An integrated dc conversion device for a photovoltaic power plant and an energy storage

Abstract

The utility model discloses an integrated DC conversion device for photovoltaic power station and energy storage device, including the box of front and rear through, the front end of box is equipped with the front cabinet door, the rear end of box is equipped with the rear cabinet door, the front cabinet door is equipped with ventilation grille and state monitoring instrument, be equipped with the heat abstractor assembly on the rear cabinet door, the inside of box is equipped with the inner frame, be equipped with a plurality of installation groove of matrix distribution in the inner frame, the DC conversion module of detachable installation can be installed in the installation groove. The utility model discloses a matrix distribution installation groove design, supports integrated multiway DC conversion module independent installation and maintenance, and each DC conversion module corresponds independent heat dissipation ventilation path and independent monitoring circuit, so that the background can carry out real -time, accurate monitoring to each DC conversion module and the working condition of photovoltaic module connected with it, when appearing the fault or the exception, can accurate positioning fault line, provides the convenience for troubleshooting, fast maintenance.

Description

Technical Field

[0001] This application relates to the field of power electronic equipment technology, and more specifically, to an integrated DC conversion device for use between a photovoltaic power plant and an energy storage device. Background Technology

[0002] In the integrated application of photovoltaic power generation and energy storage systems, DC conversion devices, as the core equipment for energy transmission, undertake key functions such as voltage regulation, power matching, and power quality control.

[0003] Traditional DC conversion devices used in photovoltaic power generation and energy storage systems often adopt an integrated structure or a small number of high-power modules integrated solution. The DC output of multiple photovoltaic modules is combined and regulated through a single or high-power DC-DC conversion module, and then connected to the energy storage system or grid.

[0004] Traditional DC conversion devices were able to meet the needs of small and medium-sized photovoltaic systems in the past, but with the expansion of photovoltaic power plants and the increase in the complexity of energy storage systems, traditional DC conversion devices have gradually exposed many defects: Traditional DC conversion devices mostly adopt an integrated structure or a parallel scheme of high-power modules, and mostly use centralized monitoring of the total input / output end. When a single photovoltaic module line fails, it is necessary to shut down and check all lines to find the fault point, which seriously affects the availability of the system. In addition, multiple conversion modules share the heat dissipation channel, and the heat of the DC conversion module operating under high load will be conducted to the adjacent modules through thermal radiation, resulting in a decrease in the efficiency of the adjacent DC conversion modules.

[0005] Therefore, we propose an integrated DC conversion device for use between photovoltaic power plants and energy storage devices to solve the existing problems. Utility Model Content

[0006] The purpose of this invention is to provide an integrated DC conversion device for use between a photovoltaic power station and an energy storage device, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an integrated DC conversion device for use between a photovoltaic power station and an energy storage device, comprising a box that runs through the front and rear, a front door at the front end of the box, a rear door at the rear end of the box, a ventilation grille and a status monitoring instrument at the front door, a heat dissipation assembly on the rear door, an inner frame inside the box, a plurality of mounting slots arranged in a matrix within the inner frame, a DC conversion module detachably mounted in each mounting slot, an air guide assembly communicating with the ventilation grille between the mounting slot and the DC conversion module, and wiring boxes fixedly mounted on both sides of the box, each wiring box containing a detection assembly connected to the status monitoring instrument via wires.

[0008] Preferably, the air guiding assembly includes a first air guiding structure disposed on the side wall of the mounting groove and a second air guiding structure disposed at the front end of the mounting groove, wherein the first air guiding structure is connected to the second air guiding structure and the second air guiding structure is connected to the ventilation grille.

[0009] Preferably, the inner frame is made of insulating material.

[0010] Preferably, the DC conversion module includes a module body, and the rear end of the module body is provided with a first terminal and a second terminal. The first terminal is connected to the DC output terminal of the photovoltaic power station, and the second terminal is connected to the DC input terminal of the energy storage device.

[0011] Preferably, the heat dissipation assembly includes a plurality of cooling fans fixedly installed in a matrix at one end of the rear door located inside the box. A heat dissipation baffle is also provided between the cooling fans and the rear door, and the heat dissipation baffle is provided with a ventilation groove connecting the outside of the rear door and the inside of the box.

[0012] Preferably, the wiring box has a removable cover on the side away from the box body, the wiring box has a wiring hole that penetrates the side wall of the box body, and a detection component is provided on the outside of the wiring hole.

[0013] Preferably, the number of the wire holes, detection components, and status monitoring instruments is the same as the number of mounting slots and they are connected in a one-to-one correspondence.

[0014] Preferably, both the front and rear doors are connected to the box body via hinges and are equipped with locking mechanisms.

[0015] This utility model provides an integrated DC conversion device for photovoltaic power plants and energy storage devices. Compared with the prior art, its advantages are as follows: This utility model integrates a matrix-style mounting slot inside the housing to support the integration of multiple independent DC conversion modules. Each DC conversion module corresponds to an independent heat dissipation and ventilation path and an independent monitoring line, enabling the backend to monitor the working status of each DC conversion module and the photovoltaic modules connected to it in real time and accurately. In the event of a fault or abnormality, the faulty line can be accurately located, providing convenience for fault diagnosis and rapid repair. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention (second perspective). Figure 3 This is a three-dimensional structural diagram of the cable connection state of this utility model; Figure 4This is a three-dimensional schematic diagram of the box body, inner frame, and front door connection structure of this utility model; Figure 5 For the present utility model Figure 4 Enlarged view of a portion of the structure at point A; Figure 6 For the present utility model Figure 4 A magnified view of the structure at point B in the middle.

[0017] In the diagram: 1. Housing; 2. Front door; 21. Ventilation grille; 3. Status monitoring instrument; 4. Inner frame; 41. Mounting slot; 42. First air guide structure; 43. Second air guide structure; 5. DC conversion module; 51. First terminal; 52. Second terminal; 6. Wiring box; 61. Cover plate; 7. Detection component; 8. Rear door; 81. Heat dissipation baffle; 9. Heat dissipation component. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] In addition, the term "multiple" should mean two or more.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Examples, such as Figures 1 to 6 As shown, an integrated DC conversion device for connecting a photovoltaic power station and an energy storage device includes a through-type housing 1. The housing 1 has a front door 2 at its front end and a rear door 8 at its rear end. The front door 2 has a ventilation grille 21 and a status monitoring instrument 3. The rear door 8 has a heat dissipation assembly 9. Inside the housing 1 is an inner frame 4 with several matrix-distributed mounting slots 41. DC conversion modules 5 are detachably installed in the mounting slots 41. An air guide assembly communicating with the ventilation grille 21 is provided between the mounting slots 41 and the DC conversion modules 5. Wiring boxes 6 are also fixedly installed on both sides of the housing 1. Detection components 7 are installed in the wiring boxes 6 and connected to the status monitoring instrument 3 via wires. In use… The enclosure 1 serves as the main body, and its interior is equipped with an inner frame 4. The inner frame 4 divides the internal space of the enclosure 1 into several mounting slots 41 arranged in a matrix, which are used to install several DC conversion modules 5 one by one. The mounting slots 41 are equipped with air guide components. The ventilation grille 21 on the front door 2 is connected to the air guide components, which helps to ventilate and dissipate heat, and remove the heat generated by the DC conversion modules 5 during operation. The photovoltaic cable passes through the junction box 6 at one end of the enclosure 1 and is connected to the first terminal 51 of the DC conversion module 5. The second terminal 52 of the DC conversion module 5 is connected to the DC input terminal of the energy storage device after passing through the junction box at the other end of the cable. The detection component 7 in the junction box 6 is fitted on the cable to detect the line status and feed back to the status monitoring instrument 3.

[0025] Furthermore, the air guiding assembly includes a first air guiding structure 42 disposed on the side wall of the mounting groove 41 and a second air guiding structure 43 disposed at the front end of the mounting groove 41. The first air guiding structure 42 and the second air guiding structure 43 are connected, and the second air guiding structure 43 is connected to the ventilation grille 21. The first air guiding structure 42 is located on the side wall of the mounting groove 41, and the second air guiding structure 43 is connected to each other at the front end of the mounting groove 41. The second air guiding structure 43 is connected to the ventilation grille 21, which can form an orderly air duct. The heat generated by the DC conversion module 5 during operation is drawn away by the cooling fan of the rear door 8 and discharged to the outside of the box 1 through the first air guiding mechanism, thus avoiding heat accumulation inside the box 1.

[0026] Furthermore, the inner frame 4 is made of insulating material to prevent current from passing through unexpected paths and causing short circuits between multiple DC conversion modules 5 in the event of leakage or other situations.

[0027] Furthermore, the DC conversion module 5 includes a module body, and the rear end of the module body is provided with a first terminal 51 and a second terminal 52. The first terminal 51 is connected to the DC output terminal of the photovoltaic power station, and the second terminal 52 is connected to the DC input terminal of the energy storage device. In use, the first terminal 51 is connected to the DC output terminal of the photovoltaic power station to receive the DC power generated by the photovoltaic power station; the second terminal 52 is connected to the DC input terminal of the energy storage device to transmit the DC-converted electrical energy to the energy storage device, thereby realizing the function of electrical energy transmission and conversion.

[0028] Furthermore, the heat dissipation component 9 includes several cooling fans fixedly installed in a matrix at one end of the rear door 8 located inside the box 1. A heat dissipation baffle 81 is also provided between the cooling fans and the rear door 8. The heat dissipation baffle 81 is provided with ventilation slots that connect the outside of the rear door 8 and the inside of the box 1. When in use, when the cooling fans are working, the heat inside the box 1 is discharged to the outside of the rear door 8 through the ventilation slots via the air guide component, thereby reducing the temperature inside the box 1 and ensuring that the equipment operates in a suitable temperature environment.

[0029] Furthermore, the junction box 6 has a removable cover plate 61 on the side away from the enclosure 1. The junction box 6 has a wire hole that penetrates the side wall of the enclosure 1. A detection component 7 is provided on the outside of the wire hole. When in use, the cover plate 61 can be removed for easy wiring and maintenance. The wire hole penetrates the side wall of the enclosure 1. The detection component 7 is located on the outside of the wire hole and corresponds to the wire hole. When cables or other items pass through the wire hole, they also pass through the detection component 7 corresponding to the wire hole. The detection component 7 can detect the line current parameters using the principle of electromagnetic induction and transmit the detection data to the status monitoring instrument 3 through the wire, thereby monitoring the power generation status of the photovoltaic panel and the status of the DC conversion module 5.

[0030] Furthermore, the number of wiring holes, detection components 7, and status monitoring instruments 3 are the same as the number of mounting slots 41 and are connected one-to-one. In use, each DC conversion module 5 has an independent line detection and status monitoring channel, which can accurately monitor the working status of each DC conversion module 5 and the photovoltaic panel that transmits power to the DC conversion module 5, ensuring the normal operation of the photovoltaic power generation line.

[0031] Furthermore, both the front door 2 and the rear door 8 are connected to the housing 1 via hinges and are equipped with locking mechanisms. In use, the front door 2 and the rear door 8 are connected to the housing 1 via hinges for easy opening and closing. The locking mechanism ensures the sealing and stability of the doors when closed, preventing external dust, moisture, etc. from entering the housing 1. It also ensures the safety of the equipment during operation and prevents the doors from being opened accidentally.

[0032] The working principle of this utility model is as follows: In use, this utility model employs a front-to-back through-type housing 1 structure. The front end is equipped with a front door 2 featuring a ventilation grille 21 and a status monitoring instrument 3, while the rear end has a rear door 8 containing a matrix-type cooling fan. The interior of the housing 1 is divided into modular mounting slots 41 by an inner frame 4 made of insulating material. Each mounting slot 41 can independently install a DC conversion module 5, meeting the integrated deployment requirements of the DC conversion module 5 between the photovoltaic power station and the energy storage system. This facilitates centralized monitoring, management, and maintenance. The interior of the housing 1 achieves efficient thermal management through the linkage of air guide components and the cooling fan. When the DC conversion module 5 is running, under the action of the cooling fan, the second air guide structure 43 at the front end of the mounting slot 41 introduces cold air into the mounting slot 41 through the ventilation grille 21. The cold air mixes with the heat emitted by the DC conversion module 5 during operation via the first air guide structure 42 to form hot air, which, under the extraction action of the cooling fan, moves along the first air guide structure 42 towards the rear door 8 until it is discharged outside the housing 1 through the heat dissipation baffle 81.

[0033] The above-described specific embodiments are merely preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above-described specific embodiments.

Claims

1. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device, comprising a through-type housing (1), wherein the front end of the housing (1) is provided with a front door (2) and the rear end of the housing (1) is provided with a rear door (8), characterized in that: The front door (2) is provided with a ventilation grille (21) and a status monitoring instrument (3). The rear door (8) is provided with a heat dissipation component (9). The box body (1) is provided with an inner frame (4). The inner frame (4) is provided with a number of mounting slots (41) arranged in a matrix. A DC conversion module (5) is detachably installed in the mounting slot (41). An air guide component communicating with the ventilation grille (21) is provided between the mounting slot (41) and the DC conversion module (5). A wiring box (6) is also fixedly installed on both sides of the box body (1). A detection component (7) is provided in the wiring box (6). The detection component (7) is connected to the status monitoring instrument (3) through a wire.

2. The integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 1, characterized in that: The air guide assembly includes a first air guide structure (42) disposed on the side wall of the mounting groove (41) and a second air guide structure (43) disposed at the front end of the mounting groove (41). The first air guide structure (42) is connected to the second air guide structure (43), and the second air guide structure (43) is connected to the ventilation grille (21).

3. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 2, characterized in that: The inner frame (4) is made of insulating material.

4. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 3, characterized in that: The DC conversion module (5) includes a module body. The rear end of the module body is provided with a first terminal (51) and a second terminal (52). The first terminal (51) is connected to the DC output terminal of the photovoltaic power station, and the second terminal (52) is connected to the DC input terminal of the energy storage device.

5. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 2, characterized in that: The heat dissipation assembly (9) includes several heat dissipation fans fixedly installed in a matrix at one end of the rear door (8) located inside the box body (1). A heat dissipation baffle (81) is also provided between the heat dissipation fans and the rear door (8). The heat dissipation baffle (81) is provided with a ventilation groove that connects the outside of the rear door (8) and the inside of the box body (1).

6. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 1, characterized in that: The wiring box (6) has a detachable cover plate (61) on the side away from the box body (1). The wiring box (6) has a wiring hole that penetrates the side wall of the box body (1) inside. A detection component (7) is provided on the outside of the wiring hole.

7. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 6, characterized in that: The number of the threading holes, detection components (7), and status monitoring instruments (3) are the same as the number of mounting slots (41) and are connected in a one-to-one correspondence.

8. An integrated DC conversion device for use between a photovoltaic power station and an energy storage device according to claim 1, characterized in that: Both the front door (2) and the rear door (8) are connected to the box body (1) by hinges and are equipped with locking mechanisms.

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