Tower-drum-free semi-submersible stabilization floating fan platform and stabilization method thereof

Abstract

The invention belongs to the technical field of floating fans, and provides a tower-barrel-free semi-submersible stabilization floating fan platform and a stabilization method thereof.The tower-barrel-free semi-submersible stabilization floating fan platform comprises a fan and a floating barrel arranged on the lower portion of the fan; the buoy comprises a first column section close to one end of the fan and a first conical section arranged at one end, far away from the fan, of the first column section; the minimum diameter of the first column section is equal to that of the first conical section, so that the action area of the wind load is reduced; a stabilization ring is arranged on the first column section and located at the upper end of the waterplane to reduce heaving motion and pitching and rolling motion of the floating body, when the wave force is small, the stabilization ring can achieve the good stabilization effect, the wind load surface can be reduced through the first column section, swing motion caused by the wind load is reduced, and the first column section is simple in structure and convenient to use. The design and manufacturing are easy.

Description

Technical Field

[0001] The present invention belongs to the technical field of floating wind turbines, and in particular relates to a tower-less semi-submersible anti-sway floating wind turbine platform and a anti-sway method thereof. Background Art

[0002] Floating wind turbines are deployed in deep waters, where environmental conditions are more severe than those in nearshore waters. Due to higher wave heights, floating wind turbines experience significantly increased wave loads and swaying motion, significantly reducing the turbine's efficiency.

[0003] To reduce the swaying motion under the action of waves, conventional technology employs a column-structured buoy with a dumbbell-shaped column in the middle near the waterline to reduce the force of waves. The lower and upper portions of the dumbbell-shaped column are enlarged ends, which increase the hydraulic mass, reduce the heave of the overall structure, and gradually increase the restoring force, which is beneficial to the stability of the foundation. However, when the wave force is relatively small, the sway reduction effect of the middle column section of the buoy with the column structure is poor, and the upper portion of the dumbbell-shaped column is stepped with a larger diameter, which increases the wind-bearing surface, is not conducive to sway reduction, and is difficult to manufacture. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a tower-less semi-submersible anti-roll floating wind turbine platform and a anti-roll method thereof. A anti-roll ring is provided on the first column section. The anti-roll ring is located at the upper end of the waterline to reduce the heave motion and pitch and roll motion of the floating body. When the wave force is small, the anti-roll ring can achieve a good anti-roll effect. The first column section can reduce the wind load area, reduce the swaying motion caused by the wind load, and the first column section has a simple structure and is easy to design and manufacture.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a towerless semi-submersible anti-roll floating wind turbine platform, which adopts the following technical solutions: A towerless semi-submersible anti-roll floating wind turbine platform comprises a wind turbine and a buoy arranged below the wind turbine; the buoy comprises a first column section close to one end of the wind turbine and a first conical section arranged at an end of the first column section away from the wind turbine; The minimum diameters of the first column section and the first conical section are equal, reducing the area where wind load acts; a roll reduction ring is provided on the first column section, and the roll reduction ring is located at the upper end of the waterline to reduce the heave motion and pitch and roll motion of the floating body.

[0006] Furthermore, the wind turbine is arranged on the buoy through a support assembly; the support assembly includes a plurality of support rods, adjacent support rods are arranged obliquely to each other, one end of each support rod is commonly connected to the wind turbine, and the other end is respectively connected to a buoy.

[0007] Furthermore, adjacent buoys are connected via connecting components.

[0008] Furthermore, the connection assembly includes a plurality of connection rods, and both ends of each connection rod are connected to a buoy, so that all the buoys are connected into a whole.

[0009] Furthermore, the anti-roll ring is an annular plate sleeved on the first column segment, and the outer diameter of the anti-roll ring is larger than the outer diameter of the first column segment.

[0010] Furthermore, a second column segment is provided at one end of the first conical segment away from the first column segment, and a diameter of the second column segment is equal to a size of a maximum diameter end of the first conical segment.

[0011] Furthermore, a second conical section is provided at one end of the second column section away from the first conical section, the second column section is connected to the end with the smaller diameter of the second conical section, and the diameter of the second column section is equal to the size of the smallest diameter end of the second conical section.

[0012] Furthermore, a lower floating body is provided on the buoy, and the lower floating body includes a plurality of floating plates, and both ends of each floating plate are connected to a buoy.

[0013] Furthermore, at least one buoy is provided with a mooring and anchoring member.

[0014] In order to achieve the above-mentioned objectives, in a second aspect, the present invention further provides a method for reducing the sway of a towerless semi-submersible anti-sway floating wind turbine platform, which adopts the following technical solutions: A method for reducing the roll of a towerless semi-submersible anti-roll floating wind turbine platform uses the towerless semi-submersible anti-roll floating wind turbine platform as described in the first aspect, including: reducing the area of ​​action of wind loads by disposing a first column section, and locating an anti-roll ring at the upper end of the waterplane to reduce the heave motion and pitch and roll motion of the floating body.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the minimum diameters of the first column section and the first conical section are equal, thereby reducing the effective area of ​​wind load; a roll-stabilizing ring is provided on the first column section, and the roll-stabilizing ring is located at the upper end of the waterline surface to reduce the heave motion and the pitch and roll motion of the floating body; when the wave force is relatively small, the roll-stabilizing ring can achieve a relatively good roll-stabilizing effect, and the first column section can reduce the wind load surface, thereby reducing the swaying motion caused by the wind load; and the first column section has a simple structure and is easy to design and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the specification of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions of this embodiment are used to explain this embodiment and do not constitute an improper limitation on this embodiment.

[0017] Figure 1 This is a schematic diagram of the platform structure of Example 1 of the present invention; Figure 2 This is a schematic diagram of the connection components of Example 1 of the present invention; Figure 3 This is a schematic diagram of the buoy structure of Example 1 of the present invention; Figure 4 Schematic diagram of platform stability according to Example 1 of the present invention; Figure 5 This is a graph showing the pitch comparison results of the tank test condition 1 of Example 1 of the present invention; Figure 6 This is a graph showing the acceleration comparison results of the water tank test condition 1 of Example 1 of the present invention; Figure 7 This is a graph showing the comparison of pitching results in the tank test condition 2 of Example 1 of the present invention; Figure 8 This is a graph showing the acceleration comparison results of the water tank test condition 2 of Example 1 of the present invention; Among them, 1. Wind turbine; 2. Support assembly; 3. Connection assembly; 4. Buoy; 401. First column section; 402. Anti-roll ring; 403. First conical section; 404. Second column section; 405. Second conical section; 5. Lower buoy; 6. Mooring; 7. Anchor. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0020] Example 1: As described in the background technology, the current column-structured buoy has a poor anti-rolling effect in the middle column section when the wave force is small, and the upper part of the dumbbell-shaped column is stepped with a larger diameter, which increases the wind-bearing surface, is not conducive to anti-rolling, and is difficult to manufacture. At the same time, the cost of floating wind power is relatively high.

[0021] In order to solve at least one of the above problems, Figure 1As shown, this embodiment provides a towerless, semi-submersible, anti-roll floating wind turbine platform. This novel structure can reduce the cost of floating wind turbines while also minimizing the sway and heave motions of the floating body. The configuration of support assemblies reduces the required ballast on the floating body, thereby reducing its size. Furthermore, the addition of a roll stabilizer ring and the use of stepped buoys enhance the platform's stability during slight tilts, thereby increasing the power generation of the floating wind turbine. The platform comprises a wind turbine 1, a support assembly 2, a connection assembly 3, buoys 4, a lower buoy 5, a mooring 6, and anchors 7.

[0022] like Figure 1 As shown, the wind turbine 1 is arranged on the buoy 4 through the support assembly 2; specifically, the support assembly 2 includes a plurality of support rods, adjacent support rods are arranged at an angle to each other, one end of each support rod is commonly connected to the wind turbine 1, and the other end is respectively connected to the buoy 4.

[0023] Through the arrangement of the above-mentioned multiple support rods, not only a reliable connection between the wind turbine 1 and the buoy 4 is achieved, but also the effective area of ​​the wind load is reduced, and the anti-rolling jump is improved; at the same time, the adjacent support rods are arranged at an angle to each other, which increases the distance between the multiple buoys 4, increases the effective area of ​​the multiple buoys 4, and further improves the stability.

[0024] like Figure 2 As shown, adjacent buoys 4 are connected via the connecting assembly 3. Specifically, the connecting assembly 3 includes a plurality of connecting rods, and both ends of each connecting rod are connected to a buoy 4, so that all buoys 4 are connected into a whole.

[0025] The connecting assembly 3 connects all the buoys 4 into a whole, avoiding the problem of excessive shaking of a single buoy 4 when subjected to large wind and waves; when a single buoy 4 is subjected to large wind and waves, the force can be decomposed through the connecting rod to improve the wave-resistant effect.

[0026] like Figure 1 and Figure 3 As shown, the buoy 4 includes a first column section 401 , a roll stabilizing ring 402 , a first tapered section 403 , a second column section 404 and a second tapered section 405 .

[0027] Since floating wind turbines face deep seas, where waves are larger, and the floating wind turbines themselves have six degrees of freedom, the buoys 4 in this embodiment are stepped buoys, with the top end being a first column section 401 of equal diameter. This structure can reduce the waterplane while ensuring ease of processing to reduce production costs. The anti-roll ring 402 is on the first column section 401 and is arranged at the upper end of the waterplane primarily to reduce the heave motion, pitch and roll motion, of the buoy. The first tapered section 403 is a positively tapered section that can reduce heave and lower the overall center of gravity. The lower end of the first tapered section 403 is connected to the lower buoy 5, which also serves to reduce heave. The lower end of the lower buoy 5 is the second tapered section 405, a section with a larger positive tapered angle that can shift the center of gravity of the entire buoy further downward, thereby improving the stability of the entire buoy.

[0028] One end of the first column section 401 is connected to the support assembly 2 , and the other end is connected to the smaller end of the first conical section 403 , with the first column section 403 and the first conical section 403 having the same minimum diameter. The anti-roll ring 402 is provided on the first column section 401 .

[0029] The minimum diameter of the first column section 403 is equal to that of the first conical section 403, thereby reducing the area where wind load acts. The first column section 401 is provided with the anti-roll ring 402, which is located at the upper end of the waterline to reduce the heave motion and pitch and roll motion of the floating body. When the wave force is small, the anti-roll ring 402 can achieve a better anti-roll effect. The first column section 401 can reduce the wind-exposed area and reduce the swaying motion caused by wind load. In addition, the first column section 401 has a simple structure and is easy to design and manufacture.

[0030] Optionally, the anti-roll ring 402 is an annular plate sleeved on the first column section 403, and the anti-roll ring 402 and the outer wall of the first column section 403 can be connected by welding or other means; the outer diameter of the anti-roll ring 402 is larger than the outer diameter of the first column section 403, so as to play a wave-resisting role against waves at the bottom of the anti-roll ring 402.

[0031] The first conical section 403 is set to lower the center of gravity of the entire platform and improve the stability of the platform; on this basis, a second column section 404 is set at the end of the first conical section 403 away from the first column section 401, and the diameter of the second column section 404 is equal to the size of the largest diameter end of the first conical section 403.

[0032] The arrangement of the second column section 404, in combination with the second column section 404, can reduce the waves impacting the buoy 4 and decompose them. On the basis of reducing the force of the waves themselves, the force of the waves on the bottom of the anti-roll ring 402 is reduced, thereby improving the anti-roll effect.

[0033] A second conical section 405 is provided at one end of the second column section 404 away from the first conical section 403. The second column section 404 is connected to the end of the second conical section 405 with a smaller diameter, and the diameter of the second column section 404 is equal to the size of the smallest diameter end of the second conical section 405.

[0034] The second tapered section 405 further lowers the center of gravity of the entire platform and improves platform stability. The second column section 404, the combination of the second column section 404 and the second tapered section 405 can further reduce the impact of waves on the buoy 4 and decompose them. In addition to reducing the force of the waves themselves, the force of the waves on the bottom of the anti-roll ring 402 is further reduced, thereby improving the anti-roll effect.

[0035] A lower floating body 5 is further provided between adjacent buoys 4 ; specifically, the lower floating body 5 includes a plurality of floating plates, both ends of each floating plate are connected to a buoy 4 , and the floating plates can be connected to the second column section 404 .

[0036] The arrangement of the lower buoyancy body 5 further improves the overall stability among the plurality of buoys 4, and the arrangement of the lower buoyancy body 5 further reduces the wave force, thereby improving the wave resistance and roll reduction effects.

[0037] At least one buoy 4 is provided with a mooring 6 and an anchor 7. Optionally, the support assembly 2 includes three support rods: a first support rod and a second support rod are arranged perpendicular to the wind turbine 1 and in a vertical plane; the first and second support rods are inclined relative to each other in the vertical plane; and a third support rod is arranged at an angle relative to the vertical plane. The buoy 4 connected to the third support rod is provided with a mooring 6 and an anchor 7. The provision of the mooring 6 and anchor 7 further improves platform stability.

[0038] When the floating body is affected by the coupling of wind, waves and current, it will sway to a certain extent, so the stability needs to be checked. Figure 4 This is the force diagram for a platform that is slightly tilted ϕ by an external force. The waterline changes from W0L0 to W1L1, and the center of buoyancy moves from B0 to B. At this time, the displacement △ and the position of the center of gravity G remain unchanged. The gravity and buoyancy no longer act on the same plumb line, thus generating a moment called the restoring moment Ms. The intersection point M of the front and rear buoyancy lines is called the metacenter, which can be expressed by the following formula: ; ; ; in, is the platform displacement; Height of metacenter from baseline; is the height of the center of gravity from the baseline; Load weights for each section; Loading levels for each section.

[0039] Placing the anti-roll ring 402 near the waterline can make the buoyancy distribution in the horizontal direction more dispersed, obtain greater buoyancy when tilting occurs, and effectively increase the metacentric height from the baseline, increase the restoring moment KM when a small tilt occurs, and suppress the platform tilt.

[0040] In this embodiment, the traditional tower is not used as the supporting structure of the unit. Figure 2 Instead, three support rods are used to connect the three buoys 4. This design can achieve a more balanced center of gravity, require less ballast, reduce the buoyancy required for the float, and thus reduce the weight of the float. The support structure can be in the form of an airfoil, a cylinder, or a diagonal brace.

[0041] The use of a single-point mooring system 6 at the lower part enables the entire wind turbine 1 to automatically respond to waves and currents. Unlike other single-point mooring systems, which respond to the combined forces of wind, waves and currents, it does not include an active yaw system, which will cause a small angle between the rotor surface and the wind. This solution still includes an active yaw system on this basis, but due to the limitation of the support components, the yaw system is controlled to yaw within a range of 30 degrees, which can effectively compensate for the angle between the rotor surface and the wind.

[0042] like Figures 5 to 8 To verify the effect of the anti-roll coil 402 and its combination with other structures, this embodiment uses experimental comparisons under two working conditions to verify the stability of the detection signal when the anti-roll coil 402 is added, which can illustrate the contribution of the anti-roll coil 402 to the stability of the platform. Specific working condition parameters are shown in Table 1: Table 1 Working parameters

[0043] In summary, this embodiment can effectively reduce the heave and sway motions of the floating body, significantly reduce the cost of the floating wind turbine equipment, and improve the power generation efficiency of the floating wind turbine equipment.

[0044] In some embodiments, the shape of the support assembly 2, the size of the wind turbine 1, the thickness and size of the anti-roll ring 402, the slope and diameter of the tapered section in the buoy 4 can be variably set according to actual conditions.

[0045] Example 2: This embodiment provides a method for reducing the roll of a towerless semi-submersible anti-roll floating wind turbine platform, using the towerless semi-submersible anti-roll floating wind turbine platform described in Example 1. The method includes: reducing the area where wind loads act by disposing a first column section 401, and reducing the heave, pitch, and roll motions of the floating body by locating an anti-roll ring 402 at the upper end of the waterplane.

[0046] The above description is merely a preferred embodiment of this embodiment and is not intended to limit this embodiment. Those skilled in the art will readily appreciate that this embodiment may be modified and varied in various ways. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this embodiment shall be within the scope of protection of this embodiment.

Claims

1. A towerless semi-submersible anti-roll floating wind turbine platform, characterized in that: It includes a fan and a buoy arranged at the lower part of the fan; the buoy includes a first column section close to one end of the fan, and a first conical section arranged at one end of the first column section away from the fan; The minimum diameters of the first column section and the first conical section are equal, reducing the area where wind load acts; a roll reduction ring is provided on the first column section, and the roll reduction ring is located at the upper end of the waterline to reduce the heave motion and pitch and roll motion of the floating body.

2. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: The fan is arranged on the buoy through a support assembly; the support assembly includes a plurality of support rods, adjacent support rods are arranged obliquely to each other, one end of each support rod is commonly connected to the fan, and the other end is respectively connected to a buoy.

3. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: Adjacent buoys are connected via connecting components.

4. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 3, characterized in that: The connecting assembly includes a plurality of connecting rods, and both ends of each connecting rod are respectively connected to a buoy, so that all the buoys are connected into a whole.

5. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: The anti-roll ring is an annular plate sleeved on the first column segment, and the outer diameter of the anti-roll ring is greater than the outer diameter of the first column segment.

6. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: A second column segment is provided at one end of the first conical segment away from the first column segment, and a diameter of the second column segment is equal to a size of a maximum diameter end of the first conical segment.

7. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 6, characterized in that: A second conical section is provided at one end of the second column section away from the first conical section. The second column section is connected to the end with the smaller diameter of the second conical section. The diameter of the second column section is equal to the smallest diameter end of the second conical section.

8. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: A lower floating body is also provided on the buoy. The lower floating body includes a plurality of floating plates. Both ends of each floating plate are connected to a buoy.

9. The towerless semi-submersible anti-roll floating wind turbine platform according to claim 1, characterized in that: At least one buoy is provided with mooring and anchoring means.

10. A method for reducing the sway of a semi-submersible floating wind turbine platform without a tower, characterized in that: A towerless semi-submersible anti-roll floating wind turbine platform as described in any one of Examples 1-9 is used, including: reducing the area of ​​action of wind loads by setting a first column section, and locating the anti-roll ring at the upper end of the waterline to reduce the heave motion and pitch and roll motion of the floating body.

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