Novel cable wear suppression device for wind generating set

Abstract

The embodiment of the invention provides a novel wind generating set cable wear suppression device which is arranged on a power cable connected between a generator and a converter and comprises a device body wrapping the surface of the power cable. The device body comprises a device wall surface, and a spiral surface is arranged on the surface, in contact with a power cable, of the device body; the spiral surface and the wall surface of the device form a damping liquid flowing channel; the damping fluid flowing channel is filled with damping fluid. The damping fluid is reasonable in structural arrangement, when the damping fluid is connected with a power cable, counter-acting force is generated on the power cable through anti-phase shaking generated by the damping fluid, the power cable can be made to be stable instead of shaking, sliding and abrasion of the power cable can be relieved, the use stability of the power cable can be improved, and the service life of the power cable can be prolonged. The cable protection effect is improved, and vibration suppression at different wind speeds can be realized, so that the safety of the wind generating set is ensured, and the reliability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable protection for wind turbine generator sets, and in particular to a novel cable wear suppression device for wind turbine generator sets. Background Art

[0002] Wind turbines are green equipment that converts wind energy into electrical energy. New power systems with a high proportion of renewable energy require wind turbines with high installed capacity to support them. At the same time, higher requirements are also placed on wind turbines, that is, high reliability and safety.

[0003] The operation and maintenance cost of a wind turbine during its life cycle is an important component of the total cost of the unit. It involves many systems and components, and the power cable of the unit is one of the important parts of the wind turbine that needs to be maintained. The unit will shake during operation, and because the number and weight of the power cables of the unit are large, the power cables of the unit are prone to slide down under the load of gravity and inertia during the shaking process. After sliding down, the power cables of the unit are prone to friction with the platform, causing wear, thereby causing electrical safety hazards.

[0004] In order to solve the above technical deficiencies, the prior art mostly adopts clamping or fixing restraint devices to position the unit power cables, such as patents CN218733082U, CN109494658B, and CN218633153U; cable protection devices are also used, such as patents CN209875394U and CN208461372U.

[0005] In the process of realizing the above invention, the inventors found that there are at least the following problems in the prior art: the existing technical means or solutions are all improvements from the perspective of static load-bearing. Although they can also achieve certain protection purposes, they do not take into account the dynamic load effect of the cable, and the dynamic effect dominates the cable sliding down or wear. That is, the prior art cannot fundamentally solve the problem of friction between the wire and the platform after sliding down and causing wear, and it requires local squeezing and clamping of the cable, which is not very friendly to the local stress of the power cable, and will also affect its use effect to a certain extent. Summary of the invention

[0006] In view of this, an object of an embodiment of the present invention is to provide a novel wind turbine cable wear suppression device which has a reasonable structure and is conducive to improving the cable protection effect.

[0007] In a first aspect, an embodiment of the present invention provides a novel wind turbine cable wear suppression device, which is arranged on a power cable and includes a device body coated on the surface of the power cable;

[0008] The device body comprises a device wall surface, and a helical surface is arranged on the surface of the device body in contact with the power cable;

[0009] The spiral surface and the device wall surface form a damping liquid flow channel;

[0010] The damping fluid flow channel is filled with damping fluid.

[0011] It is further preferred that: the spiral surface is provided with fins for increasing the energy dissipation capacity of the damping fluid when it flows.

[0012] It is further preferred that: the device body is a hollow cylindrical body, and the helical surface is located on the inner wall of the hollow cylindrical body;

[0013] The hollow cylindrical body is sleeved on the outside of the power cable.

[0014] It is further preferred that: the spiral surface is a spiral plate, and the spiral plate is attached to the wall of the device to form a certain pitch and a certain number of turns;

[0015] The fins are surface fins.

[0016] It is further preferred that: the number of the hollow cylindrical bodies is at least three;

[0017] One of the hollow cylindrical bodies is arranged on the upper part of the power cable near the generator outlet position;

[0018] One of the hollow cylindrical bodies is arranged at a position of the power cable close to the saddle platform;

[0019] The remaining hollow cylindrical body is arranged on the power cable between the outlet position close to the generator and the position close to the saddle platform.

[0020] It is further preferred that: the damping fluid in the device body generates a kinetic inertial force during damping motion;

[0021] At the same time, the shear dissipation force generated by the damping fluid and the flow channel walls formed by the spiral plate, boundary fins and device wall when the damping fluid moves;

[0022] Among them, the inertia force of motion can be expressed as: F inertia =ρ·V liquid a;

[0023] Where ρ is the density of the damping fluid, V flow is the liquid volume corresponding to the damping liquid, a is the local vibration acceleration;

[0024] Among them, the shear dissipation force can be expressed as:

[0025] Where η is the dynamic viscosity of the damping fluid; Δv is the velocity gradient of the damping fluid; h is the liquid level; A tube is the cross-sectional area of ​​the spiral tube.

[0026] Or preferably: the device body is a spiral body;

[0027] The spiral surface and the device wall surface are both spiral wall surfaces, and the fin is an inner fin;

[0028] The spiral body is wound around the outside of the power cable.

[0029] More preferably:

[0030] The fluid flow path length of the damping fluid is expressed as: L spiral =n·π·D;

[0031] Where, L spiral is the total length of the flow channel, n is the number of spiral turns corresponding to the spiral surface immersed in the damping fluid in the device body; D is the spiral diameter corresponding to the cross-section immersed in the damping fluid in the device body.

[0032] It is further preferred that: the length of the damping fluid flow channel and the filling height of the damping fluid are determined according to the vibration modal frequency corresponding to the position of the power cable.

[0033] In a second aspect, an embodiment of the present invention provides a novel wind turbine cable wear suppression device, which is arranged on a floating wind turbine, wherein the floating wind turbine includes a floating support structure;

[0034] The floating body support structure comprises a floating body support body arranged on the sea surface line, a central column arranged on the floating body support body and three floating body columns, wherein the central column is located at the center of the three floating body columns, and the three floating body columns are arranged in a triangle shape;

[0035] The bottom surface of the floating support body is provided with anchor chains and power cables sunk to the seabed;

[0036] The wind turbine generator cable wear suppression device is arranged on the power cable.

[0037] The above technical solution has the following beneficial effects:

[0038] 1. The structure of the present invention is reasonable. The device body includes a device wall, and a spiral surface is arranged on the surface of the device body in contact with the power cable; the spiral surface and the device wall form a damping liquid flow channel; the damping liquid flow channel is filled with damping liquid, and when the damping liquid cooperates with the device wall and the spiral surface, the damping liquid generates an anti-phase sway when connected to the power cable, thereby generating a reaction force on the power cable, so that the power cable can be stable instead of swaying, and the power cable can be alleviated from sliding down and wearing, which is beneficial to improving the stability of use and service life of the power cable, and it can realize the combined vibration control of the wind turbine in the X direction or the Y direction or both directions, has controllability, improves the cable protection effect, and can achieve vibration suppression under different wind speeds, thereby ensuring the safety of the wind turbine and improving reliability;

[0039] 2. The spiral surface is provided with fins for increasing the energy dissipation capacity of the damping fluid during flow, which can further improve the energy dissipation effect of the device body, and can quickly and effectively consume and disperse the shaking force or wear force of the power cable, which is beneficial to improving the stability of the power cable, and can alleviate the sliding and wear of the power cable, thereby increasing the service life of the power cable;

[0040] 3. The device body is a hollow cylindrical body. With the above structure, it can be connected with the power cable sleeve, which improves the assembly efficiency and assembly stability with the power cable, facilitates assembly and connection, and can be installed at different positions of the power cable as needed to meet the wear suppression requirements of the power cable at different positions, thereby improving the effectiveness and reliability of wear suppression;

[0041] 4. The device body is a spiral body. When connected and used, it can be directly wound around the outside of the power cable, which improves the convenience and effectiveness of assembly. Moreover, it can be connected to the power cable at a single point or multiple points as needed to meet the wear suppression requirements of power cables at different positions, and improve the effectiveness and reliability of wear suppression.

[0042] 5. It makes full use of wind turbine components, especially those in the nacelle, to make the components more functional. On the one hand, it solves the vibration problem of the unit, and on the other hand, it also improves the overall economy of the unit;

[0043] 6. By adjusting the filling height and channel length of the damping liquid, the operating frequency of the device body is matched with the modal frequency of the suspended power cable, thereby suppressing the bending, tensile and torsional vibrations of the suspended power cable; effectively suppressing the vibration at the connection between the suspended section and the floating body; alleviating the bending stress caused by large vibrations; and balancing the tensile vibration at the seabed end. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 is a schematic diagram of the specific structure of a wind turbine generator set in an embodiment of the present invention;

[0046] Figure 2 This is a structural schematic diagram of a device body in an embodiment of the present invention when it is a hollow cylindrical body connected to a power cable;

[0047] Figure 3 It is a schematic cross-sectional view of the structure when the device body is connected to the power cable in an embodiment of the present invention;

[0048] Figure 4 for Figure 3 Schematic diagram of the BB structure;

[0049] Figure 5 This is a structural schematic diagram of the device body in an embodiment of the present invention when it is a spiral body connected to a power cable;

[0050] Figure 6 Schematic diagram of the structure of the spiral body in an embodiment of the present invention;

[0051] Figure 7 for Figure 6 The enlarged structural diagram at C in the middle;

[0052] Figure 8 It is a schematic diagram comparing the acceleration of the power cable with and without the device body on the top of the power cable in an embodiment of the present invention;

[0053] Fig. 9 It is a schematic diagram comparing the acceleration of the power cable with and without the device body in the middle of the power cable in the embodiment of the present invention;

[0054] Fig.10 It is a schematic diagram comparing the acceleration of the power cable with and without the device body at the bottom in an embodiment of the present invention;

[0055] Fig.11 This is a temperature comparison diagram of the power cable before and after the device body is installed in the embodiment of the present invention;

[0056] Fig.12 This is a schematic diagram of the structure of an embodiment of the present invention applied to a floating wind turbine generator set;

[0057] Fig.13 for Fig.12 DD cross-section diagram of the structure.

[0058] Reference numerals:

[0059] 1. Blades; 2. Hub; 3. Drive shaft; 4. Gearbox; 5. Generator; 6. Nacelle; 7. Power cable; 8. Saddle platform; 9. Tower; 10. Converter; 11. Device body; 12. Floating support structure; 13. Sea surface line; 14. Seabed; 15. Anchor chain;

[0060] 11-1, device wall; 11-2, spiral surface; 11-3, damping fluid; 11-4, fin;

[0061] 121. floating body support body; 122. central column; 123. floating body column. DETAILED DESCRIPTION

[0062] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least part of the known structures and technologies are not shown in order to avoid unnecessary ambiguity of the present invention; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0063] Embodiment 1

[0064] like Figures 1 to 4 and Figures 8 to 11 As shown, a new type of wind turbine cable wear suppression device, such as Figure 1In the figure, the wind turbine generator set mainly includes blades 1, hub 2, transmission shaft 3, gearbox 4, generator 5, nacelle 6, power cable 7, saddle platform 8, tower 9, converter 10 and other components. Blade 1 absorbs incoming wind energy and converts the wind energy into rotational mechanical energy of hub 2 and transmission shaft 3. Then, after driving the coaxial gearbox 4 to increase the speed, generator 5 converts the mechanical energy into electrical energy, which is transmitted to converter 10 through power cable 7 for rectification and inversion, and then connected to the grid after voltage boosting, thereby realizing power production and transmission. Considering the current carrying capacity of power cable 7, the electric energy output by generator 5 is usually shunted and carried by multiple power cables 7. Usually, the outgoing line of generator 5 is directly distributed in nacelle 6, and twisted cable is realized through saddle platform 8, and then the power cable 7 is fixed to tower 9 and transmitted to the bottom of tower 9. In order to prevent collision, interference, etc. of multiple power cables 7 in the vibration environment of wind turbine generator set operation, and to avoid further aggravation of sliding and wear of power cables 7 under the influence of these factors.

[0065] like Figure 2 , Figure 3 and Figure 4 As shown, the cable wear suppression device is arranged on the power cable connecting the generator outlet to the converter inlet, and can be specifically arranged on the power cable 7 between the outlet of the generator 5 and the saddle platform 8, including a device body 11 coated on the surface of the power cable 7; in this embodiment, the device body 11 is a hollow cylindrical body, and the spiral surface 11-2 is on the inner wall of the hollow cylindrical body; the hollow cylindrical body is sleeved on the outside of the power cable 7.

[0066] Moreover, in this embodiment, the device body 11 includes a device wall 11-1, and a spiral surface 11-2 is provided on the surface of the device body 11 in contact with the power cable 7; the spiral surface 11-2 and the device wall 11-1 form a damping fluid flow channel; the damping fluid flow channel is filled with damping fluid 11-3. By adjusting the frequency of the device body 11 at different positions of the power cable 7 (this frequency refers to the frequency of the device body 11, which is itself an object. As long as it is an object, it has a frequency. The frequency of the device body 11 can be adjusted according to the filler, shape, etc., so that it is configured at different positions of the power cable 7 to match the frequency at the corresponding position, thereby suppressing vibration), the frequency of the device body 11 is made the same or similar to the local mode of the power cable 7, so that the damping liquid 11-3 produces anti-phase shaking, thereby generating a reaction force on the power cable 7, so that the power cable 7 is in a stable rather than shaking state, and the shaking energy of the power cable 7 is dissipated by the viscosity of the damping liquid 11-3, thereby alleviating the sliding and wear of the power cable 7. It adopts a central cavity cylindrical body, which can be directly mounted on different positions of the power cable 7 during assembly; the damping liquid 11-3 adopts a relatively high viscosity and low-temperature resistant liquid, such as silicone oil or ethylene glycol liquid, and can also be replaced by other liquids with similar properties. In order to increase the effective mass of shaking, solid particles can be added to the damping liquid 11-3.

[0067] like Figures 2 to 4 As shown, the spiral surface 11-2 is provided with fins 11-4 for increasing the energy dissipation capacity of the damping liquid 11-3 when it flows. The energy dissipation capacity of the damping liquid 11-3 when it flows can be enhanced by the fins 11-4, thereby improving the effectiveness and stability of vibration suppression. The length of the damping liquid flow channel and the filling height of the damping liquid 11-3 are determined according to the vibration modal frequency corresponding to the position of the power cable 7.

[0068] like Figure 5 and Figure 6 As shown, the liquid level is determined as follows:

[0069] Determine the vibration modal frequency f, the cable wear suppression device must be consistent with the vibration modal frequency f:

[0070]

[0071] Where, L eff is the effective length of the liquid;

[0072] The calculation formula of the effective length of liquid in the spiral tube is as follows:

[0073]

[0074] In the formula, A tube is the cross-sectional area of ​​the spiral tube; V liquid is the volume of liquid; its spiral tube corresponds to Figure 5 The appearance in the figure is a spiral tube structure.

[0075] The formula for determining the volume of a liquid is as follows:

[0076] V liquid =A tube ·h;

[0077] Where h is the liquid level height.

[0078] The calculation formula of liquid level h is as follows:

[0079]

[0080] like Figure 3 As shown, in this embodiment, the spiral surface 11-2 is a spiral plate, which is attached to the device wall 11-1 to form a certain pitch and a certain number of turns; the spiral surface 11-2 corresponds to Figure 3 The spiral surface in the embodiment of the present invention is determined by the liquid level height corresponding to the frequency, and then the combination of the pitch and the number of turns is determined, and the fin 11-4 is a boundary fin. In addition, the number of hollow cylindrical bodies is at least three; one of the hollow cylindrical bodies is arranged at the upper part of the power cable 7 near the outlet position of the generator 5; one of the hollow cylindrical bodies is arranged at the position of the power cable 7 near the saddle platform 8; the remaining hollow cylindrical bodies are arranged on the power cable 7 between the above-mentioned outlet position of the power cable 7 near the generator 5 and the above-mentioned position near the saddle platform 8, wherein the device body 11 is sleeved on the cylindrical power cable 7 or wound on the power cable 7 with a certain pitch. In actual application, the power cable 7 and the saddle platform 8 at the outlet section of the generator 5 are long and flexible structures, and the vibration modes at different positions are inconsistent. Therefore, it is necessary to set the device body 11 in different areas, which can effectively suppress the sliding or wear of the power cable 7 caused by the shaking generated by the operation of the wind turbine generator set, and the three positions can also be used as a single device body or a combination of multiple device bodies 11.

[0081] like Figures 3 to 5 As shown, the inertial force generated by the damping fluid 11-3 in the device body 11 during damping motion; at the same time, the shear dissipation force generated by the damping fluid 11-3 and the wall surfaces of the flow channel formed by the spiral plate, the boundary fin and the device wall 11-1 during motion; wherein the inertial force can be expressed as: F inertia =ρ·V liquid a;

[0082] Where ρ is the density of the damping fluid, V liquid is the liquid volume, a is the local vibration acceleration; the local vibration acceleration is the acceleration at a certain part or coordinate, which can be directly measured by an acceleration sensor.

[0083] Among them, the shear dissipation force can be expressed as:

[0084] Where η is the dynamic viscosity of the damping fluid; Δv is the velocity gradient of the damping fluid; h is the liquid level; A tube is the cross-sectional area of ​​the spiral tube.

[0085] The comparison pictures before and after installation are as follows: Figure 8-Figure 11 As shown in the figure, it can be seen from the comparison that, in the case of the device body 11, the acceleration can be effectively reduced, thereby reducing the shaking and achieving the vibration suppression effect.

[0086] The above technical solution has the following beneficial effects:

[0087] 1. The structure of the present invention is reasonable. The device body includes a device wall, and a spiral surface is arranged on the surface of the device body in contact with the power cable; the spiral surface and the device wall form a damping liquid flow channel; the damping liquid flow channel is filled with damping liquid, and when the damping liquid cooperates with the device wall and the spiral surface, the damping liquid generates an anti-phase sway when connected to the power cable, thereby generating a reaction force on the power cable, so that the power cable can be stable instead of swaying, and the power cable can be alleviated from sliding down and wearing, which is beneficial to improving the stability of use and service life of the power cable, and it can realize the combined vibration control of the wind turbine in the X direction or the Y direction or both directions, has controllability, improves the cable protection effect, and can achieve vibration suppression under different wind speeds, thereby ensuring the safety of the wind turbine and improving reliability;

[0088] 2. The spiral surface is provided with fins for increasing the energy dissipation capacity of the damping fluid during flow, which can further improve the energy dissipation effect of the device body, and can quickly and effectively consume and disperse the swaying force or wear force of the power cable, which is beneficial to improving the stability of the power cable, relieving the sliding and wear of the power cable, and prolonging the service life of the power cable;

[0089] 3. The device body is a hollow cylindrical body. With the above structure, it can be connected with the power cable sleeve, which improves the assembly efficiency and assembly stability with the power cable, facilitates assembly and connection, and can be installed at different positions of the power cable as needed to meet the wear suppression requirements of the power cable at different positions, thereby improving the effectiveness and reliability of wear suppression;

[0090] 4. The device body is a spiral body. When connected and used, it can be directly wound around the outside of the power cable, which improves the convenience and effectiveness of assembly. Moreover, it can be connected to the power cable at a single point or multiple points as needed to meet the wear suppression requirements of power cables at different positions, and improve the effectiveness and reliability of wear suppression.

[0091] 5. It makes full use of wind turbine components, especially those inside the nacelle, to make the components play more functions. On the one hand, it solves the vibration problem of the unit, and on the other hand, it also improves the overall economy of the unit.

[0092] like Figures 5 to 7 As shown, this embodiment is basically the same as the first embodiment, except that: the device body 11 is a spiral body; the spiral surface 11-2 and the device wall surface 11-1 are both spiral walls, and the fin 11-4 is an inner fin; the spiral body is wound around the outside of the power cable 7. Figure 7 In the figure, ΔL represents the distance between the boundary fins, which is preferably 3 to 5 times the height of the boundary fins; α represents the inclination angle of the boundary fins, which ranges from 30 to 50 degrees.

[0093] The fluid flow path length of the damping fluid 11-3 can be expressed as: L spiral =n·π·D; where L spiral is the total length of the flow channel, n is the number of spiral turns corresponding to the spiral surface 11-2 immersed in the damping liquid in the device body 11; D is the spiral diameter corresponding to the damping liquid immersed section in the device body 11. The number of spiral turns is the number of winding turns, which corresponds to the pitch. The function of the boundary fin is explained as follows. By adding the boundary fin of the disturbance element in the spiral flow channel, the fluid velocity gradient in the spiral flow channel can be increased to adjust the energy dissipation efficiency. It changes the flow path of the liquid, forms a vortex area, and further enhances the energy dissipation effect; it can change the adaptability range of the device body 11 to different frequencies and expand the working frequency band of the device body 11. The path length, the number of spiral turns, and the liquid level height are actually equivalent parameters. The vibration frequency of the device body 11 is adjusted by changing the number of spiral turns. For example, in high-frequency vibration scenarios, the shear dissipation capacity is improved by increasing the number of boundary fins; in medium and low-frequency vibration scenarios, the number of spiral turns is reduced to enhance the inertial response of the liquid.

[0094] The structural characteristics of the surface fin are described in detail below:

[0095] In terms of shape, it can be a triangular piece, which is simple and easy to manufacture, with strong and evenly distributed vortex. It can also be a trapezoidal piece, which is suitable for controlling flow resistance in a specific direction. It can also be an arc-shaped piece, with stable vortex and high shear efficiency.

[0096] In terms of size, the length dimension is preferably 20% to 50% of the channel width. The thickness dimension is preferably as thin as possible (e.g., 1 to 3 mm) to reduce the volume occupied by the liquid. The height dimension of the boundary fin is preferably about 50% to 70% of the channel depth. The inclination angle α is preferably 30° to 45° (e.g., Figure 7 As shown), it is beneficial to balance the vortex intensity and liquid flow efficiency.

[0097] In terms of distribution, it can be evenly distributed, so that the eddy current effect is uniform and suitable for wide-band vibration. It can also be unevenly distributed, but concentrated in a specific area to enhance local damping. Preferably, it is arranged according to 1 to 2 times the flow channel diameter.

[0098] In terms of materials, choose corrosion-resistant and wear-resistant materials, such as stainless steel or polymer composite materials.

[0099] The spiral body is arranged at a single point or multiple points. The above structure can be directly wound on the power cable 7 at a single point, or can be wound on the power cable 7 at multiple points to improve the effectiveness and stability of vibration suppression.

[0100] Embodiment 2

[0101] The new cable wear suppression device proposed in the present invention can be simultaneously applied to marine engineering and floating wind turbine floating power cable scenarios, that is, the floating cable delivery section to the submarine cable connection section (that is, the suspension section cable between the floating body and the seabed). Taking the floating wind turbine as an example, in the floating wind turbine (FOWT), the cable connects the floating body and the seabed, which is a key component for realizing power transmission and data communication. The suspension cable has been in a complex marine environment for a long time, and is affected by various loads such as waves, tides, and ocean currents. Its dynamic characteristics are relatively complex, and the main problems are as follows: due to the drift, pitch and yaw of the floating body, the suspension section cable is prone to periodic bending and torsional vibration; the suspension section cable rubs against itself or other structures in the environment under violent movement, which is easy to cause wear; under the dynamic action of waves and floating bodies, the suspension section cable is subjected to the coupling of high-frequency or low-frequency vibrations, which may cause cable fatigue failure; the cable is exposed to corrosive seawater and low-temperature environment, which further aggravates the wear and aging problems.

[0102] like Fig.12 and Fig.13 As shown, a novel wind turbine cable wear suppression device is arranged on a suspended power cable of a floating wind turbine, wherein the floating wind turbine comprises a floating support structure 12, wherein the floating support structure 12 comprises a floating support body 121 arranged on a sea surface line 13, a central column 122 arranged on the floating support body 121, and three floating columns 123, wherein the central column 122 is located at the center of the three floating columns 123, and the three floating columns 123 are arranged in a triangle;

[0103] The bottom surface of the floating support body 121 is provided with an anchor chain 15 and a power cable 7 sunk on the seabed 14;

[0104] The wind turbine generator cable wear suppression device is arranged on the power cable 7 .

[0105] By adjusting the filling height and channel length of the damping liquid, the operating frequency of the device body 11 is matched with the modal frequency of the suspended power cable 7, thereby suppressing the bending, tensile and torsional vibrations of the suspended power cable; effectively suppressing the vibration at the connection between the suspended section and the floating body; alleviating the bending stress caused by large vibrations; and balancing the tensile vibration at the seabed end.

[0106] A spiral surface is provided on the surface of the device body 11 in contact with the power cable 7, and the spiral surface and the device wall form a damping liquid flow channel, and the damping liquid flow channel is filled with damping liquid 11-3; the device body 11 is a multi-partitioned spiral structure, and the pitch is adjustable to adapt to different vibration modes of the suspended power cable section; the damping liquid 11-3 is made of low-temperature resistant and highly corrosion-resistant liquid, and the damping liquid may contain solid particles that enhance the mass effect; by adjusting the filling height and channel length of the damping liquid 11-3, the operating frequency of the device body 11 is matched with the modal frequency of the suspended power cable, thereby suppressing the bending, stretching and torsional vibrations of the suspended power cable.

[0107] The device body 11 is a spiral structure, and a spiral surface is provided on the surface in contact with the suspended power cable 7. The spiral surface and the device wall together form a damping liquid flow channel, and the channel is filled with damping liquid 11-3. The damping liquid 11-3 uses a corrosion-resistant and low-temperature-resistant liquid (such as modified ethylene glycol), and solid particles (such as metal powder or glass beads) that enhance the mass effect can be added.

[0108] In order to adapt to the different vibration modes of the suspended cable, the device body 11 adopts an adjustable pitch design, and dynamic adaptation is achieved by adjusting the channel length and the filling height of the damping liquid 11-3. One or more device bodies 11 are installed near the outlet of the floating body to suppress the vibration of the connection between the suspended section and the floating body; one or more device bodies 11 are installed in the middle of the suspended section of the power cable 7 to relieve the bending stress caused by large vibrations; one or more device bodies 11 are installed near the seabed connection end to balance the tensile vibration of the seabed connection end. The number and position of the arrangement points of the device body 11 can be optimized according to the vibration mode of the suspended cable.

[0109] The periodic vibration of the suspended cable under the external load triggers the flow of damping fluid in the spiral channel. Due to the guiding effect of the spiral structure, the flow of damping fluid 11-3 produces anti-phase swaying in the opposite direction of the cable vibration, thereby exerting a reaction force on the power cable 7. The movement of damping fluid 11-3 in the spiral channel is affected by shear force. Shear dissipation force is the main source of energy consumption. The vibration energy of the power cable 7 is converted into heat energy inside the damping fluid 11-3 through this mechanism, thereby reducing the power cable 7.

[0110] Since the vibration of the suspended section power cable 7 has nonlinear characteristics (for example, large amplitude causes stiffness changes), the high viscosity flow and particle enhancement effect of the damping liquid 11-3 can provide additional nonlinear dissipation force; through multi-point arrangement, the device body 11 can perform partition optimization according to the vibration modes of different sections of the power cable 7, thereby improving the overall vibration suppression effect.

[0111] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0112] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or 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.

[0113] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A novel cable wear suppression device for a wind turbine generator set, arranged on a power cable (7), characterized in that: It comprises a device body (11) coated on the surface of the power cable (7); The device body (11) comprises a device wall surface (11-1), and a spiral surface (11-2) is provided on the surface of the device body (11) in contact with the power cable (7); The spiral surface (11-2) and the device wall surface (11-1) form a damping liquid flow channel; The damping liquid flow channel is filled with damping liquid (11-3).

2. According to claim 1, a novel wind turbine cable wear suppression device is characterized in that: The spiral surface (11-2) is provided with fins (11-4) for increasing the energy dissipation capability of the damping fluid (11-3) when it flows.

3. A novel wind turbine cable wear suppression device according to claim 2, characterized in that: The device body (11) is a hollow cylindrical body, and the spiral surface (11-2) is located on the inner wall of the hollow cylindrical body; The hollow cylindrical body is sleeved on the outside of the power cable (7).

4. According to claim 3, a novel wind turbine cable wear suppression device is characterized in that: The spiral surface (11-2) is a spiral plate, and the spiral plate is attached to the device wall surface (11-1) to form a certain pitch and a certain number of turns; The fin (11-4) is a boundary fin.

5. A novel wind turbine cable wear suppression device according to claim 4, characterized in that: The number of the hollow cylindrical bodies is at least three; One of the hollow cylindrical bodies is arranged on the upper part of the power cable (7) near the outlet position of the generator (5); One of the hollow cylindrical bodies is arranged at a position of the power cable (7) close to the saddle platform (8); The remaining hollow cylindrical body is arranged on the power cable (7) between a position close to the outlet of the generator (5) and a position close to the saddle platform (8).

6. A novel wind turbine cable wear suppression device according to claim 5, characterized in that: The damping fluid (11-3) in the device body (11) generates a motion inertia force during damping motion; When the damping fluid (11-3) moves, it generates shear dissipation force on the wall surfaces of the flow channel formed by the spiral plate, the boundary fins and the device wall surface (11-1); Wherein, the inertial force of motion is expressed as: F inertia =ρ·V liquid a; Where ρ is the density of the damping fluid, V liquid is the liquid volume corresponding to the damping liquid, a is the local vibration acceleration; Wherein, the shear dissipation force is expressed as: Where η is the dynamic viscosity of the damping fluid; Δv is the velocity gradient of the damping fluid; h is the liquid level; A tube is the cross-sectional area of ​​the spiral tube.

7. The novel wind turbine cable wear suppression device according to claim 2 is characterized in that: The device body (11) is a spiral body; The spiral surface (11-2) and the device wall surface (11-1) are both spiral wall surfaces, and the fin (11-4) is an inner fin; The spiral body is wound around the outside of the power cable (7).

8. The novel wind turbine cable wear suppression device according to claim 7 is characterized in that: The fluid flow path length of the damping fluid (11-3) is expressed as: L spiral =n·π·D; Where, L spiral is the total length of the fluid flow channel, n is the number of spiral turns corresponding to the spiral surface (11-2) immersed in the damping fluid in the device body (11); and D is the spiral diameter corresponding to the cross section immersed in the damping fluid in the device body (11).

9. The novel wind turbine cable wear suppression device according to claim 7 is characterized in that: The length of the damping liquid flow channel and the filling height of the damping liquid (11-3) are determined according to the vibration modal frequency corresponding to the position of the power cable (7).

10. A new type of wind turbine cable wear suppression device, arranged on a floating wind turbine, characterized in that: The floating wind turbine generator set comprises a floating support structure (12), wherein the floating support structure (12) comprises a floating support body (121) arranged on a sea surface line (13), a central column (122) arranged on the floating support body (121), and three floating columns (123), wherein the central column (122) is located at the center of the three floating columns (123), and the three floating columns (123) are arranged in a triangle; The bottom surface of the floating support body (121) is provided with an anchor chain (15) and a power cable (7) sunk on the seabed (14); The wind turbine generator cable wear suppression device according to any one of claims 1 to 9 is arranged on the power cable (7).

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