Double-impeller wind turbine outer rotating tower type single point mooring system

Abstract

The application relates to the field of offshore wind power generation, in particular to a double-impeller wind turbine outer rotating tower type single-point mooring system which comprises a floating foundation, a first wind turbine, a second wind turbine and a single-point mooring device, the floating foundation comprises a main stand and a V-shaped support, the first wind turbine and the second wind turbine are separately installed on the top of the V-shaped support, the bottom of the main stand is provided with a lower floating box, the single-point mooring device comprises an outer rotating tower, a main bearing, an anchor chain disc and an anchor chain, the upper end of the main stand is provided with an outer extension column, the end of the outer extension column away from the main stand is provided with a mounting groove, the outer rotating tower is arranged in the mounting groove, the anchor chain disc is fixedly connected with the bottom of the outer rotating tower, one end of the anchor chain is connected with the anchor chain disc, and the other end is fixed with a seabed, the inner ring of the main bearing is connected with the outer rotating tower, and the outer ring is connected with the inner wall of the mounting groove, and the outer rotating tower and the main bearing are located above the waterline of seawater. The floating foundation of the application can rotate around the mooring point, the unit yawing system is cancelled, and the unit failure rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of offshore wind power generation, in particular to a double-impeller wind turbine outer rotating tower type single-point mooring system. BACKGROUND

[0002] Currently, the wind power development sea area gradually moves towards the deep sea, and the development of wind turbine also gradually moves towards large-scale. The current development of deep sea floating wind power technology mainly aims to solve the problem of commercial operation, which mainly includes the breakthrough of three technologies of wind turbine itself, floating foundation and mooring system.

[0003] Currently, there are two types of 25MW and above super large deep sea floating units, one is a conventional single unit, that is, one unit is equipped with one floating foundation. For single unit floating unit, the wind turbine yaw system as a servo system of wind turbine generator, adjusts the position of impeller to keep the wind turbine always facing the wind direction to capture the maximum wind energy. The yaw drive is basically arranged on the top of the tower, which drives the unit to rotate around the tower.

[0004] The other is to split the power of single unit into two, and adopt two units sharing one floating foundation. For this structure, two units cannot be arranged with corresponding yaw system on the top of the unit tower to realize the wind-against of wind turbine, otherwise the structure of two wind turbines will interfere, and the yaw against wind of the whole floating foundation needs to be considered. Currently, there is no related product and scheme about the structure of floating wind power single-point mooring system in the industry. SUMMARY

[0005] In order to solve the problem of yaw against wind of double-impeller unit on floating foundation, the present application provides a double-impeller wind turbine outer rotating tower type single-point mooring system.

[0006] The double-impeller wind turbine outer rotating tower type single-point mooring system provided by the present application adopts the following technical scheme:

[0007] The application discloses a double-impeller wind turbine outer rotating tower type single-point mooring system, which comprises a floating foundation, a first wind turbine, a second wind turbine and a single-point mooring device, the floating foundation comprises a main column and a V-shaped support located on one side of the main column, the V-shaped support is connected with the main column, the first wind turbine and the second wind turbine are separately installed on the top of the V-shaped support, the bottom of the main column is provided with a lower floating box, the single-point mooring device comprises an outer rotating tower, a main bearing, an anchor chain disc and an anchor chain, the upper end of the main column is provided with an outer extension column away from the side of the V-shaped support, the end of the outer extension column away from the main column is provided with a mounting groove, the outer rotating tower is arranged in the mounting groove, the anchor chain disc is fixedly connected with the bottom of the outer rotating tower, one end of the anchor chain is connected with the anchor chain disc, and the other end is fixed with a seabed, the inner ring of the main bearing is connected with the outer rotating tower, and the outer ring is connected with the inner wall of the mounting groove, and the outer rotating tower and the main bearing are located above the waterline of seawater.

[0008] Preferably, the inner wall of the mounting groove is provided with a rotating tower support ring, and the outer ring of the main bearing is connected with the rotating tower support ring.

[0009] Preferably, the bottom of the anchor chain disc is provided with a chain stopper for fixing the anchor chain, the anchor chain disc is provided with an anchor chain puller above the chain stopper, the anchor chain puller is connected with the anchor chain and is used for tensioning the anchor chain.

[0010] Preferably, the V-shaped support comprises a first column and a second column, the first column and the second column 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.

[0011] Preferably, the first column and the main column are provided with a first cross beam, the second column and the main column are provided with a second cross beam, and the first column and the second column are connected with a reinforcing cross beam, and the first cross beam, the second cross beam, the reinforcing cross beam, the first column and the second column are all hollow structures.

[0012] Preferably, the main column is internally provided with a component group, the unit cable of the first wind turbine passes through the first cross beam and extends into the main column to be connected with the component group, the unit cable of the second wind turbine passes through the second cross beam and extends into the main column to be connected with the component group, the component group is led out with a main voltage boosting cable, the mounting groove is internally provided with a slip ring, the rotating outer ring of the slip ring is fixedly connected with the inner wall of the mounting groove, the fixed inner ring of the slip ring is fixedly connected with the top of the outer rotating tower, one end of the main voltage boosting cable away from the component group is connected with the slip ring, the slip ring is led out with a main cable of the slip ring, and the bottom of the anchor chain disc is provided with a cable outlet for the main cable of the slip ring to pass out.

[0013] Preferably, the first cross beam and the second cross beam are located in the same horizontal plane and are arranged in a V shape in the horizontal plane, and the reinforcing cross beam is horizontally arranged and located below the first cross beam and the second cross beam.

[0014] Preferably, in the front projection plane, the first and second columns are arranged in a V shape with the main column as the center, the first column forms an acute angle β with the horizontal plane, and the second column forms an acute angle β with the horizontal plane.

[0015] Preferably, in the side projection plane, the main column is vertically arranged, the first and second columns are both inclined to the main column, the first and second columns are in the same inclined plane, and form an acute angle α with the vertical plane.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. By extending the column on one side of the main column of the floating foundation to set a single-point mooring point, the floating foundation, the first wind turbine, and the second wind turbine main column rotate around the outer turret at the end of the extended column, so that the entire floating foundation rotates around a point under the combined action of wind and waves, achieving free wind alignment. This can cancel the entire unit yaw system and related control, greatly improving the reliability of the product. The use of the extended column allows the outer turret to be prefabricated independently, reducing the overall construction difficulty. Since the mooring point of the outer turret is floating above the waterline and not submerged in seawater, the problem of large-size bearing machining and difficult main bearing sealing is avoided. In addition, the anchor point of the anchor chain is farther away from the unit, and the wind vane effect is more obvious.

[0018] 2. For the three-column floating foundation used in the double-impeller floating wind power system, the main column provides the entire floating foundation with buoyancy through the floating box and the reinforcing crossbeam. The first crossbeam and the second crossbeam establish a connection between the three columns. After the unit electrical energy is transmitted through the main column upper platform component area, it is transmitted to the slip ring through the extended column. The slip ring has a relative rotation electrical power transmission function, ensuring that the boost main cable transmitted from the rotating floating foundation is transmitted to the static outer turret. The slip ring electrical energy transmission is transmitted to the fixed dynamic submarine cable outlet through the slip ring boost main cable, thus forming an electrical energy transmission channel in a single-point mooring state. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view structural schematic diagram of the outer turret single-point mooring system of the double-impeller wind turbine of the embodiment of the present application.

[0020] Figure 2 is a front view structural schematic diagram of the outer turret single-point mooring system of the double-impeller wind turbine of the embodiment of the present application.

[0021] Figure 3 is a structural schematic diagram of the single-point mooring device in the embodiment of the present application.

[0022] Figure 4is a schematic diagram of the connection relationship among the main bearing, the turret support ring and the chain wheel in the embodiment of the present application.

[0023] Figure 5 is a schematic diagram of the arrangement of the outer extension column, the main column and the V-shaped support in the embodiment of the present application.

[0024] Figure 6 is a schematic diagram of the floating foundation and the internal cable thereof in the embodiment of the present application.

[0025] Legend: 1, first wind turbine; 11, support tower drum; 2, second wind turbine; 3, single point mooring device; 31, outer turret; 32, main bearing; 33, chain wheel; 34, anchor chain; 35, chain stopper; 4, main column; 41, lower float; 42, outer extension column; 43, mounting groove; 44, turret support ring; 45, cable outlet; 5, V-shaped support; 51, first column; 52, second column; 53, first cross beam; 54, second cross beam; 55, reinforcing cross beam; 6, seawater waterplane; 7, component group; 71, current transformer; 72, transformer; 73, ring network cabinet; 8, slip ring; 91, turbine cable; 92, step-up main cable; 93, slip ring main cable. DETAILED DESCRIPTION

[0026] The following will be described in detail in combination with the accompanying Figures 1-6 The present application will be further described in detail.

[0027] The terms "upper", "lower", "left", "right", "front", "back" and the like in the present application only represent relative positions in the drawings, are for the convenience of describing the present application, and do not represent absolute positions of the product, and should not be regarded as a limitation on the present application.

[0028] The embodiment of the present application discloses a double-impeller wind turbine outer turret type single point mooring system.

[0029] As shown in Figure 1 and Figure 2 , the double-impeller wind turbine outer turret type single point mooring system of the present embodiment comprises a floating foundation, a first wind turbine 1, a second wind turbine 2 and a single point mooring device 3. The floating foundation comprises 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 with the main column 4, the bottom of the main column 4 is provided with a lower float 41, and the first wind turbine 1 and the second wind turbine 2 are separately installed on the top of the V-shaped support 5.

[0030] As shown in Figure 3 and Figure 4As shown, the single-point mooring device 3 comprises an outer turret 31, a main bearing 32, an anchor chain disc 33 and an anchor chain 34. The outer extension column 42 is arranged on the upper end of the main column 4 and is arranged on the two sides of the main column 4 with the V-shaped support 5. The end of the outer extension column 42 away from the main column 4 has a mounting groove 43 with a downward slot, the outer turret 31 is arranged in the mounting groove 43, the main bearing 32 is arranged on the inner wall of the mounting groove 43 and the outer turret 31, the inner ring of the main bearing 32 is connected with the outer turret 31 and the outer ring is connected with the inner wall of the mounting groove 43, the anchor chain disc 33 is fixedly connected with the bottom of the outer turret 31, one end of the anchor chain 34 is connected with the anchor chain disc 33 and the other end is fixed with the seabed. The floating foundation rotates relative to the outer turret 31 through the outer extension column 42 and the outer ring of the main bearing 32.

[0031] In use, the floating foundation floats on the waterline 6 of the sea, the outer extension column 42 is above the sea, so that the outer turret 31 and the main bearing 32 are above the waterline 6 of the sea. The anchor chain 34 is pulled tight through the connection with the seabed, the lower floating box 41 at the bottom of the main column 4 provides the buoyancy of the foundation, the sinking force of the V-shaped support 5 on the other side of the main column 4 balances with the pulling force of the anchor chain 34 on this side of the outer extension column 42, the whole floating wind turbine generator is fixed through the anchor chain of the single-point mooring, and the foundation is ensured not to be deviated by the sea waves or the pushing force of the wind. Referring to Figure 2 , the arrow k in the figure represents the wind direction (positive wind direction), the mooring point is in front of the wind turbines of the first wind turbine generator 1 and the second wind turbine generator 2, and the wind blows to the two wind turbines, so that the blades of the wind turbines are subjected to the pushing force F 推 of the wind. The mooring point gives the floating foundation a pulling force F 拉 . Due to the change of the blade angle of the two wind turbines, the pushing force of the two wind turbines is different in size and direction, so that the floating foundation at the bottom of the two wind turbines rotates around the single-point mooring outer turret 31 as the rotation center. When the wind turbine of the first wind turbine generator 1 is subjected to a large force, it swings to the direction of the wind turbine of the second wind turbine generator 2, and when the wind turbine of the second wind turbine generator 2 is subjected to a large force, it swings to the wind turbine of the first wind turbine generator 1. After the rotation swing, the wind turbine of the first wind turbine generator 1 and the wind turbine of the second wind turbine generator 2 are adjusted to the appropriate positions, so that the sum of the forces of the two wind turbines is equal to the pushing force F 推 of the wind and is in the same straight line . At this time, the two wind turbines complete the yawing to the wind and will not swing left and right again, and the whole floating foundation stops rotating relative to the mooring point, so as to realize the free yawing to the wind of the two wind turbine generators. After the free yawing to the wind of the two wind turbines, the blades thereof will normally rotate to generate electricity.

[0032] Under the combined action of wind and wave, the whole floating foundation rotates around the outer turret 31 of the single point mooring device through the main column 4, the outer extension column 42 and the outer ring of the main bearing 32 to yaw against the wind, and the wind direction superimposes the wave to actively against the wind, so that the two wind turbines can freely against the wind, and the active yaw system of the wind turbine is cancelled to reduce the failure rate of the wind turbine. Meanwhile, the outer extension column 42 is used to make the outer turret 31 be independently prefabricated, so as to reduce the overall construction difficulty. Since the mooring point of the outer turret 31 is floating above the waterline and is not submerged in seawater, the machining of the large-size bearing and the difficulty of the main bearing sealing are avoided. In addition, the anchor point of the anchor chain is farther away from the unit (the anchor chain disc is lifted to the seawater surface 6 and separated from seawater), the wind vane effect is more obvious, the height of the mooring point and the seabed is increased, the catenary effect of the catenary mooring cable is more obvious, the mooring cable configuration is easier to arrange, and higher restoring force stiffness can be provided. If the single point mooring structure is arranged at the bottom of the main column 4, the rotating structure needs to be arranged in the floating body, and the space inside the floating body needs to be reserved and the structure needs to be strengthened, which not only increases the space of the floating body, but also increases the material consumption and the manufacturing process is more complex. In addition, since the mooring point is at the bottom of the floating body, the distance between the mooring point and the seabed is short, and the design configuration of the mooring cable is complex.

[0033] In the embodiment, the outer extension column 42 is a hollow structure, which is welded on the circumferential side wall 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 arranged on the outer wall surface near the end, and the groove opening of the mounting groove 43 is vertically downward. In order to facilitate the connection between the main bearing 32 and the outer extension column 42, the tower 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 with the tower support ring 44. The structure of the outer extension column 42 can be segmented and spliced, and can be spliced on site without the help of a dock, which greatly reduces the dependence on the dock.

[0034] In the embodiment, the anchor chain disc 33 is provided with a chain stopper 35 at the bottom, and the chain stopper 35 is used to fix the anchor chain 34. The anchor chain disc 33 is provided with an anchor chain puller (not shown in the figure) above the chain stopper 35, the anchor chain puller is connected with the anchor chain 34, and the anchor chain puller is used to tension the anchor chain 34 to prevent the anchor chain 34 from relaxing after a long time of operation.

[0035] In this embodiment, 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. A reinforcing cross beam 55 is connected between the first column 51 and the second column 52, the reinforcing cross beam 55 is at the bottom of the V-shaped support 5, the main column 4, the reinforcing cross beam 55, the first column 51 and the second column 52 are all hollow structures. The floating foundation mainly consists of a three-column floating foundation composed of the first column 51, the second column 52 and the main column 4, the lower floating box 41 and the reinforcing cross beam 55 are completely submerged in seawater, the lower ends of the first column 51, the second column 52 and the main column 4 are partially submerged in seawater, and the entire floating foundation mainly provides buoyancy through the lower floating box 41 and the hollow reinforcing cross beam 55. A first cross beam 53 is arranged between the first column 51 and the main column 4, and a second cross beam 54 is arranged between the second column 52 and the main column 4, the first cross beam 53 and the second cross beam 54 realize the connection between the V-shaped support 5 and the main column 4, and the first cross beam 53 and the second cross beam 54 are both hollow structures to reduce the overall weight of the foundation. The first cross beam 53 and the second cross beam 54 are located in the same horizontal plane and are arranged in a V shape in the horizontal plane, the reinforcing cross beam 55 is arranged horizontally, the first cross beam 53 and the second cross beam 54 are located above the seawater line 6, and the reinforcing cross beam 55 is located below the seawater line 6.

[0036] As shown in Figure 5 and Figure 6 In this embodiment, the main column 4 is provided with a component group 7 at the upper end, the component group 7 mainly includes a converter 71, a transformer 72 and a ring network cabinet 73. The unit cable 91 of the first wind turbine 1 passes through the first cross beam 53 and extends into the main column 4, and is sequentially connected to the converter 71, the transformer 72 and the ring network cabinet 73. The unit cable 91 of the second wind turbine 2 passes through the second cross beam 54 and extends into the main column 4, and is also sequentially connected to the converter 71, the transformer 72 and the ring network cabinet 73. The inside of the main column 4 is in communication with the inside of the outer extension column 42, the mounting groove 43 of the outer extension column is provided with a slip ring 8, the rotating outer ring of the slip ring 8 is fixedly connected with the inner wall of the mounting groove 43, and the fixed inner ring of the slip ring 8 is fixedly connected with the top of the outer rotating tower 31. Figure 3As shown, two unit cables 91 are connected to the component group 7 and then merged, and the voltage-boosting main cable 92 is led out from the ring net cabinet 73, penetrates into the outer extension column 42, and is connected to the rotating outer ring of the slip ring 8. The slip ring main 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, and the slip ring main cable 93 penetrates out of the cable outlet 45. When the floating foundation rotates, the voltage-boosting main cable 92 rotates with the rotating outer ring of the main column 4 and the slip ring 8, while the fixed inner ring of the slip ring 8 remains stationary with the outer rotating tower 31, so that the slip ring main cable 93 remains stationary. The conductive brush head inside the slip ring 8 realizes the conductive connection between the rotating voltage-boosting main cable 92 and the stationary slip ring main cable 93. The electric energy of the unit is transmitted to the cable outlet 45 through the slip ring 8, and thus the electric energy transmission in the single-point mooring state is formed.

[0037] As shown in Figure 1 and Figure 2 In the embodiment, in the front 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, and the first column 51 and the second column 52 form an acute angle β with the horizontal plane. In the side projection plane, the main column 4 is vertically arranged, the first column 51 and the second column 52 are inclined to the main column 4, and 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 the embodiment, the first wind turbine 1 is installed on the first column 51 through the support tower drum 11, and the first column 51 is collinear with the support tower drum 11. Similarly, the second wind turbine 2 is installed on the second column 52 through the support tower drum 11, and the second column 52 is collinear with the support tower drum 11. In the front 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, and the first column 51 and the second column 52 form an acute angle β with the horizontal plane, that is, the two support tower drums 11 are inclined outward, which can reduce the horizontal distance between the two unit tower drum bottom foundations. In the side projection plane, the main column 4 is vertically arranged, the first column 51 and the second column 52 are inclined to the main column 4, and 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, that is, the two support tower drums 11 are inclined forward, which increases the distance between the blade tip of the unit and the tower drum (the blade tip is closer to the tower drum when vertical), avoids the risk of collision (sweeping the tower) between the blade and the tower drum due to the deformation of the blade under load in the conventional vertical tower drum, and controls the gravity center to make the overall platform gravity center more stable. The values of β and α are 0-90°.

[0038] The implementation principle of the outer rotating tower type single-point mooring system of the double-impeller wind turbine in the embodiment is as follows:

[0039] In use, the floating foundation is located at sea level, and the whole floating foundation is fixed to the seabed by anchor chain 34. Among them, the lower floating box 41 and the reinforcing cross beam 55 are submerged in seawater (below the waterline 6), and the first cross beam 53 and the second cross beam 54 are located above the waterline 6. The first wind turbine 1 and the second wind turbine 2 are upwind units, and their windward surfaces are arranged to face the wind. When wind and waves act on the floating foundation, each wind turbine, the first vertical column 51, the second vertical column 52, and the main vertical column 4 rotate around the outer rotating tower 31 through 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 anchor chain of the single-point mooring fixes the entire floating wind power and ensures that the foundation does not deviate with the push of the sea waves or wind. The unit cables 91 of the two units come out of the first vertical column 51 and the second vertical column 52, pass through the first cross beam 53 and the second cross beam 54, enter the main vertical column 4, and are connected to the component group 7. After the booster main cable 92 is introduced, it enters the outer extension column 42 and is connected to the slip ring 8. The slip ring main cable 93 is introduced from the cable outlet 45 at the bottom of the anchor chain disc 33, and the rotating booster main cable 92 is electrically connected to the static slip ring main cable 93 through the slip ring 8. The power of the wind turbine is introduced from the cable outlet 45 of the floating foundation, forming power transmission in a single-point mooring state, and ensuring that the dynamic cable for power transmission at the unit end is sent out through the mooring point.

[0040] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made in accordance with the structure, shape, and principle of the present application should be covered within the protection scope of the present 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). An outer extension column (42) is provided on the side of the upper end of the main column (4) away from the V-shaped support (5). The outer extension column (42) is located away from the V-shaped support (5). The end of 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). 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. At the top of the first column (51), the second wind turbine (2) is installed at the top of the second column (52); 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; a component group (7) is provided inside the main column (4), and the unit cable (91) of the first wind turbine (1) passes through the first crossbeam (53) and extends into the main column (4). The second wind turbine (2) is connected to the component group (7) inside. 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 provided with a slip ring (8). The outer ring of the slip ring (8) is fixedly connected to the inner wall of the mounting groove (43). The inner 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.

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 as described in claim 1, 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).

5. The single-point mooring system for a dual-blade wind turbine external turret according to claim 1, 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.

6. The single-point mooring system for the external turret of a dual-blade wind turbine as described in claim 1, 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.

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