Offshore floating wind turbine foundation and offshore wind turbine

Abstract

The present invention relates to the field of offshore wind power technology, and discloses an offshore floating wind turbine foundation and an offshore wind turbine generator. The offshore floating wind turbine foundation includes a wind turbine set, a support structure and a floating platform. The support structure includes a main support rod arranged upright and at least two auxiliary support rods arranged obliquely. The top ends of the main support rod and all the auxiliary support rods are gathered to form an installation platform, and the wind turbine set is connected to the installation platform; the floating platform includes at least three floating devices, and the floating devices are connected to the bottom end of the support structure one by one. The present invention supports the wind turbine set by arranging a support structure, replacing the traditional tower structure with a larger diameter. The support structure has high rigidity, strong anti-deformation ability, small top acceleration, and significantly reduced inertial force on the structure; and the weight of the upper structure is significantly reduced, so the buoyancy required to be provided by the float is reduced, and the weight of the floating platform supported by the lower part is also reduced, further reducing the construction cost of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore floating wind turbine foundation and an offshore wind turbine generator. Background Art

[0002] At present, mainstream offshore floating wind turbines mainly use upright cylindrical towers to support the upper wind turbine units.

[0003] In this solution, when the upper wind turbine is heavier and the blades are longer, the load on the bottom support structure is very large due to the large swing of the structure. Therefore, the diameter of the cylindrical tower must be increased so that it can withstand the larger load.

[0004] This will undoubtedly lead to excessive costs and increased weight. Summary of the invention

[0005] In view of this, the present invention provides an offshore floating wind turbine foundation and an offshore wind turbine generator to solve the problem that the tower diameter needs to be increased to resist the load, resulting in increased weight and cost, and a large load on the bottom support structure.

[0006] In a first aspect, the present invention provides an offshore floating wind turbine foundation, comprising a wind turbine group, a supporting structure and a floating platform, wherein the supporting structure comprises an upright main supporting pole and at least two inclined auxiliary supporting poles, the top ends of the main supporting pole and all the auxiliary supporting poles are gathered together to form an installation platform, and the wind turbine group is connected to the installation platform; the floating platform comprises at least three floating devices, and the floating devices are connected to the bottom end of the supporting structure one by one.

[0007] Beneficial effects: By setting up a supporting structure, the wind turbine is connected to the top of the supporting structure, and at least three supporting rods are used to support the wind turbine, replacing the traditional tower structure with a larger diameter. The supporting structure has high rigidity, strong deformation resistance, small top acceleration, and significantly reduced inertial force on the structure; and the weight of the upper structure is significantly reduced, so the buoyancy that the float needs to provide is reduced, and the weight of the floating platform supported by the lower part is also reduced, further reducing the construction cost of the structure.

[0008] In an optional implementation, the wind turbine generator set is an upwind wind turbine.

[0009] Beneficial effect: By using upwind wind turbines and coordinating the active yaw control system with the wind measurement system, the unit can be dynamically adjusted to align with the incoming wind direction, which can achieve rapid active yaw within a certain angle and avoid the disadvantage of slow wind speed of single-point mooring.

[0010] In an optional embodiment, the length of the auxiliary support rod is greater than that of the main support rod, and the auxiliary support rods are spaced apart and distributed on both sides of the main support rod.

[0011] Beneficial effects: The auxiliary support rods use diagonal bracing to support the upper wind turbines. Compared with a single vertical support tower, less material can be used to resist strong wind thrust and inertia caused by movement. Two or more auxiliary support rods are tilted on both sides relative to the main support rods to form a stable support structure, ensuring that the auxiliary support rods can share the bending moment and ensure the strength of the support structure.

[0012] In an optional embodiment, a single-point mooring device is further included, and the single-point mooring device is located on the wind inlet side of the wind turbine generator set.

[0013] Beneficial effects: By setting up a single-point mooring device, passive yaw can be achieved, so that the floating device is always in a state of minimum load under the action of external load, which is beneficial to structural safety and extends fatigue life; the wind turbine can actively yaw within a certain angle, improve yaw efficiency, avoid yaw failure, and achieve the best wind power generation state.

[0014] In an optional embodiment, the auxiliary support rod adopts a truss structure.

[0015] Beneficial effects: The auxiliary support rod adopts a truss structure, which can save materials, reduce weight and cost, further reduce the weight of the upper structure, and the weight of the floating platform supported by the lower part also decreases, further reducing the construction cost of the structure; and, the auxiliary support rod adopts a truss structure, and the force distribution is more reasonable.

[0016] In an optional embodiment, the single point mooring device is connected to the floating device at the bottom of the main support pole, and one end of the single point mooring device is suitable for anchoring on the seabed.

[0017] Beneficial effects: With this arrangement, the single-point mooring device can be arranged on the wind inlet side of the wind turbine generator set, thereby achieving cooperation between the upwind wind turbine and the yaw control system.

[0018] In an optional embodiment, the single-point mooring device includes an extension rod, one end of which is connected to the floating device at the bottom of the main support rod, and the other end of the extension rod is connected to the mooring cable.

[0019] Beneficial effect: By setting an extension rod, the mooring point can be set at a position far away from the wind turbine, which can increase the bending moment of the structure when it is yawed and improve the passive yaw effect.

[0020] In an optional embodiment, the floating platform further includes a connection foundation, and the floating device is connected to the connection foundation; and the bottom ends of the supporting structures are respectively connected to the corners of the connection foundation.

[0021] Beneficial effects: This arrangement, on the one hand, can connect the supporting structure to improve the stability and structural strength of the entire structure of the offshore floating wind turbine foundation; on the other hand, it can connect multiple floating devices into one to ensure the stability of the floating platform.

[0022] In an optional embodiment, the connection base is a triangle, and the connection base includes a first connection edge, the first connection edge is arranged opposite to the bottom end of the main support rod, and the extension rod is collinear with the midline of the first connection edge.

[0023] Beneficial effects: With this arrangement, the connection foundation is set as a triangle, which has a compact structure, is stable and reliable, and the three corners of the connection foundation can respectively correspond to the bottom ends of the main support rod and the two auxiliary support rods to ensure structural stability. The extension rod is arranged in line with the midline of the first connection edge, so that the floating device is always in a state of minimum stress under the action of external loads, which is beneficial to structural safety and extending fatigue life.

[0024] In a second aspect, the present invention further provides an offshore wind turbine, comprising an offshore floating wind turbine foundation according to any one of the above technical solutions.

[0025] Beneficial effects: Since the offshore wind turbine includes an offshore floating wind turbine foundation, it has the same effects as the offshore floating wind turbine foundation and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A three-dimensional diagram of an offshore floating wind turbine foundation according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of a first side view of an offshore floating wind turbine foundation is shown;

[0029] Figure 3 for Figure 1 A schematic diagram of a second side view of an offshore floating wind turbine foundation is shown;

[0030] Figure 4 for Figure 1 A top view of an offshore floating wind turbine foundation is shown.

[0031] Description of reference numerals:

[0032] 1. Wind turbine; 2. Support structure; 201. Main support pole; 202. Auxiliary support pole; 3. Floating platform; 301. Floating device; 302. Connection foundation; 3021. First connection edge; 4. Single-point mooring device; 401. Extension pole; 402. Mooring cable; 403. Reinforcement pole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, an offshore floating wind turbine foundation is provided, including a wind turbine 1, a support structure 2 and a floating platform 3, the support structure 2 includes an upright main support rod 201 and at least two inclined auxiliary support rods 202, the top ends of the main support rod 201 and all the auxiliary support rods 202 are gathered together to form an installation platform, and the wind turbine 1 is connected to the installation platform; the floating platform 3 includes at least three floating devices 301, and the floating devices 301 are connected to the bottom end of the support structure 2 one by one.

[0036] By setting the support structure 2, the wind turbine 1 is connected to the top of the support structure 2, and the upright main support rod 201 is used to support the upper wind turbine 1, which can better bear the gravity of the upper wind turbine 1. The remaining support rods are tilted to share the bending moment, and there is no need to set a tower with a larger diameter, which reduces the construction cost. At the same time, the weight of the upper structure is significantly reduced, and the buoyancy required to be provided by the floating body is reduced, and the weight of the floating platform 3 supported by the lower part is also reduced, further reducing the construction cost of the structure. At least three support rods are used to support the wind turbine 1, replacing the traditional tower structure with a larger diameter. The three support rods can form a triangular stable structure with large structural rigidity, strong anti-deformation ability, small top acceleration, and significantly reduced inertial force on the structure; in the support structure 2, except for the main support rod 201, the remaining auxiliary support rods 202 are tilted to avoid the tower from suffering excessive bending moment, reduce the tower mass, and reduce the displacement and acceleration of the tower top.

[0037] In one embodiment, the wind turbine generator set 1 is an upwind wind turbine.

[0038] Specifically, the upwind wind turbine includes an active yaw control system.

[0039] The use of an upwind wind turbine can achieve active yaw, ensuring that the wind turbine 1 can measure the wind direction under the coordinated action of the blade aerodynamic force and the yaw control system, and rotate the nose to face the wind, and independently and automatically yaw within a certain angle.

[0040] In one embodiment, the length of the auxiliary support rod 202 is greater than that of the main support rod 201 , and the auxiliary support rods 202 are spaced apart and distributed on both sides of the main support rod 201 .

[0041] The auxiliary support rod 202 supports the upper wind turbine 1 in an oblique bracing manner. Compared with a single upright support tower, less material can be used to resist the strong wind thrust and inertia caused by movement. Two or more auxiliary support rods 202 are tilted and distributed on both sides relative to the main support rod 201, thereby forming a stable support structure, ensuring that the auxiliary support rods 202 can share the bending moment and ensure the strength of the support structure.

[0042] In one embodiment, two auxiliary support rods 202 are provided, and the two auxiliary support rods 202 are relatively distributed on two sides of the main support rod 201 .

[0043] Specifically, the angles at which the two auxiliary support rods 202 are inclined relative to the main support rod 201 may be the same or different. In one embodiment, the angles at which the two auxiliary support rods 202 are inclined relative to the main support rod 201 are the same, thereby ensuring that the two auxiliary support rods 202 can share the bending moment as evenly as possible and ensure the strength of the support structure 2.

[0044] Specifically, the angle between the two auxiliary support rods 202 and the main support rod 201 should be selected according to specific design requirements to balance the stability, performance and structural strength of the wind turbine. The optimal angle range can be determined through relevant engineering analysis and simulation.

[0045] In one embodiment, the auxiliary support rod 202 adopts a truss structure.

[0046] The auxiliary support rod 202 adopts a truss structure, which can save materials, reduce weight and cost, further reduce the weight of the upper structure, and the weight of the floating platform 3 supported by the lower part also decreases, further reducing the construction cost of the structure; and, the auxiliary support rod 202 adopts a truss structure, and the force distribution is more reasonable.

[0047] In the related art, there is a technical solution that sets the single-point mooring on the leeward side, which belongs to the downwind wind turbine. The downwind wind turbine means that the wind turbine blades are located on the downwind side of the wind direction, that is, the wind blows from the leeward side of the wind turbine to the wind turbine, and the wind force drives the wind turbine blades to rotate, thereby driving the generator to generate electricity. The passive yaw of the entire wind turbine is achieved under the action of wind force, but the yaw system is slow and prone to misalignment in extreme sea conditions, resulting in structural damage; and in the real marine environment, there are working conditions where the wind and waves are not in line, which may cause the yaw failure of this method.

[0048] In order to solve the above technical problem, in one embodiment, a single-point mooring device 4 is further included, and the single-point mooring device 4 is located on the wind inlet side of the wind turbine 1 .

[0049] By setting up the single-point mooring device 4, passive yaw can be achieved, so that the floating device 301 is always in a state of minimum load under the action of external load, which is beneficial to structural safety and extending fatigue life. The single-point mooring device 4 is set on the windward side of the wind turbine 1, and the wind turbine 1 can actively yaw within a certain angle, improve yaw efficiency, avoid yaw failure, and achieve the best wind power generation state.

[0050] The technical solution of combining a single-point mooring device 4 with an upwind wind turbine has the advantage that single-point mooring can achieve the overall passive yaw of the floating platform to avoid blade sweeping the tower; at the same time, the overall structure is placed in a position with less load, reducing the fatigue load of the structure, and also reducing the ultimate load of the structure under extreme sea conditions to avoid damage. Compared with the passive yaw of the wind turbine as a whole, the active yaw of the upper wind turbine unit 1 can increase the yaw speed. At the same time, when the wind and waves are not in the same line, the inaccurate wind caused by the passive yaw of the single-point mooring can be avoided, and the yaw failure can be avoided, so as to achieve the optimal power generation state of the floating wind turbine unit 1.

[0051] In one embodiment, the single point mooring device 4 is connected to the floating device 301 at the bottom of the support pole, and one end of the single point mooring device 4 is suitable for anchoring on the seabed.

[0052] In this way, the single-point mooring device 4 can be arranged on the wind inlet side of the wind turbine 1, so as to achieve cooperation between the upwind wind turbine and the yaw control system.

[0053] In one embodiment, the single point mooring device 4 includes an extension rod 401 , one end of the extension rod 401 is connected to the floating device 301 at the bottom of the main support rod 201 , and the other end of the extension rod 401 is connected to the mooring cable 402 .

[0054] By providing the extension rod 401 , the mooring point can be set at a position far away from the wind turbine generator set 1 , which can increase the bending moment of the structure when it is yawed and improve the passive yaw effect.

[0055] Specifically, the length of the extension rod 401 should be optimized according to the specific fan design and environmental conditions to ensure the stability and performance of the fan. The optimal length can be determined through engineering analysis and simulation.

[0056] In one embodiment, the single-point mooring device 4 also includes a reinforcing rod 403, which is inclined and located on the upper part of the extension rod 401, and the two ends of the reinforcing rod 403 are respectively connected to the floating device 301 and the extension rod 401, and the floating platform 3 also includes a connecting foundation 302, and the floating device 301 is connected to the connecting foundation 302; the bottom ends of the supporting structure 2 are respectively connected to the corners of the connecting foundation 302; the connecting foundation 302 includes a first connecting edge 3021, and the first connecting edge 3021 is arranged opposite to the bottom end of the main support rod 201, and the center lines of the extension rod 401 and the first connecting edge 3021 are collinear.

[0057] This arrangement can reduce the load on the floating device 301 during its up and down shaking process, reduce the bending moment on the extension rod 401, and make the load distribution more reasonable.

[0058] Specifically, a single mooring cable 402 may be provided, or multiple mooring cables 402 may be provided. When multiple mooring cables 402 are provided, the first ends of the multiple mooring cables 402 are all connected to the extension rod 401, and the second ends of the multiple mooring cables 402 are distributed at intervals and anchored on the seabed.

[0059] By setting the connection foundation 302, on the one hand, the support structure 2 can be connected to improve the stability and structural strength of the entire structure of the offshore floating wind turbine foundation. On the other hand, multiple floating devices 301 can be connected together to ensure the stability of the floating platform 3.

[0060] In one embodiment, the connection base 302 is triangular in shape.

[0061] The midline of the first connecting edge 3021 is as follows Figure 4 As shown in L.

[0062] In this way, the connection base 302 is set to be triangular, with a compact structure, stable and reliable, and the three corners of the connection base 302 can respectively correspond to the bottom ends of the main support rod 201 and the two auxiliary support rods 202 to ensure structural stability. The extension rod 401 is arranged in line with the midline of the first connection edge 3021, so that the floating device 301 is always in a state of minimum stress under the action of external loads, which is beneficial to structural safety and extending fatigue life.

[0063] In one embodiment, the connection base 302 is in the shape of an equilateral triangle.

[0064] The connection base 302 is set to an equilateral triangle structure, which is simple in structure and easy to design and manufacture. Moreover, after the main support rod 201 and the two auxiliary support rods 202 are connected, as long as the main support rod 201 is kept upright, the two auxiliary support rods 202 on both sides of the main support rod 201 are automatically symmetrically arranged to ensure that the two auxiliary support rods 202 and the main support rod 201 form the same inclination angle.

[0065] In one embodiment, the connection base 302 includes at least two layers of triangular support frames arranged vertically, and reinforcing ribs are connected between the upper and lower adjacent support frames.

[0066] This arrangement makes the connection foundation 302 structure more stable, ensuring the overall stability of the offshore floating wind turbine foundation when yawed.

[0067] According to an embodiment of the present invention, on the other hand, there is also provided an offshore wind turbine, comprising an offshore floating wind turbine foundation according to any one of the above technical solutions.

[0068] Since the offshore wind turbine includes an offshore floating wind turbine foundation, which has the same effect as the offshore floating wind turbine foundation, it will not be described in detail here.

[0069] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An offshore floating wind turbine foundation, characterized in that: include: Wind turbine (1); A support structure (2), the support structure (2) comprising a main support rod (201) arranged upright and at least two auxiliary support rods (202) arranged obliquely, the top ends of the main support rod (201) and all the auxiliary support rods (202) being brought together to form a mounting platform, the wind turbine set (1) being connected to the mounting platform, and the wind turbine set (1) being capable of actively yaw within a certain angle; A floating platform (3), the floating platform (3) comprising at least three floating devices (301), the floating devices (301) being connected to the bottom ends of the supporting structure (2) in a one-to-one correspondence; The wind turbine set (1) is an upwind wind turbine; It also includes a single-point mooring device (4), wherein the single-point mooring device (4) is located on the wind inlet side of the wind turbine generator set (1); The floating platform (3) further comprises a connection foundation (302), and the floating device (301) is connected to the connection foundation (302); the bottom ends of the support structure (2) are respectively connected to the corners of the connection foundation (302), and the floating device (301) connected to the auxiliary support rod (202) is arranged on the leeward side of the wind turbine (1); The auxiliary support rod (202) adopts a truss structure; The single-point mooring device (4) comprises an extension rod (401), one end of the extension rod (401) is directly connected to the lower end of the floating device (301) at the bottom of the main support rod (201), and the other end of the extension rod (401) is connected to a mooring cable (402); The single-point mooring device (4) further comprises a reinforcing rod (403), wherein the reinforcing rod (403) is arranged obliquely and is located on the upper part of the extension rod (401), and the two ends of the reinforcing rod (403) are respectively connected to the floating device (301) and the extension rod (401); The connection base (302) comprises a first connection edge (3021), the first connection edge (3021) being arranged opposite to the bottom end of the main support rod (201), and the extension rod (401) and the midline of the first connection edge (3021) being collinear.

2. The offshore floating wind turbine foundation according to claim 1, characterized in that: The length of the auxiliary support rod (202) is greater than the length of the main support rod (201), and the auxiliary support rods (202) are distributed at intervals on both sides of the main support rod (201).

3. The offshore floating wind turbine foundation according to claim 1, characterized in that: One end of the single point mooring device (4) is suitable for anchoring on the seabed.

4. An offshore wind turbine, characterized in that: An offshore floating wind turbine foundation comprising any one of claims 1 to 3.

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