Offshore wind generating set and control method therefor

Abstract

An offshore wind generating set, comprising: a support foundation (10); a plurality of towers (20) arranged on the support foundation (10); a plurality of rotor mechanisms (30) having one-to-one correspondence to the plurality of towers (20), wherein the plurality of rotor mechanisms (30) are arranged in multiple rows, the rotor mechanisms (30) in every two adjacent rows are arranged in a staggered manner, each rotor mechanism (30) comprises a front rotor (31) and a rear rotor (32), and the diameter of the front rotor (31) is greater than that of the rear rotor (32); and a plurality of yawing mechanisms (40), wherein one yawing mechanism (40) is arranged between each tower (20) and the support foundation (10). The technical solution can improve the wind energy utilization efficiency of offshore wind generating sets. In addition, the present invention further relates to a control method for the offshore wind generating set.

Description

Offshore wind turbine generator set and control method thereof Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore wind turbine generator set and a control method thereof. Background Art

[0002] Among related technologies, offshore wind power generation devices are capable of developing offshore wind energy resources and are a highly promising development direction in the field of future power generation technology.

[0003] At present, an offshore wind power generation device generally includes a supporting foundation and a wind rotor structure arranged on the supporting foundation. In order to maximize the use of offshore wind energy for power generation, multiple offshore wind power generation devices are generally arranged in a sea area according to a certain pattern.

[0004] However, the offshore wind power generation devices and the power generation arrays formed by the offshore wind power generation devices in the related art do not have an ideal utilization efficiency of offshore wind energy. Technical issues

[0005] The main purpose of the present invention is to provide an offshore wind turbine generator set and a control method thereof, so as to solve the problem in the related art that the wind energy utilization efficiency of offshore wind turbines is not ideal. Technical Solutions

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an offshore wind turbine generator set, comprising: a supporting foundation; a plurality of towers, arranged on the supporting foundation; a plurality of wind rotor mechanisms, arranged in one-to-one correspondence with the plurality of towers, the plurality of wind rotor mechanisms being arranged in multiple rows, the wind rotor mechanisms in each two adjacent rows being staggered, each wind rotor mechanism comprising a front wind rotor and a rear wind rotor, the diameter of the front wind rotor being larger than the diameter of the rear wind rotor; a plurality of yaw mechanisms, a yaw mechanism being arranged between each tower and the supporting foundation.

[0007] Furthermore, the plurality of towers located on the outermost sides define a regular polygonal structure.

[0008] Furthermore, in each wind wheel mechanism, the axis of the front wind wheel and the axis of the rear wind wheel are arranged at the same height, and the diameter D of the front wind wheel and the diameter d of the rear wind wheel satisfy: d = (0.75~0.85) × D; and / or, each wind wheel mechanism has a circular projection range on the horizontal plane, the projection of the wind wheel mechanism on the horizontal plane completely falls within the circular projection range, and the center distance l of the two circular projection ranges of two adjacent wind wheel mechanisms and the radius r of the circular projection range satisfy: l>2.4r.

[0009] According to another aspect of the present invention, a control method for an offshore wind turbine generator set is provided, wherein the offshore wind turbine generator set is the offshore wind turbine generator set described above, and the control method comprises:

[0010] Step S10: Obtaining ambient wind direction information;

[0011] Step S30: controlling the rotation of the multiple towers according to the wind direction information to drive the rotation of the multiple wind rotor mechanisms.

[0012] Furthermore, the number of towers and the number of wind rotor mechanisms are both three, and the three wind rotor mechanisms are respectively located at the three corners of the equilateral triangle. The three wind rotor mechanisms include a first wind rotor mechanism located at the first corner of the equilateral triangle, a second wind rotor mechanism located at the second corner of the equilateral triangle, and a third wind rotor mechanism located at the third corner of the equilateral triangle. Step S30 includes: when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the first direction, controlling the first wind rotor mechanism to face the ambient wind, and controlling the second wind rotor mechanism and the third wind rotor mechanism to tilt toward the center of the equilateral triangle, wherein the first direction is the direction from the first corner of the equilateral triangle to the center of the equilateral triangle; when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the second direction, controlling the second wind rotor mechanism to face the ambient wind, and controlling the first wind rotor mechanism to tilt toward the center of the equilateral triangle. The wheel mechanism and the third wind wheel mechanism are inclined toward the center of the equilateral triangle, wherein the second direction is the direction from the second corner of the equilateral triangle to the center of the equilateral triangle; when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the third direction between the first direction and the second direction, each wind wheel mechanism is controlled to move to a working position, and in the working position, a first angle A is formed between the vertical line of the wind wheel mechanism and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the first direction, a second angle B is formed between the vertical line of the wind wheel mechanism and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the first direction, and a third angle C is formed between the third direction and the first direction, wherein the first angle A, the second angle B and the third angle C satisfy: A / B=C / 120°.

[0013] Further, when the wind direction information satisfies that the direction of the ambient wind is parallel to the first direction, the second wind wheel mechanism is controlled to move to a position where the angle between the vertical line and the first direction is between 5° and 15°, and the third wind wheel mechanism is controlled to move to a position where the angle between the vertical line and the first direction is between 5° and 15°; and / or, when the wind direction information satisfies that the direction of the ambient wind is parallel to the second direction, the first wind wheel mechanism is controlled to move to a position where the angle between the vertical line and the second direction is between 5° and 15°, and the third wind wheel mechanism is controlled to move to a position where the angle between the vertical line and the second direction is between 5° and 15°.

[0014] Furthermore, the number of towers and the number of wind rotor mechanisms are both seven, of which six wind rotor mechanisms are respectively located at the six corners of the regular hexagon, and the seventh wind rotor mechanism is located at the center of the regular hexagon. The six wind rotor mechanisms include a fourth wind rotor mechanism located at the first corner of the regular hexagon, a fifth wind rotor mechanism located at the second corner of the regular hexagon, a sixth wind rotor mechanism located at the third corner of the regular hexagon, a seventh wind rotor mechanism located at the fourth corner of the regular hexagon, an eighth wind rotor mechanism located at the fifth corner of the regular hexagon, and a ninth wind rotor mechanism located at the sixth corner of the regular hexagon. The seventh wind turbine The tenth wind rotor mechanism is configured, wherein the first corner, the second corner, the third corner, the fourth corner, the fifth corner and the sixth corner of the regular hexagon are sequentially arranged along the circumferential direction of the regular hexagon, and step S30 comprises: when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fourth direction, controlling the fourth wind rotor mechanism and the fifth wind rotor mechanism to tilt toward the center of the line connecting the first corner and the second corner of the regular hexagon, controlling the tenth wind rotor mechanism to face the ambient wind, and controlling the sixth wind rotor mechanism, the seventh wind rotor mechanism, the eighth wind rotor mechanism and the ninth wind rotor mechanism to tilt toward the tenth wind rotor mechanism, wherein the fourth direction is from the positive The direction from the center of the line connecting the first corner and the second corner of the hexagon to the center of the regular hexagon; when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fifth direction, the fifth wind rotor mechanism and the sixth wind rotor mechanism are controlled to tilt toward the center of the line connecting the second corner and the third corner of the regular hexagon, the tenth wind rotor mechanism is controlled to face the ambient wind, and the seventh wind rotor mechanism, the eighth wind rotor mechanism, the ninth wind rotor mechanism and the fourth wind rotor mechanism are controlled to tilt toward the tenth wind rotor mechanism, wherein the fifth direction is the direction from the center of the line connecting the second corner and the third corner of the regular hexagon to the center of the regular hexagon; when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fifth direction, the fifth wind rotor mechanism and the sixth wind rotor mechanism are controlled to tilt toward the center of the line connecting the second corner and the third corner of the regular hexagon When the wind direction of the ambient wind is parallel to the sixth direction between the fourth direction and the fifth direction, each wind wheel mechanism is controlled to move to a working position. In the working position, a fourth angle D is formed between the vertical line of the wind wheel mechanism and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the fourth direction. A fifth angle E is formed between the vertical line of the wind wheel mechanism and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the fourth direction. A sixth angle F is formed between the sixth direction and the fourth direction. The fourth angle D, the fifth angle E and the sixth angle F satisfy: D / E=F / 60°.

[0015] Furthermore, when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fourth direction, the fourth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 2.5° and 7.5°, the fifth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 2.5° and 7.5°, the seventh wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 2.5° and 7.5°, the eighth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 2.5° and 7.5°, the sixth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 5° and 15°, and the ninth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fourth direction is between 5° and 15°. ; and / or, when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fifth direction, the fifth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 2.5° and 7.5°, the sixth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 2.5° and 7.5°, the eighth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 2.5° and 7.5°, the ninth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 2.5° and 7.5°, the seventh wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 5° and 15°, and the fourth wind rotor mechanism is controlled to move to a position where the angle between the vertical line and the fifth direction is between 5° and 15°.

[0016] Further, step S30 is performed once after each step S10 is performed for a preset time period, wherein the preset time period is between 8 minutes and 12 minutes; and / or, in step S10, the wind direction information is the average wind direction information within the preset time period.

[0017] Furthermore, after each step S10 is executed for a preset time period, the control method further includes:

[0018] Step S20: Determine whether the angle difference between the current wind direction information and the previous wind direction information is greater than the preset angle difference. When the angle difference is greater than the preset angle difference, stop the machine for manual maintenance; when the angle difference is less than the preset angle difference, execute step S30.

[0019] Furthermore, step S10 further includes:

[0020] Obtain rotor orientation information of offshore wind turbines;

[0021] Step S30 includes:

[0022] Step S31: Calculating the rotation angle of each wind rotor mechanism according to the wind rotor orientation information and the wind direction information;

[0023] Step S32: Control the tower to rotate to drive the corresponding wind rotor mechanism to rotate. When the rotation angle of the wind rotor mechanism is greater than the preset angle, control the tower to rotate at the first speed first and then at the second speed; when the rotation angle of the wind rotor mechanism is less than the preset angle, control the tower to rotate at the second speed, wherein the first speed is greater than the second speed.

[0024] Furthermore, the preset angle is in the range of 0.5° to 1.5°, the first speed is between 0.5° / s and 0.7° / s, and the second speed is between 0.08° / s and 0.12° / s; and / or, when the rotation angle of the wind wheel mechanism is greater than the preset angle, the tower is first controlled to rotate at the first speed until the angle to be rotated of the wind wheel mechanism is equal to or less than the preset angle, and then the tower is controlled to rotate at the second speed. Beneficial effects

[0025] Using the technical solution of the present invention, a support base serves as the mounting base for an offshore wind turbine generator set, and the tower, rotor mechanism, and yaw mechanism are all mounted on the support base. Multiple towers and multiple rotor mechanisms corresponding to the multiple towers are arranged on a single support base. The multiple rotor mechanisms are staggered so that the rotor mechanism in the rear row can utilize the wind energy in the gap between the two rotor mechanisms in the front row. Each rotor mechanism includes a front rotor with a relatively large diameter and a rear rotor with a relatively small diameter. The front rotor is the windward rotor, and wind passes through the front rotor first before passing through the rear rotor. The rear rotor can capture and utilize the remaining wind energy from the front rotor, achieving cascaded utilization of wind energy and improving the wind energy utilization efficiency of a single offshore wind turbine generator set. In addition, a yaw mechanism is provided between each tower and the support base. The yaw mechanism can drive the tower to rotate, thereby driving the rotor mechanism to rotate in accordance with the wind direction changes, further improving wind energy utilization efficiency. Therefore, the technical solution of the present application can effectively solve the problem of unsatisfactory wind energy utilization efficiency of offshore wind turbines in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] FIG1 shows a schematic perspective structural diagram of a first embodiment of an offshore wind turbine generator set according to the present invention; and

[0028] FIG2 shows an enlarged view of a portion of the structure of the offshore wind turbine generator set in FIG1 ;

[0029] FIG3 shows a schematic top view of the offshore wind turbine generator set of FIG1 ;

[0030] FIG4 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG1 when the direction of the ambient wind is parallel to the first direction;

[0031] FIG5 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG1 when the direction of the ambient wind is parallel to the second direction;

[0032] FIG6 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG1 when the direction of the ambient wind is parallel to the third direction;

[0033] FIG7 shows a schematic top view of a second embodiment of an offshore wind turbine generator set according to the present invention;

[0034] FIG8 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG7 when the direction of the ambient wind is parallel to the fourth direction;

[0035] FIG9 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG7 when the direction of the ambient wind is parallel to the fifth direction;

[0036] FIG10 shows the orientation of each wind rotor mechanism of the offshore wind turbine generator set of FIG7 when the direction of the ambient wind is parallel to the sixth direction;

[0037] FIG11 shows a flow chart of a method for controlling an offshore wind turbine generator system according to the present invention.

[0038] The above drawings include the following reference numerals:

[0039] 10. Support foundation;

[0040] 20. Tower;

[0041] 30. Wind rotor mechanism; 31. Front wind rotor; 32. Rear wind rotor; 33. V-shaped bracket; 300. Circular projection range; 301. First wind rotor mechanism; 302. Second wind rotor mechanism; 303. Third wind rotor mechanism; 304. Fourth wind rotor mechanism; 305. Fifth wind rotor mechanism; 306. Sixth wind rotor mechanism; 307. Seventh wind rotor mechanism; 308. Eighth wind rotor mechanism; 309. Ninth wind rotor mechanism; 310. Tenth wind rotor mechanism;

[0042] 40. Yaw mechanism;

[0043] 50. Mooring line;

[0044] l, the center distance between the two circular projections of two adjacent wind wheel mechanisms; r, the radius of the circular projection;

[0045] A, first angle; B, second angle; C, third angle; D, fourth angle; E, fifth angle; F, sixth angle;

[0046] a, first direction; b, second direction; c, third direction; d, fourth direction; e, fifth direction; f, sixth direction. Modes for Carrying Out the Invention

[0047] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] As shown in Figures 1 to 10, the present application provides an offshore wind turbine generator set. An embodiment of the offshore wind turbine generator set of the present application includes: a supporting base 10, multiple towers 20, multiple wind rotor mechanisms 30, and multiple yaw mechanisms 40. The multiple towers 20 are disposed on the supporting base 10; the multiple wind rotor mechanisms 30 are disposed in a one-to-one correspondence with the multiple towers 20. The multiple wind rotor mechanisms 30 are disposed in multiple rows, with the wind rotor mechanisms 30 in each two adjacent rows being staggered. Each wind rotor mechanism 30 includes a front wind rotor 31 and a rear wind rotor 32, with the diameter of the front wind rotor 31 being larger than the diameter of the rear wind rotor 32; and a yaw mechanism 40 is disposed between each tower 20 and the supporting base 10.

[0051] Applying the technical solution of this embodiment, the support base 10 serves as the mounting base of the offshore wind turbine generator set, and the tower 20, the wind rotor mechanism 30, and the yaw mechanism 40 are all mounted on the support base 10. Multiple towers 20 and multiple wind rotor mechanisms 30 corresponding to the multiple towers 20 are arranged on a single support base 10. The multiple wind rotor mechanisms 30 are staggered so that the wind rotor mechanisms 30 in the rear row can utilize the wind energy corresponding to the gap between the two wind rotor mechanisms 30 in the front row. Each wind rotor mechanism 30 includes a front wind rotor 31 with a relatively large diameter and a rear wind rotor 32 with a relatively small diameter. The front wind rotor 31 is the windward wind rotor, and the wind first passes through the front wind rotor 31 and then through the rear wind rotor 32. The rear wind rotor 32 can capture and utilize the remaining wind energy of the front wind rotor 31, thereby achieving cascaded utilization of wind energy and improving the wind energy utilization efficiency of a single offshore wind turbine generator set. Furthermore, a yaw mechanism 40 is provided between each tower 20 and the support base 10. This yaw mechanism 40 drives the tower 20 to rotate, thereby driving the rotor mechanism 30 to rotate in response to changes in the ambient wind direction, further improving wind energy utilization efficiency. Therefore, the technical solution of this embodiment effectively addresses the problem of suboptimal wind energy utilization efficiency in offshore wind turbines in related technologies.

[0052] Specifically, the tower 20 is fixedly connected to the wind rotor mechanism 30. The yaw mechanism 40 is a prior art in the art, and its specific structural composition and the connection and coordination relationship between the various structures will not be described in detail.

[0053] In the prior art, only one rotor is installed above each tower. Given the same unit capacity and wind-catching rotor area, this application uses two small rotors (i.e., front rotor 31 and rear rotor 32) instead of the single large rotor used in the prior art. This effectively reduces the tower height (specifically, the height from the lowest end of the support base 10 to the axis of the rotor of the rotor mechanism 30) and lowers the center of gravity. For example, a 100m diameter rotor consisting of 50m-long blades can be replaced with one rotor with 40m blades and one with 30m blades. The tower height can be reduced from 55m to 45m, with 5m representing the height of the support base, which prevents the blade tips from scraping against it.

[0054] As shown in Figures 3 and 7 , the outermost towers 20 define a regular polygonal structure. The yaw mechanism 40 drives the multiple rotor mechanisms 30 to rotate in response to changes in the ambient wind direction. The multiple rotor mechanisms 30 are arranged in a regular polygonal pattern, resulting in a periodic arrangement around the circumference of the offshore wind turbine. Each cycle utilizes the same yaw control procedure (described in detail in the control method below), facilitating yaw control of the multiple rotor mechanisms 30.

[0055] As shown in Figure 1, in each wind rotor mechanism 30, the axes of the front and rear rotors 31 and 32 are arranged at the same height. The relationship between the diameter D of the front and rear rotors 31 and 32 satisfies the following relationship: d = (0.75-0.85) × D. "The axes of the front and rear rotors 31 and 32 are arranged at the same height" means that they lie in the same horizontal plane in the spatial coordinate system. Maintaining this relationship between the diameters D of the front and rear rotors 31 and 32 maximizes wind energy capture efficiency and ensures cost-effectiveness. If the diameter of the rear rotor 32 is too small, the cost is lower, but the wind energy capture efficiency decreases. If the diameter of the rear rotor 32 is too large, the wind energy capture efficiency increases, but the cost is too high. Preferably, d can be equal to 0.75D, 0.8D, or 0.85D.

[0056] Specifically, the above-mentioned "diameter D of the front wind wheel 31" refers to the diameter of the circular range covered when the front wind wheel 31 rotates around its axis, and the above-mentioned "diameter d of the rear wind wheel 32" refers to the diameter of the circular range covered when the rear wind wheel 32 rotates around its axis.

[0057] As shown in Figures 3 and 7 , each wind rotor mechanism 30 has a circular projection 300 on a horizontal plane. The projection of the wind rotor mechanism 30 on the horizontal plane completely falls within the circular projection 300. The center-to-center distance l between the circular projections 300 of two adjacent wind rotor mechanisms 30 and the radius r of the circular projection 300 satisfy the following relationship: l > 2.4r. The aforementioned "circular projection 300" refers to the circular area formed by the axis of the tower 20 corresponding to the wind rotor mechanism 30 as the center and the distance from the outermost end of one of the blades of the wind rotor 31 to the axis of the tower 20 when the blade is in a horizontal position as the radius. This relationship between the center-to-center distance l between the circular projections 300 of two adjacent wind rotor mechanisms 30 and the radius r of the circular projection 300 allows for a compact arrangement of multiple wind rotor mechanisms 30 in an offshore wind turbine generator system while also preventing interference between the wind rotor mechanisms 30.

[0058] The offshore wind turbine generator set provided in this application is a floating offshore wind turbine generator set. The support foundation 10 includes multiple floating columns, each of which is provided with a tower 20. The yaw mechanism 40 is provided between the floating columns and the tower 20. The offshore wind turbine generator set also includes a mooring cable 50 connected between the seabed anchoring structure and the floating columns. The wind rotor mechanism 30 also includes a V-shaped bracket 33, the lower end of which is fixedly connected to the upper end of the tower 20. The front wind rotor 31 and the rear wind rotor 32 are respectively provided with the upper ends of the V-shaped bracket 33, and the axes of the front wind rotor 31 and the rear wind rotor 32 are parallel.

[0059] The cost of floating offshore wind turbines has always been a significant factor restricting their development. The tower and rotor structure account for approximately 20% of the cost, the supporting foundation 40%, the mooring cables 20%, construction 15%, and the remaining 5% is comprised of dynamic submarine cables and accessories. Reducing the cost per kilowatt of floating offshore wind turbines is a pressing issue in this field.

[0060] Applying the technical solution of this embodiment, the cost of the tower 20 and rotor mechanism 30 is 20% × 3 (three times the previous cost), the supporting foundation accounts for 40% × 2 (twice the previous cost), the mooring cables account for 20% × 2 (twice the previous cost), construction accounts for 15% (basically the same as before), and the remaining 5% is for dynamic submarine cables, accessories, etc. (basically the same as before). This can reduce the cost per kW by approximately 1-1.8 / 3 = 20%.

[0061] As shown in FIG11 , the present application further provides a control method for an offshore wind turbine generator set, wherein the offshore wind turbine generator set is the offshore wind turbine generator set described above. An embodiment of the control method of the present application includes:

[0062] Step S10: Obtaining ambient wind direction information;

[0063] Step S30: controlling the multiple towers 20 to rotate according to the wind direction information to drive the multiple wind wheel mechanisms 30 to rotate.

[0064] The above-mentioned offshore wind turbine generator set can effectively solve the problem of unsatisfactory wind energy utilization efficiency of offshore wind power generation devices in related technologies. The control method of this embodiment is used to control the above-mentioned offshore wind turbine generator set to yaw (yaw refers to the rotation of the wind wheel mechanism 30 following the change of wind direction information), which also has the above-mentioned advantages.

[0065] FIG3 to FIG6 are schematic structural diagrams of a first embodiment of an offshore wind turbine generator set according to the present application (FIGS. 4 to 6 are primarily intended to illustrate the orientations of the wind rotor mechanisms 30 in different wind directions, and therefore, the specific structures of the wind rotor mechanisms 30 are simplified). There are three towers 20 and three wind rotor mechanisms 30, respectively located at three corners of an equilateral triangle. The three wind rotor mechanisms 30 include a first wind rotor mechanism 301 located at a first corner of the equilateral triangle, a second wind rotor mechanism 302 located at a second corner of the equilateral triangle, and a third wind rotor mechanism 303 located at a third corner of the equilateral triangle. For the offshore wind turbine generator set of the first embodiment, step S30 includes:

[0066] When the wind direction information satisfies that the direction of the ambient wind is parallel to the first direction a, the first wind rotor mechanism 301 is controlled to face the ambient wind, and the second wind rotor mechanism 302 and the third wind rotor mechanism 303 are controlled to tilt toward the center of the equilateral triangle, wherein the first direction a is the direction from the first corner of the equilateral triangle to the center of the equilateral triangle;

[0067] When the wind direction information satisfies that the wind direction of the ambient wind is parallel to the second direction b, the second wind rotor mechanism 302 is controlled to face the ambient wind, and the first wind rotor mechanism 301 and the third wind rotor mechanism 303 are controlled to tilt toward the center of the equilateral triangle, wherein the second direction b is the direction from the second corner of the equilateral triangle to the center of the equilateral triangle;

[0068] When the wind direction information satisfies that the direction of the ambient wind is parallel to the third direction c between the first direction a and the second direction b, each wind wheel mechanism 30 is controlled to move to the working position. In the working position, there is a first angle A between the vertical line of the wind wheel mechanism 30 and the vertical line of the wind wheel mechanism 30 when the wind direction of the ambient wind is parallel to the first direction a, a second angle B between the vertical line of the wind wheel mechanism and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the first direction a, and a third angle C between the third direction c and the first direction a, wherein the first angle A, the second angle B and the third angle C satisfy: A / B=C / 120°.

[0069] Specifically, the first direction a is the vertical direction from bottom to top in Figure 4, the lower corner of the equilateral triangle is the first corner, the right corner is the second corner, and the left corner is the third corner. At this time, the first wind rotor mechanism 301 is facing the ambient wind, so that the wind energy can be utilized as much as possible. When the wind passes through the first wind rotor mechanism 301, the wind flow direction will be deflected to the outside (that is, the upper left direction and the upper right direction in Figure 4) under the influence of the first wind rotor mechanism 301, so that the second wind rotor mechanism 302 and the third wind rotor mechanism 303 are both tilted toward the center of the side triangle, so that the orientation of the second wind rotor mechanism 302 and the third wind rotor mechanism 303 can adapt to the wind after the direction is deflected, thereby maximizing the overall wind energy received by the three wind rotor mechanisms 30. In addition, at this time, the first wind rotor mechanism 301 can perform a certain amount of propeller movement to leave more wind energy to the second wind rotor mechanism 302 and the third wind rotor mechanism 303 on the rear side, ultimately achieving the highest overall power generation efficiency, that is, maximizing P=p1+p2+p3, where P is the overall power generation efficiency of the offshore wind turbine generator set, p1 is the power generation efficiency of the first wind rotor mechanism 301, p2 is the power generation efficiency of the second wind rotor mechanism 302, and p3 is the power generation efficiency of the third wind rotor mechanism 303.

[0070] It should be noted that the straight arrow marked with "a" in Figure 4 refers to the first direction, that is, the flow direction when the ambient wind has not touched the offshore wind turbine generator set, which is also the information that needs to be obtained in the step of "obtaining wind direction information of ambient wind"; the curved arrow in Figure 4 refers to the wind direction after the wind flows through at least one wind wheel mechanism 30. Since the wind wheel mechanism 30 located on the front side will have a certain influence on the wind direction, the wind direction will be deflected relative to the first direction a. The step of "obtaining wind direction information of ambient wind" does not need to pay attention to the wind direction information after the deflection.

[0071] The second direction b is the direction from the upper right side to the lower left side in FIG. 5 , which is parallel to the direction of the ambient wind and is similar to the first direction. This setting can maximize the overall wind energy received by the three wind wheel mechanisms 30 .

[0072] As shown in Figures 4 to 6, the third direction c lies between the first direction a and the second direction b. As the ambient wind changes direction counterclockwise, it sequentially passes through the first direction a, the third direction c, and the second direction b. In Figure 6, the first wind rotor mechanism 301 (a) illustrates the posture of the first wind rotor mechanism 301 when the ambient wind direction is parallel to the first direction a; the first wind rotor mechanism 301 (b) illustrates the posture of the first wind rotor mechanism 301 when the ambient wind direction is parallel to the second direction b; and the first wind rotor mechanism 301 (c) illustrates the posture of the first wind rotor mechanism 301 when the ambient wind direction is parallel to the third direction c. When the ambient wind changes from the first direction a to any direction between the first direction a and the second direction b, the orientation of each wind rotor mechanism 30 changes linearly, satisfying A / B = C / 120°. This maximizes the overall wind energy received by the three wind rotor mechanisms 30, while simplifying the control process.

[0073] The above only describes the orientation control of each wind wheel mechanism 30 when the ambient wind changes within a range of 120° in the circumferential direction of the offshore wind turbine generator set. When the wind direction of the ambient wind is within another range of 240°, its control principle is similar to the control principle between the first direction a and the second direction b, and will not be repeated here.

[0074] As shown in Figure 4, when the wind direction information satisfies that the direction of the ambient wind is parallel to the first direction a, the second wind rotor mechanism 302 is controlled to move to a position where the angle between the vertical line and the first direction a is between 5° and 15°, and the third wind rotor mechanism 303 is controlled to move to a position where the angle between the vertical line and the first direction a is between 5° and 15°; the orientations of the second wind rotor mechanism 302 and the third wind rotor mechanism 303 are made to meet the above conditions. On the one hand, each wind rotor mechanism 30 is made to face the ambient wind as directly as possible or to be at only a small angle to the ambient wind. On the other hand, the orientation of the wind rotor mechanism 30 at the rear can be adapted to the direction of the wind whose flow direction is affected by the wind rotor mechanism 30 in front, thereby maximizing the overall wind energy received by the three wind rotor mechanisms 30 as much as possible, thereby ensuring the efficiency of wind energy utilization. Specifically, when wind energy passes through the first wind rotor mechanism 301, it changes direction at an angle between 5° and 15°. Therefore, the second wind rotor mechanism 302 and the third wind rotor mechanism 303 are deflected by 5° to 15° relative to the first wind rotor mechanism 301, so that the rear wind rotor mechanisms (i.e., the second wind rotor mechanism 302 and the third wind rotor mechanism 303) can face the wind at the optimal angle, thereby avoiding wasting wind energy. In specific implementations, the deflection angle of wind energy after passing through the first wind rotor mechanism 301 depends on the size of the first wind rotor mechanism 301, the spacing between adjacent wind rotor mechanisms, and the ambient wind velocity. Based on actual site conditions, personnel can select a deflection angle between 5° and 15° for the rear wind rotor mechanism relative to the front wind rotor mechanism, for example, 5°, 10°, or 15°.

[0075] Similarly, as shown in Figure 5, when the wind direction information satisfies that the direction of the ambient wind is parallel to the second direction b, the first wind wheel mechanism 301 is controlled to move to a position where the angle between the vertical line and the second direction b is between 5° and 15°, and the third wind wheel mechanism 303 is controlled to move to a position where the angle between the vertical line and the second direction b is between 5° and 15°.

[0076] Figures 7 to 10 show schematic structural diagrams of a second embodiment of an offshore wind turbine generator set according to the present application (Figures 8 to 10 are mainly for illustrating the orientations of the wind rotor mechanisms 30 in different wind directions, and therefore, the specific structures of the wind rotor mechanisms 30 are simplified). In particular, the number of towers 20 and the number of wind rotor mechanisms 30 are both seven, of which six wind rotor mechanisms 30 are respectively located at the six corners of a regular hexagon, the seventh wind rotor mechanism 30 is located at the center of the regular hexagon, and the six wind rotor mechanisms 30 include a fourth wind rotor mechanism 304 located at the first corner of the regular hexagon, a seventh wind rotor mechanism 30 located at the second corner of the regular hexagon, and a sixth wind rotor mechanism 305 located at the second corner of the regular hexagon. The fifth wind rotor mechanism 305 located at the third corner of the regular hexagon, the sixth wind rotor mechanism 306 located at the third corner of the regular hexagon, the seventh wind rotor mechanism 307 located at the fourth corner of the regular hexagon, the eighth wind rotor mechanism 308 located at the fifth corner of the regular hexagon, and the ninth wind rotor mechanism 309 located at the sixth corner of the regular hexagon, the seventh wind rotor mechanism 30 forms a tenth wind rotor mechanism 310, wherein the first corner, the second corner, the third corner, the fourth corner, the fifth corner, and the sixth corner of the regular hexagon are arranged in sequence along the circumferential direction of the regular hexagon. For the offshore wind turbine generator set of the second embodiment, step S30 includes:

[0077] When the wind direction information satisfies that the direction of the ambient wind is parallel to the fourth direction d, the fourth wind rotor mechanism 304 and the fifth wind rotor mechanism 305 are controlled to tilt toward the center of the line connecting the first corner and the second corner of the regular hexagon, the tenth wind rotor mechanism 310 is controlled to face the ambient wind, and the sixth wind rotor mechanism 306, the seventh wind rotor mechanism 307, the eighth wind rotor mechanism 308, and the ninth wind rotor mechanism 309 are controlled to tilt toward the tenth wind rotor mechanism 310. The fourth direction d is the direction from the center of the line connecting the first corner and the second corner of the regular hexagon to the center of the regular hexagon.

[0078] When the wind direction information satisfies that the direction of the ambient wind is parallel to the fifth direction e, the fifth wind rotor mechanism 305 and the sixth wind rotor mechanism 306 are controlled to tilt toward the center of the line connecting the second corner and the third corner of the regular hexagon, the tenth wind rotor mechanism 310 is controlled to face the ambient wind, and the seventh wind rotor mechanism 307, the eighth wind rotor mechanism 308, the ninth wind rotor mechanism 309, and the fourth wind rotor mechanism 304 are controlled to tilt toward the tenth wind rotor mechanism 310. The fifth direction e is the direction from the center of the line connecting the second corner and the third corner of the regular hexagon to the center of the regular hexagon.

[0079] When the wind direction information satisfies that the direction of the ambient wind is parallel to the sixth direction f between the fourth direction d and the fifth direction e, each wind wheel mechanism 30 is controlled to move to the working position. In the working position, when the vertical line of the wind wheel mechanism 30 is parallel to the fourth direction d of the ambient wind, there is a fourth angle D between the vertical line of the wind wheel mechanism 30. When the direction of the ambient wind is parallel to the fourth direction d, there is a fifth angle E between the vertical line of the wind wheel mechanism 30 and the vertical line of the ambient wind is parallel to the fifth direction e. There is a sixth angle F between the sixth direction f and the fourth direction d, wherein the fourth angle D, the fifth angle E and the sixth angle F satisfy: D / E=F / 60°.

[0080] Specifically, the fourth direction d is the vertical direction from top to bottom in Figure 8. The corners of the regular hexagon are the fourth corner, the fifth corner, the sixth corner, the seventh corner, the eighth corner and the ninth corner in a clockwise direction from the upper left corner. At this time, except for the tenth wind wheel mechanism 310 facing the ambient wind, the remaining wind wheel mechanisms 30 are all tilted toward the vertical center line of the regular hexagon in Figure 8, which plays a role in guiding more wind into the interior of the regular hexagon. In addition, the orientation of each wind wheel mechanism 30 also takes into account the deflection problem of wind when passing through the wind wheel mechanism 30, so that the wind wheel mechanism 30 located at the rear can better receive the wind whose direction has changed after passing through the wind wheel mechanism 30 in the front, thereby maximizing the overall wind energy received by the seven wind wheel mechanisms 30.

[0081] It should be noted that the straight arrow marked with "d" in Figure 8 refers to the fourth direction, that is, the flow direction when the ambient wind has not touched the offshore wind turbine generator set, which is also the information that needs to be obtained in the step of "obtaining wind direction information of ambient wind"; the curved arrow in Figure 8 refers to the wind direction after the wind flows through at least one wind wheel mechanism 30. Since the wind wheel mechanism 30 located on the front side will have a certain influence on the wind direction, the wind direction will be deflected relative to the fourth direction d at this time. The step of "obtaining wind direction information of ambient wind" does not need to pay attention to the wind direction information after the deflection.

[0082] The fifth direction e is the direction from the upper right side to the lower left side in FIG. 9 , which is parallel to the direction of the ambient wind and is similar to the fourth direction d. This setting can maximize the overall wind energy received by the seven wind wheel mechanisms 30 .

[0083] As shown in Figures 8 and 10, the sixth direction f lies between the fourth direction d and the fifth direction e. As the ambient wind changes direction clockwise, it sequentially passes through the fourth direction d, the fifth direction e, and the sixth direction f. In Figure 10, the tenth wind rotor mechanism 310 (d) illustrates the posture of the tenth wind rotor mechanism 310 when the ambient wind direction is parallel to the fourth direction d; the tenth wind rotor mechanism 310 (e) illustrates the posture of the tenth wind rotor mechanism 310 when the ambient wind direction is parallel to the fifth direction e; and the tenth wind rotor mechanism 310 (f) illustrates the posture of the tenth wind rotor mechanism 310 when the ambient wind direction is parallel to the sixth direction f. When the ambient wind changes from the fourth direction d to any direction between the fourth direction d and the sixth direction f, the orientation of each wind rotor mechanism 30 changes linearly, satisfying D / E = F / 60°. This maximizes the overall wind energy received by the seven wind rotor mechanisms 30 and simplifies the control process.

[0084] The above only describes the orientation control of each wind wheel mechanism 30 when the ambient wind changes within a range of 60° in the circumferential direction of the offshore wind turbine. When the wind direction of the ambient wind is within another range of 300°, the control principle is similar to the control principle between the fourth direction d and the sixth direction f, and will not be repeated here.

[0085] As shown in FIG8 , when the wind direction information satisfies that the direction of the ambient wind is parallel to the fourth direction d, the fourth wind wheel mechanism 304 is controlled to move to a position where the angle between the vertical line and the fourth direction d is between 2.5° and 7.5°, the fifth wind wheel mechanism 305 is controlled to move to a position where the angle between the vertical line and the fourth direction d is between 2.5° and 7.5°, the seventh wind wheel mechanism 307 is controlled to move to a position where the angle between the vertical line and the fourth direction d is between 2.5° and 7.5°, the eighth wind wheel mechanism 308 is controlled to move to a position where the angle between the vertical line and the fourth direction d is between 2.5° and 7.5°, and the sixth wind wheel mechanism 306 is controlled to move to a position where the angle between the vertical line and the fourth direction d is between 5° and 15°. and controlling the ninth wind rotor mechanism 309 to move to a position where the angle between the vertical line and the fourth direction d is between 5° and 15°; making the orientations of the fourth wind rotor mechanism 304, the fifth wind rotor mechanism 305, the sixth wind rotor mechanism 306, the seventh wind rotor mechanism 307, the eighth wind rotor mechanism 308 and the ninth wind rotor mechanism 309 meet the above conditions. On the one hand, it makes each wind rotor mechanism 30 face the ambient wind as directly as possible or only form a small angle with the ambient wind. On the other hand, it makes the orientation of the wind rotor mechanism 30 at the rear adapt to the direction of the wind whose flow direction is affected by the wind rotor mechanism 30 in front, so as to maximize the overall wind energy received by the seven wind rotor mechanisms 30 and ensure the efficiency of wind energy utilization. Specifically, the deflection angles of the vertical lines of the fourth wind rotor mechanism 304, the fifth wind rotor mechanism 305, the seventh wind rotor mechanism 307 and the eighth wind rotor mechanism 308 relative to the fourth direction d are between 2.5° and 7.5°, and the deflection angles of the vertical lines of the sixth wind rotor mechanism 306 and the ninth wind rotor mechanism 309 relative to the fourth direction d are between 5° and 15°, so that the wind rotor mechanism located on the rear side can capture wind energy in the best posture. If the angle range is exceeded, the wind energy loss will be greater. The staff can select the deflection angle of the vertical line of each wind rotor mechanism relative to the fourth direction d within the above-mentioned angle range according to the actual situation on site. For example, the deflection angle of the vertical line of the fourth wind rotor mechanism 304, the vertical line of the fifth wind rotor mechanism 305, the vertical line of the seventh wind rotor mechanism 307 and the vertical line of the eighth wind rotor mechanism 308 relative to the fourth direction d is 2.5°, 5° or 7.5°, and the deflection angle of the vertical line of the sixth wind rotor mechanism 306 and the vertical line of the ninth wind rotor mechanism 309 relative to the fourth direction d is 5°, 10° or 15°.

[0086] Similarly, as shown in Figure 9, when the wind direction information satisfies that the wind direction of the ambient wind is parallel to the fifth direction e, the fifth wind rotor mechanism 305 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 2.5° and 7.5°, the sixth wind rotor mechanism 306 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 2.5° and 7.5°, the eighth wind rotor mechanism 308 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 2.5° and 7.5°, the ninth wind rotor mechanism 309 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 2.5° and 7.5°, the seventh wind rotor mechanism 307 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 5° and 15°, and the fourth wind rotor mechanism 304 is controlled to move to a position where the angle between the vertical line and the fifth direction e is between 5° and 15°.

[0087] When controlling the two aforementioned embodiments of offshore wind turbines, the control procedures are identical except for the orientation of each wind rotor mechanism 30. Specifically, step S30 is executed once after each execution of step S10 for a preset duration, wherein the preset duration is between 8 and 12 minutes. In step S10, the wind direction information is the average wind direction information within the preset duration.

[0088] The direction of the ambient wind changes in real time, but its magnitude of change over a short period is relatively small. If the orientation of each wind rotor mechanism 30 were to be adjusted in real time to follow the wind direction, control would be difficult, energy consumption would be high, and wind energy utilization would be ineffective. Therefore, performing a yaw operation (i.e., executing step S30 once) every preset time interval based on the average wind direction information during that time interval can achieve a balanced balance between low control difficulty, low energy consumption, and wind energy utilization. Preferably, the preset time interval can be 8 minutes, 10 minutes, or 12 minutes.

[0089] It should be noted that, since the wind direction of the ambient wind changes in real time, the detected wind direction of the ambient wind also changes continuously. The above-mentioned "average wind direction information" refers to the average wind direction within a preset time period.

[0090] After each step S10 is executed for a preset time period, the control method further includes:

[0091] Step S20: Determine whether the angle difference between the current wind direction information and the previous wind direction information is greater than the preset angle difference. When the angle difference is greater than the preset angle difference, stop the machine for manual maintenance; when the angle difference is less than the preset angle difference, execute step S30.

[0092] Considering that the wind direction generally doesn't change significantly over a short period of time, a large angular difference between wind direction information obtained within two consecutive preset time intervals increases the likelihood of damage to detection components, rendering the detection information inaccurate. Therefore, when the angular difference is greater than the preset angular difference, the wind turbine is shut down for manual maintenance and the relevant components of the offshore wind turbine are promptly inspected to ensure normal operation. When the angular difference is less than the preset angular difference, normal yaw control is performed.

[0093] Among them, the preset angle difference is between 80° and 100°. During specific control, the staff can select an angle value within the above range as the preset angle difference according to the change in the wind direction of the ambient wind in the sea area.

[0094] Specifically, the above-mentioned "current wind direction information" refers to the average wind direction within the preset time period before the current execution of step S30, and the "last wind direction information" refers to the average wind direction within the preset time period before the last execution of step S30.

[0095] Step S10 also includes: obtaining rotor orientation information of the offshore wind turbine generator set;

[0096] Step S30 includes:

[0097] Step S31: Calculating the rotation angle of each wind rotor mechanism 30 according to the wind rotor orientation information and the wind direction information;

[0098] Step S32: The control tower 20 rotates to drive the corresponding wind rotor mechanism 30 to rotate. When the rotation angle of the wind rotor mechanism 30 is greater than the preset angle, the control tower 20 rotates at the first speed and then at the second speed; when the rotation angle of the wind rotor mechanism 30 is less than the preset angle, the control tower 20 rotates at the second speed, wherein the first speed is greater than the second speed.

[0099] Specifically, the wind rotor mechanism 30 is controlled to rotate in sections, and first rotates quickly and then rotates to the final position at a relatively slow speed. This allows the wind rotor mechanism 30 to first change the yaw angle at the fastest corresponding speed to achieve wind facing, and then achieve facing the wind in a precise wind direction at a relatively slow speed, so that the wind rotor mechanism can achieve yaw facing the wind quickly and accurately, thereby reducing the loss of wind energy.

[0100] When the preset angle is in the range of 0.5° to 2°, the first speed is between 0.5° / s and 0.7° / s, and the second speed is between 0.08° / s and 0.12° / s. Generally speaking, a 3° deviation in the wind direction angle enables relatively accurate wind direction alignment. When the wind direction angle deviation is 2°, the wind energy loss is: (π×1×1-π×cos2°×cos2°) / π×1×1=0.1%. Controlling the rotor mechanism 30 to rotate at a higher first speed to a preset angle between 0.5° and 2° enables rapid and relatively accurate wind direction alignment. Then, the wind direction angle of the rotor mechanism 30 is fine-tuned at a relatively lower first speed to further reduce wind energy loss. Specifically, the preset angle can be 0.5°, 1°, 1.5°, or 2°. The magnitude of the first speed is mainly determined by the power and life of the yaw generator. During specific implementation, the staff can select it within the above range based on the specific parameters of the yaw engine. Preferably, the first speed can be 0.5° / s, 0.6° / s, or 0.7° / s. The parameter selection of the second speed ensures the accuracy of wind direction while ensuring a relatively short response time. Taking the second speed of 0.08° / s as an example, 2 / 0.08=25, that is, rotating at the second speed for 25 seconds can achieve relatively accurate wind direction. Preferably, the second speed can be: 0.08° / s, 0.10° / s, or 0.12° / s. When the rotation angle of the wind rotor mechanism 30 is greater than the preset angle, the tower 20 is first controlled to rotate at the first speed until the angle to be rotated of the wind rotor mechanism 30 is equal to or less than the preset angle, and then the tower 20 is controlled to rotate at the second speed.

[0101] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0102] For ease of description, spatially relative terms such as "above," "on the upper surface of," "on top of," etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would then be positioned as "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0103] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0104] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An offshore wind turbine generator set, characterized in that: include: Support base (10); A plurality of towers (20) are arranged on the supporting foundation (10); A plurality of wind wheel mechanisms (30) are arranged in a one-to-one correspondence with the plurality of towers (20), the plurality of wind wheel mechanisms (30) are arranged in multiple rows, the wind wheel mechanisms (30) in each two adjacent rows are staggered, each wind wheel mechanism (30) comprises a front wind wheel (31) and a rear wind wheel (32), the diameter of the front wind wheel (31) being larger than the diameter of the rear wind wheel (32); A plurality of yaw mechanisms (40), one yaw mechanism (40) being provided between each of the towers (20) and the supporting base (10).

2. The offshore wind turbine generator set according to claim 1, characterized in that: The plurality of towers (20) located at the outermost sides define a regular polygonal structure.

3. The offshore wind turbine generator set according to claim 2, characterized in that: In each of the wind wheel mechanisms (30), the axis of the front wind wheel (31) and the axis of the rear wind wheel (32) are arranged at the same height, and the diameter D of the front wind wheel (31) and the diameter d of the rear wind wheel (32) satisfy the following relationship: d = (0.75-0.85) × D; and / or, Each wind wheel mechanism (30) has a circular projection range (300) on a horizontal plane, the projection of the wind wheel mechanism (30) on the horizontal plane completely falls within the circular projection range (300), and the center distance l between the two circular projection ranges (300) of two adjacent wind wheel mechanisms (30) and the radius r of the circular projection range (300) satisfy: l>2.4r.

4. A control method for an offshore wind turbine generator set, characterized in that: The offshore wind turbine generator set is an offshore wind turbine generator set according to any one of claims 1 to 3, and the control method includes: Step S10: Obtaining ambient wind direction information; Step S30: controlling the rotation of the plurality of towers (20) according to the wind direction information to drive the rotation of the plurality of wind wheel mechanisms (30).

5. The control method according to claim 4, characterized in that: The number of the towers (20) and the number of the wind rotor mechanisms (30) are both three, the three wind rotor mechanisms (30) are respectively located at three corners of an equilateral triangle, the three wind rotor mechanisms (30) include a first wind rotor mechanism (301) located at a first corner of the equilateral triangle, a second wind rotor mechanism (302) located at a second corner of the equilateral triangle, and a third wind rotor mechanism (303) located at a third corner of the equilateral triangle, and the step S30 includes: When the wind direction information satisfies that the wind direction of the ambient wind is parallel to a first direction (a), the first wind wheel mechanism (301) is controlled to face the ambient wind, and the second wind wheel mechanism (302) and the third wind wheel mechanism (303) are controlled to tilt toward the center of the equilateral triangle, wherein the first direction (a) is the direction from the first corner of the equilateral triangle to the center of the equilateral triangle; When the wind direction information satisfies that the wind direction of the ambient wind is parallel to a second direction (b), the second wind wheel mechanism (302) is controlled to face the ambient wind, and the first wind wheel mechanism (301) and the third wind wheel mechanism (303) are controlled to tilt toward the center of the equilateral triangle, wherein the second direction (b) is the direction from the second corner of the equilateral triangle to the center of the equilateral triangle; When the wind direction information satisfies that the wind direction of the ambient wind is parallel to a third direction (c) between the first direction (a) and the second direction (b), each of the wind wheel mechanisms (30) is controlled to move to a working position, wherein at the working position, a first angle A is formed between a vertical line of the wind wheel mechanism (30) and a vertical line of the wind wheel mechanism (30) when the wind direction of the ambient wind is parallel to the first direction (a), a second angle B is formed between a vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the first direction (a), and a third angle C is formed between the third direction (c) and the first direction (a), wherein the first angle A, the second angle B, and the third angle C satisfy: A / B=C / 120°.

6. The control method according to claim 5, characterized in that: When the wind direction information satisfies that the direction of the ambient wind is parallel to the first direction (a), the second wind wheel mechanism (302) is controlled to move to a position where the angle between the vertical line and the first direction (a) is between 5° and 15°, and the third wind wheel mechanism (303) is controlled to move to a position where the angle between the vertical line and the first direction (a) is between 5° and 15°; and / or, When the wind direction information satisfies the requirement that the wind direction of the ambient wind is parallel to the second direction (b), the first wind wheel mechanism (301) is controlled to move to a position where the angle between the vertical line and the second direction (b) is between 5° and 15°, and the third wind wheel mechanism (303) is controlled to move to a position where the angle between the vertical line and the second direction (b) is between 5° and 15°.

7. The control method according to claim 4, characterized in that: The number of the towers (20) and the number of the wind rotor mechanisms (30) are both seven, wherein six of the wind rotor mechanisms (30) are respectively located at the six corners of the regular hexagon, the seventh wind rotor mechanism (30) is located at the center of the regular hexagon, and the six wind rotor mechanisms (30) include a fourth wind rotor mechanism (304) located at the first corner of the regular hexagon, a fifth wind rotor mechanism (305) located at the second corner of the regular hexagon, and a sixth wind rotor mechanism (306) located at the third corner of the regular hexagon. ), a seventh wind wheel mechanism (307) located at the fourth corner of the regular hexagon, an eighth wind wheel mechanism (308) located at the fifth corner of the regular hexagon, and a ninth wind wheel mechanism (309) located at the sixth corner of the regular hexagon, the seventh wind wheel mechanism (30) forming a tenth wind wheel mechanism (310), wherein the first corner, the second corner, the third corner, the fourth corner, the fifth corner, and the sixth corner of the regular hexagon are sequentially arranged along the circumferential direction of the regular hexagon, and the step S30 comprises: When the wind direction information satisfies that the wind direction of the ambient wind is parallel to a fourth direction (d), the fourth wind wheel mechanism (304) and the fifth wind wheel mechanism (305) are controlled to tilt toward the center of the line connecting the first corner and the second corner of the regular hexagon, the tenth wind wheel mechanism (310) is controlled to face the ambient wind, and the sixth wind wheel mechanism (306), the seventh wind wheel mechanism (307), the eighth wind wheel mechanism (308) and the ninth wind wheel mechanism (309) are controlled to tilt toward the tenth wind wheel mechanism (310), wherein the fourth direction (d) is the direction from the center of the line connecting the first corner and the second corner of the regular hexagon to the center of the regular hexagon; When the wind direction information satisfies the condition that the wind direction of the ambient wind is parallel to the fifth direction (e), the fifth wind wheel mechanism (305) and the sixth wind wheel mechanism (306) are controlled to tilt toward the center of the line connecting the second corner and the third corner of the regular hexagon, the tenth wind wheel mechanism (310) is controlled to face the ambient wind, and the seventh wind wheel mechanism (307), the eighth wind wheel mechanism (308), the ninth wind wheel mechanism (309) and the fourth wind wheel mechanism (304) are controlled to tilt toward the tenth wind wheel mechanism (310), wherein the fifth direction (e) is the direction from the center of the line connecting the second corner and the third corner of the regular hexagon to the center of the regular hexagon; When the wind direction information satisfies that the wind direction of the ambient wind is parallel to a sixth direction (f) located between the fourth direction (d) and the fifth direction (e), each of the wind wheel mechanisms (30) is controlled to move to a working position, wherein at the working position, a fourth angle D is formed between the vertical line of the wind wheel mechanism (30) and the vertical line of the wind wheel mechanism when the wind direction of the ambient wind is parallel to the fourth direction (d), a fifth angle E is formed between the vertical line of the wind wheel mechanism (30) and the vertical line of the wind wheel mechanism (30) when the wind direction of the ambient wind is parallel to the fourth direction (d), and a sixth angle F is formed between the sixth direction (f) and the fourth direction (d), wherein the fourth angle D, the fifth angle E and the sixth angle F satisfy: D / E=F / 60°.

8. The control method according to claim 7, characterized in that: When the wind direction information satisfies the requirement that the direction of the ambient wind is parallel to the fourth direction (d), the fourth wind wheel mechanism (304) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 2.5° and 7.5°, the fifth wind wheel mechanism (305) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 2.5° and 7.5°, and the seventh wind wheel mechanism (307) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 2.5° and 7.5°. The eighth wind wheel mechanism (308) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 2.5° and 7.5°, the sixth wind wheel mechanism (306) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 5° and 15°, and the ninth wind wheel mechanism (309) is controlled to move to a position where the angle between the vertical line and the fourth direction (d) is between 5° and 15°; and / or, When the wind direction information satisfies the requirement that the wind direction of the ambient wind is parallel to the fifth direction (e), the fifth wind wheel mechanism (305) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 2.5° and 7.5°, the sixth wind wheel mechanism (306) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 2.5° and 7.5°, the eighth wind wheel mechanism (308) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 2.5° and 7.5°, the ninth wind wheel mechanism (309) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 2.5° and 7.5°, the seventh wind wheel mechanism (307) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 5° and 15°, and the fourth wind wheel mechanism (304) is controlled to move to a position where the angle between the vertical line and the fifth direction (e) is between 5° and 15°.

9. The control method according to any one of claims 4 to 8, characterized in that: After executing step S10 for a preset time, step S30 is executed once, wherein: The preset duration is between 8 minutes and 12 minutes; and / or, In step S10, the wind direction information is the average wind direction information within the preset time period.

10. The control method according to claim 9, characterized in that: After executing step S10 for a preset time period, the control method further includes: Step S20: Determine whether the angle difference between the current wind direction information and the previous wind direction information is greater than the preset angle difference. When the angle difference is greater than the preset angle difference, stop the machine for manual maintenance; when the angle difference is less than the preset angle difference, execute step S30.

11. The control method according to any one of claims 4 to 8, characterized in that: The step S10 further includes: obtaining rotor orientation information of the offshore wind turbine generator set; The step S30 includes: Step S31: calculating the rotation angle of each wind wheel mechanism (30) according to the wind wheel orientation information and the wind direction information; Step S32: Control the tower (20) to rotate to drive the corresponding wind wheel mechanism (30) to rotate; when the rotation angle of the wind wheel mechanism (30) is greater than a preset angle, control the tower (20) to rotate at a first speed and then at a second speed; when the rotation angle of the wind wheel mechanism (30) is less than the preset angle, control the tower (20) to rotate at the second speed, wherein the first speed is greater than the second speed.

12. The control method according to claim 11, characterized in that: The preset angle is in the range of 0.5° to 1.5°, the first speed is in the range of 0.5° / s to 0.7° / s, and the second speed is in the range of 0.08° / s to 0.12° / s; and / or, When the rotation angle of the wind wheel mechanism (30) is greater than the preset angle, the tower (20) is first controlled to rotate at the first speed until the angle to be rotated of the wind wheel mechanism (30) is equal to or less than the preset angle, and then the tower (20) is controlled to rotate at the second speed.

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