A high voltage grounding reactor for offshore wind power

Abstract

The present invention discloses a high-voltage grounding reactor for offshore wind power, comprising a mounting base and a supporting assembly arranged at the lower end thereof, a mounting cylinder being provided at the upper end of the mounting base, a reactor unit being sleeved on the mounting cylinder, the reactor unit comprising a first winding unit and a second winding unit, the leads of the first winding unit and the second winding unit being connected in series, a safety distance being provided between the second winding unit and the first winding unit, a rotating ring being rotatably provided at the upper end of the mounting cylinder, the present application is designed in view of the drawbacks of the existing devices, and can effectively utilize an unpowered wind ball to accelerate the discharge of heat inside the reactor, effectively improving the heat dissipation effect, and can also utilize high temperature to trigger the expansion of an expansion piece, thereby triggering a spray assembly, and utilizing liquid evaporation to achieve further cooling, effectively improving the heat dissipation effect, and also reducing the size of magnetic leakage, avoiding the burning of the coil caused by local wire overheating, and improving the safety and stability factor of the product.

Description

Technical Field

[0001] The invention relates to the technical field of reactor equipment, in particular to a high-voltage grounding reactor for offshore wind power. Background Art

[0002] With the continuous development of power technology, offshore wind power generation capacity is constantly expanding, especially the effective development and utilization of wind resources in offshore areas is getting farther and farther. The development of offshore wind farms in offshore areas is of great significance to solving the energy crisis. With the increasing aggravation of energy problems and the continuous commissioning of onshore flexible DC transmission and new energy grid-connected projects. Offshore wind power technology is about to usher in a comprehensive outbreak, and a large number of offshore wind power projects will enter the construction stage in the next few years. Grid-connected operation has become the most effective way to utilize wind energy on a large scale. The offshore wind power flexible DC access system based on modular multilevel converters (MMC) is more suitable for long-distance, large-scale offshore wind power access systems.

[0003] Since the offshore MMC converter station must adopt the design of an offshore platform, the area is relatively limited. Therefore, the design process of the offshore flexible direct current transmission system needs to be both intensive, streamlined and highly reliable. Especially for the symmetrical monopole MMC system, the design of the grounding method has a greater impact on the safe operation of offshore wind power. The grounding device of the offshore wind power flexible direct current transmission system includes a reactor group, a disconnector group, and a grounding resistor. Among them, the grounding reactor in the grounding device has a rated current of 0.1-2A, a rated inductance of 100-10000H, and a large resistance value.

[0004] Due to the large inductance of the grounding reactor, the existing grounding point reactor is made of multiple aluminum round wires wrapped in parallel, and the final product is composed of 1-8 coils in parallel. Due to the large number of parallel wires and large radial tolerance, the coil impedance and load loss are highly dispersed, the internal winding of the coil is in a no-load state, and the local leakage magnetic field is too large, which can easily cause the coil to overheat and burn, making the product performance unstable. In addition, a group of products has a large number of coils, a large overall structure, and a large footprint.

[0005] In addition, existing reactors generate a large amount of heat when working. Generally, reactors use heat exchange to cool down, but this heat dissipation method is inefficient and cannot discharge internal heat, which is not conducive to ensuring the service life of the reactor. Based on this, a high-voltage grounding reactor for offshore wind power is now provided. Summary of the invention

[0006] The object of the present invention is to provide a high-voltage grounding reactor for offshore wind power to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-voltage grounding reactor for offshore wind power comprises a mounting base and a supporting assembly arranged at the lower end thereof, a mounting cylinder is provided at the upper end of the mounting base, a reactor unit is sleeved on the mounting cylinder, the reactor unit comprises a first winding unit and a second winding unit, the leads of the first winding unit and the second winding unit are connected in series, a safety distance is provided between the second winding unit and the first winding unit, a rotating ring is rotatably provided at the upper end of the mounting cylinder, a horizontally arranged rotating disk is provided at the upper end of the rotating ring, a non-powered wind ball for rotating by utilizing airflow is fixed on the rotating disk, a second vent for heat dissipation is provided on the rotating disk where the non-powered wind ball is located, a first vent corresponding to the second vent is provided on the mounting base where the mounting cylinder is located, a transmission rod group is vertically provided at the middle position of the lower end of the second vent, and a fan blade for pushing the airflow to move upward is provided on the transmission rod group.

[0009] As a further solution of the present invention: the transmission rod group includes a suspension rod connected and fixed to the bottom of the rotating disk, an expansion piece is provided at the lower end of the suspension rod, and the expansion piece is extended or shortened based on the temperature inside the mounting tube, and an extension rod for installing fan blades is provided at the lower end of the expansion piece, and the extension rod is slidably arranged with a through hole on the mounting seat.

[0010] As a further solution of the present invention: the expansion member includes a first piston cylinder arranged at the lower end of the hanger, an expansion piston plate is slidably fitted inside the first piston cylinder, an expansion filling block based on temperature expansion is filled above the expansion piston plate, and the lower side of the expansion piston plate is connected and fixed to the bottom of the first piston cylinder by a first spring.

[0011] As a further solution of the present invention: heat dissipation fins are distributed on the inner wall of the installation tube.

[0012] As a further solution of the present invention: a spray assembly for spraying water mist to improve the heat dissipation effect is provided below the mounting seat where the first air vent is located, a pressure piece for triggering the spray assembly to realize spraying, the pressure piece is a conical structure with a small lower end and a large upper end, the spray assembly includes at least one second piston cylinder, an extrusion piston block is slidably fitted inside the second piston cylinder, the left side of the extrusion piston block is connected and fixed to the inner wall of the second piston cylinder by a second spring, a push rod is provided at the outer end of the extrusion piston block, a mounting block is provided at the left end of the push rod, an atomizing nozzle for atomizing liquid is provided on the mounting block, a guide channel for connecting the atomizing nozzle with the inner cavity of the second piston cylinder is provided inside the push rod and the extrusion piston block, a discharge one-way valve is provided in the guide channel, the water inlet end of the second piston cylinder is connected to a storage box for storing liquid through a pumping pipe, and the pumping pipe is also provided with a water suction one-way valve.

[0013] As a further solution of the present invention: a plurality of the second piston cylinders may be provided and distributed in an array outside the mounting cylinder; the storage box is an annular structure and is fixed outside the supporting assembly.

[0014] As a further solution of the present invention: a pressing wheel is rotatably provided on the mounting block.

[0015] As a further solution of the present invention: the first winding unit and the second winding unit are spirally wound with multi-strand enameled copper wires with extremely small wire gauges, and each layer of coils is connected in series. Before winding the first layer of wire, two layers of impregnated glass wire and a layer of non-woven fabric are wound on the wire mold. After the first layer of wire is wound, a layer of impregnated glass wire and two layers of non-woven fabric are wound outside the coil, and the tail end is fixed with double-sided tape, and then a transition is made to the second layer. The transition position is padded with thick insulating cloth, and the winding of subsequent layers refers to the winding of the first layer of wire. After the winding of the coil on the first winding unit is completed, the lead wire is cut off, and then the mounting tube is turned over to start winding the coil on the second winding unit. The winding method of the coil on the second winding unit is consistent with the coil on the first winding unit. A safety insulation distance of 10-200mm is reserved between the first section coil and the second section coil. After the winding of the lower half coil is completed, the lead wire is cut off, and the reserved leads of the upper and lower coils are welded and connected.

[0016] As a further solution of the present invention: the support assembly includes a plurality of legs distributed in an array, and a support base for connecting and fixing to the ground is provided at the lower end of each leg.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present application is designed to address the drawbacks of existing devices, and can effectively utilize the unpowered wind ball to accelerate the discharge of heat inside the reactor, effectively improving the heat dissipation effect. The high temperature can also be used to trigger the expansion of the expansion member, thereby triggering the spray assembly, and further cooling is achieved by utilizing liquid evaporation, effectively improving the heat dissipation effect and ensuring the service life of the equipment.

[0019] The present invention adopts the method of connecting the layers of encapsulated wires in series, transferring the radial turns to the axial direction, reducing the number of wires, reducing the outer diameter of the encapsulation, reducing the leakage magnetic field, avoiding the burning of the coil caused by the overheating of the local wires, and improving the safety and stability coefficient of the product;

[0020] The present invention adopts the method of winding the coil axially in two sections, which reduces the outer diameter of the coil, increases the coil height, improves the product inductance, reduces the inter-segment voltage and internal field strength, and reduces the distance between segments while ensuring the product inductance parameters, so that the entire product is smaller as a whole, and reduces the original product of 1-8 coils in parallel to 1-4 stacked coils in parallel, saving costs and floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the pressing member in the present invention.

[0024] Figure 4 It is a schematic diagram of the coil winding structure in the present invention.

[0025] Figure 5 It is a partial enlarged view of the structure of the present invention.

[0026] Among them: mounting seat 11, first air vent 12, water suction pipe 13, storage box 14, spray assembly 15, pressure piece 16, support seat 17, support leg 18, extension rod 19, first spring 20, expansion piston plate 21, expansion filling block 22, first piston cylinder 23, unpowered wind ball 24, second air vent 25, rotating disk 26, rotating ring 27, mounting cylinder 28, first winding unit 29, second winding unit 30, atomizing nozzle 31, push rod 32, second spring 33, second piston cylinder 34, extrusion piston block 35, mounting block 36, pressure wheel 37. DETAILED DESCRIPTION

[0027] Example 1

[0028] See also Figure 1-Figure 5In an embodiment of the present invention, a high-voltage grounding reactor for offshore wind power includes a mounting seat 11 and a support assembly arranged at the lower end thereof, a mounting cylinder 28 is provided at the upper end of the mounting seat 11, a reactance unit is sleeved on the mounting cylinder 28, the reactance unit includes a first winding unit 29 and a second winding unit 30, the leads of the first winding unit 29 and the second winding unit 30 are connected in series, a safety distance is provided between the second winding unit 30 and the first winding unit 29, a rotating ring 27 is rotatably provided at the upper end of the mounting cylinder 28, a horizontally arranged rotating disk 26 is provided at the upper end of the rotating ring 27, a non-powered wind ball 2 for rotating by utilizing airflow is fixed on the rotating disk 26 4. A second vent 25 for heat dissipation is provided on the rotating disk 26 where the unpowered wind ball 24 is located, and a first vent 12 corresponding to the second vent 25 is provided on the mounting seat 11 where the mounting tube 28 is located. A transmission rod group is vertically provided at the middle position of the lower end of the second vent 25, and a fan blade for pushing the airflow upward is provided on the transmission rod group. In this way, under the action of the airflow, the unpowered wind ball 24 will drive the rotating disk 26 to rotate, and the rotating disk 26 will drive the transmission rod group to rotate, and the transmission rod group drives the fan blade to rotate. Combined with the action of centrifugal force, the hot air in the mounting tube 28 will be taken out, and the cold airflow enters along the first vent 12, thereby effectively cooling the inside of the mounting tube 28;

[0029] The transmission rod group includes a suspension rod connected and fixed to the bottom of the rotating disk 26, an expansion member is provided at the lower end of the suspension rod, and the expansion member is extended or shortened based on the temperature inside the mounting tube 28, and an extension rod 19 for mounting the fan blade is provided at the lower end of the expansion member, and the extension rod 19 is slidably arranged with the perforation on the mounting seat 11;

[0030] The expansion member includes a first piston cylinder 23 arranged at the lower end of the suspension rod, an expansion piston plate 21 is slidably matched inside the first piston cylinder 23, an expansion filling block 22 based on temperature expansion is filled above the expansion piston plate 21, and the lower side of the expansion piston plate 21 is connected and fixed to the bottom of the first piston cylinder 23 through a first spring 20. The expansion filling block 22 here will expand to different degrees at different temperatures inside the mounting cylinder 28.

[0031] In order to improve the heat dissipation effect of the installation tube 28, heat dissipation fins are distributed on the inner wall of the installation tube 28;

[0032] Figure 5As shown, a spray assembly 15 for spraying water mist to improve the heat dissipation effect is provided below the mounting seat 11 where the first vent 12 is located, and a pressure piece 16 for triggering the spray assembly 15 to achieve spraying is provided at the lower end of the transmission rod group, and the pressure piece 16 is a conical structure with a small lower end and a large upper end. The spray assembly 15 includes at least one second piston cylinder 34, and an extrusion piston block 35 is slidably matched inside the second piston cylinder 34. The left side of the extrusion piston block 35 is connected and fixed to the inner wall of the second piston cylinder 34 by a second spring 33. A push rod 32 is provided at the outer end of the extrusion piston block 35, and a mounting block 36 is provided at the left end of the push rod 32. An atomizing nozzle 31 for atomizing liquid is provided on the mounting block 36, and the push rod 3 2 and the extrusion piston block 35 are provided with a guide channel for connecting the atomizing nozzle 31 and the inner cavity of the second piston cylinder 34, and a discharge check valve is provided in the guide channel. The water inlet end of the second piston cylinder 34 is connected to the storage box 14 for storing liquid through the pumping pipe 13, and the pumping pipe 13 is also provided with a water absorption check valve, so that when the transmission rod group rotates, the pressing piece 16 will also rotate, and the convex structure on the outer side of the pressing piece 16 will generate a driving force on the mounting block 36, so that the extrusion piston block 35 compresses the liquid, and the liquid will flow along the guide channel and finally be sprayed out from the position of the atomizing nozzle 31. The sprayed mist will enter the interior of the mounting cylinder 28, and when the mist droplets evaporate, they will further absorb a large amount of heat from the inner wall of the mounting cylinder 28, thereby effectively improving the heat dissipation effect;

[0033] It should be noted that the operation of the extrusion piston block 35 is conditional. Only when the temperature inside the installation cylinder 28 is higher than the set value, the expansion filling block 22 will expand, thereby causing the pressing member 16 located below to extend downward until it contacts the spray assembly 15.

[0034] Here, a plurality of second piston cylinders 34 may be provided, and the array is distributed outside the mounting cylinder 28. The storage box 14 is an annular structure and is fixed outside the supporting assembly;

[0035] In order to make the action between the pressing member 16 and the spray assembly 15 smoother, a pressing wheel 37 is rotatably provided on the mounting block 36, so that when the outer protruding structure of the pressing member 16 contacts the pressing wheel 37, it will be smoother;

[0036] Figure 1 and Figure 4As shown, the first winding unit 29 and the second winding unit 30 here are spirally wound with multiple strands of enameled copper wire with extremely small wire gauge, and each layer of coil is connected in series. Before winding the first layer of wire, two layers of impregnated glass yarn and one layer of non-woven fabric are wound on the wire mold. After the first layer of wire is wound, a layer of impregnated glass yarn and two layers of non-woven fabric are wound outside the coil, and the tail end is fixed with double-sided tape, and then transition is made to the second layer. The transition position is padded with thick insulating cloth. The winding of subsequent layers refers to the winding of the first layer of wire. The first winding unit 29 After the upper coil is wound, the lead wire is cut off, and then the mounting cylinder 36 is turned over to start winding the coil on the second winding unit 30. The winding method of the coil on the second winding unit 30 is consistent with the coil on the first winding unit 29. A 10-200mm safety insulation distance is reserved between the first section coil and the second section coil. After the lower half coil is wound, the lead wire is cut off. The reserved lead wires of the upper and lower coils are welded at point A. During welding, it is necessary to ensure that the lead wires are firmly welded without cold welding. After the coil is welded, it is cured;

[0037] The present invention adopts the method of connecting the layers of encapsulated wires in series, transferring the radial turns to the axial direction, reducing the number of wires, reducing the outer diameter of the encapsulation, reducing the leakage magnetic field, avoiding the burning of the coil caused by the overheating of the local wires, and improving the safety and stability coefficient of the product;

[0038] The present invention adopts the method of winding the coil axially in two sections, which reduces the outer diameter of the coil, increases the coil height, improves the product inductance, reduces the inter-segment voltage and internal field strength, reduces the inter-segment distance, and makes the whole product smaller, reduces the original product 1-8 coils in parallel to 1-4 stacked coils in parallel, saves cost and floor space;

[0039] The support assembly includes a plurality of legs 18 distributed in an array, and a support base 17 for connecting and fixing to the ground is provided at the lower end of each leg 18, so as to provide a stable foundation for the mounting base 11.

[0040] In summary: in terms of heat dissipation, under the action of airflow, the unpowered wind ball 24 will drive the rotating disk 26 to rotate, the rotating disk 26 will drive the transmission rod group to rotate, and the transmission rod group will drive the fan blades to rotate, and then with the action of centrifugal force, the hot air in the installation cylinder 28 will be brought out, and the cold air flow will enter along the first vent 12, thereby effectively cooling the inside of the installation cylinder 28. When the internal temperature of the installation cylinder 28 reaches a predetermined value, the expansion member will drive the pressure member 16 to extend downward, so that the pressure member 16 triggers the spray assembly 15, and the convex structure on the outside of the pressure member 16 will generate a driving force on the installation block 36, thereby squeezing The piston block 35 compresses the liquid, and the liquid will flow along the guide channel and finally be sprayed out from the atomizing nozzle 31. The sprayed mist will enter the interior of the mounting tube 28. When the mist droplets evaporate, they will further absorb a large amount of heat from the inner wall of the mounting tube 28, thereby effectively improving the heat dissipation effect. In addition, the present application optimizes the winding method of the coil to solve the shortcomings of the existing products that are large in size and occupy a large area, and optimizes the existing 1-8 coils to 1-4 stacked coils, which are stacked in pairs, greatly saving the floor space, and solving the problems of large inductance, a large number of coil wires in parallel, magnetic leakage, and easy burning of the coil in the existing products.

Claims

1. A high-voltage grounding reactor for offshore wind power, comprising a mounting seat (11) and a support assembly arranged at the lower end thereof, wherein a mounting tube (28) is arranged at the upper end of the mounting seat (11), characterized in that: The mounting tube (28) is sleeved with an inductance unit, the inductance unit comprising a first winding unit (29) and a second winding unit (30), the leads of the first winding unit (29) and the second winding unit (30) being connected in series, a safety distance being provided between the second winding unit (30) and the first winding unit (29), a rotating ring (27) being rotatably provided at the upper end of the mounting tube (28), a horizontally arranged rotating disk (26) being provided at the upper end of the rotating ring (27), a non-powered wind ball (24) for utilizing airflow to rotate being fixed on the rotating disk (26), a second vent (25) for heat dissipation being provided on the rotating disk (26) where the non-powered wind ball (24) is located, a first vent (12) corresponding to the second vent (25) being provided on the mounting seat (11) where the mounting tube (28) is located, a transmission rod group being vertically provided at the middle position of the lower end of the second vent (25), the transmission rod group being provided with a fan blade for pushing the airflow to move upward; The transmission rod group comprises a suspension rod connected and fixed to the bottom of the rotating disk (26); an expansion member is provided at the lower end of the suspension rod, and the expansion member is extended or shortened based on the temperature inside the mounting tube (28); an extension rod (19) for mounting fan blades is provided at the lower end of the expansion member, and the extension rod (19) is slidably arranged with a perforation on the mounting seat (11); The expansion member comprises a first piston cylinder (23) arranged at the lower end of the suspension rod, an expansion piston plate (21) is slidably fitted inside the first piston cylinder (23), an expansion filling block (22) which expands based on temperature is filled above the expansion piston plate (21), and the lower side of the expansion piston plate (21) is connected and fixed to the inner bottom of the first piston cylinder (23) via a first spring (20).

2. The high-voltage grounding reactor for offshore wind power according to claim 1, characterized in that: The inner wall of the installation cylinder (28) is provided with heat dissipation fins.

3. The high-voltage grounding reactor for offshore wind power according to claim 1, characterized in that: A spray assembly (15) for spraying water mist to improve the heat dissipation effect is provided below the mounting seat (11) where the first vent (12) is located. A pressure piece (16) for triggering the spray assembly (15) to achieve spraying is provided at the lower end of the transmission rod assembly. The pressure piece (16) is a conical structure with a small lower end and a large upper end. The spray assembly (15) includes at least one second piston cylinder (34). An extrusion piston block (35) is slidably engaged inside the second piston cylinder (34). The left side of the extrusion piston block (35) is fixedly connected to the inner wall of the second piston cylinder (34) via a second spring (33). A push rod (32) is provided at the outer end of the extrusion piston block (35), a mounting block (36) is provided at the left end of the push rod (32), an atomizing nozzle (31) for atomizing liquid is provided on the mounting block (36), a guide channel for connecting the atomizing nozzle (31) with the inner cavity of the second piston cylinder (34) is provided inside the push rod (32) and the extrusion piston block (35), a discharge check valve is provided in the guide channel, and a water inlet end of the second piston cylinder (34) is connected to a storage box (14) for storing liquid through a water suction pipe (13), and a water suction check valve is also provided on the water suction pipe (13).

4. The high-voltage grounding reactor for offshore wind power according to claim 3, characterized in that: The second piston cylinder (34) may be provided in plurality and distributed in an array outside the mounting cylinder (28); the storage box (14) is an annular structure and is fixed outside the support assembly.

5. The high-voltage grounding reactor for offshore wind power according to claim 3, characterized in that: A pressing wheel (37) is rotatably provided on the mounting block (36).

6. The high-voltage grounding reactor for offshore wind power according to claim 1, characterized in that: The first winding unit (29) and the second winding unit (30) are spirally wound using multiple strands of enameled copper wire. Each layer of coils is connected in series. Before winding the first layer of wire, two layers of impregnated glass yarn and a layer of non-woven fabric are wound on the wire mold. After the first layer of wire is wound, a layer of impregnated glass yarn and two layers of non-woven fabric are wound outside the coil. The tail end is fixed with double-sided tape, and then a transition is made to the second layer. The transition position is padded with thick insulating cloth. The winding of subsequent layers refers to the winding of the first layer of wire. After the winding of the coil on the first winding unit (29) is completed, the lead wire is cut off, and then the mounting cylinder (28) is turned over to start winding the coil on the second winding unit (30). The winding method of the coil on the second winding unit (30) is the same as that of the coil on the first winding unit (29). A safety insulation distance of 10-200 mm is reserved between the first section coil and the second section coil. After the winding of the lower half coil is completed, the lead wire is cut off, and the reserved lead wires of the upper and lower coils are welded and connected.

7. The high-voltage grounding reactor for offshore wind power according to claim 1, characterized in that: The support assembly comprises a plurality of support legs (18) distributed in an array, and a support base (17) for connecting and fixing to the ground is provided at the lower end of each support leg (18).

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