Motion suppression floating type wind power foundation structure based on liquid damping effect

Abstract

The invention discloses a motion suppression floating type wind power foundation structure based on a liquid damping effect. The motion suppression floating type wind power foundation structure comprises a floating ball, a connecting rod, an inclined strut and a damper base. The four floating balls are arranged in a square shape, the floating balls are connected through the connecting rods, the damper base is located on the central axis of the square defined by the four floating balls and located below the floating balls, and each floating ball is connected with the damper base through the corresponding inclined strut. The damper base is provided with a mounting seat for mounting a fan tower; a hollow channel is formed in the inclined strut; a crossed partition plate is arranged in the damper base and divides the interior of the damper base into four spaces with the same volume, a damping hole is formed in the partition plate between every two adjacent spaces, and each space is correspondingly communicated with the hollow channel of one inclined strut; and liquid is filled in the damper base and the hollow channel of the inclined strut. When the floating type foundation shakes, the liquid damping system can play a good role in damping force.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and in particular to a motion-suppressed floating wind power foundation structure based on liquid damping. Background Art

[0002] As the development and utilization of offshore wind power resources are approaching saturation, deep sea is becoming a new direction for global offshore wind power layout. Due to the large water depth in the open sea, floating offshore wind power foundations have more cost advantages than fixed foundations and are more feasible. They are the core technology supporting the development of deep sea wind resources. Under the influence of environmental loads such as wind, waves, and currents, floating wind power foundations will produce large swings in 6 degrees of freedom. First, this swing will affect the power generation efficiency of the wind turbine. Secondly, the increase in the movement of the overall structure of the floating wind power will significantly increase the motion load of the structure itself, affecting the safety of the overall structure of the floating wind power; finally, the repeated loads borne by the floating wind power structure and excessive movement will significantly reduce the fatigue life of the structure. Therefore, the motion suppression of floating wind power is an important issue related to the revenue and safety of deep sea wind power generation.

[0003] At present, there are many invention patent applications related to motion suppression of floating wind power foundation structures. From the perspective of motion suppression principles, there are many types of dampers, such as viscoelastic dampers, friction dampers, tuned mass dampers, and tuned liquid dampers. Among them, tuned liquid column dampers have been widely studied and applied due to their low operation and maintenance costs and efficient motion suppression effects. However, the current tuned liquid column dampers can usually only suppress movement in 1 to 2 directions, and most of them are installed on the top of the tower or nacelle. How to develop a floating wind power foundation structure based on liquid damping, make full use of the internal space of the floating foundation structure, and suppress the motion response of the floating wind power foundation structure from as many directions as possible is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a motion-suppressed floating wind power foundation structure based on liquid damping.

[0005] The present invention is achieved through the following technical solutions:

[0006] A motion-suppressed floating wind power foundation structure based on liquid damping, comprising a floating ball, a connecting rod, a diagonal brace, a damper base and a ballast weight block;

[0007] There are four floats, which are located in the same plane and arranged in a square. The floats are connected by connecting rods. The damper base is located on the central axis of the square surrounded by the four floats and below the floats. Each float and the damper base are connected by a diagonal brace. The ballast weight block is installed at the bottom of the damper base, and a mounting seat for installing a wind turbine tower is provided on the damper base.

[0008] The diagonal brace has a hollow channel inside; the damper base is provided with a cross partition to divide the inside of the damper base into four spaces of equal volume, a damping hole is provided on the partition between two adjacent spaces, and each space is connected to a hollow channel of the diagonal brace respectively; liquid is filled in the damper base and the hollow channel of the diagonal brace.

[0009] In the above technical solution, the damper base is cylindrical.

[0010] In the above technical solution, four mounting through holes are arranged on the outer wall of the damper base 4, each mounting through hole is connected to a space inside the damper base 4, and each mounting through hole is fixedly installed corresponding to the bottom end of a diagonal brace 3, so that the hollow channel of each diagonal brace 3 is connected to a space inside the damper base 4.

[0011] In the above technical solution, the damping holes can be in different forms such as square, circular, grid, etc.

[0012] In the above technical solution, the liquid level of the liquid in the diagonal support is 1 / 3 to 2 / 3 of the length of the diagonal support 3 .

[0013] In the above technical solution, a channel is also provided inside the float, and the channel inside the float is connected to the hollow channel of the diagonal support; an upper cover is provided at the top port of the channel of the float, and an openable and closable liquid injection port is provided on the upper cover.

[0014] In the above technical solution, a liquid pressure sensor is provided at the bottom of the damper base to characterize the height of the liquid column, so that the height of the liquid column can be adjusted according to actual needs to make the natural frequency of the liquid damping system as close as possible to the natural frequency of the structure.

[0015] In the above technical solution, the angle between the diagonal brace and the connecting rod is 45° to 90°.

[0016] In the above technical solution, anti-corrosion treatment is performed on the parts in contact with the liquid, such as the inside of the damper base, the inside of the partition and the inside of the diagonal support.

[0017] The advantages and beneficial effects of the present invention are:

[0018] (1) The motion-suppressed floating wind turbine foundation structure based on liquid damping of the present invention is made by using its own necessary foundation components (float, diagonal brace, base, etc.) by providing hollow channels, internal partitions, and damping holes in these foundation components, so as not to occupy extra space. At the same time, since the bottom space of the floating wind turbine foundation is relatively large, the size of the damper base and the height of the liquid column will not be limited by size.

[0019] (2) The motion suppression principle of the present invention is relatively simple and clear, and is not prone to failure. The maintenance of the damper is relatively simple, that is, ensuring that the structure does not leak and adjusting the height of the liquid column as needed, and the operating and maintenance costs are relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the motion-suppressed floating wind power foundation structure based on liquid damping of the present invention.

[0021] Figure 2 It is a schematic diagram of the top view of the structure of the motion-suppressed floating wind power foundation structure based on liquid damping of the present invention.

[0022] Figure 3 It is a schematic diagram of the mechanism of action of working condition 1 of the present invention.

[0023] Figure 4 It is a schematic diagram of the mechanism of action of working condition 2 of the present invention.

[0024] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0026] See attached Figure 1 -Attached Figure 2 A motion-suppressed floating wind power foundation structure based on liquid damping includes a floating ball 1, a connecting rod 2, a diagonal brace 3, a damper base 4 and a ballast weight block 5.

[0027] The number of the buoys 1 is preferably 4, and the 4 buoys are located in the same plane and arranged in a square; the buoys are connected by connecting rods 2; the damper base 4 is located on the central axis of the square surrounded by the 4 buoys and below the buoys, and each buoy 1 and the damper base 4 are connected by a diagonal brace 3; the ballast weight block 5 is installed at the bottom of the damper base 4, and a mounting seat for installing a wind turbine tower is provided on the damper base 4 to realize the installation of the wind turbine tower 7 on the floating wind power foundation.

[0028] The diagonal brace 3 is a hollow structure, that is, it has a hollow channel inside; the damper base 4 is cylindrical, and a cross partition 41 is arranged inside it to divide the inside of the damper base 4 into 4 spaces of equal volume, and a damping hole 42 is arranged on the partition between two adjacent spaces (the damping hole is a through hole, which can not only make the liquid in each space have a certain mutual flow, but also because the through hole is smaller than the area of ​​the partition, it will form resistance to the water flow, that is, play a damping role), and each space is connected to the hollow channel of a diagonal brace 3 (that is, 4 installation through holes are arranged on the outer wall of the damper base 4, each installation through hole is connected to a space inside the damper base 4, and each installation through hole is fixedly installed corresponding to the bottom end of a diagonal brace 3, so that the hollow channel of each diagonal brace 3 is connected to a space in the damper base 4). Further, the damping hole can be in different forms such as square, circular, and grid.

[0029] Liquid 6 is filled inside the damper base and the hollow channel of the diagonal brace 3. The filled liquid is not full, and sufficient non-liquid space is reserved to allow the liquid inside to flow during the floating vibration of the wind power foundation at sea, thereby forming a liquid damping system. Preferably, when the wind power foundation of the present invention is in a completely horizontal state, the height of the liquid level 61 in the diagonal brace 3 is 1 / 3 to 2 / 3 of the length of the diagonal brace 3.

[0030] Furthermore, the float 1 is also provided with a channel inside, and the channel inside the float 1 is connected with the hollow channel of the diagonal support 3 (i.e., the bottom port of the channel of the float 1 is connected with the top port of the hollow channel of the diagonal support 3). The top port of the channel of the float 1 is provided with an upper cover, and an openable and closable liquid injection port 8 is provided on the upper cover, through which liquid can be added to or sucked out of the inside of the base of the nipper and the inside of the hollow channel of the diagonal support 3 (i.e., the height of the liquid column can be adjusted). The channel is also provided inside the float 1, in addition to being able to conveniently add or suck out liquid, it can also extend / increase the activity space of the liquid (equivalent to extending the hollow channel space of the diagonal support 3), thereby increasing more liquid and liquid flow space.

[0031] The mechanism of action of the motion-suppressing floating wind power foundation structure of the present invention for suppressing the shaking and swaying of the wind power foundation is as follows:

[0032] 1. Mechanism of suppressing the shaking and swaying of wind turbine foundations

[0033] The floating wind power foundation will produce large shaking (rolling, pitching) and swaying (swaying, swaying) in the plane where the main wind direction is located. When the main wind direction and the minimum angle α (0<=α<=45) between the partitions of the motion-suppressed floating wind power foundation structure of the present invention are different, the flow direction of the liquid in the damper base is different.

[0034] Working condition 1: Working condition 1 is a special case. Figure 3 When the main wind direction and the minimum angle between the partition are small (such as 0<=α<10°), the damping holes k2 and k3 mainly play a damping role. During the shaking or swaying of the floating foundation, most of the liquid consumes energy through the damping holes k2 and k3 to play a damping effect.

[0035] Working condition 2: Working condition 2 is a general condition. Figure 4 When the main wind direction and the minimum angle between the partition plate are large (10°<α<=45°), the four damping holes are fully open, which can have a strong adaptability to shaking and swaying in different directions, and have a good inhibitory effect. At this time, the liquid mainly flows back and forth between the liquid column C1 and the liquid column C3, and at least needs to pass through the damping holes k1 and k2, or the damping holes k3 and k4, two damping holes, so as to improve the damping force and thus improve the motion suppression effect.

[0036] 2. Mechanism of suppressing bow sway of wind turbine foundation

[0037] The significant feature of the motion-suppressing floating wind power foundation structure of the present invention is that it can effectively suppress the bowing motion of the floating foundation. Since the wind force distribution is uneven, the floating wind power foundation and its upper structure are likely to produce bowing motion; when the floating foundation produces bowing motion, the liquid inside the present invention will generate a circulation in the opposite direction of the rotation of the floating foundation, and generate a damping force in the process of passing through the damping hole, thereby suppressing the bowing motion of the floating wind power foundation structure.

[0038] Furthermore, preferably, when the natural frequency of the liquid damping system is the same as the natural frequency of the floating wind power foundation structure, the damping effect is best. The main parameters of the liquid damping system include the size of the damper base, the height of the liquid column, and the size of the damping hole. Preferably, the frequency of the liquid damping system itself is adjusted by adjusting the height of the liquid column: a liquid inlet and a liquid outlet are provided on the upper part of the inclined column, and a liquid pressure sensor 9 is provided at the bottom of the damper base to characterize the height of the liquid column, so that the height of the liquid column can be adjusted according to actual needs (the liquid column height is adjusted by adding liquid or sucking out liquid through the injection port at the top of the float), so that the natural frequency of the liquid damping system is as close as possible to the natural frequency of the structure. The injection port is in a closed state when the damper is working normally.

[0039] Furthermore, the surfaces of the components related to the damping system for floating wind power, such as pipelines, liquid pressure sensors, partitions, chassis, liquid inlets, etc., should be coated with an anti-corrosion layer.

[0040] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A motion-suppressed floating wind power foundation structure based on liquid damping, characterized in that: It includes a floating ball, a connecting rod, a diagonal brace, a damper base and a ballast weight; There are four floats, which are located in the same plane and arranged in a square. The floats are connected by connecting rods. The damper base is located on the central axis of the square surrounded by the four floats and below the floats. Each float and the damper base are connected by a diagonal brace. The ballast weight block is installed at the bottom of the damper base, and a mounting seat for installing a wind turbine tower is provided on the damper base. The diagonal brace has a hollow channel inside; the damper base is provided with a cross partition to divide the inside of the damper base into four spaces of equal volume, a damping hole is provided on the partition between two adjacent spaces, and each space is connected to a hollow channel of the diagonal brace respectively; liquid is filled in the damper base and the hollow channel of the diagonal brace.

2. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The damper base is cylindrical.

3. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: Four mounting through holes are arranged on the outer wall of the damper base 4, each mounting through hole is connected to a space inside the damper base 4, and each mounting through hole is fixedly installed corresponding to the bottom end of a diagonal brace 3, so that the hollow channel of each diagonal brace 3 is connected to a space inside the damper base 4.

4. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The damping holes are square, circular or grid-shaped.

5. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The liquid level of the liquid in the diagonal support is 1 / 3 to 2 / 3 of the length of the diagonal support 3.

6. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The float is also provided with a channel inside, and the channel inside the float is connected with the hollow channel of the diagonal support; an upper cover is provided at the top port of the channel of the float, and an openable and closable liquid injection port is provided on the upper cover.

7. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: A liquid pressure sensor is provided at the bottom of the damper base to characterize the height of the liquid column, so that the height of the liquid column can be adjusted according to actual needs.

8. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The included angle between the diagonal brace and the connecting rod is 45° to 90°.

9. The motion-suppressed floating wind power foundation structure based on liquid damping according to claim 1, characterized in that: The inside of the damper base, the partition, the inside of the diagonal brace and other parts in contact with the liquid are treated with anti-corrosion.

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