阅读说明：本技术 一种分形结构的新型双体漂浮式风力机平台 (Novel double-body floating type wind turbine platform with fractal structure ) 是由 岳敏楠 李春 肖俊青 刘青松 许子非 金江涛 于 2021-01-22 设计创作，主要内容包括：本发明公开了一种分形结构的新型双体漂浮式风力机平台,包括：叶片、与所述叶片固接的发电机舱、与所述发电机舱固接的支撑柱、与所述支撑柱固接的上部浮舱及与所述上部浮舱通过筋腱连接的下部压舱；所述上部浮舱包括与所述支撑柱固接的立柱及与所述立柱固接的浮箱,所述浮箱采用空心箱结构且该浮箱底部上开设有分形的华夫格多孔。根据本发明,提高了该平台的稳定性,具有经济实用性,且具有良好的水动力稳定性。(The invention discloses a novel double-body floating type wind turbine platform with a fractal structure, which comprises: the device comprises blades, a generator room fixedly connected with the blades, a supporting column fixedly connected with the generator room, an upper floating cabin fixedly connected with the supporting column and a lower ballast connected with the upper floating cabin through tendons; the upper floating cabin comprises an upright post fixedly connected with the support post and a floating box fixedly connected with the upright post, the floating box adopts a hollow box structure, and fractal waffle cells are arranged on the bottom of the floating box. According to the invention, the stability of the platform is improved, the economic practicability is realized, and the hydrodynamic stability is good.)

1. The utility model provides a novel formula wind turbine platform is floated to binary of fractal structure which characterized in that includes:

the wind power generation device comprises blades (1), a generator room (2) fixedly connected with the blades (1), a supporting column (3) fixedly connected with the generator room (2), an upper floating cabin (6) fixedly connected with the supporting column (3) and a lower ballast (8) connected with the upper floating cabin (6) through tendons (7);

the upper floating cabin (6) comprises an upright post fixedly connected with the support post (3) and a floating box fixedly connected with the upright post, the floating box adopts a hollow box structure, and fractal waffle grids are arranged on the bottom of the floating box.

2. The novel double-body floating type wind turbine platform with the fractal structure as claimed in claim 1, wherein the upper floating cabin (6) and the lower ballast (8) are connected through a plurality of tendons (7), one end of each tendon (7) is fixedly connected to a tendon upper connection point (10) of the upper floating cabin (6), and the other end of each tendon is fixedly connected to a tendon lower connection point (11) of the lower ballast (8).

3. The novel double-body floating type wind turbine platform with the fractal structure is characterized in that the upper floating cabin (6) is connected with the lower ballast (8) through six tendons (7), the angle between every two tendons (7) of the upper floating cabin (6) is sixty degrees, and the angle between every two tendons (7) on the lower ballast (8) is one hundred twenty degrees.

4. The novel double-body floating wind turbine platform with a fractal structure as claimed in claim 1, wherein catenary fastener (5) is fixed on the upper floating cabin (6), and the catenary fastener (5) is used for keeping the platform moored and positioned.

5. A novel double-body floating wind turbine platform with a fractal structure as claimed in claim 4, wherein the catenary mooring element (5) comprises three cables, the cables are fixedly connected to the upper buoyancy chamber (6) and the included angle between each two cables is one hundred twenty degrees, and the diameter of each cable is 0.3 m.

Technical Field

The invention relates to the technical field of wind power generation, in particular to a novel double-body floating type wind turbine platform with a fractal structure.

Background

Wind power generation has become an important component of global clean energy. The offshore floating wind turbine has the advantages of wide applicable water depth range, easiness in large-scale, convenience in moving, flexible disassembly and the like, and offshore wind power resources in China are rich and have huge potential, and the offshore floating wind turbine is close to a load center mainly in eastern economically developed areas and is convenient to consume on the spot, so that the offshore floating wind turbine becomes one of the key development directions in the field in recent years.

At present, in order to reduce the electricity consumption cost, the offshore floating type wind turbine is undergoing a large-scale or even ultra-large-scale process and is continuously developing to the open sea. The condition of the sea bottom in China is complex, the sea bottom is uneven and has large fluctuation, the interference of wave action on a wind turbine system is aggravated along with the increase of offshore distance and water depth, particularly the high-speed wind load of the open sea is obvious, and the safe and stable operation and installation process of the floating wind turbine system faces huge challenges. The existing floating platform mainly comprises a semi-submersible platform, a tension leg platform and a deepwater buoy platform, and the existing semi-submersible platform has the disadvantages that the size of a buoy box is large, the wave force borne in the horizontal direction is large, the surging and swaying motions of the platform are difficult to control, the structure weight is large, and the nodes are complex to manufacture and have certain difficulty; the Tension Leg Platform (TLP) tension tendon has high cost, a special installation ship is required for platform installation, the installation cost is also high, the inherent period of the heave motion of the platform is small due to the high rigidity of the tension tendon, the platform is easy to resonate with a high-order component in waves, namely high-order bounce, and meanwhile, the requirement on the upper bearing is high, and the pretension of the tension tendon is directly influenced by the change of the bearing, so that the performance of the platform is influenced; the mainstream deepwater buoy platform uses a single-column floating foundation (Spar) as a main body, has small waterplane area, is insensitive to wave excitation, has good hydrodynamic performance, is suitable for sea areas with severe environment and deep sea areas, and has the defects of overlarge size span, difficult manufacture and installation, high cost, insufficient rigidity of a catenary in the rolling and pitching directions and easy generation of large stress.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a novel double-body floating type wind turbine platform with a fractal structure, which improves the stability of the platform, has economic practicability and good hydrodynamic stability. To achieve the above objects and other advantages in accordance with the present invention, there is provided a novel double-body floating type wind turbine platform of a fractal structure, including:

the device comprises blades, a generator room fixedly connected with the blades, a supporting column fixedly connected with the generator room, an upper floating cabin fixedly connected with the supporting column and a lower ballast connected with the upper floating cabin through tendons;

the upper floating cabin comprises an upright post fixedly connected with the support post and a floating box fixedly connected with the upright post, the floating box adopts a hollow box structure, and fractal waffle cells are arranged on the bottom of the floating box.

Preferably, the upper floating cabin and the lower ballast are connected through a plurality of tendons, one end of each tendon is fixedly connected to a tendon upper connection point of the upper floating cabin, and the other end of each tendon is fixedly connected to a tendon lower connection point of the lower ballast.

Preferably, the upper floating cabin is connected with the lower ballast through six tendons, the angle between every two tendons of the upper floating cabin is sixty degrees, and the angle between every two tendons of the lower ballast is one hundred twenty degrees.

Preferably, a catenary fastener is fixedly connected to the upper buoyancy module, and the catenary fastener is used for keeping the platform in a mooring position.

Preferably, the catenary mooring element comprises three cables which are fixedly connected to the upper buoyancy module, and the included angle between each two cables is one hundred twenty degrees, and the diameter of each cable is 0.3 m.

Compared with the prior art, the invention has the beneficial effects that:

(1) the system is kept in a stretching state all the time under the action of the tension of the upper floating cabin and the gravity of the lower ballast tank through tension tendons connected with the upper floating cabin and the lower ballast tank, so that the relative stability of the system is ensured;

(2) the upper buoyancy tank and the lower ballast tank are connected through six tendons, the angle between every two tendons at the connection points of the upper buoyancy tank is 60 degrees, the angle between every two tendons at the three connection points of the lower ballast tank is 120 degrees, and the influence of different tendon connection distances on the platform stability is researched and shown in table 2. Under the action of external force such as sea waves, sea wind and the like, when the upper floating cabin is displaced, the pulling force of the lower ballast tank is transmitted to the upper floating cabin through the tension tendons connected with the lower ballast tank, so that the movement of the upper floating cabin is reduced, the speed of restoring the upper floating cabin to a balance position is increased, and the stability of the system is improved.

(3) The bottom of the upper floating cabin is provided with the waffle lattice with the fractal structure, the porous fractal structure is added, and in surging, heaving and surging freedom degrees of six freedom degrees, the maximum value of dynamic response and fluctuation amplitude are reduced after the porous fractal structure is added on the platform, so that the stability is obviously improved, and the practicability of the design is verified.

Drawings

FIG. 1 is a schematic structural diagram of a novel double-body floating type wind turbine platform with a fractal structure according to the invention;

FIG. 2 is a bar graph of different tendon lengths and different motion states of a platform of the novel double-body floating type wind turbine platform with the fractal structure;

FIG. 3 is a schematic diagram of multi-degree-of-freedom movement of a novel double-body floating type wind turbine platform with a fractal structure according to the invention;

FIG. 4 is an enlarged schematic view of the bottom of an upper floating cabin of the novel double-body floating type wind turbine platform with the fractal structure according to the invention;

fig. 5 is a platform time domain diagram of the novel double-body floating type wind turbine platform with the fractal structure.

The attached drawings are as follows: 1. a blade; 2. a generator compartment; 3. a support pillar; 5. a catenary tie; 6. an upper buoyancy module; 7. tendons and tendons; 8. ballasting the lower part; 10. tendon upper connection points; 11. the tendon lower junction; 12. a catenary connection point;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a novel double-body floating type wind turbine platform with a fractal structure comprises the following steps: the wind power generation system comprises blades 1, a generator cabin 2 fixedly connected with the blades 1, a support column 3 fixedly connected with the generator cabin 2, an upper floating cabin 6 fixedly connected with the support column 3 and a lower ballast 8 connected with the upper floating cabin 6 through tendons 7, wherein the lower ballast 8 is positioned under the upper floating cabin, the purpose of lowering the gravity center of the platform is achieved through the lower ballast 8, a restoring moment is provided, the platform system is enabled to keep a support tower vertical under the wind load effect, the normal operation of the wind power machine is guaranteed, the upper floating cabin 6 and the lower ballast 8 both adopt reinforced concrete structures, the production cost is reduced, the economical and practical performance is improved, and the tendons 7 are kept in a stretching state through the buoyancy of the upper floating cabin 6 and the gravity effect of the lower ballast 8; the upper floating cabin 6 comprises an upright post fixedly connected with the support post 3 and a floating box fixedly connected with the upright post, the floating box is of a hollow box structure, fractal waffle cells are arranged on the bottom of the floating box, the waffle cells can effectively improve the hydrodynamic characteristics of the platform, the stability of the platform is enhanced, the floating box provides buoyancy and restoring force to support a large-scale wind turbine on the upper portion, inertia is provided through the area of a large water line to keep the platform stable, the ballast 8 on the lower portion mainly plays a role in pressure, and the counterweight can be adjusted if necessary, the requirement of an ultra-large wind turbine with the area of a large water line to the stability is met under the condition of being suitable for the open sea, and the position of the ballast cabin is adjusted by adjusting the length of tendons to achieve the purpose of adjusting the draught depth of the platform. The platform has the characteristics of the large water line area of the Barge platform and the deep center of gravity of the Spar platform, the whole center of gravity is lower than the floating center, the preset tension is not required to be added to the tendons like a TLP (TLP) platform, and the center of gravity position of the platform can be adjusted by adjusting the lengths of the tendons, so that good hydrodynamic stability is achieved.

Furthermore, the upper floating cabin 6 and the lower ballast 8 are connected through a plurality of tendons 7, one end of each tendon 7 is fixedly connected to a tendon upper connection point 10 of the upper floating cabin 6, the other end of each tendon 7 is fixedly connected to a tendon lower connection point 11 of the lower ballast 8, the upper floating cabin 6 is connected with the lower ballast 8 through six tendons 7, the angle between every two tendons 7 of the upper floating cabin 6 is sixty degrees, the angle between two tendons 7 on the lower ballast 8 is one hundred twenty degrees, under the action of external force such as sea waves and sea winds, when the upper floating cabin is displaced, the pulling force of the lower ballast cabin is transmitted to the upper floating cabin through the tension tendons connected with the upper ballast cabin, so that the movement of the upper floating cabin is reduced, the speed of the upper floating cabin recovering to a balance position is increased, the stability of the system is improved, and the length of the tendons 7 can be properly adjusted according to the water depth and sea condition in practical application. The tendons are always in a stretching state under the action of the tension of the upper floating cabin and the gravity of the lower ballast cabin. When the upper floating cabin moves under the action of environmental load, the tendon transmits the tensile force of the lower ballast tank to the upper floating cabin, so that the motion response of the upper floating cabin is reduced, the time for the upper floating cabin to recover to a balance position is shortened, and the stability of the system is improved. In practical application, the water depth and sea condition can be adjusted properly.

Further, a catenary fastener 5 is fixedly connected to the upper buoyancy module 6, a catenary connection point 12 is arranged on the upper buoyancy module 6, the catenary fastener 5 is used for keeping the platform in mooring and positioning, the catenary fastener 5 comprises three cables, the cables are fixedly connected to the upper buoyancy module 6, an included angle between each two cables is one hundred twenty degrees, the diameter of each cable is 0.3m, the floating wind turbine moves to the maximum displacement position, gradually recovers to the balance position under the action of the tensile force of the catenary fastener 5, and finally is in a relatively stable state, and the method is shown in the following table 1:

TABLE 1 twin-hull platform catenary mooring force statistics

The catenary tie 5 described by table 1 is preferably three cables.

In the design stage, according to the environmental conditions of the service area of the platform, platforms with different shapes can be designed on the upper floating cabin so as to find the platform which is most suitable for different sea conditions, and researches show that the stability of the platform with the fractal porous structure is optimal.

In the installation stage, the length of the tendon 7 is shortened through a winch, so that the lower ballast tank is tightly attached to the bottom of the upper floating tank 6, and the novel double-body floating platform is transported to a service sea area by adopting a ship; after the ship arrives at a designated sea area, the horizontal state of the ship is changed into the vertical state through the upper floating cabin 6 and the lower ballast cabin 8, and then the tendons 7 are gradually released through a winch to enable the lower ballast cabin 8 to sink to a designated position. Compared with the original platform, the novel double-body floating type platform has smaller span, the catenary wire tying piece 5 has sufficient rigidity and is not easy to cause larger stress, and the upper floating cabin 6 with a fractal hole structure is adopted, so that the using amount of reinforced concrete, the production cost of the platform and the manufacturing and installation difficulty are reduced.

In the operation stage, due to the change of environmental conditions, compared with a traditional solid platform, the fractal porous structure at the bottom of the upper floating cabin 6 has the greatest influence on the degrees of freedom of surging, heaving and surging, so that the buffer effect of the upper floating cabin can be achieved, the stability of the wind turbine can be enhanced, the shaking of the wind turbine can be reduced, and the stable operation of the wind turbine can be firmly guaranteed.

Researches find that the surging, the pitching and the yawing motion have great influence on the stable operation and the power generation efficiency of the wind turbine. Compared with the original platform, the designed fractal porous structure floating body platform is obviously smaller in surging, pitching and yawing motion responses than the original platform, and the dynamic response statistical table and the time domain diagram of the original platform and the platform with the added porous structure are shown in the table 2 and the figure 5:

TABLE 2 original platform and platform dynamic response statistical table after adding porous structure

The number of devices and the scale of the processes described herein are intended to simplify the description of the invention, and applications, modifications and variations of the invention will be apparent to those skilled in the art.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.