Wind turbine generator set and its yaw twist cable structure

Abstract

The present invention provides a wind turbine generator set and its yaw twisted cable structure, comprising: a cable clamp, which is arranged in a cabin and located on the extension line of the tower rotation axis; an anti-collision platform, which is horizontally arranged at the top of the tower, and the anti-collision platform is provided with a through hole; a saddle bracket, which is arranged on the side wall of the tower below the anti-collision platform; a twisted cable, the starting end of the twisted cable is connected to the cable clamp, the twisted cable passes through the through hole of the anti-collision platform, and forms a U-shaped hanging bend below the saddle bracket, and the ending end of the twisted cable is connected to the saddle bracket; wherein, when the starting end of the twisted cable is twisted around the tower rotation axis as the cabin yaws, the lowest point of the U-shaped hanging bend is lifted upward, and the twisted cable does not contact the edge of the through hole of the anti-collision platform, which can prevent the twisted cable from colliding with the edge of the anti-collision platform, thereby enhancing the safety of the twisted cable.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind power generator set and a yaw twisted cable structure thereof. Background Art

[0002] Wind turbines are rotating machines that capture wind energy through blades to form kinetic energy, convert kinetic energy into electrical energy through generators, and then transmit electrical energy through the transmission system. Power cables are an important part of the transmission system. In order to facilitate the capture of wind energy, both direct-drive and doubly-fed wind turbines have a yaw system. During the yaw process of the wind turbine, a section of the transmission system cable needs to participate in the yaw rotation of the unit. This section of cable generally uses a torsion-resistant soft cable for wind turbines. The cable here is the twist-and-grasp section cable. Compared with the cable of the entire transmission system, the twist-and-grasp section cable has complex and changeable working conditions, and the cable laying and twist-and-grasp structure design are the most complex. The twist-and-grasp principle is not clear, and the cable laying structure design is not good, which can easily lead to problems such as collisions between the cable here and the surrounding mechanisms, thereby affecting the safe operation of the unit.

[0003] The twisted cable of the wind turbine transmission system starts from the cable clamp at the center of the head rotation, passes through the hole of the anti-collision platform, passes through the U-shaped hanging bend, reaches the saddle bracket of the tower wall, and then extends downward along the tower wall. When the wind turbine is in operation, the unit is affected by complex working conditions, and the twisted cable will twist, shake, collide, etc.

[0004] In order to avoid the above risks, a better designed yaw twist cable system is needed. The system includes cable clamps in the wind turbine nacelle, anti-collision platforms with cable holes, tower wall saddle brackets and other structures to prevent the twist cable from colliding with the anti-collision platform. Summary of the invention

[0005] Therefore, an object of the present invention is to provide a wind turbine generator set and a yaw twist cable structure thereof to solve the problem of collision between the yaw twist cable segment cable and the anti-collision platform in the prior art.

[0006] According to one aspect of the invention, a yaw twist cable structure of a wind turbine generator set is provided, comprising:

[0007] A cable clamp plate is arranged in the nacelle and is located on the extension line of the tower rotation axis;

[0008] An anti-collision platform is horizontally arranged at the top of the tower, and a through hole is arranged on the anti-collision platform;

[0009] A saddle bracket is arranged on the side wall of the tower below the anti-collision platform;

[0010] A twist cable, the starting end of which is connected to the cable clamp, the twist cable passes through the through hole of the anti-collision platform to form a U-shaped hanging bend below the saddle bracket, and the ending end of the twist cable is connected to the saddle bracket;

[0011] Among them, when the starting end of the twisted cable is twisted around the tower rotation axis as the cabin yaws, the lowest point of the U-shaped suspension bend is lifted upward, and the twisted cable does not contact the edge of the through hole of the anti-collision platform.

[0012] Optionally, the starting end of the twist cable is twisted in a range of 0 to 720 degrees around the tower rotation axis as the cabin yaws.

[0013] Optionally, during the twisting process of the starting end of the twist cable around the tower rotation axis as the cabin yaws, the hanging length of the twist cable is shortened, and the angle θ between the tangent line of the starting end and the horizontal line is B The range of variation is 80 degrees to 85 degrees, and the angle between the tangent line at the end and the horizontal line is θ A The range of variation is 75 degrees to 85 degrees.

[0014] Optionally, when the starting end of the twisted cable is twisted around the tower rotation axis as the cabin yaws, the position where the twisted cable passes through the anti-collision platform deviates from the tower rotation axis by more than 5 cm.

[0015] Optionally, a flexible suspension cable structure is formed between the starting end and the ending end of the twist cable.

[0016] Optionally, the vertical distance between the saddle bracket and the cable cleat ranges from 900 cm to 1100 cm.

[0017] Optionally, the horizontal distance between the saddle bracket and the cable cleat ranges from 90 cm to 130 cm.

[0018] According to another aspect of the invention, a wind turbine generator set is provided, comprising a generator arranged inside a nacelle, a tower, and the above-mentioned yaw twist cable structure; wherein a power cable output by the generator is connected to the cable clamp.

[0019] Compared with the existing structure, the wind turbine generator set and the yaw twisted cable structure according to the embodiment of the present invention can prevent the twisted cable section from colliding with the anti-collision platform under the premise that the yaw of the cabin causes the length of the twisted cable to be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1Schematic diagram of the yaw twist cable structure of a wind turbine generator set according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the transmission line according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the contour curve of a twist cable according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Now, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like components throughout.

[0025] Schematic diagram of the yaw twist structure of a wind turbine generator set Figure 1 As shown. The fixing method of the yaw twist cable of the wind turbine generator set is: A is the fixing position of the cable on the saddle bracket 100 on the tower wall, B is the fixing position of the cable on the cable clamp 300 in the wind turbine nacelle 200, O is the lowest hanging point of the twist cable, BB1 is the tower rotation axis of the wind turbine nacelle 200, C is the center hole position of the 1# anti-collision platform in the tower 400, D is the center hole position of the 2# anti-collision platform, E is the center hole position of the 3# anti-collision platform, C1, D1, E1 are the natural hanging offset points of the twist cable at the C, D, E platform hole positions, h is the sag height, H is the height difference of the twist suspension point, and L is the span of the twist suspension point. The structural design here includes: the cable clamp 300 at B, the 1# anti-collision platform at C, the anti-collision platform in the tower 400 at D / E, the saddle bracket 100 at A and other position layout and structural design.

[0026] The twisted cable section of the wind turbine power transmission system starts from point B of the cable clamp 300 at the center of the head rotation, passes through the U-shaped suspension bend downward, reaches point A of the tower wall saddle bracket 100, and then extends downward along the tower wall. When the wind turbine is in operation, the unit is affected by complex working conditions, and the twisted cable section may twist or collide with the anti-collision platform. In order to avoid the above risks and better design the laying structure of this section of cable, it is necessary to study the morphology of the twisted cable section. Figure 1 As shown, one end of the twist cable is fixed by a cable clamp 300 and the other end is fixed on a saddle bracket 100. The catenary form of the cable structure between the two fixed points is a typical flexible suspension cable structure without bending and compression resistance. The initial form of the cable is the equilibrium position form under the action of the cable's own weight or external load, which is similar to the catenary form of an overhead transmission line.

[0027] It should be noted that the yaw angle of the nacelle 200 usually ranges from 0 to 720 degrees. Under the premise that the yaw of the nacelle 200 shortens the length of the twist cable, the catenary shape changes, for example, the lowest point of the U-shaped hanging bend rises upward, the hanging length of the twist cable is shortened, and the position where the twist cable passes through the anti-collision platform deviates from the rotation axis of the tower and is closer to the edge of the through hole of the anti-collision platform, resulting in an increased risk of collision.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a yaw twist cable structure of a wind turbine generator set, comprising:

[0029] The cable clamp plate 300 is arranged in the nacelle 200 and is located on the extension line of the tower rotation axis;

[0030] An anti-collision platform is horizontally arranged at the top of the tower 400, and a through hole is arranged on the anti-collision platform;

[0031] A saddle bracket 100 is arranged on the side wall of the tower below the anti-collision platform;

[0032] A twist cable, the starting end of which is connected to the cable clamp plate 300, the twist cable passes through the through hole of the anti-collision platform to form a U-shaped hanging bend below the saddle bracket 100, and the ending end of the twist cable is connected to the saddle bracket 100;

[0033] Among them, when the starting end of the twisted cable is twisted around the tower rotation axis as the cabin 200 yaws, the lowest point of the U-shaped suspension bend is lifted upward, and the twisted cable does not contact the edge of the through hole of the anti-collision platform.

[0034] The starting end of the twist cable is twisted around the tower rotation axis with the random cabin 200 in a range of 0 to 720 degrees. A flexible suspension cable structure is formed between the starting end and the ending end of the twist cable. During the twisting process of the starting end of the twist cable and the random cabin 200 yawing around the tower rotation axis, the hanging length of the twist cable is shortened.

[0035] Take the catenary equation of overhead lines with unequal height suspension points as an example, Figure 2 The figure shows the schematic diagram of the transmission line. A and B are two suspension points, the span is l, the height difference is h, the vertical downward load γ is evenly distributed along the line, the direction is vertically downward, O is the lowest point of the sag, and the lower point A is selected as the coordinate origin. The shape formed under the deadweight load is an unequal height catenary.

[0036] exist Figure 2 In the figure, l is the conductor spacing, h is the height difference between the two transmission line hanging points, fm is the mid-span sag, σ A is the stress at point A, σ Bis the stress at point B, a is the distance from the lowest point to the left end, b is the distance from the lowest point to the right end, θ A is the angle between the tangent line at point A and the horizontal line, θ B is the angle between the tangent line at point B and the horizontal line, β is the angle between the tangent line at point AB and the horizontal line, σ0 is the stress at the lowest point, Xm is the mid-span distance, and γ is the specific load of the transmission line.

[0037] In order to prevent the twisted cable section from colliding with the anti-collision platform during the yaw of the nacelle 200, the starting end of the twisted cable is twisted around the tower rotation axis, and the angle θ between the starting end tangent and the horizontal line is B The range of variation is 80 degrees to 85 degrees, and the angle between the tangent line at the end and the horizontal line is θ A The range of variation is 75 degrees to 85 degrees. B The design of the angle range can prevent the twisted cable section near the starting end from contacting the edge of the anti-collision platform. A The design of the angle range can also prevent excessive horizontal tension between the end and the saddle bracket 100, thereby ensuring the safety and stability of the saddle bracket 100.

[0038] The span of overhead transmission lines is much larger than the cross-sectional size of the conductor, that is, the length of the transmission conductor is much larger than the diameter of the cable itself. At the same time, the transmission cable itself is made of multiple strands of fine metal wires. The rigidity of the overhead line itself has little effect on the shape of its hanging droop space curve. The following two assumptions can be made:

[0039] 1) Assume that the overhead line is a flexible cable chain without rigidity, which can only be pulled but not bent;

[0040] 2) Assume that the load acting on the overhead line is uniformly distributed along its length.

[0041] Based on the above two assumptions, the catenary equation of the overhead transmission line with unequal height suspension points when the coordinate origin is located at the left suspension point is:

[0042]

[0043] Among them: Self-weight specific load Unit: N / m·mm 2 Or MPa / m, q is the mass per unit length of the overhead line, kg / km, A is the cross-sectional area of ​​the conductor, unit is mm 2 .

[0044] Figure 3 1 is a schematic diagram of the contour curve of the twist cable according to an embodiment of the present invention. During the process that the starting end of the twist cable is yawed and twisted around the tower rotation axis with the cabin 200, the distance (i.e. Figure 3The C1C distance in the saddle bracket 100 is greater than 5 cm. The vertical distance H between the saddle bracket 100 and the cable clamp 300 ranges from 900 cm to 1100 cm. The horizontal distance L between the saddle bracket 100 and the cable clamp 300 ranges from 90 cm to 130 cm. Figure 3 In the illustrated embodiment, the vertical distance H between point A where the saddle bracket 100 is located and point B where the cable clamp 300 is located is 1000 cm, the horizontal distance L is 120.8 cm, the sag height h is 180 cm, the vertical distance H0 between point B where the cable clamp 300 is located and point C where the center hole of the 1# anti-collision platform is located is 358.5 cm, the vertical distance H1 between point C where the center hole of the 1# anti-collision platform is located and point D where the center hole of the 2# anti-collision platform is located is 270 cm, and the vertical distance H2 between point D where the center hole of the 2# anti-collision platform is located and point E where the center hole of the 3# anti-collision platform is located is 270 cm.

[0045] Based on the above conclusions, the boundaries of the wind turbine yaw twist cable laying structure and anti-collision structure design are obtained. When designing the platform distribution, openings, guard rings and anti-collision structures, the design can be based on the offset of the twist cable, thereby effectively solving the collision and wear problems of conventional twist cables.

[0046] An embodiment of the present invention further provides a wind turbine generator set, comprising a generator arranged inside a nacelle 200 , a tower 400 , and the wind turbine generator set yaw twist cable structure described above; wherein a power cable output by the generator is connected to the cable clamp 300 .

[0047] Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. However, it should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims.

Claims

1. A yaw twisted cable structure for a wind turbine generator set, characterized in that: include: A cable clamp plate is arranged in the nacelle and is located on the extension line of the tower rotation axis; An anti-collision platform is horizontally arranged at the top of the tower, and a through hole is arranged on the anti-collision platform; A saddle bracket is arranged on the side wall of the tower below the anti-collision platform; A twist cable, the starting end of which is connected to the cable clamp, the twist cable passes through the through hole of the anti-collision platform to form a U-shaped hanging bend below the saddle bracket, and the ending end of the twist cable is connected to the saddle bracket; Among them, when the starting end of the twisted cable is twisted around the rotation axis of the tower as the cabin yaws, the lowest point of the U-shaped hanging bend is lifted upward, and the twisted cable does not contact the edge of the through hole of the anti-collision platform, the hanging length of the twisted cable is shortened, and the angle θ between the tangent line of the starting end and the horizontal line is B The range of change is 80 degrees to 85 degrees.

2. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: The starting end of the twist cable is twisted around the tower rotation axis in a range of 0 to 720 degrees as the cabin yaws.

3. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: The starting end of the twisted cable is twisted around the tower rotation axis as the cabin yaws, and the angle between the tangent line at the end of the twisted cable and the horizontal line is θ A The range of variation is 75 degrees to 85 degrees.

4. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: When the starting end of the twisted cable is twisted around the tower rotation axis as the cabin yaws, the position where the twisted cable passes through the anti-collision platform deviates from the tower rotation axis by more than 5 cm.

5. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: A flexible suspension cable structure is formed between the starting end and the ending end of the twist cable.

6. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: The vertical distance between the saddle bracket and the cable cleat ranges from 900 cm to 1100 cm.

7. The yaw twisted cable structure of a wind turbine generator set according to claim 1, characterized in that: The horizontal distance between the saddle bracket and the cable cleat ranges from 90 cm to 130 cm.

8. A wind turbine generator set, characterized in that: It comprises a generator arranged inside a nacelle, a tower and a yaw twisted cable structure of a wind turbine generator set according to any one of claims 1 to 7; Wherein, the power cable output by the generator is connected to the cable clamp.

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