produced by the electrolysis of water in the electrolyzer 121 is stored in the hydrogen storage device 122. Hydrogen is produced and stored on site to save the cost of long-distance transportation of hydrogen.

[0053] It can be understood that the hydrogen generated by the electrolytic cell 121 is input into the rear-end hydrogen storage device 122 after purification and other auxiliary devices to ensure the quality of hydrogen storage and facilitate subsequent use.

[0054] As a preferred solution, the hydrogen storage device 122 uses metal hydride solid hydrogen storage with high hydrogen storage density, high safety and reusability, which can efficiently adsorb, store and release hydrogen.

[0055] In some examples, the hydrogen storage device 122 includes but is not limited to a solid hydrogen storage device, a liquid hydrogen storage device, etc. As a preferred solution, the hydrogen storage device 122 uses a solid hydrogen storage device with high hydrogen storage density, high safety, and reusability, so as to efficiently adsorb, store and release hydrogen.

[0056] In some examples, the electrolyzer 121 includes but is not limited to a PEM electrolyzer, an alkaline electrolyzer, etc. As a preferred solution, the electrolyzer 121 uses a proton exchange membrane electrolyzer PEM as a hydrogen production electrolyzer. Compared with the commonly used alkaline electrolyzer, it has a short response time, can be started and stopped quickly, and is more suitable for matching a photovoltaic power generation system. Specifically, the electrolyzer 121 uses a proton exchange membrane electrolyzer PEM that can be started within a range of 10% to 150% of the rated power as a hydrogen production electrolyzer, which is more responsive to the volatility of 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 a feasible embodiment, the electrolysis hydrogen production coupled energy system also includes: a converter 124; the input end of the converter 124 is electrically connected to the DC bus 15, the output end of the converter 124 is electrically connected to the electrolyzer 121, and the converter 124 is connected to the energy management system 13 via a network cable or a network communication protocol.

[0059] In this technical solution, the electrolyzer 121 is connected to the DC bus 15 through a converter 124 to change the voltage of the DC bus 15 and convert the voltage to a voltage range suitable for the electrolyzer 121, so that the power generation module 10, the energy storage battery 11 and the AC power grid 18 cooperate to supply energy to the electrolyzer 121 through the DC bus 15, that is, the power generation module 10 preferentially supplies energy to the electrolyzer 121, when the power generation of the power generation module 10 is insufficient, the energy storage battery 11 can also directly supply energy to the electrolyzer 121, when the power generation of the power generation module 10 is insufficient and the storage capacity of the energy storage battery 11 is insufficient, the AC power grid 18 can also directly supply energy to the electrolyzer 121 through the converter 17, and multiple guarantees are provided to realize the stable operation of hydrogen production by the electrolyzer 121. The use of the converter 17 in conjunction with the DC bus 15 for off-grid hydrogen production can save multiple power conversion processes such as inversion, boosting, and rectification, reduce system losses, and improve the power utilization efficiency of the system.

[0060] It can be understood that the energy management system EMS is integrated into the battery management system BMS. It not only has the functions of BMS, but also can collect data from units such as the maximum power point tracking device 14, the energy storage battery 11, the inverter 17 and the converter 124, the electrolytic cell 121 in real time and interact with each other to realize the system's operating energy management strategy, real-time monitoring of energy data, recording of historical data and other functions.

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

[0062] Specifically, the converter 124 is a DC / DC converter.

[0063] like Figure 1 As shown, in a feasible embodiment, the electrolysis hydrogen production coupling energy system also includes: a converter 17 and an AC power grid 18; the input end of the converter 17 is electrically connected to the DC bus 15, and the converter 17 is a bidirectional converter 17, which can convert DC power into AC power and also convert AC power into DC power. The converter 17 is connected to the energy management system 13 via a network cable; the input end of the AC power grid 18 is electrically connected to the first output end of the converter 17.

[0064] In this technical solution, the converter 17 is directly connected to the DC bus 15 to convert DC power into AC power, and the AC power is connected to the AC grid 18 to power other AC power-consuming devices 19 in the power generation system, thereby realizing the effective utilization and distribution of electric energy.

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

[0066] In this technical solution, the electric 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, and the remaining electric energy can be stored in the energy storage battery 11. If there is surplus electric energy after the energy storage battery 11 is full, the electric energy output by the DC bus 15 can be converted by the inverter 17 and supplied to the AC power grid 18 and the electrical equipment 19 for use. The multiple module design and the power matching design between the modules further ensure that the sunlight in the time periods with strong light and the time periods with weak light can be fully utilized, thereby effectively avoiding the occurrence of "abandoned light" and "abandoned electricity" phenomena.

[0067] In some examples, the converter 17 may be a unidirectional converter or a bidirectional converter. As a preferred solution, the converter 17 is a bidirectional DC / AC PCS converter.

[0068] like Figure 1 As shown, in a feasible embodiment, the electrolysis hydrogen production coupled energy system also includes: an AC power grid 18 and an electrical device 19; the input end of the AC power grid 18 is electrically connected to the first output end of the converter 17; the input end of the electrical device 19 is electrically connected to the output end 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 is used to directly power AC load equipment such as temperature control and lighting, so as to effectively utilize the system power, reduce system losses, and improve the utilization efficiency of the system power.

[0070] In this technical solution, a DC bus 15 is set up and each main power supply unit including an energy storage battery 11, an electrical equipment 19 and a hydrogen production and storage module 12 is connected to the DC bus 15. The energy management system 13 is used to couple each main power supply unit to collaboratively smooth the volatility of the power generation module 10, which can better suppress the adverse effects of the volatility of photovoltaic power generation, thereby ensuring the overall smooth operation of the energy system, compared with relying solely on the energy storage battery 11.

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

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

[0073] Furthermore, the auxiliary equipment 123 includes a chiller, a hydrogen drying and purification device, etc.

[0074] In a 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 box 21 to form an energy storage module.

[0075] In this technical solution, a multi-unit integrated design is adopted to integrate 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 into the first box 21, which can save a lot of space occupied by the equipment and make the overall layout of the equipment compact and practical.

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

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

[0078] There is a one-to-one correspondence between the square arrays and the maximum power point tracking devices 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 corresponding maximum power point tracking devices 14 terminals, so that the maximum power point of the corresponding arrays is tracked by the maximum power point tracking devices 14, and the converged power is input to the DC bus 15. The maximum power point tracking device 14 adjusts the working point of the corresponding photovoltaic array 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 the energy in the power generation module 10, and stabilizing the voltage of the DC bus 15.

[0080] Embodiment 1:

[0081] The energy system includes photovoltaic power generation module, energy storage module and hydrogen production and storage module; the photovoltaic module model LRS-72HTH-570M (Longi) is used. The main parameters of the photovoltaic module are shown in Table 1. 15 photovoltaic modules are connected in series to form a string, and a total of 24 strings are assembled. Every 6 strings are connected in parallel to form a square array. A total of 4 square arrays are connected to 4 DC MPPT terminals for maximum power point tracking, and then connected in parallel and converged to the DC bus through the DC switch. The open circuit voltage output by the photovoltaic power generation system is 779V, the peak power voltage is 656V, and the total installed capacity of photovoltaic is 205kW; the energy storage module includes DC MPPT, energy storage battery, PCS converter and energy management system; the DC bus voltage is set to 600-800V based on the output voltage of the energy storage battery. The energy storage battery body uses lithium iron phosphate battery cells. The battery cell shape is square and aluminum shell. The nominal voltage of the battery cell is 3.2V, and the voltage range of the battery cell is 2. 5~3.65V, the nominal capacity of the battery cell is 280Ah, the combination of battery PACK is 1P16S, the nominal voltage of battery PACK is 51.2V, the combination of battery system is 1P224S, the nominal voltage of battery system is 716.8V, the operating voltage range of battery system is 604.8~806.4V, the rated charge and discharge rate of battery system is 0.5C, and the rated energy of energy storage battery is 200.7kWh; the connection between energy storage battery and DC bus adopts bidirectional circuit breaker, which can draw power from DC bus and supply power to DC bus; a unidirectional DC / AC type PCS converter is directly connected to DC bus to convert DC into AC, and the output end of PCS converter is connected to 400V AC grid to supply AC load electrical equipment such as air conditioner and lighting; the customized energy management system EMS integrates the functions of battery management system BMS, based on communication protocol Modbus TCP collects and interacts with the signal data of DC MPPT, energy storage battery body, PCS converter, DC / DC converter for PEM electrolyzer and PEM electrolyzer in real time, runs energy management strategy, and reads and records historical data. The hydrogen production and storage module includes DC / DC converter, PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment and hydrogen storage device. A PEM electrolyzer with a rated power of 100kW 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 of 600-800V to the voltage range of 0-120V applicable to the PEM electrolyzer. The hydrogen produced by the PEM electrolyzer is input into the hydrogen storage device for storage after passing through the hydrogen drying and purification device. The hydrogen storage device uses a magnesium solid-state hydrogen storage tank with high hydrogen storage density.

[0082] Embodiment 2:

[0083] The energy system includes photovoltaic power generation modules, energy storage modules and hydrogen production and storage modules; the photovoltaic module model LRS-72HTH-580M (Longi) is used. The main parameters of the photovoltaic module are shown in Table 1. 13 photovoltaic modules are connected in series to form a string, and a total of 28 strings are assembled. Every 14 strings are connected in parallel to form a square array. A total of 2 square arrays are connected to 2 DC MPPT terminals for maximum power point tracking, and then connected in parallel and input to the DC bus through a DC switch. The open circuit voltage output by the photovoltaic power generation system is 679V, the peak power voltage is 573V, and the total installed capacity of photovoltaic power generation is 211kW; the energy storage module includes DC MPPT, energy storage battery body, PCS converter and energy management system; based on the output voltage of the energy storage battery body, the DC bus voltage is set to 500~750V. The energy storage battery body uses lithium iron phosphate cells. The cell shape is square and aluminum shell. The nominal voltage of the cell is 3.2V, and the voltage range of the cell is The range of the battery is 2.5-3.65V, the nominal capacity of the battery cell is 280Ah, the combination of the battery PACK is 1P14S, the nominal voltage of the battery PACK is 44.8V, the combination of the battery system 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 and discharge rate of the battery system is 0.5C, and the rated energy of the energy storage battery body is 175.6kWh; the connection between the energy storage battery body and the DC bus adopts a bidirectional circuit breaker, which can both draw power from the DC bus and supply power to the DC bus; a bidirectional DC / AC type PCS converter is directly connected to the DC bus to convert DC power into AC power, and the output end of the PCS converter is connected to the auxiliary support equipment of the proton exchange membrane PEM electrolyzer, such as hydrogen drying and purification devices; the customized energy management system EMS integrates the functions of the battery management system BMS, based on the communication protocol CAN FD collects and interacts with the signal data of DC MPPT, energy storage battery body, PCS inverter, DC / DC converter for PEM electrolyzer and PEM electrolyzer in real time, runs energy management strategy, and reads and records historical data; the hydrogen production and storage module includes DC / DC converter, PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment and hydrogen storage device; a PEM electrolyzer with a rated power of 100kW is used as the hydrogen production electrolysis equipment, and the DC / DC converter for PEM electrolyzer is directly connected to the DC bus to reduce the bus voltage of 500-750V to the voltage range of 0-120V applicable to the PEM electrolyzer; the hydrogen produced by the PEM electrolyzer is input into the hydrogen storage device for storage after passing through the hydrogen drying and purification device; the hydrogen storage device uses a rare earth solid-state hydrogen storage tank.

[0084] Embodiment 3:

[0085] The energy system includes photovoltaic power generation modules, energy storage modules and hydrogen production and storage modules; the photovoltaic module model JKM580N-72HL4-V (Jinko) is used. The main parameters of the photovoltaic module are shown in Table 1. 17 photovoltaic modules are connected in series to form a string, and a total of 24 strings are assembled. Every 8 strings are connected in parallel to form a square array. A total of 3 square arrays are connected to 3 DC MPPT terminals for maximum power point tracking, and then connected in parallel and converged to the DC bus through the DC switch. The photovoltaic power generation system The open circuit voltage of the system output is 889V, the peak power voltage is 737V, and the total installed capacity of photovoltaic is 237kW; the energy storage module includes DC MPPT, energy storage battery body, PCS converter and energy management system; based on the output voltage of the energy storage battery body, the DC bus voltage is set to 700-900V. The energy storage battery body adopts lithium iron phosphate battery cell, the battery cell shape is square, aluminum shell, the nominal voltage of the battery cell is 3.2V, the voltage range of the battery cell is 2.5-3.65V, and the nominal capacity of the battery cell is 280Ah, the combination of battery PACK is 1P18S, the nominal voltage of battery PACK is 57.6V, the combination of battery system is 1P252S, the nominal voltage of battery system is 806.4V, the operating voltage range of battery system is 630~919.8V, the rated charge and discharge rate of battery system is 0.5C, and the rated energy of energy storage battery is 226kWh; the connection between energy storage battery and DC bus adopts bidirectional circuit breaker, which can both draw power from DC bus and supply power to DC bus; bidirectional DC / AC type PCS converter is directly connected to DC bus to convert DC into AC, the output terminal 1 of PCS converter is connected to the auxiliary support equipment of proton exchange membrane PEM electrolyzer, such as hydrogen drying and purification device, and the output terminal 2 of PCS converter is connected to 400V AC grid to supply AC loads such as air conditioning and lighting; the customized energy management system EMS integrates the functions of battery management system BMS, based on communication protocol Modbus RTU collects and interacts with the signal data of DC MPPT, energy storage battery body, PCS inverter, DC / DC converter for PEM electrolyzer and PEM electrolyzer in real time, runs energy management strategy, reads and records historical data, etc.; the hydrogen production and storage module includes DC / DC converter, PEM hydrogen production electrolyzer, electrolyzer auxiliary equipment and hydrogen storage device; a PEM electrolyzer with a rated power of 150kW is used as the hydrogen production electrolysis equipment, and the DC / DC converter for the PEM electrolyzer is directly connected to the DC bus to reduce the bus voltage of 700-900V to the voltage range of 0-180V applicable to the PEM electrolyzer; the hydrogen produced by the PEM electrolyzer passes through the hydrogen drying and purification device and then is input into the hydrogen storage device for storage; the hydrogen storage device uses a composite hydrogen storage alloy solid hydrogen storage tank.

[0086] Table 1 Parameters of photovoltaic modules in Examples 1 to 3

[0087]

[0088]

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

[0090] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0091] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An electrolysis hydrogen production coupled energy system, characterized in that: The electrolysis hydrogen production coupled energy system comprises: A power generation module, wherein the power generation module is used for generating electricity; An energy storage module, the energy storage module is electrically connected to the power generation module, the energy storage module includes an energy storage battery, the energy storage battery stores the electric energy output by the power generation module, and the energy storage module supplies power to the hydrogen production and storage module; A hydrogen production and storage module, the hydrogen production and storage module is electrically connected to the energy storage module; An energy management system, 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, and the energy management system at least distributes the electrical energy stored in the energy storage battery to the hydrogen production and storage module.

2. The electrolysis 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 of the power generation module, the energy storage module and the hydrogen production and storage module in real time.

3. The electrolysis hydrogen production coupled energy system according to claim 1, characterized in that: The energy storage module also includes: A maximum power point tracking device, wherein the input end 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 electric 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 a network communication protocol; A DC bus, wherein the DC bus is electrically connected to the output end of the maximum power point tracking device, the DC bus is electrically connected to the input end of the energy storage battery, and transmits electric energy bidirectionally between the DC bus and the energy storage battery.

4. The electrolysis hydrogen production coupled energy system according to claim 1, characterized in that: The hydrogen production and storage module comprises: An electrolyzer, wherein the electrolyzer is electrically connected to a DC bus, the electrolyzer is connected to an energy management system via a network cable or a network communication protocol, and the electrolyzer utilizes DC power to electrolyze water to generate hydrogen and oxygen; Auxiliary equipment, the auxiliary equipment is electrically connected to the electrolytic cell, and the auxiliary equipment separates, purifies and dries the hydrogen and oxygen generated by electrolysis in the electrolytic cell; A hydrogen storage device, wherein the collecting port of the hydrogen storage device is connected to the hydrogen outlet of the auxiliary equipment, and the hydrogen storage device collects the hydrogen processed by the auxiliary equipment.

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

6. The electrolysis hydrogen production coupled energy system according to claim 3, characterized in that: The energy storage module also includes: A converter, wherein an input end of the converter 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.

7. The electrolysis hydrogen production coupled energy system according to claim 6, characterized in that: The electrolysis hydrogen production coupled energy system also includes: an AC power grid, an input end of the AC power grid being electrically connected to a first output end of the converter; An electric device, wherein an input end of the electric device is electrically connected to an output end of the AC power grid so as to supply power to the electric device through the AC power grid.

8. The electrolysis hydrogen production coupled energy system according to claim 4, characterized in that: The input end of the auxiliary device is electrically connected to the second output end of the converter to supply power to the auxiliary device.

9. The electrolysis hydrogen production coupled energy system according to claim 6, 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 in a first box to form the energy storage module.

10. The electrolysis hydrogen production coupled energy system according to claim 9, characterized in that: The power generation module includes photovoltaic modules, the photovoltaic modules are connected in series to form photovoltaic strings, the photovoltaic strings are connected in parallel to form a square array, the square array is electrically connected to the maximum power point tracking device, and the maximum power point tracking device performs maximum power point tracking on the electric energy output by the square array; Therein, the square array corresponds one to one with the maximum power point tracking device.

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