Floating type wind power single-point mooring system of double-impeller unit

Abstract

The invention relates to the field of wind power generation, in particular to a double-impeller-unit floating type wind power single-point mooring system which comprises a floating type foundation, a first wind turbine unit, a second wind turbine unit and a single-point mooring device, the floating type foundation comprises a main stand column and a V-shaped support connected with the main stand column, and the first wind turbine unit and the second wind turbine unit are separately installed at the top of the V-shaped support; the mooring device comprises an inner rotating tower, a main bearing, an anchor chain disc and an anchor chain, a mounting groove is formed in the bottom of the lower floating box, the inner rotating tower is arranged in the mounting groove, the anchor chain disc is fixedly connected with the bottom of the inner rotating tower, one end of the anchor chain is connected with the anchor chain disc, and the other end of the anchor chain is fixed to a seabed. An inner ring of the main bearing is connected with the inner turret, an outer ring of the main bearing is connected with the turret supporting ring, and the floating foundation rotates relative to the inner turret through the turret supporting ring and the outer ring of the main bearing. The floating type foundation can rotate around the mooring point, it is guaranteed that the wind turbine generator can face wind freely, a generator yaw system is omitted, and the fault rate of the generator is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of offshore wind power generation, in particular to a single-point mooring system for a double-impeller unit floating wind power generation. BACKGROUND

[0002] Currently, the sea area for wind power development is gradually moving towards the deep sea, 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 commercial operation, which specifically includes breakthroughs in three major technologies: wind turbine units, floating foundations, and mooring systems.

[0003] Currently, there are two types of super-large deep-sea floating units with a capacity of 25 MW or more. One is a conventional single unit, which means one unit is equipped with one floating foundation. For a single-unit floating unit, the wind turbine yaw system, as a servo system of the wind turbine unit, adjusts the orientation of the impeller to keep the wind turbine facing the wind direction at all times to capture the maximum wind energy. The yaw drive is basically arranged on the top of the tower to drive the unit to rotate around the tower.

[0004] The other type is to split the power of a single unit into two units, using two units to share one floating foundation. For this structure, the two units cannot be equipped with corresponding yaw systems on the top of the unit tower to achieve wind alignment, otherwise the two wind turbine structures will interfere with each other, and the overall yaw alignment of the floating foundation needs to be considered. Currently, there is no related product or solution for the single-point mooring system structure of the floating wind power. SUMMARY

[0005] To solve the problem of yaw alignment of the double-impeller unit on the floating foundation, the present application provides a single-point mooring system for a double-impeller unit floating wind power generation.

[0006] The single-point mooring system for a double-impeller unit floating wind power generation provided by the present application adopts the following technical solution: A single-point mooring system for a double-impeller unit floating wind power generation, comprising a floating foundation, a first wind turbine unit, a second wind turbine unit, 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 to the main column. The first wind turbine unit and the second wind turbine unit are installed separately 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 inner turret, a main bearing, an anchor chain disc, and an anchor chain. The bottom of the lower floating box has a mounting groove. The inner turret is arranged in the mounting groove. The anchor chain disc is fixedly connected to the bottom of the inner 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 wall of the mounting groove is provided with a turret support ring. The inner ring of the main bearing is connected to the inner turret, and the outer ring is connected to the turret support ring. The floating foundation rotates relative to the inner turret through the turret support ring and the outer ring of the main bearing.

[0007] By adopting the technical scheme, the main column of the floating foundation is arranged as a single-point mooring point, the inner turret, the inner ring of the main bearing and the anchor chain disc form a fixed end, and the outer ring of the main bearing, the turret support ring and the main column form a rotating part, so that the floating foundation, the first wind turbine and the second wind turbine can relatively rotate around the main column, the anchor chain of the mooring point is fixed on the main column, the whole floating foundation relatively rotates around the single point under the combined action of wind and wave, free wind alignment is realized, and the wind turbines can be aligned with the wind direction at any time, so that the whole yaw system and related control of the wind turbines can be cancelled, the failure rate of the wind turbines is reduced, and the reliability of the product is greatly improved.

[0008] Preferably, an annular gap facilitating rotation is arranged between the outer side of the anchor chain disc and the inner side of the turret support ring, and a sealing structure is arranged in the annular gap.

[0009] By adopting the technical scheme, the annular gap ensures that the deformation of the anchor chain disc and the turret support ring does not collide, reduces the friction therebetween, and improves the stability of the rotation of the floating foundation.

[0010] Preferably, the sealing structure comprises a sealing oil column.

[0011] By adopting the technical scheme, the sealing oil column separates the seawater and the main bearing, the sealing oil column is blocked by the seawater pressure, the sealing reliability is high, and no corrosion and aging problems caused by other sealing elements occur.

[0012] Preferably, a chain stopper for fixing the anchor chain is arranged at the bottom of the anchor chain disc, an anchor chain puller is arranged above the chain stopper, and the anchor chain puller is connected with the anchor chain and used for tensioning the anchor chain.

[0013] By adopting the technical scheme, the anchor chain puller can tension the anchor chain, preventing the anchor chain from relaxing after a long time of operation.

[0014] Preferably, the main column is hollow to form an inner cavity, the inner cavity is communicated with the mounting groove, a component group is arranged at the upper end of the inner cavity, a slip ring is arranged between the lower end of the inner cavity and the mounting groove, the fixed inner ring of the slip ring is fixedly connected with the top of the inner turret, the rotating outer ring of the slip ring is fixedly connected with the side wall of the inner cavity, the unit cables of the first wind turbine and the second wind turbine are connected to the component group after penetrating into the inner cavity, the component group is connected with a booster main cable, the end of the booster main cable away from the component group is connected to the slip ring, the slip ring is connected with a slip ring main cable, and the bottom of the lower floating box is provided with a cable outlet for the slip ring main cable.

[0015] By adopting the technical scheme, when the floating foundation rotates, the booster main cable rotates with the rotating outer ring of the main column and the slip ring, the fixed inner ring of the slip ring remains stationary with the inner rotating tower, the slip ring main cable remains stationary, the conductive brush head inside the slip ring realizes the conductive connection between the rotating booster main cable and the stationary slip ring main cable, and the electric energy of the unit is transmitted to the cable outlet through the slip ring, so that the dynamic cable for power transmission of the unit is externally transmitted through the mooring point.

[0016] Preferably, the V-shaped support includes 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 at the top of the first column, the second wind turbine is installed at the top of the second column, a first cross beam is arranged between the first column and the main column, a second cross beam is arranged between the second column and the main column, and the unit cable of the first wind turbine passes through the first cross beam and is connected to the inner cavity of the main column, and the unit cable of the second wind turbine passes through the second cross beam and is connected to the inner cavity of the main column.

[0017] By adopting the technical scheme, the unit cable of the wind turbine is introduced into the main column through the first and second cross beams, and then externally transmitted through the single-point mooring device.

[0018] Preferably, a reinforcing cross beam is connected between the first column and the second column, and the first cross beam, the second cross beam, the reinforcing cross beam, the first column and the second column are all hollow structures. 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 below the first cross beam and the second cross beam.

[0019] By adopting the technical scheme, the hollow reinforcing cross beam provides buoyancy support for the floating foundation, and the hollow first column and second column reduce weight and provide certain buoyancy.

[0020] In summary, the present application has at least one of the following beneficial technical effects: 1. The main column of the floating foundation is arranged as a single-point mooring point, so that the floating foundation, the first wind turbine and the second wind turbine can rotate relative to the main column, and the single-point mooring mechanical system is composed of the inner rotating tower, the main bearing, the rotating tower support ring and the anchor chain disc. The inner rotating tower, the inner ring of the main bearing and the anchor chain disc form a fixed end, and the outer ring of the main bearing and the rotating tower support ring form a rotating part. The mooring point anchor chain is fixed to a single column, so that the entire floating foundation rotates relative to a point under the combined action of wind and waves, and realizes free wind alignment. In this way, the entire unit yawing system and related control can be cancelled, and the reliability of the product is greatly improved.

[0021] 2. For the three-column floating foundation of the double-impeller floating wind power system, the entire floating foundation buoyancy is provided by the main column lower floating box and the cross column, the connection among the three columns is established by the inclined cross beam, the unit device area of the main column upper platform is connected through the floating column and the cross column, and the power transmission is transmitted to the main column lower slip ring, the slip ring has the relative rotation power transmission function, the rotating floating foundation transmission booster main cable is transmitted to the inner rotating tower in the static state, the slip ring power transmission is transmitted to the fixed dynamic submarine cable outlet through the slip ring booster main cable, and thus the power transmission channel in the single-point mooring state is formed.

[0022] 3. A circumferential gap is arranged between the anchor chain disc and the tower support ring, the circumferential gap is filled with a certain height of sealing oil column, so that the seawater and the main bearing are isolated, the circumferential gap does not collide in the case of meeting the deformation of the anchor chain disc and the tower support ring structure, and sufficient pressure balance seawater pressure is provided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the single-point mooring system of the double-impeller unit floating wind power of the embodiment of the present application.

[0024] Figure 2 It is a structural schematic diagram of the floating foundation in the embodiment of the present application.

[0025] Figure 3 It is a structural schematic diagram of the main column, the first cross beam and the second cross beam connection part in the embodiment of the present application.

[0026] Figure 4 It is an internal structural schematic diagram of the main column in the embodiment of the present application.

[0027] Figure 5 It is a structural schematic diagram of the single-point mooring device in the embodiment of the present application.

[0028] Figure 6 It is Figure 5 The enlarged view of A in FIG. 6.

[0029] Figure 7 It is a structural schematic diagram of the slip ring in the embodiment of the present application.

[0030] Explanation of reference signs: 1, first wind turbine; 2, second wind turbine; 3, single point mooring device; 31, inner rotating tower; 32, main bearing; 33, anchor chain disc; 34, anchor chain; 35, chain stopper; 36, anchor chain puller; 4, main column; 401, inner cavity; 41, lower floating box; 42, mounting groove; 43, rotating tower support ring; 44, cable outlet; 5, V-shaped support; 51, first column; 52, second column; 53, first cross beam; 54, second cross beam; 55, reinforcing cross beam; 61, annular gap; 62, sealed oil column; 7, component group; 71, current transformer; 72, transformer; 73, ring network cabinet; 8, slip ring; 81, fixed inner ring; 82, rotating outer ring; 83, conductive brush head; 91, unit cable; 92, booster main cable; 93, slip ring main cable; 10, seawater waterline surface. DETAILED DESCRIPTION

[0031] The following will be described in detail below with reference to the accompanying drawings. Figures 1-7 The application is further described in detail.

[0032] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like represent only the relative positions in the drawings and are used for the convenience of describing the present application, and do not represent the absolute positions of the products and should not be construed as limiting the present application.

[0033] The embodiment of the present application discloses a floating type wind power single point mooring system of double impeller unit.

[0034] As shown in Figure 1 and Figure 2 , the floating type wind power single point mooring system of double impeller unit of the 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, and the bottom of the main column 4 is provided with a lower floating box 41. The first wind turbine 1 and the second wind turbine 2 are separately installed on the top of the V-shaped support 5.

[0035] As shown in Figure 5 and Figure 6 , the single point mooring device 3 comprises an inner rotating tower 31, a main bearing 32, an anchor chain disc 33 and an anchor chain 34, the bottom of the lower floating box 41 is provided with a mounting groove 42, the inner wall of the mounting groove 42 is provided with a rotating tower support ring 43, the inner rotating tower 31 is arranged in the mounting groove 42, the main bearing 32 is arranged between the inner rotating tower 31 and the rotating tower support ring 43, the inner ring of the main bearing 32 is connected with the inner rotating tower 31, the outer ring of the main bearing 32 is connected with the rotating tower support ring 43, the anchor chain disc 33 is fixedly connected with the bottom of the inner rotating tower 31, the upper end of the anchor chain 34 is connected with the anchor chain disc 33, and the lower end is fixed with the seabed. The floating foundation rotates relative to the inner rotating tower 31 through the rotating tower support ring 43 and the outer ring of the main bearing 32.

[0036] By the above-mentioned single-point mooring system, firstly, two wind turbine units are installed on a floating foundation, which can effectively avoid the bottleneck of mechanical manufacturing and processing capacity, the bottleneck of experimental test equipment capacity, and the bottleneck of hoisting and transportation equipment capacity caused by the development of super-power units, can be directly used with existing mature products, and can greatly reduce the supply chain manufacturing cost, and better realize the commercial operation of the floating unit with high cost performance. Secondly, the single-point mooring mainly fixes the mooring point anchor chain to a single column, so that the entire floating foundation rotates relatively around the point under the combined action of wind and wave, and realizes free wind alignment. In this way, the entire unit yawing system and related control can be cancelled, and the reliability of the product can be greatly improved. The single-point mooring realizes wind alignment by using the combined action of wind and wave, so the farther the mooring point is from the center of gravity of the floating foundation, the higher the wind alignment efficiency. Therefore, in the floating foundation, the main column 4 is used as the single-point mooring point, so that the floating foundation, the first wind turbine unit 1 and the second wind turbine unit 2 can rotate relatively around the main column 4. The inner rotating tower 31, the inner ring of the main bearing 32 and the anchor chain disc 33 form a single-point mooring mechanical system. The inner rotating tower 31, the inner ring of the main bearing 32 and the anchor chain disc 33 form a fixed end that remains stationary. The outer ring of the main bearing 32 and the rotating tower support ring 43 form a rotating part that rotates around the inner rotating tower 31. The rotating tower support ring 43 is fixed to the lower floating box 41 by welding. The load generated by the movement of the entire floating foundation is finally transmitted to the main bearing 32 through the rotating tower support ring 43, so that the overall load of the floating body is finally transmitted to the anchor chain 34 on the anchor chain disc 33 and to the seabed. The key of the single-point mooring structure lies in that only one set of main bearing 32 is used to realize the rotation of the entire floating foundation.

[0037] In the embodiment, since the installation groove 42 of the lower floating box 41 is downward, after the installation of the inner rotating tower 31 and the anchor chain disc 33, the groove is basically closed by the rotating tower support ring 43 and the anchor chain disc 33. However, since the inner and outer rings of the main bearing 32 need to have a rotating space, an annular gap 61 for rotation is arranged on the outside of the anchor chain disc 33 and the inside of the rotating tower support ring 43. When the rotating tower support ring 43 and the outer ring of the main bearing 32 rotate, the inner edge of the rotating tower support ring 43 will not contact and rub the outer edge of the anchor chain disc 33. In order to ensure sealing, a sealing organization is arranged in the annular gap 61. Preferably, the sealing organization is a sealing oil column 62. The annular gap is filled with a sealing oil column with a certain height, so that the seawater and the main bearing 32 are isolated. The width of the annular gap 61 should be as small as possible under the premise that the anchor chain disc 33 and the structure of the rotating tower support ring 43 do not collide due to deformation, so as to provide sufficient pressure balance for seawater pressure.

[0038] In the embodiment, the anchor chain stopper 35 is installed at the bottom of the anchor chain disc 33. The anchor chain stopper 35 is used to fix the anchor chain 34. The anchor chain disc 33 is provided with an anchor chain puller 36 above the anchor chain stopper 35. The anchor chain puller 36 is connected with the anchor chain 34. The anchor chain puller 36 is used to tension the anchor chain 34, so as to prevent the anchor chain 34 from relaxing after a long period of operation.

[0039] In the embodiment, the V-shaped support 5 comprises 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, and the reinforcing cross beam 55, the first column 51 and the second column 52 are all hollow structures. The floating foundation mainly comprises a three-column floating foundation formed by the first column 51, the second column 52 and the main column 4, and the lower floating box 41 and the reinforcing cross beam 55 are submerged in seawater, and the entire floating foundation buoyancy is provided by the lower floating box 41 and the reinforcing cross beam 55.

[0040] The main column 4 is hollow to form an inner cavity 401, 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, and the first cross beam 53 and the second cross beam 54 are both hollow structures. The unit cable 91 of the first wind turbine 1 passes through the first cross beam 53 and is connected to the inner cavity 401 of the main column 4, and the unit cable 91 of the second wind turbine 2 passes through the second cross beam 54 and is connected to the inner cavity 401 of the main column 4. 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, and the first cross beam 53 and the second cross beam 54 are located above the seawater line 10.

[0041] As shown in Figure 3 and Figure 4 In the embodiment, the inner cavity 401 of the main column 4 is in communication with the installation groove 42, the upper end of the inner cavity 401 is provided with a component group 7, and the component group 7 mainly comprises a converter 71, a transformer 72 and a ring network cabinet 73. A slip ring 8 is arranged between the lower end of the inner cavity 401 and the installation groove 42, the fixed inner ring 81 of the slip ring 8 is fixedly connected to the top of the inner tower 31, the rotating outer ring 82 of the slip ring 8 is fixedly connected to the side wall of the inner cavity 401, and the unit cable 91 of the first wind turbine 1 and the second wind turbine 2 enters the inner cavity 401 of the main column 4 through the first cross beam 53 and the second cross beam 54 respectively, and is sequentially connected to the converter 71, the transformer 72 and the ring network cabinet 73. The booster main cable 92 is formed from the ring network cabinet 73, the booster main cable 92 is connected to the rotating outer ring 82 of the slip ring 8 along the side wall of the inner cavity 401 of the main column 4, the slip ring main cable 93 is formed from the fixed inner ring 81 of the slip ring 8, and the slip ring main cable 93 passes out of the cable outlet 44 at the bottom of the lower floating box 41. Figure 7As shown, when the floating foundation rotates, the booster main cable 92 rotates with the rotating outer ring 82 of the main column 4 and the slip ring, while the fixed inner ring 81 of the slip ring 8 remains stationary with the inner rotating tower 31, so that the slip ring main cable 93 remains stationary, and the conductive brush head 83 inside the slip ring realizes the conductive connection between the rotating booster main cable 92 and the stationary slip ring main cable 93, and the power of the unit is transmitted through the slip ring to the cable outlet 44, thus forming the power transmission in the single-point mooring state.

[0042] The implementation principle of the double-impeller unit floating wind power single-point mooring system of the embodiment is as follows: The floating foundation is located on the sea level and is fixed to the seabed as a whole through the anchor chain 34. Among them, the lower floating box 41 and the reinforced cross beam 55 are submerged in seawater (below the sea waterline 10), and the first cross beam 53 and the second cross beam 54 are located above the sea waterline 10. The first wind power unit 1 and the second wind power unit 2 are upwind units, and their windward surfaces are arranged to face the wind. When the wind and waves act on the floating foundation, each wind power unit, the first column 51, the second column 52, and the main column 4 rotate around the inner rotating tower 31 through the main bearing 32 to realize the free wind-ward of the first wind power unit 1 and the second wind power unit 2, and through the single-point mooring mooring chain, the entire floating wind power is fixed to ensure that the foundation does not deviate with the sea waves or the driving of the wind force; the unit cable 91 of the two units comes out of the first column 51 and the second column 52, passes through the first cross beam 53 and the second cross beam 54 into the main column 4, is connected to the component group 7, and then the booster main cable 92 is led out. The booster main cable 92 is connected to the rotating outer ring 82, and the slip ring main cable 93 is led out from the fixed inner ring 81, and finally led out from the cable outlet 44, and the conductive connection between the rotating booster main cable 92 and the stationary slip ring main cable 93 is realized through the slip ring 8. The power of the wind power unit is led out from the cable outlet 44 of the floating foundation, forming the power transmission in the single-point mooring state, and ensuring that the dynamic cable for power transmission at the unit end is externally sent through the mooring point.

[0043] 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 on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A floating wind power single point mooring system for a double-impeller machine unit, characterized in that: The application relates to a floating foundation, a first wind turbine (1), a second wind turbine (2) and a single-point mooring device (3), wherein the floating foundation comprises a main column (4) and a V-shaped support (5) arranged on one side of the main column (4), the V-shaped support (5) is connected with the main column (4), the first wind turbine (1) and the second wind turbine (2) are separately arranged on the top of the V-shaped support (5), the bottom of the main column (4) is provided with a lower floating box (41), the single-point mooring device (3) comprises an inner rotating tower (31), a main bearing (32), an anchor chain disc (33) and an anchor chain (34), the lower floating box (41) is provided with an installation groove (42) at the bottom, the inner rotating tower (31) is arranged in the installation groove (42), the anchor chain disc (33) is fixedly connected with the bottom of the inner rotating tower (31), one end of the anchor chain (34) is connected with the anchor chain disc (33), and the other end is fixed with a seabed, the inner wall of the installation groove (42) is provided with a rotating tower supporting ring (43), the inner ring of the main bearing (32) is connected with the inner rotating tower (31), and the outer ring is connected with the rotating tower supporting ring (43), and the floating foundation rotates relative to the inner rotating tower (31) through the rotating tower supporting ring (43) and the outer ring of the main bearing (32).

2. The twin-impeller set floating wind power single point mooring system according to claim 1, characterized in that: An annular gap (61) for facilitating rotation is arranged between the outer side of the anchor chain disc (33) and the inner side of the rotating tower supporting ring (43), and a sealing organization is arranged in the annular gap (61).

3. The twin-impeller set floating wind power single point mooring system according to claim 2, characterized in that: The sealing organization comprises a sealing oil column (62).

4. The twin-impeller set floating wind power single point mooring system according to any one of claims 1 to 3, characterized in that: The anchor chain disc (33) is provided with a chain stopper (35) for fixing the anchor chain (34) at the bottom, the anchor chain disc (33) is provided with an anchor chain puller (36) above the chain stopper (35), the anchor chain puller (36) is connected with the anchor chain (34) and used for tensioning the anchor chain (34).

5. The twin-impeller set floating wind power single point mooring system according to any one of claims 1 to 3, characterized in that: The main column (4) is hollow to form an inner cavity (401), the inner cavity (401) is communicated with the installation groove (42), the upper end of the inner cavity (401) is provided with a component group (7), a slip ring (8) is arranged between the lower end of the inner cavity (401) and the installation groove (42), the fixed inner ring (81) of the slip ring (8) is fixedly connected with the top of the inner rotating tower (31), the rotating outer ring (82) of the slip ring (8) is fixedly connected with the side wall of the inner cavity (401), the unit cable (91) of the first wind turbine (1) and the second wind turbine (2) is connected with the component group (7) after penetrating into the inner cavity (401), the component group (7) is connected with a booster main cable (92), one end of the booster main cable (92) away from the component group (7) is connected with the slip ring (8), the slip ring (8) is connected with a slip ring main cable (93), and the bottom of the lower floating box (41) is provided with a cable outlet (44) for the slip ring main cable (93).

6. The twin-impeller set floating wind power single point mooring system according to claim 5, characterized in that: The V-shaped support (5) comprises 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), the second wind turbine (2) is installed on the top of the second column (52), a first cross beam (53) is arranged between the first column (51) and the main column (4), a second cross beam (54) is arranged between the second column (52) and the main column (4), the unit cable (91) of the first wind turbine (1) passes through the first cross beam (53) and is connected to the inner cavity (401) of the main column (4), and the unit cable (91) of the second wind turbine (2) passes through the second cross beam (54) and is connected to the inner cavity (401) of the main column (4).

7. The twin-impeller set floating wind power single point mooring system according to claim 6, characterized in that: The first column (51) and the second column (52) are connected with a reinforcing cross beam (55), the first cross beam (53), the second cross beam (54), the reinforcing cross beam (55), the first column (51) and the second column (52) are all hollow structures.

8. The twin-impeller set floating wind power single point mooring system according to claim 7, characterized in that: 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, and the reinforcing cross beam (55) is horizontally arranged and located below the first cross beam (53) and the second cross beam (54).

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