Grid-side converter of flywheel energy storage system

Abstract

The utility model discloses a grid-side converter of a flywheel energy storage system, which comprises a control cabinet and a power cabinet which are detachably connected, the control cabinet comprises a first cabinet body and a control circuit unit, and the first cabinet body is provided with a first front cabinet door and a first rear cabinet door; the power cabinet comprises a second cabinet body, the interior of the second cabinet body is divided into a first cavity and a second cavity, an LCL filter circuit unit is installed in the first cavity, a converter circuit unit is installed in the second cavity, a second front cabinet door and a second rear cabinet door are installed on the second cabinet body, and a third front cabinet door and a third rear cabinet door are installed on the second cabinet body; the first front cabinet door, the first rear cabinet door, the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door are all provided with ventilation meshes. Hoisting beams are mounted at the tops of the first cabinet body and the second cabinet body, and supporting bases are mounted at the bottoms of the first cabinet body and the second cabinet body; a split type structure is adopted, the arrangement of devices in the control cabinet and the power cabinet is optimized, the size is controlled, and transportation and carrying are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of flywheel energy storage systems, in particular to a grid-side converter of a flywheel energy storage system. Background Art

[0002] Flywheel energy storage systems are a highly efficient and reliable energy storage and release technology. They use a converter (also known as a bidirectional converter) to rapidly convert electrical energy into mechanical energy. They typically consist of a grid-side converter connected to the power grid and a generator-side converter connected to the flywheel energy storage device. The grid-side converter, which includes an integrated control and conversion unit, is relatively large, making it difficult to transport and carry. Utility Model Content

[0003] The purpose of the utility model is to provide a grid-side converter for a flywheel energy storage system, which solves the problem of adopting a split structure and optimizing the arrangement of components in a control cabinet and a power cabinet to control the volume and facilitate transportation and handling.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A grid-side converter of a flywheel energy storage system includes a detachably connected control cabinet and a power cabinet, the control cabinet including a first cabinet body and a control circuit unit installed in the first cabinet body, the first cabinet body being provided with a first front cabinet door and a first rear cabinet door; the power cabinet including a second cabinet body, the interior of the second cabinet body being divided into a first cavity and a second cavity, an LCL filter circuit unit being installed in the first cavity, and a converter circuit unit being installed in the second cavity; the second cabinet body being provided with a second front cabinet door and a second rear cabinet door located at the front and rear sides of the first cavity, and a third front cabinet door and a third rear cabinet door located at the front and rear sides of the second cavity and opening opposite each other; the first front cabinet door, the first rear cabinet door, the second front cabinet door, the second rear cabinet door, the third front cabinet door, and the third rear cabinet door are all provided with ventilation meshes; the tops of the first cabinet body and the second cabinet body are both provided with hanging beams, and the bottoms of the first cabinet body and the second cabinet body are both provided with support bases.

[0006] Preferably, the control circuit unit includes a revolving door panel rotatably installed in the first cabinet, a first switch controller is installed on the revolving door panel, and the first cabinet is provided with a pre-charging unit, a filter magnetic ring, an incoming line circuit breaker, a current transformer, a safety capacitor assembly and an incoming line copper busbar located on the rear side of the revolving door panel and arranged from top to bottom.

[0007] Preferably, two first protective plates covering internal components and arranged longitudinally are installed on the front side of the first cabinet.

[0008] Preferably, the LCL filter circuit unit includes a third cabinet installed in the second cavity, a power resistor, a filter capacitor located on one side of the power resistor, and a reactor located below and above the power resistor are installed in the third cabinet, an in-cabinet heat dissipation unit is installed on the top of the third cabinet, and a circuit breaker is installed on the front panel of the third cabinet; a second switch controller located above the in-cabinet heat dissipation unit is installed in the second cavity.

[0009] Preferably, a second protective plate located above the third cabinet and a third protective plate located below the third cabinet are installed on the front side of the second cavity.

[0010] Preferably, the current conversion circuit unit includes a plurality of power units installed in parallel in the second cavity, a unit controller is installed on the front side of the power unit, a fuse, a current sensor and a busbar located above the power unit are installed in the second cavity, and an input copper busbar, a heater and a current sensor are installed below the power unit in the second cavity.

[0011] Preferably, a fourth protective plate located above the power unit and a fifth protective plate located below the power unit are installed on the front side of the second cavity.

[0012] Preferably, a first heat dissipation unit communicating with the first cavity and a second heat dissipation unit communicating with the second cavity are installed on the top of the second cabinet.

[0013] Preferably, a door lock is provided between the first cabinet body and the first front cabinet door and the first rear cabinet door, and a door lock is provided between the second cabinet body and the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door.

[0014] Preferably, the first front cabinet door, the first rear cabinet door, the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door are all installed with a filter assembly located on one side of the air inlet mesh, and the filter assembly includes dust-proof cotton, steel mesh and dust-proof cover plate installed in sequence.

[0015] Beneficial effects:

[0016] By dividing the entire grid-side variable fluid into a control cabinet and a power cabinet, and installing a lifting beam on the top to realize lifting load, and a supporting base at the bottom to realize forklift lifting, it is convenient to reduce the occupied space during handling and transportation;

[0017] The control cabinet integrates the internal control circuit unit through the first cabinet body, and provides a first front cabinet door and a first rear cabinet door on the front and rear sides respectively for front and rear assembly operations of the internal components; at the same time, the power cabinet is divided into a first cavity and a second cavity through the second cabinet body to isolate and assemble the filter circuit unit and the converter circuit unit respectively, and provides a second front cabinet door and a second rear cabinet door respectively to realize the front and rear assembly operations of the filter circuit unit, and provides a third front cabinet door and a third rear cabinet door to realize the front and rear assembly operations of the converter circuit unit, thereby enabling the internal components to be staggered as much as possible to reduce the internal volume and effectively control the overall volume;

[0018] At the same time, the internal heat dissipation air flows in through the ventilation mesh to achieve heat dissipation and cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view structural diagram of an embodiment of the utility model;

[0020] Figure 2 This is a rear structural diagram of an embodiment of the present utility model;

[0021] Figure 3 This is a front view structural diagram of an embodiment of the utility model with the front cabinet door removed;

[0022] Figure 4 This is a rear view structural diagram of an embodiment of the utility model with the rear cabinet door removed;

[0023] Figure 5 for Figure 3 Schematic diagram of the structure without the protective plate;

[0024] Figure 6 for Figure 5 Structural diagram without the third cabinet;

[0025] Figure 7 This is a schematic structural diagram of the filter assembly in an embodiment of the present utility model;

[0026] exist Figures 1 to 7 In the figure, the corresponding relationship between the component names or lines and the figure numbers is as follows:

[0027] Control cabinet 1, first cabinet 11, control circuit unit 12, revolving door panel 121, first switch controller 122, pre-charge unit 123, filter magnetic ring 124, incoming circuit breaker 125, current transformer 126, safety capacitor assembly 127, incoming copper bus 128, first protective plate 129, first front cabinet door 13, first rear cabinet door 14, power cabinet 2, second cabinet 21, first cavity 22, second cavity 23, LCL filter circuit unit 24, third cabinet 241, power resistor 242, filter capacitor 243, reactor 244, cabinet heat dissipation unit 245, circuit breaker 246, second switch Controller 247, second protective plate 248, third protective plate 249, converter circuit unit 25, power unit 251, unit controller 252, fuse 253, current sensor 254, bus 255, input copper bus 256, heater 257, current sensor 258, fourth protective plate 259, fifth protective plate 2510, second front cabinet door 26, second rear cabinet door 27, third front cabinet door 28, third rear cabinet door 29, ventilation mesh 3, lifting beam 4, support base 5, first heat dissipation unit 6, second heat dissipation unit 7, filter assembly 8, dust-proof cotton 81, wire mesh 82, dust-proof cover 83. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] See also Figure 1-Figure 7 As shown, in the embodiment of the present invention, a grid-side converter of a flywheel energy storage system is proposed. By means of split design and optimization of the internal device layout structure, the overall volume is effectively reduced, which is convenient for handling and transportation. Specifically, it comprises a detachably connected control cabinet 1 and a power cabinet 2. The control cabinet 1 comprises a first cabinet body 11 and a control circuit unit 12 installed in the first cabinet body 11. The first cabinet body 11 is provided with a first front cabinet door 13 and a first rear cabinet door 14. The control circuit unit 12 is integrated and installed through the first cabinet body 11. At the same time, the first front cabinet door 13 and the first rear cabinet door 14 are provided on the front and rear sides so that the control circuit unit 12 can be assembled on the front and rear sides, thereby realizing parallel assembly and optimizing the internal assembly layout.

[0030] The power cabinet 2 includes a second cabinet 21, the interior of the second cabinet 21 is divided into a first cavity 22 and a second cavity 23, an LCL filter circuit unit 24 is installed in the first cavity 22, and a converter circuit unit 25 is installed in the second cavity 23. The second cabinet 21 is provided with a second front cabinet door 26 and a second rear cabinet door 27 located at the front and rear sides of the first cavity 22, and a third front cabinet door 28 and a third rear cabinet door 27 located at the front and rear sides of the second cavity 23 and opening opposite each other. 9. The LCL filter circuit unit 24 and the converter circuit unit 25 are separated and assembled through the first cavity 22 and the second cavity 23. The LCL filter circuit unit 24 can be assembled on the front and rear sides of the second cabinet 21 through the second front cabinet door 26 and the second rear cabinet door 27. The converter circuit unit 25 can be assembled on the front and rear sides of the second cabinet 21 through the third front cabinet door 28 and the third rear cabinet door 29. In this way, the internal components can be assembled in parallel in the front and rear, effectively controlling the volume occupied by the internal assembly and reducing the overall size.

[0031] In order to ensure the heat dissipation of internal components, ventilation meshes 3 are provided on the first front cabinet door 13, the first rear cabinet door 14, the second front cabinet door 26, the second rear cabinet door 27, the third front cabinet door 28 and the third rear cabinet door 29, so that external heat dissipation air can flow in through the ventilation meshes 3 to dissipate the heat generated by the operation of the internal components.

[0032] In order to facilitate independent lifting or hoisting, lifting beams are installed on the top of the first cabinet 11 and the second cabinet 21, and support bases 5 are installed on the bottom of the first cabinet 11 and the second cabinet 21. The lifting beams 4 are used for lifting, and the support bases 5 can be adapted for lifting by a forklift.

[0033] Specifically, the control circuit unit 12 includes a revolving door panel 121 rotatably installed in the first cabinet 11, and a first switch controller 122 is installed on the revolving door panel 121. The first cabinet 11 is provided with a pre-charging unit 123, a filter magnetic ring 124, an incoming line circuit breaker 125, a current transformer 126, a safety capacitor assembly 127 and an incoming line copper bus 128 located on the rear side of the revolving door panel 121 and arranged from top to bottom. The revolving door panel 121 facilitates the rotation of the first switch controller 122 and the installation of other components. The specific internal circuit connection principle can adopt the existing technology, and is mainly arranged in the first cabinet 11 to form a compact layout that meets heat dissipation requirements.

[0034] At the same time, two first protective plates 129 are installed on the front side of the first cabinet body 11 to cover the internal components and are arranged longitudinally. The first protective plates 129 isolate the state of opening the first front cabinet door 13 to avoid the risk of electric shock.

[0035] Specifically, the LCL filter circuit unit 24 includes a third cabinet 241 installed in the second cavity 23, and a power resistor 242 is installed in the third cabinet 241, a filter capacitor 243 located on one side of the power resistor 242, and a reactor 244 located below and above the power resistor 242, wherein the reactor located below is a large reactor and the reactor located above is a small reactor. An in-cabinet heat dissipation unit 245 is installed on the top of the third cabinet 241, a circuit breaker 246 is installed on the front panel of the third cabinet 241, and a second switch controller 247 located above the in-cabinet heat dissipation unit 245 is installed in the second cavity 23; similarly, the internal components are arranged and installed in the second cavity 23 to control the occupied volume.

[0036] At the same time, a second protective plate 248 located above the third cabinet 241 and a third protective plate 249 located below the third cabinet 241 are installed on the front side of the second cavity 23. The second protective plate 248 and the third protective plate 249 are used to isolate the parts that may be contacted after the cabinet door is opened.

[0037] Specifically, the current conversion circuit unit 25 includes a plurality of power units 251 installed in parallel in the second cavity 23, a unit controller 252 is installed on the front side of the power unit 251, a fuse 253, a first current sensor 254 and a bus 255 located above the power unit 251 are installed in the second cavity 23, and an input copper bus 256, a heater 257 and a second current sensor 258 are installed below the power unit 251 in the second cavity 23. The internal components are also reasonably arranged to minimize the internal space occupancy and reduce the overall volume.

[0038] At the same time, a fourth protective plate 259 located above the power unit 251 and a fifth protective plate 2510 located below the power unit 251 are installed on the front side of the second cavity 23. When the cabinet door is opened, isolation is achieved by the fourth protective plate 259 and the fifth protective plate 2510 to improve safety.

[0039] When combining cabinets, flexible copper busbars, current sensors, and other components are used for connection. Lightning protection and temperature and humidity control components are installed in the first cavity, and a grounding bar is integrated at the bottom of each cavity. Furthermore, a high-voltage sampling component is located in the second cavity, above the cabinet's heat dissipation unit. Specifically, this embodiment does not limit the type and number of circuit components; the primary consideration is the layout of the main components to facilitate heat dissipation and volume control.

[0040] The specific components, circuit connection methods, and circuit principles that constitute the control circuit unit 12, the LCL filter circuit unit 24, and the current conversion circuit unit 25 are all existing technologies. This embodiment mainly describes and explains the specific layout of the components to improve the internal space utilization and reduce the occupied volume.

[0041] In order to improve the internal heat dissipation effect, a first heat dissipation unit 6 connected to the first cavity 22 and a second heat dissipation unit 7 connected to the second cavity 23 are installed on the top of the second cabinet 21. The first heat dissipation unit 6 and the second heat dissipation unit 7 are mainly composed of fans and isolation nets. By discharging the internal hot air to the outside, the flow rate of the internal cold air is accelerated, thereby improving the heat dissipation effect.

[0042] To facilitate locking, a door lock is provided between the first cabinet body 11 and the first front cabinet door 13, the first rear cabinet door 14, and a door lock is provided between the second cabinet body 21 and the second front cabinet door 26, the second rear cabinet door 27, the third front cabinet door 28, and the third rear cabinet door 29.

[0043] At the same time, a filter assembly 8 located on one side of the air inlet mesh is installed on the first front cabinet door 13, the first rear cabinet door 14, the second front cabinet door 26, the second rear cabinet door 27, the third front cabinet door 28 and the third rear cabinet door 29. The filter assembly 8 includes dust-proof cotton 81, a wire mesh 82, and a dust-proof cover 83 installed in sequence to filter the incoming air to prevent dust from entering and causing contamination of internal components.

[0044] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and description, and should not be construed as indicating or implying relative importance.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A grid-side converter for a flywheel energy storage system, characterized in that: It comprises a detachably connected control cabinet and a power cabinet, wherein the control cabinet comprises a first cabinet body and a control circuit unit installed in the first cabinet body, and the first cabinet body is provided with a first front cabinet door and a first rear cabinet door; The power cabinet includes a second cabinet body, the interior of the second cabinet body is divided into a first cavity and a second cavity, an LCL filter circuit unit is installed in the first cavity, a converter circuit unit is installed in the second cavity, a second front cabinet door and a second rear cabinet door are installed on the second cabinet body, which are located on the front and rear sides of the first cavity, and a third front cabinet door and a third rear cabinet door are installed on the second cabinet body, which are located on the front and rear sides of the second cavity and open opposite each other; The first front cabinet door, the first rear cabinet door, the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door are all provided with ventilation mesh holes; The tops of the first cabinet and the second cabinet are both installed with hanging beams, and the bottoms of the first cabinet and the second cabinet are both installed with supporting bases.

2. The grid-side converter of a flywheel energy storage system according to claim 1, characterized in that: The control circuit unit includes a revolving door panel rotatably installed in the first cabinet, a first switch controller is installed on the revolving door panel, and the first cabinet is provided with a pre-charging unit, a filter magnetic ring, an incoming line circuit breaker, a current transformer, a safety capacitor assembly and an incoming line copper busbar located on the rear side of the revolving door panel and arranged from top to bottom.

3. The grid-side converter of a flywheel energy storage system according to claim 2, characterized in that: Two first protective plates are mounted on the front side of the first cabinet to cover internal components and are arranged longitudinally.

4. The grid-side converter of a flywheel energy storage system according to claim 1, characterized in that: The LCL filter circuit unit includes a third cabinet installed in the second cavity, a power resistor, a filter capacitor located on one side of the power resistor, and a reactor located below and above the power resistor are installed in the third cabinet, an in-cabinet heat dissipation unit is installed on the top of the third cabinet, and a circuit breaker is installed on the front panel of the third cabinet; A second switch controller located above the heat dissipation unit in the cabinet is installed in the second cavity.

5. The grid-side converter of a flywheel energy storage system according to claim 4, characterized in that: A second protective plate located above the third cabinet and a third protective plate located below the third cabinet are installed on the front side of the second cavity.

6. The grid-side converter of a flywheel energy storage system according to claim 1, characterized in that: The current conversion circuit unit includes multiple power units installed in parallel in the second cavity, a unit controller is installed on the front side of the power unit, a fuse, a current sensor and a busbar located above the power unit are installed in the second cavity, and an input copper busbar, a heater and a current sensor are installed below the power unit in the second cavity.

7. The grid-side converter of a flywheel energy storage system according to claim 6, characterized in that: A fourth protective plate located above the power unit and a fifth protective plate located below the power unit are installed on the front side of the second cavity.

8. A grid-side converter for a flywheel energy storage system according to any one of claims 1 to 7, characterized in that: A first heat dissipation unit communicating with the first cavity and a second heat dissipation unit communicating with the second cavity are installed on the top of the second cabinet.

9. The grid-side converter of a flywheel energy storage system according to claim 8, characterized in that: Door locks are provided between the first cabinet body and the first front cabinet door and the first rear cabinet door, and door locks are provided between the second cabinet body and the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door.

10. The grid-side converter of a flywheel energy storage system according to claim 9, characterized in that: The first front cabinet door, the first rear cabinet door, the second front cabinet door, the second rear cabinet door, the third front cabinet door and the third rear cabinet door are all equipped with a filter assembly located on one side of the air inlet mesh, and the filter assembly includes dust-proof cotton, steel wire mesh and dust-proof cover installed in sequence.

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