Connecting structure between outgoing line and tower drum of wind driven generator

Abstract

The utility model relates to a connecting structure between an outgoing line and a tower drum of a wind driven generator, the generator is arranged in a cabin, and the connecting structure comprises a first collecting ring, a second collecting ring and a third collecting ring which are sleeved in sequence; a first carbon brush is arranged on the first collecting ring in a sliding manner and is connected with a first flexible wire; a second carbon brush is arranged on the second collecting ring in a sliding manner and is connected with a second flexible wire; a third carbon brush is arranged on the third collecting ring in a sliding manner and is connected with a third flexible wire; the first flexible wire, the second flexible wire and the third flexible wire are electrically connected with a three-phase wire interface of a generator respectively, and the first collecting ring, the second collecting ring and the third collecting ring are correspondingly and electrically connected with three-phase wires in a primary cable in a tower drum respectively. According to the utility model, the cable connected between the tower drum and the cabin can be prevented from being twisted when a unit finds wind, the use safety is improved, the service life of the cable is prolonged, and the loss of generating capacity cannot be caused.

Description

Technical Field

[0001] The utility model relates to the field of wind turbines, in particular to a connection structure between an outlet line of a wind turbine and a tower. Background Art

[0002] With the increasing shortage of non-renewable energy, the rapid climate change, and the deteriorating environment, wind energy, as a renewable, green and environmentally friendly energy, is being used more and more widely. Using wind energy to generate electricity is one of the ways to utilize wind energy, and thus wind turbines are used. The wind turbine includes a nacelle, blades and a tower. The generator is located in the nacelle, and the connection between the generator and the tower is mainly primary cable, secondary cable and optical cable. The primary cable is mainly used to send the current generated by the wind turbine to the transformer at the bottom of the tower. The secondary cable and optical cable are mainly used to transmit the monitoring signal, alarm signal and control signal in the wind turbine nacelle.

[0003] In actual use, wind turbines (referred to as wind turbines) need to find the wind and operate in the direction of the wind at 360 degrees. However, wind turbines may encounter sudden changes in wind direction during operation. At this time, the wind turbine cabin will yaw, and the cables connected to the cabin (primary cables, secondary cables and optical cables) will also twist accordingly. This process is called twisting (cable winding). When the wind turbine rotates continuously in one direction, the wind turbine needs to untwist the twisted cables. The number of twists is read by the cable sensor and fed back to the wind power yaw control system. The control system manipulates the untwisting device to make the cabin deflect in the opposite direction by the same number of turns, and the cable returns to the normal connection state. This process is called untwisting. Untwisting is to first disconnect the wind turbine from the power grid so that the wind turbine stops transmitting electricity to the power grid; then, the disconnected cables need to be processed, including insulation inspection and waterproofing of the cables to ensure the safety of the cables; finally, the wind turbine needs to be inspected and maintained after untwisting to ensure its normal operation.

[0004] The twisted cable is often in a torsion state, which is prone to serious wear between cables and wear between the twisted cable and the mechanical clamp (to limit the shaking of the twisted cable); when the wind turbine is running at high power, the twisted cable current is large. If the twisted cables are twisted together, the cables are prone to overheating and aging, which poses a safety hazard; unwinding requires the wind turbine to be disconnected from the power grid, affecting the economic benefits of the wind turbine. The existing wind turbine twist prevention and unwinding strategies cannot avoid the wear and overheating of the cables between the wind turbine and the tower, nor can they avoid the loss of power generation caused by disconnection from the power grid during the unwinding of the wind turbine. This connection structure between the wind turbine output line and the tower is designed to solve the above problems. Utility Model Content

[0005] The utility model provides a connection structure between an outlet line of a wind turbine generator and a tower, which can avoid twisting of cables connected between the tower and the cabin when the unit is looking for wind, thereby increasing the safety of use and the service life of the cables and will not cause loss of power generation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cable connection structure between an outlet line of a generator in a wind turbine and a tower, wherein the generator is arranged in a nacelle and comprises a first collector ring, a second collector ring and a third collector ring which are arranged in sequence;

[0008] A first carbon brush is slidably disposed on the first collector ring, and the first carbon brush is connected to a first flexible wire;

[0009] A second carbon brush is slidably provided on the second collector ring, and the second carbon brush is connected to a second flexible wire;

[0010] A third carbon brush is slidably provided on the third collector ring, and the third carbon brush is connected to a third soft wire;

[0011] The first flexible electrical wire, the second flexible electrical wire and the third flexible electrical wire are respectively electrically connected to the three-phase line interface of the generator, and the first collector ring, the second collector ring and the third collector ring are respectively electrically connected to the three-phase lines in the primary cable in the tower.

[0012] Preferably, the first flexible electrical wire, the second flexible electrical wire and the third flexible electrical wire each include a steel core, a copper wire layer and an insulating skin layer arranged from the inside to the outside.

[0013] Preferably, the first collector ring, the second collector ring and the third collector ring are all connected to the upper part of the tower through insulating support columns.

[0014] Preferably, the connection structure further includes a receiving module and a merging module for collecting monitoring signals, alarm signals and control signals in the cabin, the receiving module is arranged in the tower, the merging module is arranged in the cabin, and the merging module and the receiving module are wirelessly connected.

[0015] Preferably, the merging module and the receiving module adopt ZigBee / Wifi mode for transmission.

[0016] Preferably, it further comprises a support assembly capable of preventing a secondary cable transmitting an emergency stop signal from being twisted, the support assembly comprising a first support member and a second support member, the first support member being fixedly disposed in the tower, and the second support member being fixedly disposed in the cabin;

[0017] The secondary cable in the tower for transmitting the emergency stop signal passes through the first support member and the second support member in sequence and is electrically connected to the control device in the cabin. The secondary cable can rotate relative to the first support member and the second support member.

[0018] Preferably, the first support member and the second support member are both bearings.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The electrical connection between the primary cable and the three-phase interface of the generator is replaced by a combination of carbon brushes and soft wires. When the cabin is finding wind, the cabin rotates and the soft wire drives the carbon brush to slide on the collector ring, thereby directly avoiding twisting of the primary cable connected to the generator. There is no need to untie the cable, and the primary cable will not be disconnected from the grid due to untie, causing loss of power generation. Moreover, since twisting and untie can be avoided, it is safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is an overall schematic diagram of the connection structure of an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the connection structure of the collector ring, the flexible wire and the carbon brush in the embodiment of the utility model;

[0024] Figure 3 This is a cross-sectional view of a flexible wire according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Cabin; 2. Generator; 3. First collector ring; 4. Second collector ring; 5. Third collector ring; 6. First carbon brush; 7. Second carbon brush; 8. Third carbon brush; 9. First flexible wire; 91. Steel core; 92. Copper wire layer; 93. Insulation layer; 10. Second flexible wire; 11. Third flexible wire; 14. Primary cable; 15. Merging module; 16. Receiving module; 17. Optical fiber; 18. First support member; 19. Second support member; 20. Secondary cable; 21. Tower. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] During actual use, the wind turbine nacelle needs to rotate 360 ​​degrees to find the wind, and the blades need to run against the wind to maximize power generation. However, the wind turbine may encounter a sudden change in wind direction during operation. At this time, the wind turbine nacelle will yaw, and the cables connected to the nacelle (primary cables, secondary cables and optical cables) will also twist accordingly. This process is called twisting (cable winding). After twisting, the cables need to be unwound, but the existing unwinding strategy cannot avoid the wear and overheating of the cables between the wind turbine and the tower. It also cannot avoid the loss of power generation caused by disconnection from the power grid during the unwinding of the wind turbine.

[0031] like Figure 1-3As shown, the embodiment of the utility model provides a connection structure between the outlet line of a wind turbine generator and the tower, which is used for power transmission and signal transmission between the tower 20 and the generator 2, so as to avoid twisting of the nacelle 1 when the nacelle 1 rotates to find the wind, thereby avoiding untwisting and not causing the loss of power generation of the wind turbine 2. Specifically, the generator 2 is installed in the nacelle 1, and the connection structure includes a first collector ring 3, a second collector ring 4 and a third collector ring 5 which are sequentially sleeved, and the diameters of the first collector ring 3, the second collector ring 4 and the third collector ring 5 are arranged in sequence from small to large. The first collector ring 3, the second collector ring 4 and the third collector ring 5 are horizontally arranged and connected to the upper part of the tower 20 through an insulating support column. A first carbon brush 6 is slidably provided on the first collector ring 3, and a first soft wire 9 is connected to the first carbon brush 6. A second carbon brush 7 is slidably provided on the second collector ring 4, and the second carbon brush 7 is connected to a second soft wire 10. A third carbon brush 8 is slidably provided on the third collector ring 5, and the third carbon brush 8 is connected to a third soft wire 11. The first soft wire 9, the second soft wire 10 and the third soft wire 11 are electrically connected to the three-phase line interface of the generator 2 respectively, and the first collector ring 3, the second collector ring 4 and the third collector ring 5 are electrically connected to the three-phase line in the primary cable 14 in the tower 20 respectively, so that the first collector ring 3, the second collector ring 4 and the third collector ring 5 are used as a transfer structure to supply the three-phase electricity generated by the generator 2 to the tower 20, and the primary cable 14 is replaced by a combination of carbon brushes and soft wires to be electrically connected to the three-phase interface of the generator 2. When the cabin 1 is in the process of finding wind, the cabin 1 rotates, and the soft wire drives the carbon brush to slide on the collector ring, thereby directly avoiding the twisting of the primary cable 14 connected to the generator 2, so that there is no need to untie it, and it will not be disconnected from the power grid due to untie, causing loss of power generation; and even if the soft wire has a small twist in this process, but compared with the primary cable 14, the soft wire only supplies one phase, the wire is thinner, and the wire is soft, and the small twist of the soft wire will not cause wear and overheating of the cable.

[0032] Specifically, the first flexible electrical wire 9, the second flexible electrical wire 10 and the third flexible electrical wire 11 have the same structure, and all include a steel core 91, a copper wire layer 92 and an insulating layer 93 arranged from the inside to the outside, wherein the steel core 91 ensures the connection strength of the electrical wire to a certain extent, the copper wire layer 92 acts as a current carrier and plays a role in conducting current, the insulating layer 93 is coated on the outer side of the copper wire layer 92 and plays an insulating role, and the insulating layer 93 in this embodiment is the same as the insulating layer 93 of the primary cable 14, and the strength of the copper wire is very small, and the ratio of the radius of the steel core 91 to the radius of the copper wire layer 92 is 1:5, thereby ensuring the strength of the flexible electrical wire without making its strength very large.

[0033] Specifically, the connection structure also includes a receiving module 16 and a merging module 15 for collecting monitoring signals, alarm signals and control signals in the cabin 1. The receiving module 16 is arranged in the tower 20, and the receiving module is connected to the main station outside the tower 20 through a secondary cable 19 and / or an optical cable. The merging module 15 is arranged in the cabin 1 and is also connected to the control device of the generator 2 in the cabin 1 through the secondary cable 19 and / or the optical cable. Accordingly, the merging module 15 and the receiving module 16 are wirelessly connected, so that the secondary cable 19 and / or the optical cable that was originally used to transmit monitoring signals, alarm signals and control signals and needs to pass through the connection between the cabin 1 and the tower 20 is now replaced by the merging module 15 and the receiving module 16 to transmit signals, and the connection between the cabin 1 and the tower 20 is no longer equipped with a signal for transmitting monitoring signals, alarm signals and The secondary cable 19 and / or optical cable of the control signal, so the cabin 1 will not cause the twisting of the secondary cable 19 and / or optical cable during the rotation to find the wind. Specifically, the ZigBee / Wifi mode can be used to transmit signals between the merging module 15 and the receiving module 16, wherein the wireless communication method mainly adopts the ZigBee method, and the Wifi method is a backup method. When a communication failure occurs in the ZigBee method, it automatically switches to the Wifi method; specifically, the merging module 15 synchronously converts all signals into digital signals, puts a time mark on the message to ensure that all signals are in the same time section, and then wirelessly transmits them to the receiving module. The existing technology can be made using existing chips, and the receiving module 16 is only used to receive signals, and then communicates with the secondary cable 19 and / or optical cable, and can also be made using existing chips.

[0034] In order to ensure that the two wind turbine generators can be shut down reliably under extreme abnormal conditions, it is necessary to set a separate connection method for the emergency stop signal, and it is necessary to use a secondary cable 19 to transmit the signal. In order to avoid the secondary cable 19 transmitting the emergency stop signal from twisting, a support assembly is used to support the secondary cable 19, wherein the support assembly includes a first support member 17 and a second support member 18, the first support member 17 is fixed in the tower 20, and the second support member 18 is fixed to the nacelle 1. The secondary cable 19 for transmitting the emergency stop signal passes through the first support member 17 and the second support member 18 in sequence and is connected to the control device in the nacelle 1. After installation, the secondary cable 19 can rotate relative to the first support member 17 and the second support member 18, so that the secondary cable 19 can rotate itself as the nacelle 1 rotates, avoiding the twisting problem caused by the existing secondary cable 19 being fixed, and the first support member 17 and the second support member 18 can both be bearings. When fixed, the secondary cable 19 passes through the two bearings in sequence, which not only constrains the secondary cable 19, but also drives the inner ring of the bearing to rotate together to avoid twisting.

[0035] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A connection structure between an outlet line of a wind turbine generator and a tower, wherein the generator is arranged in a nacelle, characterized in that: It includes a first collector ring, a second collector ring and a third collector ring which are sleeved in sequence; A first carbon brush is slidably disposed on the first collector ring, and the first carbon brush is connected to a first flexible wire; A second carbon brush is slidably disposed on the second collector ring, and the second carbon brush is connected to a second flexible wire; A third carbon brush is slidably disposed on the third collector ring, and the third carbon brush is connected to a third soft wire; The first flexible electrical wire, the second flexible electrical wire and the third flexible electrical wire are respectively electrically connected to the three-phase line interface of the generator, and the first slip ring, the second slip ring and the third slip ring are respectively electrically connected to the three-phase lines in the primary cable in the tower.

2. The connection structure according to claim 1, characterized in that: The first flexible electrical wire, the second flexible electrical wire and the third flexible electrical wire each include a steel core, a copper wire layer and an insulating skin layer arranged from inside to outside.

3. The connection structure according to claim 1, characterized in that: The first collector ring, the second collector ring and the third collector ring are all connected to the upper part of the tower through insulating support columns.

4. The connection structure according to claim 1, characterized in that: The connection structure also includes a receiving module and a merging module for collecting monitoring signals, alarm signals and control signals in the cabin. The receiving module is arranged in the tower, and the merging module is arranged in the cabin. The merging module and the receiving module are wirelessly connected.

5. The connection structure according to claim 4, characterized in that: The merging module and the receiving module adopt ZigBee / Wifi mode for transmission.

6. The connection structure according to claim 1, characterized in that: It also includes a support assembly capable of preventing a secondary cable transmitting an emergency stop signal from being twisted, the support assembly including a first support member and a second support member, the first support member being fixedly disposed in the tower, and the second support member being fixedly disposed in the nacelle; The secondary cable in the tower for transmitting the emergency stop signal passes through the first support member and the second support member in sequence and is electrically connected to the control device in the cabin. The secondary cable can rotate relative to the first support member and the second support member.

7. The connection structure according to claim 6, characterized in that: The first support member and the second support member are both bearings.

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