Truss type offshore floating wind power foundation platform

Abstract

The invention relates to the technical field of offshore wind power, in particular to a truss type offshore floating type wind power foundation platform which comprises a bottom frame, a wind turbine generator set, a floating type foundation and a three-dimensional truss structure, the three-dimensional truss structure comprises a truss body, floating boxes, a bottom box, a mooring turret and a mooring system, the floating boxes are fixed to two vertex angles of the bottom frame, and the bottom box is fixed to the bottom box. The mooring turret is fixedly connected to the other vertex angle, the bottom box is fixedly connected with the three vertex angles of the bottom frame, and the truss body is fixedly installed on the upper surface of the buoyancy tank. Large heave damping is formed through the floating type foundation and disturbance of surrounding seawater, fluctuation and swaying of the floating type foundation under the influence of environmental loads are restrained, a mooring system is arranged to passively and coaxially rotate around a mooring single point under the action of wind power, wind wheels of draught fans are kept to face the wind all the time, and by independently adjusting the output power of the two draught fans and the resistance of the wind wheels, the wind power generation efficiency is improved. The passive yaw function is actively intervened, and the maximum power generation efficiency is obtained through the maximum wind sweeping area.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to a truss-type offshore floating wind power foundation platform. Background Art

[0002] An offshore floating wind power foundation is an offshore floating structure used to carry wind turbines and supporting electromechanical equipment in deep-sea wind power development activities. Its main structural components include a buoy and a tower. It maintains a safe and stable floating state under conditions such as wind turbine loads and environmental loads, and achieves surface positioning by laying multiple mooring cables anchored to the seabed.

[0003] At present, the Chinese invention patent application with the publication date of February 9, 2024 and the publication number of CN117536792A proposes an offshore floating wind turbine foundation and an offshore wind turbine generator, including a wind turbine set, a support structure and a floating platform, the support structure includes a main support rod arranged upright and at least two auxiliary support rods arranged obliquely, the tops of the main support rod and all the auxiliary support rods are gathered to form an installation platform, and the wind turbine set is connected to the installation platform; the floating platform includes at least three floating devices, and the floating devices are connected to the bottom of the support structure one by one. The present invention supports the wind turbine set by setting a support structure, replacing the traditional tower structure with a larger diameter. The support structure has high rigidity, strong anti-deformation ability, small top acceleration, and the inertia force of the structure is significantly reduced; and the weight of the upper structure is significantly reduced, then the buoyancy required to be provided by the float is reduced, and the weight of the floating platform supported by the lower part is also reduced, further reducing the construction cost of the structure.

[0004] However, this technical solution still has the following shortcomings in practical application: 1. In the process of wind power generation, the above technical solution does not change obviously when tilted by environmental loads and wind turbine loads, and the restoring arm basically does not change with the draft, so that the restoring torque is small, resulting in a slow speed for the offshore floating foundation to return to a stable floating state, and a large rise and fall amplitude and shaking tilt angle of the column, which is not conducive to the power generation efficiency and safe operation of the wind turbine.

[0005] 2. When the real-time wind direction at sea changes, the wind turbine generator set can only rely on the slewing bearing and yaw system at the top of the tower to actively adjust the direction of the unit in real time. It cannot realize the passive yaw function of active intervention to maintain the front facing the wind with the maximum wind sweeping area, thereby reducing the power generation efficiency. Summary of the invention

[0006] In order to improve the problem that, during the process of wind power generation, the buoyancy change is not obvious when tilted by environmental loads and wind turbine loads, resulting in a slow recovery speed of the offshore floating foundation to a stable floating state, affecting the power generation efficiency and safe operation of the wind turbine, and at the same time solve the problem that the wind turbine motor group cannot realize the passive yaw function of active intervention, maintains the front to the wind with the maximum swept area, and reduces the power generation efficiency, the present invention provides a truss type offshore floating wind power foundation platform.

[0007] The present invention provides a truss-type offshore floating wind power foundation platform, which comprises a base frame, a wind turbine set, a floating foundation and a three-dimensional truss structure. The three-dimensional truss structure comprises a truss body, a pontoon, a bottom box, a mooring turret and a mooring system. The base frame is arranged in an equilateral triangle, the pontoon is fixedly connected to the upper surface of two of the top angles of the base frame, and the pontoon is arranged at an angle of 45°, the mooring turret is fixedly connected to the upper surface of the other top angle, the bottom box is fixedly connected to the three top angles of the base frame, the truss body is fixedly installed on the upper surface of the pontoon, and the truss body is arranged at 45°.

[0008] The mooring system is used for positioning the truss-type offshore floating wind power foundation platform on the sea surface, the wind turbine is used for wind power generation, and the floating foundation is used to reduce the heave amplitude and the shaking tilt angle of the truss-type offshore floating wind power foundation platform.

[0009] The above technical solutions in the embodiments of the present application have at least the following technical effects: 1. In the present invention, the bottom part of the pontoon is set to be disc-shaped, and the diameter edge obviously exceeds the pontoon. The discs are connected by flat box beams, so that the entire bottom box disturbs the surrounding seawater to form a large heave damping when the floating foundation moves with the waves, thereby suppressing the ups and downs and swaying of the floating foundation under the influence of environmental loads. By setting a mooring system, the floating wind power foundation platform is passively coaxially rotated around the mooring single point under the action of wind force, so as to keep the wind turbine rotor always facing the wind, realize the complete passive yaw function of the wind turbine set, and indirectly realize the precise adjustment of the direction of the wind rotor of the fixed installation unit, thereby eliminating the yaw transmission components such as the large-diameter rotating gear ring, yaw motor, gear box, etc. that are indispensable for traditional wind turbines, reducing potential failure points while realizing the optimization of system reliability and maintainability.

[0010] 2. By setting two main ducts to be tilted outward, a larger distance is formed at the top to facilitate the installation of two large wind turbines. At the same time, when the difference between wind force and wave direction is large, the output power and wind rotor resistance of the two wind turbines are adjusted separately to form a deflection torque, realize the passive yaw function of active intervention, and obtain the highest power generation efficiency with the maximum wind sweeping area. By setting the upper diagonal brace, the lower cross brace and the truss body at 45°, the position of the pontoon waterline changes with the draft of the floating foundation, which increases the restoring moment of the floating foundation, thereby accelerating the speed of the floating foundation to restore a stable floating state, and at the same time making the column heave amplitude and shaking tilt angle smaller, ensuring the power generation efficiency and safe operation of the wind turbine. In addition, by setting the upper diagonal brace and the lower cross brace to be flat pipes, the floating wind power foundation platform can achieve a small windward area while maintaining the same cross-sectional strength.

[0011] 3. By using two smaller wind turbines to form a high-power floating wind power system, the center of gravity elevation of the unit is reduced from nearly 200 meters to about 140 meters, and the diameter of the wind rotor is reduced from nearly 300 meters to about 200 meters. While the wind turbine load is reduced, it is dispersed on both sides of the floating foundation, which is beneficial to the lightweight and miniaturization of the floating foundation and saves production costs.

[0012] In some embodiments, the floating foundation includes a lower cross brace and an upper diagonal brace, the lower cross brace includes a first cross brace, a second cross brace and a third cross brace, the first cross brace and the second cross brace are fixedly connected between the mooring turret and the pontoon, the third cross brace is fixedly connected between the pontoons, the first cross brace, the second cross brace and the third cross brace are connected in an equilateral triangle, and the connected equilateral triangle is located directly above the base frame, and the upper diagonal brace is located above the lower cross brace.

[0013] In some embodiments, the upper diagonal brace includes a first diagonal brace, a second diagonal brace, a third diagonal brace and a fourth diagonal brace, the first diagonal brace and the second diagonal brace are fixedly connected between the truss body and the mooring turret, and one end of the first diagonal brace and the second diagonal brace are located at the top end of the truss body, the third diagonal brace and the fourth diagonal brace are fixedly connected between the truss body and the pontoon, and the third diagonal brace and the fourth diagonal brace are staggered.

[0014] In some embodiments, a fixing assembly is also provided between the truss body and the upper diagonal brace, and the fixing assembly includes a first fixing rod, a second fixing rod, a third fixing rod and a fourth fixing rod, the first fixing rod is fixedly installed between the truss body and the first diagonal brace, the second fixing rod is fixedly installed between the truss body and the second diagonal brace, the third fixing rod is fixedly installed between the bottom end of the truss body and the bottom end of the first diagonal brace, and the fourth fixing rod is fixedly installed between the bottom end of the truss body and the bottom end of the second diagonal brace.

[0015] In some embodiments, a main duct is fixedly connected to the top of the truss body, the main duct is tilted outward, and the wind turbine is fixedly installed inside the main duct.

[0016] In some embodiments, the mooring system includes a mooring rope, a mooring point and a mooring anchor point. The mooring point is rotatably mounted on a bottom box located at the bottom of a mooring turret, and the mooring point is located at the bottom end of the bottom box. The mooring rope is fixedly connected to the mooring point, and the mooring anchor point is fixedly connected to one end of the mooring rope away from the mooring point.

[0017] In some embodiments, a support rod is further provided between the buoyancy box and the mooring turret, one end of the support rod is fixedly connected to a position of the buoyancy box near the bottom, and the other end of the support rod is fixedly connected to a position of the mooring turret near the top.

[0018] In some embodiments, the upper diagonal brace and the lower horizontal brace are both flat pipes with an elliptical cross-section that is pointed at both ends. The bottom portion of the pontoon is disc-shaped, and the edge of the diameter significantly exceeds the pontoon. The interior of the pontoon is configured to be hollow, and ballast water or fixed ballast is placed inside the pontoon. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a truss-type offshore floating wind power foundation platform according to an embodiment of the present application; Figure 2 A schematic diagram of a three-dimensional truss structure of a truss-type offshore floating wind power foundation platform according to an embodiment of the application; Figure 3 This is a schematic diagram of the overall structure of a truss-type offshore floating wind power foundation platform from another perspective according to an embodiment of the present application; Figure 4 for Figure 3 Enlarged view of part A in the middle; Figure 5 A schematic diagram of a passive yaw mechanism of active intervention of a truss-type offshore floating wind power foundation platform according to an embodiment of the application; Figure 6 A schematic diagram of passive yaw of a truss-type offshore floating wind power foundation platform according to an embodiment of the application; Figure 7 A schematic diagram of the restoring moment of a truss-type offshore floating wind power foundation platform according to an embodiment of the application.

[0020] Among them, the reference numerals in the figure are: 1. Base frame; 2. Wind turbine; 3. Floating foundation; 31. Lower cross brace; 311. First cross brace; 312. Second cross brace; 313. Third cross brace; 32. Upper diagonal brace; 321. First diagonal brace; 322. Second diagonal brace; 323. Third diagonal brace; 324. Fourth diagonal brace; 4. Three-dimensional truss structure; 41. Truss body; 42. Floating tank; 43. Bottom tank; 44. Mooring turret; 45. Mooring system; 451. Mooring rope; 452. Mooring single point; 453. Mooring anchor point; 5. Fixing assembly; 51. First fixing rod; 52. Second fixing rod; 53. Third fixing rod; 54. Fourth fixing rod; 6. Main pipe; 7. Support rod. DETAILED DESCRIPTION

[0021] In order to reduce the rise and fall amplitude and the shaking and tilting angle of the column and realize the passive yaw function of active intervention, the embodiment of the present application provides the following solution.

[0022] Please also read Figures 1 to 7 The embodiment of the present application provides a truss-type offshore floating wind power foundation platform, a truss-type offshore floating wind power foundation platform includes a base frame 1, a wind turbine 2, a floating foundation 3 and a three-dimensional truss structure 4, the three-dimensional truss structure 4 includes a truss body 41, a pontoon 42, a bottom box 43, a mooring turret 44 and a mooring system 45, the base frame 1 is arranged in an equilateral triangle, the pontoon 42 is fixedly connected to the upper surface of two of the top angles of the base frame 1, and the pontoon 42 is inclined at 45°, the mooring turret 44 is fixedly connected to the upper surface of another top angle, the bottom box 43 is fixedly connected to the three top angles of the base frame 1, the truss body 41 is fixedly installed on the upper surface of the pontoon 42, and the truss body 41 is arranged at 45°, the mooring system 45 is used to position the truss-type offshore floating wind power foundation platform on the sea surface, the wind turbine 2 is used for wind power generation, and the floating foundation 3 is used to reduce the heave amplitude and shaking tilt angle of the truss-type offshore floating wind power foundation platform; Reference Figure 1 and Figure 2The floating foundation 3 includes a lower cross brace 31 and an upper diagonal brace 32. The lower cross brace 31 includes a first cross brace 311, a second cross brace 312 and a third cross brace 313. The first cross brace 311 and the second cross brace 312 are fixedly connected between the mooring turret 44 and the pontoon 42. The third cross brace 313 is fixedly connected between the pontoon 42. The first cross brace 311, the second cross brace 312 and the third cross brace 313 are connected in an equilateral triangle, and the equilateral triangle formed by the connection is located directly above the base frame 1. The upper diagonal brace 32 is located at Above the lower cross brace 31, the upper diagonal brace 32 includes a first diagonal brace 321, a second diagonal brace 322, a third diagonal brace 323 and a fourth diagonal brace 324, the first diagonal brace 321 and the second diagonal brace 322 are fixedly connected between the truss body 41 and the mooring turret 44, and one end of the first diagonal brace 321 and the second diagonal brace 322 is located at the top of the truss body 41, the third diagonal brace 323 and the fourth diagonal brace 324 are fixedly connected between the truss body 41 and the pontoon 42, and the third diagonal brace 323 and the fourth diagonal brace 324 are staggered; The upper diagonal brace 32 and the lower transverse brace 31 are both flat pipes with an elliptical cross-section with pointed ends. The bottom portion of the pontoon 42 is disc-shaped, and the diameter edge significantly exceeds the pontoon 42. The interior of the pontoon 42 is hollow and contains ballast water or fixed ballast.

[0023] Optionally, in some embodiments, please refer to Figure 7 , the mooring turret 44 is a cylinder placed vertically at the sea level, the truss body 41 is the main structure of the floating foundation 3, in the form of a rigid three-dimensional conductor frame, extending from under the water surface to the air, and its part above the water surface; From the above, it can be seen that when the offshore floating wind power foundation platform is subjected to environmental loads and wind turbine loads, its part above the water surface will change with the change in the position of the pontoon 42 water surface box. At this time, when the draft of the pontoon 42 increases, the buoyancy of the pontoon 42 increases, and at the same time, the buoyancy center of the pontoon 42 on one side decreases, which increases the distance between the buoyancy centers of the pontoons 42 on both sides, thereby increasing the buoyancy force arm, and causing the restoring torque L that causes the pontoon 42 to return to a balanced state to increase.

[0024] The effect of such arrangement is that, by arranging the bottom part of the pontoon 42 to be disc-shaped, the diameter edge obviously exceeds the pontoon 42, and the discs are connected by flat box beams, so that the entire bottom box 43 disturbs the surrounding seawater to form a large heave damping when the floating foundation moves with the waves, thereby suppressing the heaving and swaying of the floating foundation 3 under the influence of environmental loads; By arranging the upper diagonal brace 32, the lower transverse brace 31 and the truss body 41 at 45 degrees, the position of the waterline surface of the pontoon 42 changes with the draft of the floating foundation 3, thereby increasing the restoring moment of the floating foundation 3, thereby accelerating the speed at which the floating foundation 3 recovers a stable floating state, and at the same time making the rising and falling amplitude and the shaking and tilting angle of the column smaller, thereby ensuring the power generation efficiency and safe operation of the wind turbine. In addition, by arranging the upper diagonal brace 32 and the lower transverse brace 31 to be flat pipes, the floating wind power foundation platform can achieve a small windward area while maintaining the same cross-sectional strength.

[0025] In some embodiments, please refer to Figures 3 to 6 The top of the truss body 41 is also fixedly connected to a main duct 6, the main duct 6 is tilted outward, the wind turbine 2 is fixedly installed inside the main duct 6, and a support rod 7 is also provided between the buoyancy box 42 and the mooring turret 44, one end of the support rod 7 is fixedly connected to a position near the bottom of the buoyancy box 42, and the other end of the support rod 7 is fixedly connected to a position near the top of the mooring turret 44; The mooring system 45 includes a mooring rope 451, a mooring point 452 and a mooring anchor point 453. The mooring point 452 is rotatably installed on a bottom box 43 located at the bottom of a mooring turret 44, and the mooring point 452 is located at the bottom end of the bottom box 43. The mooring rope 451 is fixedly connected to the mooring point 452, and the mooring anchor point 453 is fixedly connected to one end of the mooring rope 451 away from the mooring point 452.

[0026] Optionally, in some embodiments, the main conduit 6 directly below the base of the two wind turbines 2 is a slightly tapered cylindrical shape, and the remaining diagonal braces are flat pipes, and the bottom box 43 is a flat steel structure empty cabin located at the bottom of the floating foundation 3, which is submerged underwater for a long time; With such arrangement, when the real-time wind direction at sea changes, the offshore floating wind power foundation platform will be affected by the wind, and the mooring turret 44 will follow the wind direction and passively rotate coaxially around the mooring single point 452. When the wind turbine rotor faces the wind directly, the mooring turret 44 will stop rotating. When the wind force and wave direction are very different, the output power and rotor resistance of the wind turbine generator sets on both sides can be adjusted separately to form a deflection torque between the wind turbine generator sets 2 on both sides, so that the offshore floating wind power foundation platform will rotate with the maximum swept area under the action of wind force and waves.

[0027] The effect of such a setting is that, by setting the mooring system 45, the floating wind power foundation platform is passively coaxially rotated around the mooring single point 452 under the action of wind force, so as to keep the wind turbine rotor always facing the wind, realize the complete passive yaw function of the wind turbine set 2, and indirectly realize the precise adjustment of the direction of the wind turbine rotor of the fixed installation unit, thereby eliminating the yaw transmission components such as the large-diameter rotary gear ring, yaw motor, gear box and the like that are indispensable for the traditional wind turbine, and realize the optimization of system reliability and maintainability while reducing potential failure points; By arranging the two main ducts 6 to be tilted outward, a larger distance is formed between the top ends to facilitate the installation of two large wind turbines 2. At the same time, when the difference between the wind force and the wave direction is large, the output power and the wind wheel resistance of the two wind turbines are adjusted separately to form a deflection torque, thereby realizing the passive yaw function of active intervention, and obtaining the highest power generation efficiency with the maximum swept area.

[0028] In some embodiments, please refer to Figure 2 A fixing assembly 5 is further provided between the truss body 41 and the upper diagonal brace 32, and the fixing assembly 5 includes a first fixing rod 51, a second fixing rod 52, a third fixing rod 53 and a fourth fixing rod 54, wherein the first fixing rod 51 is fixedly installed between the truss body 41 and the first diagonal brace 321, the second fixing rod 52 is fixedly installed between the truss body 41 and the second diagonal brace 322, the third fixing rod 53 is fixedly installed between the bottom end of the truss body 41 and the bottom end of the first diagonal brace 321, and the fourth fixing rod 54 is fixedly installed between the bottom end of the truss body 41 and the bottom end of the second diagonal brace 322; The effect of such arrangement is that, by arranging the first fixing rod 51, the second fixing rod 52, the third fixing rod 53 and the fourth fixing rod 54, the truss body 41 and the upper diagonal brace 32, the lower transverse brace 31 for supporting the wind turbine 2 can form an indivisible complete structure with the buoyancy box 42, the bottom box 43, the mooring turret 44, etc., so that the offshore floating wind power foundation platform is integrated in design, and at the same time, the stability of the offshore floating wind power foundation platform and the firmness of the connection between the structures are strengthened.

[0029] From the above, we can see that the working principle of this application is as follows: The mooring turret 44 is precisely positioned in the plane through multiple mooring ropes 451 and mooring anchors 453 arranged in various directions and fixedly connected below the mooring single point 452. When the offshore floating wind power foundation platform is subjected to environmental loads and wind turbine loads, its part above the water surface will follow the change in the position of the pontoon 42 water surface box. At this time, when the draft of the pontoon 42 increases, the buoyancy and buoyancy arm of the pontoon 42 increase at the same time, which increases the restoring moment that causes the pontoon 42 to return to a balanced state, thereby accelerating the speed at which the floating foundation 3 returns to a stable floating state, and at the same time making the column heave amplitude and shaking tilt angle smaller, thereby ensuring the wind turbine power generation efficiency and safe operation. In addition, in the process of being subjected to environmental loads and wind turbine loads, the upper diagonal brace 32 and the lower horizontal brace 31 are both flat pipes, so that the floating wind power foundation platform can achieve a small windward area while maintaining the same cross-sectional strength; During the movement with the waves, the bottom part of the pontoon 42 is disc-shaped, and the edge of the diameter obviously exceeds the pontoon 42. The discs are connected by flat box beams, so that the entire bottom box 43 can disturb the surrounding seawater to form a large heave damping during the movement of the floating foundation with the waves, thereby suppressing the ups and downs and swaying of the floating foundation 3 under the influence of environmental loads.

[0030] When the real-time wind direction at sea changes, the offshore floating wind power foundation platform will be affected by the wind, and the mooring turret 44 will follow the wind direction and passively rotate coaxially around the mooring single point 452. When the wind turbine rotor is facing the wind, the mooring turret 44 will stop rotating. When the wind force and wave direction are very different, the output power and rotor resistance of the wind turbine generator sets on both sides can be adjusted separately to form a deflection torque between the wind turbine generator sets 2 on both sides. Under the action of the deflection torque and the hydraulic torque, the offshore floating wind power foundation platform will rotate with the maximum swept area under the action of wind and waves to obtain the highest power generation efficiency.

[0031] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A truss-type offshore floating wind power foundation platform, characterized in that: The invention comprises a base frame (1), a wind turbine generator set (2), a floating foundation (3) and a three-dimensional truss structure (4), wherein the three-dimensional truss structure (4) comprises a truss body (41), a pontoon (42), a base box (43), a mooring turret (44) and a mooring system (45), wherein the base frame (1) is arranged in the shape of an equilateral triangle, the pontoon (42) is fixedly connected to the upper surface of two vertices of the base frame (1), and the pontoon (42) is arranged at an inclination of 45 degrees, and the mooring turret (44) is fixedly connected to the upper surface of two vertices of the base frame (1). On the upper surface of another top corner, the bottom box (43) is fixedly connected to the three top corners of the bottom frame (1), the truss body (41) is fixedly mounted on the upper surface of the pontoon (42), and the truss body (41) is arranged at 45 degrees, the mooring system (45) is used for positioning the truss-type offshore floating wind power foundation platform on the sea surface, the wind turbine set (2) is used for wind power generation, and the floating foundation (3) is used to reduce the heave amplitude and the shaking tilt angle of the truss-type offshore floating wind power foundation platform.

2. A truss-type offshore floating wind power foundation platform according to claim 1, characterized in that: The floating foundation (3) comprises a lower cross brace (31) and an upper diagonal brace (32), wherein the lower cross brace (31) comprises a first cross brace (311), a second cross brace (312) and a third cross brace (313), wherein the first cross brace (311) and the second cross brace (312) are fixedly connected between the mooring turret (44) and the pontoon (42), and the third cross brace (313) is fixedly connected between the pontoons (42), wherein the first cross brace (311), the second cross brace (312) and the third cross brace (313) are connected in the form of an equilateral triangle, and the equilateral triangle formed by the connection is located directly above the base frame (1), and the upper diagonal brace (32) is located above the lower cross brace (31).

3. A truss-type offshore floating wind power foundation platform according to claim 2, characterized in that: The upper diagonal brace (32) comprises a first diagonal brace (321), a second diagonal brace (322), a third diagonal brace (323) and a fourth diagonal brace (324); the first diagonal brace (321) and the second diagonal brace (322) are fixedly connected between the truss body (41) and the mooring turret (44); one end of the first diagonal brace (321) and the second diagonal brace (322) are located at the top of the truss body (41); the third diagonal brace (323) and the fourth diagonal brace (324) are fixedly connected between the truss body (41) and the pontoon (42); and the third diagonal brace (323) and the fourth diagonal brace (324) are staggered.

4. A truss-type offshore floating wind power foundation platform according to claim 3, characterized in that: A fixing assembly (5) is also provided between the truss body (41) and the upper diagonal brace (32), and the fixing assembly (5) comprises a first fixing rod (51), a second fixing rod (52), a third fixing rod (53) and a fourth fixing rod (54), wherein the first fixing rod (51) is fixedly installed between the truss body (41) and the first diagonal brace (321), the second fixing rod (52) is fixedly installed between the truss body (41) and the second diagonal brace (322), the third fixing rod (53) is fixedly installed between the bottom end of the truss body (41) and the bottom end of the first diagonal brace (321), and the fourth fixing rod (54) is fixedly installed between the bottom end of the truss body (41) and the bottom end of the second diagonal brace (322).

5. A truss-type offshore floating wind power foundation platform according to claim 4, characterized in that: The top end of the truss body (41) is also fixedly connected to a main duct (6), the main duct (6) is arranged to be inclined outward, and the wind turbine set (2) is fixedly mounted inside the main duct (6).

6. The truss-type offshore floating wind power foundation platform according to claim 1, characterized in that: The mooring system (45) comprises a mooring rope (451), a mooring point (452) and a mooring anchor point (453); the mooring point (452) is rotatably mounted on a bottom box (43) located at the bottom of a mooring turret (44); the mooring point (452) is located at the bottom end of the bottom box (43); the mooring rope (451) is fixedly connected to the mooring point (452); and the mooring anchor point (453) is fixedly connected to an end of the mooring rope (451) away from the mooring point (452).

7. A truss-type offshore floating wind power foundation platform according to claim 6, characterized in that: A support rod (7) is also provided between the buoyancy box (42) and the mooring turret (44), one end of the support rod (7) being fixedly connected to a position near the bottom of the buoyancy box (42), and the other end of the support rod (7) being fixedly connected to a position near the top of the mooring turret (44).

8. A truss-type offshore floating wind power foundation platform according to any one of claims 2 to 4, characterized in that: The upper diagonal brace (32) and the lower transverse brace (31) are both flat pipes, and the cross-section is an ellipse with sharp ends. The bottom portion of the pontoon (42) is disc-shaped, and the edge of the diameter obviously exceeds the pontoon (42). The interior of the pontoon (42) is arranged to be hollow, and ballast water or fixed ballast is placed inside the pontoon (42).

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