String type converter integrated system and energy storage all-in-one machine

Abstract

The utility model discloses a string type converter integration system and an energy storage all-in-one machine, and relates to the technical field of energy storage, the string type converter integration system comprises a cabinet, the cabinet is provided with a first installation cavity, a second installation cavity and a third installation cavity from top to bottom in sequence; the electrical assembly is arranged in the second mounting cavity; the converter modules are arranged in the third mounting cavity, the multiple converter modules are arranged side by side, and the multiple converter modules are electrically connected with the electrical assembly; and the heat dissipation structure is arranged in the first mounting cavity, and the heat dissipation structure is used for discharging heat generated by the converter module out of the cabinet. According to the technical scheme of the utility model, the assembly difficulty and cost of the converter integration system are reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a string converter integrated system and an integrated energy storage unit. Background Technology

[0002] With the rapid development of new energy power generation and smart grid technologies, the integrated design of energy storage systems, as core devices for energy conversion and power regulation, has become an important development direction in the industry. The energy storage converter (PCS), as a key device for achieving bidirectional AC / DC power conversion, directly affects the operational reliability and service life of the entire energy storage system through its thermal management efficiency and the rationality of its system layout. However, traditional layout methods complicate the installation and maintenance process, increasing construction difficulty and labor costs. Utility Model Content

[0003] The main purpose of this utility model is to provide a string converter integrated system and an energy storage unit, which aims to reduce the assembly difficulty and cost of the converter integrated system.

[0004] To achieve the above objectives, this utility model provides a string converter integrated system, which includes:

[0005] The server rack is provided with a first mounting cavity, a second mounting cavity, and a third mounting cavity from top to bottom;

[0006] Electrical components are disposed in the second mounting cavity;

[0007] A converter module is disposed in the third mounting cavity, and multiple converter modules are arranged side by side, wherein the multiple converter modules are electrically connected to the electrical components; and

[0008] A heat dissipation structure is provided in the first mounting cavity, and the heat dissipation structure is used to dissipate the heat generated by the inverter module from the cabinet.

[0009] In one embodiment, the heat dissipation structure includes a first heat exchanger disposed in the first mounting cavity, and the integrated system further includes a liquid cooling pipeline connecting the first heat exchanger and the converter module.

[0010] In one embodiment, each of the converter modules is provided with an AC output terminal on top, and the electrical components include an AC bus, the AC output terminal and the AC bus being electrically connected.

[0011] In one embodiment, the AC busbar is disposed at the bottom of the second mounting cavity, and the AC output terminals and the AC busbar are arranged side by side in the direction from the front to the back of the cabinet.

[0012] In one embodiment, the back of the cabinet has a wiring port for connecting an external transformer.

[0013] In one embodiment, the electrical component further includes an AC switch electrically connected to the AC bus.

[0014] In one embodiment, a DC wiring compartment is provided at the lower part of the front of the cabinet, and the inverter module is provided with a DC input terminal, which is located in the DC wiring compartment.

[0015] In one embodiment, the second mounting cavity includes an air inlet cavity and an electrical cavity, the air inlet cavity also communicating with the first mounting cavity, and the electrical components are disposed within the electrical cavity.

[0016] In one embodiment, the integrated system further includes a second heat exchanger, a portion of which is disposed in the electrical cavity to absorb heat from the electrical components, and the remainder of which is disposed in the air inlet cavity.

[0017] In one embodiment, the integrated system further includes a fan module disposed in the first mounting cavity and located above the first heat exchanger.

[0018] In one embodiment, the top wall of the first mounting cavity is provided with a mounting port, and the fan module includes a fan body disposed at the mounting port and a fan cover covering the fan body. The top wall and / or side wall of the fan cover are provided with an air outlet.

[0019] In one embodiment, the integrated system further includes a ventilation mesh, and the air outlet is provided on the top wall of the fan housing, with the ventilation mesh disposed at the air outlet.

[0020] In one embodiment, the integrated system further includes a water tank and a water pump. The water tank is located on the top of the cabinet and is arranged side by side with the fan module. The water pump is located in the first mounting cavity and is connected to the liquid cooling pipeline.

[0021] To achieve the above objectives, this utility model provides an integrated energy storage unit, which includes a transformer and the aforementioned string converter integrated system, wherein the transformer and the electrical components are electrically connected.

[0022] In one embodiment, there are at least two string converter integrated systems, and the at least two string converter integrated systems are arranged side by side.

[0023] In one embodiment, the back of the cabinet of the string converter integrated system is disposed opposite to the transformer, and the surface of the cabinet facing the transformer is provided with a wiring port, through which cables electrically connecting the transformer and the electrical components pass.

[0024] The technical solution of this application arranges multiple converter modules side-by-side in the third mounting cavity of the cabinet, concentrating the converter modules, which account for the largest proportion of the total mass, in the lower part of the cabinet. This effectively lowers the overall center of gravity of the equipment, significantly reducing the risk of tipping over due to vibration during transportation. Furthermore, placing the heavier converter modules at a lower position facilitates assembly by operators, reducing assembly difficulty and thus improving the convenience and safety of disassembly and assembly. Simultaneously, the converter modules are integrated into the cabinet and can be transported simultaneously, eliminating the need for on-site assembly and reducing installation costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the string converter integrated system of this utility model;

[0027] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the string converter integrated system of this utility model;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of part A in the middle.

[0029] Explanation of icon numbers:

[0030] 100. Cabinet; 110. First mounting cavity; 120. Second mounting cavity; 121. Air inlet cavity; 122. Electrical cavity; 200. Electrical components; 210. AC busbar; 220. AC switch; 300. Converter module; 310. AC output terminal; 400. Heat dissipation structure; 410. First heat exchanger; 500. Second heat exchanger; 610. Liquid cooling pipeline; 620. Water tank; 630. Water pump; 710. Fan module; 711. Fan body; 712. Fan housing; 720. Ventilation mesh.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, in the embodiments of this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0036] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by the embodiments of this utility model.

[0037] As a key device for bidirectional AC / DC power conversion, the thermal management efficiency and system layout rationality of the energy storage system directly affect its operational reliability and service life. In existing integrated energy storage converter system designs, a layered modular layout is typically adopted, placing the converter modules in the upper space of the system. Since the converter modules themselves can weigh hundreds of kilograms, high-level installation requires hoisting equipment for positioning, making operation extremely difficult in space-constrained containerized energy storage systems. Furthermore, during later maintenance or replacement, technicians must climb to the top of the equipment, posing safety hazards and incurring time and labor costs. Simultaneously, the centralized arrangement of large-mass converter modules at the top shifts the overall center of gravity of the equipment, making it prone to structural instability and overturning risks under dynamic conditions such as transportation. In other words, the traditional layout method complicates the installation and maintenance process, increasing construction difficulty and labor costs.

[0038] In view of this, this utility model embodiment provides a string converter integrated system, in which multiple converter modules are arranged horizontally in the third mounting cavity of the cabinet. Specifically, each converter module can be arranged in the third mounting cavity of the cabinet, so that the converter module with the largest proportion of total mass is concentrated in the lower part of the cabinet, which can effectively lower the overall center of gravity of the equipment and significantly reduce the risk of tipping over due to vibration during transportation. Moreover, placing the heavier converter module in the lower position of the equipment makes it easier for operators to assemble, reduces the assembly difficulty, and thus improves the convenience and safety of disassembly and assembly. At the same time, the heat dissipation structure is set in the first mounting cavity, eliminating the need for a complex heat dissipation structure in the third mounting cavity, and occupying less space at the bottom of the cabinet.

[0039] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.

[0040] like Figure 1 and Figure 2 As shown in the figure, this utility model embodiment proposes a string converter integrated system, the string converter integrated system comprising:

[0041] The cabinet 100 has a first mounting cavity 110, a second mounting cavity 120, and a third mounting cavity arranged sequentially from top to bottom. Specifically, the cabinet 100 can adopt a common structural form, with the first mounting cavity 110, the second mounting cavity 120, and the third mounting cavity arranged sequentially from top to bottom. The first mounting cavity 110 is used to install the heat dissipation structure 400, the second mounting cavity 120 is used to install the electrical components 200, and the third mounting cavity is used to install the converter module 300.

[0042] An electrical component 200 is disposed in the second mounting cavity 120. Specifically, the electrical component 200 may include an AC bus 210, capable of collecting and outputting the AC output lines of each current transformer module. Optionally, refer to... Figure 2 The electrical component 200 may also include an AC switch 220, and an AC bus 210 electrically connects the AC output line and the AC switch 220, enabling switching control of the AC output;

[0043] A plurality of converter modules 300 are disposed in the third mounting cavity and arranged side by side. These converter modules 300 are electrically connected to the electrical components 200. It is understood that the multiple converter modules 300 are all disposed in the third mounting cavity, i.e., the center of gravity is concentrated at the bottom of the cabinet 100, which facilitates installation and maintenance, while improving structural stability and preventing tipping. In one embodiment, the converter module 300 is a string converter, which can reduce the cable length and wiring complexity on the DC side. In another embodiment, the converter module 300 is a two-in-one converter, capable of receiving two DC inputs and integrating the two DC inputs into one AC output; for example, each DC input is 215KW, and the final AC output is 430KW.

[0044] A heat dissipation structure 400 is provided in the first heat exchanger 410 in the first mounting cavity 110. The heat dissipation structure 400 is used to dissipate the heat generated by the inverter module 300 from the cabinet 100. Optionally, the heat dissipation structure 400 can be liquid cooling, air cooling, or a combination of air cooling and liquid cooling, etc., and is not limited here.

[0045] In this embodiment, by arranging multiple converter modules 300 side-by-side in the third mounting cavity of the cabinet 100, the converter modules 300, which account for the largest proportion of the total mass, are concentrated in the lower part of the cabinet 100. This effectively lowers the overall center of gravity of the equipment, significantly reducing the risk of tipping over due to vibration during transportation. Furthermore, placing the heavier converter modules 300 at a lower position facilitates assembly by operators, reducing assembly difficulty and thus improving the convenience and safety of disassembly and assembly. Simultaneously, the converter modules 300 are integrated into the cabinet 100 and can be transported simultaneously, eliminating the need for on-site assembly and reducing installation costs.

[0046] In one embodiment of the present invention, the heat dissipation structure 400 includes a first heat exchanger 410 disposed in the first mounting cavity 110, and the integrated system further includes a liquid cooling pipeline 610 connected to the first heat exchanger 410.

[0047] Specifically, the first heat exchanger 410 is disposed in the first mounting cavity 110, and the liquid cooling pipe 610 extends from the first mounting cavity 110 to the third mounting cavity and is connected to the converter module 300. It can be understood that the heat dissipation structure 400 in this embodiment combines air cooling and liquid cooling. Specifically, the coolant in the liquid cooling pipe 610 absorbs heat from the converter module 300 and flows into the first heat exchanger 400. The coolant flowing into the first heat exchanger 400 is cooled by air cooling, and the cooled coolant flows back into the liquid cooling pipe 610 to dissipate heat from the converter module 300. Moreover, since the first heat exchanger 410 is disposed in the first mounting cavity 110, there is no need to set up a complex heat dissipation structure 400 in the third mounting cavity, which reduces the occupancy of the third mounting cavity, allowing the third mounting cavity to be smaller, thereby saving the area occupied by the cabinet 100. Furthermore, there is no need to set up a heat dissipation channel between the converter module 300 and the electrical components 200, and the AC output line of the converter module 300 does not need to cross the heat dissipation channel. The length of the AC output line of the converter module 300 can be greatly reduced, effectively reducing the cost of use.

[0048] In one embodiment, the housing of the current transformer module is provided with a liquid cooling channel, and the liquid cooling pipe 610 is connected to the liquid cooling channel to realize the circulation of coolant.

[0049] In one embodiment of this utility model, the plurality of converter modules 300 are divided into at least two groups of converter modules. Each group of converter modules includes at least two converter modules 300 and shares a first heat exchanger 410 and a liquid cooling pipeline 610. Thus, by having each group of converter modules share a first heat exchanger 410 and a liquid cooling pipeline 610, the demand for heat dissipation equipment is reduced, thereby lowering the hardware cost of the system. Simultaneously, the system design complexity is simplified, making the manufacturing and assembly process more efficient, further saving costs. Moreover, it helps to reduce the space required inside the cabinet 100, improving space utilization, making the entire system more compact, and allowing more functional components to be installed in a limited space, enhancing the system's scalability and flexibility. Specifically, the number of converter modules 300 in the converter modules of different groups can be the same or different, and is not limited here. It is understood that the liquid cooling pipeline 610 includes a main pipeline and branch pipelines. Each group of converter modules is provided with a main pipeline and a first heat exchanger 410. Each converter module 300 in each group of converter modules is provided with a branch pipeline. Multiple branch pipelines in each group of converter modules are connected in parallel to the main pipeline. Of course, in one embodiment, the main pipeline is also connected to a distributor. Multiple branch pipelines are connected to the main pipeline through the distributor, which can be used to distribute coolant to each branch pipeline.

[0050] In one embodiment of this utility model, each converter module 300 is provided with an AC output terminal 310 on its top, and the electrical component 200 includes an AC bus 210. The AC output terminal 310 and the AC bus 210 are electrically connected. Thus, the AC output terminal 310 and the electrical component 200 are arranged opposite each other, with a closer distance between them, resulting in shorter connecting cables. Furthermore, the connecting cables do not need to pass through the heat dissipation duct, further reducing the length of the connecting cables, requiring less copper busbar, and lowering costs.

[0051] In one embodiment of this utility model, the AC bus 210 is disposed at the bottom of the second mounting cavity 120, and the AC output terminal 310 and the AC bus 210 are arranged side by side in the direction from the front to the back of the cabinet 100. Thus, in the direction from the front to the back of the cabinet 100, the AC output terminal 310 and the AC bus 210 are directly opposite each other, resulting in a shorter connection distance and further reducing the length of the connecting cable. Specifically, the front of the cabinet 100 refers to the surface of the integrated system facing the user during use, while the back of the cabinet 100 refers to the surface of the integrated system facing away from the user during use. Furthermore, the integrated system typically needs to be connected to an external transformer, i.e., the electrical component 200 is electrically connected to the transformer. In this case, the front of the cabinet 100 is the surface facing away from the transformer, while the back of the cabinet 100 is the surface facing the transformer.

[0052] In one embodiment, the back of the cabinet 100 is provided with a wiring port for connecting an external transformer. Since the AC bus 210 is located close to the back of the cabinet 100, the cables leading out from the AC bus 210 can directly pass through the wiring port to connect to the transformer, without the need for winding cables inside the cabinet 100. The length of the connecting cable between the AC bus 210 and the transformer is shorter, less copper busbar is used, and the cost is lower.

[0053] In one embodiment of this utility model, the electrical component 200 further includes an AC switch 220, which is electrically connected to the AC bus 210. Thus, the AC switch 220 enables switching control of the AC output, making it more convenient to use. Optionally, the AC switch 220 can be positioned to the side or above the AC bus 210. Further, positioning the AC switch 220 directly above the AC bus 210 can further reduce wiring length, reduce copper busbar usage, and lower costs.

[0054] In one embodiment of this utility model, a DC wiring compartment is provided at the lower part of the front of the cabinet 100, and the inverter module 300 is provided with a DC input terminal, which is located in the DC wiring compartment. It can be understood that the inverter module 300 has a side DC input method, with the cable entering from the bottom side and then extending upwards into the DC wiring compartment to connect with the DC input terminal. This facilitates DC cable entry and is closer to the battery compartment, saving on the length of the DC input cable.

[0055] In one embodiment of this utility model, the second mounting cavity 120 includes an air inlet cavity 121 and an electrical cavity 122. The air inlet cavity 121 and the electrical cavity 122 are sealed and separated by an obliquely arranged partition or the like. The air inlet cavity 121 is also connected to the first mounting cavity 110, and the electrical component 200 is disposed in the electrical cavity 122. Thus, the electrical component can be disposed in a separate electrical cavity 122, avoiding the adverse effects of airflow in the air inlet cavity 121 on the electrical component 200 in the electrical cavity 122, ensuring the normal operation of the electrical component 200, and improving the protection level. Furthermore, the air inlet cavity 121 is connected to the outside air, and the airflow flowing in from the air inlet cavity 121 can enter the first mounting cavity 110, using air cooling to dissipate heat from the first heat exchanger 410, making the heat exchange efficiency of the first heat exchanger 410 higher, thereby improving the heat dissipation effect.

[0056] In one embodiment of this utility model, the integrated system further includes a second heat exchanger 500. A portion of the second heat exchanger 500 is disposed in the electrical cavity 122 to absorb heat from the electrical component 200, while the remaining portion is disposed within the air inlet cavity 121. Thus, the portion of the second heat exchanger 500 located within the electrical cavity 122 can absorb heat from the air within the electrical cavity 122, i.e., absorb surface heat from the electrical component 200, achieving heat dissipation and ensuring normal operation of the electrical component 200. The absorbed heat is transferred to the portion of the second heat exchanger 500 located within the air inlet cavity 121, where the air flowing over its surface carries away the heat, achieving cooling. Therefore, the airflow entering from the air inlet cavity 121 flows sequentially through the second heat exchanger 500 and the first heat exchanger 410, achieving simultaneous heat dissipation from both the second heat exchanger 500 and the first heat exchanger 410, reducing the number of components and further simplifying the structure. In one embodiment of this utility model, referring to… Figure 2The integrated system further includes a fan module 710, which is disposed in the first mounting cavity 110 and located above the first heat exchanger 410. Thus, the fan module 710 can accelerate airflow near the first heat exchanger 410, removing heat from the surface of the first heat exchanger 410 through air cooling, thereby cooling the refrigerant in the first heat exchanger 410. It can also absorb more heat from the coolant in the liquid cooling pipe 610, thereby improving the cooling effect of the coolant in the liquid cooling pipe 610.

[0057] In one embodiment of this utility model, reference is made to Figure 2 The top wall of the first mounting cavity 110 is provided with a mounting port. The fan module 710 includes a fan body 711 disposed at the mounting port and a fan housing 712 covering the fan body 711. The top wall and / or side wall of the fan housing 712 are provided with air outlets. This creates an effective airflow channel from the air inlet cavity 121 to the air outlet inside the cabinet 100, allowing the air in the air inlet cavity 121 to exchange heat smoothly with the first heat exchanger 410, effectively absorbing the surface heat of the first heat exchanger 410 and cooling the refrigerant in the first heat exchanger 410. Furthermore, the fan housing 712 protects the fan body 711 from external factors, improving safety during use. Additionally, air outlets can be provided on the top wall and / or side wall of the fan housing 712, depending on the actual situation, to ensure smooth airflow. Optionally, the fan body 711 is an axial flow fan, which can achieve upward exhaust, improving exhaust efficiency.

[0058] In one embodiment of this utility model, reference is made to Figure 2 The integrated system also includes a ventilation mesh 720, with the air outlet located on the top wall of the fan housing 712, and the ventilation mesh 720 positioned at the air outlet. In this way, while ensuring airflow, it can also block snowflakes in winter, preventing them from freezing onto the fan body 711. It is understood that snowflakes falling onto the ventilation mesh 720 can melt under the influence of the hot air blown from the fan body 711. Optionally, the ventilation mesh 720 is made of wire mesh.

[0059] In one embodiment of this utility model, reference is made to Figure 2 and Figure 3The integrated system also includes a water tank 620 and a water pump 630. The water tank 620 is located on top of the cabinet 100 and is arranged side by side with the fan module 710. The water pump 630 is located in the first mounting cavity 110 and is connected to the liquid cooling pipeline 610. Thus, the water tank 620 can replenish the liquid cooling pipeline 610 with coolant, preventing insufficient coolant in the pipeline 610 from affecting heat dissipation. The water pump 630 can accelerate the flow of coolant and absorb the heat from the inverter module 300 in a timely manner. Furthermore, the water tank 620's location on top of the cabinet 100 and its side-by-side arrangement with the fan module 710 further reduces the space occupied.

[0060] To achieve the above objectives, this utility model provides an integrated energy storage unit, which includes a transformer and the aforementioned string converter integrated system. The transformer and the electrical component 200 are electrically connected. Specifically, the specific structure of the string converter integrated system is as described in the above embodiments. Since this integrated energy storage unit adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0061] In one embodiment of this utility model, there are at least two string converter integrated systems, arranged side by side. By using multiple string converter integrated systems arranged side by side, a compact layout of the energy storage unit is achieved, effectively reducing the equipment's footprint. Furthermore, the multiple string converter integrated systems operate in parallel, serving as backups for each other. If one converter fails or requires maintenance, the remaining converters can continue to operate, effectively improving system reliability. Specifically, the side-by-side arrangement of multiple integrated systems refers to the sequential arrangement of multiple integrated systems in a predetermined direction, i.e., a linear array arranged in that predetermined direction.

[0062] In some embodiments, the transformer has a length direction and a width direction, and at least two string converter integrated systems are arranged adjacent to each other in the width direction of the transformer.

[0063] In some embodiments, the number of string converter integrated systems is two.

[0064] In one embodiment of this utility model, the cabinet 100 of the string converter integrated system has a wiring port on its back, through which cables electrically connecting the transformer and the electrical components 200 pass. Thus, the transformer and electrical components 200 are connected via wiring ports on their opposite surfaces, significantly improving wiring convenience, further reducing wiring distance, and thereby saving on the amount of cables, copper busbars, etc., and consequently reducing costs.

[0065] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model embodiments. Any equivalent structural transformations made under the technical concept of the present utility model using the description and drawings of the present utility model embodiments, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model embodiments.

Claims

1. A string converter integrated system, characterized in that, The string converter integrated system includes: The server rack is provided with a first mounting cavity, a second mounting cavity, and a third mounting cavity from top to bottom; Electrical components are disposed in the second mounting cavity; A converter module is disposed in the third mounting cavity, and multiple converter modules are arranged side by side, and the multiple converter modules are electrically connected to the electrical components; A heat dissipation structure is provided in the first mounting cavity, and the heat dissipation structure is used to dissipate the heat generated by the inverter module from the cabinet.

2. The string converter integrated system as described in claim 1, characterized in that, The heat dissipation structure includes a first heat exchanger disposed in the first mounting cavity, and the integrated system further includes a liquid cooling pipeline, which connects the first heat exchanger and the converter module.

3. The string converter integrated system as described in claim 1, characterized in that, Each of the converter modules is provided with an AC output terminal on its top, and the electrical components include an AC bus, the AC output terminal and the AC bus being electrically connected.

4. The string converter integrated system as described in claim 3, characterized in that, The AC busbar is located at the bottom of the second mounting cavity, and the AC output terminals and the AC busbar are arranged side by side in the direction from the front to the back of the cabinet.

5. The string converter integrated system as described in claim 3, characterized in that, The back of the cabinet has a wiring port for connecting an external transformer.

6. The string converter integrated system as described in claim 3, characterized in that, The electrical components also include an AC switch, which is electrically connected to the AC bus.

7. The string converter integrated system as described in claim 1, characterized in that, The lower part of the front of the cabinet is provided with a DC wiring compartment, and the inverter module is provided with a DC input terminal, which is located in the DC wiring compartment.

8. The string converter integrated system as described in claim 1, characterized in that, The second mounting cavity includes an air inlet cavity and an electrical cavity. The air inlet cavity is also connected to the first mounting cavity, and the electrical components are disposed in the electrical cavity.

9. The string converter integrated system as described in claim 8, characterized in that, The integrated system also includes a second heat exchanger, part of which is located in the electrical cavity to absorb heat from the electrical components, and the remainder of which is located in the air inlet cavity.

10. The string converter integrated system as described in claim 2, characterized in that, The integrated system also includes a fan module, which is disposed in the first mounting cavity and located above the first heat exchanger.

11. The string converter integrated system as described in claim 10, characterized in that, The top wall of the first mounting cavity is provided with a mounting port. The fan module includes a fan body located at the mounting port and a fan cover covering the fan body. The top wall and / or side wall of the fan cover are provided with an air outlet.

12. The string converter integrated system as described in claim 11, characterized in that, The integrated system also includes a ventilation mesh, and the air outlet is provided on the top wall of the fan housing, with the ventilation mesh located at the air outlet.

13. The string converter integrated system as described in claim 2, characterized in that, The integrated system also includes a water tank and a water pump. The water tank is located on the top of the cabinet, and the water pump is located in the first mounting cavity and connected to the liquid cooling pipeline.

14. An integrated energy storage unit, characterized in that, The energy storage unit includes a transformer and a string converter integrated system as described in any one of claims 1 to 13, wherein the transformer and the electrical components are electrically connected.

15. The integrated energy storage unit as described in claim 14, characterized in that, The string converter integrated system comprises at least two such systems, which are arranged side by side.

16. The integrated energy storage unit as described in claim 14, characterized in that, The back of the cabinet of the string converter integrated system is positioned opposite to the transformer. The surface of the cabinet facing the transformer has a wiring port, through which cables electrically connecting the transformer and the electrical components pass.

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