Floating type offshore wind power platform

Abstract

The invention relates to the technical field of offshore wind power, and discloses a floating type offshore wind power platform. The floating type offshore wind power platform comprises a stand column assembly, a first supporting assembly and a mooring assembly. The stand column assembly comprises a middle stand column and a plurality of side stand columns, the side stand columns are arranged at intervals in the circumferential direction of the middle stand column, and each side stand column is provided with a moon pool structure. The middle stand columns are connected with the side stand columns through first supporting assemblies. The other end of the mooring assembly is connected with the seabed. According to the offshore wind power platform, additional loads caused by part of waves and wind are offset by arranging the moon pool structure, the overall load of the wind power platform is reduced, damping of the whole platform to external excitation such as waves and wind is increased, the motion response of the platform is reduced, the motion amplitude of the wind power platform in the directions of heaving, rolling and pitching is effectively controlled, and the service life of the platform is prolonged. And the motion performance is optimized. The stability of the platform is improved, the wind generating set operates stably, the power generation efficiency is improved, and the kilowatt-hour cost is reduced.

Description

Technical Field

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

[0002] According to statistics, the cumulative installed capacity of floating wind power in the world has reached 235.95MW, of which China's cumulative installed capacity has reached 22.95MW, accounting for about 10% of the world's total installed capacity. Floating offshore wind power refers to the technology of using floating structures to support wind turbines to generate electricity at sea. The floating structure is connected to the seabed by a mooring system. It has the advantages of economy and convenient construction and installation in deep sea areas over 60 meters, becoming an inevitable choice for the development of deep sea wind power.

[0003] Floating offshore wind power can be divided into barge type, single column type, semi-submersible type and tension leg type according to its floating structure. The four-column offshore wind power platform is a semi-submersible floating structure. As the name implies, this floating offshore wind power platform has four columns, one of which is located in the center. A wind turbine can be installed on this column. The other three side columns are arranged in an equilateral triangle on the outside of the middle column with the middle column as the center. Due to the large waterline area, the existing four-column floating offshore wind power platform is subject to large additional loads from waves and sea breezes, a large overall movement range of the platform, and poor stability, resulting in reduced power generation efficiency of the wind turbine and increased cost per kilowatt-hour. Summary of the invention

[0004] In view of this, the present invention provides a floating offshore wind power platform to solve the problem that the existing four-column floating offshore wind power platform is subject to large additional loads from waves and sea breeze, large overall movement amplitude of the platform, and poor stability, which leads to reduced power generation efficiency of the wind power generation group and increased cost per kilowatt-hour.

[0005] In a first aspect, the present invention provides a floating offshore wind power platform, comprising:

[0006] A column assembly, the column assembly comprising: a middle column and a plurality of side columns, the plurality of side columns are circumferentially spaced around the middle column, and each of the side columns is provided with a moon pool structure;

[0007] a first support assembly, wherein the intermediate column is connected to the side column via the first support assembly;

[0008] A mooring component, one end of which is connected to the column component, and the other end of which is connected to the seabed.

[0009] Beneficial Effects

[0010] The moon pool structure set on the side column can offset part of the additional load caused by waves and wind through the oscillation of fluid in the moon pool structure, thereby reducing the overall load of the wind power platform, and at the same time increasing the damping of the entire floating offshore wind power platform to external excitations such as waves and wind, reducing the motion response of the platform, and effectively controlling the movement amplitude of the offshore wind power platform in heave, roll and pitch, and optimizing the motion performance. This improves the stability of the floating offshore wind power platform, enables the wind turbine to operate stably, improves power generation efficiency, and reduces the cost of electricity.

[0011] In an optional embodiment, the moon pool structure is a hollow channel that passes through the top and bottom surfaces of the side columns.

[0012] Beneficial Effects

[0013] The moon pool structure is such a hollow channel. When the floating offshore wind power platform is set at sea, seawater can flow into the hollow channel and oscillate in the hollow channel, thereby increasing the damping of the wind power platform to external excitations such as waves and wind, reducing the movement response of the floating wind power platform, making the floating wind power platform more stable, and reducing the overall load and cost of the floating wind power platform.

[0014] In an optional embodiment, the cross-section of the hollow channel perpendicular to the axial direction of the side column is square.

[0015] Beneficial Effects

[0016] This shape of moon pool structure produces a stronger flow separation effect, that is, it can produce higher damping and further reduce the response amplitude.

[0017] In an optional embodiment, the column assembly includes three side columns, each of the side columns is equidistant from the middle column, and an angle between two adjacent side columns is 120°.

[0018] Beneficial Effects

[0019] The three side columns are arranged in an equilateral triangle and connected to the middle column, so as to form a stable column support system and ensure the stability of the wind turbine generator set arranged on the middle column.

[0020] In an optional embodiment, the first supporting assembly includes: a plurality of first connecting members, one end of the first connecting member is connected to the middle column, the other end is connected to the side column, and the axial direction of the first connecting member is perpendicular to the axial direction of the middle column.

[0021] Beneficial Effects

[0022] The middle column and the side column are connected by the first connecting member to form a main load-bearing structure to resist the bending moment of the wind turbine generator set, ensuring that the wind turbine generator set is stably set on the middle column and will not fall over, and can stably operate to perform wind power generation.

[0023] In an optional embodiment, the floating offshore wind power platform also includes a second support assembly, the second support assembly includes a plurality of second connecting members, one second connecting member is arranged between every two adjacent first connecting members, and the axial direction of the second connecting member is perpendicular to the axial direction of the intermediate column.

[0024] Beneficial Effects

[0025] The two adjacent first connecting members are connected by the second connecting member to form a main load-bearing structure for resisting the torsional moment of wave load, so that the floating offshore wind power platform has good wave impact resistance and better structural stability.

[0026] In an optional embodiment, a diameter of the first connecting member is greater than a diameter of the second connecting member.

[0027] Beneficial Effects

[0028] Because the first connector is mainly used to resist the bending moment of a large-scale wind turbine generator set, and the second connector is mainly used to resist the torsion moment of wave loads, making the diameter of the first connector larger than the diameter of the second connector not only meets the stability requirements of the heavy wind turbine generator set, but also reduces the overall weight of the floating offshore wind power platform as much as possible, reducing the engineering workload.

[0029] In an optional embodiment, the floating offshore wind power platform further includes a diagonal brace assembly, wherein the diagonal brace assembly includes a plurality of inclined cables, wherein the top ends of the inclined cables are connected to the intermediate columns, and the bottom ends of the inclined cables are connected to the first connecting member.

[0030] Beneficial Effects

[0031] The setting of the inclined cable can resist the tension. When the middle column is subjected to the load bending moment of the wind turbine generator set, the corresponding inclined cable will be tightened to provide reverse torque, thereby improving the bending moment resistance performance of the middle column.

[0032] In an optional embodiment, the mooring assembly includes a plurality of mooring cables, one end of each mooring cable is connected to the side column, and the other end of each mooring cable is connected to the seabed.

[0033] In an optional embodiment, one end of the mooring cable is connected to the bottom end of the side column.

[0034] Beneficial Effects

[0035] When the mooring cable acts on the offshore wind power platform structure, an axial force is mainly generated in the first connecting member, which can better exert the tensile properties of the steel structure of the first connecting member. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a front view of a floating offshore wind power platform according to an embodiment of the present invention;

[0038] Figure 2 A top view of a floating offshore wind power platform according to an embodiment of the present invention;

[0039] Figure 3 It is a line graph of wave period and pitch response amplitude of offshore wind power platform.

[0040] Description of reference numerals:

[0041] 11. Middle column, 12. Side column, 13. Moon pool structure;

[0042] 21. A first connecting member;

[0043] 31. A second connecting member;

[0044] 41. Stay cable;

[0045] 51. Mooring line. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0051] According to an embodiment of the present invention, on the one hand, a floating offshore wind power platform is provided, and the floating offshore wind power platform includes: a column assembly, a first support assembly and a mooring assembly. The column assembly includes: an intermediate column 11 and a plurality of side columns 12, wherein the plurality of side columns 12 are arranged circumferentially around the intermediate column 11, and each side column 12 is provided with a moon pool structure 13. The intermediate column 11 is connected to the side column 12 through the first support assembly. One end of the mooring assembly is connected to the column assembly, and the other end is connected to the seabed.

[0052] In the column assembly, multiple side columns 12 are arranged around the middle column 11 with the middle column 11 as the center, and both the middle column 11 and the side columns 12 are cylindrical. The middle column 11 is connected to each side column 12 through the first support assembly to form a load-bearing structure, and each side column 12 is provided with a moon pool structure 13. The mooring assembly connects the seabed and the column assembly to ensure that the offshore wind power platform floats on the sea surface, and the wind turbine generator set is arranged on the middle column 11. The offshore wind power platform provides an installation foundation for the wind turbine generator set, so that the wind turbine generator set can use the wind energy resources at sea to generate wind power.

[0053] This floating offshore wind power platform can achieve the following effects by arranging the moon pool structure 13 on the side columns 12:

[0054] (1) It can improve the damping of the platform system: The moon pool structure 13 can increase the damping of the floating offshore wind power platform to external excitations such as waves and wind through the oscillation of its internal fluid (seawater), thereby reducing the motion response of the floating offshore wind power platform. The increased damping of the floating offshore wind power platform can make it more stable, reduce fatigue damage to structural parts, and extend the service life of the floating offshore wind power platform.

[0055] (2) Optimizing motion performance: The fluid motion in the moon pool can be coupled with the motion of the floating offshore wind power platform, which can effectively control the amplitude of the offshore wind power platform's heave, roll, and pitch movements, thereby optimizing its motion performance.

[0056] (3) Reducing additional loads and costs: The moon pool structure 13 reduces the motion amplitude of the floating offshore wind power platform. For tall structures such as wind turbines and towers, reducing the motion amplitude can reduce the wind turbine load on the offshore wind power platform, thereby reducing the overall load and structural construction cost.

[0057] (4) Improve the power generation efficiency of wind turbines: By increasing the damping of external excitation, reducing additional loads, and reducing the movement amplitude of floating offshore wind power platforms, the floating offshore wind power platforms are more stable, and the wind turbines can operate continuously and stably, thereby improving the power generation efficiency of wind turbines and reducing the cost per kilowatt-hour.

[0058] In one embodiment, the column assembly includes three side columns 12 , each side column 12 is equidistant from the middle column 11 , and the angle between two adjacent side columns 12 is 120°.

[0059] That is, in the four-column offshore wind power platform adopted in this embodiment, three side columns 12 are arranged in an equilateral triangle with the middle column 11 as the center, that is, each side column 12 is arranged at a vertex of the equilateral triangle. The wind turbine generator set is installed on the middle column 11, and the moon pool structure 13 is arranged on each side column 12.

[0060] The three side columns 12 are connected with the middle column 11 to form a stable triangular support system with better support performance and higher stability.

[0061] In other embodiments, the number of the side pillars 12 may also be four or other numbers.

[0062] In some embodiments, the moon pool structure 13 is a hollow passage that passes through the top and bottom surfaces of the side columns 12 .

[0063] The moon pool structure 13 is a hollow channel arranged along the axial direction of the side column 12. The lower end of the hollow channel is a water inlet, and seawater can enter the hollow channel.

[0064] By opening a hollow channel in the side column 12 to form a moon pool structure 13, the damping of the floating offshore wind power platform can be increased. Damping, as a key property causing energy dissipation, is mainly caused by the piston damping generated by waves entering the hollow channel and the damping caused by fluid separation at the water inlet at the bottom end of the hollow channel.

[0065] The equation of motion for a floating offshore wind power platform is as follows:

[0066]

[0067] Where M is the mass matrix of the offshore wind power platform, A(ω) is the additional mass matrix of the offshore wind power platform, is the acceleration vector of the whole system, B(ω) is the damping matrix of the offshore wind power platform, is the velocity vector of the whole system, C is the stiffness matrix of the offshore wind power platform, η is the six-degree-of-freedom displacement vector of the whole system, F exc The moon pool structure 13 is an external excitation force, mainly wind load and wave load. The moon pool structure 13 can improve the damping of the floating offshore wind power platform, that is, the damping term B(ω) in the motion equation is improved, and the motion amplitude of the floating offshore wind power platform caused by the wave incident is reduced, and η (that is, the six-degree-of-freedom displacement vector of the overall system) will be reduced, that is, the motion amplitude of the floating offshore wind power platform will be reduced.

[0068] The moon pool structure 13 will have a certain impact on the motion response amplitude of the floating offshore wind power platform. Taking the pitch motion as an example, Figure 3 The figure shows the effect of the moon pool structure 13 on the pitch motion of the floating offshore wind power platform. The horizontal axis is the incident wave period, and the vertical axis is the pitch response amplitude (which means the motion response amplitude of the floating offshore wind power platform under the influence of the incident wave when the amplitude is unit amplitude). The line a in the figure is a floating offshore wind power platform without the moon pool structure 13, and the line b is an offshore wind power platform with the moon pool structure 13. Figure 3It can be seen that for extreme working conditions, the wave period is long and the wave height is high, corresponding to the "period interval T3" in the figure. The damping effect brought by the moon pool structure 13 reduces the pitch response of the floating offshore wind power platform, and can also reduce the inertial force load of tall structures such as the tower of the wind turbine generator set, which is beneficial to the offshore wind power platform to reduce the amount of structural steel and reduce construction costs. The application of the moon pool structure 13 makes the offshore wind power platform have the "vanishing period" characteristic of motion response. Corresponding to the "period interval T2" in the figure, it can be seen that the pitch motion amplitude of the floating offshore wind power platform with the moon pool structure 13 is very low. For power generation conditions, the wave period is relatively short. By controlling the draft depth of the floating offshore wind power platform, the width of the moon pool section and other parameters, the "vanishing period" effect brought by the moon pool structure 13 is matched with the wave period of the floating offshore wind power platform during power generation conditions, so that the floating offshore wind power platform can maintain a very stable wind posture when encountering waves of the corresponding period of the "period interval T2", thereby improving power generation efficiency and the number of available hours throughout the year. The application of the moon pool structure 13 will bring about the sloshing resonance phenomenon corresponding to the "period interval T1", that is, the motion response amplitude becomes higher, but the corresponding wave period is smaller. Generally, waves with smaller periods have smaller wave heights due to the limitations of the wave steepness relationship and have less impact on the platform.

[0069] In general, the damping provided by the moon pool structure 13 can reduce the motion response amplitude under all working conditions, especially extreme environmental conditions, reduce environmental loads, and thus reduce construction costs; and the disappearance period brought by the moon pool structure 13 can improve the platform stability under power generation conditions, thereby improving power generation efficiency and available hours.

[0070] In one embodiment, the cross section of the hollow channel perpendicular to the axial direction of the side column 12 is a square.

[0071] That is, in this embodiment, the shape of the hollow channel is a rectangular parallelepiped, and its top and bottom surfaces are both square. The line connecting the center of the top surface and the center of the bottom surface of the rectangular parallelepiped coincides with the axis of the side column 12. This shape of the moon pool structure 13 produces a stronger flow separation effect, that is, it can produce higher damping and further reduce the response amplitude.

[0072] In other embodiments, the hollow channel may also be in other shapes such as a cylinder.

[0073] In some embodiments, the first support assembly includes: a plurality of first connecting members 21 , one end of the first connecting member 21 is connected to the middle column 11 , the other end is connected to the side column 12 , and the axial direction of the first connecting member 21 is perpendicular to the axial direction of the middle column 11 .

[0074] Specifically, the first connecting member 21 is a rigid round rod, and each side column 12 is connected to the middle column 11 through a first connecting member 21. The connection position is located at the bottom end of the side wall of the middle column 11 and the side column 12, and the axial direction of each first connecting member 21 is perpendicular to the axial direction of the middle column 11 and the side column 12. The connection method can be a fixed connection method such as welding. In this embodiment, three side columns 12 are provided, that is, three first connecting members 21 need to be provided, and the angle between two adjacent first connecting members 21 is 120°. The first connecting member 21 is generally a steel rod, and an anti-corrosion and anti-rust treatment can be performed on its surface to prevent the corrosion of the first connecting member 21 by seawater and affect its supporting performance.

[0075] The middle column 11, the first connecting member 21 and the side column 12 are connected to form a main load-bearing structure to resist the bending moment of the wind turbine generator set, ensuring that the wind turbine generator set is stably set on the middle column 11 and will not fall over, and can stably operate to perform wind power generation.

[0076] In other embodiments, the shape of the first connecting member 21 may also be other shapes such as a square rod.

[0077] In some embodiments, the floating offshore wind power platform also includes a second support assembly, which includes a plurality of second connecting members 31 , a second connecting member 31 is arranged between every two adjacent first connecting members 21 , and the axial direction of the second connecting member 31 is perpendicular to the axial direction of the middle column 11 .

[0078] Specifically, the second connecting member 31 is also a rigid round rod, and two adjacent first connecting members 21 are connected by a second connecting member 31, that is, one end of the second connecting member 31 is connected to one of the two adjacent first connecting members 21, and the other end is connected to the other one, and the connection position between the second connecting member 31 and the first connecting member 21 is close to the side column 12. The axial direction of each second connecting member 31 is perpendicular to the axial direction of the middle column 11 and the side column 12, and the axial direction of the second connecting member 31 is set at an angle to the axial direction of the first connecting member 21. In this embodiment, three first connecting members 21 are provided, and three second connecting members 31 also need to be provided. The angle between two adjacent second connecting members 31 is 60°. As shown in FIG. Figure 2 From the top view shown, the three second connecting members 31 approximately form an equilateral triangle. The second connecting member 31 is generally also a steel rod, and its surface can be treated with anti-corrosion and anti-rust to prevent seawater from corroding the second connecting member 31 and affecting its supporting performance.

[0079] The connected first connectors 21 and second connectors 31 form a main load-bearing structure for resisting the torsional moment of wave loads, so that the floating offshore wind power platform has good wave impact resistance, is not easy to rotate under wave impact, and has better stability.

[0080] In other embodiments, the second connecting member 31 may also be in other shapes such as a square rod.

[0081] In some embodiments, the diameter of the first connecting member 21 is greater than the diameter of the second connecting member 31 .

[0082] like Figure 1 As shown, the first connector 21 and the second connector 31 are both steel rods, but the diameter of the first connector 21 is larger than that of the second connector 31. This is because the first connector 21 is mainly used to withstand the bending moment of the wind turbine generator set, and the weight of the wind turbine generator set is large, so the bending moment borne by the first connector 21 is relatively large, and the thicker first connector 21 can meet the use requirements. Relatively speaking, the second connector 31 is mainly used to withstand the torsional moment of wave loads, and the moment is relatively small. The thinner second connector 31 can reduce the overall weight of the floating offshore wind power platform as much as possible on the basis of meeting the use requirements, reduce the raw materials required for building the floating offshore wind power platform, and reduce the production cost.

[0083] In some embodiments, the floating offshore wind power platform further includes a diagonal brace assembly, which includes a plurality of inclined cables 41 , the top ends of the inclined cables 41 are connected to the middle column 11 , and the bottom ends are connected to the first connector 21 .

[0084] Specifically, the inclined cables 41 in this embodiment are made of nylon, polyester fiber, etc., that is, the inclined cables 41 are flexible members. The top end of each inclined cable 41 is connected to the side wall of the middle column 11, and the bottom end is connected to the middle of the first connecting member 21. In this embodiment, the number of the first connecting members 21 is three, and the number of the corresponding inclined cables 41 is also three.

[0085] The arrangement of the inclined cable 41 can resist the tension, and when the middle column 11 is subjected to the load bending moment of the wind turbine generator set, the corresponding inclined member will be tightened to provide a reverse moment, thereby improving the bending moment resistance performance of the middle column 11. Moreover, the inclined cable 41 is easy to replace and repair.

[0086] In other embodiments, the inclined cable 41 may also be replaced by a steel round rod such as the first connecting member 21 and the second connecting member 31 .

[0087] In one embodiment, the mooring assembly includes a plurality of mooring cables 51 , one end of the mooring cables 51 is connected to the side column 12 , and the other end of the mooring cables 51 is connected to the seabed.

[0088] The mooring cable 51 is usually made of high-strength, wear-resistant and corrosion-resistant materials such as polyester fiber, nylon or steel wire rope. The mooring cable 51 can prevent the offshore wind power platform from drifting away. In this embodiment, the number of side columns 12 is three, and the number of corresponding mooring cables 51 is also three.

[0089] In one embodiment, one end of the mooring line 51 is connected to the bottom end of the side column 12 .

[0090] like Figure 1 As shown, the mooring cable 51 is connected to the bottom end of the side column 12, so that the mooring cable 51 will not form a bending moment on the side column 12 when transmitting the load, which is more beneficial to the force of the side column 12. When the mooring cable 51 acts on the offshore wind power platform structure, it mainly generates an axial force in the first connecting member 21, which can better exert the tensile properties of the steel structure of the first connecting member 21.

[0091] The working process of the floating offshore wind power platform provided in this embodiment is described as follows:

[0092] One end of the mooring cable 51 is connected to the seabed, and the other end is connected to the bottom of the side column 12, and then the wind turbine generator set is set on the middle column 11. When the wind turbine generator set uses wind energy to generate electricity during its service, the moon pool structure 13 set on the side column 12 can offset part of the additional load caused by waves and wind by the oscillation of fluid (seawater) in the moon pool structure 13, so as to reduce the overall load of the wind power platform, and at the same time increase the damping of the entire floating offshore wind power platform to external excitations such as waves and wind, reduce the motion response of the platform, effectively control the movement amplitude of the wind power platform in the directions of heave, roll and pitch, and optimize the motion performance. Thereby improving the stability of the floating offshore wind power platform, making the wind turbine generator set operate stably, improving the power generation efficiency, and reducing the cost per kilowatt-hour.

[0093] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A floating offshore wind power platform, characterized in that: include: A column assembly, the column assembly comprising: a middle column (11) and a plurality of side columns (12), the plurality of side columns (12) being arranged at intervals around the middle column (11), and each of the side columns (12) being provided with a moon pool structure (13); A first support assembly, wherein the middle column (11) is connected to the side column (12) via the first support assembly; A mooring component, one end of which is connected to the column component, and the other end of which is connected to the seabed.

2. The floating offshore wind power platform according to claim 1, characterized in that: The moon pool structure (13) is a hollow channel that penetrates the top and bottom surfaces of the side columns (12).

3. The floating offshore wind power platform according to claim 2, characterized in that: The cross section of the hollow channel perpendicular to the axial direction of the side column (12) is square.

4. The floating offshore wind power platform according to claim 1, characterized in that: The column assembly comprises three side columns (12), each of the side columns (12) is equidistant from the middle column (11), and the angle between two adjacent side columns (12) is 120°.

5. The floating offshore wind power platform according to claim 1, characterized in that: The first supporting assembly comprises: a plurality of first connecting members (21), one end of each of the first connecting members (21) being connected to the middle column (11), and the other end of each of the first connecting members (21) being connected to the side column (12), and the axial direction of the first connecting member (21) being perpendicular to the axial direction of the middle column (11).

6. The floating offshore wind power platform according to claim 5, characterized in that: It also includes a second support assembly, which includes a plurality of second connecting members (31), one second connecting member (31) is arranged between every two adjacent first connecting members (21), and the axial direction of the second connecting member (31) is perpendicular to the axial direction of the middle column (11).

7. The floating offshore wind power platform according to claim 6, characterized in that: The diameter of the first connecting member (21) is greater than the diameter of the second connecting member (31).

8. The floating offshore wind power platform according to claim 5, characterized in that: It also includes a diagonal brace assembly, which includes a plurality of inclined cables (41), the top ends of the inclined cables (41) are connected to the middle column (11), and the bottom ends are connected to the first connecting member (21).

9. The floating offshore wind power platform according to any one of claims 1 to 8, characterized in that: The mooring assembly comprises a plurality of mooring cables (51), one end of each mooring cable (51) is connected to the side column (12), and the other end of each mooring cable (51) is connected to the seabed.

10. The floating offshore wind power platform according to claim 9, characterized in that: One end of the mooring cable (51) is connected to the bottom end of the side column (12).

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