Offshore foundation platform for relieving tendon fatigue load of tension leg and adjusting method

Abstract

The invention discloses an offshore foundation platform for relieving tendon fatigue load of a tension leg and an adjusting method. An offshore foundation platform for relieving tendon fatigue loads of tension legs comprises a platform body, a tension leg system and a driver. The platform body is provided with a cavity and floats on the sea surface; the tension leg system comprises a plurality of tension legs and a suction barrel, one end of each tension leg is connected with the platform body, and the suction barrel is arranged on the seabed and connected with the other end of each tension leg; the driver is provided with a water inlet and a water outlet, the driver is a water pump, the water inlet of the water pump is immersed below the liquid level of the seawater, the water outlet of the water pump is communicated with the cavity, and the driver is used for pumping the seawater into the cavity or pumping the seawater out of the cavity. The stability and safety of the platform can be improved, the fatigue load of the tendons of the tension legs can be relieved, and the service life of the tendons of the tension legs can be prolonged under the excitation of a complex marine environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power equipment, and in particular relates to an offshore foundation platform and an adjustment method for reducing fatigue load of tension hamstring tendons. Background Art

[0002] Nearly all offshore wind farms use traditional foundation-fixed wind turbines. However, compared with offshore wind energy resources, deep sea wind energy resources have greater potential and huge development potential. When the water depth exceeds 50 meters, the cost of traditional fixed foundations increases. Therefore, floating foundations have become an inevitable choice for economical and effective wind energy development in deep waters.

[0003] In the relevant technology, floating foundations can generally be divided into the following types according to the principle of maintaining stability: column foundation (Spar), semi-submersible foundation (Semi-Submersible), tension leg foundation (TLP) and barge foundation (Barge). Among them, the amplitude of the out-of-plane motion of the tension leg platform is very small, and it has the best motion performance among floating wind power platforms. It has been widely used in actual offshore oil and gas platforms. However, the stability of the tension leg platform is completely provided by the tendons as the mooring system. The tendon system, as a unique structure of the tension leg platform, can limit the movement of the platform and ensure the safety of the platform.

[0004] The sea conditions in deep sea areas are complex, with complex environmental excitations of different characteristics such as wind, waves, and currents. Even if the strength of the tendon system meets the requirements of the specifications, the tendons will suffer fatigue damage under the action of environmental alternating loads, affecting the overall stability of the structure and the safety of the platform, and affecting the power generation efficiency of the wind turbine. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention provides an offshore foundation platform that can reduce fatigue loads on tension hamstrings and improve the stability and safety of the platform.

[0007] An embodiment of the present invention provides an adjustment method.

[0008] The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to an embodiment of the present invention comprises:

[0009] A platform body, wherein the platform body has a cavity and the platform body floats on the sea surface;

[0010] A tension leg system, the tension leg system comprising a tension leg and a suction cylinder, the number of the tension legs is multiple, one end of the tension leg is connected to the platform body, and the suction cylinder is arranged on the seabed and connected to the other end of the tension leg;

[0011] A driver is provided with a water inlet and a water outlet, wherein the water outlet is communicated with the cavity, and the driver is used for pumping seawater into the cavity or pumping out seawater in the cavity.

[0012] The embodiments of the present invention can improve the stability and safety of the platform, reduce the fatigue load of the tension hamstring tendons, and increase the service life of the tension hamstring tendons under the stimulation of complex offshore environments.

[0013] In some embodiments, an exhaust valve is provided on the platform body, and the exhaust valve is located above the cavity and communicated with the cavity.

[0014] In some embodiments, the drive is a water pump.

[0015] In some embodiments, it also includes a first liquid level detection component and a controller. The first liquid level detection component is arranged on the outside of the platform body. The first liquid level detection component is used to obtain the height information of the seawater level. The controller is connected to the first liquid level detection component and the driver to control the action of the driver through the height information of the seawater level obtained by the first liquid level detection component.

[0016] In some embodiments, a second liquid level detection component is further included. The second liquid level detection component is disposed in the cavity, and the second liquid level detection component is used to detect the water level in the cavity.

[0017] In some embodiments, a tension detection component is further included, wherein the tension detection component is connected to the tension leg to detect the tension of the tension leg.

[0018] In some embodiments, it further includes offshore equipment, which is arranged on the platform body and is a wind power device or a photovoltaic device;

[0019] And / or, it also includes a plurality of buoys, which are evenly distributed along the circumference of the platform body, and the inner cavities of the buoys are connected to the cavity.

[0020] The adjustment method of the embodiment of the present invention is used for the adjustment method of the offshore foundation platform for reducing the fatigue load of the tension hamstring tendon described in any of the above embodiments, and the adjustment method comprises:

[0021] Obtain the height information of the seawater level in the area where the offshore foundation platform is located in real time;

[0022] Periodically calculate the average height of the seawater surface within the time range T;

[0023] Based on the average height, calculating the amount of water to be regulated in the cavity;

[0024] The driver is controlled to discharge the seawater in the cavity or pump the seawater into the cavity.

[0025] In some embodiments, the time range T is from 5 minutes to 20 minutes.

[0026] In some embodiments, the steps include:

[0027] Obtaining the tension on the tension leg, and determining whether the tension is greater than a first threshold;

[0028] If yes, water is injected into the cavity until the tension is less than a second threshold, wherein the second threshold is less than the first threshold;

[0029] If not, and the tension is less than a third threshold, the water in the cavity is pumped out until the tension is greater than a fourth threshold, wherein the third threshold is less than the fourth threshold, and the fourth threshold is less than the second threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of an offshore foundation platform for reducing fatigue loads on tension hamstring tendons according to an embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of an offshore foundation platform for reducing fatigue loads on tension hamstring tendons according to another embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the platform body of the embodiment of the present invention when the seawater level is high.

[0033] Figure 4 It is a schematic diagram of the platform body of the embodiment of the present invention when the seawater level is low.

[0034] Figure 5 is a flow chart of the adjustment method according to an embodiment of the present invention.

[0035] Reference numerals:

[0036] 1. Platform body; 11. Cavity; 12. Exhaust valve; 13. Float;

[0037] 21. Tension leg; 22. Suction cylinder;

[0038] 3. Driver;

[0039] 4. A first liquid level detection component;

[0040] 5. Wind power equipment;

[0041] 6. Sea water level. DETAILED DESCRIPTION

[0042] Embodiments of the present invention 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 invention, but should not be understood as limiting the present invention.

[0043] like Figure 1-Figure 4 As shown, the offshore foundation platform for reducing fatigue load of the tension leg 21 tendon according to an embodiment of the present invention includes a platform body 1, a tension leg 21 system and a drive 3.

[0044] The platform body 1 has a cavity 11, and the platform body 1 floats on the sea surface. The platform body 1 is used to support offshore equipment such as wind power equipment 5 and photovoltaic equipment. The buoyancy of the platform body 1 is greater than the gravity of itself and the equipment located above it, and part of the buoyancy needs to be borne by the tension leg 21 system; the tension leg 21 system includes a tension leg 21 and a suction cylinder 22, and the number of tension legs 21 is multiple. One end of the tension leg 21 is connected to the platform body 1, and the suction cylinder 22 is arranged on the seabed and connected to the other end of the tension leg 21; the driver 3 has a water inlet and a water outlet, wherein the driver 3 is a water pump, the water inlet of the water pump is immersed below the liquid surface of the seawater, and the water outlet of the water pump is connected to the cavity 11, and the driver 3 is used to pump seawater into the cavity 11 or pump out the seawater in the cavity 11.

[0045] The suction cylinder 22 is arranged on the seabed as a force point. The platform body 1 is pulled and fixed through the tension leg 21 to ensure the stability of the platform body 1. As the seawater level changes, the volume of the platform body 1 immersed below the seawater level will increase or decrease, thereby causing a large change in the tension on the tension leg 21. The embodiment of the present invention can adjust the tension on the tension leg 21 by adjusting the water carrying capacity in the cavity 11, thereby reducing the fatigue load of the tendons of the tension leg 21 under the stimulation of the complex offshore environment, thereby improving its service life and safety.

[0046] In some embodiments, the platform body 1 is provided with an exhaust valve 12, which is located above the cavity 11 and communicated with the cavity 11. When pumping seawater into the cavity 11, or pumping seawater out of the cavity 11, the exhaust valve 12 can adjust the internal pressure by inlet and outlet air to maintain pressure balance, and avoid the occurrence of positive pressure or negative pressure to affect the normal operation of the driver 3.

[0047] In some embodiments, the offshore foundation platform for reducing fatigue loads on the tendons of the tension leg 21 also includes a first liquid level detection component 4 and a controller. The first liquid level detection component 4 is a liquid level gauge. The first liquid level detection component 4 is disposed on the outside of the platform body 1. The first liquid level detection component 4 is used to obtain height information of the seawater level. The controller is connected to the first liquid level detection component 4 and the driver 3 to control the action of the driver 3 through the height information of the seawater level obtained by the first liquid level detection component 4.

[0048] The height information of the seawater level can be obtained in real time, and then the average height of the seawater level can be calculated periodically to further obtain the adjustment amount of the seawater in the cavity 11. The height information of the seawater level can also be obtained periodically, and the adjustment amount of the seawater in the cavity 11 can be calculated based on the obtained height information of the seawater level.

[0049] Furthermore, the offshore foundation platform for reducing fatigue loads on the tendons of the tension leg 21 further includes a second liquid level detection component, which is disposed in the cavity 11 and is used to detect the water level in the cavity 11. The second liquid level detection component is a liquid level gauge, which can detect the liquid level in the cavity 11, thereby calculating the change in the seawater in the cavity 11 and more accurately calculating the amount of water pumped by the driver 3.

[0050] Furthermore, the offshore foundation platform for reducing fatigue load of the tendon of the tension leg 21 further includes a tension detection component, which is connected to the tension leg 21 to detect the tension of the tension leg 21. The tension detection component is used to detect the tension of the tension leg 21. In the embodiment of the present invention, the first liquid level detection component 4, the second liquid level detection component and the tension detection component work together to collect and sum up the information of each, thereby realizing the control of the driver 3.

[0051] In the embodiment of the present invention, the offshore equipment arranged on the platform body 1 may be a wind power device 5 or a photovoltaic device, and of course may also be other offshore floating platforms.

[0052] Optionally, the embodiment of the present invention includes a plurality of buoys 13 , which are evenly distributed along the circumference of the platform body 1 . The buoys 13 may be arranged separately, or the inner cavity of the buoy 13 may be connected to the cavity 11 .

[0053] like Figure 5 As shown, the adjustment method of the embodiment of the present invention is used for the adjustment method of the offshore foundation platform for reducing the fatigue load of the tension hamstring tendon in any of the above embodiments, and the adjustment method includes:

[0054] S101. Acquire in real time the height information of the seawater level in the area where the offshore foundation platform is located.

[0055] S102, periodically calculating the average height of the seawater level within a time range T, the time range T being 5 minutes to 20 minutes, for example, the time range T being 5 minutes, 7 minutes, 8.5 minutes, 10 minutes, 15 minutes or 20 minutes, by adjusting the length of time T, the adjustment frequency of the buoy can be controlled, and it is ensured that the height change of the seawater level within a corresponding time period does not cause excessive fluctuation of the tension on the tension leg.

[0056] S103. Calculate the amount of water to be adjusted in the cavity based on the average height.

[0057] S104, controlling the driver to discharge the seawater in the cavity or pumping seawater into the cavity.

[0058] Of course, in order to further improve the accuracy of the adjustment, the displacement of the buoy can be further adjusted by the tension on the tension leg, which specifically includes the following steps:

[0059] S105: Obtain the tension on the tension leg, and determine whether the tension is greater than a first threshold.

[0060] S106: If yes, inject water into the cavity until the tension is less than a second threshold, wherein the second threshold is less than the first threshold.

[0061] S107, if not, and the tension is less than the third threshold, pump out the water in the cavity until the tension is greater than a fourth threshold, wherein the third threshold is less than the fourth threshold, and the fourth threshold is less than the second threshold.

[0062] It should be understood that the third threshold, the fourth threshold, the second threshold and the first threshold increase in sequence. Under normal circumstances, it is necessary to ensure that the tension of the tension leg is between the third threshold and the first threshold. When performing periodic adjustment, the tension of the tension leg needs to be adjusted to between the fourth threshold and the second threshold to ensure that it is within a reasonable range.

[0063] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An offshore foundation platform for reducing fatigue load of tension hamstring tendons, characterized in that: include: A platform body, wherein the platform body has a cavity and the platform body floats on the sea surface; A tension leg system, the tension leg system comprising a tension leg and a suction cylinder, the number of the tension legs is multiple, one end of the tension leg is connected to the platform body, and the suction cylinder is arranged on the seabed and connected to the other end of the tension leg; A driver is provided with a water inlet and a water outlet, wherein the water outlet is communicated with the cavity, and the driver is used for pumping seawater into the cavity or pumping out seawater in the cavity.

2. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 1, characterized in that: An exhaust valve is provided on the platform body, and the exhaust valve is located above the cavity and communicated with the cavity.

3. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 1, characterized in that: The driver is a water pump.

4. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 1, characterized in that: It also includes a first liquid level detection component and a controller. The first liquid level detection component is arranged on the outside of the platform body. The first liquid level detection component is used to obtain the height information of the seawater level. The controller is connected to the first liquid level detection component and the driver to control the action of the driver through the height information of the seawater level obtained by the first liquid level detection component.

5. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 4, characterized in that: It also includes a second liquid level detection component, which is arranged in the cavity and is used to detect the water level in the cavity.

6. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 1, characterized in that: It also includes a tension detection component, which is connected to the tension leg to detect the tension of the tension leg.

7. The offshore foundation platform for reducing fatigue load of tension hamstring tendons according to claim 1, characterized in that: It also includes offshore equipment, which is arranged on the platform body and is a wind power device or a photovoltaic device; And / or, it also includes a plurality of buoys, which are evenly distributed along the circumference of the platform body, and the inner cavities of the buoys are connected to the cavity.

8. A method of regulation, characterized in that: An adjustment method for an offshore foundation platform for reducing fatigue load of a tension hamstring tendon according to any one of claims 1 to 7, the adjustment method comprising: Obtain the height information of the seawater level in the area where the offshore foundation platform is located in real time; Periodically calculating the average height of the seawater surface within the time range T; Based on the average height, calculating the amount of water to be regulated in the cavity; The driver is controlled to discharge the seawater in the cavity or pump the seawater into the cavity.

9. The adjustment method according to claim 8, characterized in that: The time range T is 5 minutes to 20 minutes.

10. The adjustment method according to claim 8, characterized in that: Also includes the steps: Obtaining the tension on the tension leg, and determining whether the tension is greater than a first threshold; If yes, water is injected into the cavity until the tension is less than a second threshold, wherein the second threshold is less than the first threshold; If not, and the tension is less than a third threshold, the water in the cavity is pumped out until the tension is greater than a fourth threshold, wherein the third threshold is less than the fourth threshold, and the fourth threshold is less than the second threshold.

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