An integrated energy storage cabinet and energy storage system

Abstract

This application discloses an integrated energy storage cabinet and energy storage system, including: a cabinet, a PCS module, a load-side molded case circuit breaker, a static transfer switch, and a grid-side molded case circuit breaker. The PCS module, the load-side molded case circuit breaker, and the static transfer switch are all located within the cabinet. The static transfer switch is connected to the PCS module via a first AC cable and to the load-side molded case circuit breaker via a second AC cable. The grid-side molded case circuit breaker is located within the cabinet and is electrically connected to the static transfer switch via a third AC cable. At least a portion of the AC cables are fitted with magnetic ring assemblies, which suppress common-mode noise between modules and improve EMI between modules and the system externally. This application utilizes magnetic rings strategically added at specific locations within the system, resulting in simple and easy installation, and effectively suppressing electromagnetic interference between devices within the integrated energy storage cabinet.

Description

Technical Field

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

[0002] As a system with a high density of power electronic equipment, integrated energy storage cabinets are prone to electromagnetic interference (EMI) from components such as power converters (PCS), DC / DC converters, and static switching switches (STS). Excessive EMI can lead to malfunctions in surrounding electronic equipment (such as medical and communication equipment), causing safety accidents. Existing EMI-related rectification measures mainly target individual modules, such as optimizing PCB layout to shorten high-frequency loop paths, avoiding parallel routing of switching nodes and sensitive lines, using Kelvin connections to reduce parasitic inductance in current sensing paths, or connecting RC circuits in parallel across contacts to suppress relay / thyristor interference. While these measures can ensure that a single module passes EMI testing, integrated energy storage cabinets, after integrating multiple modules, still experience EMI test failures. EMI modifications for the system often rely on past experience, lacking a clear and supportive solution. This results in a significant waste of testing time, manpower, and resources, and a substantial increase in modification costs.

[0003] In related technologies, EMI mitigation measures for single modules cannot meet system requirements. EMI mitigation for PCS, STS, and DC / DC modules often involves optimizing internal PCB layout, changing wiring methods, and adding RC circuits to internal component contacts. While these measures can improve the EMI performance of a single module, they cannot solve the system-wide EMI interference problem. Single-module EMI mitigation measures have limitations. Current EMI mitigation for PCS, STS, and DC / DC modules mainly relies on internal module optimization methods (such as PCB layout adjustments, improved wiring methods, and the addition of RC circuits to component contacts). Although these measures can locally improve the EMI performance of a single module, they cannot solve the complex interference problems caused by system-level coupling after multi-module integration. For example, systemic EMI problems such as common-mode noise conduction between modules, high-frequency magnetic field coupling, and ground loop interference are difficult to effectively suppress through single-point mitigation alone.

[0004] Furthermore, the integrated energy storage cabinet integrates multiple power electronic devices, and the EMI problems generated by the coupling of these devices cannot be completely suppressed by the protection measures of the modules themselves, resulting in low overall electromagnetic compatibility of the system. As a highly integrated power electronic system, the integrated energy storage cabinet's internal PCS, STS, DC / DC and other devices will generate complex electromagnetic interference superposition effects due to factors such as high-frequency switching operations, parasitic parameter coupling and non-ideal grounding when operating in coordination. Utility Model Content

[0005] To solve one of the above-mentioned technical problems, this utility model provides an integrated energy storage cabinet and an energy storage system.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, embodiments of this application provide an integrated energy storage cabinet, comprising:

[0008] Cabinet;

[0009] PCS module, wherein the PCS module is located in the cabinet;

[0010] A load-side molded case circuit breaker, wherein the load-side molded case circuit breaker is installed in the cabinet;

[0011] A static transfer switch is installed in the cabinet. The static transfer switch is connected to the PCS module via a first AC cable and to the load-side plastic-cased circuit breaker via a second AC cable.

[0012] A grid-side plastic-cased circuit breaker is installed in the cabinet and is electrically connected to the static transfer switch via a third AC cable.

[0013] At least some of the AC cables are fitted with magnetic ring assemblies.

[0014] Optionally, the integrated energy storage cabinet further includes a first magnetic ring assembly, which is located in the cabinet and is sleeved on the first AC cable.

[0015] Optionally, the integrated energy storage cabinet also includes a second magnetic ring assembly, which is located in the cabinet and is sleeved on the second AC cable.

[0016] Optionally, the integrated energy storage cabinet includes a third magnetic ring group, which is located in the cabinet and is sleeved on the third AC cable.

[0017] Optionally, the integrated energy storage cabinet may also include a first filter capacitor board;

[0018] The static switch has an AC input terminal, which is electrically connected to the third AC cable;

[0019] The first filter capacitor plate is electrically connected to the AC input terminal.

[0020] Optionally, the integrated energy storage cabinet includes a second filter capacitor board;

[0021] The static switch has an AC output terminal, which is electrically connected to the second AC cable.

[0022] The second filter capacitor plate is electrically connected to the AC output terminal.

[0023] Optionally, the integrated energy storage cabinet also includes a DC / DC module and a DC circuit breaker, both of which are installed in the cabinet.

[0024] The DC circuit breaker is used for electrical connection to the photovoltaic system;

[0025] The DC circuit breaker is electrically connected to the input terminal of the DC / DC module, the first output terminal of the DC / DC module is used to electrically connect to the battery cluster, and the second output terminal of the DC / DC module is electrically connected to the PCS module.

[0026] Optionally, the integrated energy storage cabinet may also include a DC filter;

[0027] The DC circuit breaker is electrically connected to the DC filter, and the DC filter is electrically connected to the DC / DC module.

[0028] Secondly, embodiments of this application provide an energy storage system, including:

[0029] The aforementioned integrated energy storage cabinet has a grid-side plastic-cased circuit breaker electrically connected to the power grid, and a load-side plastic-cased circuit breaker electrically connected to the load.

[0030] A battery cluster, which is electrically connected to the PCS module.

[0031] Optionally, the energy storage system also includes photovoltaics and a DC / DC module and a DC circuit breaker mounted on a cabinet, the DC circuit breaker being electrically connected to the photovoltaics;

[0032] The DC circuit breaker is electrically connected to the DC / DC module;

[0033] The output terminals of the DC / DC module are electrically connected to the battery cluster and the PCS module, respectively.

[0034] By adopting the above technical solution, this application has the following beneficial effects:

[0035] The energy storage integrated cabinet of this application has magnetic ring assemblies fitted on at least some of the AC cables. The magnetic ring assemblies can suppress common-mode noise between modules and improve EMI between modules and the system to the outside. This application uses magnetic rings to reasonably add themselves at specific locations in the system. The installation method is simple and easy to operate, and it can effectively suppress electromagnetic interference between devices in the energy storage integrated cabinet.

[0036] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0038] Figure 1 A rear view of the integrated energy storage cabinet provided in an embodiment of this application is shown;

[0039] Figure 2 This document shows a front view of the integrated energy storage cabinet provided in an embodiment of this application;

[0040] Figure 3 A partial structural schematic diagram of the integrated energy storage cabinet provided in an embodiment of this application is shown;

[0041] Figure 4 This paper shows a schematic diagram of an energy storage system provided in an embodiment of this application;

[0042] Figure 5 This document shows a schematic diagram of the structure of the filter capacitor board in the integrated energy storage cabinet provided in an embodiment of this application;

[0043] Figure 6 This diagram shows the circuit connection of the filter capacitor board and static switching switch in the energy storage integrated cabinet provided in this embodiment.

[0044] In the diagram: 1. PCS module; 2. Load-side molded case circuit breaker; 3. Static transfer switch; 31. AC input terminal; 32. AC output terminal; 4. First AC cable; 5. Second AC cable; 6. Third AC cable; 7. Power grid-side molded case circuit breaker; 8. First magnetic ring group; 9. Second magnetic ring group; 10. Third magnetic ring group; 11. First filter capacitor board; 111. X capacitor; 112. Y capacitor; 113. Circuit board; 12. Second filter capacitor board; 13. DC / DC module; 14. DC circuit breaker; 15. DC filter.

[0045] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0047] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] See Figures 1 to 6 As shown in the illustration, this application provides an integrated energy storage cabinet, including: a cabinet body, a PCS module 1, a load-side plastic-cased circuit breaker 2, a static transfer switch 3, and a grid-side plastic-cased circuit breaker 7. The PCS module 1 is located within the cabinet body, the load-side plastic-cased circuit breaker 2 is located within the cabinet body, the static transfer switch 3 is located within the cabinet body, the static transfer switch 3 is connected to the PCS module 1 via a first AC cable 4, the static transfer switch 3 is connected to the load-side plastic-cased circuit breaker 2 via a second AC cable 5, and the grid-side plastic-cased circuit breaker 7 is located within the cabinet body and is electrically connected to the static transfer switch 3 via a third AC cable 6. The grid-side plastic-cased circuit breaker 7 is connected to the power grid, and the static transfer switch 3 is connected to the PCS module 1 via the first AC cable 4 to charge the battery pack. The static transfer switch 3 is connected to the load-side plastic-cased circuit breaker 2 via the second AC cable 5 to supply power to the load.

[0050] In this embodiment, at least a portion of the AC cables in the integrated energy storage cabinet are fitted with magnetic ring assemblies. Each magnetic ring assembly includes at least two magnetic rings, arranged sequentially along the extension direction of the corresponding AC cable. It should be noted that the magnetic rings can be nanocrystalline magnetic rings. In this application, the magnetic ring assemblies on at least a portion of the AC cables suppress common-mode noise between modules and improve EMI between modules and the system externally. This application utilizes the reasonable addition of magnetic rings at specific locations within the system, resulting in a simple and easy-to-operate installation method, and effectively suppresses electromagnetic interference between devices within the integrated energy storage cabinet.

[0051] In some possible implementations, the integrated energy storage cabinet further includes a first magnetic ring assembly 8, located within the cabinet and sleeved on the first AC cable 4. The first magnetic ring assembly 8 may include two magnetic rings. The arrangement of the first magnetic ring assembly 8 can suppress common-mode noise between the PCS module 1 and the static switching switch 3.

[0052] In some possible implementations, the integrated energy storage cabinet further includes a second magnetic ring group 9, located within the cabinet and sleeved on the second AC cable 5. The second magnetic ring group 9 may consist of three magnetic rings, which can suppress common-mode noise between related modules. The integrated energy storage cabinet may further include a third magnetic ring group 10, located within the cabinet and sleeved on the third AC cable 6, which can suppress common-mode noise between the power grid and the PCS module.

[0053] In some possible implementations, the integrated energy storage cabinet further includes a first filter capacitor board 11, a static switch 3 having an AC input terminal 31 electrically connected to the third AC cable 6, and the first filter capacitor board 11 electrically connected to the AC input terminal 31. Alternatively, the integrated energy storage cabinet may include a second filter capacitor board 12, the static switch 3 having an AC output terminal 32 electrically connected to the second AC cable 5, and the second filter capacitor board 12 electrically connected to the AC output terminal 32.

[0054] In this embodiment of the application, by connecting a filter capacitor board to the AC terminals of the incoming and outgoing lines of the static switching switch 3 (STS), differential-mode interference and common-mode interference of the AC port can be suppressed, the load equipment can be protected from high-frequency noise of the power line, ground coupling interference can be prevented, and EMI radiation can be reduced.

[0055] Combination Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, the filter capacitor board may include a circuit board 113 and three X capacitors 111 and twelve Y capacitors 112 disposed on the circuit board 113. The X capacitors 111 are connected between phases A and N, B and N, and C and N. The Y capacitors 112 are connected in groups of three between phases A and ground, phase B and ground, phase C and ground, and phase N and ground. Furthermore, the filter capacitor board's external wiring is achieved through on-board connectors, providing four outgoing lines (A, B, C, and N). During electrical wiring, phases A, B, and C are connected to the corresponding phase sequence AC terminals of the static transfer switch 3 (STS) input and output lines, while phase N is connected to the N row of the system. The filter board has openings at its four corners, and all four screw holes are grounded. Metal male and female studs are used to mount the filter board to the system's metal bracket, achieving structural installation and electrical connection between the filter board and the system ground. The filter capacitor board is highly integrated, with four output terminals (A, B, C, and N) on each side. Holes at the four corners facilitate electrical and structural assembly and effectively suppress differential-mode and common-mode interference at the AC ports. Importantly, the filter capacitor board used in this application can be a commercially available product.

[0056] In some possible implementations, the integrated energy storage cabinet also includes a DC / DC module 13 and a DC circuit breaker 14. Both the DC / DC module 13 and the DC circuit breaker 14 are housed within the cabinet. The DC circuit breaker 14 is used to electrically connect to the photovoltaic system and is electrically connected to the input terminal of the DC / DC module 13. The first output terminal of the DC / DC module 13 is used to electrically connect to the battery cluster, and the second output terminal of the DC / DC module 13 is electrically connected to the PCS module 1. The photovoltaic power can be boosted by the DC / DC module 13 to charge the battery cluster. Alternatively, the photovoltaic power can be converted into AC power by the PCS module 1 to supply power to the load or flow to the power grid.

[0057] In some possible implementations, the integrated energy storage cabinet may also include a DC filter 15, a DC circuit breaker 14 electrically connected to the DC filter 15, and the DC filter 15 electrically connected to the DC / DC module 13.

[0058] The energy storage integrated cabinet of this application may also include two DC / DC modules 13, and DC filters 15 may be connected in series at the front end of the input side of the two DC / DC modules 13 respectively. The input side of the DC filter 15 is connected to the DC circuit breaker 14, and the output side is connected to the input side of the DC / DC module 13. The grounding position can be connected to the cabinet by a cable and fixed to the cabinet by multiple screws.

[0059] This application also provides an energy storage system, including: the aforementioned integrated energy storage cabinet, wherein the grid-side plastic-cased circuit breaker 7 of the integrated energy storage cabinet is electrically connected to the power grid, and the load-side plastic-cased circuit breaker 2 of the integrated energy storage cabinet is electrically connected to the load. A battery cluster is electrically connected to the PCS module 1. The energy storage system also includes a photovoltaic system and a DC / DC module 13 and a DC circuit breaker 14 mounted on the cabinet. The DC circuit breaker 14 is electrically connected to the photovoltaic system and the DC / DC module 13. The output terminals of the DC / DC module 13 are electrically connected to the battery cluster and the PCS module 1, respectively.

[0060] The energy storage system can operate in multiple modes. In the first mode, the photovoltaic input is directly connected to the DC / DC module 13, which boosts the voltage to charge the battery clusters. In the second mode, the photovoltaic system connects to the DC / DC module 13, which in turn connects to the PCS module 1. The PCS module 1 converts DC to AC to power the load. In the third mode, the photovoltaic system connects to the DC / DC module 13, which in turn connects to the PCS module 1. The PCS module 1 is then connected to a static transfer switch (STS), which is connected to the power grid to supply power. In the fourth mode, the battery clusters convert DC to AC via the PCS module 1 to power the load. In the fifth mode, the battery clusters convert DC to AC via the PCS module 1, which then connects to the static transfer switch (STS), which is connected to the power grid to supply power. In the sixth mode, power from the grid is supplied to the load via the static transfer switch (STS). In the seventh operating mode, the electricity from the grid is converted into DC power by the static switching switch 3 (STS) and then by the PCS module 1 to charge the battery cluster.

[0061] It should be noted that the integrated energy storage cabinet of this application can operate in a single mode or in multiple modes simultaneously. The following are examples of several modes operating at the same time:

[0062] Example 1: The first and second working modes described above are performed simultaneously. In this case, the electricity generated by the photovoltaic system charges the battery clusters while simultaneously discharging the load, as detailed below:

[0063] The photovoltaic input power is directly connected to the DC / DC module 13, which boosts the voltage to charge the battery cluster. Simultaneously, the DC / DC module 13 is connected to the PCS module 1, which in turn is connected to the load to supply power to it.

[0064] Example 2: The second and third working modes described above are performed simultaneously. In this case, the electricity generated by the photovoltaic system supplies power to the load while simultaneously discharging to the grid, as detailed below:

[0065] The photovoltaic system is connected to a DC / DC module 13, which in turn connects to a PCS module 1. The PCS module 1 converts the DC power to AC power to supply power to the load. Simultaneously, the PCS module 1 is connected to a static transfer switch 3 (STS), which in turn connects to the power grid to supply power to the grid.

[0066] Example 3: The second and fourth modes described above are performed simultaneously. In this case, both the photovoltaic system and the battery cluster supply power to the load at the same time, as detailed below:

[0067] The photovoltaic system is connected to DC / DC module 13, which in turn connects to PCS module 1. PCS module 1 converts DC to AC to supply power to the load. Simultaneously, the battery clusters also convert DC to AC through PCS module 1 to supply power to the load.

[0068] Example 4: The first and seventh operating modes described above are performed simultaneously. In this case, the electricity generated by the photovoltaic system and the electricity from the grid simultaneously charge the battery cluster, as detailed below:

[0069] The photovoltaic input power is directly connected to the DC / DC module 13, which boosts the voltage to charge the battery clusters. At the same time, the grid power passes through the static switching switch 3 (STS) and is then converted into DC power by the PCS module 1 to charge the battery clusters.

[0070] Example 5: The fourth and fifth modes described above are performed simultaneously. In this case, the battery pack supplies power to both the load and the power grid at the same time, as detailed below:

[0071] After the battery cluster converts DC to AC through PCS module 1, it supplies power to the load. PCS module 1 is then connected to static transfer switch 3 (STS), which is then connected to the power grid, so that the load and the power grid can be supplied simultaneously.

[0072] Example 6: The sixth and seventh modes described above are performed simultaneously. In this case, the power grid supplies power to both the load and the battery pack at the same time, as detailed below:

[0073] The electricity from the grid is supplied to the load after passing through the static transfer switch 3 (STS). At the same time, it is converted into DC power by the PCS module 1 to charge the battery pack.

[0074] Example 7: The first, sixth, and seventh modes described above are performed simultaneously. In this case, the photovoltaic system supplies power to the battery clusters, while the grid supplies power to both the battery clusters and the loads, as detailed below:

[0075] The photovoltaic input power is directly connected to the DC / DC module 13. After being boosted by the DC / DC module 13, it can charge the battery cluster. At the same time, the power from the grid is supplied to the load after passing through the static transfer switch 3 (STS). The grid power is then converted into DC power by the PCS module 1 and used to charge the battery cluster.

[0076] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An integrated energy storage cabinet, characterized in that, include: Cabinet; PCS module, wherein the PCS module is located in the cabinet; A load-side molded case circuit breaker, wherein the load-side molded case circuit breaker is installed in the cabinet; A static transfer switch is installed in the cabinet. The static transfer switch is connected to the PCS module via a first AC cable and to the load-side plastic-cased circuit breaker via a second AC cable. A grid-side plastic-cased circuit breaker is installed in the cabinet and is electrically connected to the static transfer switch via a third AC cable. At least some of the AC cables are fitted with magnetic ring assemblies.

2. The integrated energy storage cabinet of claim 1, wherein, It includes a first magnetic ring assembly, which is located in the cabinet and is sleeved on the first AC cable.

3. The integrated energy storage cabinet of claim 1, wherein, It includes a second magnetic ring assembly, which is located in the cabinet and is sleeved on the second AC cable.

4. The integrated energy storage cabinet of claim 1, wherein, It includes a third magnetic ring assembly, which is located in the cabinet and is sleeved on the third AC cable.

5. The integrated energy storage cabinet of claim 1, wherein, Including the first filter capacitor plate; The static switch has an AC input terminal, which is electrically connected to the third AC cable; The first filter capacitor plate is electrically connected to the AC input terminal.

6. The integrated energy storage cabinet of claim 1, wherein, Including the second filter capacitor plate; The static switch has an AC output terminal, which is electrically connected to the second AC cable. The second filter capacitor plate is electrically connected to the AC output terminal.

7. The integrated energy storage cabinet of claim 1, wherein, It also includes a DC / DC module and a DC circuit breaker, both of which are installed in the cabinet; The DC circuit breaker is used for electrical connection to the photovoltaic system; The DC circuit breaker is electrically connected to the input terminal of the DC / DC module, the first output terminal of the DC / DC module is used to electrically connect to the battery cluster, and the second output terminal of the DC / DC module is electrically connected to the PCS module.

8. The integrated energy storage cabinet of claim 7, wherein, It also includes DC filters; The DC circuit breaker is electrically connected to the DC filter, and the DC filter is electrically connected to the DC / DC module.

9. An energy storage system, characterized in that, include: As described in any one of claims 1-8, the grid-side plastic-cased circuit breaker of the integrated energy storage cabinet is electrically connected to the power grid, and the load-side plastic-cased circuit breaker of the integrated energy storage cabinet is electrically connected to the load. A battery cluster, which is electrically connected to the PCS module.

10. The energy storage system of claim 9, wherein, It also includes photovoltaics and a DC / DC module and a DC circuit breaker mounted on the cabinet, the DC circuit breaker being electrically connected to the photovoltaics; The DC circuit breaker is electrically connected to the DC / DC module; The output terminals of the DC / DC module are electrically connected to the battery cluster and the PCS module, respectively.

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