Suspended ballast type floating offshore wind power foundation adapting to water depth and using method

Abstract

The invention discloses a suspended ballast floating type offshore wind power foundation suitable for water depth and a using method, and belongs to the technical field of floating type offshore wind power generation. The wind power foundation comprises a three-stand-column semi-submersible foundation, a mooring system and a control system, and the three-stand-column semi-submersible foundation comprises three vertical stand columns, a supporting rod and a ballast caisson; the ballast caisson is connected with a sliding rail arranged on the side wall of the vertical stand column through a sliding rope, so that the ballast caisson moves up and down relative to the vertical stand column, the position of the ballast caisson is adjusted through a control system, and then the gravity center position and the draft depth of the foundation are adjusted so as to adapt to different environmental conditions, and the stability and the anti-overturning capacity are ensured. The use method comprises the steps of monitoring environmental conditions, calculating overturning moment, calculating anti-overturning moment, adjusting the depth of the ballast caisson and recording and analyzing data, the required moving depth of the ballast caisson is reversely deduced by calculating the overturning moment to ensure that the gravity center and the buoyancy center of the foundation are kept at proper positions, and the risk of overturning of the foundation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of floating offshore wind power generation, and in particular to a water depth-adaptable suspended ballast floating offshore wind power foundation and a use method thereof. Background Art

[0002] In recent years, with the advancement of science and technology at home and abroad, wind power generation has a tendency to develop towards the deep sea. In deep sea areas, floating offshore wind power foundations have received widespread attention. There are three main common types: Spar column type, TLP tension leg type and semi-submersible type.

[0003] The Spar column type has a simple design and manufacturing process with few moving parts, but is difficult to construct and install. In order to meet stability requirements, the overall weight of the Spar column foundation is large and the draft is large, which limits the feasibility of returning it to the dock for maintenance.

[0004] The TLP tension leg type uses less steel and has fewer moving parts. It can be installed and debugged on land, thus avoiding various difficulties in offshore installation. However, the TLP tension leg type foundation balances the excess buoyancy of the floating body upward through the vertical mooring tension, which makes the mooring and anchoring system extremely stressed and risky. The natural frequency of the TLP tension leg type foundation is prone to resonate with the frequency of the waves, causing structural fatigue and damage. Although the TLP tension leg type foundation can be installed and debugged on land, its offshore installation process is still complicated and requires precise tension control and anchoring systems. The installation process is very challenging, the technology is relatively immature, and a professional customized installation vessel is required.

[0005] In contrast, semi-submersible offshore wind power foundations have significant advantages in terms of stability and technical maturity. Semi-submersible floating wind turbine foundations are stable, flexible and reliable in operation. They are suitable for a wide range of water depths, have a small draft, a large waterline, are movable and reusable, and are easy to install. After being debugged near the shore, they can be towed to the wind farm and positioned using anchor chains. They are one of the most promising foundations for offshore wind energy development in the future. However, semi-submersible offshore wind power foundations rely on their buoyancy to maintain stability. As the water depth increases, the buoyancy and stability of the foundation may be affected, especially in extreme weather conditions, where the effects of waves and wind may cause the foundation to float and tilt. The design of semi-submersible foundations is usually designed for specific working environment conditions, so their adaptability may be limited in different water depths or extreme environments.

[0006] Therefore, developing a semi-submersible offshore wind power foundation and usage method that can effectively adapt to different water depths or environments and has good stability is a difficult problem in the current development of marine power generation technology. Summary of the invention

[0007] In view of the deficiencies mentioned in the above technical background, the object of the present invention is to provide a deep-water suspended ballast floating offshore wind power foundation and a method of use.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A suspended ballast floating offshore wind power foundation adaptable to water depth, comprising a three-column semi-submerged foundation for supporting a wind turbine, a mooring system and a control system for automatic control of the wind power foundation, wherein the three-column semi-submerged foundation comprises three vertical columns, a strut and a ballast caisson, wherein the three vertical columns are equally spaced to form an equilateral triangle, the two ends of the strut are respectively connected to the adjacent vertical columns, the ballast caisson is arranged at the midpoint of the equilateral triangle, and is connected to a slide rail arranged on the side wall of the vertical column through a slide cable, the control system controls the slide cable to slide up and down relative to the slide rail, so that the ballast caisson moves up and down relative to the vertical column; the mooring system comprises a mooring cable and a mooring anchor corresponding to the vertical columns one by one, one end of the mooring cable is fixedly installed at the bottom of the vertical column, and the other end is connected to the mooring anchor, and the mooring anchor is anchored to the seabed.

[0010] As a preferred technical solution of the present invention, a heave plate with adaptive telescopic width is provided at the bottom of the ballast caisson.

[0011] As a preferred technical solution of the present invention, the ballast caisson adopts a concrete cylindrical structure. The control system controls the moving distance of the slide cable on the slide rail, thereby controlling the moving distance of the ballast caisson relative to the vertical column, thereby completing the center of gravity adjustment of the three-column semi-submerged foundation.

[0012] As a preferred technical solution of the present invention, the ballast caisson adopts a hydraulic cabin structure. The hydraulic cabin injects or discharges seawater into or out of the interior of the hydraulic cabin through a hydraulic pump electrically connected to the control system to change the weight and buoyancy of the hydraulic cabin and complete the up and down movement of the ballast caisson relative to the vertical column. Pressure sensors are provided on the inner and outer walls of the hydraulic cabin, which are respectively used to monitor the depth of seawater and the changes in water pressure in the hydraulic cabin in real time.

[0013] As a preferred technical solution of the present invention, the mooring cable adopts a catenary steel anchor chain, and the mooring anchor adopts a suction cylinder anchor or a caisson anchor.

[0014] As a preferred technical solution of the present invention, the support rods include horizontal support rods and diagonal support rods, the top end of each vertical column is connected to the top end of the adjacent vertical column through the horizontal support rod, the bottom end of each vertical column is connected to the bottom end of the adjacent vertical column through the horizontal support rod, and the bottom end of each vertical column is connected to the top end of the adjacent vertical column through the diagonal support rod.

[0015] As a preferred technical solution of the present invention, the control system includes a monitoring subsystem and a control subsystem. The monitoring subsystem monitors the wind speed and wind direction information in real time through an ultrasonic wind speed and wind direction sensor arranged on the three-column semi-submersible foundation, and feeds back the information to the control system. The control system analyzes the wind speed and wind direction information and issues a dynamic control command to the control subsystem. The control subsystem adjusts the distance between the ballast caisson and the vertical column according to the command.

[0016] A method for using a suspended ballast floating offshore wind power foundation that is adaptable to water depth according to the present invention is used for the suspended ballast floating offshore wind power foundation that is adaptable to water depth. The method for using the suspended ballast floating offshore wind power foundation comprises the following steps:

[0017] S1 Monitoring environmental conditions: using ultrasonic wind speed and wind direction sensors to monitor the wind speed and wind direction around the wind power foundation in real time, and transmitting the monitoring data to the control system;

[0018] S2 Calculate the overturning moment: The control system calculates the wind force on the wind power foundation according to the monitoring data, and calculates the overturning moment M generated by the wind force based on the wind force action point and the center of gravity position of the wind power foundation. t , satisfying the following relationship:

[0019]

[0020] M t =F w ·d

[0021] In the formula, F w is the wind force, ρ is the air density, A is the wind action area, that is, the projected area of ​​the fan blades, C d is the wind resistance coefficient, V is the wind speed, and d is the horizontal distance from the wind action point to the center of gravity of the wind turbine foundation;

[0022] S3 Calculate the anti-overturning moment: Calculate the anti-overturning moment M according to the gravity of the wind power foundation and the submerged depth of the ballast caisson a , satisfying the following relationship:

[0023] M a =μ·W·h

[0024] Wherein, W is the gravity of the wind turbine foundation, h is the vertical distance from the center of gravity of the wind turbine foundation to its bottom, and μ is the safety factor, which is less than 1.0;

[0025] S4 adjusts the depth of the ballast caisson: The control system analyzes and determines whether the wind power foundation is safe according to the calculation results of steps S2 and S3. t ≥M a When it is judged to be unsafe, the control system adjusts the depth of the ballast caisson through the slide rope and the slide rail until M t <M a , wherein the adjusted depth h' of the ballast caisson satisfies the following relationship:

[0026] h'=h+d box

[0027] M a ′=μ·W·h′

[0028] M a ′>M t

[0029] Where, d box The additional depth required for the ballast caisson, M a ' is the anti-overturning moment of the wind power foundation after the ballast caisson is adjusted to a depth h';

[0030] S5 Data Recording and Analysis: All monitoring data, calculation results and adjustment records are archived for subsequent analysis and optimization of the design and operation of the wind power foundation. Through data analysis, potential risk factors can be identified and provide reference for future wind power projects.

[0031] As a preferred technical solution of the present invention, the overturning moment in step S2 also includes the overturning moment generated by the wave load, which satisfies the following relationship:

[0032] M s =M t +M w

[0033] M w =ρ'·g·H·A'·d'

[0034] Where M s is the total overturning moment on the wind turbine foundation, M w is the overturning moment generated by wave load, ρ' is the seawater density, A' is the wave action area, H is the wave height, and d' is the horizontal distance from the wave load action point to the center of gravity of the wind turbine foundation.

[0035] As a preferred technical solution of the present invention, the safety factor μ is 0.6.

[0036] In summary, the beneficial effects of the present invention are:

[0037] The present invention arranges a ballast caisson whose depth can be adjusted according to real-time marine environmental conditions in the wind power foundation, so that the wind power foundation can maintain optimal stability and anti-overturning ability under various conditions. The waves, tides and wind forces in deep sea areas vary greatly. Under different water depths and environmental conditions, the loads and dynamic responses of the wind power foundation will be different. By adjusting the depth of the ballast caisson, the buoyancy and stability of the wind power foundation are improved, and it can adapt to a wider range of water depth changes, especially in environments with large fluctuations or strong winds, avoiding the inadaptability caused by fixed structures, reducing the vibration amplitude of the foundation structure under the action of waves and wind, thereby reducing fatigue damage to the structure. At the same time, this dynamic adjustment mechanism not only improves the adaptability and safety of the wind power foundation, but also reduces excessive conservatism during design and construction, and avoids overly complex structural design. For example, in shallower waters, an overly large ballast caisson is not required; in deeper waters, the stability can be increased by increasing the depth of the caisson, thereby rationally allocating resources according to actual needs and saving construction costs.

[0038] By calculating the overturning moment, it is possible to ensure that the center of gravity and center of buoyancy of the wind turbine foundation remain in the appropriate position, effectively predict whether the wind turbine foundation will overturn due to external waves, wind or other factors, take measures in advance to adjust the sinking depth, reduce the risk of overturning of the wind turbine foundation, and ensure that the wind turbine foundation can operate safely under various environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of a three-column semi-submerged foundation of the present invention;

[0040] Figure 2 It is a schematic diagram of a suspended ballast floating offshore wind power foundation that is adaptable to water depth according to the present invention;

[0041] Figure 3 It is a flow chart of a method for using a suspended ballast floating offshore wind power foundation that is adaptable to water depth according to the present invention;

[0042] Among them: 1-three-column semi-submerged foundation, 11-vertical column, 12-strut, 13-ballast caisson, 14-slip rope, 15-slide rail, 2-mooring system, 21-mooring cable, 22-mooring anchor. DETAILED DESCRIPTION

[0043] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0044] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also have other implementations and variations thereof. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] like Figures 1 to 2 As shown, the present invention is a suspended ballast floating offshore wind power foundation adaptable to water depth, including a three-column semi-submerged foundation 1 for supporting a wind turbine, a mooring system 2 and a control system for automatic control of the wind power foundation (not shown in the figure), the three-column semi-submerged foundation 1 includes three vertical columns 11, a strut 12 and a ballast caisson 13, the three vertical columns 11 are equally spaced to form an equilateral triangle, the two ends of the strut 12 are respectively connected to the adjacent vertical columns 11, the ballast caisson 13 is arranged at the midpoint of the equilateral triangle, and is connected to a slide rail 15 arranged on the side wall of the vertical column 11 through a slide cable 14, the control system controls the slide cable 14 to slide up and down relative to the slide rail 15, so that the ballast caisson 13 moves up and down relative to the vertical column 11; the mooring system 2 includes a mooring cable 21 and a mooring anchor 22 corresponding to the vertical column 11, one end of the mooring cable 21 is fixedly installed at the bottom of the vertical column 11, and the other end is connected to the mooring anchor 22, and the mooring anchor 22 is anchored to the seabed.

[0046] By adjusting the up and down movement of the ballast caisson 13 relative to the vertical column 11 through the control system, the center of gravity position and draft of the foundation can be effectively adjusted, and the stability of the foundation can be adjusted in real time according to different environmental conditions, such as waves, wind speed, tidal changes, etc., to ensure that the wind power foundation can maintain the best stability and anti-overturning ability under various conditions. Especially in deep water and dynamic environments, the up and down adjustment of the ballast caisson 13 can optimize the buoyancy and stability of the wind power foundation, avoid the instability of the structure caused by too much or too little buoyancy, and reduce the risk of damage in extreme weather or severe sea conditions. Secondly, by adjusting the depth of the ballast caisson 13 up and down, not only can the stability of the wind power foundation be adjusted, but also the stress of the mooring system 2 can be optimized. The mooring cable 21 and the anchoring system are the key to ensuring the stability of the floating foundation. By controlling the position of the ballast caisson 13, the mechanical state of the mooring system 2 can be optimized under different sea conditions, so that the stress of the mooring cable 21 is more uniform, and the mooring system 2 is avoided from being overloaded or unstable, thereby improving the reliability of the entire system.

[0047] As a preferred embodiment of the present invention, a heave plate with adaptive telescopic width is provided at the bottom of the ballast caisson 13 .

[0048] The adaptive telescopic width function of the heave plate can be automatically adjusted according to the changes in waves to provide appropriate hydrodynamic damping, which helps to offset the aerodynamic thrust generated by the wind turbine, enhance the ability of the wind power foundation to resist unstable airflow in deep sea areas, effectively reduce the impact of ocean currents on the ballast caisson 13, and reduce the amplitude of the longitudinal and heave motions of the platform, so that the ballast caisson 13 can be maintained in a more stable dynamic equilibrium state, thereby reducing the swaying and uneven stress of the wind power foundation, and improving the performance and stability of the wind power foundation in complex marine environments.

[0049] As a preferred embodiment of the present invention, the ballast caisson 13 adopts a concrete cylindrical structure. The control system controls the moving distance of the slide cable 14 on the slide rail 15, thereby controlling the moving distance of the ballast caisson 13 relative to the vertical column 11, thereby completing the center of gravity adjustment of the three-column semi-submerged foundation 1.

[0050] The concrete cylindrical structure maintains stability through the balance of its own weight and the buoyancy of water. The concrete material has good compressive strength and durability, can withstand greater external pressure and environmental influences, and is suitable for use in harsh environments such as the ocean. In addition, its own weight is large, and the concrete cylindrical structure has strong anti-buoyancy ability in water, which can effectively maintain the stability of the caisson. The control system drives the moving distance of the zip line 14 on the slide rail 15, thereby driving the ballasted caisson 13 to move up and down. The working mechanism and structural design are simple, reducing complex mechanical components, with a low failure rate and relatively few maintenance and repair requirements, thereby reducing the cost of long-term operation. It can operate stably under different environmental conditions, has strong adaptability, and is suitable for a variety of application scenarios.

[0051] As a preferred embodiment of the present invention, the ballast caisson 13 adopts a hydraulic cabin structure. The hydraulic cabin injects or discharges seawater into or out of the interior of the hydraulic cabin through a hydraulic pump electrically connected to the control system to change the weight and buoyancy of the hydraulic cabin, thereby completing the up and down movement of the ballast caisson 13 relative to the vertical column 11. Pressure sensors are provided on the inner and outer walls of the hydraulic cabin, which are respectively used to monitor the depth of seawater and the changes in water pressure in the hydraulic cabin in real time.

[0052] The ballast caisson 13 changes its buoyancy by adjusting the liquid in the hydraulic chamber, and adjusts the weight of the ballast caisson 13 to control its depth in the water. When the ballast caisson 13 needs to be sunk to a deeper depth to provide higher stability, the water volume in the hydraulic chamber is increased to deepen the submerged depth of the ballast caisson 13, so that the wind power platform always maintains an ideal stable state. Through the control of the hydraulic pump, the position of the ballast caisson 13 can be accurately controlled, which is suitable for application scenarios that require high-precision positioning, and can complete position adjustment in a short time, which is suitable for applications in dynamic environments.

[0053] As a preferred embodiment of the present invention, the mooring cable 21 adopts a catenary steel anchor chain, and the mooring anchor 22 adopts a suction cylinder anchor or a caisson anchor.

[0054] As a preferred embodiment of the present invention, the support rods 12 include horizontal support rods and diagonal support rods. The top end of each vertical column 11 is connected to the top end of the adjacent vertical column 11 through a horizontal support rod, the bottom end of each vertical column 11 is connected to the bottom end of the adjacent vertical column 11 through a horizontal support rod, and the bottom end of each vertical column 11 is connected to the top end of the adjacent vertical column 11 through a diagonal support rod.

[0055] As a preferred embodiment of the present invention, the control system includes a monitoring subsystem and a control subsystem. The monitoring subsystem monitors the wind speed and wind direction information in real time through an ultrasonic wind speed and wind direction sensor arranged on the three-column semi-submerged foundation 1, and feeds back the information to the control system. The control system analyzes the wind speed and wind direction information and issues dynamic control commands to the control subsystem. The control subsystem adjusts the distance between the ballast caisson 13 and the vertical column 11 according to the command.

[0056] like Figure 3 As shown, a method for using a suspended ballast floating offshore wind power foundation that is adaptable to water depth according to the present invention is used for a suspended ballast floating offshore wind power foundation that is adaptable to water depth, and the method for using the suspended ballast floating offshore wind power foundation comprises the following steps:

[0057] S1 Monitoring environmental conditions: Use ultrasonic wind speed and direction sensors to monitor the wind speed and direction around the wind power foundation in real time, and transmit the monitoring data to the control system;

[0058] S2 calculates the overturning moment: The control system calculates the wind force on the wind power foundation based on the monitoring data, and calculates the overturning moment M generated by the wind based on the wind force action point and the center of gravity position of the wind power foundation. t , satisfying the following relationship:

[0059]

[0060] M t =F w ·d

[0061] In the formula, F w is the wind force, ρ is the air density, A is the wind action area, that is, the projected area of ​​the fan blades, C d is the wind resistance coefficient, V is the wind speed, and d is the horizontal distance from the wind action point to the center of gravity of the wind turbine foundation;

[0062] S3 Calculate the anti-overturning moment: Calculate the anti-overturning moment M according to the gravity of the wind power foundation and the submerged depth of the ballast caisson 13 a , satisfying the following relationship:

[0063] M a=μ·Wxh

[0064] In the formula, W is the gravity of the wind turbine foundation, h is the vertical distance from the center of gravity of the wind turbine foundation to its bottom, and μ is the safety factor, which is 0.6;

[0065] S4 adjusts the depth of the ballast caisson 13: The control system analyzes and determines whether the wind power foundation is safe based on the calculation results of steps S2 and S3. t ≥M a When it is judged to be unsafe, the control system adjusts the depth of the ballast caisson 13 through the slide rope 14 and the slide rail 15 until M t <M a , wherein the adjusted depth h' of the ballast caisson 13 satisfies the following relationship:

[0066] h'=h+d box

[0067] M a ′=μ·W·h′

[0068] M a ′>M t

[0069] Where, d box The additional depth of the ballast caisson 13, M a ' is the anti-overturning moment of the wind power foundation after the ballast caisson 13 is adjusted to a depth h';

[0070] S5 Data Recording and Analysis: All monitoring data, calculation results and adjustment records are archived for subsequent analysis and optimization of the design and operation of wind power foundations. Through data analysis, potential risk factors can be identified and provide reference for future wind power projects.

[0071] By calculating the overturning moment, the present invention can ensure that the center of gravity and the center of buoyancy of the wind power foundation remain in the appropriate position, effectively predict whether the wind power foundation will overturn due to external waves, wind or other factors, take measures in advance to adjust the sinking depth, reduce the risk of overturning of the wind power foundation, and ensure that the wind power foundation can operate safely under various environmental conditions. By accurately calculating the required sinking depth, the possibility of over-design can be reduced, and unnecessary excessive sinking of the caisson can be avoided, thereby reducing construction and maintenance costs.

[0072] As a preferred embodiment of the present invention, the overturning moment in step S2 also includes the overturning moment generated by the wave load, which satisfies the following relationship:

[0073] M s =M t +M w

[0074] M w=ρ'·g·H·A'·d'

[0075] Where M s is the total overturning moment on the wind turbine foundation, M w is the overturning moment generated by wave load, ρ' is the seawater density, A' is the wave action area, H is the wave height, and d' is the horizontal distance from the wave load action point to the center of gravity of the wind turbine foundation.

[0076] It should be understood that the above-mentioned embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations thereof based on the present invention; the variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations all fall within the scope of protection of the present invention.

Claims

1. A deep-water suspended ballast floating offshore wind power foundation, characterized by: It comprises a three-column semi-submerged foundation for supporting a wind turbine, a mooring system and a control system for automatic control of the wind power foundation. The three-column semi-submerged foundation comprises three vertical columns, a strut and a ballast caisson. The three vertical columns are equally spaced to form an equilateral triangle. The two ends of the strut are respectively connected to the adjacent vertical columns. The ballast caisson is arranged at the midpoint of the equilateral triangle and is connected to a slide rail arranged on the side wall of the vertical column through a slide cable. The control system controls the slide cable to slide up and down relative to the slide rail so that the ballast caisson moves up and down relative to the vertical column. The mooring system comprises a mooring cable and a mooring anchor corresponding to the vertical columns one by one. One end of the mooring cable is fixedly installed at the bottom of the vertical column, and the other end is connected to the mooring anchor. The mooring anchor is anchored to the seabed.

2. The water-adaptable suspended ballast floating offshore wind power foundation according to claim 1 is characterized by: The bottom of the ballast caisson is provided with a heave plate with an adaptive telescopic width.

3. The water-adaptable suspended ballast floating offshore wind power foundation according to claim 1 is characterized by: The ballast caisson adopts a concrete cylindrical structure. The control system controls the moving distance of the slide cable on the slide rail, thereby controlling the moving distance of the ballast caisson relative to the vertical column, thereby completing the center of gravity adjustment of the three-column semi-submerged foundation.

4. The water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 1 is characterized by: The ballast caisson adopts a hydraulic cabin structure. The hydraulic cabin injects or discharges seawater into or out of the interior of the hydraulic cabin through a hydraulic pump electrically connected to the control system to change the weight and buoyancy of the hydraulic cabin and complete the up and down movement of the ballast caisson relative to the vertical column. Pressure sensors are provided on the inner and outer walls of the hydraulic cabin, which are respectively used to monitor the depth of seawater and the changes in water pressure in the hydraulic cabin in real time.

5. The water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 1, characterized in that: The mooring cable is a catenary steel anchor chain, and the mooring anchor is a suction cylinder anchor or a caisson anchor.

6. The water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 1 is characterized by: The support rods include horizontal support rods and diagonal support rods. The top end of each vertical column is connected to the top end of the adjacent vertical column through the horizontal support rod, the bottom end of each vertical column is connected to the bottom end of the adjacent vertical column through the horizontal support rod, and the bottom end of each vertical column is connected to the top end of the adjacent vertical column through the diagonal support rod.

7. The water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 1 is characterized by: The control system includes a monitoring subsystem and a control subsystem. The monitoring subsystem monitors the wind speed and wind direction information in real time through an ultrasonic wind speed and wind direction sensor installed on the three-column semi-submersible foundation, and feeds back the information to the control system. The control system analyzes the wind speed and wind direction information and issues dynamic control commands to the control subsystem. The control subsystem adjusts the distance between the ballast caisson and the vertical column according to the command.

8. A method for using a deep-water suspended ballast floating offshore wind power foundation, characterized in that: Used for a suspended ballast floating offshore wind power foundation adapted to water depth as claimed in any one of claims 1 to 7, the method of use comprising the following steps: S1 Monitoring environmental conditions: using ultrasonic wind speed and wind direction sensors to monitor the wind speed and wind direction around the wind power foundation in real time, and transmitting the monitoring data to the control system; S2 Calculate the overturning moment: The control system calculates the wind force on the wind power foundation according to the monitoring data, and calculates the overturning moment M generated by the wind force based on the wind force action point and the center of gravity position of the wind power foundation. t , satisfying the following relationship: M t =F w ·d In the formula, F w is the wind force, ρ is the air density, A is the wind action area, that is, the projected area of ​​the fan blades, C d is the wind resistance coefficient, V is the wind speed, and d is the horizontal distance from the wind action point to the center of gravity of the wind turbine foundation; S3 Calculate the anti-overturning moment: Calculate the anti-overturning moment M according to the gravity of the wind power foundation and the submerged depth of the ballast caisson a , satisfying the following relationship: M a =μ·W·h Wherein, W is the gravity of the wind turbine foundation, h is the vertical distance from the center of gravity of the wind turbine foundation to its bottom, and μ is the safety factor, which is less than 1.0; S4 adjusts the depth of the ballast caisson: The control system analyzes and determines whether the wind power foundation is safe according to the calculation results of steps S2 and S3. t ≥M a When it is judged to be unsafe, the control system adjusts the depth of the ballast caisson through the slide rope and the slide rail until M t <M a , wherein the adjusted depth h' of the ballast caisson satisfies the following relationship: h'=h+d box M a ′=μ·W·h′ M a ′>M t Where, d box The additional depth required for the ballast caisson, M a ' is the anti-overturning moment of the wind power foundation after the ballast caisson is adjusted to a depth h'; S5 Data Recording and Analysis: All monitoring data, calculation results and adjustment records are archived for subsequent analysis and optimization of the design and operation of the wind power foundation. Through data analysis, potential risk factors can be identified and provide reference for future wind power projects.

9. The method for using the water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 8, characterized in that: The overturning moment in step S2 also includes the overturning moment generated by the wave load, which satisfies the following relationship: M s =M t +M w M w =ρ'·g·H·A'·d' Where M s is the total overturning moment on the wind turbine foundation, M w is the overturning moment generated by wave load, ρ' is the seawater density, A' is the wave action area, H is the wave height, and d' is the horizontal distance from the wave load action point to the center of gravity of the wind turbine foundation.

10. The method for using the water depth-adaptable suspended ballast floating offshore wind power foundation according to claim 8, characterized in that: The safety factor μ is set to 0.6.

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