Double-machine-head offshore floating type wind turbine generator

Abstract

The invention discloses a double-machine-head offshore floating type wind turbine generator which comprises a floating foundation, a mooring assembly and a flow guide wing, two tower barrels are arranged on the floating foundation, the upper end of each tower barrel is provided with a machine head, the two machine heads face the same direction, the mooring assembly comprises a mooring cable and a mooring foundation, and the mooring cable is connected with the mooring foundation through the mooring cable. The mooring cable is connected with the floating foundation and the mooring foundation, the mooring foundation is suitable for being fixed to the seabed, the flow guide wings are installed above the floating foundation, and the floating foundation is suitable for being driven by the flow guide wings to rotate around the mooring cable so that the axial direction of the machine head can be consistent with the wind direction. The double-machine-head offshore floating type wind turbine generator set has the advantages that the operation and maintenance cost is low, the utilization rate of wind energy resources is high, and the power generation efficiency of the fan is high.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a double-head offshore floating wind turbine generator set. Background Art

[0002] The global demand for clean energy is increasing, and wind energy, as a renewable and clean energy source, has been widely used. At present, my country's offshore wind farms are mainly arranged in offshore waters, but the wind energy resources in the deep sea are more abundant than those in the offshore area, with reserves of about 1 billion kilowatts, equivalent to twice the offshore resources, showing huge development potential. With the gradual advancement of offshore wind power development, the development area is bound to expand from the offshore to the deep sea. However, whether it is a fixed foundation or a floating wind turbine, the direction of the wind turbine is fixed, but due to the complex and changeable environment of the sea surface (especially the deep sea), the wind turbine cannot always face the wind direction, which leads to low utilization of wind energy resources and low wind turbine power generation efficiency. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a dual-head offshore floating wind turbine unit, which has the advantages of low operation and maintenance cost, high utilization rate of wind energy resources, and high wind turbine power generation efficiency.

[0005] The dual-head offshore floating wind turbine unit of the embodiment of the present invention comprises a floating foundation, a mooring assembly and a guide wing, wherein the floating foundation is provided with two towers, a head is installed at the upper end of each of the towers, and the two heads are oriented in the same direction; the mooring assembly comprises a mooring cable and a mooring foundation, the mooring cable connects the floating foundation and the mooring foundation, and the mooring foundation is suitable for being fixed on the seabed; the guide wing is installed above the floating foundation, and the floating foundation is suitable for rotating around the mooring cable driven by the guide wing so that the axial direction of the head is consistent with the wind direction.

[0006] According to the dual-head offshore floating wind turbine set of the embodiment of the present invention, the two towers and the heads float on the sea surface through a floating foundation, and are fixed to a set area on the seabed through mooring cables and a mooring foundation, and the tower, the head and the floating foundation as a whole can rotate around the mooring cables. At this time, by arranging a guide wing above the floating foundation, in a windy environment, the guide wing can always be gradually adjusted to a position with the least wind resistance under the action of wind force. At this time, the axial direction of the head is consistent with the wind direction, and thus it can withstand greater wind force, so as to better utilize wind energy resources, and the head has a higher power generation efficiency. Moreover, the two heads share a floating foundation, and the operation and maintenance cost of the dual-head offshore floating wind turbine set is low.

[0007] In some embodiments, the floating foundation includes a first buoy, a first cross brace and a second buoy, the upper end of the mooring cable is connected to the first buoy; there are two first cross braces, and the first ends of the two first cross braces are connected to the first buoy; there are two second buoys, and the two second buoys are respectively connected to the second ends of the two first cross braces, and the two towers are respectively installed on the two second buoys.

[0008] In some embodiments, the floating foundation further includes a second cross brace and a third floating body, there are two second cross braces, the first ends of the two second cross braces are respectively connected to the two second floating bodies; the third floating body is connected to the second ends of the two second cross braces.

[0009] In some embodiments, the floating foundation further includes a third cross brace and a fourth cross brace, the third cross brace is connected to the fourth cross brace, both ends of the third cross brace are respectively connected to two of the second floating bodies, and both ends of the fourth cross brace are respectively connected to the first floating body and the third floating body.

[0010] In some embodiments, the guide vane is provided on a side of each tower tube facing the first floating body, the nose includes a cabin and wind blades, and the wind blades are located on a side of the cabin facing away from the first floating body.

[0011] In some embodiments, the guide wing is also connected to the first floating body;

[0012] And / or, the two guide wings are arranged in mirror symmetry, the two towers are arranged in mirror symmetry, each tower is inclined relative to the corresponding second floating body in a direction away from the first floating body, and the distance between the two towers gradually increases from bottom to top.

[0013] In some embodiments, the first floating body includes a first buoy, the outer contour of the first buoy is cylindrical, and the center position of the lower end surface of the first buoy is connected to the upper end of the mooring cable.

[0014] In some embodiments, the second buoy and the third buoy both include a heave plate and a second buoy disposed above the heave plate.

[0015] In some embodiments, the mooring line comprises a tension hamstring tendon and the mooring foundation comprises a suction cylinder.

[0016] In some embodiments, the number of the suction cylinder is one, the number of the tension hamstring tendons is at least two, and all the tension hamstring tendons are arranged adjacent to each other in pairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a dual-head offshore floating wind turbine according to an embodiment of the present invention.

[0018] Figure 2 1 is another schematic diagram of a dual-head offshore floating wind turbine according to an embodiment of the present invention.

[0019] Figure 3 It is another schematic diagram of a dual-head offshore floating wind turbine according to an embodiment of the present invention.

[0020] Figure 4 1 is a top view of a dual-head offshore floating wind turbine according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1. The first buoy; 2. The first cross brace; 3. The second buoy; 31. The second buoy; 32. The heave plate; 4. The tower; 5. The nose; 51. The cabin; 52. The wind blade; 6. The guide wing; 7. The tension hamstring tendon; 8. The suction cylinder; 9. The third buoy; 10. The second cross brace; 11. The third cross brace; 12. The fourth cross brace. DETAILED DESCRIPTION

[0023] 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.

[0024] Combine the following Figure 1-Figure 4 A double-head offshore floating wind turbine generator system according to an embodiment of the present invention is described.

[0025] The dual-head offshore floating wind turbine of the embodiment of the present invention comprises a floating foundation, a mooring assembly and a guide vane 6. Two towers 4 are provided on the floating foundation, and a head 5 is installed on the upper end of each tower 4, and the two heads 5 are oriented in the same direction. The mooring assembly comprises a mooring cable and a mooring foundation, and the mooring cable connects the floating foundation and the mooring foundation, and the mooring foundation is suitable for being fixed on the seabed. The guide vane 6 is installed above the floating foundation, and the floating foundation is suitable for rotating around the mooring cable driven by the guide vane 6 so that the axial direction of the head 5 is consistent with the wind direction.

[0026] According to the dual-head offshore floating wind turbine set of the embodiment of the present invention, the two towers 4 and the head 5 float on the sea surface through a floating foundation, and are fixed to a set area on the seabed through mooring cables and a mooring foundation, and the tower 4, the head 5 and the floating foundation as a whole can rotate around the mooring cables. At this time, by arranging the guide wing 6 above the floating foundation, in a windy environment, the guide wing 6 can always be gradually adjusted to a position with the least wind resistance under the action of wind force. At this time, the axial direction of the head 5 is consistent with the wind direction, and then it can withstand greater wind force, so as to better utilize wind energy resources, and the power generation efficiency of the head 5 is higher. Moreover, the two heads 5 share a floating foundation, and the operation and maintenance cost of the dual-head offshore floating wind turbine set is low.

[0027] It should be noted that the guide wing 6 is generally triangular, and the whole can be a hard plate structure, or a combination of a frame and soft fabric. By setting the guide wing 6 to adjust the position of the head 5, the dual-head offshore floating wind turbine of this embodiment can adapt to the complex and changeable environment of the deep sea, and the cost is lower than that of the fixed foundation offshore wind turbine.

[0028] In some embodiments, the floating foundation includes a first floating body 1, a first cross brace 2, and a second floating body 3, and the upper end of the mooring cable is connected to the first floating body 1. There are two first cross braces 2, and the first ends of the two first cross braces 2 are connected to the first floating body 1. There are two second floating bodies 3, and the two second floating bodies 3 are respectively connected to the second ends of the two first cross braces 2, and the two towers 4 are respectively installed on the two second floating bodies 3.

[0029] A first buoy 1 and two second buoys 3 are arranged in a triangle, so that the floating foundation has strong floating stability and strong support reliability for the two towers 4 and the head 5. By setting a mooring cable connected to the first buoy 1, the floating foundation rotates with the first buoy 1 as a reference in a windy environment, and the centrifugal force of the two towers 4 and the head 5 when rotating accordingly is basically the same, and the floating foundation has higher rotation stability.

[0030] Specifically, the extension directions of the two first cross braces 2 are at an angle, the two first cross braces 2 are arranged in a mirror-symmetrical manner relative to a reference plane located therebetween, the two second pontoons 3 are arranged in a mirror-symmetrical manner relative to the above-mentioned reference plane, and one group of towers 4 and noses 5 are arranged in a mirror-symmetrical manner relative to the above-mentioned reference plane with respect to the other group of towers 4 and noses 5.

[0031] In some embodiments, the floating foundation further includes a second cross brace 10 and a third buoy 9. There are two second cross braces 10, and the first ends of the two second cross braces 10 are respectively connected to the two second buoys 3. The third buoy 9 is connected to the second ends of the two second cross braces 10.

[0032] The third buoy 9 further improves the floating reliability of the floating foundation on the sea surface, and its support reliability for the two towers 4 and the nose 5 is higher. At the same time, it also makes the center of gravity of the floating foundation shift away from the first buoy 1, so that the tower 4 and the nose 5 can be arranged more flexibly.

[0033] Specifically, the first floating body 1, the two second floating bodies 3 and the third floating body 9 are arranged in a rhombus shape with four corners, and the two second cross braces 10 are arranged in mirror symmetry with respect to the above reference plane.

[0034] In some embodiments, the floating foundation further includes a third cross brace 11 and a fourth cross brace 12, the third cross brace 11 is connected to the fourth cross brace 12, both ends of the third cross brace 11 are respectively connected to the two second floating bodies 3, and both ends of the fourth cross brace 12 are respectively connected to the first floating body 1 and the third floating body 9.

[0035] The arrangement of the third cross brace 11 and the fourth cross brace 12 increases the connection strength between the second buoy 3 and the first buoy 1, and between the other second buoy 3 and the third buoy 9, and increases the connection strength between the first buoy 1 and the third buoy 9. As a result, the floating foundation as a whole can withstand greater impact without deformation or damage, and can better adapt to the complex deep-sea environment to better utilize deep-sea wind energy resources.

[0036] Specifically, the third cross brace 11 and the fourth cross brace 12 are welded to each other and arranged in a cross shape. The first cross brace 2 to the fourth cross brace 12 are all metal round tubes. In order to further ensure the structural strength of the floating foundation, strengthening of the diagonal ribs may also be considered. The first cross brace 2 to the fourth cross brace 12 are connected to the nearby floating body through the strengthening of the diagonal ribs.

[0037] In some embodiments, Figure 1 As shown, each tower 4 is provided with a guide vane 6 on the side facing the first floating body 1 , and the nose 5 includes a cabin 51 and a wind blade 52 , and the wind blade 52 is located on the side of the cabin 51 facing away from the first floating body 1 .

[0038] That is, under the common guidance of the two guide wings 6, in a low wind environment, the floating foundation can complete the rotation faster and better ensure the consistency of the axial direction of the wind turbine with the wind direction. In addition, the head 5 is designed for downwind power generation, which effectively avoids the fan blades 52 and the guide wings 6 being located on the same side of the tower 4, causing the two to interfere with each other, and effectively ensures the power generation efficiency of the head 5.

[0039] Specifically, the two guide wings 6 are arranged in mirror symmetry with respect to the reference plane, the outer contour of the guide wings 6 is a triangle, and the width of the guide wings 6 decreases from bottom to top.

[0040] In some embodiments, Figure 1 and Figure 4As shown, the guide wing 6 is also connected to the first floating body 1. And / or, the two guide wings 6 are arranged in mirror symmetry, the two towers 4 are arranged in mirror symmetry, each tower 4 is inclined relative to the corresponding second floating body 3 in a direction away from the first floating body 1, and the distance between the two towers 4 gradually increases from bottom to top.

[0041] The end of the guide wing 6 away from the tower 4 is connected to the first buoy 1, so when the guide wing 6 is impacted by wind, it is less likely to be deformed or even damaged relative to the tower 4 and the floating foundation, and the guide wing 6 has a higher reliability in adjusting the direction of the head 5. In addition, by setting the tower 4 to be inclined in the direction away from the first buoy 1 and the adjacent tower 4, on the one hand, on the basis of a certain distance between the two second buoys 3, the distance between the two heads 5 is made larger, and it is less likely to interfere. On the other hand, it is also better to ensure that the center of gravity of the tower 4 and the head 5 is located directly above the center of gravity of the floating foundation, and the floating stability of the double-head offshore floating wind turbine on the sea surface is stronger.

[0042] For example, the first buoy 1 includes a first buoy, the outer contour of the first buoy is cylindrical, the extension direction of the first buoy is consistent with the height direction of the floating foundation, and the center position of the lower end surface of the first buoy is connected to the upper end of the mooring cable. The first buoy 1 also includes a first frame, the first buoy is fixed on the first frame, and the first frame is welded to the first cross brace 2.

[0043] In some embodiments, the second buoy 3 and the third buoy 9 both include a heave plate 32 and a second buoy 31 disposed above the heave plate 32 .

[0044] The provision of the heave plate 32 makes it less likely for the second buoy 3 and the third buoy 9 to float up and down significantly when rotating around the first buoy, thereby making the center of gravity of the floating foundation more stable and the nose 5 thereon more stable.

[0045] Specifically, the second buoy 3 and the third buoy 9 also include a second frame and a third frame welded to the first cross brace 2 and the second cross brace 10 respectively, the second buoy 31 in the second buoy 3 is installed on the second frame, and the second buoy 31 in the third buoy 9 is installed on the third frame.

[0046] In some embodiments, the mooring cable comprises a tension hamstring tendon 7 and the mooring foundation comprises a suction cylinder 8 .

[0047] The tension hamstring tendon 7 is a slow-bonding steel strand to which tension is applied. Combined with the suction cylinder 8, it can better ensure the reliability of the floating foundation staying on the sea surface, and the single-point moored floating offshore wind turbine is less likely to change position in a complex sea surface environment.

[0048] Specifically, Figure 1-Figure 3As shown, there is one suction tube 8, and there are at least two tension hamstrings 7, and all tension hamstrings 7 are arranged adjacent to each other. At this time, when the floating foundation rotates around the tension hamstrings 7, the tension hamstrings 7 exert a smaller reaction force on the floating foundation when they rotate synchronously, and the head 5 can be more reliably opposite to the wind direction, thereby better ensuring the power generation efficiency of the head 5.

[0049] For example, Figure 3 As shown, the number of the tension hamstring tendons 7 is three, and the three tension hamstring tendons 7 are parallel to each other in pairs.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A dual-head offshore floating wind turbine, characterized in that: include: A floating foundation, wherein two towers are provided on the floating foundation, a machine head is installed at the upper end of each tower, and the two machine heads are oriented in the same direction; A mooring assembly, the mooring assembly comprising a mooring cable and a mooring foundation, the mooring cable connecting the floating foundation and the mooring foundation, and the mooring foundation being suitable for being fixed on the seabed; A guide wing is installed above the floating foundation, and the floating foundation is suitable for rotating around the mooring cable under the drive of the guide wing so that the axial direction of the nose is consistent with the wind direction.

2. The dual-head offshore floating wind turbine according to claim 1, characterized in that: The floating foundation comprises: a first floating body, the upper end of the mooring cable being connected to the first floating body; first cross braces, wherein there are two first cross braces, and first ends of the two first cross braces are both connected to the first floating body; The second floating body includes two second floating bodies, the two second floating bodies are respectively connected to the second ends of the two first cross braces, and the two towers are respectively installed on the two second floating bodies.

3. The dual-head offshore floating wind turbine generator set according to claim 2 is characterized in that: The floating foundation further comprises: second cross braces, wherein there are two second cross braces, and first ends of two second cross braces are respectively connected to two second floating bodies; A third floating body is connected to the second ends of the two second cross braces.

4. The dual-head offshore floating wind turbine according to claim 3 is characterized in that: The floating foundation further includes a third cross brace and a fourth cross brace, wherein the third cross brace is connected to the fourth cross brace, two ends of the third cross brace are respectively connected to the two second floating bodies, and two ends of the fourth cross brace are respectively connected to the first floating body and the third floating body.

5. The dual-head offshore floating wind turbine according to any one of claims 2 to 4, characterized in that: The guide vane is provided on a side of each tower tube facing the first floating body. The nose includes a cabin and wind blades. The wind blades are located on a side of the cabin facing away from the first floating body.

6. The dual-head offshore floating wind turbine according to claim 5 is characterized in that: The guide wing is also connected to the first floating body; And / or, the two guide wings are arranged in mirror symmetry, the two towers are arranged in mirror symmetry, each tower is inclined relative to the corresponding second floating body in a direction away from the first floating body, and the distance between the two towers gradually increases from bottom to top.

7. The dual-head offshore floating wind turbine generator set according to claim 2 is characterized in that: The first floating body comprises a first buoy, the outer contour of the first buoy is cylindrical, and the center position of the lower end surface of the first buoy is connected to the upper end of the mooring cable.

8. The dual-head offshore floating wind turbine generator set according to claim 3 is characterized in that: The second buoy and the third buoy both include a heave plate and a second buoy arranged above the heave plate.

9. The dual-head offshore floating wind turbine generator set according to claim 1, characterized in that: The mooring cable comprises a tension hamstring tendon and the mooring foundation comprises a suction cylinder.

10. The dual-head offshore floating wind turbine generator set according to claim 9, characterized in that: The number of the suction cylinder is one, the number of the tension hamstring tendons is at least two, and all the tension hamstring tendons are arranged adjacent to each other in pairs.

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