A light storage grid-connected integrated energy storage system

Abstract

The utility model relates to a kind of light storage grid integration energy storage system, relating to energy storage equipment technical field.The cabinet is transversely separated by partition to form power conversion area, control management area, energy storage battery area and auxiliary equipment area, the power conversion area is also separated into two areas by partition, and isolation transformer, grid-connected switch cabinet are arranged in the outermost area of power conversion area, and energy storage converter is arranged in the inside area of power conversion area, EMS management module, busbar cabinet are arranged side by side in control management area, lithium battery group is arranged in energy storage battery area, by adopting modularization plane layout design, power conversion area, control management area, energy storage battery area and auxiliary equipment area are scientifically zoned and integrated in standard 20 feet container, greatly improve space utilization and equipment installation density, and reduce transportation cost.

Description

Technical Field

[0001] This utility model relates to an integrated photovoltaic-storage grid-connected energy storage system, and belongs to the field of energy storage equipment technology. Background Technology

[0002] With the increasing penetration of renewable energy, the contradiction between the intermittency of photovoltaic power generation and the demand for grid stability is becoming increasingly prominent. Photovoltaic-storage grid-connected systems, by smoothing power fluctuations through energy storage units, have become a key technological path to solve this problem. In existing technologies, the integration of photovoltaic power generation, energy storage units, and the grid mainly adopts a distributed deployment model, where photovoltaic inverters, energy storage batteries, PCS converters, grid-connected cabinets, and EMS microgrid management systems are installed independently and connected at the site level via cables.

[0003] Existing distributed deployment models have wide spacing between devices, making thermal runaway less likely. However, due to the large overall footprint of distributed deployment models, deployment is more complicated and land costs are higher. In addition, the large size of each device makes transportation inconvenient. Temporary installation and commissioning are required when transporting the device to the site, which requires a high level of expertise from the operators. Therefore, an integrated photovoltaic-storage grid-connected energy storage system is proposed to solve the problems existing in the current technology. Utility Model Content

[0004] The purpose of this utility model is to address the defects or deficiencies in the existing technology by providing an integrated photovoltaic-storage grid-connected energy storage system. By adopting a modular planar layout design, the power conversion area, control and management area, energy storage battery area, and auxiliary equipment area are scientifically partitioned and integrated into a standard 20-foot container, which greatly improves space utilization and equipment installation density, and reduces transportation costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: It includes a housing 1, which is laterally divided by an isolation plate 14 to form a power conversion area a, a control and management area b, an energy storage battery area c, and an auxiliary equipment area d. The power conversion area a is further divided into two regions by the isolation plate 14. An isolation transformer 7 and a grid-connected switch cabinet 9 are installed in the outermost region of the power conversion area a, and an energy storage converter 6 is installed in the inner region of the power conversion area a. An EMS management module 4 and a combiner cabinet 3 are arranged in parallel in the control and management area b, and a lithium battery pack 2 is installed in the energy storage battery area c.

[0006] Furthermore, a liquid cooling unit 10 is provided in the auxiliary equipment area d. The liquid cooling unit 10 is connected to the lithium battery pack 2. The liquid cooling unit 10 includes a liquid cooling host and a liquid distributor, which are connected by pipelines.

[0007] Furthermore, a station service transformer 8 is also installed on one side of the grid-connected switchgear 9, and the two are directly connected by copper busbars in a back-to-back installation layout. The isolation transformer 7 and the energy storage converter 6 are also directly connected by copper busbars in a back-to-back installation layout. The station service transformer 8 is also electrically connected to the combiner cabinet 3.

[0008] Furthermore, the lithium battery pack 2 is electrically connected to the combiner cabinet 3 and the energy storage converter 6, the combiner cabinet 3 is electrically connected to the energy storage converter 6, the energy storage converter 6 is electrically connected to the isolation transformer 7, and the isolation transformer 7 is electrically connected to the grid-connected switch cabinet 9.

[0009] Furthermore, the energy storage converter 6 is also equipped with a photovoltaic input port.

[0010] Furthermore, the EMS management module 4 is connected to the lithium battery pack 2, combiner cabinet 3, energy storage converter 6, isolation transformer 7, station service transformer 8, and grid-connected switch cabinet 9 respectively, and the EMS management module 4 is equipped with a wireless transmission module that is wirelessly connected to the terminal control system.

[0011] Furthermore, the control and management area b is also equipped with a fire control cabinet 5 and an EMS management module 4 connected by hard wiring, and the fire control cabinet 5 is electrically connected to the combiner cabinet 3.

[0012] Furthermore, the energy storage battery area c adopts a layered drawer-type structure, and the lithium battery pack 2 adopts a multi-layer PACK structure and is set inside the drawer structure. At the same time, each layer of PACK is equipped with a liquid cooling plate at the bottom, which is connected to the liquid cooling pipeline through a quick connector and then connected to the liquid distributor.

[0013] Furthermore, the front side of the enclosure 1 is provided with multiple sealed doors 11 corresponding to the power conversion area a, control and management area b, energy storage battery area c, and auxiliary equipment area d.

[0014] Furthermore, the bottom of the box 1 is a raised moisture-proof layer 12.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are as follows: by adopting a modular planar layout design, the power conversion area, control and management area, energy storage battery area and auxiliary equipment area are scientifically partitioned and integrated into a standard 20-foot container, which greatly improves the space utilization and equipment installation density, and reduces transportation costs. Attached Figure Description

[0016] 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 these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a top view of the internal structure of this utility model;

[0019] Figure 3 yes Figure 2 The second angle view;

[0020] Figure 4 yes Figure 2 The third-angle view;

[0021] Figure 5 This is a schematic diagram of the assembly effect of the lithium battery pack 2 in this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Enclosure; 2. Lithium battery pack; 3. Combiner cabinet; 4. EMS management module; 5. Fire control cabinet; 6. Energy storage converter; 7. Isolation transformer; 8. Station service transformer; 9. Grid-connected switchgear; 10. Liquid-cooled unit; 11. Sealed door; 12. Elevated moisture-proof layer; 13. Power conversion area a; 14. Control and management area b; 15. Energy storage battery area c; and 16. Auxiliary equipment area d. Detailed Implementation

[0023] See Figures 1-5As shown, the technical solution adopted in this specific embodiment is as follows: It includes a housing 1, which is horizontally divided by an isolation plate 14 to form a power conversion area a, a control and management area b, an energy storage battery area c, and an auxiliary equipment area d. The power conversion area a is further divided into two regions by the isolation plate 14. An isolation transformer 7 and a grid-connected switchgear 9 are installed in the outermost region of the power conversion area a, and an energy storage converter 6 is installed in the inner region of the power conversion area a. An EMS management module 4 and a combiner cabinet 3 are installed side by side in the control and management area b. A lithium battery pack 2 is installed in the energy storage battery area c. A station service transformer 8 is also installed on one side of the grid-connected switchgear 9, and the two are directly connected by copper busbars in a back-to-back installation layout. The isolation transformer 7 and the energy storage converter 6 are also installed back-to-back. The installation layout is directly connected via copper busbars. The station transformer 8 is also electrically connected to the combiner cabinet 3. Traditional energy storage output systems usually require multiple sets of equipment to be arranged in a large area, which not only occupies a large area but is also inconvenient to transport. In addition, professional personnel are required to install and debug the equipment after it arrives on site. Therefore, in this embodiment, an integrated photovoltaic-storage grid-connected device is adopted. The enclosure is divided into several cavities by an isolation plate, and the lithium battery pack, combiner cabinet, EMS management module, fire control cabinet, energy storage converter, isolation transformer, station transformer, and grid-connected switch cabinet are set in the corresponding cavities according to their functions. At the same time, a back-to-back layout is adopted for the installation of the equipment with a spacing of ≤250mm, which can effectively improve the space utilization, reduce the cable length, and reduce the assembly difficulty.

[0024] More specifically, within the enclosure, the lithium battery pack 2 is electrically connected to the combiner cabinet 3 and the energy storage converter 6. The combiner cabinet 3 is electrically connected to the energy storage converter 6, the energy storage converter 6 is electrically connected to the isolation transformer 7, and the isolation transformer 7 is electrically connected to the grid-connected switchgear 9. The wiring connections match the equipment's planar layout. The overall operating state of the equipment is mainly divided into two categories: one is when the external power supply is normal, and the other is when the external power supply is abnormal. Understandably, there are also photovoltaic modules connected externally to power this integrated system. During operation, photovoltaic power is output to the energy storage converter, where it is split into two paths: one path goes to the lithium battery pack for charging, and the other path goes to the isolation transformer for voltage transformation and electrical isolation. The rectified power finally enters the grid-connected switchgear for external use. When the external power input is abnormal, it switches to the lithium battery pack power supply mode. At this time, the lithium battery pack outputs DC power to the combiner cabinet, which then outputs it to the energy storage converter for DC / AC conversion. The converted AC power is then sent to the isolation transformer for voltage transformation and electrical isolation. Finally, the rectified power enters the grid-connected switchgear for external use. Dual-mode switching ensures stable power output. In this embodiment, the station service transformer is a step-down device. Its input end is electrically connected to one AC output end of the energy storage converter, and its output end is electrically connected to the combiner cabinet. It can be understood that the combiner cabinet is not only a multi-input terminal aggregation output part, but also has a power distribution output end, which receives the power output from the station service transformer, thereby outputting stepped-down power to the auxiliary equipment. In summary, in this embodiment, the main circuit power path is isolation transformer → grid-connected switchgear → power grid, and the auxiliary circuit path is energy storage converter AC side → station service transformer → combiner cabinet power distribution part → auxiliary equipment.

[0025] In addition, in this embodiment, the bottom of the container 1 is a raised moisture-proof layer 12. Taking a 20-foot container as an example, the height of the raised moisture-proof layer is greater than or equal to 200mm. The internal cable channel can be integrated, and the equipment's wiring can be arranged in it, optimizing the wiring route. At the same time, the raised layer helps to prevent moisture, thus making it suitable for harsh environmental application scenarios such as offshore photovoltaic support and island microgrids.

[0026] More specifically, the auxiliary equipment area d is equipped with a liquid cooling unit 10, which is connected to the lithium battery pack 2. The liquid cooling unit 10 includes a liquid cooling host and a liquid distributor, which are connected by pipelines. In this embodiment, the energy storage battery area c adopts a layered drawer-type structure, with each layer equipped with a guide rail structure. The lithium battery pack 2 adopts a multi-layer PACK structure and is installed in the drawer structure, making it easier to move on the guide rails. Furthermore, the guide rails are equipped with a self-locking structure to lock the pack after it is installed, preventing movement. Additionally, each layer of P... The bottom of the ACK is equipped with a liquid cooling plate, which connects to the liquid cooling pipeline via quick connectors and then to the distributor. The pull-out drawer structure facilitates the disassembly of each PACK and the connection and installation of the liquid cooling pipeline, allowing the liquid cooling unit to control the temperature of the lithium battery pack. Understandably, the lithium battery pack is equipped with a temperature sensor that works in conjunction with the liquid cooling unit. The liquid cooling unit has a built-in flow control valve, which dynamically adjusts the flow rate based on the battery temperature feedback from the BMS: when T>30℃, the flow rate increases to 30L / min; when T<24℃, the heating cycle is activated, thereby achieving real-time temperature monitoring.

[0027] More specifically, the energy storage converter 6 is also equipped with a photovoltaic input port. This is a general structural feature that allows the device to output solar energy in areas with sufficient solar energy, thereby reducing energy consumption.

[0028] More specifically, the EMS management module 4 is connected to the lithium battery pack 2, combiner cabinet 3, energy storage converter 6, isolation transformer 7, station service transformer 8, and grid-connected switch cabinet 9, respectively. The EMS management module 4 also integrates a wireless transmission module that is wirelessly connected to the terminal control system. In this embodiment, the EMS management module monitors and manages each module, thereby enabling intelligent charging and discharging management. The monitoring data is also uploaded via the wireless transmission module so that the control center can monitor the operation of the equipment in real time.

[0029] More specifically, the control and management area b is also equipped with a fire control cabinet 5 and an EMS management module 4 connected by hard wiring, and the fire control cabinet 5 is electrically connected to the combiner cabinet 3. The fire control cabinet works in conjunction with the temperature control of the liquid cooling unit to quickly control the fire in the event of a thermal runaway. In addition, in this embodiment, the perfluorohexanone fire extinguishing agent used in the fire control cabinet is safer and more efficient.

[0030] More specifically, the front side of the enclosure 1 is provided with multiple sealed doors 11 corresponding to the power conversion area a, control and management area b, energy storage battery area c, and auxiliary equipment area d. The hinged sealed doors are opened and closed by latches, which facilitates equipment maintenance. In one embodiment, the sealed doors are provided with quick-release panels and manholes, which can be used for targeted and rapid maintenance of key equipment.

[0031] The working principle of this utility model is as follows: When the equipment is working, the lithium battery pack 2 outputs DC power to the combiner cabinet 3, which then outputs it to the energy storage converter 6 for DC / AC conversion. This is the working state when there is an abnormal external power input. When the external power input is normal, the photovoltaic module output to the energy storage converter 6 is split into two paths. One path is sent to the lithium battery pack 2 for charging, and the other path is converted to AC power by the energy storage converter 6. The converted AC power is then sent to the isolation transformer 7 for voltage transformation and electrical isolation. The adjusted power finally enters the grid-connected switch cabinet 9 for external use. During this process, the EMS management module 4 monitors the status of the lithium battery pack 2 and the energy storage converter throughout the entire process. The system coordinates the charging and discharging process based on the operating parameters and grid conditions of the device 6, and uploads the data via a wireless transmission module. When the external photovoltaic input is abnormal, it switches to the output state of the lithium battery pack 2 to ensure continuous normal output. Meanwhile, the liquid cooling unit 10 precisely controls the temperature of the lithium battery pack 2 based on temperature monitoring data throughout the process. If thermal runaway occurs in the lithium battery pack 2, the EMS management module 4 will feed back the monitoring data to the fire control cabinet 5, which will trigger the fire extinguishing system to extinguish the fire. All subsystems are connected by electrical connections and communication networks to form an organic whole, realizing the storage, conversion and grid-connected transmission of electrical energy, thereby improving space utilization and equipment installation density.

[0032] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A photovoltaic-storage grid-connected integrated energy storage system, comprising a housing (1), characterized in that: The enclosure (1) is horizontally divided by an isolation plate (14) to form a power conversion area (a), a control and management area (b), an energy storage battery area (c), and an auxiliary equipment area (d). The power conversion area (a) is further divided into two areas by the isolation plate (14). An isolation transformer (7) and a grid-connected switch cabinet (9) are installed in the outermost area of ​​the power conversion area (a). An energy storage converter (6) is installed in the inner area of ​​the power conversion area (a). An EMS management module (4) and a combiner cabinet (3) are installed in parallel in the control and management area (b). A lithium battery pack (2) is installed in the energy storage battery area (c).

2. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The auxiliary equipment area (d) is equipped with a liquid cooling unit (10), which is connected to the lithium battery pack (2). The liquid cooling unit (10) includes a liquid cooling host and a liquid distributor, which are connected by pipelines.

3. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The grid-connected switchgear (9) is also equipped with a station service transformer (8) on one side, and the two are directly connected by copper busbars in a back-to-back installation layout. The isolation transformer (7) and the energy storage converter (6) are also directly connected by copper busbars in a back-to-back installation layout. The station service transformer (8) is also electrically connected to the combiner cabinet (3).

4. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The lithium battery pack (2) is electrically connected to the combiner cabinet (3) and the energy storage converter (6). The combiner cabinet (3) is electrically connected to the energy storage converter (6). The energy storage converter (6) is electrically connected to the isolation transformer (7). The isolation transformer (7) is electrically connected to the grid-connected switch cabinet (9).

5. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The energy storage converter (6) is also equipped with a photovoltaic input port.

6. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The EMS management module (4) is connected to the lithium battery pack (2), combiner cabinet (3), energy storage converter (6), isolation transformer (7), station transformer (8), and grid-connected switch cabinet (9) respectively. The EMS management module (4) is also equipped with a wireless transmission module that is wirelessly connected to the terminal control system.

7. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The control management area (b) is also equipped with a fire control cabinet (5) and an EMS management module (4) connected by hard wiring, and the fire control cabinet (5) is electrically connected to the combiner cabinet (3).

8. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The energy storage battery area (c) adopts a layered drawer-type structure. The lithium battery pack (2) adopts a multi-layer PACK structure and is set inside the drawer structure. At the same time, each layer of PACK is equipped with a liquid cooling plate at the bottom, which is connected to the liquid cooling pipeline through a quick connector and then connected to the liquid distributor.

9. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The front side of the enclosure (1) is provided with multiple sealed doors (11) corresponding to the power conversion area (a), control and management area (b), energy storage battery area (c) and auxiliary equipment area (d).

10. The integrated photovoltaic-storage grid-connected energy storage system according to claim 1, characterized in that: The bottom of the box (1) is a raised moisture-proof layer (12).

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