Double-impeller semi-submersible floating type wind turbine generator

Abstract

The utility model relates to the technical field of offshore wind power generation equipment, and discloses a double-impeller semi-submersible floating type wind turbine generator which comprises a semi-submersible floating type foundation, the whole semi-submersible floating type foundation is of a triangular design, and single-point mooring devices, a lower fan and an upper fan are installed at the triangular positions of the semi-submersible floating type foundation respectively. A mooring anchor cable is installed on the single-point mooring device, and one corner of the semi-submersible floating type foundation is moored and positioned in the ocean through the mooring anchor cable. The double-impeller semi-submersible floating type wind turbine generator solves the problems that in an existing floating type wind turbine generator with double machine heads, in order to keep left-right balance of a foundation, an upper draught fan and a lower draught fan are usually combined, so that a corresponding yaw system needs to be designed for control, the draught fans complete wind alignment, and the wind power generation efficiency is high. Therefore, yaw control of the fan becomes more complex, and popularization and application of the floating type wind turbine generator are not facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power generation equipment, in particular to a double-impeller semi-submersible floating wind turbine set. Background Art

[0002] Actively developing clean energy and promoting green and low-carbon transformation of the economy and society have become a general consensus of the international community in responding to global climate change. Offshore wind power, as an important source of clean energy, can reduce the use of fossil energy and reduce environmental pollution, which is of great significance for responding to global climate change.

[0003] According to research by WindEurope and DNV, 70% of the world's potential offshore wind resources are located in deep waters. Due to its own technical characteristics, floating wind power is an important way to develop deep water wind energy. With the promotion of policies, the maturity of technology and large-scale development, floating offshore wind power will become the main technical route for the development of wind energy in deep waters.

[0004] At present, there is a kind of floating wind turbine with double heads. In order to maintain the left and right balance of the foundation, a combination of an upper wind turbine and a lower wind turbine is often used, that is, the wind rotor of the upwind wind turbine is in front of the tower, and the downwind wind turbine is opposite. Or two upper wind turbines are used, but the two upper wind turbines turn in opposite directions. Therefore, it is necessary to design a corresponding yaw system for control so that the wind turbine can face the wind, which makes the yaw control of the wind turbine more complicated, which is not conducive to the promotion and application of floating wind turbines. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a double-impeller semi-submersible floating wind turbine unit, which solves the problems mentioned in the above background.

[0006] The utility model provides the following technical solution: a double-impeller semi-submersible floating wind turbine unit, comprising: a semi-submersible floating foundation, the semi-submersible floating foundation is designed as a triangle as a whole, a single-point mooring device, a lower wind turbine and an upper wind turbine are respectively installed at the triangles of the semi-submersible floating foundation, a mooring anchor is installed on the single-point mooring device, a corner of the semi-submersible floating foundation is moored and positioned in the ocean by the mooring anchor, and the lower wind turbine and the upper wind turbine are both composed of a tower, a nacelle and an impeller.

[0007] Preferably, the semi-submerged floating foundation comprises a truss support structure, which is a triangular frame structure, wherein columns are provided at the triangular parts of the truss support structure, and heave plates are provided at the bottoms of the columns.

[0008] Preferably, there is an initial angle between the tangent direction of the impellers of the lower fan and the upper fan and the line connecting the lower fan and the upper fan.

[0009] Preferably, there are six mooring anchor cables, and the six mooring anchor cables are distributedly arranged with the single point mooring device as the center point, and one end of the mooring anchor cable away from the single point mooring device is fixed to the seabed by an anchor.

[0010] Preferably, the power transmission wires of the lower wind turbine and the upper wind turbine are all gathered at a single-point mooring device, and a cable is formed at the single-point mooring device to transmit the power to the power grid across the water area.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The double-impeller semi-submersible floating wind turbine unit forms an initial angle on a semi-submersible floating foundation by arranging an upper wind turbine and a lower wind turbine, and then uses a single-point mooring device to position a corner of the semi-submersible floating foundation. For any of the wind turbine impellers, the impeller on the side close to the incoming flow along the wind direction has a larger wind receiving area perpendicular to the incoming flow, while the impeller on the side away from the incoming flow has a smaller wind receiving area perpendicular to the incoming flow, resulting in an unbalanced thrust of the impellers on both sides, thereby generating a yaw force around the vertical axis of the hub center that drives the impeller to face the wind. The yaw moments of the two impellers are superimposed and finally transmitted to the semi-submersible floating foundation through the tower, driving the semi-submersible floating foundation to rotate around the single-point mooring device to achieve yaw facing the wind, thereby achieving an automatic wind facing effect, eliminating the dependence of the floating wind turbine unit on the yaw system, reducing the overall cost and complexity of the floating wind turbine unit, and facilitating the popularization and application of the floating wind turbine unit.

[0013] 2. For this double-impeller semi-submersible floating wind turbine, when the ocean current is large and causes the thrust of the two impellers to be unbalanced, the initial angle between the two impellers makes the impeller on the side away from the incoming flow along the flow direction have a larger wind receiving area perpendicular to the incoming flow, while the impeller on the side close to the incoming flow has a smaller wind receiving area perpendicular to the incoming flow, resulting in unbalanced thrust of the impellers on both sides. The thrust component of the impellers on both sides in the flow direction and the ocean current load can be balanced when the semi-submersible floating foundation is rotated to a certain angle, so that the wind turbine can keep the impeller direction and wind direction basically the same when the ocean current increases, so that the floating wind turbine has excellent automatic wind-facing ability, which can effectively improve its power generation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the top view structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the semi-submerged floating foundation structure of the utility model.

[0017] In the figure: 1. Semi-submerged floating foundation; 11. Truss support structure; 12. Column; 13. Heave plate; 2. Single point mooring device; 3. Downwind turbine; 4. Upwind turbine; 5. Mooring anchor cable. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3 A double-impeller semi-submersible floating wind turbine unit comprises: a semi-submersible floating foundation 1, the semi-submersible floating foundation 1 is designed in a triangular shape as a whole, a single-point mooring device 2, a lower wind turbine 3 and an upper wind turbine 4 are respectively installed at the triangular parts of the semi-submersible floating foundation 1, a mooring anchor cable 5 is installed on the single-point mooring device 2, a corner of the semi-submersible floating foundation 1 is moored and positioned in the ocean by the mooring anchor cable 5, the lower wind turbine 3 and the upper wind turbine 4 are both composed of a tower, a nacelle and an impeller, the single-point mooring device 2 is installed using existing technology, and the single-point mooring device 2 is used to enable the semi-submersible floating foundation 1 to rotate freely around a single point, so that the impeller direction of the wind turbine generator set is basically the same as the wind direction, and a yaw system is no longer required, thereby reducing the overall cost.

[0020] Among them, the semi-submersible floating foundation 1 includes a truss support structure 11, which is a triangular frame structure. Columns 12 are arranged at the triangular parts of the truss support structure 11, and a heave plate 13 is arranged at the bottom of the column 12. The heave plate 13 can increase the hydrodynamic damping and additional mass of the semi-submersible floating foundation 1 and improve the movement performance of the semi-submersible floating foundation 1. Changing the size or shape of the heave plate 13 can effectively change the hydrodynamic damping and additional mass of the semi-submersible floating foundation 1 to adapt to different environments. Therefore, the size and shape of the heave plate 13 can be designed to be circular, square, triangular or the like according to environmental conditions.

[0021] Among them, there is an initial angle between the impeller tangent of the lower fan 3 and the upper fan 4 and the line between the lower fan 3 and the upper fan 4. The initial angle between the lower fan 3 and the upper fan 4 and the line causes the semi-submersible floating foundation 1 to be subjected to unbalanced wind thrust, which is combined with the upward component of the ocean flow and the current load, and the semi-submersible floating foundation 1 is rotated and adjusted to achieve an automatic wind-facing effect.

[0022] There are six mooring anchor cables 5, and the six mooring anchor cables 5 are distributedly arranged with the single point mooring device 2 as the center point. The end of the mooring anchor cable 5 away from the single point mooring device 2 is anchored to the seabed. By utilizing the distributed fixation of the six mooring anchor cables 5, the single point mooring capability with the single point mooring device 2 as the base point is realized, thereby avoiding the displacement of the single point mooring device 2.

[0023] Among them, the power transmission wires of the lower wind turbine 3 and the upper wind turbine 4 are all gathered at the single-point mooring device 2, and a cable is formed at the single-point mooring device 2 to be transmitted across the water area to the power grid. Since the device itself adopts the single-point mooring device 2 for fixed-point setting, the cable is set across the water area with the single-point mooring device 2 as the base point, which can effectively prevent one end of the cable from moving.

[0024] Working principle: by setting the upper wind turbine 4 and the lower wind turbine 3 on the semi-submersible floating foundation 1 to form an initial angle, and then using the single-point mooring device 2 to position one corner of the semi-submersible floating foundation 1, for any of the wind turbine impellers, the impeller on the side close to the incoming flow along the wind direction has a larger wind receiving area perpendicular to the incoming flow, and the impeller on the side away from the incoming flow has a smaller wind receiving area perpendicular to the incoming flow, resulting in an unbalanced thrust of the impellers on both sides, and then generating a yaw force around the vertical axis of the hub center to drive the impeller to face the wind. The yaw moments of the two impellers are superimposed and finally transmitted to the semi-submersible floating foundation 1 through the tower, driving the semi-submersible floating foundation 1 to rotate around the single-point mooring device 2 to achieve yaw facing the wind, thereby achieving the effect of automatic facing the wind;

[0025] When the ocean current is large and causes the thrust of the two impellers to be unbalanced, the initial angle between the two impellers causes the impeller on the side away from the incoming flow to have a larger wind receiving area perpendicular to the incoming flow, while the impeller on the side close to the incoming flow has a smaller wind receiving area perpendicular to the incoming flow, resulting in an unbalanced thrust of the impellers on both sides. The thrust components of the impellers on both sides in the flow direction and the ocean current load can be balanced when the semi-submerged floating foundation 1 is rotated to a certain angle, thereby allowing the wind turbine to maintain basically the same impeller direction and wind direction when the ocean current increases, so that the floating wind turbine has excellent automatic wind-facing capability.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-impeller semi-submersible floating wind turbine, characterized in that: include: A semi-submersible floating foundation (1), wherein the semi-submersible floating foundation (1) is designed in a triangular shape as a whole, and a single-point mooring device (2), a lower wind turbine (3) and an upper wind turbine (4) are respectively installed at the triangular parts of the semi-submersible floating foundation (1), and a mooring anchor cable (5) is installed on the single-point mooring device (2). One corner of the semi-submersible floating foundation (1) is moored and positioned in the ocean by the mooring anchor cable (5), and the lower wind turbine (3) and the upper wind turbine (4) are both composed of a tower, a nacelle and an impeller.

2. A double-impeller semi-submersible floating wind turbine according to claim 1, characterized in that: The semi-submerged floating foundation (1) comprises a truss support structure (11), wherein the truss support structure (11) is a triangular frame structure, wherein columns (12) are arranged at the triangular parts of the truss support structure (11), and a heave plate (13) is arranged at the bottom of the column (12).

3. A double-impeller semi-submersible floating wind turbine according to claim 1, characterized in that: There is an initial angle between the tangent direction of the impellers of the lower fan (3) and the upper fan (4) and the line connecting the lower fan (3) and the upper fan (4).

4. A double-impeller semi-submersible floating wind turbine according to claim 1, characterized in that: There are six mooring anchor cables (5), and the six mooring anchor cables (5) are distributedly arranged with the single-point mooring device (2) as the center point. One end of the mooring anchor cable (5) away from the single-point mooring device (2) is fixed to the seabed by an anchor.

5. A double-impeller semi-submersible floating wind turbine according to claim 1, characterized in that: The power transmission wires of the lower wind turbine (3) and the upper wind turbine (4) are all gathered at the single-point mooring device (2), and a cable is formed at the single-point mooring device (2) to transmit the power across the water area to the power grid.

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