Semi-submersible type floating platform and floating type wind turbine generator

Abstract

The invention discloses a semi-submersible type floating platform and a floating type wind turbine generator, and relates to the technical field of wind power generation, and the semi-submersible type floating platform comprises a center buoy, a center connecting module surrounding the center buoy, a plurality of bypass beams extending outwards in the radial direction of the center connecting module and fixedly connected with the center connecting module, and a plurality of peripheral buoys. The center connecting module is fixedly connected with the center buoy, and each peripheral buoy is fixedly connected with the end, away from the center connecting module, of the bypass beam. The outer side face, away from the center buoy, of each peripheral buoy is anchored to the seabed through a first mooring rope, and different first mooring ropes are anchored to different positions of the seabed. The inner side face, close to the center buoy, of each peripheral buoy is connected to a shared ballast weight below the center buoy through a second mooring line. According to the semi-submersible floating platform, the six-degree-of-freedom movement of the floating body is effectively restrained through the mode of multi-point anchoring to the seabed and the connection mode of sharing the ballast weight, and the overall stability of the semi-submersible floating platform is improved.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a semi-submersible floating platform and a floating wind turbine. Background Technology

[0002] With the growing global demand for renewable energy, offshore wind power has become an important direction for energy transition due to its abundant wind energy resources and the fact that it does not occupy land space. Traditional fixed offshore wind turbines are usually installed in shallow waters and fixed to the seabed by pile foundations. However, as development areas extend into deeper waters (water depths exceeding 50 meters), fixed structures face soaring costs and technological bottlenecks, leading to the emergence of floating wind power platforms. These platforms are supported by buoyancy and anchored to the seabed, enabling stable operation in deep waters and becoming a core technology for deep-sea wind power development.

[0003] Currently, mainstream semi-submersible floating wind turbine platforms are connected to a single-point anchor on the seabed via mooring cables. For example, CN120039351A discloses a gravity-type variable-length single-point mooring connection device for floating wind turbines. Each mooring cable connects to a shared underwater weight at one end via a corresponding guide cable, and to the single-point anchor on the seabed at the other end. However, this single-point anchor design is difficult to effectively suppress the six degrees of freedom motion of the floating body (i.e., the floating wind turbine platform). Especially when encountering severe sea conditions such as strong winds, large waves, and strong currents, the swaying amplitude of the floating body is significant, which not only affects the normal operation of the wind turbine and reduces power generation efficiency, but may also pose a threat to equipment and personnel safety. Summary of the Invention

[0004] In view of the above problems, this application provides a semi-submersible floating platform and a floating wind turbine to solve the problem that existing technologies using single-point anchors on the seabed cannot effectively suppress the six degrees of freedom motion of the floating body. The specific solution is as follows:

[0005] The first aspect of this application provides a semi-submersible floating platform, comprising:

[0006] Center buoy;

[0007] A central connecting module surrounds the central buoy, and the central connecting module is fixedly connected to the central buoy;

[0008] Multiple bypass beams extending radially outward along the central connecting module and fixedly connected to the central connecting module;

[0009] Multiple peripheral buoys, each of which is fixedly connected to the end of the bypass beam furthest from the central connecting module;

[0010] The outer side of each peripheral buoy away from the central buoy is anchored to the seabed via a first mooring cable, with different first mooring cables anchored at different locations on the seabed; the inner side of each peripheral buoy near the central buoy is connected to a shared ballast load below the central buoy via a second mooring cable.

[0011] In one possible implementation, the outer pontoon is a hollow structure, and the central pontoon is a hollow structure or a structure with storage space.

[0012] In one possible implementation, the bypass beam comprises two parallel beams with a gap between them, through which the second mooring cable passes to connect to the shared ballast load.

[0013] In one possible implementation, a grooved connector is provided in the gap to connect the two beams, and the grooved connector is located at the center of the two beams along their own length direction;

[0014] The second mooring cable is connected to the shared ballast weight via the groove of the groove connector.

[0015] In one possible implementation, the groove connector is a pulley, which is rotatably disposed in the gap between the two beams, and the axis of rotation of the pulley is perpendicular to its own length direction.

[0016] In one possible implementation, the bottom surface of the central pontoon is higher than the bottom surface of the outer pontoons, and the height difference is greater than or equal to the height of the shared ballast load.

[0017] In one possible implementation, the number of peripheral buoys is three; the three peripheral buoys are evenly distributed around the central buoy, and the positions where the second mooring cables corresponding to the three peripheral buoys are connected to the shared ballast weight are evenly distributed.

[0018] The second aspect of this application provides a floating wind turbine, comprising: a wind turbine and a semi-submersible floating platform of the first aspect or any implementation thereof;

[0019] The wind turbine unit includes a wind turbine and a tower fixedly connected to the wind turbine;

[0020] The end of the tower furthest from the wind turbine is fixedly connected to the central pontoon of the semi-submersible floating platform.

[0021] In one possible implementation, the tower is a hollow structure.

[0022] In one possible implementation, the tower and the central pontoon are fixedly connected by a flange.

[0023] Using the above technical solution, the semi-submersible floating platform provided in this application includes: a central buoy, a central connecting module surrounding the central buoy, multiple bypass beams extending radially outward along the central connecting module and fixedly connected to the central connecting module, and multiple peripheral buoys. The central connecting module is fixedly connected to the central buoy, and each peripheral buoy is fixedly connected to the end of the bypass beam away from the central connecting module. The outer side of each peripheral buoy away from the central buoy is anchored to the seabed via a first mooring cable, with different first mooring cables anchored at different positions on the seabed; the inner side of each peripheral buoy near the central buoy is connected to a shared ballast load below the central buoy via a second mooring cable. Thus, the multiple peripheral buoys of this application are anchored to different positions on the seabed via first mooring cables, achieving the use of multiple anchor bodies to resist the horizontal impact force of environmental loads, effectively suppressing the six degrees of freedom motion of the floating body. Meanwhile, multiple outer buoys are connected to a shared ballast load below the central buoy via a second mooring cable. When the buoy moves, the shared ballast load moves up and down and left and right, and the effective length of the second mooring cable changes accordingly, generating a mooring system restoring force, which further suppresses the six-degree-of-freedom motion of the buoy and improves the overall stability of the semi-submersible floating platform. Attached Figure Description

[0024] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0025] Figure 1 A structural schematic diagram of a semi-submersible floating platform provided in this application;

[0026] Figure 2 A schematic diagram illustrating the connection between the semi-submersible floating platform, mooring system, and shared ballast load provided in this application;

[0027] Figure 3 A schematic diagram of the connection structure between a bypass beam and a second mooring cable provided in this application;

[0028] Figure 4 This is a schematic diagram of the structure for installing pulleys on the bypass beam provided in this application;

[0029] Figure 5 A schematic diagram of the structure integrating the semi-submersible floating platform and shared ballast load provided in this application;

[0030] Figure 6 A schematic diagram illustrating the in-situ state of the shared ballast load provided in this application;

[0031] Figure 7This application provides a structural schematic diagram of a floating wind turbine.

[0032] Figure 8 A front view of a floating wind turbine provided in this application. Detailed Implementation

[0033] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0034] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0035] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0036] First, the relevant terms used in this application will be explained to facilitate understanding below.

[0037] Floating wind power platform: an offshore wind power generation device that is supported by buoyancy and anchored to the seabed, capable of stable operation in deep water areas and supporting wind turbine generators to generate electricity.

[0038] Semi-submersible structure platform: A floating platform design that provides buoyancy through partially submerged columns, has a low center of gravity, is suitable for medium sea state environments, and has good horizontal stability.

[0039] Mooring system: An anchoring device consisting of anchor chains, cables, etc., connects the platform to the seabed, restricts its horizontal displacement, and allows a certain range of dynamic response.

[0040] High-performance fiber polyester cable: Polyester cable made from high-performance fibers, with characteristics such as high strength and low elongation, is often used in special fields such as marine engineering.

[0041] Six degrees of freedom motion: In three-dimensional space, an object can perform six independent motions, including translation in three directions (up and down, left and right, forward and backward) and rotation in three directions (rotation about each axis).

[0042] As introduced in the background technology, the current mainstream semi-submersible floating wind power platforms are connected to a single-point anchor on the seabed via mooring cables. However, this design of the single-point anchor on the seabed makes it difficult to suppress the six-degree-of-freedom motion of the floating body, resulting in poor platform stability.

[0043] Furthermore, since all environmental loads exert enormous horizontal impacts on the floating body, these must be resisted by a single anchor. Under the massive impact of extreme waves, the anchor bears peak loads far exceeding the average value, easily reaching its tensile or pull-out limits and posing safety risks. At the same time, the single-point anchoring method relies on the interaction of specific soil types to provide resistance. If the seabed is a soft muddy seabed, the anchor is prone to slippage, leading to the failure of horizontal restraints, increased floating body offset, and consequently, sudden tension changes in the mooring cable, causing it to break, which also poses safety risks.

[0044] To address the issues of insufficient stability and safety risks of offshore wind power platforms under complex sea conditions, and to achieve stable operation and efficient power generation of wind turbines at sea, this application provides a semi-submersible floating platform and a floating wind turbine.

[0045] Next, we will first introduce the semi-submersible floating platform (i.e., semi-submersible structural platform) provided in this application.

[0046] See Figure 1 The diagram shown is a structural schematic of a semi-submersible floating platform provided in this application. The semi-submersible floating platform includes a central buoy 11, a central connecting module 12 surrounding the central buoy, multiple bypass beams 13, and multiple peripheral buoys 14.

[0047] like Figure 1 The central connecting module 12 is fixedly connected to the central buoy 11, the bypass beam 13 extends radially outward along the central connecting module 12 and is fixedly connected to the central connecting module 12, and each peripheral buoy 14 is fixedly connected to the end of the corresponding bypass beam 13 away from the central connecting module 12.

[0048] As can be seen, the semi-submersible floating platform provided in this application adopts a four-column semi-submersible structure design, with multiple outer buoys arranged around the central buoy to provide buoyancy and stabilize the platform.

[0049] To further improve Figure 1 The stability and safety of the semi-submersible floating platform shown are as follows: Figure 2 The diagram shown illustrates the connection between the semi-submersible floating platform, mooring system, and shared ballast provided in this application.

[0050] like Figure 2 Each outer buoy 14 has its outer side away from the central buoy 11 anchored to the seabed via a first mooring cable 21, with different first mooring cables 21 anchored to different positions on the seabed.

[0051] By anchoring to the seabed at multiple points, the six degrees of freedom motion of the semi-submersible floating platform can be suppressed, improving its stability. Even if one of the first mooring cables breaks due to the enormous impact force caused by complex sea conditions, the remaining first mooring cables will still secure the semi-submersible floating platform, preventing it from collapsing and endangering equipment and personnel. At the same time, multi-point anchoring also reduces dependence on hard seabed soil, further improving its safety and stability.

[0052] Optionally, for ease of installation, the mooring point of the first mooring cable on the outer side of the outer buoy 14 can be located above the sea surface or slightly submerged in the sea surface (i.e., the submerged distance does not exceed a preset distance threshold).

[0053] Considering that the first mooring cable is located above the sea surface, the semi-submersible floating platform may become unstable due to wind impact, wave action, and collisions with floating objects. Therefore, for stability reasons, the mooring point of the first mooring cable on the outer side of the outer buoy 14 can optionally be located below the sea surface.

[0054] Of course, the specific structure to be chosen can be determined based on the actual application, and no specific restrictions are imposed here.

[0055] See also Figure 2 In this application, the inner side of each outer buoy 14 near the central buoy 11 is connected to the shared ballast weight 23 below the central buoy via a second mooring cable 22.

[0056] It should be understood that a semi-submersible floating platform will generate six degrees of freedom motion under different sea conditions. When the semi-submersible floating platform (i.e., the floating body) moves, the shared ballast will move up and down and left and right, causing the second mooring cable connected to the shared ballast to be stretched and change length. As a result, the second mooring cable will generate a mooring system restoring force. This mooring system restoring force is opposite to the direction of the actual motion in the horizontal direction, thereby effectively suppressing the six degrees of freedom motion of the platform and increasing stability.

[0057] Optional, such as Figure 1-2 There can be three outer buoys, evenly distributed around the central buoy. Furthermore, the positions of the second mooring cables connecting the three outer buoys to the shared ballast load are evenly distributed, meaning that the three second mooring cables form three 120-degree angles with the center of the shared ballast load.

[0058] In summary, the semi-submersible floating platform provided in this application includes: a central buoy, a central connecting module surrounding the central buoy, multiple bypass beams extending radially outward along the central connecting module and fixedly connected to the central connecting module, and multiple peripheral buoys. The central connecting module is fixedly connected to the central buoy, and each peripheral buoy is fixedly connected to the end of the bypass beam furthest from the central connecting module. The outer side of each peripheral buoy furthest from the central buoy is anchored to the seabed via a first mooring cable, with different first mooring cables anchored at different positions on the seabed; the inner side of each peripheral buoy near the central buoy is connected to a shared ballast load below the central buoy via a second mooring cable. Thus, the multiple peripheral buoys of this application are anchored to different positions on the seabed via first mooring cables, achieving the use of multiple anchor bodies to resist the horizontal impact force of environmental loads and effectively suppressing the six degrees of freedom motion of the floating body. Meanwhile, multiple outer buoys are connected to a shared ballast load below the central buoy via a second mooring cable. When the buoy moves, the shared ballast load moves up and down and left and right, and the effective length of the second mooring cable changes accordingly, generating a mooring system restoring force, which further suppresses the six-degree-of-freedom motion of the buoy and improves the overall stability of the semi-submersible floating platform.

[0059] In one possible implementation, considering that both the central buoy 11 and the outer buoy 14 are quite large in practical applications, such as the outer buoy having a diameter of over 10 meters, if the outer buoy is designed as a solid structure, it may be impossible for the semi-submersible floating platform to maintain a floating state due to its large overall weight, meaning the semi-submersible floating platform might sink to the seabed.

[0060] To prevent the semi-submersible floating platform from sinking and becoming unusable, the outer pontoon 14 can optionally have a hollow structure at its center, which reduces its own weight and provides space for ballast water operations.

[0061] Similarly, the central pontoon can also be a hollow structure to achieve the same purpose.

[0062] Optionally, considering that some components or equipment are not used continuously during wind power generation but may be needed, such as for maintenance equipment, and given the time-consuming and labor-intensive nature of offshore transportation equipment, the center pontoon 11 can optionally be a structure with storage space to store components or equipment that the semi-submersible floating platform and wind turbine may use in the center pontoon for use when needed.

[0063] In some embodiments of this application, in order to make more reasonable use of the above-mentioned structure of the semi-submersible floating platform and enable the second mooring cable to play a better role, this application also provides the following optimized structure.

[0064] See Figure 3The diagram shown is a schematic diagram of the connection structure between a bypass beam and a second mooring cable provided in this application.

[0065] like Figure 3 The bypass beam 13 in this application may include two beams arranged in parallel with a gap between them, so that the second mooring cable 22 can pass through the gap between the two beams and connect to the shared ballast weight 23.

[0066] When the semi-submersible floating platform generates six degrees of freedom motion, the second mooring cable 22 may touch the beam of the bypass beam 13. This will not only cause wear to the second mooring cable 22, but also change the direction of the mooring system restoring force of the second mooring cable 22, causing the mooring system restoring force generated by the second mooring cable 22 to fail or reduce its effect of suppressing six degrees of freedom motion.

[0067] Optionally, this application may provide a grooved connector 131 connecting the two beams in the gap between them. Optionally, the grooved connector 131 may be located at the center of the two beams along their length. Thus, the second mooring cable 22 can be connected to the shared ballast load 23 via the groove of the grooved connector.

[0068] The groove of the groove connector can prevent the second mooring cable 22 from directly contacting the beam of the bypass beam 13, thus avoiding the failure of the restoring force of the mooring system to a certain extent.

[0069] Considering that although the second mooring cable 22 will not touch the bypass beam 13, it may still wear down due to contact with the grooved connector. To reduce the wear effect of the grooved connector on the second mooring cable, the grooved connector can optionally be a pulley.

[0070] like Figure 4 This is a schematic diagram of the structure of the bypass beam with a pulley installed, as provided in this application. The pulley 131 is rotatably mounted in the gap between the two beams, and the axis of rotation of the pulley is perpendicular to the length direction of the two beams.

[0071] In this embodiment, by setting a pulley 131 at the center of the bypass beam 13, the guidance and tension of the second mooring cable 22 connected to the shared ballast 23 can be changed. Guiding refers to changing the direction of force on the second mooring cable, allowing it to extend smoothly from the side of the platform to the shared ballast below, avoiding cable entanglement or friction with the platform structure. Tensioning refers to maintaining appropriate tension on the second mooring cable through the pulley's structural design (groove limiting and slightly adjustable angle), ensuring that the shared ballast can stably perform its function of "dynamically adjusting the center of gravity and suppressing platform movement," and preventing restoring force failure due to cable slack.

[0072] In other words, the free rotation of the pulley can adapt to the multi-directional movement of the semi-submersible floating platform, realizing the function of guidance and correction; at the same time, the groove limit can prevent the cable from falling off, and the presence of the pulley can also absorb the instantaneous tension peak, avoiding cable entanglement and friction or slack overload, and ensuring the effective transmission of the restoring force generated for the shared ballast weight.

[0073] In other embodiments of this application, considering that the independent construction, transportation and separate installation at sea of ​​shared ballast loads are time-consuming and labor-intensive, in order to simplify the construction process and reduce the cost of construction, transportation and installation, this application can make the bottom surface of the central buoy higher than the bottom surface of the outer buoys, and the height difference is greater than or equal to the height of the shared ballast load.

[0074] See Figure 5 The diagram shown is a structural schematic of the semi-submersible floating platform integrated with shared ballast loads provided in this application. Figure 5 By setting a structure with a height difference greater than or equal to the height of the shared ballast load, it is possible to build a semi-submersible floating platform without having to construct additional construction structures in the dock or construction site. It is only necessary to simply set the height difference between the bottom surfaces of the central buoy and the outer buoys, which reduces the difficulty of construction.

[0075] Simultaneously, this application allows for integrated towing by tightening the second mooring cable connecting the inner side of the semi-submersible floating platform to the shared ballast load during the towing process. Once the entire system is towed to the predetermined location (such as an offshore wind farm), the second mooring cable connecting the inner side of the shared ballast load is loosened to form a unified structure. Figure 6 The system is in place as shown, and then installation is carried out, which reduces offshore operation time and costs, improves installation efficiency, makes future maintenance work more convenient, and further improves the platform's operating efficiency.

[0076] This application also provides a floating wind turbine generator, see [link to relevant documentation] Figure 7 and Figure 8 , Figure 7 This is a structural schematic diagram of a floating wind turbine provided in this application. Figure 8 A front view of a floating wind turbine provided in this application.

[0077] like Figure 7 and Figure 8 The floating wind turbine provided in this application may include a wind turbine and a semi-submersible floating platform as described above. The wind turbine may include a wind turbine 31 and a tower 32 fixedly connected to the wind turbine. The end of the tower 32 away from the wind turbine 31 is fixedly connected to the central buoy 11 of the semi-submersible floating platform.

[0078] Considering that the wind turbine 31 may require maintenance, such as periodic maintenance, and for safety reasons, since the central float 11 is very high, the tower 32 can optionally be set as a hollow structure so that maintenance personnel can climb from inside the tower 32 to the location of the wind turbine for maintenance. For example, a ladder can be installed inside the tower 32 so that maintenance personnel can climb to the location of the wind turbine for maintenance.

[0079] Optionally, the tower and the central pontoon are fixedly connected by a flange.

[0080] Of course, the tower and the central pontoon can also be connected in other ways, and this application does not impose specific limitations.

[0081] The semi-submersible floating platform provided in this application significantly improves the platform's stability in harsh sea conditions by employing a semi-submersible structure and adjustable-height shared ballast loads. This design allows the platform to dynamically adjust its center of gravity according to changes in sea conditions, effectively reducing swaying caused by strong winds, large waves, and ocean currents, thereby minimizing the impact on the normal operation of floating wind turbines and improving power generation efficiency. Simultaneously, this structural design enhances the adaptability of the mooring system, enabling it to adapt to different seabed conditions and sea state changes, ensuring the platform can be reliably anchored to the seabed, reducing displacement, and improving the safety and reliability of the entire wind power system.

[0082] Meanwhile, by adopting hollow-structured pontoons and adjustable shared ballast loads, the amount of materials used is reduced, the manufacturing and installation process is simplified, construction costs are lowered, and transportation and installation expenses are also reduced.

[0083] In addition, by deploying buoys, cooperating mooring cables, and shared ballast around the platform, the platform can remain stable even in extreme sea conditions, reducing the risk of capsizing and ensuring the safety of personnel and equipment.

[0084] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0085] As illustrated in this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0086] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0087] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0089] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A semi-submersible floating platform, characterized in that, include: Center buoy; A central connecting module surrounds the central buoy, and the central connecting module is fixedly connected to the central buoy; Multiple bypass beams extending radially outward along the central connecting module and fixedly connected to the central connecting module; Multiple peripheral buoys, each of which is fixedly connected to the end of the bypass beam furthest from the central connecting module; The outer side of each peripheral buoy away from the central buoy is anchored to the seabed via a first mooring cable, with different first mooring cables anchored at different locations on the seabed; the inner side of each peripheral buoy near the central buoy is connected to a shared ballast load below the central buoy via a second mooring cable.

2. The semi-submersible floating platform according to claim 1, characterized in that, The outer pontoons are hollow structures, and the central pontoons are either hollow structures or structures with storage space.

3. The semi-submersible floating platform according to claim 1, characterized in that, The bypass beam comprises two parallel beams with a gap between them, through which the second mooring cable passes to connect to the shared ballast load.

4. The semi-submersible floating platform according to claim 3, characterized in that, The gap is provided with a grooved connector that connects the two beams, and the grooved connector is located at the center of the two beams along their own length. The second mooring cable is connected to the shared ballast weight via the groove of the groove connector.

5. The semi-submersible floating platform according to claim 4, characterized in that, The groove connector is a pulley, which is rotatably disposed in the gap between the two beams, and the axis of rotation of the pulley is perpendicular to its own length direction.

6. The semi-submersible floating platform according to any one of claims 1-4, characterized in that, The bottom surface of the central pontoon is higher than the bottom surface of the outer pontoons, and the height difference is greater than or equal to the height of the shared ballast load.

7. The semi-submersible floating platform according to claim 1, characterized in that, The number of the outer buoys is 3; the 3 outer buoys are evenly distributed around the central buoy, and the positions where the second mooring cables of the 3 outer buoys are connected to the shared ballast weight are evenly distributed.

8. A floating wind turbine generator, characterized in that, include: Wind turbine and the semi-submersible floating platform as described in any one of claims 1-7; The wind turbine unit includes a wind turbine and a tower fixedly connected to the wind turbine; The end of the tower furthest from the wind turbine is fixedly connected to the central pontoon of the semi-submersible floating platform.

9. The floating wind turbine generator according to claim 8, characterized in that, The tower has a hollow structure.

10. The floating wind turbine generator according to claim 8 or 9, characterized in that, The tower and the central pontoon are fixedly connected by a flange.

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