阅读说明：本技术 一种顺应型漂浮式风机基础和风机系统 (Compliance type floats formula fan basis and fan system ) 是由 李华祥 宋娇阳 顾爽 蒋勇 于 2021-01-25 设计创作，主要内容包括：本发明涉及一种顺应型漂浮式风机基础,包括：多个边浮筒、中间浮筒、轴承、系泊锚链；所述中间浮筒为中空的柱状结构,轴承套设在中间浮筒上,轴承的内圈与中间浮筒固定连接且无相对转动,轴承的外圈与中间浮筒相对转动；多个所述边浮筒中空的柱状结构,该些边浮筒沿着中间浮筒的周向均匀分布,每个边浮筒通过一桁架与所述轴承的外圈表面固定连接,该些边浮筒与桁架随着轴承外圈的转动随之转动；多个所述边浮筒的底部设有若干根系泊锚链。本发明可以有效释放风浪不同向造成的塔底与基础交界面的扭矩；提高结构抵抗载荷的效率,减少用钢量,简化建造运维的复杂程度,节约成本。(The invention relates to a compliant floating wind turbine foundation, comprising: a plurality of side buoys, middle buoys, bearings and mooring anchor chains; the middle floating barrel is of a hollow columnar structure, the bearing is sleeved on the middle floating barrel, the inner ring of the bearing is fixedly connected with the middle floating barrel and does not rotate relatively, and the outer ring of the bearing rotates relatively to the middle floating barrel; the side buoys are uniformly distributed along the circumferential direction of the middle buoy, each side buoy is fixedly connected with the surface of the outer ring of the bearing through a truss, and the side buoys and the truss rotate along with the rotation of the outer ring of the bearing; and a plurality of mooring anchor chains are arranged at the bottoms of the side buoys. The invention can effectively release the torque of the interface between the tower bottom and the foundation caused by different directions of wind waves; the efficiency of the structure resistance load is improved, reduce with the steel volume, simplify the complexity of building fortune dimension, practice thrift the cost.)

1. A compliant floating wind turbine foundation comprising: a plurality of side buoys (3), a middle buoy (4) and a bearing (5);

the middle buoy (4) is of a hollow columnar structure, the bearing (5) is sleeved on the middle buoy (4), the inner ring of the bearing (5) is fixedly connected with the middle buoy and does not rotate relatively, and the outer ring of the bearing (5) rotates relatively to the middle buoy (4);

the side buoys (3) are distributed along the circumferential direction of the middle buoy (4), each side buoy (3) is fixedly connected with the surface of the outer ring of the bearing (5), and the side buoys (3) rotate along with the rotation of the outer ring of the bearing (5).

2. A floating wind turbine foundation according to claim 1, characterised in that each of said side pontoons (3) is fixedly connected to the outer circumferential surface of said bearing (5) by means of a truss (6).

3. A floating wind turbine foundation according to claim 1 wherein the side pontoons (3) are of hollow cylindrical construction.

4. A floating wind turbine foundation according to claim 3 wherein the edge pontoons (3) have compartments within them, each compartment being an independent space.

5. A floating wind turbine foundation according to claim 4 wherein the compartments are aligned vertically or horizontally.

6. A floating wind turbine foundation according to claim 1, characterised in that the number of side pontoons (3) is at least 4.

7. The floating wind turbine foundation of claim 1, wherein the middle pontoon (4) and the side pontoons (3) are made of steel and have a cylindrical structure.

8. The floating wind turbine foundation according to claim 2, wherein two ends of the truss (6) are fixedly connected with the side buoy (3) and the bearing (5) respectively in a welding manner.

9. A floating wind turbine foundation according to claim 2 wherein the truss (6) is constructed of steel rods.

10. Floating wind turbine foundation according to claim 1, characterised in that the bearing (5) is a compliant swivel bearing and that the intermediate buoy (4) is connected to the bearing (5) in a prestressed hoop-tight manner, i.e. when the mutual rotational moment between the bearing (5) and the intermediate buoy (4) is above a certain set value, a relative rotational movement is possible between the two.

11. A floating wind turbine foundation according to claim 1, characterised in that the bottom of each side buoy (3) is provided with at least one mooring anchor chain (8).

12. A compliant floating wind turbine system comprising a wind turbine foundation, a tower (2), a wind turbine (1) according to any of claims 1-11; the top of the middle buoy (4) of the fan foundation is fixedly connected with the bottom of the tower drum (2), the top of the tower drum (2) is provided with a fan (1), and the side buoy (3) of the fan foundation can rotate relative to the tower drum (2) through a bearing (5).

Technical Field

The invention relates to the field of offshore wind power generation, in particular to a compliant floating type fan foundation.

Background

With the increasing development of offshore wind power by human beings, offshore wind resources are becoming to the greatest extent, and deep open sea is the key point of offshore wind power development at present and in the future. For deep open sea, floating blowers are almost the only technical choice. Several typical existing floating wind turbine foundations mainly include Tension Leg (TLP), Spar (Spar), and SEMI-Submersible (SEMI). The SEMI-submersible foundation (SEMI) has the advantages of wide adaptive water depth range, convenience in construction and transportation, high flexibility in installation and anchoring and strong universality, and is generally considered to be an important floating foundation form for developing offshore wind power resources.

The semi-submersible fan floating foundation mainly comprises upright columns, cross beams, inclined struts, a water pressing plate, a mooring system and an anchoring foundation. Currently, Europe and America have designed a plurality of semi-submersible floating type fan foundations. For example:

the Tri-float is an offshore floating wind turbine foundation scheme designed and introduced by gusto msc corporation, and is a three-column semi-submersible structure, and a wind turbine tower is positioned at the center of the top of a floating body structure.

OC4-DeepCwind is a basic concept of design of semi-submersible floating wind turbine concept proposed by American renewable energy laboratory. Every limit flotation pontoon of this scheme comprises last flotation pontoon and lower flotation pontoon, and lower flotation pontoon not only provides buoyancy, plays vertical system moreover and swings the board effect, and the tower section of thick bamboo links to each other with middle flotation pontoon, and flotation pontoon and limit flotation pontoon in the middle of stull and bracing are connected.

American PPI company provides a semi-submersible type floating fan foundation windFloat, which is a semi-submersible structure consisting of three upright columns, wherein a tower cylinder is connected with one of the upright columns, and the upright columns are connected through cross braces and inclined braces. Water is drained and pressurized between the upright columns through the active ballast system so as to compensate fan movement caused by changes of wind speed and direction.

IDEOL company has designed a kind of semi-submerged type floating fan foundation Damping-pool with Damping pool, this type of foundation is made up of buoy and three-point mooring system of returning the style of calligraphy, mount the fan pylon in a side of the foundation of returning the style of calligraphy, other three sides are the structure of the buoy, the posture in the fan operation process can be controlled through the internal ballast of the structure of the buoy and mooring anchor chain system.

First, for offshore floating wind turbine foundation systems, the load at the tower bottom and foundation interface has always been a concern for designers. The load at the junction of the tower bottom and the foundation is mainly represented by bending moment, torque and axial load. The torque is mainly caused by severe environmental conditions, different wind and wave directions and yawing. How to make the structure at the interface of the tower bottom and the foundation bear the corresponding load is always the design key point. The existing foundation forms meet the load requirement by increasing the structural size or adding an additional reinforcing structure. The existing design mode has the following problems:

1) the conventional methods of structural size increase and structural reinforcement are not efficient at resisting torque loads;

2) the increase in the thickness or size of the structure causes an increase in the amount of steel used, leading to an increase in cost;

3) the additional structural reinforcement makes the structure more complex, increasing the difficulty of construction and operation and maintenance.

Secondly, with the marine floating foundation developing to farther sea area, environmental condition is increasingly abominable, and this can cause very big influence to current floating fan foundation system:

1) the increase of the size of the wind wave load and the increase of the included angle of the wind wave load can cause the increase of the torque at the tower bottom and the basic section, and the problem that how to resist the load at the position is necessary to be faced by a designer;

2) the lower wave load causes the floating foundation to move in response to the wave direction, and this movement of the foundation causes the upper fan to move. Because the wind waves are in different directions, the movement forms an included angle with the windward side of the fan, the generating efficiency of the fan is influenced, and larger pressure is brought to a control and yaw system.

Finally, with the development trend of flat-price internet surfing, the fan is continuously developed towards a larger size, the increase of the size and the weight of the fan can cause the increase of the load of the floating fan system, and how to improve the efficiency of the structure for resisting the load is particularly important in the design.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a compliant floating wind turbine foundation, which comprises: a plurality of side buoys, a middle buoy and a bearing;

the middle floating drum is of a hollow columnar structure, the bearing is sleeved on the middle floating drum, the inner ring of the bearing is fixedly connected with the middle floating drum and does not rotate relatively, and the outer ring of the bearing is connected with the middle floating drum and can rotate relatively;

the side buoys are distributed along the circumferential direction of the middle buoy, each side buoy is fixedly connected with the surface of the outer ring of the bearing, and the side buoys rotate along with the rotation of the outer ring of the bearing.

Preferably, each side pontoon is a hollow cylindrical structure;

preferably, each of the side pontoons is fixedly connected to the outer ring surface of the bearing through a truss, and the side pontoons rotate along with the rotation of the outer ring of the bearing through the truss.

Preferably, a plurality of compartments arranged in the vertical direction or the horizontal direction are arranged in the side pontoons, and the compartments are independent spaces.

Preferably, the number of side pontoons is at least 4.

Preferably, the middle buoy and the side buoys are made of steel and have cylindrical structures.

Preferably, both ends of each truss are fixedly connected with the side buoy and the bearing respectively in a welding mode.

Preferably, the truss is composed of a plurality of steel rods.

Preferably, the bearing is a compliant rotary bearing, and the connection between the intermediate buoy and the bearing is a prestressed hoop-tight manner, that is, when the mutual rotation torque between the bearing and the intermediate buoy is greater than a certain set value, the bearing and the intermediate buoy can generate relative rotation movement.

Preferably, the bottom of each side buoy is provided with at least one mooring anchor chain.

Further, the invention provides a compliant floating type fan system, which comprises the fan foundation, a tower and a fan; the top of the middle buoy of the fan foundation is fixedly connected with the bottom of the tower barrel, the top of the tower barrel is provided with a fan, and the side buoy of the fan foundation can rotate relative to the tower barrel through a bearing.

The invention has the following beneficial effects:

1. the torque of the interface between the tower bottom and the foundation caused by different wind waves can be effectively released;

2. the movement of the fan following the foundation caused by different directions of wind waves is reduced, and the stability of the generated power of the fan is improved;

3. the efficiency of the structure resisting load can be improved, the steel consumption is reduced, the complexity of construction, operation and maintenance is simplified, and the cost is saved.

Particularly, the floating wind driven generator system has more outstanding advantages for larger floating wind driven generator systems with more complex environmental conditions.

Drawings

FIG. 1 is a schematic diagram of the general structure of a compliant floating wind turbine foundation of the present invention;

FIG. 2 is a partial block diagram of a compliant floating wind turbine foundation of the present invention.

Description of reference numerals:

fan 1

Tower drum 2

Side pontoon 3

Intermediate buoy 4

Bearing 5

Truss 6

Horizontal plane 7

Mooring anchor chain 8

Seabed 9

Detailed Description

The following provides a further detailed description of a compliant floating wind turbine foundation according to the present invention with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

As shown in fig. 1-2, a compliant floating wind turbine foundation and wind turbine system are provided, in which the wind turbine foundation includes: 4 side buoys 3, a middle buoy 4, a bearing 5 and a mooring anchor chain 8;

the middle buoy 4 is of a hollow columnar structure, the bearing 5 is sleeved on the middle buoy 4, the inner ring of the bearing 5 is fixedly connected with the middle buoy 4 and does not rotate relatively, and the outer ring of the bearing 5 is connected with the middle buoy 4 and can rotate relatively; the bearing 5 is a compliant rotary bearing, and the connection mode of the intermediate buoy 4 and the bearing 5 is a prestressed tightening mode, that is, when the mutual rotation torque between the bearing 5 and the intermediate buoy 4 is greater than a certain set value, the bearing 5 and the intermediate buoy can generate relative rotation movement.

The side pontoons are 3 hollow columnar structures, the side pontoons 3 are distributed along the circumferential direction of the middle pontoon 4, each side pontoon 3 is fixedly connected with the surface of the outer ring of the bearing 5 through a truss 6, and the side pontoons 3 and the truss 6 rotate along with the rotation of the outer ring of the bearing 5.

The middle buoy 4 and each side buoy 3 float on the horizontal plane 7, and the whole fan foundation floats on the horizontal plane 7. The bottom of each side buoy 3 is provided with a mooring anchor chain 8, and the mooring anchor chain 8 is connected with the seabed 9 and used for fixing the fan foundation above the seabed 9.

Further, the top of the fan foundation is fixedly connected with the bottom of the tower drum 2, specifically, the top of the middle buoy 4 of the fan foundation is fixedly connected with the tower drum 2 through a flange, the top of the tower drum 2 is fixedly provided with a fan 1, and the fan foundation, the tower drum 2 and the fan 1 form a complete marine floating type fan system. The middle buoy 4 not only provides buoyancy for the fan system, but also can directly bear the load transferred by the upper tower 2.

Because the relative rotary motion can be realized between the side buoy 3 of the wind turbine foundation and the tower drum 2, the overlarge torque between the bottom of the tower drum 2 and the horizontal section of the wind turbine foundation caused by the inconsistent wind and wave directions can be released; on the other hand, when the stormy waves are not in the same direction, because relative rotary motion can be realized between the side buoy 3 of the fan foundation and the tower drum 2, and the torque generated in the stormy waves in the different direction is released by the rotary motion of the side buoy 3, the tower drum 2 and the fan 1 cannot rotate along with the floating fan foundation, so that the stability of the generating efficiency of the fan 1 in a severe environment is improved, and meanwhile, the pressure of a control system and a yaw system can be reduced.

Furthermore, a plurality of compartments can be arranged in the side buoy 3 along the vertical direction or the horizontal direction, each compartment is an independent space, and the design of the compartments can effectively prevent the overturning of the fan foundation caused by the water leakage problem. The side buoys 3 can also be used as ballast water tanks for adjusting the buoyancy of the foundation, and the ballast weight is changed by controlling the water inlet and outlet amount of the water tanks, so that the side buoys 3 not only can provide buoyancy for the fan system, but also can provide anti-overturning moment for the fan system.

Preferably, the middle buoy 4 and the side buoys 3 are made of steel, and the structures of the middle buoy and the side buoys are cylindrical structures.

Preferably, two ends of each truss 6 are fixedly connected with the outer ring surfaces of the side buoy 3 and the bearing 5 respectively in a welding mode.

Preferably, the truss 6 is made up of several steel rods.

In conclusion, the invention can effectively release the torque of the interface between the tower bottom and the foundation caused by different directions of wind waves; the movement of the fan following the foundation caused by different directions of wind waves is reduced, and the stability of the generated power of the fan is improved; the efficiency of the structure for resisting load can be improved, the steel consumption is reduced, the complexity of construction, operation and maintenance is simplified, and the cost is saved; the floating wind driven generator system has more outstanding advantages for larger floating wind driven generator systems with more complex environmental conditions.

Finally, the fan foundation structure adopts a foundation in a four-side buoy form, and the bulkhead is arranged in the side buoy, so that the problem of structural instability when the buoy is damaged in the traditional three-buoy structure is solved. While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.