Active variable-frequency damping device, floating-type foundation, and adjustment method

Abstract

An active variable-frequency damping device, a floating-type foundation, a wind turbine generator system and an adjustment method. The active variable-frequency damping device (100) comprises a friction pendulum assembly (1), a counterweight assembly (2) and a driving component, wherein the friction pendulum assembly (1) has a first component (11) and a second component (22), the second component (12) abuts against the first component (11), and the second component (12) can periodically swing on the first component (11); the counterweight assembly (2) has a cavity (21), the counterweight assembly (2) is connected to the second component (12), and at least part of the counterweight assembly (2) is located below a liquid level; and the driving component is in communication with the cavity (21), and the driving component is configured to pump a medium into the cavity (21) or pump the medium out from the cavity (21).

Description

Active variable frequency damping device, floating foundation and adjustment method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410223189.4 and application date February 28, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of offshore wind power technology, and in particular to an active variable frequency damping device, a floating foundation, and an adjustment method. Background Art

[0004] Offshore wind resources are abundant and adjacent to central electricity consumption areas. During the development of offshore wind power, when the water depth exceeds 50 meters, the cost of the foundation of traditional fixed wind turbines increases. Therefore, floating wind power becomes an inevitable choice for economical and efficient wind energy development in deep waters.

[0005] The sea conditions in deep sea areas are complex, with complex environmental stimuli such as wind, waves, and currents with different characteristics, which can easily cause the tilt angle of floating wind turbines to increase, which will not only increase the structural load of the wind turbines, but also affect the stability and power generation efficiency of the wind turbines. Summary of the Invention

[0006] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present application proposes an active variable frequency damping device that can actively adjust the swing frequency to achieve wide-band control, thereby being able to cope with complex external environmental conditions.

[0008] An embodiment of the present application provides a floating foundation.

[0009] An embodiment of the present application provides a wind turbine generator system.

[0010] The embodiments of the present application provide a floating foundation adjustment method.

[0011] The active variable frequency damping device of the embodiment of the present application includes:

[0012] A friction pendulum assembly, comprising a first component and a second component, wherein the second component abuts against the first component and can periodically swing on the first component;

[0013] a counterweight assembly having a chamber, the counterweight assembly being connected to the second component, at least a portion of the counterweight assembly being located below the liquid surface;

[0014] A driving component is communicated with the chamber, and the driving component is used to pump the medium into the chamber or to pump the medium out of the chamber.

[0015] The active variable frequency damping device of the embodiment of the present application can change the amount of medium in the inner cavity of the counterweight assembly by pumping the medium into the chamber or pumping the medium out of the chamber through the driving component. When the damping device is placed in water, the influence of the buoyancy on the counterweight assembly is changed, so that the swing frequency of the friction pendulum assembly can be actively adjusted, thereby achieving wide-band control and being able to cope with complex external environmental conditions.

[0016] In some embodiments, the chamber is a sealed chamber, and an exhaust pipe is connected to the chamber, one end of the exhaust pipe is connected to the chamber, and the other end of the exhaust pipe is connected to the atmosphere.

[0017] In some embodiments, the driving component includes a pump body having a first port and a second port, the first port being in communication with the chamber, and the second port being in communication with an external medium.

[0018] In some embodiments, the counterweight assembly includes a box body, the interior of the box body is hollow to form the chamber; and / or

[0019] The cross section of the counterweight assembly is circular or regular polygonal; and / or

[0020] The number of the friction pendulum assemblies is at least three, and the friction pendulum assemblies are evenly spaced along the circumference at the bottom of the counterweight assembly; and / or

[0021] A plurality of partitions are arranged in the chamber, and the plurality of partitions are used to divide the chamber into a plurality of sub-cavities. A plurality of through holes are provided on the partitions.

[0022] The floating foundation of the embodiment of the present application includes:

[0023] Basic platform;

[0024] In the active variable frequency damping device as described in any of the above embodiments, the first component in the active variable frequency damping device is connected to the base platform, and at least a portion of the active variable frequency damping device is located below the liquid surface.

[0025] In some embodiments, the base platform includes:

[0026] Multiple buoys, multiple buoys are arranged at intervals;

[0027] A frame is connected between the plurality of buoys, the frame has a first mounting portion, and the first component in the active variable frequency damping device is connected to the first mounting portion.

[0028] In some embodiments, the system further comprises a heave plate, wherein a plurality of the heave plates are disposed between adjacent buoys; and / or

[0029] It also includes a mooring system, which includes a plurality of mooring lines, one end of each mooring line is connected to the frame or the buoy, and the other end of each mooring line is connected to the seabed.

[0030] In some embodiments, the floating foundation further comprises:

[0031] A detection system, the detection system is used to obtain response characteristics of the basic platform;

[0032] A control system is connected to the detection system and the driving component, and is used to receive and process the response characteristics to control the action of the driving component.

[0033] The wind turbine generator set of the embodiment of the present application includes a floating foundation, a tower and a wind blade assembly as described in any of the above embodiments, wherein the tower is arranged on the floating foundation, and the wind blade assembly is arranged on the top of the tower.

[0034] The floating foundation adjustment method of the embodiment of the present application is used for balancing the floating foundation as described in any of the above embodiments or balancing the wind turbine as described in the above embodiments. The floating foundation adjustment method includes the following steps:

[0035] Obtaining response characteristics of the floating foundation under external environmental excitation;

[0036] Determining a preset adjustment frequency of the active variable frequency damping device;

[0037] Comparing the amount of medium in the counterweight assembly in the current state with the amount of medium in the counterweight assembly at a preset adjustment frequency, and obtaining a difference in the amount of medium;

[0038] The amount of medium in the chamber of the weight assembly is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic structural diagram of an active variable frequency damping device according to an embodiment of the present application.

[0040] FIG2 is a schematic structural diagram of a floating foundation according to an embodiment of the present application.

[0041] FIG3 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present application.

[0042] FIG4 is a flow chart of a floating foundation adjustment method according to an embodiment of the present application.

[0043] FIG5 is a structural diagram of a friction pendulum system according to an embodiment of the present application.

[0044] Figure numerals: 100, active variable frequency damping device; 200, floating foundation; 300, wind turbine; 1, friction pendulum assembly; 11, first component; 12, second component; 2, counterweight assembly; 21, chamber; 3, pump body; 4, exhaust pipe; 5, buoy; 6, frame; 7, heave plate; 8, mooring system; 9, tower; 10, blade assembly. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present application, but should not be understood as limiting the present application.

[0046] As shown in FIG1 , the active variable frequency damping device 100 according to an embodiment of the present application includes a friction pendulum assembly 1 and a counterweight assembly 2 .

[0047] The friction pendulum assembly 1 has a first component 11 and a second component 12, the second component 12 abuts against the first component 11 and can swing periodically on the first component 11. It should be understood that the first component 11 has a first friction surface, the second component 12 has a second friction surface, the second friction surface abuts against the first friction surface, and the second component 12 can swing periodically relative to the first component 11, thereby forming a friction pendulum tuned mass damper.

[0048] The counterweight assembly 2 has a chamber 21, which is connected to the second component 12, and at least part of the counterweight assembly 2 is located below the liquid surface. It should be understood that the counterweight assembly 2 is placed on the second component 12 as a mass block, and the counterweight assembly 2 and the second component 12 swing synchronously and periodically. By setting the chamber 21 in the counterweight assembly 2, liquid medium can be pumped into the chamber 21 to adjust the amount of medium in the chamber 21. The active variable frequency damping device 100 is placed in a liquid environment with buoyancy, and at least part of the counterweight assembly 2 is located below the liquid surface. For example, the active variable frequency damping device 100 is placed in seawater, which can adjust the influence of seawater on the counterweight assembly 2, and then the period of the active variable frequency damping device 100 can be adjusted. When facing a complex external environment, the frequency of the active variable frequency damping device 100 can be adjusted to improve the stability of the equipment equipped with the active variable frequency damping device 100. The active variable frequency damping device 100 can perform wide-band adjustment to adapt to more complex external environments.

[0049] The driving component in the embodiment of the present application is in communication with the chamber 21 and is used to pump a medium into the chamber 21 or to pump a medium out of the chamber 21. When the active variable frequency damping device 100 is placed in seawater, the medium may be seawater, and the driving component is used to pump the seawater into the chamber 21 or to pump the seawater out of the chamber 21.

[0050] That is to say, the active variable frequency damping device 100 of the embodiment of the present application can pump the medium into the chamber 21 or pump the medium out of the chamber 21 through the driving component, thereby changing the amount of medium in the inner cavity of the counterweight assembly 2. When the damping device is placed in water, the influence of the buoyancy of the water on the counterweight assembly 2 is changed, so that the swing frequency of the friction pendulum assembly 1 can be actively adjusted, wide-band control can be achieved, and it can cope with complex external environmental conditions.

[0051] In some embodiments, the chamber 21 is a sealed chamber 21, and an exhaust pipe 4 is connected to the chamber 21, one end of the exhaust pipe 4 is in communication with the chamber 21, and the other end of the exhaust pipe 4 is in communication with the atmosphere. It should be understood that the chamber 21 is a sealed chamber 21, and after the counterweight assembly 2 is placed in seawater, seawater can be prevented from directly entering the chamber 21 through the gap. By providing the exhaust pipe 4, the chamber 21 can be connected to the atmosphere, ensuring that the chamber 21 can still be connected to the atmosphere when the counterweight assembly 2 is placed in seawater, so that the medium in the chamber 21 will not be affected by the positive pressure environment or negative pressure environment in the chamber 21 when it is pumped out or pumped in.

[0052] In some embodiments, multiple partitions are arranged in the chamber 21, and the multiple partitions are used to divide the chamber 21 into multiple sub-cavities. Multiple through holes are set on the partitions. When the counterweight assembly 2 swings with the second component 12, the balance of the medium in the chamber 21 of the counterweight assembly 2 can be improved, and the medium in the chamber 21 of the counterweight assembly 2 can be prevented from affecting the swing frequency due to inertia and uneven distribution.

[0053] In some embodiments, the driving component includes a pump body 3 , and the pump body 3 has a first port and a second port. The first port is communicated with the chamber 21 , and the second port is communicated with an external medium.

[0054] It should be understood that the pump body 3 is a water pump, and the number of pump bodies 3 can be two, namely a first pump body 3 and a second pump body 3. The first pump body 3 is used to pump the medium into the chamber 21, and the second pump body 3 is used to pump the medium in the chamber 21 out of the chamber 21. For example, when the active variable frequency damping device 100 is placed in seawater, the water inlet of the first pump body 3 and the water outlet of the second pump body 3 are connected to the seawater, and the water outlet of the first pump body 3 and the water inlet of the second pump body 3 are connected to the chamber 21. When it is necessary to pump the medium into the chamber 21, the first pump body 3 is started, sucking the seawater and pumping it into the chamber 21. When it is necessary to pump the medium in the chamber 21 out, the second pump body 3 is started, discharging the seawater in the chamber 21 to the outside, and the water inlet of the second pump body 3 extends to the bottom of the chamber 21 through a pipe.

[0055] In some embodiments, the counterweight assembly 2 includes a box body, which is hollow inside to form a chamber 21. It should be understood that the counterweight assembly 2 is a box body structure, which can be made of a corrosion-resistant metal structure or a concrete structure, and the chamber 21 is formed inside the box body.

[0056] Furthermore, the cross section of the counterweight assembly 2 is circular or regular polygonal, that is, the counterweight assembly 2 has a relatively regular shape and the center of gravity is easy to determine, which facilitates installation and arrangement and improves stability.

[0057] Furthermore, there are at least three friction pendulum assemblies 1, which are evenly spaced along the circumference at the bottom of the counterweight assembly 2. When the counterweight assembly 2 is large, the structural stability of the counterweight assembly 2 and the friction pendulum assembly 1 can be improved by evenly arranging multiple friction pendulum assemblies 1 along the circumference at the bottom of the counterweight assembly 2.

[0058] As shown in Figures 1 and 2, the floating foundation 200 of an embodiment of the present application includes a base platform and an active variable frequency damping device 100 as in any of the above embodiments. The first component 11 in the active variable frequency damping device 100 is connected to the base platform, and at least a portion of the active variable frequency damping device 100 is located below the liquid surface.

[0059] It should be understood that the active variable frequency damping device 100 is arranged on the foundation platform to form a floating foundation 200. When the floating foundation 200 is placed in seawater, part of the active variable frequency damping device 100 or the entire device 100 is located below the liquid surface.

[0060] Furthermore, after the active variable frequency damping device 100 is arranged on the base platform, it is as close to the center of gravity of the base platform as possible, for example, the center of gravity of the active variable frequency damping device 100 and the center of gravity of the base platform coincide with each other, or the center of gravity of the active variable frequency damping device 100 and the center of gravity of the base platform coincide with each other and are collinear in the vertical direction.

[0061] In some embodiments, the base platform includes multiple pontoons 5 and a frame 6, the multiple pontoons 5 are arranged at intervals, the frame 6 is connected between the multiple pontoons 5, the frame 6 has a first mounting portion, and the first component 11 in the active variable frequency damping device 100 is connected to the first mounting portion.

[0062] It should be noted that the basic platform is composed of a combination of buoys 5 and a frame 6. Multiple buoys 5 are arranged in a circular or rectangular array. The frame 6 is arranged between the buoys 5 to form a stable integrated structure, which is convenient for arranging wind power equipment or other offshore equipment on the basic platform. The buoys 5 are used to provide buoyancy so that the basic platform can float on the sea.

[0063] A first mounting portion is provided on the frame 6 , which may be a mounting seat. The first component 11 in the active variable frequency damping device 100 is connected to the mounting seat. For example, the first component 11 and the mounting seat are fixed by bolts or welding.

[0064] Furthermore, the number of the buoys 5 is 3, 4, 6, 7 or 10.

[0065] In some embodiments, the first component 11 in the active variable frequency damping device 100 in the above embodiment is a lower support plate, and the second component 12 is an upper support plate. The lower support plate has a first spherical friction surface, and the upper support plate has a slider. The slider has a second spherical friction surface, and the second friction surface of the slider is in contact with the first friction surface of the lower support plate.

[0066] In some embodiments, the floating foundation 200 further includes a plurality of heave plates 7, which are disposed between adjacent buoys 5. The provision of the plurality of heave plates 7 can effectively suppress the movement of the floating foundation 200 and improve stability.

[0067] In some embodiments, a heave plate 7 is provided between adjacent buoys 5 , and the heave plate 7 is located at the bottom of the buoy 5 .

[0068] Floating foundation 200 also includes a mooring system 8, which comprises multiple mooring lines, one end of each of which is connected to the frame 6 or buoy 5, and the other end of each of which is connected to the seabed. These multiple mooring lines can be arranged circumferentially around floating foundation 200, improving foundation stability and wind resistance. They can also constrain the position and movement of floating foundation 200. In conjunction with the active variable frequency damping device 100, these mooring lines can be subjected to reduced stress, mitigating the impact loads on the mooring lines caused by the swing or excessive tilt of floating foundation 200, thereby preventing any impact on the strength and fatigue of the mooring lines.

[0069] In some embodiments, the mooring line is a steel cable or an iron chain, and the mooring line is connected to the seabed through a gravity anchor, a suction anchor, a grip anchor or a pile anchor.

[0070] In some embodiments, the floating foundation 200 further includes a detection system and a control system. The detection system is used to obtain response characteristics of the foundation platform. The control system is connected to the detection system and the driving component. The control system is used to receive and process the response characteristics to control the action of the driving component.

[0071] It should be understood that the detection system is used to obtain signals such as the inclination angle of the floating foundation 200, so that when the inclination exceeds a certain threshold, the frequency of the active variable frequency damping device 100 is adjusted by adjusting the intermediate mass of the counterweight assembly 2, thereby adapting to the current external environment, reducing the dynamic response of the floating foundation 200, and improving the stability of the system.

[0072] Alternatively, the acceleration response of the floating foundation can be measured using an acceleration sensor, and the frequency of the floating foundation's rocking mode can be identified through spectrum analysis (such as short-time Fourier transform or Hilbert-Huang transform). By adjusting the intermediate mass of the counterweight assembly 2, the frequency of the active variable frequency damping device 100 can be adjusted to adapt to the current external environment, reducing the dynamic response of the floating foundation 200 and improving system stability.

[0073] The control system is used to receive and process the response characteristics, calculate the amount of medium that needs to be adaptively adjusted by the active variable frequency damping device 100 based on the response characteristics, and then pump the medium into the chamber 21 or pump the medium out of the chamber 21 through the driving component to ensure that the frequency of the active variable frequency damping device 100 is adapted to the current external environment, better control the dynamic response of the floating foundation 200, and ensure the stability of the floating platform.

[0074] As shown in Figures 1-3, a wind turbine 300 according to an embodiment of the present application includes a floating foundation 200, a tower 9, and a blade assembly 10, as described in any of the aforementioned embodiments. The tower 9 is mounted on the floating foundation 200, and the blade assembly 10 is mounted on top of the tower 9. Arranging the tower 9 and blade assembly 10 on the floating foundation 200 to form the wind turbine 300 enables better development of offshore wind power in deepwater areas, adapts to the complex sea conditions in deepwater areas, and effectively responds to complex external environmental stimuli such as wind, waves, and currents.

[0075] As shown in FIG4 , the floating foundation 200 adjustment method of the embodiment of the present application is used for balancing the floating foundation 200 in any of the above embodiments or the wind turbine 300 in the above embodiments. The floating foundation 200 adjustment method includes the following steps:

[0076] S101. Obtain response characteristics of the floating foundation 200 under external environmental excitation.

[0077] Due to the complex sea conditions in deep sea areas, there are complex environmental excitations with different characteristics such as wind, waves, and currents, which can easily cause the tilt angle of the floating wind turbine 300 to increase. Therefore, the response characteristics of the floating foundation 200 in the current environment are determined by combining the impact of the wind, wave, and current levels on the floating foundation 200, or by obtaining other response characteristics of the floating foundation 200 and other information, and then adjusting the frequency of the active variable frequency damping device 100 according to the corresponding response characteristics, so as to more effectively adjust the stability of the floating foundation 200.

[0078] The response characteristic of the floating foundation 200 under external excitation can be the tilt angle of the floating foundation 200, and / or the acceleration response of the floating foundation can be measured by an acceleration sensor, and the frequency of the rocking mode of the floating foundation can be identified through spectrum analysis (such as short-time Fourier transform, Hilbert-Huang transform, etc.).

[0079] By acquiring the response characteristics under external environmental excitation in real time or periodically, the stability of the floating foundation 200 can be continuously monitored and adjusted, so that the floating foundation 200 can optimize its structural stability under the wide-band control of the active variable frequency damping device 100.

[0080] In some embodiments, after obtaining the inclination angle of the floating foundation, it can be determined whether the inclination angle of the floating foundation exceeds a preset threshold. If so, the active variable frequency damping device 100 is adjusted; if not, the active variable frequency damping device 100 may not be adjusted.

[0081] S102 : Determine a preset adjustment frequency of the active variable frequency damping device 100 .

[0082] It should be understood that different response characteristics of the floating foundation 200 may correspond to different frequencies of the active variable frequency damping device 100. For example, the inclination angle of the floating foundation 200 may be divided into multiple sections with a first threshold, a second threshold, a third threshold, or more thresholds. When the inclination angle of the floating foundation 200 is within different threshold ranges, the corresponding active variable frequency damping device 100 has a preset frequency, so that the floating foundation 200 can use the active variable frequency damping device 100 to reduce the dynamic response and improve stability under the response characteristics.

[0083] S103: Compare the current medium volume in the counterweight assembly 2 with the medium volume in the counterweight assembly 2 at the preset adjustment frequency, and obtain the medium volume difference. In other words, the medium volume in the cavity of the counterweight assembly 2 is adjusted to adjust the frequency of the active variable frequency damping device 100 by changing the effect of buoyancy on the counterweight assembly 2.

[0084] S104: Adjust the medium volume in the chamber 21 of the counterweight assembly 2. During the adjustment process, the driving component pumps the medium into the chamber 21 or pumps the medium out of the chamber 21. When the required adjustment medium volume difference is reached, the driving component stops.

[0085] The active variable frequency damping device of this application is placed in a floating foundation and can be used as a counterweight for the floating foundation. Furthermore, the active variable frequency damping device is placed in a liquid environment, and the density of the counterweight assembly can be adjusted to adjust the frequency of the active variable frequency damping device. When placed in a liquid environment, the active variable frequency damping device is equivalent to a friction pendulum system.

[0086] As shown in Figure 5, the friction pendulum system placed in a liquid environment can be simplified as a slider moving along a circular slide, where the radius of the slide and the radius of the arc surface at the bottom of the slider are both R, and the buoyancy is f b , the gravity is G, the upper positive pressure on the slider is W (W = Gf b ), f is the friction force, D is the horizontal displacement of the slider, and θ is the angle of rotation of the slider relative to the vertical symmetry axis of the slide.

[0087] According to the force balance of the slider, the moment of point O is taken as ΣMo=0, that is: FR cosθ-WD-fR=0 (1)

[0088] It can be seen that the horizontal force F of the friction pendulum can be expressed as the sum of the "restoring force" and the "friction force", that is:

[0089] When θ is very small, the above formula can be simplified to:

[0090] Where sgn is the sign function.

[0091] From this we can see that the stiffness of the friction pendulum is:

[0092] The equivalent stiffness of the friction pendulum can be expressed as:

[0093] Among them, D d is the design displacement of the friction pendulum.

[0094] When the upper counterweight assembly of the friction pendulum is placed in a liquid environment, the buoyancy it experiences is equal to the mass of the liquid displaced. The index η is defined as the ratio of the mass of the liquid displaced by the counterweight assembly (m1) to the mass of the counterweight assembly (m s ) ratio. A larger exponent η indicates a greater impact of buoyancy on the counterweight assembly. When the exponent η is zero, the buoyancy on the counterweight assembly is zero. When the exponent η approaches 1.0, the weight of the counterweight assembly is equal to the buoyancy, and the counterweight assembly is in a suspended state, with a period approaching infinity.

[0095] At this time, the period of the friction pendulum in the liquid environment can be expressed as:

[0096] From formula (8), we can see that the period of the friction pendulum in the liquid environment is related to the exponent η. Therefore, the period of the friction pendulum itself can be adjusted by adjusting the influence of the buoyancy in the liquid environment on the counterweight assembly.

[0097] The active variable frequency damping device of this application utilizes a friction pendulum as a support, with an adjustable mass counterweight assembly disposed on top. This application is applied in a buoyant environment (such as seawater), and by changing the effect of buoyancy on the counterweight assembly, the frequency of the TMD itself can be adjusted.

[0098] In practice, it can be applied in a variety of ways, such as by real-time monitoring of the inclination of the floating foundation. If the inclination exceeds the set threshold, the attitude of the floating foundation needs to be adjusted, and then the required adjustment water volume is calculated. The water pump is started to drain or inflate water, and the water volume in the counterweight assembly is adjusted to achieve the frequency adjustment of the active variable frequency damping device. The frequency of the active variable frequency damping device can also be adjusted according to the main frequency of the environmental excitation received by the floating wind turbine, so that the impact of the environmental excitation on the wind turbine is reduced.

[0099] This application proposes installing an active variable frequency damping device on a floating foundation. This device's main frequency can be adjusted in real time based on the foundation's response characteristics under external excitation, achieving broadband control. This can better cope with complex offshore environments, mitigate the dynamic response of wind turbine foundations under varying excitation conditions, and improve system stability.

[0100] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0101] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0102] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0103] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0104] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0105] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An active variable frequency damping device, comprising: A friction pendulum assembly, comprising a first component and a second component, wherein the second component abuts against the first component and can periodically swing on the first component; a counterweight assembly having a chamber, the counterweight assembly being connected to the second component, at least a portion of the counterweight assembly being located below the liquid surface; A driving component is communicated with the chamber, and the driving component is used to pump the medium into the chamber or to pump the medium out of the chamber.

2. The active variable frequency damping device according to claim 1, wherein: The chamber is a sealed chamber, and an exhaust pipe is connected to the chamber. One end of the exhaust pipe is communicated with the chamber, and the other end of the exhaust pipe is communicated with the atmosphere.

3. The active variable frequency damping device according to claim 1, wherein: The driving component includes a pump body having a first port and a second port. The first port is communicated with the chamber, and the second port is communicated with an external medium.

4. The active variable frequency damping device according to claim 1, wherein: The counterweight assembly includes a box body, the interior of the box body is hollow to form the chamber; and / or The cross section of the counterweight assembly is circular or regular polygonal; and / or The number of the friction pendulum assemblies is at least three, and the friction pendulum assemblies are evenly spaced along the circumference at the bottom of the counterweight assembly; and / or A plurality of partitions are arranged in the chamber, and the plurality of partitions are used to divide the chamber into a plurality of sub-cavities. A plurality of through holes are provided on the partitions.

5. A floating foundation comprising: Basic platform; The active variable frequency damping device according to any one of claims 1 to 4, wherein the first component in the active variable frequency damping device is connected to the base platform, and at least a portion of the active variable frequency damping device is located below the liquid surface.

6. The floating foundation according to claim 5, wherein: The basic platform includes: Multiple buoys, multiple buoys are arranged at intervals; A frame is connected between the plurality of buoys, the frame has a first mounting portion, and the first component in the active variable frequency damping device is connected to the first mounting portion.

7. The floating foundation according to claim 6, further comprising a heave plate, wherein a plurality of the heave plates are provided between adjacent buoys; and / or It also includes a mooring system, which includes a plurality of mooring lines, one end of each mooring line is connected to the frame or the buoy, and the other end of each mooring line is connected to the seabed.

8. The floating foundation according to any one of claims 5 to 7, wherein: The floating foundation further comprises: A detection system, the detection system is used to obtain response characteristics of the basic platform; A control system is connected to the detection system and the driving component, and is used to receive and process the response characteristics to control the action of the driving component.

9. A wind turbine generator system comprising a floating foundation, a tower and a wind blade assembly according to any one of claims 5 to 8, wherein the tower is arranged on the floating foundation, and the wind blade assembly is arranged on top of the tower.

10. A floating foundation adjustment method, used for balancing the floating foundation according to any one of claims 5 to 8 or balancing the wind turbine according to claim 9, the floating foundation adjustment method comprising the following steps: Obtaining response characteristics of the floating foundation under external environmental excitation; Determining a preset adjustment frequency of the active variable frequency damping device; Comparing the amount of medium in the counterweight assembly in the current state with the amount of medium in the counterweight assembly at a preset adjustment frequency, and obtaining a difference in the amount of medium; The amount of medium in the chamber of the weight assembly is adjusted.

Images