Structure for connecting generator to conductor rail of direct-driven wind generating set

Abstract

The utility model discloses a connection structure from a generator to a conductor rail of a direct-driven wind generating set, and belongs to the technical field of wind power generation, the connection structure comprises a conductive rotor and a conductive stator which are of tubular structures, and three first lead-out copper bars, the conductive rotor comprises three independent first conductive sections, and the conductive rotor is fixedly mounted on the bottom surface of a hydraulic station platform; the two ends of one first leading-out copper bar are electrically connected with one phase of cable in the three-phase cable and the inner side wall of one first conductive section respectively, the conductive stator is fixedly installed on the yaw platform floor and comprises three independent second conductive sections, the inner side wall of each second conductive section is provided with a carbon brush, and the carbon brush is electrically connected with the first leading-out copper bar. The carbon brush on one second conductive section is attached to the outer side wall of one first conductive section, the outer side walls of the second conductive sections are connected with the conductive rail, the length of a cable can be reduced, when the conductive rotor rotates in a yawing mode along with a unit, the conductive stator and the conductive rotor are electrically connected through the carbon brushes, and the situation that the unit is shut down and the cable is unwound is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and particularly relates to a connection structure from a generator of a direct-drive wind turbine generator set to a conductive rail. Background Art

[0002] In a wind turbine generator set, the power transmission from the outgoing line box of the wind generator to the tower barrel conductive rail is usually soft-connected by multiple cables. The cables pass through the outgoing line box of the generator, the generator frame, the yaw platform and then to the cable twisting platform to access the conductive rail. The length of the cables reaches 30 meters, and there is no strong support point in the whole cable path to relieve the tendency of the cables to sag. The phenomenon of cable sag often occurs during operation, which easily leads to defects such as loosening or deformation at the connection of the outgoing line box of the generator.

[0003] During the operation of the wind turbine generator set, there is a yawing action to face the wind, and the cables from the generator to the conductive rail rotate synchronously with the yaw of the unit. The rotation of the cables has an angular limit, so the unit must stop to untwist the cables when the yaw reaches a certain angle, which affects the power generation efficiency of the unit.

[0004] During the operation of the wind turbine generator set, there will be vibrations, and combined with the cable twisting, it causes mutual wear between the cables. After the outer sheath is worn, the internal conductive part is exposed, resulting in faults such as cable discharge, phase-to-phase short circuit, and cable short circuit to ground.

[0005] When the outer sheath of the cable is worn, the cable discharge will accumulate heat, posing a huge fire hazard.

[0006] The length of the cables reaches 30 meters, resulting in difficult and time-consuming replacement after a fault, and relatively high cable spare part costs. Content of the Utility Model

[0007] To solve the problems raised in the above background art, the utility model provides a connection structure from a generator of a direct-drive wind turbine generator set to a conductive rail, so as to solve the problems of cable wear due to the yaw angle limit of the wind turbine generator set, fire hazards in the cable section connecting the generator to the conductive rail, high difficulty in equipment fault maintenance and high maintenance costs.

[0008] To achieve the above object, the utility model provides the following technical solutions:

[0009] A connection structure from a generator of a direct-drive wind turbine generator set to a conductive rail, comprising:

[0010] A conductive rotor; the conductive rotor is a conductive tubular structure, and three first insulating sections are further provided on the conductive rotor. One of the first insulating sections is arranged at the top end of the conductive rotor and fixedly connected to the bottom surface of the floor of the hydraulic station platform, and the other two first insulating sections divide the conductive rotor into three tubular first conductive sections. The axis of the conductive rotor coincides with the rotating shaft of the hydraulic station platform;

[0011] Three first lead copper bars; all three first lead copper bars are arranged in the conductive rotor. The first end of one first lead copper bar passes through the floor of the hydraulic station platform and is connected to one of the three-phase cables of the generator. The second end of one first lead copper bar is electrically connected to the inner side wall of one first conductive section.

[0012] Conductive stator; the conductive stator is a conductive tubular structure. The conductive stator is fixedly installed on the yaw platform floor through an insulating member. The conductive stator is also provided with two second insulating sections, which divide the conductive stator into three tubular second conductive sections on average. At least one carbon brush is provided on the inner side wall of each second conductive section. The carbon brushes on one second conductive section are attached to the outer side wall of one first conductive section, and the outer side walls of the second conductive sections are all connected to the conductive rail.

[0013] Preferably, the connection structure further includes three connecting rows. The first end of one connecting row is connected to the first end of one first lead copper bar, and the second end of one connecting row is connected to one of the three-phase cables of the generator.

[0014] Preferably, the connection structure further includes three second lead copper bars. The first end of one second lead copper bar is electrically connected to the outer side wall of one second conductive section, and the second end of one second lead copper bar is connected to the conductive rail.

[0015] Preferably, the connection structure further includes at least three carbon brush holders. At least one carbon brush holder is installed on the inner side wall of one second conductive section, and one carbon brush is arranged on one carbon brush holder.

[0016] Preferably, the insulating member is a stator bracket. The bottom end of the stator bracket is fixedly connected to the yaw platform floor, and the top end of the stator bracket is fixedly connected to the conductive stator.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] This application adopts a connection structure in which the rotating part and the non-rotating part are separated. The cable length can be reduced to 2 - 3 meters. A carbon brush is used for electrical connection between the conductive rotor and the conductive stator. After the conductive stator is led out, it can be fixedly connected to the conductive rail by copper bars throughout the line. The conductive rail extends to the bottom of the yaw platform. This connection method solves the defect of cable sinking caused by the large self-weight of the long cable. During the working process, the only consumable for normal wear is the carbon brush. The carbon brush is small in volume, easy to carry, low in replacement cost and short in replacement time. There is no cable twisting angle limit when using this application, which avoids cable untwisting of the unit and improves the power generation efficiency. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the specific structure of this application;

[0020] The marks in the figure are:

[0021] 1 - First insulating section; 2 - First conductive section; 3 - First lead copper bar; 4 - Second insulating section; 5 - Hydraulic station platform floor; 6 - Yaw platform floor; 7 - Carbon brush; 8 - Second lead copper bar; 9 - Carbon brush holder; 10 - Stator bracket; 11 - Fixing bolt; 12 - Second conductive section. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1:

[0024] As Figure 1 shown, a connection structure from the generator of a direct-drive wind turbine to a conductive rail includes:

[0025] A conductive rotor; the conductive rotor uses three insulating partitions as the first insulating section 1 and three conductive tubes as the first conductive section 2. The three insulating partitions are arranged in parallel. The two ends of one conductive tube are fixedly connected to the side surfaces of two insulating partitions. The insulating partition at the top of the conductive rotor is connected to the bottom surface of the hydraulic station platform floor 5 through the fixing bolt 11. The axis of the conductive rotor coincides with the rotating shaft of the hydraulic station platform. An additional insulating partition is provided at the bottom end of the conductive rotor;

[0026] Three connecting rows; the connecting rows are of copper bar structure;

[0027] Three first lead copper bars 3; the three first lead copper bars 3 are all arranged in the conductive rotor. The first end of one connecting row is connected to the first end of one first lead copper bar 3. The second end of one connecting row is connected to one phase of the three-phase cable of the generator. The second end of one first lead copper bar 3 is electrically connected to the inner side wall of one conductive tube. The connecting row is used to extend the length of the first lead copper bar 3 to ensure the long-distance connection between the three-phase cable and the first lead copper bar 3;

[0028] A conductive stator; the conductive stator is a conductive tubular structure. The conductive stator is fixedly installed on the yaw platform floor 6 through an insulating member. Two second insulating sections 4 are also provided on the conductive stator. The two second insulating sections 4 divide the conductive stator into three tubular second conductive sections 12 on average. Four carbon brushes 7 are provided on the inner side wall of each second conductive section 12. The carbon brushes 7 on one second conductive section 12 are in contact with the outer side wall of one first conductive section 2. The outer side walls of the second conductive sections 12 are all connected to the conductive rail.

[0029] In this embodiment, the present application adopts a connection structure in which the rotating part and the non-rotating part are separated. The cable length can be reduced to 2 - 3 meters. After the conductive stator 4 is led out, it can be fixedly connected to the conductive rail through the entire line with copper bars. The conductive rail extends to the bottom of the yaw platform. This connection method solves the defect of cable sinking caused by the large self-weight of the long cable. During the working process, the only normal wear and tear consumable is the carbon brush 7. The carbon brush 7 is small in volume, easy to carry, low in replacement cost and short in replacement time. Moreover, when the conductive rotor rotates randomly with the yaw of the unit, the conductive stator 4 and the conductive rotor are electrically connected by the carbon brush 7, there is no cable torsion angle limit, and the unit shutdown for cable untwisting is avoided, thus improving the power generation efficiency.

[0030] Embodiment 2:

[0031] The difference between this embodiment and Embodiment 1 is that, as Figure 1 shown, the connection structure further includes three second lead-out copper bars 8. The first end of one second lead-out copper bar 8 is electrically connected to the outer side wall of one second conductive section 12, the second end of one second lead-out copper bar 8 is connected to the conductive rail, and the conductive rail is connected to the yaw platform cable.

[0032] Embodiment 3:

[0033] The difference between this embodiment and Embodiment 1 is that, as Figure 1 shown, the connection structure further includes twelve carbon brush holders 9. Four carbon brush holders 9 are installed on the inner side wall of one second conductive section 12, and one carbon brush 7 is arranged on one carbon brush holder 9.

[0034] In this embodiment, the carbon brush holder 9 makes the carbon brush 7 always closely adhere to the conductive rotor through a strong spring mechanism. A carbon brush 7 fixing buckle is also installed on each carbon brush holder 9. The lead-out wire of the carbon brush 7 is fixedly connected to the conductive stator 4 by bolts. When the carbon brush 7 wears a certain length, the connection bolt between the lead-out wire of the carbon brush 7 and the copper bar is untied, and the carbon brush 7 is replaced.

[0035] Embodiment 4:

[0036] The difference between this embodiment and Embodiment 1 is that, as Figure 1 shown, the insulating part is the stator support 10. Each stator support 10 includes two sub-supports. The bottom ends of the sub-supports are fixedly connected to the yaw platform floor 6, and the tops of all sub-supports of one stator support 10 are fixedly connected to the conductive stator 4.

[0037] Embodiment 5:

[0038] The difference between this embodiment and Embodiment 2 is that the connection structure is also provided with a protective cover. The conductive stator is arranged inside the protective cover. The protective cover is provided with holes for the lead-out of the second lead-out copper bar 8. The protective cover is made of insulating material to insulate the conductive stator from the outside and prevent accidental contact with the live part.

Claims

1. A direct-drive wind turbine generator generator to conductor rail connection structure, characterized in that: include: Conductive rotor; The conductive rotor is a conductive tubular structure, and is further provided with three first insulating sections (1), wherein one of the first insulating sections (1) is arranged at the top of the conductive rotor and is fixedly connected to the bottom surface of the hydraulic station platform floor (5), and the other two first insulating sections (1) divide the conductive rotor into three tubular first conductive sections (2), and the axis of the conductive rotor coincides with the rotation axis of the hydraulic station platform; Three first lead-out copper bars (3); the three first lead-out copper bars (3) are all arranged in the conductive rotor, a first end of a first lead-out copper bar (3) passes through the hydraulic station platform floor (5) and is connected to one phase cable of the three-phase cable of the generator, and a second end of a first lead-out copper bar (3) is electrically connected to the inner side wall of a first conductive segment (2); A conductive stator; the conductive stator is a conductive tubular structure, and is fixedly mounted on a yaw platform floor (6) via an insulating member. The conductive stator is also provided with two second insulating segments (4), and the two second insulating segments (4) divide the conductive stator into three tubular second conductive segments (12). The inner wall of each second conductive segment (12) is provided with at least one carbon brush (7), and the carbon brush (7) on a second conductive segment (12) is attached to the outer wall of a first conductive segment (2), and the outer walls of the second conductive segments (12) are connected to the conductive rail.

2. A direct-drive wind turbine generator generator to conductor rail connection structure according to claim 1, characterized in that: The connection structure also includes three connection bars, a first end of a connection bar is connected to a first end of a first lead-out copper bar (3), and a second end of a connection bar is connected to a phase cable of a three-phase cable of the generator.

3. A direct-drive wind turbine generator generator to conductor rail connection structure according to claim 1, characterized in that: The connection structure also includes three second lead-out copper bars (8), a first end of a second lead-out copper bar (8) being electrically connected to an outer side wall of a second conductive segment (12), and a second end of a second lead-out copper bar (8) being connected to a conductive rail.

4. A direct-drive wind turbine generator generator to conductor rail connection structure according to claim 1, characterized in that: The connection structure also includes at least three carbon brush holders (9), at least one carbon brush holder (9) is mounted on the inner side wall of a second conductive segment (12), and a carbon brush (7) is arranged on one carbon brush holder (9).

5. A direct-drive wind turbine generator generator to conductor rail connection structure according to claim 1, characterized in that: The insulating member is a stator bracket (10), the bottom end of the stator bracket (10) is fixedly connected to the yaw platform floor (6), and the top end of the stator bracket (10) is fixedly connected to the conductive stator.

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