CN113339200A

CN113339200A - Ultra-large semi-submerged floating type wind turbine foundation based on tuned mass damper

Info

Publication number: CN113339200A
Application number: CN202110767571.8A
Authority: CN
Inventors: 王文华; 赵志新; 李昕; 施伟
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-09-03
Anticipated expiration: 2041-07-07
Also published as: CN113339200B

Abstract

The invention provides an ultra-large semi-submersible floating type wind turbine foundation based on a tuned mass damper, and belongs to the technical field of offshore wind power. The foundation heaving upright post is fixed at the bottom of the main upright post; the upper three-leg transition member is responsible for connecting the wind turbine and the main upright post; the vertical swinging upright posts are connected through rectangular lower floating boxes with the same height as the vertical swinging upright posts and are in a regular triangle shape, and rod piece structures such as cross braces, inclined braces and the like are not required to be arranged on the whole floating foundation; the lower floating box is divided into an upper layer and a lower layer by a cabin partition plate, and a horizontal tuned mass damper device is arranged on the upper layer; the heave upright post and the lower floating box are used as a heave suppression mechanism to replace a heave plate with a complex construction process. The invention is suitable for the ultra-large wind turbine with the water depth of more than 50m and the power of more than 7MW, can effectively inhibit the resonance between the wind turbine and the floating foundation under the condition of strong coupling of strong wind, large waves and sea, increases the running stability of the ultra-large semi-submersible floating wind turbine system and reduces the fatigue damage of the wind turbine structure.

Description

Ultra-large semi-submerged floating type wind turbine foundation based on tuned mass damper

Technical Field

The invention relates to the technical field of offshore wind power, in particular to an ultra-large semi-submersible floating type wind turbine foundation based on a tuned mass damper.

Background

At present, large-scale wind turbine generators installed and applied on the sea are mainly 3-5MW, shallow sea fixed foundations are generally adopted, and as offshore wind energy resources in shallow water are developed completely, deep sea wind energy resources have the advantages of large reserves, high wind speed, stable wind conditions, no land occupation, no noise and no visual pollution, and the like, so that the trend of the offshore wind power industry to deep sea offshore areas is a necessary trend. However, when the water depth is greater than 50m, the cost of the fixed foundation will increase sharply with the increase of the seawater depth, and the technical and economic indicators can be improved significantly by adopting the floating foundation. In consideration of the cost and the benefit of deep sea wind energy development, economic analysis shows that a wind turbine with larger single machine capacity is needed to reduce the leveling power generation cost (LCOE), and the upsizing of the offshore wind turbine is a necessary choice, so that an offshore wind turbine supporting platform with larger volume is correspondingly needed. The currently widely adopted floating type wind turbine foundation mainly comprises a Spar type foundation, a semi-submersible type foundation and a TLP type foundation. Because the continental shelf in China has wide extension range and gentle slope, the water depth range of 50-120m covers most of the sea area of the yellow sea in China, almost all the sea areas of the east sea and the Taiwan strait and the offshore sea area of the south sea, and simultaneously, the factors of stability, hydrodynamic performance, construction and installation cost and the like are comprehensively considered, and the semi-submersible foundation is widely applied because the semi-submersible foundation has stronger restoring moment and good stability, has wide applicable water depth range, simple installation mode and flexible movement and can adopt towing installation. The existing semi-submersible floating type wind turbine foundation is mostly in a barge type or truss type structure of three upright posts and brace rods, and the existing semi-submersible floating type wind turbine foundation also has the following defects:

1) the traditional semi-submersible floating type wind turbine foundation is mainly connected with each upright post through rod piece structures such as cross braces and inclined braces, and the stability required by a wind turbine system is obtained by utilizing the restoring moment provided by the waterline area of the upright posts. However, when the wind turbine system operates normally, the rod structure goes out of water and causes real-time change of the area of the water plane, which affects the operation stability of the wind turbine system. In addition, fatigue sensitive areas can be formed at connection points of the inclined struts, the stand columns and the inclined struts in the multi-inclined strut structure, so that a plurality of fatigue design, manufacturing difficulty and structural fatigue failure risks are brought to a semi-submersible floating foundation, especially for an ultra-large floating wind turbine with the power of more than 7MW, the stand column distance is increased to obtain a target waterplane area inertia moment, and the length, stress and structural fatigue of the rod piece structure are greatly increased.

2) The floating type wind turbine is a rigid-flexible hybrid multi-body system with complex wind turbines (comprising structures such as blades, hubs and engine rooms), a tower frame, a floating type foundation and a mooring system and strong nonlinear interaction (aerodynamic force-elasticity-hydrodynamic force mutual coupling), the dynamic response characteristics of the floating type wind turbine are extremely complex, the unsteady effect of the floating type foundation is obvious, and the micro-amplitude movement of the floating type wind turbine can cause the structure of a high-rise wind turbine to generate obvious strong nonlinear movement. In addition, each cabin of the basic ballast water tank of the semi-submersible floating wind turbine is relatively independent, so the movement stroke of the ballast water is obviously limited, under the action of asymmetric or strong coupling sea conditions of strong wind and big waves, the foundation of the semi-submersible floating wind turbine has the problem of insufficient vibration resistance, and the mass of the overweight rotor and cabin of the ultra-large floating wind turbine can further amplify the vibration effect, so the wind energy conversion efficiency and the power output stability of the wind turbine are greatly reduced, and the adverse effect is caused on the safe operation reliability and the structural fatigue damage of the wind turbine system.

Disclosure of Invention

In order to solve the problems in the background technology, the invention provides an ultra-large semi-submersible floating wind turbine foundation based on a tuned mass damper, which is applied to ultra-large wind turbines with the water depth of more than 50m and the water depth of more than 7 MW. The prefabricated upper three-leg offshore three-pile wind turbine transition member and the prefabricated lower floating box are connected with the stand columns to cancel a rod structure, so that the fatigue damage of the floating structure is reduced as much as possible, and the relative deformation of the stand columns is limited by increasing the rigidity of the transition member and the rigidity of the lower floating box to replace the function of an inclined strut; the arrangement of the mass-adjusting dampers with equal mass in the lower buoyancy tank replaces part of static ballast, so that the vibration response of the semi-submersible floating foundation under the sea condition of complex and changeable strong coupling action of wind, wave and current can be effectively reduced, and the resonance reaction generated by the strong nonlinear coupling action between the wind turbine and the floating foundation can be effectively avoided; the heaving upright post and the lower floating box replace a heaving plate as a heaving restraining mechanism, so that the gravity center of the semi-submersible floating foundation can be reduced, the integral stability of a wind turbine system is improved, the vertical additional mass and the damping of the floating foundation can be increased, the heaving inherent period is further increased, the heaving motion response amplitude is reduced, and the manufacturing and construction process of the heaving plate with complex structure is further simplified.

The technical scheme of the invention is as follows:

an ultra-large semi-submerged floating wind turbine foundation based on a tuned mass damper comprises side upright columns, a lower floating box 4, a horizontal tuned mass damper 5, an upper tripod transition member 6 and a mooring system 15; the side upright columns comprise three main upright columns 1 with equal diameters and three heaving upright columns 2 with equal diameters, the heaving upright columns 2 are fixed at the bottoms of the main upright columns 1, and the heaving upright columns 2 are connected into a regular triangle through rectangular lower floating boxes 4 with equal height; the lower buoyancy tank 4 is divided into an upper layer and a lower layer by a lower buoyancy tank cabin partition plate 13, the lower layer is used for filling static ballast, and the upper layer is provided with a horizontal tuned mass damper device 5; two ends of the horizontal tuned mass damper 5 are respectively connected with the shell plate of the heaving upright post 2, and an anti-collision rubber block 19 is arranged at the joint; a slideway parallel to the central line of the lower floating box 4 is arranged on the cabin partition plate 13 of the lower floating box, and the horizontal tuned mass damper 5 moves in the slideway, so that the anti-vibration performance of the ultra-large semi-submersible floating foundation under the strong coupling sea condition is improved, and the wind energy conversion efficiency of a wind turbine is improved; the upper three-leg transition member 6 is connected between the wind turbine tower 7 and the side upright post, the upper three-leg transition member 6 comprises three box-shaped heavy beams with equal sections and a central upright post, the box-shaped heavy beams are downwards inclined along the central upright post and are uniformly distributed in a radial mode, and the lower end of each box-shaped heavy beam is connected with the top 1 of the main upright post.

The diameter of the heave upright post 2 is larger than that of the main upright post 1; longitudinal girders, longitudinal bones, vertical and horizontal strengthening materials are distributed on the inner sides of the outer shell plates of the main upright column 1 and the heave upright column 2; a ship leaning piece 11 is installed at the position, close to the sea level, of the main upright post 1, and a maintenance walking channel 12 is arranged on the box-shaped heavy beam of the main upright post 1 and the upper tripod transition member 6, so that the operation and maintenance ship can lean against and troubleshoot a wind turbine system.

The upper three-leg transition member is a prefabricated offshore three-pile wind turbine steel foundation transition member, a reinforcing component 14 is arranged at the joint of the top surface of the upper three-leg transition member 6 and the bottom of the tower 7, and the reinforcing component 14 comprises a reinforcing ring and a reinforcing rib; stiffening ribs are arranged at the joints of the upper three-leg transition members 6 and the side upright columns so as to improve the strength of the semi-submersible floating foundation; the bottom of the upper three-legged transition component 6 supported by the side upright posts is positioned above the maximum wave height of the ultra-large semi-submersible floating wind turbine foundation under the sea condition; the infrared alarm 20 is arranged on the central bottom surface of the upper three-leg transition member 6 and is responsible for automatically giving an alarm when ships in the surrounding sea area are detected, so that unnecessary loss caused by collision of the ships and the floating foundation is avoided.

The horizontal tuned mass damper 5 comprises a solid mass 16, a spring damper 17 and a damper 18, the solid mass 16 being located in the middle, the spring damper 17 and the damper 18 being located on either side.

The side upright posts and the lower floating box 4 are both of hollow structures so as to provide buoyancy required by a semi-submersible floating foundation; the side upright posts are divided into a plurality of cabins 3 by adopting partition plates, ballast is arranged, and floating type foundation balance is adjusted; longitudinal girders are arranged below the lower floating box compartment partition plate 13 to improve the strength of the lower floating box compartment partition plate 13.

A wind turbine is arranged on the top surface of the center of the upper three-legged transition member 6, the tower footing and the transition member are welded into a whole, wind load borne by the wind turbine is transmitted to the upper three-legged transition member 6 through the tower frame, and then is dispersed to the side upright posts through the inclined box-shaped heavy beams, so that overlarge stress concentration at the tower footing of the wind turbine is avoided as much as possible.

The mooring system 15 comprises three mooring cables made of synthetic fiber ropes, the three mooring cables are radially and uniformly distributed around the semi-submersible floating foundation, one section of the mooring cable is connected to the upper position of the joint of the main upright post and the heaving upright post, and the other end of the mooring cable is fixed on the seabed through an anchoring system.

A wind turbine is arranged on the top surface of the center of the upper three-leg transition member 6, the tower footing and the upper three-leg transition member 6 are welded into a whole, wind load borne by the wind turbine is transmitted to the upper three-leg transition member 6 through a tower frame, and then is dispersed to the side upright posts through the inclined box-shaped heavy beams, so that overlarge stress concentration at the tower footing of the wind turbine is avoided as much as possible.

Adopt the baffle to be divided into a plurality of cabins 3 with the side column, conveniently arrange the ballast and adjust the floating formula basis balanced.

The draft is adjusted to ensure that the floating foundation meets the requirement of the operation air gap.

The invention has the beneficial effects that:

1) the invention combines the characteristics of Spar type and semi-submerged floating foundation, adopts large column span, small water surface line and large submerged design, the water surface of the side column provides the stability required by the wind turbine system, and the fixed ballast is positioned at the bottom of the floating foundation, thereby well solving the conflict between towing and in-place motion performance and greatly improving the motion performance of the floating wind turbine foundation. Meanwhile, the use of a high-rigidity prefabricated upper tripod transition member and a lower floating box of the offshore three-pile wind turbine steel foundation for replacing a cross brace and an inclined strut effectively avoids the formation of a fatigue sensitive area with a large range at the key joint of the floating foundation, reduces the pressure of structural fatigue design, limits the relative deformation of the stand columns, reduces the fatigue damage of the floating foundation structure, prolongs the service life of the floating foundation and greatly reduces the operation and maintenance cost. In addition, the hollow inner space of the invention is provided with a marine culture or seawater desalination device, thus realizing the multipurpose utilization of the offshore wind field.

1) Horizontal tuned mass dampers with equal mass are respectively distributed in the lower buoyancy tanks to replace partial static ballast so as to realize the stability control of the foundation of the ultra-large semi-submersible floating wind turbine, which not only can effectively inhibit the dynamic response of the floating foundation under the strong coupling sea condition of asymmetry or strong wind and big waves, but also avoids the resonance reaction of the floating foundation and an upper wind turbine, ensures the stability of the movement of the semi-submersible floating foundation under the complicated and changeable marine environment conditions, the reliability of the wind turbine structure and the safety of a mooring anchor chain, and is especially important for the ultra-large wind turbine with ultra-long flexible blades, ultra-high flexible tower, ultra-heavy rotors and engine room mass.

2) The heave self-oscillation period of the semi-submersible floating foundation is 20-50s, and is closer to the ordinary wave period compared with the motion with other degrees of freedom, so that the heave response control of the semi-submersible floating foundation is always a hot spot problem. Compared with the traditional semi-submersible floating foundation, the semi-submersible floating foundation adopts the heaving upright post and the lower floating box to replace a heaving plate as a heaving restraining mechanism, so that the movement and the acceleration of the whole semi-submersible floating foundation in the heaving direction are greatly reduced, and the requirement on the structural strength is reduced. In addition, the 'heave upright post and the lower floating box' not only simplify the complex construction process of the heave plate, but also can obviously reduce the gravity center of the semi-submerged floating foundation, increase the stability of the semi-submerged floating foundation and enhance the storm resistance of the semi-submerged floating foundation. In addition, the prefabricated offshore three-pile wind turbine steel foundation transition member can realize modular assembly, integral towing and integral installation of the semi-submersible floating foundation, greatly improves the manufacturing and installing efficiency of the semi-submersible floating foundation and reduces the construction cost of the semi-submersible floating foundation.

Drawings

FIG. 1 is a perspective view of the overall construction of the present invention;

FIG. 2 is a schematic view of a prefabricated upper tripod transition member of the present invention;

FIG. 3 is a layout of the horizontal type tuned mass damper within the pontoons of the present invention;

FIG. 4 is a schematic view of the mooring element of the present invention;

figure 5 is a schematic view of the chamber partition in the pontoons of the present invention.

In the figure: 1. a main upright post; 2. a heave column; 3. a cabin; 4. a lower buoyancy tank; 5. a horizontal tuned mass damper; 6. an upper tripod transition member; 7. a tower; 8. a nacelle; 9. a hub; 10. a wind turbine blade; 11. a boat-holding member; 12. repairing the walking channel; 13. a lower buoyancy tank compartment partition; 14. a reinforcement assembly; 15. a mooring system; 16. a solid mass block; 17. a spring damper; 18. a damper; 19. an anti-collision rubber block; 20. an infrared alarm; 21. an anchoring system.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

As shown in FIG. 1, the ultra-large semi-submersible floating wind turbine foundation based on the tuned mass damper comprises an upper three-leg transition member 6, side columns, a lower floating box 4 and a mooring system 15, wherein the central top surface of the upper three-leg transition member 6 is connected with the bottom of a tower 7, and the ultra-large semi-submersible floating wind turbine further comprises key components such as a cabin 8, a hub 9 and wind turbine blades 10.

The side stand includes that equal cross-section's head mast 1 and heaving upright 2, heaving the upright and being located the head mast bottom, and the diameter of heaving the upright is greater than the head mast's diameter, and when semi-submerged floating foundation moved, the waterline face area of three side stand was the same all the time, and then semi-submerged floating foundation obtained better stability and inherent cycle and kept unchanged. In addition, in order to increase the strength of the side columns, the outer shell plates of the heaving columns 2 are connected with the horizontal type tuned mass damper devices in the lower floating box 4, and longitudinal girders, longitudinal ribs, vertical and horizontal strengthening materials are distributed on the inner sides of the outer shell plates of the main columns 1 and the heaving columns 2.

The prefabricated steel foundation upper tripod transition member 6 is adopted for connecting the tower frame 7 and the side upright columns, the maximum horizontal shearing force of the tower top of a DTU10MW sample wind turbine is 4605kN, so the maximum shearing force borne by the box-shaped heavy beam of the upper tripod transition member 6 is 2302.5kN, finally, the factors such as the stability, the strength and the steel consumption of the semi-submersible floating wind turbine foundation are comprehensively considered, the span, the cross section size and the downward inclination angle of the box-shaped heavy beam of the upper tripod transition member 6 are determined, and the reasonable inclination angle is within the range of 10-15 degrees.

The top ends of the main upright posts 1 are respectively connected with the bottom ends of the box-shaped heavy beams of the upper three-foot transition members 6, and reinforcing assemblies 14 for bearing enough load transmission are arranged at the connection positions. The three heaving upright columns 2 are respectively connected with the lower buoyancy tanks 4 which pass through the centers of the two heaving upright columns 2 and have the same height with the centers of the two heaving upright columns, and are in a regular triangle shape. However, the lower buoyancy tank 4 is adopted to replace a rod structure to be used for connecting the side upright columns, so that the relative deformation of the side upright columns is limited and the fatigue damage is reduced, and the 'heaving upright column + lower buoyancy tank' can be used as a heaving suppression mechanism, so that the gravity center of the floating foundation can be reduced, the vertical additional mass, the radiation damping and the natural period of heaving of the floating foundation are increased, and the movement and the acceleration in the heaving direction are suppressed, so that the floating foundation obtains good hydrodynamic performance and stability, the movement performance of the floating foundation is improved, and the wind energy conversion efficiency of the wind turbine is improved. In addition, a prefabricated lower floating box cabin partition plate 13 is adopted to divide the lower floating box 4 into an upper layer and a lower layer at the downward position, the lower layer is used for filling static and non-liquid ballast and can adopt concrete or cement; the upper layer is used for laying the horizontal tuned mass damper 5 with equal mass to replace a partial static ballast, the horizontal tuned mass damper 5 comprises a solid mass block 16, a spring shock absorber 17 and a damper 18, a slide way parallel to the central line of the lower buoyancy tank 4 is further laid on the top surface of the cabin partition plate 13 of the lower buoyancy tank, two ends of the horizontal tuned mass damper 5 are respectively connected with the outer shell plate of the heaving upright post 2, and an anti-collision rubber block 19 is arranged at the joint to prevent the solid mass block 16 from causing collision damage to the heaving upright post 2. In addition, since the lower buoyancy tank compartment partition 13 bears the weight of the solid mass 16, stringers are laid on the bottom surface thereof to improve the strength of the lower buoyancy tank compartment partition 13.

Go up the three-legged transition member 6 top surface and be connected with the tower 7 bottom surface to lay reinforcing component 14 at the junction, including stiffening rib and reinforcing ring, make it can bear the transmission of sufficient load, and reduce the stress concentration of the great department of tower 7 bottom intensity, in addition, also lay reinforcing ring and infrared alarm 20 in last three-legged transition member 6 bottom surface, can automatic the police dispatch newspaper when it detects the ship in sea area on every side, avoid boats and ships and semi-submerged floating foundation to collide. The ship leaning piece 11 is installed at the position, close to the sea level, of the three main columns 1, and therefore the ship side leaning is convenient to maintain. The ship leaning piece 11 adopts a truss structure, and the connecting rods are a plurality of hollow high-strength corrosion-resistant structural steel pipes. Maintenance walking channels 12 are arranged on the main upright post 1 and the box-shaped heavy beams of the upper three-leg transition member 6, if equipment in the engine room 8 fails, a maintenance ship can be leaned near the main upright post 1, and then maintenance personnel reach the bottom of the tower 7 through the maintenance walking channels 12 and enter the engine room through the tower 7 for maintenance. The mooring system 15 comprises three mooring cables made of synthetic fiber ropes and is radially arranged at 120 degrees, one ends of the three mooring cables are respectively connected with the shell plate of the main upright post 1 close to the lower position of the heave upright post 2, the other ends of the three mooring cables are respectively connected with an anchoring system 21 fixed on the seabed, and the anchoring system 21 adopts a pile anchor, a suction bucket anchor or a gravity anchor.

Claims

1. An ultra-large semi-submerged floating wind turbine foundation based on a tuned mass damper is characterized by comprising side upright columns, a lower floating box (4), a horizontal tuned mass damper (5), an upper three-leg transition member (6) and a mooring system (15); the side upright columns comprise three main upright columns (1) with equal diameters and three heaving upright columns (2) with equal diameters, the heaving upright columns (2) are fixed at the bottoms of the main upright columns (1), and the heaving upright columns (2) are connected with rectangular lower floating boxes (4) with equal heights to form a regular triangle; the lower buoyancy tank (4) is divided into an upper layer and a lower layer by a cabin partition plate (13) of the lower buoyancy tank, the lower layer is used for filling static ballast, and a horizontal tuned mass damper device (5) is distributed on the upper layer; two ends of the horizontal tuned mass damper (5) are respectively connected with the shell plate of the heaving upright post (2), and an anti-collision rubber block (19) is arranged at the joint; a slideway parallel to the central line of the lower buoyancy tank (4) is arranged on the cabin partition plate (13) of the lower buoyancy tank, and the horizontal tuned mass damper (5) moves in the slideway; the upper three-leg transition member (6) is connected between the wind turbine tower (7) and the side upright, the upper three-leg transition member (6) comprises three box-shaped heavy beams with equal sections and a central upright, the box-shaped heavy beams are downwards inclined along the central upright and are uniformly distributed in a radial shape, and the lower ends of the box-shaped heavy beams are connected with the top (1) of the main upright.

2. The tuned mass damper based ultra-large semi-submerged floating wind turbine foundation of claim 1, wherein the diameter of the heaving column (2) is larger than that of the main column (1); longitudinal girders, longitudinal bones, vertical and horizontal strengthening materials are distributed on the inner sides of the shell plates of the main upright column (1) and the heave upright column (2); a ship leaning piece (11) is arranged at the position, close to the sea level, of the main upright post (1), and a maintenance walking channel (12) is arranged on the main upright post (1) and a box-shaped heavy beam of the upper tripod transition member (6).

3. The ultra-large semi-submersible floating wind turbine foundation based on tuned mass dampers according to claim 1 or 2, characterized in that a reinforcing component (14) is arranged at the joint of the top surface of the upper three-foot transition member (6) and the bottom of the tower (7), and the reinforcing component (14) comprises a reinforcing ring and a reinforcing rib; stiffening ribs are arranged at the joints of the upper three-leg transition members (6) and the side upright columns; the bottom of the side upright post supporting upper three-leg transition member (6) is positioned above the maximum wave height of the ultra-large semi-submersible floating wind turbine foundation under the sea condition; an infrared alarm (20) is arranged on the central bottom surface of the upper tripod transition member (6) and is responsible for automatically giving an alarm when ships in the surrounding sea area are detected.

4. The ultra-large semi-submersible floating wind turbine foundation based on tuned mass dampers according to claim 1 or 2, characterized in that the horizontal tuned mass dampers (5) comprise a solid mass (16), a spring shock absorber (17) and a damper (18), the solid mass (16) is located in the middle, and the spring shock absorber (17) and the damper (18) are respectively located on both sides.

5. The tuned mass damper based ultra-large semi-submerged floating wind turbine foundation according to claim 3, wherein the horizontal tuned mass damper (5) comprises a solid mass (16), a spring shock absorber (17) and a damper (18), the solid mass (16) is located in the middle, and the spring shock absorber (17) and the damper (18) are respectively located on two sides.

6. The ultra-large semi-submersible floating wind turbine foundation based on tuned mass dampers according to claim 1, 2 or 5, characterized in that the side columns and the lower buoyancy tanks (4) are both hollow structures; the side upright posts are divided into a plurality of cabins (3) by adopting partition plates, and ballast is arranged and floating type foundation balance is adjusted; longitudinal girders are arranged below the lower floating box compartment partition plate (13) to improve the strength of the lower floating box compartment partition plate (13).

7. The ultra-large semi-submerged floating wind turbine foundation based on the tuned mass damper as claimed in claim 3, wherein the side columns and the lower buoyancy tank (4) are both hollow structures; the side upright posts are divided into a plurality of cabins (3) by adopting partition plates, and ballast is arranged and floating type foundation balance is adjusted; longitudinal girders are arranged below the lower floating box compartment partition plate (13) to improve the strength of the lower floating box compartment partition plate (13).

8. The ultra-large semi-submerged floating wind turbine foundation based on the tuned mass damper as claimed in claim 4, wherein the side columns and the lower buoyancy tank (4) are both hollow structures; the side upright posts are divided into a plurality of cabins (3) by adopting partition plates, and ballast is arranged and floating type foundation balance is adjusted; longitudinal girders are arranged below the lower floating box compartment partition plate (13) to improve the strength of the lower floating box compartment partition plate (13).