A floating offshore wind turbine system

Abstract

The present invention provides a floating offshore wind turbine system, including a basic buoy and an offshore wind power generation component, and also includes a mooring system and a structural vibration control system, wherein the mooring system includes a plurality of tensioned mooring chain groups fixed on the basic buoy, and the structural vibration control system includes a first connection platform arranged on the wind turbine tower and a plurality of semi-tensioned mooring chain groups fixed on the first connection platform. The floating offshore wind turbine system provided by the present invention, through the additional structural vibration control system, not only adds a plurality of support points specifically for the offshore wind power generation component, but also can effectively absorb the environmental load acting on the offshore wind power generation component and the vibration of the whole system through the structural vibration control system, reduce the overall motion response of the floating offshore wind turbine system, improve the stability of the floating offshore wind turbine system, thereby improving the power generation efficiency and service life of the offshore wind power generation component.

Description

Technical Field

[0001] The invention relates to the technical field of marine renewable energy utilization, and in particular to a floating offshore wind turbine system. Background Art

[0002] The sea is rich in wind energy and ocean current resources, and is the main direction of the current development and utilization of new energy. At present, offshore wind power development is mainly concentrated in shallow water areas, and wind turbines mostly use fixed foundations. With the deepening of development, offshore wind power development will develop towards offshore deepwater areas. In deepwater wind power development, fixed foundations have lost their superiority, and floating foundations have become ideal wind turbine support foundations.

[0003] High technical requirements and expensive construction and installation costs limit the promotion and application of offshore wind turbines with floating foundations. In order to improve the economic efficiency of development, floating offshore wind turbines are developing in the direction of large-scale. With the increase in the capacity of a single unit, the offshore wind power generation system has put forward higher requirements for the floating support foundation. The mooring system in the existing floating offshore wind turbine system has weak constraints on the overall wind turbine, which cannot meet the use of offshore wind turbines with increasing single-unit capacity, and cannot guarantee the stability of the offshore power generation system in the sea. The overall structure produces a large motion response under the combined action of wind, waves and currents, which seriously affects the working efficiency and service life of the offshore power generation system. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings that the mooring system of the existing floating offshore wind turbine cannot meet the use of the gradually increasing single-unit capacity of offshore wind turbines, cannot ensure the stability of the offshore power generation system in the sea area, and seriously affects the working efficiency and service life of the offshore power generation system, and to provide a floating offshore wind turbine system.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a floating offshore wind turbine system, including three fixedly connected basic buoys and offshore wind power generation components arranged on the basic buoys, the offshore wind power generation components are fixedly connected to the basic buoys through a wind turbine tower, and also include a mooring system and a structural vibration control system, the mooring system includes several groups of tensioned mooring chain groups fixed on the basic buoys, and the structural vibration control system includes a first connecting platform arranged on the wind turbine tower and several groups of semi-tensioned mooring chain groups fixed on the first connecting platform.

[0006] Furthermore, the mooring system includes three groups of the tensioned mooring chain groups, and the structural vibration control system includes three groups of the semi-tensioned mooring chain groups. The three groups of the semi-tensioned mooring chain groups and the three groups of the tensioned mooring chain groups are spaced apart from each other and evenly distributed on the periphery of the wind turbine tower.

[0007] Furthermore, the semi-tensioned mooring chain group includes a load-displacement controller arranged on the first connection platform, a first seabed anchor fixed to the seabed, and a first mooring chain connecting the load-displacement controller and the first seabed anchor.

[0008] Specifically, the tensioned mooring chain group includes a second connecting platform disposed on the base buoy, a second seabed anchor fixed to the seabed, and a second mooring chain connecting the second connecting platform with the second seabed anchor.

[0009] Specifically, the first seabed anchor is arranged between two adjacent second seabed anchors, so that the angles formed between the first mooring chain and the adjacent second mooring chains are the same.

[0010] Specifically, the first connecting platform is an annular fixing ring fixed on the wind turbine tower, and three mounting parts evenly distributed along the circumferential direction are arranged on the annular fixing ring. One end of the load-displacement controller is fixedly connected to the mounting part, and the other end is fixedly connected to the first mooring chain.

[0011] Specifically, the load-displacement controller is a spring damper, a hydraulic damper or a viscous damper.

[0012] Furthermore, the floating offshore wind turbine system also includes three groups of ocean current power generation components arranged below the basic buoy.

[0013] Specifically, the ocean current power generation assembly includes an ocean current power generation unit and a control assembly capable of driving the ocean current power generation unit to rotate and swing, and the ocean current power generation unit is movably connected to the base buoy through the control assembly.

[0014] Specifically, the control component includes a control system arranged in the basic buoy, a driving component adjusted by the control system, a main rotating shaft arranged in the basic buoy and connected to the driving component, a secondary rotating shaft connected to the driving component and arranged perpendicular to the main rotating shaft, and a connecting shaft that fixedly connects the secondary rotating shaft to the ocean current generator set.

[0015] The beneficial effects of a floating offshore wind turbine system provided by the present invention are that it includes a mooring system and a structural vibration control system. By adding a structural vibration control system, not only a plurality of support points specifically for offshore wind power generation components are added, but also the structural vibration control system can effectively absorb the environmental load acting on the offshore wind power generation components and the vibration of the entire system, thereby reducing the overall motion response of the floating offshore wind turbine system, improving the stability of the floating offshore wind turbine system, and thus improving the power generation efficiency and service life of the offshore wind power generation components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a floating offshore wind turbine system provided by the first embodiment of the present invention;

[0017] Figure 2 is a front view of a floating offshore wind turbine system provided by a first embodiment of the present invention;

[0018] Figure 3 is a top view of a floating offshore wind turbine system provided by a first embodiment of the present invention;

[0019] Figure 4 is a front view of a floating offshore wind turbine system provided by a second embodiment of the present invention;

[0020] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0021] Figure 6 It is a schematic structural diagram of the swinging of an ocean current generator set along a secondary rotation axis in a floating offshore wind turbine system provided by the second embodiment of the present invention.

[0022] In the figure: 100 (200) - floating offshore wind turbine system, 10 - foundation buoy, 20 - offshore wind turbine assembly, 21 - wind turbine tower, 30 - structural vibration control system, 31 - first connecting platform, 311 - annular fixing ring, 312 - mounting portion, 32 - semi-tensioned mooring chain group, 321 - load-displacement controller, 322 - first seabed anchor, 323 - first mooring chain, 33 - tensioned mooring chain group, 331 - second connecting platform, 332 - second seabed anchor, 333 - second mooring chain, 40 - ocean current power generation assembly, 41 - ocean current power generation unit, 42 - control assembly, 421 - main rotating shaft, 422 - secondary rotating shaft, 423 - connecting shaft. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Embodiment 1:

[0025] See also Figure 1-Figure 3, which is a floating offshore wind turbine system 100 provided by the first embodiment of the present invention. The floating offshore wind turbine system 100 includes a mooring system and a structural vibration control system 30. The tensioned mooring chain group 33 in the mooring system at the lower layer plays a limiting role, and the active control of the load-displacement controller 321 in the semi-tensioned mooring chain group 32 in the structural vibration control system 30 at the upper layer plays a role in suppressing the overall vibration of the offshore wind power generation component 20, thereby effectively controlling the stability of the entire floating offshore wind turbine system 100 within a certain sea area, providing more stable support for the offshore wind power generation component 20 with a large single-unit capacity, and improving the working efficiency and service life of the offshore wind power generation component 20 in offshore power generation.

[0026] Specifically, Figure 1 As shown, a floating offshore wind turbine system 100 provided by the present invention includes three fixedly connected basic buoys 10 and an offshore wind power generation assembly 20 arranged on the basic buoys 10. The three basic buoys 10 are arranged around the offshore wind power generation assembly 20, and the offshore wind power generation assembly 20 is fixedly connected to the basic buoys 10 through a wind turbine tower 21. A plurality of horizontally and obliquely arranged connecting rods are arranged between the three basic buoys 10 and the offshore wind power generation assembly 20, so that a triangular support structure that is firmly connected can be formed between the wind turbine tower 21 and each basic buoy 10. The wind turbine tower 21 of the offshore wind power generation assembly 20 is arranged at the center of the triangular area enclosed by the three basic buoys 10.

[0027] The floating offshore wind turbine system 100 provided by the present invention also includes a mooring system and a structural vibration control system 30. The mooring system includes a plurality of tensioned mooring chain groups 33 fixed on the base buoy 10; the structural vibration control system 30 includes a first connection platform 31 arranged on the wind turbine tower 21 and a plurality of semi-tensioned mooring chain groups 32 fixed on the first connection platform 31. In this embodiment, the mooring system includes three groups of tensioned mooring chain groups 33, and the tensioned mooring chain groups 33 are arranged one by one corresponding to the base buoy 10 and fixedly connected. The structural vibration control system 30 includes three groups of semi-tensioned mooring chain groups 32, and each group of semi-tensioned mooring chain groups 32 are fixed on the first connection platform 31. The three groups of semi-tensioned mooring chain groups 32 and the three groups of tensioned mooring chain groups 33 are arranged at intervals from each other and are evenly distributed on the periphery of the wind turbine tower 21. In order to ensure the stability of the offshore wind power generation component 20 working on the sea surface, the three groups of semi-tensioned mooring chain groups 32 in the structural vibration control system 30 provided by the present invention provide three-point support for the wind turbine tower 21, which can effectively suppress the movement response of the offshore wind power generation component 20 on the sea surface. The floating offshore wind turbine system 100 provided by the present invention is also provided with a motion monitoring system (not shown in the figure), which can monitor and collect data parameters of wind, waves, and currents of the entire floating offshore wind turbine system 100 on the sea surface and the seabed, as well as the motion state of the offshore wind power generation component 20 on the sea surface in real time. The data collected by the motion monitoring system is fed back to the structural vibration control system 30, and the semi-tensioned mooring chain group 32 in the structural vibration control system 30 is used to actively control the wind turbine tower 21 of the offshore wind power generation component 20. The tensioning force of the semi-tensioned mooring chain group 32 on the wind turbine tower 21 can be actively adjusted according to the data fed back by the motion monitoring system, so that the wind turbine tower 21 can be relatively stably set on the sea level, thereby suppressing the load motion response of the offshore wind power generation component 20, reducing the impact of offshore wind, waves, and currents on the offshore wind power generation component 20, and limiting the movement of the floating platform on the sea surface.

[0028] The structural vibration control system 30 provided by the present invention has three groups of semi-tensioned mooring chain groups 32 fixedly connected to the first connection platform 31 of the wind turbine tower 21. Three new support points are added to the periphery of the wind turbine tower 21 of the offshore wind power generation component 20. The three support points of the semi-tensioned mooring chain group 32 and the three support points formed by the other three groups of tensioned mooring chain groups 33 arranged on the basic buoy 10 together constitute six support points around the entire floating offshore wind turbine system 100. And each support point is arranged at intervals on the seabed to form six supports in different directions on the same horizontal plane, thereby improving the stability of the entire system. The three groups of semi-tensioned mooring chain groups 32 in the structural vibration control system 30 can automatically adjust the tightening or loosening state of the mooring chain group according to the on-site offshore environment, and play a role in active control. In addition, the three groups of tensioned mooring chain groups 33 in the mooring system are always in a tightened state, which plays a role in traction and restriction on the basic buoy 10. The tensioned mooring chain group 33 provided by the mooring system plays a role of basic limit, and the semi-tensioned mooring chain group 32 provided by the structural vibration control system 30 plays a role of suppressing motion response, which can provide sufficient support force and pre-tightening force for the offshore wind power generation component 20 and reduce the motion response of the wind turbine.

[0029] Specifically, Figure 1-2 As shown, the semi-tensioned mooring chain group 32 provided by the present invention includes a load-displacement controller 321 arranged on the first connection platform 31, a first seabed anchor 322 fixed to the seabed, and a first mooring chain 323 connecting the load-displacement controller 321 and the first seabed anchor 322. The first connection platform 31 is directly fixed on the wind turbine tower 21 of the offshore wind power generation component 20, so that the semi-tensioned mooring chain group 32 can directly act on the wind turbine tower 21. And the first connection platform 31 is located in the middle and lower section of the wind turbine tower 21, that is, the height H1 of the first connection platform 31 is 1 / 5-2 / 5 of the overall height of the wind turbine tower 21. In this embodiment, the height H1 of the first connection platform 31 from the bottom of the wind turbine tower 21 is 30 meters, so that the structural vibration control system 30 can effectively support the offshore wind power generation component 20. The first seabed anchor 322 is arranged on the seabed, and the first seabed anchor 322 is connected to the wind turbine tower 21 through the first mooring chain 323.

[0030] Specifically, Figure 1As shown, the first connection platform 31 is an annular fixing ring 311 fixed on the wind turbine tower 21, and three mounting parts 312 evenly distributed along the circumferential direction are arranged on the annular fixing ring 311. One end of the load-displacement controller 321 is fixedly connected to the mounting part 312, and the other end is fixedly connected to the first mooring chain 323. The mounting part 312 on the first connection platform 31 is arranged between two adjacent base buoys 10, so that the semi-tensioned mooring chain group 32 and the tensioned mooring chain group 33 can be spaced apart from each other. The first mooring chain 323 is made of steel cable material, has a strong supporting force, and can prevent damage to the structural vibration control system 30 when the sea waves are large.

[0031] Specifically, the load-displacement controller 321 in the semi-tensioned mooring chain group 32 is arranged on a side close to the wind turbine tower 21, and can provide motion compensation for the first mooring chain 323 according to the data collected by the motion monitoring system. In this embodiment, the load-displacement controller 321 is a spring damper, a hydraulic damper or a viscous damper. The load-displacement controller 321 increases the structural damping of the entire structural vibration control system 30, and can directly act on the first mooring chain 323 to absorb the environmental load of the external environment on the offshore wind power generation component 20, reduce the motion response and vibration amplitude of the wind turbine tower 21 caused by wind, waves, currents and offshore wind turbines when working, and ensure the stability and safety of the offshore wind power generation component 20 when working.

[0032] The mooring system provided in a floating offshore wind turbine system 100 provided by the present invention includes three sets of tensioned mooring chain groups 33 connected to the base buoy 10. The tensioned mooring chain group 33 includes a second connection platform 331 arranged on the base buoy 10, a second seabed anchor 332 fixed to the seabed, and a second mooring chain 333 connecting the second connection platform 331 and the second seabed anchor 332. The second seabed anchor 332 of the tensioned mooring chain group 33 is also arranged on the seabed and connected to the base buoy 10 through the second mooring chain 333. The second mooring chain 333 is arranged around the three base buoys 10 in a relaxed state, and is used to restrict the base buoys 10 within a fixed sea area. When the three base buoys 10 vibrate with the offshore environment, the second mooring chain 333 plays a traction role on the base buoys 10, thereby restricting the movement of the base buoys 10.

[0033] Furthermore, if Figure 3As shown, the semi-tensioned mooring chain group 32 in the structural vibration control system 30 and the tensioned mooring chain group 33 in the mooring system are arranged at intervals, wherein the first seabed anchor 322 is arranged between two adjacent second seabed anchors 332, so that the first mooring chain 323 and the adjacent second mooring chain 333 form an angle α and an angle β respectively, and the angle α and the angle β are the same and are both 60°. This arrangement makes the semi-tensioned mooring chain group 32 respectively located on the symmetric planes of the two adjacent tensioned mooring chain groups 33.

[0034] A floating offshore wind turbine system 100 provided by the present invention includes a mooring system and a structural vibration control system 30. By adding the structural vibration control system 30, not only a plurality of support points specifically for the offshore wind power generation components 20 are added, but also the structural vibration control system 30 can effectively absorb the environmental load acting on the offshore wind power generation components 20 and the vibration of the entire system, thereby reducing the overall motion response of the floating offshore wind turbine system 100, and improving the stability of the floating offshore wind turbine system 100, thereby improving the power generation efficiency and service life of the offshore wind power generation components 20.

[0035] Embodiment 2:

[0036] See also Figure 4-6 , which is a floating offshore wind turbine system 200 provided by the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the floating offshore wind turbine system 200 not only includes a mooring system and a structural vibration control system 30, but also includes three groups of ocean current power generation components 40 arranged below the base buoy 10. The ocean current power generation components 40 located below the sea level work together with the offshore wind power generation components 20 arranged above the sea level. The two cooperate with each other and can simultaneously utilize the wind energy at sea and the ocean currents on the seabed to generate electricity, which has great economic value. In addition, the motion response of the entire floating offshore wind turbine system 200 can be suppressed by the additional ocean current power generation components 40, further improving the stability of the system.

[0037] Furthermore, if Figure 5As shown, the ocean current power generation assembly 40 includes an ocean current generator set 41 and a control assembly 42 that can drive the ocean current generator set 41 to rotate and swing, and the ocean current generator set 41 is movably connected to the base buoy 10 through the control assembly 42. The ocean current generator set 41 is a relatively mature generator set that generates electricity by using the flow of submarine ocean currents, and will not be described in detail here. The data collected by the motion monitoring system (not shown in the figure) is fed back to the control assembly 42, and the relative position of the ocean current generator set 41 and the base buoy 10 as well as the posture, direction and load of the ocean current generator set 41 are adjusted through the control assembly 42, so as to achieve the kinetic energy generated by the ocean current generator set 41 when working to suppress the motion response and vibration of the entire floating offshore wind turbine system 200.

[0038] Specifically, Figure 5 As shown, the control assembly 42 includes a control system (not shown in the figure) disposed in the base buoy 10, a driving component (not shown in the figure) adjusted by the control system, a main rotating shaft 421 disposed in the base buoy 10 and connected to the driving component, a secondary rotating shaft 422 connected to the driving component and disposed perpendicularly to the main rotating shaft 421, and a connecting shaft 423 that fixedly connects the secondary rotating shaft 422 to the ocean current generator set 41. The main rotating shaft 421 is controlled by the driving component and can rotate horizontally along the central axis of the base buoy 10. The setting direction of the main rotating shaft 421 is coaxially arranged with the setting direction of the base buoy 10, so that the rotation of the main rotating shaft 421 can drive the secondary rotating shaft 422, the connecting shaft 423 and the ocean current generator set 41 disposed thereon to rotate horizontally along with the main rotating shaft 421. The two ends of the secondary rotating shaft 422 are rotatably fixed to the bottom of the main rotating shaft 421 and can rotate in a direction perpendicular to the central axis of the base buoy 10 controlled by the driving component. Both ends of the secondary rotating shaft 422 are movably fixed to the bottom of the main rotating shaft 421, and the secondary rotating shaft 422 is arranged perpendicular to the axial direction of the main rotating shaft 421. The rotation of the secondary rotating shaft 422 will drive the connecting shaft 423 fixed thereon to swing relative to the main rotating shaft 421. The rotation angle of the secondary rotating shaft 422 is as shown in FIG. Figure 6 As shown, it can rotate 0°-180° along the bottom surface of the main rotating shaft 421. Therefore, as the driving component drives, the secondary rotating shaft 422 can be driven to rotate around its center, driving the connecting shaft 423 to swing at the bottom of the main rotating shaft 421, and the swing angle of the connecting shaft 423 relative to the main rotating shaft 421 is 0°-180°.

[0039] The second embodiment of the present invention provides a floating offshore wind turbine system 200, which not only has the mooring system and structural vibration control system 30 provided by the present invention, but also can increase the support points of the offshore wind power generation component 20 through the structural vibration control system 30, absorb the environmental load acting on the offshore wind power generation component 20 and the vibration of the system as a whole, reduce the motion response of the system, and improve the stability of the system. It also has an ocean current power generation component 40, which can not only use ocean currents to generate electricity, and cooperate with the offshore wind power generation component 20 to improve the overall power generation and power generation efficiency of the system, but also can adjust the position, posture, direction and load of the ocean current power generation component 40 according to environmental conditions such as wind, waves, ocean currents and the motion response of the offshore wind power generation component 20, and by controlling the working state of the ocean current power generation component 40 below the sea level, the load and damping of the ocean current power generation component 40 can be adjusted, thereby playing a role in suppressing the motion response of the offshore wind power generation component 20 and improving the stability of the entire system.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A floating offshore wind turbine system, comprising three fixedly connected base buoys and an offshore wind power generation assembly arranged on the base buoys, wherein the offshore wind power generation assembly is fixedly connected to the base buoys through a wind turbine tower, characterized in that: It also includes a mooring system and a structural vibration control system, wherein the mooring system includes a plurality of tensioned mooring chain groups fixed on the basic buoy, and the structural vibration control system includes a first connecting platform arranged on the wind turbine tower and a plurality of semi-tensioned mooring chain groups fixed on the first connecting platform, wherein the first connecting platform is located in the middle and lower section of the wind turbine tower, and the height of the first connecting platform is 1 / 5-2 / 5 of the overall height of the wind turbine tower; the mooring system includes three groups of tensioned mooring chain groups, and the structural vibration control system includes three groups of semi-tensioned mooring chain groups. A mooring chain group, wherein the three groups of semi-tensioned mooring chain groups and the three groups of tensioned mooring chain groups are arranged at intervals and evenly distributed on the periphery of the wind turbine tower; the semi-tensioned mooring chain group includes a load-displacement controller arranged on the first connecting platform, a first seabed anchor fixed to the seabed, and a first mooring chain connecting the load-displacement controller to the first seabed anchor; the tensioned mooring chain group includes a second connecting platform arranged on the base buoy, a second seabed anchor fixed to the seabed, and a second mooring chain connecting the second connecting platform to the second seabed anchor; It also includes three groups of ocean current power generation components arranged below the basic buoy, the ocean current power generation components include an ocean current generator set and a control component that can drive the ocean current generator set to rotate and swing, the ocean current generator set is movably connected to the basic buoy through the control component, the control component includes a control system arranged in the basic buoy, a driving component regulated by the control system, a main rotating shaft arranged in the basic buoy and connected to the driving component, a secondary rotating shaft connected to the driving component and arranged perpendicular to the main rotating shaft, and a connecting shaft that fixedly connects the secondary rotating shaft to the ocean current generator set.

2. A floating offshore wind turbine system according to claim 1, characterized in that: The first seabed anchor is arranged between two adjacent second seabed anchors, so that the angles formed between the first mooring chain and the adjacent second mooring chains are the same.

3. A floating offshore wind turbine system according to claim 1, characterized in that: The first connecting platform is an annular fixing ring fixed on the wind turbine tower, and three mounting parts evenly distributed along the circumferential direction are arranged on the annular fixing ring. One end of the load-displacement controller is fixedly connected to the mounting part, and the other end is fixedly connected to the first mooring chain.

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