Networking compact type converting and boosting all-in-one machine

Abstract

The invention relates to a net-forming compact type current transforming and boosting all-in-one machine which is characterized by comprising a base frame unit, a box cover heat insulation unit, a box body, a high-voltage switch isolation assembly, a transformer assembly, a communication control cabinet and a net-forming type current transformer, and the box body, the high-voltage switch isolation assembly, the transformer assembly, the communication control cabinet and the net-forming type current transformer are integrated on the base frame unit. The high-voltage switch isolation assembly, the transformer assembly and the communication control cabinet are arranged in the box body, a heat dissipation assembly is arranged on the box body, the wire outlet side of the high-voltage switch isolation assembly is electrically connected with the high-voltage side of the transformer assembly, and the low-voltage side of the transformer assembly is electrically connected with the grid-forming converter. And the high-voltage switch isolation assembly, the transformer assembly and the network-forming converter are respectively connected with the communication control cabinet. The invention solves the problems of unbalanced supply and demand of new energy, unstable power grid, no support in short-time fault of the power grid, large occupied area of energy storage equipment, and easy damage of the equipment due to long-distance transportation and bumpy road surface.

Description

Technical Field

[0001] The present invention specifically relates to a compact grid-forming integrated converter and booster, belonging to the technical field of power electronic equipment. Background Art

[0002] At present, with the rapid development of the energy storage industry, the requirements for grid stability in remote areas are constantly increasing. Grid-building type integrated converters and boosters can play an important role in grids with a high proportion of renewable energy power generation. They have the ability to short-term support grid voltage and frequency, solving the problem of maintaining grid stability when short-term grid faults occur. They can even serve as a seed power source to quickly reconstruct the power system after a grid collapse. Grid-building type integrated converters and boosters with the ability to short-term support grids will be the development direction.

[0003] As the capacity of energy storage power stations increases, the floor space occupied by energy storage equipment also increases. To minimize the equipment's footprint, ensuring the capacity of the integrated converter and booster while maintaining a compact structure has become an effective solution. Long-distance transport requires complex road conditions. Meeting conventional transport restrictions, reducing equipment transportation costs, and ensuring equipment throughput are essential, addressing vibration damage caused by long-distance transport and bumpy road conditions. Therefore, a compact converter and booster with networking capabilities, excellent transportability, and robust resistance to bumps addresses several pressing industry challenges. Summary of the Invention

[0004] The purpose of the present invention is to provide a compact integrated converter and booster for networking, which can solve the problems of unbalanced supply and demand of new energy, unstable power grid, lack of support for short-term power grid failure, large footprint of energy storage equipment, and easy damage to equipment due to long-distance transportation and bumpy roads.

[0005] In order to achieve the above-mentioned object, the technical solution of the present invention is: a compact grid-forming converter and booster integrated unit, the innovation of which is that it includes a base frame unit and a cover insulation unit, as well as a box body integrated on the base frame unit, a high-voltage switch isolation assembly, a transformer assembly, a communication control cabinet and a grid-forming converter.

[0006] The box and the grid-type converter are arranged side by side on the base frame unit, and the grid-type converter is arranged outside the box. The box cover heat insulation unit is arranged at the top opening of the box. The high-voltage switch isolation assembly, transformer assembly and communication control cabinet are all arranged inside the box. The box is provided with a heat dissipation assembly for dissipating heat inside the box to realize heat dissipation and air cooling circulation.

[0007] The outgoing line side of the high-voltage switch isolation assembly is electrically connected to the high-voltage side of the transformer assembly, and the low-voltage side of the transformer assembly is electrically connected to the meshed converter. The high-voltage switch isolation assembly, transformer assembly and meshed converter are respectively connected to the corresponding control communication sampling port cables of the communication control cabinet.

[0008] In the above technical solution, the base frame unit is an integrated steel structure frame, an air inlet is provided on the base frame unit and at the bottom of the box, and an air inlet mesh assembly is provided at the air inlet to prevent foreign matter from entering the box.

[0009] In the above technical solution, the box body is provided with independent high-voltage chamber, low-voltage chamber and communication chamber. The transformer assembly includes a main transformer for high-low voltage conversion and an auxiliary transformer for meeting the power demand of internal equipment. The high-voltage switch isolation assembly and the main transformer are both arranged in the high-voltage chamber, the auxiliary transformer is arranged in the low-voltage chamber, and the communication control cabinet is arranged in the communication chamber.

[0010] The outgoing line side of the high-voltage switch isolation assembly is electrically connected to the high-voltage side of the main transformer, and the low-voltage side of the main transformer is electrically connected to the grid-type converter and the auxiliary transformer at the same time.

[0011] In the above technical solution, the outgoing line side of the high-voltage switch isolation assembly is electrically connected to the high-voltage side of the main transformer through a high-voltage copper busbar, and the low-voltage side of the main transformer is electrically connected to the grid-type converter through a low-voltage copper busbar. At the same time, the low-voltage side of the main transformer is also connected to the auxiliary transformer through a cable.

[0012] In the above technical solution, the base frame unit is further provided with a raised seat assembly for supporting the converter and ensuring random vibration safety, and the meshed converter is mounted on the raised seat assembly.

[0013] In the above technical solution, the raised seat assembly includes a raised base welded into a frame structure, the internal interlayer of the raised base integrates a busbar bridge, a busbar and a branch copper busbar, the AC side of the grid-type converter is connected to the busbar provided in the busbar bridge through the branch copper busbar, the DC side is connected to the energy storage battery pack through a cable, and the low-voltage side of the transformer assembly is connected to the busbar through a low-voltage copper busbar.

[0014] In the above technical solution, the elevated base is also provided with a busbar bridge cover which is sealed and waterproof, and the busbar bridge cover is located on the outside of the busbar bridge. The bottom plate of the busbar bridge is provided with a first heat dissipation duct for ensuring heat dissipation and ventilation of the busbar.

[0015] In the above technical solution, the heat dissipation component includes a plurality of heat dissipation fans and air inlet louvers arranged on both sides of the box body, a plurality of separately arranged heat dissipation fans are provided on the box body and near the top thereof, and a second heat dissipation duct is arranged at the outlet position of the heat dissipation fan for guiding the direction of the hot air and preventing the hot air from flowing back into the interior of the box body, and a plurality of waterproof and dustproof air inlet louvers are provided on the side wall of the box body. External cold air enters the box body through the air inlet of the base frame unit and the air inlet louvers on the side wall of the box body, flows through the transformer assembly to dissipate heat, and after the hot air rises, it is guided away from the outside of the box body under the action of the heat dissipation fan and through the heat dissipation duct to complete the heat dissipation cycle.

[0016] In the above technical solution, two first inspection doors are provided on the side wall of the box body for inspecting the high-voltage switch isolation assembly, two second inspection doors are provided on the side wall of the box body for inspecting the main transformer, a third inspection door is provided on the side wall of the box body for inspecting the auxiliary transformer, and a fourth inspection door is provided on the side wall of the box body for inspecting the communication control cabinet. A safety net door is provided on the inner side of each of the first inspection door and the second inspection door.

[0017] In the above technical solution, the box cover heat insulation unit includes a box cover main body, which includes a box cover keel with a hollow structure, the top of the box cover keel is covered with a waterproof top plate, and the bottom is covered with an insulation board; the box cover main body is provided with an installation groove nested with the box body, and forms a structural waterproof. At the same time, the screws provided on the periphery of the box cover main body are docked with the preset screw holes of the box body to form a detachable screw connection. The box cover main body also integrates lighting and fire detection components and hoisting ears for convenient hoisting.

[0018] In the above technical solution, the high-voltage switch isolation assembly includes a support frame and a combination switch. The support frame is fixed inside the box, and the combination switch is suspended on the support frame.

[0019] The combination switch includes an incoming copper busbar, an isolating switch, a vacuum circuit breaker, a grounding switch and a current transformer. The incoming copper busbar is connected to the static contact of the isolating switch, the moving contact of the isolating switch is connected to the static contact of the vacuum circuit breaker, the moving contact of the vacuum circuit breaker is connected to the incoming terminal P1 of the current transformer, and the outgoing terminal P2 of the current transformer is connected to the static contact of the grounding switch. At the same time, the static contact of the grounding switch is connected in parallel with the high-voltage copper busbar on the high-voltage side of the transformer assembly. A lightning arrester connected to the incoming copper busbar is also provided on the support frame.

[0020] In the above technical solution, the upper layer of the base frame unit is provided with a load-bearing steel plate with no deformation of the footrest.

[0021] A cable trough box for arranging the secondary circuit cables is provided in the interlayer of the base frame unit and below the communication cabinet.

[0022] A plurality of lifting rods are provided on both sides of the base frame unit in the length direction, which are used to bear the dead weight of the whole machine during transportation and lifting.

[0023] The base frame unit is provided with inlet and outlet holes, cable clamps, a maintenance manhole, and a grounding terminal block for grounding the grid-type converter below the grid-type converter.

[0024] The base frame unit is also provided with a grounding copper busbar connected to the high-voltage switch isolation assembly.

[0025] In the above technical solution, the box body is provided with a live display for monitoring high voltage signals, and the safety net door is provided with an electromagnetic lock and a travel switch. The live display forms an electrical interlock with the electromagnetic lock and the travel switch. The auxiliary contacts of the live display are also connected to the power supply circuit of the electromagnetic lock, and the auxiliary contacts of the travel switch are connected to the corresponding connection ends of the high-voltage switch isolation assembly.

[0026] The positive effects of the present invention are as follows: after adopting the network-forming compact converter and booster integrated unit of the present invention, since it includes a base frame unit and a box cover heat insulation unit, as well as a box body integrated on the base frame unit, a high-voltage switch isolation assembly, a transformer assembly, a communication control cabinet and a network-forming converter,

[0027] The box and the grid-type converter are arranged side by side on the base frame unit, and the grid-type converter is arranged outside the box. The box cover heat insulation unit is arranged at the top opening of the box. The high-voltage switch isolation assembly, transformer assembly and communication control cabinet are all arranged inside the box. The box is provided with a heat dissipation assembly for dissipating heat inside the box to realize heat dissipation and air cooling circulation.

[0028] The outgoing line side of the high-voltage switch isolation assembly is electrically connected to the high-voltage side of the transformer assembly, and the low-voltage side of the transformer assembly is electrically connected to the meshing converter. The high-voltage switch isolation assembly, the transformer assembly, and the meshing converter are respectively connected to the corresponding control communication sampling port cables of the communication control cabinet;

[0029] The present invention adopts a grid-type converter with grid-forming capabilities. To cope with the increased heat generation of equipment caused by high-power operation under grid-forming conditions, the box adopts an enhanced heat dissipation design, and air inlets are provided on the bottom and side walls of the box to increase the air inlet area. The air path covers the heat-generating components, ensuring that the heat dissipation performance greatly meets the design requirements. At the same time, all primary main circuit components of the present invention have undergone heat generation simulation verification to ensure that all components operate safely and stably under grid-forming conditions.

[0030] The integrated converter and booster system of this invention adopts a straight-line layout, with the converters arranged side by side, close to the housing. This compact arrangement avoids wasted space, effectively reducing the size of the converter and booster, ensuring maintainability, and improving operational safety. This system addresses issues such as imbalanced supply and demand of renewable energy, unstable power grids, lack of support for short-term grid failures, large footprints for energy storage equipment, and vulnerability to damage caused by long-distance transportation and bumpy roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0032] Figure 2 It is another schematic diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0034] Figure 4 yes Figure 3 Schematic top view of

[0035] Figure 5 It is a structural schematic diagram of the base frame unit of the present invention;

[0036] Figure 6 It is a structural diagram of the box and heat dissipation assembly of the present invention;

[0037] Figure 7 It is a structural schematic diagram of the heat insulation unit of the box cover of the present invention;

[0038] Figure 8 It is a structural diagram of the assembly of the grid-type converter and the raised seat assembly of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and given embodiments, but the present invention is not limited thereto.

[0040] like Figure 1 、 2 , 3, 4, 5, 6, 7, and 8 show a compact grid-forming converter and booster, comprising a base frame unit 1 and a cover insulation unit 3, as well as a box body 2 integrated on the base frame unit 1, a high-voltage switch isolation assembly 4, a transformer assembly 5, a communication control cabinet 6, and a grid-forming converter 8.

[0041] The box body 2 and the grid-type converter 8 are arranged side by side on the base frame unit 1, and the grid-type converter (8) is arranged outside the box body 2, the box cover heat insulation unit 3 is arranged at the top opening of the box body 2, the high-voltage switch isolation assembly 4, the transformer assembly 5 and the communication control cabinet 6 are all arranged inside the box body 2, and the box body 2 is provided with a heat dissipation assembly for dissipating heat inside the box body to realize heat dissipation and air cooling circulation.

[0042] The outgoing line side of the high-voltage switch isolation assembly 4 is electrically connected to the high-voltage side of the transformer assembly 5, and the low-voltage side of the transformer assembly 5 is electrically connected to the mesh-type converter 8. The high-voltage switch isolation assembly 4, the transformer assembly 5 and the mesh-type converter 8 are respectively connected to the corresponding control communication sampling port cables of the communication control cabinet 6.

[0043] Furthermore, the base frame unit 1 described in the present invention is designed as an integrated steel structure frame, which bears the entire weight of the integrated machine and is the foundation of the converter and booster integrated machine. All equipment is installed on it to meet the requirements of anti-vibration damage during transportation and anti-deformation during overall lifting.

[0044] The box 2 and heat dissipation assembly are the main protective components of the indoor equipment. They integrate safety protection components and air-cooling and heat dissipation devices, and have safety protection, dustproof, waterproof, heat dissipation and other functions. The box 2 uses square tubes to form an overall frame structure, and the overall frame structure is welded to the box wall side panels.

[0045] The box cover heat insulation unit 3 is a rainproof and heat radiation proof component. The hollow structure of the box cover has waterproof and heat insulation capabilities. It is connected to the box wall through screws and is easy to disassemble and assemble.

[0046] The high-voltage switch isolation assembly 4 is a main component for high-voltage circuit switching, isolation, grounding, current sampling, and lightning protection. It is designed with a reinforced support frame for suspended installation and uses air insulation, with high integration and low cost.

[0047] The transformer assembly 5 is the main component of the step-up converter, used for high-low voltage conversion, and is integrated with an auxiliary transformer to meet the self-power supply requirements of the equipment.

[0048] The communication control cabinet 6 is the main equipment for system power distribution, monitoring and communication, and is responsible for the control, monitoring and communication functions of the converter and booster.

[0049] The raised seat assembly 7 adopts a welded frame structure. The raised seat is designed to strengthen the supporting beam for installing the converter. The internal interlayer of the raised seat is integrated with a busbar bridge, and the busbar bridge has waterproof and heat dissipation functions.

[0050] The grid-forming converter 8 is a main rectifier and inverter component with a multi-grid capability. The converter adopts a modular design and the number of converters can be increased or decreased according to capacity requirements. The converters are arranged in a straight line, which is compact and saves space.

[0051] Further, such as Figure 5 As shown, in order to be able to bear the entire weight of the all-in-one machine and meet the requirements of anti-vibration damage during transportation and anti-deformation during overall lifting, the base frame unit 1 is an integrated steel structure frame, and in order to prevent foreign matter from entering the interior of the box through the air inlet of the base frame unit, an air inlet is provided on the base frame unit 1 and at the bottom of the box 2, and an air inlet mesh assembly 101 is provided at the air inlet to prevent foreign matter from entering the interior of the box 2.

[0052] Further, such as Figure 3 、 4 As shown, in order to optimize the internal layout of the box, make the structure more reasonable and compact, and save space, the box 2 is provided with independent high-voltage chamber, low-voltage chamber and communication chamber. The transformer assembly 5 is the main equipment for system step-up and current conversion and equipment self-power supply, including a main transformer 501 for high-low voltage conversion and an auxiliary transformer 502 for meeting the working power requirements of internal equipment to form a self-powered system. The high-voltage switch isolation assembly 4 and the main transformer 501 are both arranged in the high-voltage chamber, the auxiliary transformer 502 is arranged in the low-voltage chamber, and the communication control cabinet 6 is arranged in the communication chamber.

[0053] The outgoing line side of the high-voltage switch isolation assembly 4 is electrically connected to the high-voltage side of the main transformer 501 , and the low-voltage side of the main transformer 501 is electrically connected to the grid-type converter 8 and the auxiliary transformer 502 at the same time.

[0054] Further, such as Figure 3 、 4 As shown, in order to facilitate rapid electrical connection between different components and ensure the reliability and stability of the electrical connection, the outgoing line side of the high-voltage switch isolation assembly 4 is electrically connected to the high-voltage side of the main transformer 501 through the high-voltage copper bus 503, and the low-voltage side of the main transformer 501 is electrically connected to the grid-type converter 8 through the low-voltage copper bus 504. At the same time, the low-voltage side of the main transformer 501 is also connected to the auxiliary transformer 502 through a cable.

[0055] Further, such as Figure 1 、 2 As shown in Figures 3 and 8, in order to support the meshing converter, the base frame unit 1 is further provided with a raised seat assembly 7 for supporting the converter and ensuring random vibration safety, and the meshing converter 8 is installed on the raised seat assembly 7.

[0056] Further, such as Figure 8As shown, in order to effectively protect the busbar, the raised seat assembly 7 includes a raised base welded into a frame structure, and is designed with reinforced support beams for installing the grid-forming converter. The internal interlayer of the raised base integrates the busbar bridge 701, the busbar 702 and the branch copper bus 703. The AC side of the grid-forming converter 8 is connected to the busbar 702 provided in the busbar bridge 701 through the branch copper bus 703, and the DC side is connected to the energy storage battery pack through a cable. The low-voltage side of the transformer assembly 5 is connected to the busbar 702 through the low-voltage copper bus 504.

[0057] Further, such as Figure 8 As shown, in order to facilitate the maintenance of the busbar and ensure the waterproofing and heat dissipation and ventilation of the upper part of the busbar bridge, the elevated base is also provided with a busbar bridge cover 705 which is sealed and connected thereto and is used for waterproofing, and the busbar bridge cover 705 is located on the outside of the busbar bridge 701, and the bottom plate of the busbar bridge 701 is provided with a first heat dissipation duct 704 for ensuring the heat dissipation and ventilation of the busbar.

[0058] Further, such as Figure 1 、 2 6, in order to achieve efficient heat dissipation, the heat dissipation component includes a plurality of heat dissipation fans 201 and air inlet louvers 205 arranged on both sides of the box body 2, so as to ensure that the hot air discharged by the heat dissipation fans will not flow back into the box body through the air inlet louvers, and prevent rainwater from entering the box body. The box body 2 is provided with a plurality of separately arranged heat dissipation fans 201 near its top, and a second heat dissipation duct 202 is arranged at the outlet position of the heat dissipation fan 201, which is used to guide the direction of the hot air and prevent the hot air from flowing back into the interior of the box body 2. The side walls of the box body 2 are provided with a plurality of waterproof and dustproof air inlet louvers 205. The high-pressure chamber, low-pressure chamber and communication room of the box body 2 are all provided with air inlet louvers and exhaust fans. The upper inner side of the box body 2 is provided with a heat dissipation fan, which is conducive to the flow of hot air and discharge under the action of the heat dissipation fan.

[0059] External cold air enters the box body 2 through the air inlet of the base frame unit 1 and the air inlet louvers 205 on the side wall of the box body 2, flows through the transformer assembly 5 to dissipate heat, and after the hot air rises, it is guided away from the outside of the box body 2 under the action of the heat dissipation fan 201 and through the heat dissipation duct 202, completing the heat dissipation cycle.

[0060] Further, such as Figure 1 、 2As shown, in order to facilitate the inspection and maintenance of different equipment, two first inspection doors 2031 are provided on the side wall of the box body 2 for inspecting the high-voltage switch isolation assembly 4, two second inspection doors 2032 are provided on the side wall of the box body 2 for inspecting the main transformer 501, a third inspection door 2033 is provided on the side wall of the box body 2 for inspecting the auxiliary transformer 502, and a fourth inspection door 2034 is provided on the side wall of the box body 2 for inspecting the communication control cabinet 6. A safety net door 204 is provided on the inner side of each of the first inspection door 2031 and the second inspection door 2032. This ensures that the first inspection door and the second inspection door can be opened to observe the indoor equipment when the equipment is running, but the safety net door cannot be opened, and personnel cannot access the high-voltage equipment, ensuring that personnel do not get electric shock. The safety net door can only be opened after all equipment is powered off.

[0061] Further, such as Figure 3 、 7 As shown, in order to make the box cover have rainproof and heat radiation protection properties, the box cover insulation unit 3 includes a box cover body, and the box cover body includes a box cover keel 301 with a hollow structure. The top of the box cover keel 301 is covered with a waterproof top plate 302, and the bottom is covered with an insulation board 303; the box cover body is provided with a mounting groove nested with the box body 2 to form a waterproof structure. At the same time, the screws provided on the periphery of the box cover body are docked with the preset screw holes of the box body 2 to form a detachable screw connection. The box cover body also integrates lighting and fire detection components and lifting ears 304 for convenient lifting.

[0062] Further, such as Figure 3 As shown, in order to make the high-voltage circuit on and off, isolated, grounded, current sampled, and lightning protected, the high-voltage switch isolation assembly 4 includes a support frame 406 and a combination switch. The support frame 406 is fixed inside the box 2, and the combination switch is suspended on the support frame 406.

[0063] The combination switch includes an incoming copper busbar 401, an isolating switch 402, a vacuum circuit breaker 403, an earthing switch 404 and a current transformer 405. The incoming copper busbar 401 is connected to the static contact of the isolating switch 402, the moving contact of the isolating switch 402 is connected to the static contact of the vacuum circuit breaker 403, the moving contact of the vacuum circuit breaker 403 is connected to the incoming terminal P1 of the current transformer 405, and the outgoing terminal P2 of the current transformer 405 is connected to the static contact of the earthing switch 404. At the same time, the static contact of the earthing switch 404 is connected in parallel with the high-voltage copper busbar 503 on the high-voltage side of the transformer assembly 5. A lightning arrester 407 connected to the incoming copper busbar 401 is also provided on the support frame 406.

[0064] The high-voltage switch isolation assembly 4 is designed according to air insulation to ensure the safe and stable operation of the 35kV power supply. The incoming line side is designed with a reinforced support wiring copper busbar, which can be connected to the incoming cable to ensure electrical safety while bearing the cable hanging pull force. The outgoing line side is designed to connect the copper busbar to the main transformer.

[0065] When connecting to the power grid: first open the grounding switch 404, close the isolation switch 402, and then close the vacuum circuit breaker 403;

[0066] When disconnecting from the power grid: first open the vacuum circuit breaker 403, then open the isolation switch 402, and finally close the grounding switch 404.

[0067] Further, such as Figure 5 As shown, in order to optimize and regularize the wiring and facilitate subsequent inspection and maintenance, a load-bearing steel plate with a non-deformable footrest is arranged on the upper layer of the base frame unit 1, and a cable trough box 105 for regularizing the wiring of the secondary circuit cables is provided in the interlayer of the base frame unit 1 and below the communication cabinet 6.

[0068] In order to facilitate hoisting, a number of hoisting rods 106 are provided on both sides of the length direction of the base frame unit 1 to bear the weight of the whole machine during transportation and hoisting.

[0069] In order to facilitate wiring, grounding and maintenance, the base frame unit 1 is provided with inlet and outlet holes and cable clamps 103, a maintenance manhole 102, and a grounding terminal block 107 for grounding the meshed converter 8 below the meshed converter 8.

[0070] The base frame unit 1 is further provided with a grounding copper bus 104 connected to the grounding knife switch 404 of the high-voltage switch isolation assembly 4 .

[0071] Furthermore, in order to achieve electrical interlocking and ensure maintainability while improving safety, the box body 2 is provided with a live display for monitoring high voltage signals, and the safety net door is provided with an electromagnetic lock and a travel switch. The live display and the electromagnetic lock and the travel switch form an electrical interlock, and the auxiliary contacts of the live display are also connected to the power supply circuit of the electromagnetic lock, and the auxiliary contacts of the travel switch are connected to the corresponding connection ends of the high-voltage switch isolation assembly 4.

[0072] Specifically: 1. When the 35kV high-voltage equipment is energized, the live display monitors a high voltage signal, and the auxiliary contacts of the live display separate and cut off the power circuit of the electromagnetic lock, making the electromagnetic lock unable to open. Since the electromagnetic lock is installed on the safety net door, the safety net door cannot be opened when the equipment is energized to prevent people from getting electric shock.

[0073] 2. When the 35kV high-voltage equipment is powered off, the live display cannot detect the high voltage signal. The auxiliary contacts of the live display are closed and the power circuit of the electromagnetic lock is connected. The electromagnetic lock can be opened. At this time, the operation and maintenance personnel can open the electromagnetic lock and enter the high-voltage room for maintenance.

[0074] 3. When the 35kV high-voltage equipment is energized, if someone forcibly opens the safety net door, a travel switch is installed between the net door and the door frame. The auxiliary contacts of the travel switch are connected, and a trip signal is output to the vacuum circuit breaker 403 of the high-voltage switch isolation assembly 4. The vacuum circuit breaker trips and cuts off the 35kV power supply to prevent people from getting electric shock.

[0075] 4. Before supplying power to the 35kV high-voltage equipment, the safety net door must be closed first. A travel switch is installed between the net door and the door frame. The auxiliary contacts of the travel switch are disconnected, and the output of the trip signal to the vacuum circuit breaker 403 stops. The vacuum circuit breaker 403 can be closed normally. If the safety net door is not closed, the vacuum circuit breaker cannot be closed, preventing people in the high-voltage room from mistakenly supplying power and causing electric shock accidents.

[0076] The present invention uses a grid-forming converter with grid-forming capabilities. To address the increased heat generation of equipment caused by high-power operation under grid-forming conditions, the box body adopts an enhanced heat dissipation design, and air inlets are provided at the bottom and side walls of the box body to increase the air inlet area. The box body uses eight cooling fans at the air outlet, and the air path covers the heat-generating components, ensuring that the heat dissipation performance greatly meets the design requirements. At the same time, all primary main circuit components of the present invention, including the copper busbar, have undergone heat generation simulation verification to ensure that all components operate safely and stably under grid-forming conditions.

[0077] The integrated converter and booster of the present invention adopts a straight-line layout, with the grid converters arranged side by side close to the box body. The tight arrangement avoids space waste and effectively reduces the size of the integrated converter and booster.

[0078] At the same time, the maintainability of the converter and booster is taken into consideration. In order to facilitate the maintenance of different equipment, maintenance doors are designed on the box and on the high-voltage equipment, composite switches, and transformers. At the same time, safety net doors are set to ensure maintainability while improving safety. The low-voltage side busbar is arranged outside the box and adopts a double-layer shell. The outer shell has load-bearing capacity and can be stepped on. The upper part of the inner shell is sealed to prevent water leakage. Air outlets are designed on the sides and bottom to ensure waterproofness while having heat dissipation capabilities.

[0079] In summary, the present invention solves the problems in the prior art of unbalanced supply and demand of new energy, unstable power grid, lack of support for short-term power grid failures, large footprint of energy storage equipment, and easy damage to equipment due to long-distance transportation and bumpy roads.

[0080] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A compact integrated converter and booster for networking, characterized by: The invention comprises a base frame unit (1) and a box cover heat insulation unit (3), as well as a box body (2) integrated on the base frame unit (1), a high-voltage switch isolation assembly (4), a transformer assembly (5), a communication control cabinet (6) and a grid-type converter (8). The box (2) and the grid-type converter (8) are arranged side by side on the base frame unit (1), and the grid-type converter (8) is arranged outside the box (2). The box cover heat insulation unit (3) is arranged at the top opening of the box (2). The high-voltage switch isolation assembly (4), the transformer assembly (5) and the communication control cabinet (6) are all arranged inside the box (2). The box (2) is provided with a heat dissipation assembly for dissipating heat inside the box to realize heat dissipation and air cooling circulation. The outgoing line side of the high-voltage switch isolation assembly (4) is electrically connected to the high-voltage side of the transformer assembly (5), and the low-voltage side of the transformer assembly (5) is electrically connected to the meshing converter (8). The high-voltage switch isolation assembly (4), the transformer assembly (5), and the meshing converter (8) are respectively connected to corresponding control communication sampling port cables of the communication control cabinet (6).

2. The network-building compact converter and booster according to claim 1, characterized in that: The base frame unit (1) is an integrated steel structure frame. An air inlet is provided on the base frame unit (1) and at the bottom of the box body (2). An air inlet mesh assembly (101) is provided at the air inlet for preventing foreign matter from entering the interior of the box body (2).

3. The network-building compact converter and booster according to claim 1, characterized in that: The box (2) is provided with a high-voltage room, a low-voltage room and a communication room which are independent of each other. The transformer assembly (5) includes a main transformer (501) for high-low voltage conversion and an auxiliary transformer (502) for meeting the power demand of internal equipment. The high-voltage switch isolation assembly (4) and the main transformer (501) are both provided in the high-voltage room, the auxiliary transformer (502) is provided in the low-voltage room, and the communication control cabinet (6) is provided in the communication room. The outgoing line side of the high-voltage switch isolation assembly (4) is electrically connected to the high-voltage side of the main transformer (501), and the low-voltage side of the main transformer (501) is electrically connected to the grid-type converter (8) and the auxiliary transformer (502) at the same time.

4. The network-building compact converter and booster according to claim 3, characterized in that: The outgoing line side of the high-voltage switch isolation assembly (4) is electrically connected to the high-voltage side of the main transformer (501) via a high-voltage copper busbar (503), and the low-voltage side of the main transformer (501) is electrically connected to the grid-type converter (8) via a low-voltage copper busbar (504). At the same time, the low-voltage side of the main transformer (501) is also connected to the auxiliary transformer (502) via a cable.

5. The network-building compact converter and booster according to claim 1, characterized in that: The base frame unit (1) is also provided with a raised seat assembly (7) for supporting the converter and ensuring random vibration safety, and the meshed converter (8) is mounted on the raised seat assembly (7).

6. The network-building compact converter and booster according to claim 5, characterized in that: The raised seat assembly (7) comprises a raised base welded into a frame-type structure, wherein the internal interlayer of the raised base integrates a busbar bridge (701), a busbar (702) and a branch copper busbar (703); the AC side of the grid-type converter (8) is connected to the busbar (702) provided in the busbar bridge (701) via the branch copper busbar (703); the DC side is connected to the energy storage battery pack via a cable; and the low-voltage side of the transformer assembly (5) is connected to the busbar (702) via a low-voltage copper busbar (504).

7. The network-building compact converter and booster according to claim 6, characterized in that: The elevated base is also provided with a busbar bridge cover plate (705) which is sealed and waterproof, and the busbar bridge cover plate (705) is located outside the busbar bridge (701). The bottom plate of the busbar bridge (701) is provided with a first heat dissipation duct (704) for ensuring heat dissipation and ventilation of the busbar.

8. The network-building compact converter and booster according to claim 1, characterized in that: The heat dissipation assembly comprises a plurality of heat dissipation fans (201) and air inlet louvers (205) arranged on both sides of the box (2); a plurality of separately arranged heat dissipation fans (201) are arranged on the box (2) and close to the top thereof; a second heat dissipation duct (202) is arranged at the outlet of the heat dissipation fan (201) for guiding the direction of hot air and preventing the hot air from flowing back into the box (2); a plurality of waterproof and dustproof air inlet louvers (205) are provided on the side wall of the box (2); external cold air enters the box (2) through the air inlet of the base frame unit (1) and the air inlet louvers (205) on the side wall of the box (2), flows through the transformer assembly (5) to dissipate heat, and after the hot air rises, it is guided away from the outside of the box (2) under the action of the heat dissipation fan (201) and through the heat dissipation duct (202), completing a heat dissipation cycle.

9. The network-building compact converter and booster according to claim 3, characterized in that: Two first inspection doors (2031) are provided on the side wall of the box body (2) for inspecting the high-voltage switch isolation assembly (4); two second inspection doors (2032) are provided on the side wall of the box body (2) for inspecting the main transformer (501); a third inspection door (2033) is provided on the side wall of the box body (2) for inspecting the auxiliary transformer (502); a fourth inspection door (2034) is provided on the side wall of the box body (2) for inspecting the communication control cabinet (6); and a safety net door (204) is provided on the inner side of each of the first inspection door (2031) and the second inspection door (2032).

10. The network-building compact converter and booster according to claim 1, characterized in that: The box cover heat insulation unit (3) comprises a box cover body, the box cover body comprises a box cover keel (301) with a hollow structure, the top of the box cover keel (301) is paved with a waterproof top plate (302), and the bottom is paved with a heat insulation board (303); the box cover body is provided with a mounting groove nested with the box body (2) to form a waterproof structure, and at the same time, screws provided on the periphery of the box cover body are docked with preset screw holes of the box body (2) to form a detachable screw connection, and the box cover body is also integrated with lighting and fire detection components and hoisting ears (304) for convenient hoisting.

11. The network-building compact converter and booster according to claim 1, characterized in that: The high-voltage switch isolation assembly (4) comprises a support frame (406) and a combination switch, wherein the support frame (406) is fixed inside the box (2), and the combination switch is suspended on the support frame (406). The combination switch comprises an incoming copper busbar (401), an isolating switch (402), a vacuum circuit breaker (403), an earthing switch (404) and a current transformer (405). The incoming copper busbar (401) is connected to the static contact of the isolating switch (402), the moving contact of the isolating switch (402) is connected to the static contact of the vacuum circuit breaker (403), the moving contact of the vacuum circuit breaker (403) is connected to the incoming terminal P1 of the current transformer (405), the outgoing terminal P2 of the current transformer (405) is connected to the static contact of the earthing switch (404), and the static contact of the earthing switch (404) is connected in parallel with the high-voltage copper busbar (503) on the high-voltage side of the transformer assembly (5). The support frame (406) is further provided with a lightning arrester (407) connected to the incoming copper busbar (401).

12. The network-building compact converter and booster according to claim 1, characterized in that: The upper layer of the base frame unit (1) is provided with a load-bearing steel plate with no deformation of the footrest. A cable trough box (105) for arranging the secondary circuit cables is provided in the interlayer of the base frame unit (1) and below the communication cabinet (6). The base frame unit (1) is provided with a plurality of hoisting rods (106) on both sides in the length direction, which are used to bear the dead weight of the whole machine during transportation and hoisting. The base frame unit (1) is provided with inlet and outlet holes and cable clamps (103), a maintenance manhole (102), and a grounding terminal block (107) for grounding the grid-type converter (8) below the grid-type converter (8). The base frame unit (1) is also provided with a grounding copper bus (104) connected to the high-voltage switch isolation assembly (4).

13. The network-building compact converter and booster according to claim 9, characterized in that: The box (2) is provided with a live display for monitoring high voltage signals, and the safety net door is provided with an electromagnetic lock and a travel switch. The live display, the electromagnetic lock and the travel switch form an electrical interlock, and the auxiliary contacts of the live display are also connected to the power supply circuit of the electromagnetic lock, and the auxiliary contacts of the travel switch are connected to the corresponding connection ends of the high-voltage switch isolation component (4).

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