Outer turret type single-point mooring system of double-impeller wind turbine generator

Abstract

The invention relates to the field of offshore wind power generation, in particular to a double-impeller wind turbine generator external turret type single-point mooring system which comprises a floating type foundation, a first wind turbine generator, a second wind turbine generator and a single-point mooring device. The first wind turbine generator and the second wind turbine generator are separately mounted at the top of the V-shaped support, a lower floating box is arranged at the bottom of the main stand column, the single-point mooring device comprises an outer rotating tower, a main bearing, an anchor chain disc and an anchor chain, an outer extending column is arranged at the upper end of the main stand column, a mounting groove is formed in the end, away from the main stand column, of the outer extending column, and the outer rotating tower is arranged in the mounting groove. The anchor chain disc is fixedly connected with the bottom of the outer turret, one end of the anchor chain is connected with the anchor chain disc, the other end of the anchor chain is fixed to the seabed, an inner ring of the main bearing is connected with the outer turret, an outer ring is connected with the inner wall of the mounting groove, and the outer turret and the main bearing are located above the seawater plane. The floating type foundation can rotate around the mooring point, a unit yaw system is omitted, and the fault rate of a unit is reduced.

Description

Technical Field

[0001] This application relates to the field of offshore wind power generation, and in particular to a single-point mooring system for a dual-blade wind turbine with an external turret. Background Technology

[0002] Currently, wind power development is gradually moving towards deep-sea areas, and the development of wind turbine units is also gradually moving towards large-scale. The current development of deep-sea floating wind power technology mainly aims to solve the problem of meeting commercial operation requirements, which mainly includes breakthroughs in three major technologies: the wind turbine unit itself, the floating foundation, and the mooring system.

[0003] Currently, there are two main types of ultra-large deep-sea floating wind turbines of 25MW and above. One type is the conventional single-unit type, where one unit is paired with one floating foundation. For single-unit floating wind turbines, the yaw system acts as a servo system for the wind turbine generator. By adjusting the rotor orientation, it keeps the wind turbine facing the wind direction at all times to capture maximum wind energy. This is basically achieved by arranging a certain number of yaw drives at the top of the tower to drive the unit to rotate around the tower.

[0004] Another approach is to split the power of a single turbine into two units, with the two units sharing a single floating foundation. With this structure, it is impossible to install a corresponding yaw system on the top of the turbine tower to achieve wind alignment, otherwise the two turbine structures will interfere with each other. It is necessary to consider the overall yaw alignment with the floating foundation. Currently, there are no relevant products or solutions in the industry for the structure of floating wind power single-point mooring systems. Summary of the Invention

[0005] To address the yaw and wind-related issues of dual-rotor wind turbine units on floating foundations, this application provides a single-point mooring system for external turrets of dual-rotor wind turbine units.

[0006] The technical solution provided in this application for a single-point mooring system for an external turret of a dual-blade wind turbine generator is as follows: A single-point mooring system for a dual-rotor wind turbine with an external turret includes a floating foundation, a first wind turbine, a second wind turbine, and a single-point mooring device. The floating foundation includes a main column and a V-shaped support located on one side of the main column. The V-shaped support is connected to the main column. The first and second wind turbines are separately installed on the top of the V-shaped support. A lower buoy box is provided at the bottom of the main column. The single-point mooring device includes an external turret, a main bearing, an anchor chain disc, and an anchor chain. An external extension column is provided on the upper end of the main column away from the V-shaped support. The end of the external extension column away from the main column has an installation groove. The external turret is located in the installation groove. The anchor chain disc is fixedly connected to the bottom of the external turret. One end of the anchor chain is connected to the anchor chain disc, and the other end is fixed to the seabed. The inner ring of the main bearing is connected to the external turret, and the outer ring is connected to the inner wall of the installation groove. The external turret and the main bearing are located above the sea level.

[0007] Preferably, the inner wall of the mounting groove is provided with a turret support ring, and the outer ring of the main bearing is connected to the turret support ring.

[0008] Preferably, the bottom of the anchor chain disc is provided with a chain stopper for fixing the anchor chain, and the anchor chain disc is provided with an anchor chain puller above the chain stopper. The anchor chain puller is connected to the anchor chain for tensioning the anchor chain.

[0009] Preferably, the V-shaped support includes a first column and a second column, which are arranged in a V-shape with the main column as the center of symmetry. The first wind turbine is installed on the top of the first column, and the second wind turbine is installed on the top of the second column.

[0010] Preferably, a first crossbeam is provided between the first column and the main column, a second crossbeam is provided between the second column and the main column, and a reinforcing crossbeam connects the first column and the second column. The first crossbeam, the second crossbeam, the reinforcing crossbeam, the first column, and the second column are all hollow structures.

[0011] Preferably, the main column contains a component assembly. The turbine cable of the first wind turbine passes through the first crossbeam and extends into the main column to connect with the component assembly. The turbine cable of the second wind turbine passes through the second crossbeam and extends into the main column to connect with the component assembly. A booster main cable is led out from the component assembly. A slip ring is provided in the mounting groove. The outer rotating ring of the slip ring is fixedly connected to the inner wall of the mounting groove, and the inner fixed ring of the slip ring is fixedly connected to the top of the outer turret. The end of the booster main cable away from the component assembly is connected to the slip ring. A slip ring main cable is led out from the slip ring. The bottom of the anchor chain disc has a cable outlet for the slip ring main cable to pass through.

[0012] Preferably, the first crossbeam and the second crossbeam are located in the same horizontal plane and are arranged in a V-shape in the horizontal plane. The reinforcing crossbeam is horizontally arranged and located below the first crossbeam and the second crossbeam.

[0013] Preferably, in the frontal projection plane, the first column and the second column are arranged in a V-shape with the main column as the center, and the first column and the second column form an acute angle β with the horizontal plane.

[0014] Preferably, in the side-view projection plane, the main column is vertically arranged, and both the first column and the second column are inclined towards the main column. The first column and the second column are in the same inclined plane and form an acute angle α with the vertical plane.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a single-point mooring point on one side of the main column of the floating foundation through the extension column, the main columns of the floating foundation, the first wind turbine, and the second wind turbine can rotate relative to each other around the outer turret at the end of the extension column. This allows the entire floating foundation to rotate relative to each other around a single point under the combined action of wind and waves, achieving free wind resistance. This eliminates the need for the entire unit's yaw system and related controls, significantly improving product reliability. Furthermore, the use of the extension column allows the outer turret to be prefabricated independently, reducing the overall construction difficulty. Since the mooring point of the outer turret floats above the waterline and is not submerged in seawater, the problems of processing large-size bearings and sealing the main bearings are avoided. In addition, the anchor point of the anchor chain is further away from the unit, making the wind vane effect more obvious.

[0016] 2. For the three-column floating foundation used in the dual-rotor floating wind power generation system, the buoyancy of the entire floating foundation is provided by the buoyancy box under the main column and the reinforcing crossbeam. The connection between the three columns is established through the first crossbeam and the second crossbeam. The power of the unit is transmitted through the component area of ​​the upper platform of the main column, and then through the outer extension column to the slip ring. The slip ring has the function of relative rotational power transmission, which ensures that the step-up main cable transmitted from the rotating floating foundation is transmitted to the outer turret in the stationary state. The power transmission of the slip ring is transmitted to the fixed dynamic submarine cable outlet through the step-up main cable of the slip ring. Thus, the power transmission channel in the single-point mooring state is formed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the external turret single-point mooring system for a dual-blade wind turbine according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the main structure of the external turret single-point mooring system for a dual-blade wind turbine according to an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the single-point mooring device in an embodiment of this application.

[0020] Figure 4 This is a schematic diagram showing the connection relationship between the main bearing, turret support ring, and anchor chain disc in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the arrangement of the outer extension column, main column, and V-shaped bracket in the embodiments of this application.

[0022] Figure 6 This is a schematic diagram of the floating foundation and its internal cables in an embodiment of this application.

[0023] Explanation of reference numerals in the attached drawings: 1. First wind turbine; 11. Support tower; 2. Second wind turbine; 3. Single-point mooring device; 31. Outer turret; 32. Main bearing; 33. Anchor chain disc; 34. Anchor chain; 35. Chain stopper; 4. Main column; 41. Lower buoy box; 42. Outer extension column; 43. Mounting slot; 44. Turret support ring; 45. Cable outlet; 5. V-shaped bracket; 51. First column; 52. Second column; 53. First crossbeam; 54. Second crossbeam; 55. Reinforcing crossbeam; 6. Seawater level; 7. Component assembly; 71. Converter; 72. Transformer; 73. Ring main unit; 8. Slip ring; 91. Unit cable; 92. Step-up main cable; 93. Slip ring main cable. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0025] The directional terms such as "up," "down," "left," "right," "front," and "back" used in this application only represent relative positions in the diagram and are used for the convenience of describing this application. They do not represent the absolute position of the product and should not be regarded as limitations on this application.

[0026] This application discloses an external turret single-point mooring system for a dual-blade wind turbine.

[0027] like Figure 1 and Figure 2 As shown, the dual-rotor wind turbine external turret single-point mooring system of this embodiment includes a floating foundation, a first wind turbine 1, a second wind turbine 2, and a single-point mooring device 3. The floating foundation includes a main column 4 and a V-shaped support 5 located on one side of the main column 4. The V-shaped support 5 is connected to the main column 4. A lower floating box 41 is provided at the bottom of the main column 4. The first wind turbine 1 and the second wind turbine 2 are separately installed on the top of the V-shaped support 5.

[0028] like Figure 3 and Figure 4 As shown, the single-point mooring device 3 includes an outer turret 31, a main bearing 32, an anchor chain disc 33, and an anchor chain 34. An outer extension column 42 is located at the upper end of the main column 4, with the outer extension column 42 and V-shaped support 5 positioned on opposite sides of the main column 4. The end of the outer extension column 42 furthest from the main column 4 has a mounting groove 43, with its opening facing downwards. The outer turret 31 is located within the mounting groove 43. The main bearing 32 is mounted on the inner wall of the mounting groove 43 and connected to the outer turret 31. The inner ring of the main bearing 32 is connected to the outer turret 31, and its outer ring is connected to the inner wall of the mounting groove 43. The anchor chain disc 33 is fixedly connected to the bottom of the outer turret 31. One end of the anchor chain 34 is connected to the anchor chain disc 33, and the other end is fixed to the seabed. This floating foundation rotates relative to the outer turret 31 via the outer extension column 42 and the outer ring of the main bearing 32.

[0029] In operation, the floating foundation floats above the waterline 6, with the outer extension column 42 above the waterline, ensuring that the outer turret 31 and main bearing 32 are positioned above the waterline 6. Anchor chains 34, connected to the seabed, tighten the anchor chain disc 33. The lower buoy 41 at the bottom of the main column 4 provides buoyancy to the foundation. The sinking force of the V-shaped support 5 on the other side of the main column 4 is balanced by the tension of the anchor chain 34 on the side of the outer extension column 42. The entire floating wind turbine is secured by the anchor chain at a single mooring point, ensuring that the foundation does not shift due to waves or wind. See also Figure 2 In the diagram, arrow k indicates the wind direction (headwind). Facing the wind, the mooring point is in front of the first wind turbine (unit 1) and the second wind turbine (unit 2). When the wind blows towards the two turbines, the turbine blades experience a thrust F from the wind. 推 The mooring point will exert a tensile force F on the floating foundation. 拉 Due to the change in blade angle between the two wind turbines, the magnitude and direction of the thrust experienced by the two turbines differ. This causes the floating foundations at the bottom of the two turbines to rotate, with the single-point mooring outer turret 31 as the center of rotation. When the first wind turbine 1 experiences greater force, it will swing towards the second wind turbine 2; conversely, when the second wind turbine 2 experiences greater force, it will swing towards the first wind turbine 1. After this rotational swinging, the first wind turbine 1 and the second wind turbine 2 are adjusted to suitable positions, so that the sum of their forces equals the thrust F of the wind. 推 Equal and on the same straight line At this point, the two wind turbines have completed their yaw alignment and will no longer sway left and right. The entire floating foundation stops rotating relative to the mooring point, thus enabling the two wind turbines to freely align with the wind. After the two wind turbines are freely aligned with the wind, their blades will rotate normally to generate electricity.

[0030] Under the combined action of wind and waves, the entire floating foundation yaws and aligns with the wind by rotating around the outer turret 31 of the single-point mooring device via the main column 4, the outer extension column 42, and the outer ring of the main bearing 32. This active wind-fighting, achieved by combining wind direction with wave action, allows for free wind alignment between the two wind turbines, eliminating the need for an active yaw system in the wind turbines and reducing their failure rate. Simultaneously, the use of the outer extension column 42 allows for independent prefabrication of the outer turret 31, reducing overall construction difficulty. Since the mooring point of the outer turret 31 floats above the waterline and is not submerged, the challenges of machining large bearings and sealing the main bearing are avoided. Furthermore, the anchor point of the anchor chain is further away from the turbine (the anchor chain disc is raised above the waterline 6, detached from the seawater), resulting in a more pronounced wind vane effect. This increases the height of the mooring point and the seabed, leading to a more significant sag effect on the catenary mooring cable, making it easier to arrange the mooring cable configuration and providing higher restoring stiffness. If a single-point mooring structure is set at the bottom of the main column 4 and the lower floating box, the rotating structure needs to be set inside the floating body. This requires reserving space inside the floating body and strengthening the structure, which not only increases the space of the floating body but also increases the material consumption and makes the manufacturing process more complicated. Furthermore, since the mooring point is at the bottom of the floating body, the distance between the mooring point and the seabed is short, which makes the design configuration of the mooring cable more complicated.

[0031] In this embodiment, the outer extension column 42 is a hollow structure, welded to the circumferential sidewall of the main column 4. The end of the outer extension column 42 away from the main column 4 is closed, and the mounting groove 43 is provided on the outer wall near this end, with the groove opening facing vertically downwards. To facilitate the connection between the main bearing 32 and the outer extension column 42, a turret support ring 44 is fixedly welded (or integrally formed) on the inner wall of the mounting groove 43, and the outer ring of the main bearing 32 is connected to the turret support ring 44. The structure of the outer extension column 42 can be segmented and welded on-site without the need for a dry dock, greatly reducing dependence on a dry dock.

[0032] In this embodiment, a chain stopper 35 is provided at the bottom of the anchor chain disc 33, which is used to fix the anchor chain 34. An anchor chain puller (not shown in the figure) is provided above the chain stopper 35 on the anchor chain disc 33. The anchor chain puller is connected to the anchor chain 34 and is used to tension the anchor chain 34 to prevent the anchor chain 34 from becoming loose during long-term operation.

[0033] In this embodiment, the V-shaped support 5 includes a first column 51 and a second column 52, which are arranged in a V-shape with the main column 4 as the center of symmetry. The first wind turbine 1 is installed on the top of the first column 51, and the second wind turbine 2 is installed on the top of the second column 52. A reinforcing beam 55 connects the first column 51 and the second column 52. The reinforcing beam 55 is located at the bottom of the V-shaped support 5. The main column 4, the reinforcing beam 55, the first column 51, and the second column 52 are all hollow structures. This floating foundation is mainly a three-column floating foundation composed of the first column 51, the second column 52, and the main column 4. The lower buoyancy box 41 and the reinforcing beam 55 are completely submerged in seawater. The lower parts of the first column 51, the second column 52, and the main column 4 are submerged in seawater. The buoyancy of the entire floating foundation is mainly provided by the lower buoyancy box 41 and the hollow reinforcing beam 55. A first crossbeam 53 is provided between the first column 51 and the main column 4, and a second crossbeam 54 is provided between the second column 52 and the main column 4. The first crossbeam 53 and the second crossbeam 54 connect the V-shaped support 5 and the main column 4. Both the first crossbeam 53 and the second crossbeam 54 are hollow structures to reduce the overall weight of the foundation. The first crossbeam 53 and the second crossbeam 54 are located in the same horizontal plane and are arranged in a V-shape in the horizontal plane. The reinforcing crossbeam 55 is set horizontally. The first crossbeam 53 and the second crossbeam 54 are located above the sea level 6, and the reinforcing crossbeam 55 is located below the sea level 6.

[0034] like Figure 5 and Figure 6 As shown, in this embodiment, a component group 7 is provided at the upper end of the main column 4. The component group 7 mainly includes a converter 71, a transformer 72, and a ring main unit 73. The turbine cable 91 of the first wind turbine 1 passes through the first crossbeam 53 and extends into the main column 4, and is connected to the converter 71, transformer 72, and ring main unit 73 in sequence. The turbine cable 91 of the second wind turbine 2 passes through the second crossbeam 54 and extends into the main column 4, and is also connected to the converter 71, transformer 72, and ring main unit 73 in sequence. The interior of the main column 4 is connected to the interior of the outer extension column 42. A slip ring 8 is provided in the mounting groove 43 of the outer extension column. The rotating outer ring of the slip ring 8 is fixedly connected to the inner wall of the mounting groove 43, and the fixed inner ring of the slip ring 8 is fixedly connected to the top of the outer turret 31. Figure 3As shown, the cables 91 of the two units converge after being connected to the component group 7, and the main booster cable 92 is uniformly led out by the ring main unit 73. The main booster cable 92 passes through the outer extension column 42 and connects to the rotating outer ring of the slip ring 8. The main slip ring cable 93 is led out from the fixed inner ring of the slip ring 8. The bottom of the anchor chain disc 33 is provided with a cable outlet 45, through which the main slip ring cable 93 passes. When the floating foundation rotates, the main booster cable 92 rotates with the main column 4 and the rotating outer ring of the slip ring 8, while the fixed inner ring of the slip ring 8 and the outer turret 31 remain stationary. Therefore, the main slip ring cable 93 remains stationary. The conductive brush head inside the slip ring 8 enables the rotating main booster cable 92 to be electrically connected to the stationary main slip ring cable 93. The power of the unit is transferred to the cable outlet 45 through the slip ring 8, thus forming the power transmission in the single-point mooring state.

[0035] like Figure 1 and Figure 2 As shown, in this embodiment, in the frontal projection plane, the first column 51 and the second column 52 are arranged in a V-shape with the main column 4 as the center. The first column 51 and the horizontal plane form an acute angle β, and the second column 52 and the horizontal plane also form an acute angle β. In this embodiment, in the side projection plane, the main column 4 is vertically arranged, and both the first column 51 and the second column 52 are inclined towards the main column 4. The first column 51 and the second column 52 are in the same inclined plane and form an acute angle α with the vertical plane. In this embodiment, the first wind turbine 1 is mounted on the first column 51 through a support tower 11, and the first column 51 and the support tower 11 are collinear; similarly, the second wind turbine 2 is mounted on the second column 52 through the support tower 11, and the second column 52 and the support tower 11 are collinear. In the frontal projection plane, the first column 51 and the second column 52 are arranged in a V-shape with the main column 4 as the center. The first column 51 and the horizontal plane form an acute angle β, and the second column 52 also form an acute angle β with the horizontal plane. This means the two supporting towers 11 are tilted outwards, which reduces the horizontal distance between the foundations of the two unit towers. In the side projection plane, the main column 4 is vertically set, and both the first column 51 and the second column 52 are tilted towards the main column 4. The first column 51 and the second column 52 are in the same inclined plane and form an acute angle α with the vertical plane. This means the two supporting towers 11 are tilted forward, increasing the distance between the blade tips and the tower (the blade tips are closer to the tower when vertical), avoiding the risk of collision (tower sweep) between the conventional vertical tower and the tower due to blade deformation under load. It also helps control the center of gravity, making the overall platform more stable. β and α are values ​​between 0 and 90°.

[0036] The implementation principle of the dual-blade wind turbine external turret single-point mooring system in this embodiment is as follows: In use, the floating foundation is located on the sea surface and is fixed to the seabed by anchor chains 34. The lower buoy 41 and reinforcing beam 55 are submerged in the seawater (below the waterline 6), while the first beam 53 and the second beam 54 are above the waterline 6. The first wind turbine 1 and the second wind turbine 2 are upwind units, facing the wind. When waves act on the floating foundation, each wind turbine, the first column 51, the second column 52, and the main column 4 rotate around the outer turret 31 via the outer ring of the main bearing 32, allowing the first wind turbine 1 and the second wind turbine 2 to freely face the wind. The entire floating wind turbine is secured by anchor chains with single-point mooring, ensuring that the foundation does not shift due to waves or wind. The turbine cables 91 of the two units emerge from the first column 51 and the second column 52 respectively and pass through the first beam. 53 and the second crossbeam 54 enter the main column 4, connect to the component group 7, and then lead out the booster main cable 92. The booster main cable 92 enters the outer extension column 42 and connects to the slip ring 8. The slip ring main cable 93 is led out from the slip ring 8 and finally leads out from the cable outlet 45 at the bottom of the anchor chain disc 33. The booster main cable 92, which rotates through the slip ring 8, is electrically connected to the stationary slip ring main cable 93, so that the power of the wind turbine is led out from the cable outlet 45 of the floating foundation, forming the power transmission in the single-point mooring state, ensuring that the dynamic cable used for power transmission at the unit end is sent out through the mooring point.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-point mooring system for an external turret of a dual-blade wind turbine, characterized in that: The system includes a floating foundation, a first wind turbine (1), a second wind turbine (2), and a single-point mooring device (3). The floating foundation includes a main column (4) and a V-shaped support (5) located on one side of the main column (4). The V-shaped support (5) is connected to the main column (4). The first wind turbine (1) and the second wind turbine (2) are separately installed on the top of the V-shaped support (5). A lower buoy box (41) is provided at the bottom of the main column (4). The single-point mooring device (3) includes an outer turret (31), a main bearing (32), an anchor chain disc (33), and an anchor chain (34). The main column ( 4) An outer extension column (42) is provided on the side away from the V-shaped support (5) at the upper end. The end of the outer extension column (42) away from the main column (4) has an installation groove (43). The outer turret (31) is located in the installation groove (43). The anchor chain disc (33) is fixedly connected to the bottom of the outer turret (31). One end of the anchor chain (34) is connected to the anchor chain disc (33), and the other end is fixed to the seabed. The inner ring of the main bearing (32) is connected to the outer turret (31), and the outer ring is connected to the inner wall of the installation groove (43). The outer turret (31) and the main bearing (32) are located above the sea level (6).

2. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 1, characterized in that: The inner wall of the mounting groove (43) is provided with a turret support ring (44), and the outer ring of the main bearing (32) is connected to the turret support ring (44).

3. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 1, characterized in that: The bottom of the anchor chain disc (33) is provided with a chain stopper (35) for fixing the anchor chain (34). The anchor chain disc (33) is provided with an anchor chain lifter above the chain stopper (35). The anchor chain lifter is connected to the anchor chain (34) for tensioning the anchor chain (34).

4. The single-point mooring system for the external turret of a dual-blade wind turbine according to any one of claims 1 to 3, characterized in that: The V-shaped support (5) includes a first column (51) and a second column (52). The first column (51) and the second column (52) are arranged in a V-shape with the main column (4) as the center of symmetry. The first wind turbine (1) is installed on the top of the first column (51), and the second wind turbine (2) is installed on the top of the second column (52).

5. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 4, characterized in that: A first crossbeam (53) is provided between the first column (51) and the main column (4), and a second crossbeam (54) is provided between the second column (52) and the main column (4). A reinforcing crossbeam (55) connects the first column (51) and the second column (52). The first crossbeam (53), the second crossbeam (54), the reinforcing crossbeam (55), the first column (51), and the second column (52) are all hollow structures.

6. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 5, characterized in that: The main column (4) is equipped with a component group (7). The unit cable (91) of the first wind turbine (1) passes through the first crossbeam (53) and extends into the main column (4) to connect with the component group (7). The unit cable (91) of the second wind turbine (2) passes through the second crossbeam (54) and extends into the main column (4) to connect with the component group (7). The component group (7) has a booster main cable (92) leading out. The mounting groove (43) is equipped with a slip ring (8). The outer rotating ring of the slip ring (8) is fixedly connected to the inner wall of the mounting groove (43). The inner fixed ring of the slip ring (8) is fixedly connected to the top of the outer turret (31). The end of the booster main cable (92) away from the component group (7) is connected to the slip ring (8). The slip ring (8) has a slip ring main cable (93) leading out. The bottom of the anchor chain disc (33) is provided with a cable outlet (45) for the slip ring main cable (93) to pass through.

7. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 5, characterized in that: The first crossbeam (53) and the second crossbeam (54) are located in the same horizontal plane and are arranged in a V-shape in the horizontal plane. The reinforcing crossbeam (55) is horizontally arranged and located below the first crossbeam (53) and the second crossbeam (54).

8. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 4, characterized in that: In the frontal projection plane, the first column (51) and the second column (52) are arranged in a V-shape with the main column (4) as the center. The first column (51) forms an acute angle β with the horizontal plane, and the second column (52) forms an acute angle β with the horizontal plane.

9. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 4, characterized in that: In the side view projection plane, the main column (4) is vertically set, and the first column (51) and the second column (52) are both inclined toward the main column (4). The first column (51) and the second column (52) are in the same inclined plane and form an acute angle α with the vertical plane.

Images