A 35kV high-voltage direct-hanging system cascade energy storage cabin

Abstract

This invention belongs to the field of energy storage technology, specifically relating to a cascaded energy storage compartment for a 35kV high-voltage direct-connection system. It includes: a compartment body (1), a liquid-cooled unit (2), liquid-cooled pipes (3), a battery system (4), a fire protection system (5), and a low-voltage cabinet (11). The battery system (4) consists of multiple rows of batteries, arranged in single rows of two clusters, vertically, with high-strength insulating plates separating the upper and lower clusters. Insulating sleeves are also used to isolate long screws, achieving a rigid connection between the upper and lower cluster frames and insulation between the upper and lower clusters. The upper and lower cluster PCS are placed in the middle. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system of this invention can be compatible with high-voltage direct-connection systems with voltage levels below 35kV, with a single compartment voltage of 12.4kV. Depending on the electrical topology combination of different systems, it can be compatible with 10kV, 24kV, and 35kV systems.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a cascaded energy storage compartment for a 35kV high-voltage direct-connection system. Background Technology

[0002] The description of the background art in this invention pertains to related technologies and is used merely for illustration and to facilitate understanding of the invention. It should not be construed as the applicant explicitly believing or presuming that the invention was prior art on the filing date of the first application.

[0003] Currently, energy storage generally uses low-voltage energy storage, which suffers from problems such as circulating current, large efficiency losses, large power plant footprint, system complexity, and slow response speed. In the market, there may be one product for a 10kV system and another for a 35kV system, requiring the development of different models for different customer voltage levels, leading to high costs, long development cycles, and other issues. There are also problems such as complex on-site wiring, additional connections (liquid cooling pipes for liquid-cooled units), complex site layout, and inconvenient maintenance.

[0004] Existing cascaded energy storage modules have poor safety during transportation and are unsuitable for transporting on long routes or roads with poor conditions. Furthermore, existing cascaded energy storage modules suffer from complex inter-cluster wiring, long paths, and high costs. Summary of the Invention

[0005] The purpose of this invention is to provide a cascaded energy storage compartment for a 35kV high-voltage direct-connection system. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system of this invention can be compatible with high-voltage direct-connection systems with voltage levels below 35kV, with a single compartment voltage of 12.4kV. Depending on the electrical topology combination of different systems, it can be compatible with 10kV, 24kV, and 35kV systems.

[0006] The objective of this invention is achieved through the following technical solutions: A cascaded energy storage compartment for a 35kV high-voltage direct-connection system includes: a compartment body, a liquid-cooled unit, liquid-cooled pipes, a battery system, a fire protection system, and a low-voltage cabinet; the battery system consists of multiple rows of batteries, with two clusters per row, arranged vertically, and the upper and lower clusters are isolated by a high-strength insulating plate, while the long screw is isolated by an insulating sleeve to achieve a rigid connection between the upper and lower cluster frames and insulation between the upper and lower clusters; the upper and lower cluster PCS are placed in the middle.

[0007] Furthermore, the cabinet door assembly of the cabin is positioned opposite to the side enclosure panel, with the door opening on only one side of the entire cabin along its length; two air conditioners are installed on the cabinet door assembly; the low-pressure chamber door assembly is located on the low-pressure chamber side.

[0008] Furthermore, the cabinet door assembly consists of a low-pressure compartment door; a container door lock assembly; a fire control window; an external display window for the energy storage compartment; and a fire alarm window. The fire control window includes a manual fire extinguishing button, a manual fan start button, and a combustible gas concentration display. The external display window for the energy storage compartment includes a human-machine interface touchscreen, status indicator lights, and an emergency stop button. The fire alarm window includes an audible and visual alarm and an indicator light for accidental gas release.

[0009] Furthermore, the liquid cooling unit is located in one corner of the cabin, and the coolant is low-conductivity deionized water or pure water; the liquid cooling pipes are made of plastic. The battery system consists of multiple rows of batteries, with the battery pack being a long battery pack, allowing the cabin to be designed as a single-door structure as mentioned above. Each row of batteries consists of an upper battery rack and a lower battery rack. A first insulating plate, a second insulating plate, and a third insulating plate are installed between the upper and lower battery racks. An insulating plate connects the upper and lower battery racks, and an insulating sleeve connects them. Adjacent rows of batteries are supported and connected by a first insulating connecting plate and a second insulating connecting plate between clusters. The second insulating connecting plate between clusters also has openings for connecting to the inner wall of the cabin via an auxiliary transport reinforcing rod.

[0010] Furthermore, a support connection is provided between the battery rack and the cabin. The first auxiliary transport reinforcing rod mainly ensures the stable connection in the Y direction, the second auxiliary transport reinforcing rod ensures the stable connection in the X direction, and the third auxiliary transport reinforcing rod ensures the stable connection in both the X and Y directions. The second reinforcing rod is designed with auxiliary transport second reinforcing rod section a and section b. Adjustable mounting holes are provided. The length of the adjustable mounting holes in the X direction can be adjusted. All PCS of the battery system are installed in the center. The bottom of the battery rack is fixedly connected to the battery cluster fixing bracket through a 35kV battery rack insulating support column. The battery cluster fixing bracket is designed with a series of holes and is fixed to the bottom of the cabin with bolts to achieve the fixation and isolation of the power unit from the cabin in the Z direction.

[0011] Furthermore, the fire protection system includes two parts: water fire protection and gas fire protection. The water fire protection system injects liquid-cooled water from the fire protection interface outside the cabin to irrigate and spray inside the cabin. The gas fire protection system mainly uses heptafluoropropane or perfluorohexanone stored in the fire protection gas tank to spray the battery pack and the cabin through the fire protection pipeline. The cabin shell is also equipped with two exhaust windows, one air intake window, and one pressure relief window to ensure ventilation and air exchange inside the cabin and release the pressure inside the fire protection cabin.

[0012] Furthermore, the low-voltage cabinet contains switches for low-voltage power distribution of the electrical equipment inside the cabin, controllers for related equipment, switches, and UPS power supplies; the switches include circuit breakers, relays, fuses, and switching power supplies; the controllers for the related equipment include the Battery Management System (BAMS) central control unit, the local EMS control host, and the communication management unit.

[0013] Furthermore, the top of the cabin is equipped with access control switches, lighting, emergency lights, and other devices, with the access control switches and lighting working in tandem. The emergency lights are primarily used for emergency lighting when the cabin's power supply is interrupted.

[0014] Furthermore, the linkage function is as follows: when the low-pressure room door assembly is in the open state or not closed tightly, a pair of contacts of the access control switch will close, and the lighting will be turned on, and the corresponding contact information will be fed back to the local EMS control host; when the low-pressure room door assembly is in the closed state, a pair of contacts of the access control switch will open, and the lighting will be turned off, and the corresponding contact information will be fed back to the local EMS control host.

[0015] The embodiments of the present invention have the following beneficial effects: The cascaded energy storage compartment of this invention can be compatible with high-voltage direct-connection systems with voltage levels below 35kV, with a single compartment voltage of 12.4kV. Depending on the electrical topology combination of different systems, it can be compatible with 10kV, 24kV, and 35kV systems. The cascaded energy storage module of this invention adopts a modular design, with a single module integrating a battery system, fire protection system, power distribution system, thermal management system, and local energy management system. This differs from competing solutions that require separate liquid cooling units and separate power distribution. The power station installation and layout are simple, wiring is convenient, and no additional piping is needed, while also facilitating maintenance. The cascaded energy storage module of this invention has high structural strength and can meet the requirements of long-distance transportation. Because the power unit (the entire battery system + PCS unit) inside the module is at high voltage (35kV) to the ground, and the voltage between each sub-power unit (single cluster battery system + PCS unit) is floating, it is required that the battery cluster frame (installing 1 cluster battery + 1 PCS) inside the module has a 35kV insulation distance to the internal metal of the module, and the battery cluster frames have an insulation distance that meets the AC output voltage level of the PCS. All connecting fasteners must be insulated. However, insulated components have lower strength and workability than steel under the same thickness conditions. In order to ensure transportation safety, the battery cluster frame must have a strong connection with the module. The cascaded energy storage module of this invention is designed with a transportation auxiliary reinforcing rod, which is required to be installed before transportation and removed before the equipment is debugged and operated. The cascaded energy storage compartment adopts a long battery pack design, which allows for single-side door opening, higher volumetric energy density, and reduces the amount of copper busbars (cables) used for connections between battery clusters. The cascaded energy storage compartment adopts a single row of two clusters, arranged vertically, with high-strength insulating plates separating the upper and lower clusters. At the same time, insulating sleeves are used to isolate long screws, achieving a rigid bolt connection between the upper and lower cluster frames. This also ensures insulation between the upper and lower clusters. Furthermore, the arrangement of placing the upper and lower cluster PCS in the middle can save on the cost of inter-cluster wiring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a 10kV system in a cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to the present invention; Figure 2 This is a schematic diagram of a 35kV system in a cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to the present invention; Figure 3 This is a schematic diagram of the front external structure of the cascaded energy storage compartment in a 35kV high-voltage direct-connection system according to the present invention. Figure 4 This is a schematic diagram of the front external structure of the cascaded energy storage compartment (including the hatch) in a 35kV high-voltage direct-connection system according to the present invention. Figure 5 This is a schematic diagram of the rear external structure of the cascaded energy storage compartment in a 35kV high-voltage direct-connection system according to the present invention. Figure 6 This is a schematic diagram of the rear external structure of the cascaded energy storage compartment (including the hatch) in a cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to the present invention. Figure 7 This is a top view schematic diagram of the cascaded energy storage compartment (without top cover) in a 35kV high-voltage direct-connection system according to the present invention. Figure 8 This is a schematic diagram of the power unit structure of the cascaded energy storage compartment in a 35kV high-voltage direct-connection system according to the present invention. Figure 9 This is a schematic diagram of the battery rack assembly structure of the cascaded energy storage compartment in a 35kV high-voltage direct-connection system according to the present invention. Figure 10 This is a schematic diagram of a single-row battery rack structure in a cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to the present invention. Figure 11 This invention relates to a cascaded energy storage compartment for a 35kV high-voltage direct-connection system. Figure 10 A magnified view of point I in the image; Figure 12 This is a schematic diagram of the auxiliary transport second reinforcing rod structure in a cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to the present invention. Detailed Implementation

[0017] The present application will be further described below with reference to the embodiments.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, in the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Different embodiments can be substituted or combined, and for those skilled in the art, other implementation methods can be obtained based on these embodiments without creative effort.

[0019] Combined with appendix Figure 1-12 The cascaded energy storage compartment 000 of this invention consists of 9 rows of 18 clusters of batteries. The rated output voltage of a single compartment is 12.4kV, which can meet the needs of power grids of different voltage levels such as 10kV, 24kV, and 35kV. See the two special voltage level electrical topologies in the figure.

[0020] The cascaded energy storage compartment 000 mainly consists of compartment 1, liquid cooling unit 2, liquid cooling pipeline 3, battery system 4, fire protection system 5, low-voltage cabinet 11, etc.; each part is a self-contained module, which is convenient for installation and maintenance.

[0021] The compartment 1 adopts a traditional container structure design, featuring high strength, convenient transportation, and lifting. The door assembly 9 is positioned opposite the side enclosure 14, with doors opening on only one side of the entire compartment along its length. This allows for "back-to-back" installation of the compartments, saving land. Two air conditioners 10 are installed on the door assembly 9, primarily for heat dissipation and dehumidification of the electrical components, mainly the PCS. The low-pressure compartment door assembly 15 is located on the low-pressure compartment side and mainly consists of the low-pressure compartment door 151, container door lock assembly 152, fire control window 153, energy storage compartment external display window 154, and fire alarm window 155. The fire control window mainly includes a manual fire extinguishing button, a manual fan start button, and a combustible gas concentration display. The energy storage compartment external display window includes a human-machine interface touchscreen, status indicator lights, and an emergency stop button. The fire alarm window mainly includes an audible and visual alarm and a gas release accident indicator light.

[0022] The aforementioned liquid-cooled unit 2 is located in one corner of the cabin. Unlike traditional low-pressure energy storage, the coolant here is low-conductivity deionized water or pure water. Also unlike traditional low-pressure energy storage, the liquid-cooled pipe 3 here is made of plastic. This is mainly to ensure the insulation distance between the power unit battery + PCS inside the cabin and the cabin under a 35kV voltage platform.

[0023] The battery system 4 consists of multiple rows of batteries, such as a first row of batteries 41, a second row of batteries 42, etc. The battery pack 22 is a long battery pack, allowing the cabin to be designed with the single-door configuration mentioned above. For a single row of batteries, such as the first row of batteries 41, it consists of an upper battery rack 411 and a lower battery rack 412. To ensure insulation at the corresponding voltage levels between adjacent cells in a single row, as mentioned above, there must be no metal connections between the upper and lower sections, while also meeting certain voltage level insulation distance requirements. To ensure the stability of the connection between the upper and lower battery racks, a first insulating plate 27 and a second insulating plate are designed for the upper and lower battery racks. 28; Upper and lower battery rack third isolation insulation plate 29; upper and lower battery rack connecting insulation plate 30; upper and lower battery rack connecting insulation sleeve 31; wherein the upper and lower battery rack first isolation insulation plate 27, upper and lower battery rack second isolation insulation plate 28 and upper and lower battery rack third isolation insulation plate 29 mainly serve the function of isolation and insulation, and the upper and lower battery rack third isolation insulation plate 29 also serves the function of upper and lower support; the upper and lower battery rack connecting insulation plate 30 serves the function of fixing and supporting, and the fixing between the upper and lower battery racks is achieved by screws; the upper and lower battery rack connecting insulation sleeve 31 mainly serves the function of insulation and support for the long screw 32; in this way, the upper and lower battery racks are fixed on all four sides. Between adjacent rows, such as the first row of batteries 41 and the second row of batteries 42, they are supported and connected by the inter-cluster first insulation connecting plate 25 and the inter-cluster second insulation connecting plate 26; wherein the inter-cluster second insulation connecting plate 26 is also designed with openings to connect to the inner wall of the cabin through the auxiliary transport first reinforcing rod 16, mainly to meet the stability of transport. To ensure the stability of the entire power unit during transport, a support connection is provided between the battery rack and the cabin, including a first auxiliary transport reinforcing rod 16, a second auxiliary transport reinforcing rod 17, and a third auxiliary transport reinforcing rod 18. The first auxiliary transport reinforcing rod 16 primarily ensures stability in the Y direction, the second auxiliary transport reinforcing rod 17 ensures stability in the X direction, and the third auxiliary transport reinforcing rod 18 ensures stable connection in both the X and Y directions. All three auxiliary transport reinforcing rods are made of high-strength steel. To ensure ease of installation, the second auxiliary transport reinforcing rod 17 is designed with auxiliary transport reinforcing rod a section 171, auxiliary transport reinforcing rod b section 172, and an adjustable mounting hole 173. The adjustable mounting hole 173 allows for adjustment of the length of the auxiliary transport reinforcing rod in the X direction, thus facilitating better installation and fastening of auxiliary transport reinforcing rod a section 171 and auxiliary transport reinforcing rod b section 172. In the battery system described above, all PCS are centrally installed, which can meet the requirements of the shortest connection path of the inter-cluster copper busbar 33 and the lowest cost.Similarly, to ensure the insulation and stability of the power unit, the bottom of the battery rack is fixedly connected to the battery cluster fixing bracket 24 through a 35kV battery rack insulation support column 6. The battery cluster fixing bracket 24 is designed with a series of holes, which are fixed to the bottom of the cabin by bolts. This achieves the fixation and isolation of the power unit from the cabin in the Z direction.

[0024] The fire protection system mentioned in this invention includes two parts: water-based fire protection (7) and gas-based fire protection. Water-based fire protection involves injecting liquid-cooled water from the fire protection interface outside the cabin for irrigation and spraying inside. Gas-based fire protection primarily uses heptafluoropropane or perfluorohexanone stored in the fire protection gas tank (51) to spray into the battery pack and cabin interior via the fire protection pipeline (52). This invention employs a cabin-level + PACK-level fire protection system. Furthermore, the cabin shell is equipped with two exhaust windows (8), one air inlet window (12), and one pressure relief window (13) to ensure ventilation and air exchange within the cabin, including the release of combustible gases and pressure within the fire protection compartment.

[0025] The low-voltage cabinet 11 mentioned in this invention mainly houses the switches, circuit breakers, relays, fuses, switching power supplies, etc. for low-voltage power distribution of electrical equipment in the cabin, as well as controllers for related equipment such as the Battery Management System (BAMS) main control unit, the local EMS control host, the communication management unit, etc., switches, UPS power supplies, etc.

[0026] The top of the cabin of this invention is also equipped with devices such as an access control switch 19, a lighting lamp 20, and an emergency light 21. The access control switch 19 and the lighting lamp are interconnected. For example, when the low-pressure compartment door assembly 15 is open or not fully closed, a pair of contacts on the access control switch 19 will close, activating the lighting lamp 20 and turning it on. Simultaneously, the corresponding contact information will be fed back to the local EMS control host. Similarly, when the low-pressure compartment door assembly 15 is closed, a pair of contacts on the access control switch 19 will open, activating the lighting lamp 20 and turning it off. The corresponding contact information will also be fed back to the local EMS control host. The emergency light 21 is mainly used for emergency lighting when the cabin's power distribution is interrupted.

[0027] The cascaded energy storage module mentioned in the invention has the characteristics of a standard and universal design, which can be used for electrical topology for different grid voltages without changing the overall structural design of the module, such as the two special voltage level applications listed above. The cascaded energy storage module mentioned in the invention adopts a modular integrated design; each part is a separate module, which is convenient for installation and maintenance, and has a high degree of integration, unlike the liquid cooling unit and power distribution unit mentioned above which are designed separately.

[0028] The cascaded energy storage module mentioned in the invention, with its upper and lower battery racks, centrally located PCS, and the aforementioned single-door design, can significantly reduce the inter-cluster connection path, resulting in a substantial cost advantage.

[0029] This cascaded energy storage system addresses current market issues such as circulating current, significant efficiency losses, large power plant footprint, system complexity, and slow response times in low-voltage energy storage. It employs a series-only design, eliminating circulating current risks. The cascaded topology allows for direct voltage boosting to 10 or 35kV without the need for a step-up transformer, reducing power plant footprint and power conversion losses. Internal fiber optic integration enhances communication interference resistance and improves energy storage response speed. To address the issue of poor product versatility, the market often presents two different products for 10kV and 35kV systems, requiring the development of different models to suit different customer voltage levels, leading to high costs and long development cycles. This invention addresses this problem by incorporating a compatible energy storage module design, allowing it to be used in both 10kV industrial and commercial applications and 35kV grid applications, differing only in system topology. To address issues such as complex on-site wiring, additional piping (liquid cooling pipes for liquid-cooled units), complex sites, and inconvenient maintenance, this invention's cascaded energy storage compartment adopts a modular integrated design with high integration. When the equipment is installed on-site, only connections between devices and between devices and the main equipment at the site are required. Each module is clearly defined, and inspection and maintenance are clearly defined. To address the safety concerns during the transportation of cascaded energy storage equipment, this invention includes a separate design for auxiliary support rods that need to be installed before transportation, in addition to the necessary insulating support connections, to ensure the safety of the transported equipment. To address the issues of complex, long, and costly inter-cluster wiring in cascaded energy storage modules, this invention arranges two battery clusters vertically in a single row within the energy storage module. The corresponding PCS are arranged adjacent to each other vertically, shortening the connection path between them. At the same time, the entire module adopts a long battery pack design with a single-side door, avoiding long wiring paths at the front and rear.

[0030] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cascaded energy storage compartment for a 35kV high-voltage direct-connection system, characterized in that, include: The cabin (1), liquid cooling unit (2), liquid cooling pipe (3), battery system (4), fire protection system (5) and low-voltage cabinet (11); the battery system (4) consists of multiple rows of batteries, with two clusters in a single row, arranged vertically, and the upper and lower clusters are isolated by a high-strength insulating plate. At the same time, an insulating sleeve is used to isolate the long screw, so as to achieve a rigid connection between the upper and lower clusters and insulation between the upper and lower clusters; the upper and lower clusters are placed in the middle of the PCS.

2. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The cabinet door assembly (9) of the cabin (1) is set opposite to the side enclosure panel (14), and the entire cabin opens on one side in the length direction of the cabin; two air conditioners (10) are installed on the cabinet door assembly (9); the low-pressure room door assembly (15) is located on the low-pressure room side.

3. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The cabinet door assembly (9) consists of a low-pressure chamber door (151); a container door lock assembly (152); a fire control window (153); an external display window for the energy storage compartment (154); and a fire alarm window (155). The fire control window includes a manual fire extinguishing button, a manual fan start button, a combustible gas concentration display, and other equipment. The external display window for the energy storage compartment includes a human-machine interface touch screen, status indicator lights, and an emergency stop button. The fire alarm window includes an audible and visual alarm and an indicator light for accidental gas release.

4. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The liquid cooling unit (2) is located in one corner of the cabin, and the coolant is low conductivity deionized water or pure water; the liquid cooling pipe (3) is made of plastic. The battery system (4) consists of multiple rows of batteries. The battery pack (22) is a long battery pack, so the cabin can be designed as a single-door type as mentioned above. Each row of batteries consists of a single upper battery rack (411) and a single lower battery rack (412). A first insulating plate (27) is provided between the upper battery rack (411) and the lower battery rack (412). A second insulating plate (28) is provided between the upper battery rack. A third insulating plate (29) is provided between the upper battery rack. An insulating plate (30) is provided between the upper battery rack. An insulating sleeve (31) is provided between the upper battery rack. Adjacent rows of batteries are supported and connected by a first insulating connecting plate (25) and a second insulating connecting plate (26) between clusters. An opening is also designed on the second insulating connecting plate (26) between clusters to connect with the inner wall of the cabin through an auxiliary transport first reinforcing rod (16).

5. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The battery rack and the cabin are connected by a support. The first auxiliary transport reinforcing rod (16) mainly ensures the stability of the connection in the Y direction, the second auxiliary transport reinforcing rod (17) ensures the stability of the connection in the X direction, and the third auxiliary transport reinforcing rod (18) ensures the stability of the connection in both the X and Y directions. The second reinforcing rod (17) is designed with auxiliary transport second reinforcing rod a section (171), auxiliary transport second reinforcing rod b section (172), and adjustable mounting hole (173). The adjustable mounting hole (173) can be adjusted in the X direction. The PCS of the battery system are all installed in the center. The bottom of the battery rack is fixedly connected to the battery cluster fixing bracket (24) through a 35kV battery rack insulating support column (6). The battery cluster fixing bracket (24) is designed with a series of holes and is fixed to the bottom of the cabin by bolts to realize the fixation and isolation of the power unit from the cabin in the Z direction.

6. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The fire protection system consists of two parts: water fire protection (7) and gas fire protection. Water fire protection involves injecting liquid-cooled water from the fire protection interface outside the cabin to irrigate and spray inside the cabin. Gas fire protection mainly involves spraying the battery pack and the cabin interior through the fire protection pipeline (52) using heptafluoropropane or perfluorohexanone stored in the fire protection gas tank (51). The cabin shell is also equipped with two exhaust windows (8), one air inlet window (12), and one pressure relief window (13) to ensure ventilation and air exchange inside the cabin and release pressure inside the fire protection cabin.

7. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The low-voltage cabinet (11) is equipped with switches for low-voltage power distribution of electrical equipment in the cabin, controllers for related equipment, switches, and UPS power supplies. The switches include circuit breakers, relays, fuses, and switching power supplies. The controllers for related equipment include the Battery Management System (BAMS) master controller, the local EMS control host, and the communication management unit.

8. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The top of the cabin is also equipped with access control switches (19), lighting (20), emergency lights and other equipment (21). The access control switches (19) and lighting (20) are linked. The emergency lights (21) are mainly used for emergency lighting when the cabin is without power.

9. The cascaded energy storage compartment for a 35kV high-voltage direct-connection system according to claim 1, characterized in that, The linkage function is as follows: when the low-pressure room door assembly (15) is in the open state or not closed, a pair of contacts of the access control switch (19) will close, and the lighting lamp (20) will be in the on state, and the lamp will be lit. At the same time, the corresponding contact information will be fed back to the local EMS control host. When the low-pressure room door assembly (15) is in the closed state, a pair of contacts of the access control switch (19) will open, and the lighting lamp (20) will be in the off state, and the lamp will be off. At the same time, the corresponding contact information will be fed back to the local EMS control host.

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