Expandable and pretension-adjustable steel cable floating type wind power platform and mounting method thereof

Abstract

The invention relates to the field of offshore wind power floating type wind power, in particular to an expandable pretension-adjustable steel cable floating type wind power platform and an installation method thereof.The platform comprises a tension steel cable floating type wind power platform, and the upper end of the tension steel cable floating type wind power platform is used for centrally installing a platform unit part; the tension steel cable system is connected with the tension steel cable floating type wind power platform and used for fixing the tension steel cable floating type wind power platform to the seabed and achieving platform tension adjustment and capacity expansion. The pretension can be adjusted, so that the function of automatically adjusting the tension of the tension steel cable floating type wind power platform is achieved; and the capacity expansion function of the platform supporting unit is achieved by adjusting the pretension.

Description

Technical Field

[0001] The present invention relates to the technical field of floating wind power technology for offshore wind power, and particularly relates to a steel cable floating wind power platform with expandable and adjustable pre-tension and an installation method thereof. Background Art

[0002] Offshore wind energy is clean, low-carbon, and has a large resource reserve, suitable for large-scale development, and is expected to become one of the future main power sources. It can effectively improve the energy structure while ensuring energy supply security. Currently, offshore wind power is still based on fixed types. However, with the gradual saturation of offshore resource development, the technical and economic feasibility of using fixed types in deep and far seas has been greatly reduced. Floating wind power has become the main type of deep and far sea wind power development. At present, the world's floating wind power technology is still in the pre-commercial development stage, mainly for performance verification and economic evaluation of various types of floating wind power platforms. From the perspective of economy and feasibility, the catenary mooring method is mostly used for semi-submersible platforms. However, for commercial development, if hundreds of floating wind turbines are arranged in the same wind farm and the catenary mooring is used, the entire sea area will be filled with mooring lines, which will intersect and interfere with each other, and it will also be difficult for subsequent wind farm maintenance. The tension cable type floating wind power platform will be more suitable for this scenario.

[0003] Traditional tension leg oil and gas platforms or floating wind power platforms are designed according to fixed pre-tension, resulting in that the variable load during the later operation of the platform cannot exceed the predetermined value. Although traditional tension leg oil and gas platforms or floating wind power platforms have great stiffness in the out-of-plane motion (heave, pitch, and roll) of the horizontal plane, their stiffness in the in-plane (surge, sway, and yaw) direction is very small, resulting in a large response amplitude in the corresponding direction. In addition, for traditional tension lock floating wind power platforms, the lower floating body is subjected to a huge vertical force from the mooring system. Combining with the hogging state of the floating body in waves, a huge resultant bending moment will be formed at the middle position of the lower floating body, affecting the overall strength.

[0004] The installation of the mooring system of the tension leg type floating wind power platform is a key link and also the link with the highest requirements for equipment, equipment, and accuracy in the whole construction. Due to the negative self-restoring moment problem of the tension leg type floating wind power platform during the installation stage, any mistake in the installation process will cause the whole platform to quickly capsize and there is almost no possibility of rescue.

[0005] Currently, the installation of tension legs is mainly achieved through two forms:

[0006] (1) Realized by the method of adding floating cylinders. The disadvantage of this method is that additional customized floating cylinders are required, and there are relatively large risks in the alignment installation, ballast discharge, and subsequent release operations of the floating cylinders.

[0007] (2) Specialized pushing machinery device. Since the pre-tension of the tension leg is very large, usually close to thousands of tons, this poses a high requirement for the pulling force of the pushing machinery. Currently, only a very small number of foreign specialized equipment can achieve this function, resulting in extremely high overall costs. Summary of the Invention

[0008] The purpose of the present invention is to provide a cable-supported floating wind power platform with expandable and adjustable pre-tension. Through the design of an adjustable pre-tension structure, the function of autonomously adjusting the tension of the cable-supported floating wind power platform can be realized. Aiming at the problem of traditional floating wind power platforms being sized according to a fixed unit power, the expandability function of supporting the platform unit can be achieved by adjusting the pre-tension.

[0009] Another purpose of the present invention is to provide an installation method for a cable-supported floating wind power platform with expandable and adjustable pre-tension. Through a dedicated tension amplification system and a cable quick connection and locking joint structure, the installation of the tension mooring system can be completed safely, reliably, and efficiently under low-cost conditions.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] A cable-supported floating wind power platform with expandable and adjustable pre-tension, comprising:

[0012] A cable-supported floating wind power platform, the upper end of which is used for centrally installing the platform unit part;

[0013] A cable system, connected to the cable-supported floating wind power platform, for fixing the cable-supported floating wind power platform to the seabed and realizing platform tension adjustment and expansion.

[0014] Thus, through the design of an adjustable pre-tension structure, the function of autonomously adjusting the tension of the cable-supported floating wind power platform can be realized. Aiming at the problem of traditional floating wind power platforms being sized according to a fixed unit power, the expandability function of supporting the platform unit can be achieved by adjusting the pre-tension.

[0015] Optionally, the cable-supported floating wind power platform includes a lower floating body connection structure, a ramp connection transition structure, a diagonal brace structure, a wind turbine tower support column structure, and a horizontal motion suppression structure. The lower floating body connection structure and the ramp connection transition structure are connected together to form an integral lower floating body structure. The horizontal motion suppression structure is embedded in the lower floating body connection structure. The integral lower floating body structure is connected to the wind turbine tower support column structure through the diagonal brace structure.

[0016] As described above, by means of the slope - connecting transition structure, it is possible to meet the strength requirements while saving steel structures. For the support column structure and the diagonal bracing structure of the wind turbine tower, the diameter of the support column structure of the wind turbine tower is directly processed and butt - welded according to the existing sheet widths in the market. This avoids the work of cutting sheets according to dimensions in the existing rolled - plate structure, greatly reducing the cutting and welding workload and improving work efficiency.

[0017] Furthermore, the tension - cable floating wind power platform has a triangular configuration with equal sides. A slope - connecting transition structure is provided at the middle position of each side. The height of the slope - connecting transition structure is 1.5 - 2 times the height of the lower - floating - body connection structure, and the slope angle is not greater than 45 degrees.

[0018] The lower - floating - body connection structure uses a fillet transition, and the fillet diameter is 4 times the width of the lower - floating - body connection structure.

[0019] As described above, through the planar motion suppression plate structure, the stiffness in the horizontal plane can be effectively increased, and the amplitude of the motion response in the horizontal plane can be reduced. The overall triangular configuration can also effectively increase the stiffness in the horizontal plane and reduce the amplitude of the motion response in the horizontal plane compared with other polygons.

[0020] Furthermore, the horizontal - plane motion suppression structure is arranged vertically in space, and the whole structure is integrated and is respectively vertically inserted into the fillet transition of the lower - floating - body connection structure.

[0021] As described above, it is possible to avoid the problem of occupying too much site during the early construction process. In addition, by using an integrated and universal structure, an opening groove can be pre - made in the lower - floating - body connection structure, and the horizontal - plane motion suppression structure can be directly inserted on - site later.

[0022] Furthermore, the support column structure of the wind turbine tower is located at the central position of the integral lower - floating - body structure.

[0023] As described above, it is used to ensure the uniform stress of the whole structure and the consistency of loading.

[0024] Furthermore, the diagonal bracing structure is vertically arranged with the integral lower - floating - body structure, and the diagonal bracing structure is connected to the slope - connecting transition structure.

[0025] As described above, the position of the diagonal bracing structure supports on the slope - connecting transition structure. The vertical angle between the diagonal bracing structure and the lower - floating - body not only reduces the diagonal bracing span but also successfully converts the wind turbine load into a favorable load for the structure, offsetting the moment actions of the pre - tension and the mid - arch, and realizing the structural conversion and utilization of the wind turbine load.

[0026] Optionally, the tension cable system includes a tension cable, an anchor foundation and a tension adjustment system, and each side of the tension cable floating wind power platform in a triangular configuration is provided with two sets of symmetrically arranged tension adjustment systems;

[0027] The tension adjustment system is used to achieve platform tension adjustment and expansion, and includes a guide chain structure, a tension amplifying connecting rope, a tension amplifying anchor windlass end, a tension amplifying stator end, and a tension amplifying mover end;

[0028] The lower end of the tension steel cable is installed on the anchor foundation. After the tension steel cable enters the platform from the seabed, it passes through the guide chain structure to control the direction of the steel cable; the upper end of the tension steel cable is connected to the tension amplifying mover end, and the tension amplifying stator end is connected to the tension amplifying mover end through the tension amplifying connecting rope, and the tension amplifying anchor machine end and the tension amplifying stator end are connected through the tail end of the tension amplifying connecting rope.

[0029] From the above, the present invention innovatively proposes a design concept and method of using a single-strand tension steel cable as a platform mooring system, which can effectively improve the breaking strength of the entire steel cable.

[0030] Furthermore, the chain guide structure, the tension amplifying anchor windlass end and the tension amplifying stator end are installed on the lower buoyancy body connection structure.

[0031] From above, the guide chain structure, the tension amplifying anchor machine end and the tension amplifying stator end are installed on the lower buoy connection structure, which is beneficial to the autonomous adjustment of the platform tension and the overall stability.

[0032] Preferably, it also includes a temporary buoy dragon whisker cable, a temporary buoy, a traction dragon whisker cable and a temporary floating ball, one end of the temporary buoy dragon whisker cable is hinged to the tension steel cable, and the other end of the temporary buoy dragon whisker is connected to the temporary buoy; one end of the traction dragon whisker cable is connected to the tension steel cable, and the other end is connected to the temporary floating ball.

[0033] From above, the use of temporary structures facilitates the installation of the tension cable platform.

[0034] A method for installing the aforementioned expandable and pre-tensioned steel cable floating wind power platform comprises the following steps:

[0035] Step 1: transport the tension cable to the site, install the end of the tension cable on the anchor foundation, connect the temporary buoy dragon beard cable and the traction dragon beard cable to the upper end of the tension cable, connect the temporary buoy dragon beard cable to the temporary buoy, so that the tension cable is vertical in the water, and connect the traction dragon beard cable to the temporary buoy to ensure that the entire traction dragon beard cable floats on the water;

[0036] Step 2: Pass the traction dragon beard cable through the guide chain structure, move the temporary buoy to the side of the tension cable floating wind power platform so that it bears the weight of the tension cable floating wind power platform itself, tighten the traction dragon beard cable until one end of one of the tension cables can be hung on the end of the tension amplification mover, and at the same time, release the connection between the temporary buoy dragon beard cable and the tension cable, remove the dragon beard cable, and connect the remaining tension cables in a similar way. At this time, the tension cable floating wind power platform is still in a free floating state, there is no tension in the tension cable, the tension amplification mover end is in the far end position, the draft of the tension cable floating wind power platform is below the lower floating body connection structure, and the stability of the entire tension cable floating wind power platform is still provided by the waterline;

[0037] Step 3: Start the tension-amplifying anchor windlass end. As the tension-amplifying anchor windlass end is gradually tightened, the tension-amplifying mover end will gradually move from the far end position to the tension-amplifying stator end. The tension is gradually applied to the tension cable through this process. As the tension is applied, the draft of the tension cable floating wind power platform will gradually increase until it is pulled to the specified draft position of the tension cable floating wind power platform. During the loading process, the six tension-amplifying anchor windlass ends operate synchronously to ensure that the tension cable floating wind power platform can sink smoothly. After reaching the specified draft, the entire stiffness will be transferred from the tension cable floating wind power platform to the tension cable, thus completing the installation of the platform.

[0038] From the above, in order to solve the installation problem of tension leg floating wind power platform, tension is used to provide platform rigidity to prevent the platform from tilting. Through the special tension amplification system and the steel cable quick connection and locking joint structure, the installation of the tension mooring system can be completed safely, reliably and efficiently under low cost conditions.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The tension can be adjusted autonomously, and the platform supports the function of unit expansion. 2. The in-plane movement of the tension cable platform is better suppressed. 3. The "slope lifting" structure is invented to meet the overall strength requirements while saving steel structure. 4. "Adaptive columns" make full use of the steel structure and reduce welding workload. 5. The diagonal brace structure is perpendicular to the lower floating structure, reducing the length of the diagonal brace. 6. The diagonal brace is supported on the slope lifting structure to convert the unfavorable load of the wind turbine into a favorable load of the structure. 7. The platform is installed in a tension manner, and the tensioning of the high pre-tension structure is achieved by inventing a large tension amplification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0042] Figure 2 is a front view structural schematic diagram of the present invention;

[0043] Figure 3 is a top view structural schematic diagram of the present invention;

[0044] Figure 4 is a side view of the tension cable tensioning system of the present invention;

[0045] Figure 5 is a top view of the tension cable tensioning system of the present invention;

[0046] Figure 6 is Installation State 1 of the present invention: the cable is pre-installed in a floating state;

[0047] Figure 7 is Installation State 2 of the present invention: the cable is connected to the platform in an initial state;

[0048] Figure 8 is Installation State 3 of the present invention: tightened to the specified tension state. Specific Embodiment

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0050] The expandable and adjustable pre-tensioned cable floating wind power platform of the present invention, as Figure 1 shown, includes a tension cable floating wind power platform 2 and a tension cable system 3. The platform unit part 1 is connected to the tension cable floating wind power platform 2 through an intermediate flange installed at the bottom of the platform unit part 1, and the tension cable floating wind power platform 2 is connected and fixed to the seabed through the tension cable system 3 to achieve the positioning of the entire platform.

[0051] As Figure 1 、 Figure 2 shown, the tension cable floating wind power platform 2 includes a lower floating body connection structure 202, a ramp connection transition structure 203, a diagonal brace structure 204, a wind turbine tower support column structure 205, and a horizontal motion suppression structure 206. Among them, the lower floating body connection structure 202 and the ramp connection transition structure 203 are rigidly welded together to form an integral lower floating body structure. The horizontal motion suppression structure 206 is rigidly embedded in the lower floating body connection structure 202 through an insertion plate, and the wind turbine tower support column structure 205 is connected to the integral lower floating body structure through the diagonal brace structure 204.

[0052] Preferably, asFigure 3 As shown in the figure, the tension cable floating wind power platform 2 is in a triangular configuration with equal sides. At the middle position of each side, considering the tension at both ends in the order of thousands of tons and the hogging effect of waves, there is a large bending moment at the middle position of the side. Therefore, a ramp connection transition structure 203 is provided at the middle of the side. The height of the ramp connection transition structure 203 is 1.5 - 2 times the height of the lower floating body connection structure 202, and the slope angle is not more than 45 degrees. The three ramp connection transition structures 203 are connected into a whole through the lower floating body connection structure 202. For the lower floating body connection structure 202, considering the high stress concentration problem at the straight edge, a fillet transition is adopted for the edge transition, and the fillet diameter is 4 times the width of the lower floating body connection structure 202. This ensures the consistency and coordination of the overall structural space configuration. The transition structure is generally relatively flat to save structural materials as much as possible on the basis of meeting the weight of the steel structure and increase economy. The overall triangular configuration can also effectively increase the stiffness in the horizontal plane and reduce the amplitude of the motion response in the horizontal plane compared with other polygons.

[0053] To further increase the stiffness in the horizontal plane, as Figure 3 shown, a horizontal plane motion suppression structure 206 is provided outside the lower floating body connection structure 202. Preferably, the horizontal plane motion suppression structure 206 is integrated and arranged in a vertical space, such as being vertically inserted into the fillet transition of the lower floating body connection structure 202 respectively. More specifically, an opening groove can be pre-made in the lower floating body connection structure 202 and the horizontal plane motion suppression structure 206 can be directly inserted on site later. In addition, this structure can be inserted at multiple positions according to needs to increase its stiffness in the horizontal plane.

[0054] As Figure 1 shown, the wind turbine tower support column structure 205 is located at the central position of the integral lower floating body structure to ensure the uniform stress of the whole structure and the consistency of the loading. The wind turbine tower support column structure 205 can also be called an "adaptive column", which is mainly reflected in that: the diameter of the column is directly processed and butt-welded according to the existing sheet widths in the market, which avoids the work of cutting sheets according to dimensions for the existing rolled plate structure, greatly reduces the cutting and welding workload, and improves work efficiency; in addition, for the column structure, no stiffening plate structure is provided inside, and a super-thick plate structure is used for one-time forming and welding. This avoids the residual stress problem and fatigue problem caused by a large amount of welding.

[0055] As Figure 1 、 Figure 3As shown, for the diagonal bracing structure 204, the core function of this structure is to connect the support columns 205 of the wind turbine tower barrel with the integral lower floating body structure as a whole, and transfer the wind turbine load to the structure. The innovation point of the diagonal bracing design is: using a vertical diagonal bracing structure 204 to achieve the connection with the integral lower floating body structure. That is, the side of the diagonal bracing structure 204 is perpendicular to the integral lower floating body structure. It can ensure that the length of the diagonal bracing structure 204 is the minimum, which can not only effectively reduce the use of materials, but also greatly improve the buckling resistance of the structure (the buckling resistance is inversely proportional to the square of the structure length). More specifically, the diagonal bracing structure 204 is connected to the slope connection transition structure 203. One advantage of this design is to convert the wind turbine load into a favorable load for structural strength. This is because in high sea states, the most dangerous working condition is the maximum bending moment in the middle caused by the combination of pre-tension and mid-arch. After the diagonal bracing structure 204 is supported on the slope connection transition structure 203, the wind turbine load is a vertically downward force, which can effectively reduce the bending moment caused by the most dangerous working condition. It has a significant improvement effect on the overall structural strength design concept.

[0056] As Figure 2 、 Figure 4 shown, the tension cable system 3 includes tension cables 301, an anchoring foundation 302, and a tension adjustment system. The tension adjustment system is used to achieve platform tension adjustment and expansion, and includes a chain block structure 305, a tension amplification connecting rope 306, a tension amplification anchor machine end 307, a tension amplification stator end 308, and a tension amplification rotor end 309.

[0057] Preferably, as Figure 5 shown, two sets of symmetrically arranged tension adjustment systems are provided on each side of the triangular-configured tension cable floating wind power platform 2. Among them, the lower end of the tension cable 301 is fixed to the anchoring foundation 302 through a conventional connection joint. After the tension cable 301 enters the platform from the seabed, it passes through the chain block structure 305 to control the cable direction; the upper end of the tension cable 301 is connected to the hanging rope end of the tension amplification rotor end 309. The tension amplification stator end 308 is connected to the tension amplification rotor end 309 through the tension amplification connecting rope 306, and the tension amplification anchor machine end 307 and the tension amplification stator end 308 are connected through the tail end of the tension amplification connecting rope 306. The chain block structure 305, the tension amplification anchor machine end 307, and the tension amplification stator end 308 are fixed to the lower floating body connection structure 202 through a base.

[0058] As Figure 6As shown in the figure, for the installation of the tensioned cable platform, temporary structures are required, including temporary buoy guy ropes 401, temporary buoys 402, towing guy ropes 403, and temporary floats 404. One end of the temporary buoy guy rope 401 is hinged to the tensioned cable 301, and the other end of the temporary buoy guy rope 401 is connected to the temporary buoy 402; one end of the towing guy rope 403 is connected to the tensioned cable 301, and the other end is connected to the temporary float 404.

[0059] Different from the traditional tension leg platform that uses special and expensive tendon mooring structures, the present invention proposes a design concept and method of using a tensioned cable 301 as the platform mooring system. The tensioned cable 301 adopts a single-strand cable structure, which can effectively improve the breaking strength of the entire cable. In addition, a sheath structure is provided on the outer side of the tensioned cable structure 301 to effectively avoid seawater corrosion.

[0060] The tension amplification winch end 307 is a multi-pulley structure. Preferably, it can be set to 10 groups of pulleys. The hundred-ton load at the tension amplification winch end 307 is amplified through a pulley group amplifier to achieve the thousand-ton level load required for the tensioned cable. When the tension needs to be adjusted, the tension amplification winch end 307 is tightened, pulling the entire tension towards the center of the platform, and the tensioned cable becomes larger. Similarly, when the tension amplification winch end 307 is relaxed, the tensioned cable 301 becomes smaller. Specifically, when tightening is required, the tension amplification winch end 307 is started. The tension amplification stator end 308 also starts to rotate with the start of the tension amplification winch end 307, driving the tension amplification connecting rope 306 to start tightening. As the tension amplification connecting rope 306 tightens, the tension amplification rotor end 309 gradually tightens to the tension amplification stator end 308, and the tensioned cable 301 also tightens together with the tension amplification rotor end 309, thereby achieving the purpose of tension tightening. The relaxation process is similar to the tightening process, but the actions are opposite. According to the principle of the pulley group structure, for every L length tightened by the tension amplification winch end 307, the tension amplification rotor end 309 achieves a tightening of L / 10 length, but the force can be amplified by 10 times (illustrated with 10 groups of pulleys as an example). In this way, during the operation of the entire platform, according to needs, when expanding capacity, the tension can be appropriately reduced to meet the installation of larger megawatt wind turbines. Similarly, if it is necessary to improve the power generation efficiency and control the movement of the platform, the tension can be increased to achieve the control of the platform and improve the power generation efficiency.

[0061] An installation method for the aforementioned expandable and adjustable pre-tensioned cable floating wind power platform is described in detail as follows:

[0062] As Figure 6As shown, in installation state 1, the platform has not arrived at the site. First, the tension cable 301 is transported to the site by an engineering ship, and the end of the tension cable 301 is installed on the anchor foundation 302 by the installation ship and the underwater ROV (remotely operated unmanned submersible). The upper end of the tension cable 301 is connected to the temporary buoy dragon beard cable 401 and the traction dragon beard cable 403, wherein the temporary buoy dragon beard cable 401 is mainly responsible for connecting the tension cable 301 to the temporary buoy 402 to achieve the verticality of the tension cable 301 in the water; the temporary buoy dragon beard cable 401 and the traction dragon beard cable 403 need to bear the wet weight of the entire tension cable 301. The traction dragon beard cable 403 only needs to be connected to the temporary buoy 404 to ensure that the entire traction dragon beard cable 403 floats on the water.

[0063] like Figure 7 As shown, from installation state 1 to installation state 2, first pass the traction dragon beard cable 403 through the guide chain structure 305, move the temporary buoy 402 to the side of the tension cable floating wind power platform 2, so that it bears the weight of the tension cable floating wind power platform 2 itself, and tighten the traction dragon beard cable 403 until one end of one of the tension cables 301 can be hung on the tension amplification mover end 309. At the same time, release the connection between the temporary buoy dragon beard cable 401 and the tension cable 301, and remove the dragon beard cable 403. Connect the remaining tension cables 301 in a similar way. At this time, the tension cable floating wind power platform 2 is still in a free floating state. There is no tension in the tension cable 301, and the tension amplification mover end 309 is in the far end position. The draft of the tension cable floating wind power platform 2 is located below the lower floating body connection structure, and the stability of the entire system is still provided by the waterline.

[0064] like Figure 8 As shown, from state 2 to state 3, the tension amplifying anchor machine end 307 is started, and as the tension amplifying anchor machine end 307 is gradually tightened, the tension amplifying mover end 309 will gradually approach the tension amplifying stator end 308 from the far end. The tension is gradually applied to the tension cable 301 through this process. As the tension is applied, the draft of the tension cable floating wind power platform 2 will gradually increase until it is pulled to the specified draft position of the tension cable floating wind power platform 2. During the loading process, the six tension amplifying anchor machine ends 307 operate synchronously to ensure that the tension cable floating wind power platform 2 can sink smoothly. After reaching the specified draft, the entire stiffness will be transferred from the tension cable floating wind power platform 2 to the tension cable 301, and the stability of the tension cable floating wind power platform 2 needs to rely on the stiffness provided by the tension cable 301. The installation of the platform is now completed.

[0065] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope of the claims.

Claims

1. A cable floating wind power platform with expandable capacity and adjustable pre-tension, characterized in that: include: The upper end of the tension cable floating wind power platform is used to install the platform unit part in the center; The tension cable system is connected to the tension cable floating wind power platform and is used to fix the tension cable floating wind power platform on the seabed and realize platform tension adjustment and capacity expansion.

2. The expandable and pre-tensioned steel cable floating wind power platform according to claim 1 is characterized in that: The tension cable floating wind power platform includes a lower floating body connection structure, a slope-lift connection transition structure, a diagonal brace structure, a wind turbine tower support column structure and a horizontal plane movement suppression structure. The lower floating body connection structure and the slope-lift connection transition structure are connected together to form an integral lower floating body structure. The horizontal plane movement suppression structure is embedded in the lower floating body connection structure. The integral lower floating body structure is connected to the wind turbine tower support column structure through the diagonal brace structure.

3. The expandable and pre-tensioned steel cable floating wind power platform according to claim 1 is characterized in that: The tension cable floating wind power platform is triangular in configuration, with equal sides; a slope-lifting connection transition structure is arranged in the middle of each side, the height of the slope-lifting connection transition structure is 1.5-2 times the height of the lower floating body connection structure, and the slope angle is not more than 45 degrees; The lower floating body connection structure adopts a rounded corner transition, and the rounded corner diameter is 4 times the width of the lower floating body connection structure.

4. The expandable and pre-tensioned steel cable floating wind power platform according to claim 2 is characterized in that: The horizontal plane motion suppression structure is arranged in a vertical space, and the entire structure is integrated and vertically inserted into the rounded corner transition of the lower floating body connection structure.

5. The expandable and pre-tensioned steel cable floating wind power platform according to claim 2 is characterized in that: The wind turbine tower support column structure is located at the center of the integral lower floating body structure.

6. The expandable and pre-tensioned steel cable floating wind power platform according to claim 2 is characterized in that: The oblique support structure and the integral lower floating body structure are arranged vertically, and the oblique support structure is connected with the slope lifting connection transition structure.

7. The expandable and pre-tensioned steel cable floating wind power platform according to claim 1 is characterized in that: The tension cable system includes a tension cable, an anchor foundation and a tension adjustment system. Each side of the tension cable floating wind power platform in a triangular configuration is provided with two sets of symmetrically arranged tension adjustment systems; The tension adjustment system is used to achieve platform tension adjustment and expansion, and includes a guide chain structure, a tension amplifying connecting rope, a tension amplifying anchor windlass end, a tension amplifying stator end, and a tension amplifying mover end; The lower end of the tension steel cable is installed on the anchor foundation. After the tension steel cable enters the platform from the seabed, it passes through the guide chain structure to control the direction of the steel cable; the upper end of the tension steel cable is connected to the tension amplifying mover end, and the tension amplifying stator end is connected to the tension amplifying mover end through the tension amplifying connecting rope, and the tension amplifying anchor machine end and the tension amplifying stator end are connected through the tail end of the tension amplifying connecting rope.

8. The expandable and pre-tension adjustable steel cable floating wind power platform according to claim 7 is characterized in that: The chain guide structure, the tension amplifying anchor windlass end and the tension amplifying stator end are installed on the lower floating body connection structure.

9. The expandable and pre-tension adjustable steel cable floating wind power platform according to claim 7, characterized in that: It also includes a temporary buoy dragon whisker cable, a temporary buoy, a traction dragon whisker cable and a temporary floating ball. One end of the temporary buoy dragon whisker cable is hinged to the tension steel cable, and the other end of the temporary buoy dragon whisker is connected to the temporary buoy; one end of the traction dragon whisker cable is connected to the tension steel cable, and the other end is connected to the temporary floating ball.

10. A method for installing a cable floating wind power platform with expandable capacity and adjustable pre-tension as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: transport the tension cable to the site, install the end of the tension cable on the anchor foundation, connect the temporary buoy dragon beard cable and the traction dragon beard cable to the upper end of the tension cable, connect the temporary buoy dragon beard cable to the temporary buoy, so that the tension cable is vertical in the water, and connect the traction dragon beard cable to the temporary buoy to ensure that the entire traction dragon beard cable floats on the water; Step 2: Pass the traction dragon beard cable through the guide chain structure, move the temporary buoy to the side of the tension cable floating wind power platform so that it bears the weight of the tension cable floating wind power platform itself, tighten the traction dragon beard cable until one end of one of the tension cables can be hung on the end of the tension amplification mover, and at the same time, release the connection between the temporary buoy dragon beard cable and the tension cable, remove the dragon beard cable, and connect the remaining tension cables in a similar way. At this time, the tension cable floating wind power platform is still in a free floating state, there is no tension in the tension cable, the tension amplification mover end is in the far end position, the draft of the tension cable floating wind power platform is below the lower floating body connection structure, and the stability of the entire tension cable floating wind power platform is still provided by the waterline; Step 3: Start the tension-amplifying anchor windlass end. As the tension-amplifying anchor windlass end is gradually tightened, the tension-amplifying mover end will gradually move from the far end position to the tension-amplifying stator end. The tension is gradually applied to the tension cable through this process. As the tension is applied, the draft of the tension cable floating wind power platform will gradually increase until it is pulled to the specified draft position of the tension cable floating wind power platform. During the loading process, the six tension-amplifying anchor windlass ends operate synchronously to ensure that the tension cable floating wind power platform can sink smoothly. After reaching the specified draft, the entire stiffness will be transferred from the tension cable floating wind power platform to the tension cable, thus completing the installation of the platform.

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