A mooring system for offshore floating wind turbine generator foundation and method of operation thereof

Abstract

The application discloses a sea floating type wind turbine generator foundation mooring system, which comprises an anchoring foundation, a mooring system, a floating body foundation and an upper wind turbine; the mooring system comprises a bottom section mooring chain, an intermediate mooring cable and an upper section mooring chain; the length of the intermediate mooring cable is greater than the straight line connecting distance between the bottom section mooring chain and the upper section mooring chain, and the tension adjustment of the intermediate mooring cable is realized through the buoyancy effect, so as to realize the effective connection between the anchoring foundation and the floating body foundation; the anchoring foundation is connected with the bottom section mooring chain of the mooring system; the bottom section mooring chain is connected with the intermediate mooring cable; the intermediate mooring cable is connected with the upper section mooring chain; the upper section mooring chain is connected with the floating body foundation; the upper wind turbine is installed on the upper foundation; the whole mooring system does not use high-cost equipment such as tensioners, and the relatively expensive tensioner product cost and the cost of large ship machine equipment used for using the tensioner are saved through the buoyancy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of offshore wind turbine mooring technology, in particular to a kind of offshore floating wind turbine foundation mooring system and working method thereof. BACKGROUND

[0002] With the continuous development of offshore wind energy resources, offshore wind energy resources are gradually exhausted, and the development of deep sea wind power has become an inevitable trend of offshore wind power development. With the increasing development of water depth, the original fixed wind power development technology cannot meet the requirements of site water depth. However, due to the high development cost of floating wind power technology, the development process is relatively slow, and low-cost development technology is urgently needed. As an important part of the whole machine, the development cost of mooring system is crucial to the overall cost.

[0003] There are various types of floating foundations, but their mooring methods can be roughly divided into catenary type, tension type and semi-tension type. The present application mainly aims at the catenary type mooring method, which aims to reduce the development cost of mooring system by innovating the mooring method, and thus reduce the overall cost of floating wind turbine foundation. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a kind of offshore floating wind turbine foundation mooring system and working method thereof, which can adjust the tension of mooring cable through floating cylinder to realize the connection between floating body foundation and anchoring foundation without using tensioner.

[0005] The technical scheme of the present application is as follows:

[0006] A kind of offshore floating wind turbine foundation mooring system, including anchoring foundation, mooring system, floating body foundation and upper wind turbine;

[0007] The mooring system includes bottom section mooring chain, intermediate mooring cable and upper section mooring chain;The length of the intermediate mooring cable is greater than the straight line connection distance between the bottom section mooring chain and the upper section mooring chain, and the tension adjustment of the intermediate mooring cable is realized by the action of buoyancy, thereby realizing the effective connection between the anchoring foundation and the floating body foundation;

[0008] The anchoring foundation is connected with the bottom section mooring chain of the mooring system;The bottom section mooring chain is connected with the intermediate mooring cable;The intermediate mooring cable is connected with the upper section mooring chain;The upper section mooring chain is connected with the floating body foundation;The upper wind turbine is installed on the upper foundation.

[0009] Further, a kind of offshore floating wind turbine foundation mooring system, the intermediate mooring cable includes mooring cable and floating cylinder, one end of the mooring cable is connected with the upper section mooring chain, the other end is connected with the bottom section mooring chain, and the floating cylinder is arranged at the intermediate position of the mooring cable.

[0010] The pontoon is connected with the mooring cable through the connecting eye plate, and a tension sensor is installed at the connection position of the pontoon and the connecting eye plate, so that the tension below the pontoon can be monitored in real time.

[0011] Further, the offshore floating wind turbine foundation mooring system comprises a floating cabin, a spring buffer cabin and a T-shaped pull plate, the floating cabin is arranged above the spring buffer cabin, the T-shaped pull plate is arranged in the spring buffer cabin in a matched mode, and the vertical connecting plate of the T-shaped pull plate penetrates through the bottom surface of the spring buffer cabin, and the bottom thereof is fixedly connected with the connecting eye plate.

[0012] Further, the offshore floating wind turbine foundation mooring system comprises a spring buffer cabin, a spring support cabin and a spring, the spring is fixedly arranged in the spring support cabin and located at a position between the horizontal support plate of the T-shaped pull plate and the bottom surface of the spring buffer cabin.

[0013] Further, the offshore floating wind turbine foundation mooring system comprises a floating cabin, a support frame and a gas port, the gas bag is arranged in the support frame, the gas port is located at the top of the gas bag, and the internal and external pressures of the gas bag support frame are equal.

[0014] Further, the offshore floating wind turbine foundation mooring system comprises a floating cabin, a support frame and a gas port, the gas bag is arranged in the support frame, the gas port is located at the top of the gas bag, and the internal and external pressures of the gas bag support frame are equal.

[0015] A working method of the offshore floating wind turbine foundation mooring system comprises the following steps.

[0016] Step 1) installation of the anchor foundation end mooring system: install the pontoon in an uninflated state on the mooring cable, connect the mooring cable with the bottom section mooring chain, install the end of the bottom section mooring chain on the anchor foundation, install the anchor foundation on the seabed, and adjust the mooring cable and the bottom section mooring chain to be on the in-place path.

[0017] Step 2) installation of the floating foundation end mooring system: install the upper section mooring chain on the floating foundation with the upper wind turbine at the dock, tow the floating foundation to the offshore position, connect the upper section mooring chain with the upper end of the mooring cable on the seabed one by one, inflate the pontoon on the mooring cable and observe the tension change of the tension sensor at the upper end, stop inflating when the tension reaches the design value, complete the above inflation operation one by one and recover the equipment.

[0018] Further, the working method of the offshore floating wind turbine foundation mooring system, the tension sensor is built in the bolt connecting the connecting eye plate and the pontoon, the bolt is pre-installed on the connecting eye plate, and the final connection is performed by the underwater robot.

[0019] Further, a working method of the offshore floating wind turbine foundation mooring system, after the pontoon is installed on the mooring cable, the underwater robot carries the inflation pipeline and connects the air port with the air bag, and starts the inflation equipment on the ship to inflate the pontoon, and after completion, the underwater robot disconnects the air port from the inflation pipeline.

[0020] Further, a working method of the offshore floating wind turbine foundation mooring system, the pontoon before inflation, the density is close to water, which is convenient for installation in water; the pontoon after installation and inflation in place can provide the required tension of the mooring system; the pontoon in the working state in place can provide constant buoyancy to ensure the posture of each mooring line, when the floating body deviates from the balance position under the action of external environmental force, the posture of the mooring line is adjusted through the heave of the pontoon, to ensure that the floating body foundation makes periodic oscillation motion in the balance position; the spring buffer cabin arranged in the pontoon is used to cope with the instantaneous impact load in the oscillation motion.

[0021] The beneficial effects of the present application are as follows:

[0022] 1) The entire mooring system does not use high-cost equipment such as tensioners, and cleverly uses buoyancy to pull and tension the mooring system, saving the cost of expensive tensioner products and the cost of large ship machine equipment used by the tensioner.

[0023] 2) Low operation and maintenance cost, adjust the tension of the mooring system, mainly adjust the air injection of the reserved air bag air port, and then effectively pull and tension the mooring system.

[0024] 3) The pontoon is provided with a buoyancy cabin and a spring buffer cabin, the buoyancy cabin is used to adjust the buoyancy of the pontoon, and the spring buffer cabin can cope with the impact of external force, effectively improving the stability of the mooring system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a mooring cable slack state structure diagram of the present application;

[0026] Figure 2 It is a mooring cable tension state structure diagram of the present application;

[0027] Figure 3 It is an intermediate mooring cable structure diagram of the present application;

[0028] Figure 4 It is a pontoon external component structure diagram of the present application;

[0029] Figure 5 It is a pontoon internal component structure diagram of the present application;

[0030] Figure 6 It is a pontoon inflation and deflation state diagram of the present application;

[0031] Figure 7 Figure 1 is a schematic diagram of the floating buoy installation structure of the present application;

[0032] Figure 8 Figure 2 is a schematic diagram of the floating buoy impact load buffering state of the present application;

[0033] Figure 9 Figure 3 is a schematic diagram of the floating body balance position state of the present application;

[0034] Figure 10 Figure 4 is a schematic diagram of the floating body limit position 1 state of the present application;

[0035] Figure 11 Figure 5 is a schematic diagram of the floating body limit position 2 state of the present application;

[0036] Figure 1 is a schematic diagram of the floating buoy installation structure of the present application; DETAILED DESCRIPTION

[0037] The present application is further described below in conjunction with the accompanying drawings.

[0038] As shown in Figure 1, a floating offshore wind turbine foundation mooring system mainly consists of four parts: anchoring foundation 1, mooring system, floating body foundation 6 and upper wind turbine 7. Figures 1-2 The mooring system and anchoring foundation are provided with six sets in total, each of which mainly consists of bottom mooring chain 2, intermediate mooring cable 3 and upper mooring chain 5.

[0039] The intermediate mooring cable 3 mainly consists of mooring cable 301 and floating buoy 4.

[0040] The anchoring foundation 1 is located at the end of the entire floating system and is connected with the bottom mooring chain 2 of the mooring system; the bottom mooring chain 2 is connected with the intermediate mooring cable 3; the intermediate mooring cable 3 is connected with the upper mooring chain 5; the upper mooring chain 5 is connected with the floating body foundation 6; the floating body foundation 6 is installed with the upper wind turbine 7, which includes the wind turbine tower and the upper main engine 7.

[0041] In this embodiment, as shown in Figure 1, a floating offshore wind turbine foundation mooring system mainly consists of four parts: anchoring foundation 1, mooring system, floating body foundation 6 and upper wind turbine 7.

[0042] Figure 3 ​As shown, there are two mooring cables 301, and the float 4 is located at the connection point between the two mooring cables 301. The float 4 is connected to the two mooring cables 301 through a connecting eye plate 8 (three-eye plate). A tension sensor 9 is installed at the connection point between the float 4 and the connecting eye plate 8. The tension sensor 9 can monitor the tension below the float 4 in real time.

[0043] like Figure 4 As shown, the float 4 includes a buoyancy chamber 401, a spring buffer chamber 402, and a T-shaped tie plate 403. The T-shaped tie plate 403 is composed of a vertical connecting plate and a horizontal support plate.

[0044] The buoyancy chamber 401 is positioned above the spring buffer chamber 402, and the T-shaped pull plate 403 is fitted inside the spring buffer chamber 402. The vertical connecting plate of the T-shaped pull plate 403 passes through the bottom surface of the spring buffer chamber 402, and its bottom is fixedly connected to the connecting eye plate 8.

[0045] like Figure 5 As shown, the spring buffer chamber 402 includes a spring support chamber 408 and a spring 407. The spring 407 is fixedly installed inside the spring support chamber 408 and is located on both sides of the transverse support plate of the T-shaped pull plate 403, and is located between the bottom surface of the transverse support plate and the bottom surface of the spring support chamber 408.

[0046] The buoyancy chamber 401 includes an airbag 405, a support frame 406, and an airbag vent 404. The airbag 405 is disposed within the support frame 406, and the airbag vent 404 is located at the top of the airbag 405. The pressure inside and outside the airbag support frame 406 is equal (the airbag support frame 406 may be a hollow structure). After the airbag 405 is inflated, it will expand within the support frame 406, filling the support frame 406. Figure 6 As shown.

[0047] The working principle of the mooring system of this invention is as follows: 1) By increasing the length of the mid-section mooring cable, it is easier to reconnect and install at sea; 2) By adding a buoy device, the buoyancy is used to tension the mooring cable to meet the tension requirements of the mooring system in place.

[0048] The workflow of a floating offshore wind turbine foundation mooring system includes the following steps:

[0049] Anchorage foundation end mooring system installation: Install the uninflated float 4 onto the mid-section mooring cable 3 (e.g. Figure 7 (As shown) — Connect the mid-section mooring cable 3 to the bottom section mooring chain 2 — Install the end of the bottom section mooring chain 2 onto the anchoring foundation 1 — Install the anchoring foundation 1 onto the seabed — Adjust the mooring cable 3 and the bottom section mooring chain 2 to ensure they are on the in-situ path;

[0050] The installation of the floating foundation end mooring system: the upper mooring chain 5 is installed on the floating foundation 6 with the upper wind turbine 7 at the dock, the floating foundation 6 is towed to the sea position, the upper mooring chain 5 is connected with the upper end of the mooring cable 3 on the seabed one by one, the buoy on the mooring cable 3 is inflated, and the tension change of the tension sensor at the upper end of the upper mooring chain 5 is observed, the inflation is stopped when the tension reaches the design value, and the above inflation operation is completed one by one and the equipment is recovered.

[0051] The adaptive buffer of the buoy: the T-shaped tension plate 403 is arranged in the buoy 4 to realize the buffer under the action of the air bag buoyancy and the spring elastic force, so as to cope with the instantaneous impact load in the oscillation motion, as shown in Figure 8 .

[0052] Before the buoy is inflated, the density thereof is close to that of water, so that the buoy is convenient to install in water; after the buoy is installed in place and inflated, the buoy can provide the required tension of the mooring system; the buoy in the working state in place can provide constant buoyancy to ensure the posture of each mooring line, when the floating body deviates from the balance position under the action of external environmental force, the posture of the mooring line is adjusted through the heave of the buoy to ensure that the floating body foundation makes periodic oscillation motion in the balance position; the spring buffer cabin arranged in the buoy is used to cope with the instantaneous impact load in the oscillation motion, as shown in Figure 9 , 10 , and 11.

[0053] The above-mentioned embodiments are only the preferred embodiments of the present application, and are not the limitation of the technical solutions of the present application, and any technical solutions which can be realized on the basis of the above-mentioned embodiments without creative labor shall be regarded as falling within the protection scope of the present application.

Claims

1. A floating offshore wind turbine foundation mooring system, characterized in that, It includes anchoring foundation (1), mooring system, floating body foundation (6) and top wind turbine (7); The mooring system includes a bottom mooring chain (2), an intermediate mooring cable (3), and an upper mooring chain (5); the length of the intermediate mooring cable (3) is greater than the straight-line connection distance between the bottom mooring chain (2) and the upper mooring chain (5), and the tension adjustment of the intermediate mooring cable (3) is achieved through buoyancy, thereby realizing the effective connection between the anchoring foundation (1) and the floating body foundation (6); The anchoring foundation (1) is connected to the bottom section mooring chain (2) of the mooring system; the bottom section mooring chain (2) is connected to the intermediate mooring cable (3); the intermediate mooring cable (3) is connected to the upper section mooring chain (5); the upper section mooring chain (5) is connected to the floating body foundation (6); the upper fan (7) is installed on the floating body foundation (6); The intermediate mooring cable (3) includes a mooring cable (301) and a float (4). The float (4) is connected to the mooring cable (301) through a connecting eye plate (8). A tension sensor (9) is installed at the connection position between the float (4) and the connecting eye plate (8). The tension sensor (9) can monitor the tension below the float (4) in real time. The float (4) includes a buoyancy chamber (401), a spring buffer chamber (402), and a T-shaped pull plate (403). The buoyancy chamber (401) is located above the spring buffer chamber (402), and the T-shaped pull plate (403) is installed inside the spring buffer chamber (402). The vertical connecting plate of the T-shaped pull plate (403) passes through the bottom surface of the spring buffer chamber (402), and its bottom is fixedly connected to the connecting eye plate (8). The buoyancy chamber (401) includes an airbag (405), a support frame (406), and an airbag vent (404). The airbag (405) is disposed inside the support frame (406), the airbag vent (404) is located at the top of the airbag (405), and the pressure inside and outside the support frame (406) is equal.

2. The offshore floating wind turbine foundation mooring system according to claim 1, characterized in that, One end of the mooring cable (301) is connected to the upper mooring chain (5), and the other end is connected to the bottom mooring chain (2). The buoy (4) is located in the middle of the mooring cable (301).

3. The offshore floating wind turbine foundation mooring system according to claim 1, characterized in that, The spring buffer chamber (402) includes a spring support chamber (408) and a spring (407). The spring (407) is fixedly installed inside the spring support chamber (408) and is located between the transverse support plate of the T-shaped pull plate (403) and the bottom surface of the spring support chamber (408).

4. The offshore floating wind turbine foundation mooring system according to claim 1, characterized in that, Multiple mooring systems and anchoring foundations (1) are connected to the floating body foundation (6), and the mooring systems and anchoring foundations (1) are matched.

5. The working method of a floating offshore wind turbine foundation mooring system according to claim 1, characterized in that, Includes the following steps: Step 1) Installation of mooring system at anchor foundation end: Install the uninflated buoy (4) onto the mooring cable (301), connect the mooring cable (301) to the bottom mooring chain (2), install the end of the bottom mooring chain (2) onto the anchor foundation (1), install the anchor foundation (1) onto the seabed, and adjust the mooring cable (301) and the bottom mooring chain (2) to be on the in-situ path; Step 2) Installation of the mooring system at the base of the floating body: Install the upper mooring chain (5) on the floating body base (6) equipped with the upper wind turbine (7) at the dock. Tow the floating body base (6) to the sea position. Connect the upper mooring chain (5) to the upper end of the mooring cable (301) on the seabed one by one. Inflate the buoy (4) on the mooring cable (301) and observe the tension change of the tension sensor at the upper end. Stop the inflation after the tension reaches the design value. Complete the above inflation operation one by one. Step 3) Adaptive buffering of the pontoon: A T-shaped pull plate (403) is set in the pontoon (4) to achieve buffering under the action of airbag buoyancy and spring force, in order to cope with the instantaneous impact load in the oscillating motion.

6. The working method of a floating offshore wind turbine foundation mooring system according to claim 5, characterized in that, The tension sensor (9) is built into the pin connecting the eye plate (8) and the float (4). The pin is pre-installed on the eye plate (8) and is finally connected in place by the underwater robot.

7. The working method of a floating offshore wind turbine foundation mooring system according to claim 5, characterized in that, After the float (4) is installed on the mooring cable (301), the underwater robot carries the inflation line and connects to the air bladder inlet (404) and starts the inflation equipment on the ship to inflate the float (4). After completion, the underwater robot disconnects the air bladder inlet (404) from the inflation line.

8. The working method of a floating offshore wind turbine foundation mooring system according to claim 5, characterized in that, Before being inflated, the density of the buoy (4) is close to that of water, making it easy to install in water. After installation and inflation, the buoy can provide the tension required by the mooring system. The buoy in its working state can provide constant buoyancy to ensure the attitude of each mooring line. When the float is subjected to external environmental forces and deviates from its equilibrium position, the attitude of the mooring line is adjusted by the rise and fall of the buoy to ensure that the float foundation makes periodic oscillating motion in the equilibrium position.

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