Modularized direct-current coupling hydrogen production power supply device

Abstract

The utility model discloses a modularized direct current coupling hydrogen production power supply device which comprises a cabinet body and a power module installed in the cabinet body, and the cabinet body is of a modularized structure so as to achieve parallel expansion. The power module adopts a bipolar DC / DC isolation type circuit topological structure, and can effectively isolate a direct current side power grid from an electrolytic cell load end, thereby ensuring power utilization safety. The input side is directly connected to a photovoltaic direct-current side bus, and a direct-current power supply meeting the wide range of the hydrogen production electrolytic cell is output. The system has the advantages of simple and compact structure, good expansibility, wide application range and the like.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of hydrogen production power supply, in particular to a modular direct current coupled hydrogen production power supply device. Background Art

[0002] In the water electrolysis hydrogen production system, a DC-coupled hydrogen production power supply refers to a power supply device that connects to a low-voltage DC power grid such as photovoltaic power and converts its DC power into the DC power required by the hydrogen electrolyzer. It is usually used in scenarios such as distributed microgrids close to new energy and hydrogen production plants or photovoltaic off-grid hydrogen production.

[0003] The existing DC-coupled hydrogen production power supply has the following technical problems:

[0004] 1. In the DC-coupled hydrogen production power supply system, since the photovoltaic side and the electrolyzer use different grounding schemes, circuit isolation is required, and the traditional DCDC solution cannot be directly applied.

[0005] 2. High-power hydrogen production power sources are usually large in size and inconvenient to transport and install. Utility Model Content

[0006] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides a modular DC-coupled hydrogen production power supply device with a simple and compact structure, low cost, good scalability and a wide range of applications.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A modular DC-coupled hydrogen production power supply device includes a cabinet and a power module installed in the cabinet. The cabinet has a modular structure to achieve parallel expansion. The power module adopts a bipolar DC / DC isolation circuit topology, with the input side directly connected to the photovoltaic DC side bus, and the output meets the wide range of DC power supply requirements of the hydrogen production electrolyzer.

[0009] As a further improvement of the present invention: a DC input unit is provided on the cabinet, and the DC input unit is located in the top area of ​​the cabinet; the DC input unit includes a DC input busbar, a fuse and a DC filter, and the connection terminal of the input busbar is located at the top of the cabinet to realize parallel input of multiple power cabinets.

[0010] As a further improvement of the present invention: the cabinet adopts a water-cooling heat dissipation structure, which includes a water-cooling pipe. The water-cooling pipe is located in the middle of the cabinet to simultaneously connect the inlet and outlet water channels of the front and rear power modules.

[0011] As a further improvement of the present invention: the water inlet and outlet pipes are all H-shaped structures, and are placed in staggered layers.

[0012] As a further improvement of the present invention: the inlet and outlet of the water system pipeline of the water cooling and heat dissipation structure are located at the bottom of the cabinet or the side outlet of the cabinet.

[0013] As a further improvement of the present invention: a water-to-air heat exchanger and a centrifugal fan configured for the water-to-air heat exchanger are arranged on the top of the cabinet, which form three cavities with the partitions in the cabinet to form a circulating air duct.

[0014] As a further improvement of the present invention, the water-to-air heat exchanger draws air from the center from bottom to top, and then blows air from top to bottom and back to front, forming a circulation of air path to control the stability of the temperature inside the cabinet.

[0015] As a further improvement of the present invention: the cabinet includes a frame, the top of the frame is provided with one or more lifting holes, and the bottom is provided with a forklift hole for supporting top and bottom lifting and transportation.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. The modular DC-coupled hydrogen production power supply device of the utility model has a simple and compact structure, low cost, good scalability, and a wide range of applications. It can realize the direct connection of the DC-coupled photovoltaic converter to the hydrogen production electrolyzer, providing the DC power supply required by the electrolyzer. Through DC-coupled hydrogen production, the efficiency of electric energy utilization is improved, and hydrogen production on the power generation side of the photovoltaic system is realized.

[0018] 2. The modular DC-coupled hydrogen production power supply device of the present invention solves the different power requirements of the electrolyzer through multiple power branches and flexible parallel connection of single cabinets. It can realize rapid parallel cabinet assembly and accurately meet the power requirements. At the same time, it greatly reduces the design and development process and increases the maintenance convenience of the hydrogen production power supply system.

[0019] 3. The modular DC-coupled hydrogen production power supply device of the present invention adopts the form of multiple power branches or single cabinets in parallel, which improves the redundancy of the hydrogen production power supply system. When a single or several power branches or single cabinets fail, the corresponding faulty power branch or single cabinet can be cut off. The hydrogen production power supply system only loses part of the power and will not completely exit, thereby improving the operating stability of the hydrogen production power supply system.

[0020] 4. In the modular DC-coupled hydrogen production power supply device of the present invention, the main power module of the power cabinet is water-cooled, and the heat dissipation of other auxiliary components is achieved by water-air heat exchange. The temperature inside the cabinet is precisely controlled, and there is no need for heat exchange with the outside air. It has a high protection level and is suitable for outdoor use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the principle of the hydrogen production power supply in a specific embodiment of the utility model.

[0022] Figure 2 It is a structural diagram of the entire hydrogen production power supply device in a specific embodiment of the utility model.

[0023] Figure 3 It is a schematic diagram of the structural principle of a cross section in a specific embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of the structural principle of another cross section in a specific embodiment of the utility model.

[0025] Figure 5 It is a schematic diagram of the structural principle of the water system pipeline from one perspective in a specific embodiment of the utility model.

[0026] Figure 6 It is a schematic diagram of the structural principle of the water system pipeline from another perspective in a specific embodiment of the utility model.

[0027] Figure 7 It is a schematic diagram of the air circulation in the cabinet in a specific embodiment of the present invention.

[0028] Figure 8 It is a schematic structural diagram of a power supply device adopting a quadruple structure in a specific embodiment of the utility model.

[0029] Legend:

[0030] 1. Cabinet frame; 2. DC input unit; 3. Power module; 4. Water cooling pipe; 41. Water inlet pipe; 42. Water outlet pipe; 5. DC output unit; 21. DC input busbar; 22. Fuse; 23. DC filter; 51. DC output busbar; 52. Output isolating switch; 53. Control unit; 121. Water-to-air heat exchanger; 122. Centrifugal fan. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "assemble," "connect," "connect," "fix," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] like Figure 1 and Figure 8 As shown, this utility model discloses a modular DC-coupled hydrogen production power supply device that utilizes a bipolar DC / DC isolated circuit topology. The input side can be directly connected to the photovoltaic DC busbar. Through DC / DC isolated conversion, the output can meet the wide range of DC power requirements of electrolyzers. Furthermore, the power supply adopts a modular cabinet design, allowing for parallel expansion of multi-pole power supply unit cabinets to accommodate electrolyzers of varying capacities.

[0036] like Figure 2 As shown in the figure, in a specific application example, the cabinet adopts a back-to-back arrangement with two sides, including a cabinet frame 1, a DC input unit 2, a power module 3 (DCDC), a water cooling pipe 4, and a DC output unit 5. The hydrogen production power supply power modules of this utility model are installed back-to-back, which is compact. For example, one unit cabinet can accommodate 16 power modules 3.

[0037] In a specific application example, two circular lifting holes are provided at the front and back of the top of the cabinet frame 1, and a rectangular forklift hole is provided at the bottom to support top and bottom lifting and transportation.

[0038] See also Figure 3 and Figure 4 In a specific application example, the DC input unit 2 is located in the top area of ​​the cabinet. The DC input unit 2 includes a DC input busbar 21, a fuse 22, and a DC filter 23. The connection terminal of the DC input busbar 21 is located at the top of the cabinet, which can realize parallel input of multiple power cabinets.

[0039] In a specific application example, the power module 3 adopts a bipolar DC / DC isolation circuit topology scheme, the capacity of a single power module 3 is 70-80kW, and a water cooling heat dissipation scheme is adopted. In this example, the number of power modules 3 arranged in the cabinet is 16, and different numbers of power modules 3 can be arranged according to the system capacity requirement, and the number 2N of power modules 3 is arranged, wherein N is an integer.

[0040] In a specific application example, the power module 3 includes a water cooling plate, an isolation transformer, a power device, and a control part, and the bottom of the power module 3 is provided with a mounting guide rail and a handle, facilitating disassembly and fixation of the power module 3.

[0041] In this example, four layers of module mounting structures are arranged on the front, back, top and bottom of the unit cabinet, and each layer of mounting structure includes a bottom support beam, a guide rail mounting beam, a bottom mounting bracket and a top mounting bracket. The bottom mounting bracket is provided with a conical positioning pin.

[0042] Referring to Figure 5 and Figure 6 In a specific application example, the power supply cabinet adopts water cooling heat dissipation, and the water cooling pipe 4 is located at the middle position of the power supply cabinet. The water cooling pipe 4 includes a water inlet pipe 41 and a water outlet pipe 42. The water inlet and outlet pipes are both H-shaped structures, and are arranged in an up-down staggered structure, so that the water inlet and outlet connections of the front and rear power modules 3 can be realized at the same time.

[0043] In a specific application example, the DC output unit 5 is located at the bottom area of the cabinet, and the DC output unit 5 includes a DC output bus 51 and an output disconnecting switch 52. The wiring end of the DC output bus 51 is located at the bottom of the cabinet, and the parallel output of multiple power supply cabinets can be realized. The secondary power distribution and control part 53 is arranged at the bottom area of the cabinet.

[0044] Referring to Figure 7 In a specific application example, the top of the cabinet is provided with a water-air heat exchanger 121 and a centrifugal fan 122 configured for the water-air heat exchanger 121, and three cavities are formed by the cabinet inner partition plate to form a circulating air duct. The water-air heat exchanger 121 sucks air from the middle downward, and then blows air from top to bottom and front to back, forming a circulating air path to control the stability of the temperature in the cabinet.

[0045] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any improvement and decoration without departing from the principle of the present application should be considered as the protection scope of the present application.

Claims

1. A modular DC-coupled hydrogen production power supply device, comprising a cabinet and a power module installed in the cabinet, characterized in that: The cabinet has a modular structure to achieve parallel expansion; the power module adopts a bipolar DC / DC isolated circuit topology, with the input side directly connected to the photovoltaic DC side bus, and the output meets the wide range of DC power supply for the hydrogen production electrolyzer.

2. The modular DC-coupled hydrogen production power supply device according to claim 1, characterized in that: The cabinet is provided with a DC input unit, which is located in the top area of ​​the cabinet; the DC input unit includes a DC input busbar, a fuse and a DC filter, and the connection terminal of the input busbar is located at the top of the cabinet to realize parallel input of multiple power cabinets.

3. The modular DC-coupled hydrogen production power supply device according to claim 1, characterized in that: The cabinet adopts a water-cooling heat dissipation structure, which includes a water-cooling pipe. The water-cooling pipe is located in the middle of the cabinet to simultaneously connect the inlet and outlet water pipes of the front and rear power modules.

4. The modular DC-coupled hydrogen production power supply device according to claim 3, characterized in that: The inlet and outlet water pipes are both H-shaped structures, and are placed in staggered layers.

5. The modular DC-coupled hydrogen production power supply device according to claim 3, characterized in that: The inlet and outlet of the water system pipeline of the water cooling and heat dissipation structure are located at the bottom of the cabinet or the side outlet of the cabinet.

6. The modular DC-coupled hydrogen production power supply device according to any one of claims 1 to 4, characterized in that: A water-to-air heat exchanger and a centrifugal fan configured for the water-to-air heat exchanger are arranged on the top of the cabinet, and together with the partitions in the cabinet, three cavities are formed to form a circulating air duct.

7. The modular DC-coupled hydrogen production power supply device according to claim 6, characterized in that: The water-to-air heat exchanger draws air from the middle from bottom to top, and then blows air from top to bottom and back to front, forming a circulation of the air path to control the stability of the temperature in the cabinet.

8. The modular DC-coupled hydrogen production power supply device according to any one of claims 1 to 4, characterized in that: The cabinet body includes a frame, and the top of the frame is provided with one or more lifting holes, and the bottom is provided with a forklift hole for supporting top and bottom lifting and transportation.

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