A power conversion device and an energy storage system

Abstract

The application provides a power conversion device and an energy storage system. The power conversion device comprises a cabinet body and a plurality of PCSs. The plurality of PCSs comprises a first PCS and a second PCS. The first PCS is located on the top of the second PCS, and the first PCS and the second PCS are arranged along the length direction respectively. The PCS has an air inlet and an air outlet, the air inlet is located at the bottom of the PCS, and the air outlet is located at the top of the PCS. The cabinet body is provided with a first baffle plate located between the adjacent first PCS and second PCS. The first baffle plate is used for isolating the air inlet of the first PCS from the air outlet of the second PCS. When the power conversion device works, each PCS dissipates heat, wherein the air flow of the air outlet of the lower second PCS is isolated from the air inlet of the first PCS under the guidance of the first baffle plate, so that the exhaust air flow of the second PCS does not affect the heat dissipation of the first PCS, thereby improving the heat dissipation effect while realizing high integration.

Description

Technical Field

[0001] This application relates to the field of energy technology, and in particular to a power conversion device and an energy storage system. Background Technology

[0002] Typically, a power plant energy storage system can include multiple string power conversion systems (PCSs). The outputs of multiple string PCSs can be connected in parallel to form a subarray and then connected to the power grid. Existing string PCSs are mostly installed using racks or low-integration containers. To improve the integration of energy storage power plants, the container can be divided into upper and lower layers along its height. Each layer can hold multiple PCSs. PCSs require heat dissipation during operation, and each PCS uses a bottom-intake, top-exhaust cooling method. Therefore, the hot airflow exhausted from the lower PCS may affect the airflow intake of the upper PCS, leading to thermal coupling and resulting in poor heat dissipation for the upper PCS. Utility Model Content

[0003] This application provides a power conversion device and an energy storage system that improves the integration of the power conversion device while achieving better heat dissipation.

[0004] In a first aspect, this application provides a power conversion device. The power conversion device includes a cabinet and a plurality of energy storage converters located within the cabinet. The plurality of energy storage converters includes at least one first energy storage converter and at least one second energy storage converter. The at least one first energy storage converter is located above the at least one second energy storage converter along the height direction of the cabinet, and the at least one first energy storage converter is arranged along the length direction of the cabinet, as are the at least one second energy storage converter. Each of the plurality of energy storage converters has an air inlet and an air outlet, with the air inlet located at the bottom of each energy storage converter and the air outlet located at the top of each energy storage converter. A first baffle is provided within the cabinet, located between adjacent first and second energy storage converters along the height direction. The first baffle is used to isolate the air inlet of the first energy storage converter from the air outlet of the second energy storage converter.

[0005] In this application, the cabinet of the power conversion device can integrate multiple PCS, thereby improving the integration and energy density of the power conversion device. When the power conversion device is in operation, each PCS draws in air from the bottom air inlet. After the airflow exchanges heat with the PCS through the internal air duct, it is discharged from the top air outlet. At this time, in any adjacent first and second PCS along the height direction of the cabinet, the airflow discharged from the air outlet of the lower second PCS is isolated from the air inlet of the upper first PCS under the guidance of the first baffle plate, without affecting the heat dissipation efficiency of the first PCS, thereby avoiding thermal coupling between the upper and lower PCS.

[0006] In one embodiment, each energy storage converter includes a top surface, a bottom surface, and four side surfaces. The top and bottom surfaces are arranged opposite each other, and the four side surfaces are sequentially connected and connected between the top and bottom surfaces. An air inlet is provided on the bottom surface, and at least one of the four side surfaces is provided with an air outlet, which is adjacent to the top surface. A first baffle plate is set at an angle to the height direction of the cabinet. One end of the first baffle plate extends to one side of the first energy storage converter, and the other end extends to one side of the second energy storage converter. The first and second energy storage converters are located on opposite sides of the first baffle plate.

[0007] In one embodiment, the cabinet includes a base plate located below a plurality of energy storage converters. The plurality of energy storage converters includes two sets of second energy storage converters arranged along the width direction of the cabinet. Each set of second energy storage converters includes at least one second energy storage converter arranged along the length direction of the cabinet. Any two adjacent second energy storage converters in the two sets of second energy storage converters along the width direction are respectively provided with a second baffle plate. The second baffle plate is located on the side of the second energy storage converter facing the adjacent second energy storage converter and is connected between the second energy storage converter and the base plate. The second baffle plate is used to isolate the air inlet of the second energy storage converter from the airflow between the two second energy storage converters. In this embodiment, a predetermined distance is spaced between two adjacent second energy storage converters. When one of the second energy storage converters is dissipating heat, the airflow discharged from that second energy storage converter will flow back between the two adjacent second energy storage converters to the bottom of the second energy storage converter. Therefore, the second baffle can prevent the return airflow from entering the second energy storage converter, thus avoiding thermal coupling.

[0008] In one embodiment, the second baffle extends along its length and isolates the air inlet of each group of second energy storage converters from the airflow between the two groups of second energy storage converters. Thus, all the second energy storage converters in each group can share a single second baffle, thereby simplifying the structure of the power conversion equipment and reducing the manufacturing cost of the cabinet.

[0009] In one embodiment, a first baffle plate extends along the length direction and isolates the air inlet of at least one first energy storage converter from the air outlet of at least one second energy storage converter. Thus, when multiple energy storage converters include multiple first energy storage converters and multiple second energy storage converters arranged along the length direction, the multiple first energy storage converters and the multiple second energy storage converters can share a single first baffle plate, thereby simplifying the structure of the power conversion equipment and reducing the manufacturing cost of the cabinet.

[0010] In one embodiment, the cabinet also includes at least one distribution cabinet, which is arranged along the length of the at least one second energy storage converter. Each of the at least one distribution cabinet is provided with a distribution cabinet busbar, and the plurality of energy storage converters are connected to the input terminal of the distribution cabinet busbar via cables. A main busbar is provided inside the cabinet, located at the bottom of the at least one distribution cabinet and the at least one second energy storage converter in the height direction. The main busbar is connected to the output terminal of the distribution cabinet busbar. Each of the at least one distribution cabinet can control one or more energy storage converters, thereby realizing centralized control of multiple energy storage converters.

[0011] In one embodiment, each distribution cabinet is also equipped with a fuse. The fuse connects the cable to the output terminal of the distribution cabinet busbar. Thus, when a short circuit occurs on one side of the cable connected to the fuse, or at one end connected to the distribution cabinet busbar, the fuse can be blown, preventing the fault from spreading. Furthermore, the fuse can be fixedly connected to the distribution cabinet busbar, providing high mechanical strength and more stable contact resistance; and it occupies less space, simplifying the internal structure of the distribution cabinet.

[0012] In one embodiment, the power conversion device is equipped with a connecting busbar for outputting electrical energy to the transformer substation or load. The main busbar is connected to the connecting busbar. In this embodiment, the output of the power conversion device can also be via a busbar, thereby achieving cable-free connection between the power conversion device and external devices.

[0013] In one embodiment, the cabinet is a standard 20-foot container frame structure to achieve high power density in a standard-sized container.

[0014] Secondly, this application also provides an energy storage system. The energy storage system includes an energy storage cabinet, a transformer substation, and the power conversion device described in the first aspect. The energy storage cabinet, power conversion device, and transformer substation are connected sequentially. The energy storage cabinet includes at least one battery cluster. The power conversion device is used to convert the electrical energy output from an external power source and then transmit it to the energy storage cabinet, and to convert the electrical energy output from the energy storage cabinet and then transmit it to the load or power grid via the transformer substation.

[0015] In one embodiment, the power conversion device is provided with a first connecting busbar, and the transformer substation is provided with a second connecting busbar, with the first connecting busbar connected to the second connecting busbar. In this embodiment, the output of the power conversion device can also be provided via a busbar, thereby achieving a cable-free connection between the power conversion device and the transformer substation, simplifying the cable layout of the energy storage system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an energy storage system according to one embodiment of this application;

[0017] Figure 2 This is a schematic diagram of a power conversion device according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of a power conversion device according to another embodiment of this application;

[0019] Figure 4 for Figure 2 Side view of a medium power conversion device;

[0020] Figure 5 for Figure 2 A schematic diagram of an embodiment of a medium power conversion device along the AA direction;

[0021] Figure 6 for Figure 3 A schematic diagram of an embodiment of a medium power conversion device along the BB direction;

[0022] Figure 7 This is a schematic diagram of the first windbreak panel according to one embodiment of this application;

[0023] Figure 8 for Figure 2 A schematic diagram of another embodiment of a medium power conversion device along the AA direction;

[0024] Figure 9 for Figure 3 A schematic diagram of another embodiment of a medium-power conversion device along the B-direction;

[0025] Figure 10 This is a schematic diagram of the heat dissipation of a power conversion device according to an embodiment of this application;

[0026] Figure 11 This is a schematic diagram of the heat dissipation of a power conversion device according to another embodiment of this application;

[0027] Figure 12 This is a schematic diagram of the second space of a power conversion device according to another embodiment of this application;

[0028] Figure 13 for Figure 12A partial schematic diagram of a power conversion device;

[0029] Figure 14 This is a partial schematic diagram of a power conversion device according to another embodiment of this application.

[0030] Figure label:

[0031] 10-Energy Storage System

[0032] 11-Energy Storage Cabinet

[0033] 12-Power Conversion Equipment

[0034] 13-Box-type substation

[0035] 121-Cabinet

[0036] 122-Energy Storage Converter

[0037] 123-First windshield

[0038] 124 - Second wind deflector

[0039] 125-Distribution Cabinet

[0040] 126-Distribution cabinet busbar

[0041] 127-Main Busbar

[0042] 121a-First Space

[0043] 121b - Corridor

[0044] 121c - Second Space

[0045] 122a-First Energy Storage Converter

[0046] 122b - Second Energy Storage Converter Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0048] To facilitate understanding of the power conversion device and energy storage system provided in the embodiments of this application, their application scenarios are described below. The energy storage system of this application can be applied to industrial and commercial energy storage or power plant energy storage power supply systems. Figure 1 This is a schematic diagram of an energy storage system according to one embodiment of this application. Figure 1As shown, the energy storage system 10 may include an energy storage cabinet 11, a power conversion device 12, and a transformer substation 13. The energy storage cabinet 11 houses at least one battery cluster. The DC side of the power conversion device 12 is connected to the energy storage cabinet 11, and the AC side of the power conversion device 12 is connected to the transformer substation 13. The power conversion device 12 is used to convert the electrical energy output from an external power source and deliver it to the battery cluster within the energy storage cabinet 11, and to convert the electrical energy output from the battery cluster within the energy storage cabinet 11 and deliver it to a load or the power grid. The transformer substation 13 is used for voltage matching between the power conversion device 12 and the power grid. In one embodiment, the power conversion device 12 may be a PCS integrated cabinet, and the transformer substation 13 may be a static transfer switch (STS). The power conversion device 12 and the transformer substation 13 may be integrated into a PCS+STS unit.

[0049] In addition, the energy storage system 10 may also include an energy management system (EMS), a power plant controller (PPC), and a dispatch training simulator (DTS). The EMS can connect to the energy storage cabinet 11, power conversion equipment 112, transformer substation 13, and PPC. The EMS is used for energy optimization management of the energy storage system 10, maximizing its economic benefits or energy utilization rate based on factors such as battery status, load demand, or electricity price. The DTS can connect to the energy storage cabinet 11 and transformer substation 13, simulating the operating environment and grid dispatch scenarios of the energy storage system 10 to help staff become familiar with the operating procedures, dispatch strategies, and ability to handle various abnormal conditions. The PPC serves as the core control unit of the energy storage system 10, primarily responsible for communicating with the grid dispatch center and receiving and executing dispatch instructions. The PPC can coordinate internal equipment of the energy storage system 10 (such as the PCS and battery management system) to ensure stable operation of the energy storage system 10 and to achieve functions such as grid frequency regulation, power balancing, and peak shaving / valley filling.

[0050] To improve power density, existing power plant PCS (Power Control System) uses shipping containers as the cabinet. The containers are divided into upper and lower layers along the height. Each layer can hold multiple PCS. When the power plant PCS is operating, it requires heat dissipation. Each PCS uses a bottom-in, top-out cooling method. However, the hot air exhausted from the lower PCS may enter the cooling path of the upper PCS, causing thermal coupling between the two PCS layers, resulting in poor heat dissipation performance of the upper PCS.

[0051] In view of this, this application provides a power conversion device and an energy storage system that improves the integration of the power conversion device while achieving better heat dissipation.

[0052] It should be noted that the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0053] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0054] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0055] Furthermore, in this article, directional terms such as "top," "bottom," "upper," and "lower" are defined relative to the orientation of the structure as shown in the attached figures. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the structure.

[0056] Figure 2 This is a schematic diagram of a power conversion device according to an embodiment of this application. Figure 3 This is a schematic diagram of a power conversion device according to another embodiment of this application. Figure 2 and Figure 3As shown, the power conversion device 12 specifically includes a cabinet 121 and multiple energy storage converters 122, which are located inside the cabinet 121. In this embodiment, the cabinet 121 can be a standard 20-foot standard box frame structure, or it can be a non-standard size frame structure. The internal space of the cabinet 121 is divided into two stacked spaces along the height direction H of the cabinet 121. The upper space is provided with at least one first energy storage converter 122a arranged along the length direction L of the cabinet 121, and the lower space is provided with at least one second energy storage converter 122b arranged along the length direction L of the cabinet 121.

[0057] Figure 4 for Figure 2 Side view of a medium-power conversion device. (e.g.) Figure 4 As shown, each energy storage converter 122 has an air inlet and an air outlet. The air inlet is located at the bottom of each energy storage converter 122, and the air outlet is located at the top of each energy storage converter 122. Figure 3 As shown by the dashed arrow, when the power conversion device 12 is in operation, each energy storage converter 122 takes in air from the bottom air inlet. After the airflow passes through the internal air duct of the energy storage converter 122 and exchanges heat with the energy storage converter 122, it is discharged from the top air outlet.

[0058] Figure 5 for Figure 2 A schematic diagram of one embodiment of a medium power conversion device along the AA direction. Figure 6 for Figure 3 A schematic diagram of one embodiment of a medium-power conversion device along the BB direction. (See diagram below.) Figure 5 and Figure 6 As shown, a first baffle plate 123 is provided inside the cabinet 121. The first baffle plate 123 is located between the first energy storage converter 122a and the second energy storage converter 122b, which are adjacent along the height direction H. The first baffle plate 123 is used to isolate the air inlet of the first energy storage converter 122a from the air outlet of the second energy storage converter 122b. In this application, the cabinet 121 of the power conversion device 12 can integrate multiple energy storage converters 122, thereby improving the integration of the power conversion device 12 and increasing the energy density of the power conversion device 12.

[0059] When the power conversion device 12 is in operation, each energy storage converter 122 receives air from the bottom air inlet. The airflow exchanges heat with the energy storage converter 122 through the internal air duct and is then discharged from the top air outlet. At this time, in any adjacent first energy storage converter 122a and second energy storage converter 122b along the height direction H, the airflow discharged from the air outlet of the lower second energy storage converter 122b is isolated from the air inlet of the upper first energy storage converter 122a under the guidance of the first baffle plate 123, without affecting the heat dissipation efficiency of the first energy storage converter 122a, thereby avoiding thermal coupling between the upper and lower energy storage converters 122.

[0060] In the above embodiments, each energy storage converter 122 includes a top surface, a bottom surface, and four side surfaces. The top and bottom surfaces are arranged opposite each other, and the four side surfaces are sequentially connected between the top and bottom surfaces. The bottom surface has an air inlet, and at least one of the four side surfaces of the energy storage converter 122 has an air outlet, which is adjacent to the top surface. Therefore, the energy storage converter 122 can have one, two, three, or four air outlets.

[0061] like Figure 4 As shown, the first baffle plate 123 is set at an angle to the height direction H of the cabinet 121. That is, the first baffle plate 123 is set at an angle relative to the height direction H, so that while guiding the flow direction of the airflow discharged from the second energy storage converter 122b, it does not affect the air intake of the first energy storage converter 122a.

[0062] Figure 7 This is a schematic diagram of a first windbreak panel according to an embodiment of this application. Figure 7 As shown, the first wind deflector 123 can have a Z-shaped structure. One end 123a of the first wind deflector 123 can extend to one side of the first energy storage converter 122a, and the other end 123b of the first wind deflector 123 can extend to one side of the second energy storage converter 122b, so that the first energy storage converter 122a and the second energy storage converter 122b are located on both sides of the first wind deflector 123, thereby isolating the air intake of the first energy storage converter 122a from the air outlet of the second energy storage converter 122b.

[0063] In this application, the cabinet 121 can be a frame structure of a shipping container. Specifically, the cabinet 121 may include a floor plate. The floor plate is located below the multiple energy storage converters 122. The floor plate can be a grid-like floor plate, or it can be a flat plate. Figure 2As shown, in one embodiment, the cabinet 121 may have a first space 121a, a passageway 121b, and a second space 121c arranged sequentially along the width direction W, and the bottom plate may be the floor of the passageway 121b. The first space 121a and the second space 121c are both divided into two adjacent upper and lower spaces along the height direction H.

[0064] In one embodiment, the upper space of the first space 121a and the second space 121c may be provided with 14 first energy storage converters 122a, and the lower space of the first space 121a and the second space 121c may be provided with 7 second energy storage converters 122b. Therefore, the power conversion device 12 of this embodiment can accommodate 42 energy storage converters 122.

[0065] In the above embodiment, one end 123a of the first baffle 123 extends to the side of the first energy storage converter 122a facing the passageway 121b, and the other end 123b of the first baffle 123 extends to the side of the second energy storage converter 122b away from the passageway 121b. Thus, the airflow discharged from the second energy storage converter 122b flows along the surface of the first baffle 123 to the passageway 121b.

[0066] like Figure 2 and Figure 3 As shown, in the above embodiment, the plurality of energy storage converters 122 may include two sets of second energy storage converters 122b arranged along the width direction W of the cabinet 121, wherein one set of second energy storage converters 122b is located in the lower space of the first space 121a, and the other set of second energy storage converters 122b is located in the lower space of the second space 121c.

[0067] Figure 8 for Figure 2 A schematic diagram of another embodiment of a medium power conversion device along the AA direction. Figure 9 for Figure 3 A schematic diagram of another embodiment of a medium-power conversion device along the B-direction. (See diagram below.) Figure 8 and Figure 9 As shown, in the two sets of second energy storage converters 122b, any two adjacent second energy storage converters 122b along the width direction W are respectively provided with a second baffle plate 124. For each of the two second energy storage converters 122b, the second baffle plate 124 is located on the side of the second energy storage converter 122b facing the adjacent second energy storage converter 122b, and is connected between the second energy storage converter 122b and the base plate. The second baffle plate 124 is used to isolate the air inlet of the second energy storage converter 122b from the airflow between the two second energy storage converters 122b. In this embodiment, the second baffle plate 124 can be a square flat plate.

[0068] Figure 10 This is a schematic diagram of the heat dissipation of a power conversion device according to an embodiment of this application. Figure 11 This is a schematic diagram of the heat dissipation of a power conversion device according to another embodiment of this application, wherein, Figure 10 No second wind deflector was installed. Figure 11 A second wind deflector is provided. For example... Figure 10 and Figure 11 As shown, specifically, the second baffle 124 is located between the second energy storage converter 122b and the base plate and faces the passageway 121b. The second baffle 124 is used to isolate the air inlet of the second energy storage converter 122b from the airflow in the passageway 121b. When the airflow discharged from the second energy storage converter 122b is guided to the passageway 121b, since the airflow may flow back to the bottom of the second energy storage converter 122b in the passageway 121b, the second baffle 124 can isolate the airflow outside the air inlet, preventing the airflow in the passageway 121b from entering the air inlet of the second energy storage converter 122b, and avoiding thermal coupling of the energy storage converter 122 caused by the close spatial layout of the cabinet 121 with the first space 121a, the passageway 121b and the second space 121c.

[0069] In one embodiment, the first baffle 123 can extend along the length direction L of the cabinet 121, such that the first baffle 123 can isolate the air inlet of at least one first energy storage converter 122a from the air outlet of at least one second energy storage converter 122b. In this embodiment, the first baffle 123 allows multiple first energy storage converters 122a and multiple second energy storage converters 122b on both upper and lower layers to share the same first baffle 123, facilitating installation and simplifying the structure of the power conversion equipment.

[0070] Similarly, the second baffle 124 can extend along the length direction L of the cabinet 121 and isolate the air inlet of each group of second energy storage converters 122b from the airflow of the passageway 121b. In this embodiment, the second baffle 124 allows multiple second energy storage converters 122b arranged along the length direction L to share the same second baffle 124, which facilitates installation and simplifies the structure of the power conversion equipment.

[0071] like Figure 2 and Figure 3 As shown, at least one power distribution cabinet 125 is also provided inside the cabinet 121, and the at least one power distribution cabinet 125 and at least one second energy storage converter 122b are arranged along the length direction L. Figure 12 This is a schematic diagram of the second space of a power conversion device according to another embodiment of this application. Figure 13 for Figure 12 A partial schematic diagram of a power conversion device. (See attached diagram.) Figure 12 and Figure 13As shown, each of the aforementioned at least one distribution cabinet 125 is equipped with a distribution cabinet busbar 126. Multiple energy storage converters 122 are connected to a molded case circuit breaker (MCCB) within the distribution cabinet 125 via cables. The MCCB is connected to the input terminal of the distribution cabinet busbar 126 via copper busbars. A main busbar 127 is provided inside the cabinet body 121, located at the bottom of the distribution cabinet 125 and the second energy storage converter 122b in the height direction H. The main busbar 127 is connected to the output terminal of the distribution cabinet busbar 126. In this embodiment, the design of the main busbar 127 reduces AC cables, simplifying the cable layout of the power conversion device 12.

[0072] Each distribution cabinet 125 is also equipped with a fuse. The fuse connection cable is connected to the output terminal of the distribution cabinet busbar 126. This way, if a short circuit occurs on one side of the fuse connection cable or at one end of the fuse connection to the distribution cabinet busbar 126, the fuse will melt, preventing the fault from spreading. Furthermore, the fuse can be fixedly connected to the distribution cabinet busbar 126, providing high mechanical strength and more stable contact resistance; and it occupies less space, simplifying the internal structure of the distribution cabinet 125.

[0073] In the above embodiment, when multiple distribution cabinets 125 are provided inside the cabinet 121, the multiple distribution cabinets 125 can be arranged at intervals from the second energy storage converter 122b. In this embodiment, the main busbar 127 can be located below the distribution cabinets 125 and the second energy storage converter 122b. The distribution cabinet busbar 126 extends out of the bottom of the distribution cabinet 125 and extends in a direction perpendicular to the base plate, thereby connecting to the main busbar 127.

[0074] Figure 14 This is a partial schematic diagram of a power conversion device according to another embodiment of this application. Figure 14 As shown, in another embodiment, when multiple distribution cabinets 125 are provided inside the cabinet 121, the multiple distribution cabinets 125 can be arranged adjacent to each other, and multiple second energy storage converters 122b are located on one or both sides of the aforementioned multiple distribution cabinets 125 along the length direction L. The distribution cabinet busbars 126 of two adjacent distribution cabinets 125 are connected by copper busbars. The copper busbars can be rigid copper busbars or flexible copper busbars.

[0075] Furthermore, the power conversion device 12 may be equipped with a first connecting busbar, and the main busbar 127 is connected to the first connecting busbar. The transformer substation 13 may be equipped with a second connecting busbar, and the first connecting busbar and the second connecting busbar may be directly connected, or they may be connected through a third connecting busbar located outside the power conversion device 12 and the transformer substation 13. In this way, a cable-free design can be achieved between the power conversion device 12 and the transformer substation 13, simplifying the cable layout of the energy storage system 10.

[0076] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power conversion device, characterized in that, Includes a cabinet and multiple energy storage converters located within the cabinet, wherein: The plurality of energy storage converters include at least one first energy storage converter and at least one second energy storage converter; the at least one first energy storage converter is located on top of the at least one second energy storage converter along the height direction of the cabinet, the at least one first energy storage converter is arranged along the length direction of the cabinet, and the at least one second energy storage converter is arranged along the length direction. Each of the plurality of energy storage converters has an air inlet and an air outlet, the air inlet being located at the bottom of each energy storage converter and the air outlet being located at the top of each energy storage converter; The cabinet is equipped with a first wind baffle, which is located between the first energy storage converter and the second energy storage converter that are adjacent to each other along the height direction. The first wind baffle is used to isolate the air inlet of the first energy storage converter from the air outlet of the second energy storage converter.

2. The power conversion device as described in claim 1, characterized in that, Each energy storage converter includes a top surface, a bottom surface, and four side surfaces. The top surface and the bottom surface are arranged opposite to each other, and the four side surfaces are connected in sequence between the top surface and the bottom surface. The bottom surface is provided with the air inlet, and at least one of the four side surfaces is provided with the air outlet. The air outlet is arranged adjacent to the top surface. The first wind deflector is set at an angle to the height direction, one end of the first wind deflector extends to one side of the first energy storage converter, and the other end of the first wind deflector extends to one side of the second energy storage converter; the first energy storage converter and the second energy storage converter are located on both sides of the first wind deflector.

3. The power conversion device as described in claim 2, characterized in that, The cabinet includes a base plate located below the plurality of energy storage converters. The plurality of energy storage converters include two sets of second energy storage converters arranged along the width direction of the cabinet. Each set of second energy storage converters includes at least one second energy storage converter arranged along the length direction. Two adjacent second energy storage converters in the two sets of second energy storage converters along the width direction are respectively provided with a second wind deflector. The second wind deflector is located on the side of the second energy storage converter facing the adjacent second energy storage converter, and the second wind deflector is connected between the second energy storage converter and the base plate. The second wind deflector is used to isolate the airflow between the air inlet of the second energy storage converter and the two second energy storage converters.

4. The power conversion device as described in claim 3, characterized in that, The second baffle extends along the length direction and isolates the airflow between the air inlet of each group of second energy storage converters and the two groups of second energy storage converters.

5. The power conversion device as described in any one of claims 1 to 4, characterized in that, The first baffle extends along the length direction and isolates the air inlet of the at least one first energy storage converter and the air outlet of the at least one second energy storage converter.

6. The power conversion device as described in any one of claims 1 to 5, characterized in that, The cabinet also contains at least one power distribution cabinet, which is arranged along the length of the at least one second energy storage converter. Each of the at least one power distribution cabinet is provided with a power distribution cabinet busbar, and the plurality of energy storage converters are connected to the input end of the power distribution cabinet busbar via cables. The cabinet also contains a main busbar, which is located at the bottom of the at least one power distribution cabinet and the at least one second energy storage converter in the height direction. The main busbar is connected to the output end of the power distribution cabinet busbar.

7. The power conversion device as described in claim 6, characterized in that, Each distribution cabinet is equipped with a fuse, which connects the cable to the input terminal of the distribution cabinet busbar.

8. The power conversion device as described in claim 6 or 7, characterized in that, The power conversion device is equipped with a connecting busbar, which is used to output electrical energy to the transformer or load; the main busbar is connected to the connecting busbar.

9. An energy storage system, characterized in that, The device includes an energy storage cabinet, a transformer substation, and a power conversion device as described in any one of claims 1 to 8, wherein the energy storage cabinet, the power conversion device, and the transformer substation are connected in sequence; the power conversion device is used to convert the electrical energy output from an external power source and then transmit it to the energy storage cabinet, and to convert the electrical energy output from the energy storage cabinet and then transmit it to the load or the power grid through the transformer substation.

10. The energy storage system as described in claim 9, characterized in that, The power conversion device is provided with a first connecting busbar, and the transformer substation is provided with a second connecting busbar, wherein the first connecting busbar and the second connecting busbar are connected.

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