Flexible grid-connected and off-grid switching device for micro-grid

Abstract

The invention relates to the technical field of grid-connected and off-grid switching devices, in particular to a flexible grid-connected and off-grid switching device for a micro-grid, a sliding part is arranged above a supporting part in a sliding mode, the sliding part comprises an arc-shaped block, the arc-shaped block is communicated with the micro-grid, and when the arc-shaped block is attached to the surface of an electromagnet, the arc-shaped block is connected with the micro-grid. A circuit of the micro-grid is communicated with a circuit of the main power grid; when the conducting rods leave the conducting blocks, at the moment, the front ends of the isolation top plates are still located in the conducting upper grooves, the front ends of the isolation outer vertical plates are still located in the corresponding conducting outer vertical grooves, the front ends of the isolation bottom plates are still located in the conducting lower grooves, and the front ends of the isolation inner vertical plates are still located in the corresponding conducting inner vertical grooves, so that the adjacent conducting rods are separated; the conductive rods and the corresponding conductive blocks are located in a closed space, and the situation that the conductive rods and the conductive blocks cannot be separated in time due to arc and mutual interference generated at the moment when the conductive rods and the conductive blocks are separated, and disconnection of a micro-grid circuit is affected is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected and off-grid switching devices, and in particular to a flexible grid-connected and off-grid switching device for a microgrid. Background Technique

[0002] A microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, and monitoring and protection devices. It can operate either grid-connected with the external power grid or independently. A flexible grid-connected and off-grid switching device for a microgrid is a device used in a microgrid system to achieve smooth and intelligent connection and separation between the microgrid and the main grid. When the microgrid needs to be connected to the main grid, this device can enable the microgrid to be safely and stably connected, realize power interaction between the two, so that the excess electric energy in the microgrid can be transmitted to the main grid, and at the same time obtain electric energy from the main grid when necessary; when a fault occurs in the main grid, the device quickly cuts off the connection with the main grid, so that the microgrid can rely on its own power sources (such as solar energy, wind energy, energy storage devices, etc.) to maintain internal power supply under the condition of being disconnected from the main grid; flexible switching emphasizes the smoothness of the switching process, minimizes the impact on the microgrid and the main grid, reduces voltage and frequency fluctuations, and ensures the normal operation of electrical equipment.

[0003] For the grid-connected and off-grid switching device of the energy storage inverter of the Chinese invention with the application number CN202222469160.3, the grid-connected terminal and the off-grid terminal are respectively connected to the grid relay protectors of different lines. When it is necessary to switch the grid line due to grid anomalies, the rotation controller controls the inner shaft body to rotate. The inner shaft body drives the control inner core to rotate. The arc-shaped terminal connected by the connection column on the control inner core will be driven to rotate, and the grid-connected terminal will be disconnected from the arc-shaped terminal to achieve power-off; during the continuous rotation of the control inner core, the arc-shaped terminal at the other end will contact the off-grid terminal, and the metal contact on the arc-shaped terminal will contact the metal connection terminal slot connected to the off-grid terminal to achieve the effect of power-on. However, when switching the circuit, multiple relays open and close simultaneously, and there is no insulation barrier between the relays, resulting in the arc generated when the relays open and close interfering with the normal opening and closing of the relays and affecting the switching state of the microgrid. Summary of the Invention

[0004] The main purpose of the present invention is to provide a flexible grid-connected and off-grid switching device for a microgrid to solve the problem in the related technology that there is no insulation barrier between relays, resulting in the arc generated when the relays open and close interfering with the normal opening and closing of the relays and affecting the switching state of the microgrid.

[0005] To achieve the above object, according to one aspect of the present invention, a flexible grid-connected and islanding switching device for a microgrid is provided, including: a support part, the support part includes an electromagnet, and the electromagnet is connected to the main grid; A sliding part, the sliding part is slidably arranged above the support part, the sliding part includes an arc-shaped block, and the arc-shaped block is connected to the microgrid. When the arc-shaped block fits on the surface of the electromagnet, the circuit of the microgrid is connected to the circuit of the main grid; An opening and closing part, the opening and closing part is fixedly arranged on one side of the sliding part, the opening and closing part includes a group of isolation plates and a plurality of conductive rods, and the group of isolation plates separates two adjacent conductive rods; A conduction part, the conduction part is fixedly arranged on the upper surface of the support part and is located outside the opening and closing part, the conduction part includes a group of conduction grooves, and the group of conduction grooves is used to accommodate the group of isolation plates; A transfer part, there are a plurality of transfer parts, and the transfer parts are all rotatably arranged in the conduction part. When the opening and closing part moves towards the conduction part, the arc-shaped block leaves the electromagnet, the conductive rod contacts the transfer part, the circuit of the microgrid is disconnected from the circuit of the main grid, and the circuit of the microgrid is connected.

[0006] Further, the support part further includes a base, a plurality of chutes and a plurality of compression springs. The electromagnet is fixedly arranged at the front end of the upper surface of the base. The chutes are all arranged on the upper surface of the base and are located behind the electromagnet. The compression springs are all located at the front end of the chutes, and the front ends of the compression springs are fixedly connected to the base.

[0007] Further, the sliding part further includes a sliding plate and a plurality of guide rails. The arc-shaped block is fixedly arranged at the front end of the sliding plate. The guide rails are all fixedly arranged on the lower surface of the sliding plate. The guide rails are all slidably arranged in the corresponding chutes, and the front ends of the guide rails are fixedly connected to the compression springs.

[0008] Further, the group of isolation plates includes an isolation top plate, two isolation outer vertical plates, an isolation bottom plate and a plurality of isolation inner vertical plates. The isolation top plate is fixedly arranged at the upper end of the rear side of the sliding plate. The isolation bottom plate is fixedly arranged at the lower end of the rear side of the sliding plate. The two isolation outer vertical plates are respectively fixedly arranged at the left and right ends of the rear side of the sliding plate. The isolation inner vertical plates are all fixedly arranged in the middle of the rear side of the sliding plate. The two isolation outer vertical plates and the plurality of isolation inner vertical plates and the isolation top plate and the isolation bottom plate enclose a plurality of small spaces.

[0009] Further, the opening and closing part further includes a plurality of push blocks, the push blocks are all fixedly arranged on the lower surface of the isolation top plate, and the conductive rods are fixedly arranged at the rear side of the sliding plate.

[0010] Further, the conduction part further includes a conduction block and a plurality of inner grooves. The inner grooves are all arranged at the front side of the conduction block and are used to accommodate the transfer parts.

[0011] Furthermore, the conductive groove group includes an upper conductive groove, a lower conductive groove, two external conductive grooves and a plurality of internal conductive grooves, the upper conductive groove is located above the front side of the conductive block, the lower conductive groove is located below the front side of the conductive block, the two external conductive grooves are respectively located at the left and right ends of the front side of the conductive block, and the internal conductive grooves are all located in the middle of the front side of the conductive block.

[0012] Furthermore, the two outer conductive grooves and the plurality of inner conductive grooves, the upper conductive groove and the lower conductive groove enclose a plurality of small spaces, which surround the inner groove.

[0013] Furthermore, the adapter portion includes a connecting shaft, an upper rod group and a lower stem group, the upper rod group includes an upper push rod and a plurality of columnar rollers, and the lower stem group includes a lower push rod and a conductive block.

[0014] Furthermore, the connecting shaft is rotatably connected to the guide block, the upper push rod is fixedly arranged above the connecting shaft, the cylindrical rollers are rotatably arranged at the top front end of the upper push rod, the lower push rod is fixedly arranged below the connecting shaft, and the conductive block is fixedly arranged at the outer end of the lower push rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: when the microgrid needs to be incorporated into the main power grid, the arc block is attached to the surface of the electromagnet, and the conductive rod leaves the conductive block. At this time, the front end of the isolation top plate is still located in the conductive upper groove, the front end of the isolation outer vertical plate is still located in the corresponding conductive outer vertical groove, the front end of the isolation bottom plate is still located in the conductive lower groove, and the front end of the isolation inner vertical plate is still located in the corresponding conductive inner vertical groove, so that the adjacent conductive rods are separated, so that the conductive rods and the corresponding conductive blocks are in a closed space, so as to prevent the arc generated at the moment of separation of the conductive rods and the conductive blocks from interfering with each other, so that the conductive rods and the conductive blocks cannot be separated in time, and the disconnection of the microgrid circuit is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of a flexible on-grid and off-grid switching device for a microgrid of the present invention; Figure 2 This is a schematic diagram of the support structure of the flexible on-grid and off-grid switching device for a microgrid of the present invention; Figure 3 It is a schematic diagram of the structure of the sliding part of the flexible on-grid and off-grid switching device for microgrid of the present invention; Figure 4 It is a schematic diagram of the structure of the opening and closing part of the flexible on-grid and off-grid switching device for microgrid of the present invention; Figure 5 It is a schematic diagram of the structure of the conducting part of the flexible on-grid and off-grid switching device for microgrid of the present invention; Figure 6 A schematic diagram of a microgrid off-grid of a flexible on-grid and off-grid switching device for a microgrid of the present invention; Figure 7Schematic diagram of the microgrid grid connection of the flexible grid connection and disconnection switching device for the present invention; Figure 8 Schematic diagram of the transfer part of the flexible grid connection and disconnection switching device for the microgrid of the present invention.

[0017] Illustration description: 1. Support part; 11. Base; 12. Slide groove; 13. Compression spring; 14. Electromagnet; 2. Sliding part; 21. Sliding plate; 22. Guide rail; 23. Arc-shaped block; 3. Opening and closing part; 31. Isolation top plate; 32. Isolation outer vertical plate; 33. Isolation bottom plate; 34. Isolation inner vertical plate; 35. Pushing block; 36. Conductive rod; 4. Conductive part; 41. Conductive block; 42. Upper conductive groove; 43. Lower conductive groove; 44. Outer vertical conductive groove; 45. Inner vertical conductive groove; 46. Inner groove; 5. Transfer part; 51. Connecting shaft; 52. Upper push rod; 53. Lower push rod; 54. Columnar roller; 55. Conductive block. Specific implementation manner

[0018] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manner, structure, features and their effects of the present invention as follows.

[0019] Please refer to Figures 1 to 8 , this embodiment provides a flexible grid connection and disconnection switching device for a microgrid, including: a support part 1, the support part 1 includes an electromagnet 14, and the electromagnet 14 is connected to the main grid; A sliding part 2, the sliding part 2 is slidably arranged above the support part 1, the sliding part 2 includes an arc-shaped block 23, the arc-shaped block 23 is connected to the microgrid, and when the arc-shaped block 23 fits on the surface of the electromagnet 14, the circuit of the microgrid is connected to the circuit of the main grid; An opening and closing part 3, the opening and closing part 3 is fixedly arranged on one side of the sliding part 2, the opening and closing part 3 includes an isolation plate group and a plurality of conductive rods 36, and the isolation plate group separates two adjacent conductive rods 36; A conductive part 4, the conductive part 4 is fixedly arranged on the upper surface of the support part 1 and is located outside the opening and closing part 3, the conductive part 4 includes a conductive groove group, and the conductive groove group is used to accommodate the isolation plate group; A transfer part 5, there are a plurality of transfer parts 5, the transfer parts 5 are all rotatably arranged in the conductive part 4, when the opening and closing part 3 moves towards the conductive part 4, the arc-shaped block 23 leaves the electromagnet 14, the conductive rod 36 contacts the transfer part 5, the circuit of the microgrid is disconnected from the circuit of the main grid, and the circuit of the microgrid is connected.

[0020] The support part 1 also includes a base 11, a plurality of slide grooves 12 and a plurality of compression springs 13. The electromagnet 14 is fixedly arranged at the front end of the upper surface of the base 11. The slide grooves 12 are all arranged on the upper surface of the base 11 and are located at the rear side of the electromagnet 14. The compression springs 13 are all located at the front end of the slide grooves 12, and the front end of the compression springs 13 is fixedly connected to the base 11.

[0021] The sliding part 2 also includes a sliding plate 21 and a plurality of guide rails 22. The arc block 23 is fixed at the front end of the sliding plate 21. The guide rails 22 are fixed at the lower surface of the sliding plate 21. The guide rails 22 are slidably arranged in the corresponding sliding grooves 12. The front ends of the guide rails 22 are fixedly connected to the compression springs 13. When the arc block 23 is attracted and slides by the electromagnet 14, the guide rails 22 squeeze the compression springs 13 to shrink and store energy. When the magnetism of the electromagnet 14 disappears, the compression springs 13 rebound to push the arc block 23 away from the electromagnet 14.

[0022] The isolation plate group includes an isolation top plate 31, two isolation outer vertical plates 32, an isolation bottom plate 33 and a plurality of isolation inner vertical plates 34. The isolation top plate 31 is fixed at the upper end of the rear side of the sliding plate 21, the isolation bottom plate 33 is fixed at the lower end of the rear side of the sliding plate 21, the two isolation outer vertical plates 32 are respectively fixed at the left and right ends of the rear side of the sliding plate 21, and the isolation inner vertical plates 34 are all fixed at the middle of the rear side of the sliding plate 21. The two isolation outer vertical plates 32 and the plurality of isolation inner vertical plates 34 enclose a plurality of small spaces with the isolation top plate 31 and the isolation bottom plate 33.

[0023] The opening and closing part 3 also includes a plurality of push blocks 35, which are fixed on the lower surface of the isolation top plate 31, and the conductive rod 36 is fixed on the rear side of the sliding plate 21. The lowest point of the push block 35 is always lower than the highest point of the upper push rod 52 to prevent the highest point of the upper push rod 52 from sliding down from the lowest point of the push block 35. The push block 35 cannot push the upper push rod 52 to rotate, and the conductive block 55 cannot contact the conductive rod 36. The microgrid circuit cannot be closed, resulting in its inability to operate independently from the main power grid.

[0024] The conducting portion 4 further includes a conducting block 41 and a plurality of inner grooves 46 . The inner grooves 46 are all arranged at the front side of the conducting block 41 for accommodating the adapter portion 5 .

[0025] The guide groove group includes an upper guide groove 42, a lower guide groove 43, two outer guide grooves 44 and a plurality of inner guide grooves 45. The upper guide groove 42 is located above the front side of the guide block 41, the lower guide groove 43 is located below the front side of the guide block 41, the two outer guide grooves 44 are respectively located at the left and right ends of the front side of the guide block 41, and the inner guide grooves 45 are all located in the middle of the front side of the guide block 41.

[0026] The two external conducting grooves 44 and the plurality of internal conducting grooves 45 , the upper conducting groove 42 and the lower conducting groove 43 enclose a plurality of small spaces, and surround the inner groove 46 therein.

[0027] The transfer part 5 includes a connecting shaft 51, an upper rod group and a lower rod group. The upper rod group includes an upper push rod 52 and a plurality of columnar rollers 54. The lower rod group includes a lower push rod 53 and a conductive block 55. A torsion spring for resetting the connecting shaft 51 is provided at the junction of the connecting shaft 51 and the conduction block 41. When the push block 35 pushes the upper push rod 52 to rotate clockwise, the torsion spring is compressed. When the push block 35 leaves the upper push rod 52, the torsion spring drives the upper push rod 52 to rotate counterclockwise.

[0028] The connecting shaft 51 is rotatably connected to the conduction block 41. The upper push rod 52 is fixedly arranged above the connecting shaft 51. The columnar rollers 54 are all rotatably arranged at the front top end of the upper push rod 52. The lower push rod 53 is fixedly arranged below the connecting shaft 51. The conductive block 55 is fixedly arranged at the outer end of the lower push rod 53.

[0029] The electromagnet 14 includes a coil and an iron core inserted in the coil. The coil is connected in series to the main power grid. When the main power grid is powered on, the coil generates a magnetic field. The magnetic domains in the iron core will quickly align neatly under the action of the magnetic field, making the magnetic field greatly enhanced, amplifying the relatively weak magnetic field originally generated by the current into a very strong magnetic field, so that the electromagnet has a strong magnetism, strong enough to overcome the elastic force of the compression spring 13.

[0030] Two terminal blocks are installed on the surface of the electromagnet 14. The arc-shaped block 23 is made of iron with relatively strong magnetism and is coated with insulating paint on the surface. Two copper sheets are installed on the surface of the arc-shaped block 23. The copper sheets are connected to the micro power grid circuit. After the electromagnet 14 conducts electricity to generate magnetism, it generates a strong magnetic attraction on the arc-shaped block 23, causing the arc-shaped block 23 to drive the opening and closing part 3 to slide away from the conduction part 4 towards the electromagnet 14 and adsorb the arc-shaped block 23 on its surface, making the two copper sheets respectively contact the two terminal blocks one by one, and merging the circuit of the micro power grid into the main power grid.

[0031] Both ends of the coil of the electromagnet 14 are respectively connected to the external main power grid, and the electromagnet 14 is connected in series in the main power grid. When the main power grid conducts electricity normally, there is an electric current passing through the coil of the electromagnet 14. Due to the magnetic effect of the current, a magnetic field will be generated around the electromagnet 14, making the electromagnet 14 magnetic and generating an attractive force on the arc-shaped block 23, adsorbing the arc-shaped block 23 on the surface of the electromagnet 14. The copper sheet of the arc-shaped block 23 is connected to the terminal on the surface of the electromagnet 14, connecting the circuit of the microgrid to the main power grid. At the same time, the arc-shaped block 23 drives the sliding plate 21 to move along the sliding groove 12 towards the electromagnet 14, and the guide rail 22 squeezes the compression spring 13, and the compression spring 13 contracts to store energy. The opening and closing part 3 moves synchronously with the sliding plate 21, making the conductive rod 36 slowly leave the conductive block 55, and the circuit of the microgrid is disconnected, smoothly merging into the main power grid, completing the process of the microgrid flexibly merging into the main power grid. At this time, the front end of the isolation top plate 31 is still located in the conduction upper groove 42, the front end of the isolation outer vertical plate 32 is still located in the corresponding conduction outer vertical groove 44, the front end of the isolation bottom plate 33 is still located in the conduction lower groove 43, and the front end of the isolation inner vertical plate 34 is still located in the corresponding conduction inner vertical groove 45, separating adjacent conductive rods 36, making the conductive rod 36 and the corresponding conductive block 55 in a closed space, preventing the arc generated at the moment when the conductive rod 36 and the conductive block 55 are separated from interfering with each other, resulting in the inability of the conductive rod 36 and the conductive block 55 to be separated in time, affecting the disconnection of the microgrid circuit. As the opening and closing part 3 leaves, the outer edge of the isolation top plate 31 no longer presses the upper push rod 52, and the transfer part 5 rotates counterclockwise under the action of the torsional spring resilience at the connecting shaft 51, driving the conductive block 55 to leave the conductive rod 36, and the microgrid is merged into the main power grid; when a fault occurs in the main power grid, there is no current passing through its circuit, the magnetism of the electromagnet 14 disappears, and no longer generates suction on the arc-shaped block 23. The compression spring 13 starts to rebound, pushing the arc-shaped block 23 away from the main power grid, and the circuit of the microgrid is separated from the circuit of the main power grid. At the same time, the arc-shaped block 23 drives the opening and closing part 3 to move towards the conduction part 4 through the sliding plate 21. After the push block 35 touches the upper push rod 52, it pushes the transfer part 5 to rotate clockwise around the connecting shaft 51. As the opening and closing part 3 moves, the conductive block 55 slowly fits on the lower surface of the front end of the conductive rod 36, the circuit of the microgrid is connected, and after smoothly leaving the main power grid, it operates independently, completing the process of the microgrid flexibly disconnecting from the grid. The isolation top plate 31 is inserted into the conduction upper groove 42, the isolation outer vertical plate 32 is inserted into the corresponding conduction outer vertical groove 44, the isolation bottom plate 33 is inserted into the conduction lower groove 43, and the isolation inner vertical plate 34 is inserted into the corresponding conduction inner vertical groove 45, separating two adjacent conductive rods 36, making the conductive rod 36 and the conductive block 55 in a relatively independent space, without interfering with each other.

[0032] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A flexible grid-connected and off-grid switching device for a microgrid, characterized in that, Comprising: A support part (1), the support part (1) includes an electromagnet (14), and the electromagnet (14) is connected to the main power grid; A sliding part (2), the sliding part (2) is slidably arranged above the support part (1), the sliding part (2) includes an arc-shaped block (23), and the arc-shaped block (23) is connected to the micro power grid. When the arc-shaped block (23) fits on the surface of the electromagnet (14), the circuit of the micro power grid is connected to the circuit of the main power grid; An opening and closing part (3), the opening and closing part (3) is fixedly arranged on one side of the sliding part (2), the opening and closing part (3) includes an isolation plate group and a plurality of conductive rods (36), and the isolation plate group separates two adjacent conductive rods (36); A conduction part (4), the conduction part (4) is fixedly arranged on the upper surface of the support part (1) and is located outside the opening and closing part (3), the conduction part (4) includes a conduction groove group, and the conduction groove group is used to accommodate the isolation plate group; There are a plurality of transfer parts (5), and the transfer parts (5) are all rotatably arranged in the conduction part (4). When the opening and closing part (3) moves towards the conduction part (4), the arc-shaped block (23) leaves the electromagnet (14), the conductive rod (36) contacts the transfer part (5), the circuit of the micro power grid is disconnected from the circuit of the main power grid, and the circuit of the micro power grid is connected.

2. The flexible grid-connected and islanding switching device for a microgrid according to claim 1, wherein The support part (1) further includes a base (11), a plurality of chutes (12) and a plurality of compression springs (13). The electromagnet (14) is fixedly arranged at the front end of the upper surface of the base (11). The chutes (12) are all arranged on the upper surface of the base (11) and are located behind the electromagnet (14). The compression springs (13) are all located at the front ends of the chutes (12), and the front ends of the compression springs (13) are fixedly connected to the base (11).

3. The flexible grid-connected and islanding switching device for a microgrid according to claim 2, wherein, The sliding part (2) further includes a sliding plate (21) and a plurality of guide rails (22). The arc-shaped block (23) is fixedly arranged at the front end of the sliding plate (21). The guide rails (22) are all fixedly arranged on the lower surface of the sliding plate (21), and the guide rails (22) are all slidably arranged in the corresponding chutes (12). The front ends of the guide rails (22) are all fixedly connected to the compression springs (13).

4. The flexible grid-connected and islanding switching device for microgrid according to claim 3, characterized in that The isolation plate group includes an isolation top plate (31), two isolation outer vertical plates (32), an isolation bottom plate (33) and a plurality of isolation inner vertical plates (34). The isolation top plate (31) is fixedly arranged at the upper rear end of the sliding plate (21). The isolation bottom plate (33) is fixedly arranged at the lower rear end of the sliding plate (21). The two isolation outer vertical plates (32) are respectively fixedly arranged at the left and right ends of the rear side of the sliding plate (21). The isolation inner vertical plates (34) are all fixedly arranged in the middle of the rear side of the sliding plate (21). The two isolation outer vertical plates (32) and a plurality of isolation inner vertical plates (34) enclose a plurality of small spaces with the isolation top plate (31) and the isolation bottom plate (33).

5. The flexible grid-connected and islanding switching device for a microgrid according to claim 4, characterized in that, The opening and closing part (3) further includes a plurality of push blocks (35), the push blocks (35) are all fixedly arranged on the lower surface of the isolation top plate (31), and the conductive rods (36) are fixedly arranged at the rear side of the sliding plate (21).

6. The flexible grid-connected and off-grid switching device for a microgrid according to claim 1, characterized in that, The conducting portion (4) further comprises a conducting block (41) and a plurality of inner grooves (46); the inner grooves (46) are all arranged on the front side of the conducting block (41) and are used to accommodate the adapter portion (5).

7. The flexible grid-connected and islanding switching device for a microgrid according to claim 6, characterized in that, The guide groove group comprises an upper guide groove (42), a lower guide groove (43), two outer guide grooves (44) and a plurality of inner guide grooves (45); the upper guide groove (42) is located above the front side of the guide block (41); the lower guide groove (43) is located below the front side of the guide block (41); the two outer guide grooves (44) are respectively located at the left and right ends of the front side of the guide block (41); and the inner guide grooves (45) are all located in the middle of the front side of the guide block (41).

8. The flexible grid-connected and off-grid switching device for a microgrid according to claim 7, characterized in that, The two external conductive grooves (44) and the plurality of internal conductive grooves (45) together with the upper conductive groove (42) and the lower conductive groove (43) enclose a plurality of small spaces, enclosing the inner groove (46).

9. The flexible grid-connected and islanding switching device for a microgrid according to claim 6, wherein, The adapter (5) comprises a connecting shaft (51), an upper rod group and a lower stem group, the upper rod group comprises an upper push rod (52) and a plurality of columnar rollers (54), and the lower stem group comprises a lower push rod (53) and a conductive block (55).

10. The flexible grid-connected and off-grid switching device for a microgrid according to claim 9, characterized in that, The connecting shaft (51) is rotatably connected to the guide block (41), the upper push rod (52) is fixedly arranged above the connecting shaft (51), the columnar rollers (54) are rotatably arranged at the front top end of the upper push rod (52), the lower push rod (53) is fixedly arranged below the connecting shaft (51), and the conductive block (55) is fixedly arranged at the outer end of the lower push rod (53).

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