Hoisting method for multi-blade wind turbine generator set

Abstract

The present application provides a hoisting method of a multi-impeller wind turbine generator set, the hoisting method comprising: hoisting and installing a tower by hoisting equipment; hoisting and installing a first connecting structure by the hoisting equipment, so as to install the first connecting structure on the tower; making the first connecting structure yaw a first predetermined angle in a first direction away from the hoisting equipment through a yaw system; hoisting and installing a second connecting structure by the hoisting equipment, so as to install the second connecting structure on the tower. The hoisting equipment can be located at a first position within a rotation radius of the first connecting structure and the second connecting structure, and the first predetermined angle ranges from 90° to 120°, the rotation radius being a maximum outer diameter formed when the first connecting structure and the second connecting structure rotate around the center axis. According to the hoisting method of the present application, the movement of the hoisting equipment is reduced, the hoisting time is shortened, the hoisting efficiency is improved, and the hoisting cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, and in particular relates to a method for hoisting a multi-bladed wind turbine generator set. Background Technology

[0002] Among the technologies for developing and utilizing renewable energy, wind power technology is more mature and more efficient than other renewable energy technologies, and it is one of the fastest-growing renewable energy technologies in the world today.

[0003] With the development of wind power generation technology, the power of wind turbines is getting larger and larger. In traditional single-rotor wind turbine generator sets, longer and heavier blades need to be designed to achieve greater power, which increases the cost of unit development.

[0004] Therefore, a multi-bladed wind turbine generator set was developed. The multi-bladed wind turbine generator set includes at least two blades, which are mounted to a tower via a support structure. However, the multi-bladed wind turbine generator set increases the overall horizontal length of the wind turbine generator set, making hoisting the entire unit more difficult and increasing the time and cost required for hoisting. Summary of the Invention

[0005] One of the main objectives of this invention is to provide a method for hoisting multi-bladed wind turbine generator sets, which can improve hoisting efficiency and thus reduce the time and cost required for hoisting.

[0006] To achieve the aforementioned objectives, the present invention provides the following technical solution:

[0007] According to one aspect of the present invention, a method for hoisting a multi-bladed wind turbine generator set is provided. The multi-bladed wind turbine generator set includes a tower, a first wind turbine assembly and a second wind turbine assembly, and a first connecting structure and a second connecting structure respectively connecting the first wind turbine assembly and the second wind turbine assembly to the tower. The tower is provided with a yaw system capable of rotating the first connecting structure and the second connecting structure about the central axis of the tower. The hoisting method includes: hoisting and installing the tower and the yaw system with a hoisting device; hoisting and installing the first connecting structure with the hoisting device on a first side in the horizontal direction of the hoisting device to install the first connecting structure onto the tower; yawing the first connecting structure by the yaw system in a first direction away from the hoisting device by a first predetermined angle; and hoisting and installing the second connecting structure with the hoisting device on a second side in the horizontal direction of the hoisting device opposite to the first side to install the second connecting structure onto the tower. The lifting device is located at a first position within the rotation radius R of the first connecting structure and the second connecting structure, and the first predetermined angle ranges from 90° to 120°. The rotation radius R is the maximum outer diameter of the circle formed when the first connecting structure and the second connecting structure rotate around the central axis.

[0008] The lifting equipment can be a crane, which may include a central tower and a boom. The boom is capable of rotating around the central axis of the central tower. The tower may be provided with a first connection point and a second connection point for connecting to a first connecting structure and a second connecting structure, respectively. When the lifting equipment is held in the first position, the first connection point and the second connection point are moved to the lifting range of the boom by a yaw system, thereby lifting the first connecting structure and the second connecting structure, respectively.

[0009] The hoisting method may further include: after installing the second connecting structure, using the hoisting equipment located at the first position to hoist and install the second wind turbine assembly on the second side of the hoisting equipment in the horizontal direction, so as to install the second wind turbine assembly at the end of the second connecting structure, the second wind turbine assembly including a second rotor and a second nacelle; using the yaw system to yaw the first connecting structure in a second direction opposite to the first direction by a first predetermined angle, so as to move the first connecting structure to the first side of the hoisting equipment in the horizontal direction; using the hoisting equipment located at the first position to hoist and install the first wind turbine assembly, so as to install the first wind turbine assembly at the end of the first connecting structure, the first wind turbine assembly including a first rotor and a first nacelle.

[0010] The first position can be in the range of 0.3R to 1.0R.

[0011] The hoisting method may further include: after installing the second connecting structure, moving the hoisting equipment to a second position within the rotation radius R to hoist the first wind turbine assembly and the second wind turbine assembly. The first position and the second position are within the range of 0.3R to 1.0R, and the second position is farther from the tower than the first position.

[0012] The first position can be in the range of 0.3R to 0.5R, and the second position can be in the range of 0.5 to 1.0R.

[0013] The second position may be adjacent to the position of the second wind turbine component to be installed. The hoisting method may further include: after the hoisting equipment moves to the second position, it hoists and installs the second wind turbine component; the first connecting structure is yawed by the yaw system in a second direction opposite to the first direction by a second predetermined angle, the second predetermined angle being greater than or equal to the first predetermined angle; and the hoisting equipment hoists and installs the first wind turbine component at the second position.

[0014] The second predetermined angle can be in the range of 90° to 120°. Assuming that the line connecting the first position and the rotation center of the tower is the first line, and the line connecting the second position and the rotation center of the tower is the second line, the included angle between the first line and the second line is greater than or equal to 0° and less than or equal to 15°.

[0015] The hoisting method may further include: the second position is adjacent to the position of the first wind turbine component to be installed; after the hoisting equipment moves to the second position, it hoists and installs the first wind turbine component; the first connecting structure is yawed along the first direction by a second predetermined angle through the yaw system, so that the first connecting structure is moved away from the hoisting equipment on the first side of the horizontal direction of the hoisting equipment, and the second connecting structure is moved closer to the hoisting equipment on the second side of the horizontal direction of the hoisting equipment, wherein the second predetermined angle is greater than or equal to the first predetermined angle; the hoisting equipment hoists and installs the second wind turbine component at the second position.

[0016] The second predetermined angle can be in the range of 90° to 120°. Assuming that the line connecting the first position and the rotation center of the tower is the first line, and the line connecting the second position and the rotation center of the tower is the second line, the included angle between the first line and the second line can be greater than or equal to 90° and less than or equal to 120°.

[0017] The lifting equipment can be mounted on an installation vessel, which includes multiple retractable outriggers located below its hull. The straight-line distance between the first position and the second position is greater than the maximum diameter of the circle formed by the multiple retractable outriggers.

[0018] According to another aspect of the present invention, a method for hoisting a multi-bladed wind turbine generator set is provided. The multi-bladed wind turbine generator set includes a tower, a first wind turbine assembly and a second wind turbine assembly, and a first connecting structure and a second connecting structure respectively connecting the first wind turbine assembly and the second wind turbine assembly to the tower. The tower is provided with a yaw system capable of rotating the first connecting structure and the second connecting structure about the central axis of the tower. The first connecting structure includes a first tower connecting section and a first wind turbine connecting section connected to the tower and respectively for connecting to the first wind turbine assembly. The second connecting structure includes a second tower connecting section and a second wind turbine connecting section connected to the tower and respectively for connecting to the second wind turbine assembly. The hoisting method may include: positioning the hoisting equipment at a first position within the rotation radius R of the first connecting structure; hoisting and installing the tower using the hoisting equipment; hoisting and installing the first tower connecting section using the hoisting equipment on a first side in the horizontal direction of the hoisting equipment; yawing the first tower connecting section away from the hoisting equipment by a first predetermined angle using the yaw system; hoisting and installing the second tower connecting section using the hoisting equipment on a second side in the horizontal direction of the hoisting equipment opposite to the first side; and moving the hoisting equipment to a second position within the rotation radius R to install the first wind turbine connecting section and the second wind turbine connecting section. Wherein, the second position is farther from the tower than the first position, and the first predetermined angle ranges from 90° to 120°, and the rotation radius is the maximum outer diameter of the first connecting structure and the second connecting structure rotating around the central axis.

[0019] The hoisting method may further include: the second position is adjacent to the position of the second wind turbine connecting section to be installed; after the hoisting equipment moves to the second position, the second wind turbine connecting section is hoisted and installed by the hoisting equipment on the second side of the hoisting equipment in the horizontal direction, so as to install the second wind turbine connecting section to the second tower connecting section; the first tower connecting section is yawed by the yaw system in a second direction opposite to the first direction by a second predetermined angle; the first wind turbine connecting section is hoisted and installed by the hoisting equipment on the first side of the hoisting equipment in the horizontal direction, so as to install the first wind turbine connecting section to the first tower connecting section. Wherein, the range of the second predetermined angle is 90° to 120°, the second predetermined angle is greater than or equal to the first predetermined angle, the first position is within the circular area covered by the rotation of the first tower connecting section and the second tower connecting section, and the second position is within the annular area covered by the rotation of the first wind turbine connecting section and the second wind turbine connecting section.

[0020] The second predetermined angle can be in the range of 90° to 120°. Assuming that the line connecting the first position and the rotation center of the tower is the first line, and the line connecting the second position and the rotation center of the tower is the second line, the included angle between the first line and the second line can be greater than or equal to 0° and less than or equal to 15°.

[0021] The hoisting method may further include: the second position is adjacent to the position of the first wind turbine connecting section to be installed; after the hoisting equipment moves to the second position, the first wind turbine connecting section is hoisted and installed by the hoisting equipment on the first side of the hoisting equipment in the horizontal direction, so as to install the first wind turbine connecting section to the first tower connecting section; the first tower connecting section is yawed along the first direction by a third predetermined angle by the yaw system; the second wind turbine connecting section is hoisted and installed by the hoisting equipment on the second side of the hoisting equipment in the horizontal direction, so as to install the second wind turbine connecting section to the second tower connecting section. The third predetermined angle may be in the range of 90° to 120°, and the first predetermined angle is less than or equal to the third predetermined angle.

[0022] The first position can be in the range of 0.3R to 0.5R, and the second position can be in the range of 0.5R to 1.0R.

[0023] The second predetermined angle can be in the range of 90° to 120°. Assuming that the line connecting the first position and the rotation center of the tower is the first line, and the line connecting the second position and the rotation center of the tower is the second line, the included angle between the first line and the second line can be greater than or equal to 90° and less than or equal to 120°.

[0024] According to an embodiment of the present invention, the entire multi-bladed wind turbine generator set is hoisted by using a yaw system rotary connection structure, which reduces the movement of the hoisting equipment, thereby shortening the hoisting time, improving hoisting efficiency and reducing hoisting costs. Attached Figure Description

[0025] The above and / or other objects and advantages of the present invention will become more apparent from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 and Figure 2 A schematic structural diagram of a multi-bladed wind turbine generator set according to an exemplary embodiment of the present invention is shown.

[0027] Figures 3A to 3E A schematic plan view of a method for hoisting a multi-bladed wind turbine generator set according to a first exemplary embodiment of the present invention is shown.

[0028] Figures 4A to 4C A schematic plan view of another hoisting method for a multi-bladed wind turbine generator set according to a first exemplary embodiment of the present invention is shown.

[0029] Figures 5A to 5C A schematic plan view of another hoisting method for a multi-bladed wind turbine generator set according to a first exemplary embodiment of the present invention is shown.

[0030] Figures 6A to 6C A schematic plan view of a method for hoisting a multi-bladed wind turbine generator set according to a second exemplary embodiment of the present invention is shown.

[0031] Figures 7A to 7E A schematic plan view of another hoisting method for a multi-bladed wind turbine generator set according to a second exemplary embodiment of the present invention is shown.

[0032] Figures 8A to 8E A schematic plan view of another hoisting method for a multi-bladed wind turbine generator set according to a second exemplary embodiment of the present invention is shown.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100 - Tower, 110 - Another tower, 200 - Yaw system, 600 - Lifting equipment, 210 - First wind turbine assembly, 220 - Second wind turbine assembly, 230 - Third wind turbine assembly, 240 - Fourth wind turbine assembly, 310 - First connecting structure, 320 - Second connecting structure, 330 - Third connecting structure, 340 - Fourth connecting structure, 410 - First wind rotor, 420 - Second wind rotor, 430 - Third wind rotor, 440 - Fourth wind rotor, 510 - First nacelle, 520 - Second nacelle, 530 - Third nacelle, 540 - Fourth nacelle. Detailed Implementation

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be construed that the embodiments of the invention are limited to those described herein. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0036] Figure 1 and Figure 2 A schematic structural diagram of a multi-bladed wind turbine generator set according to an exemplary embodiment of the present invention is shown.

[0037] like Figure 1 As shown, the multi-bladed wind turbine generator set 10 according to an embodiment of the present invention may include a tower 100, a first wind turbine assembly 210 and a second wind turbine assembly 220, and a first connecting structure 310 and a second connecting structure 320 respectively connecting the first wind turbine assembly 210 and the second wind turbine assembly 220 to the tower 100. The tower 100 is provided with a yaw system 200 capable of rotating the first connecting structure 310 and the second connecting structure 320 about the central axis (not shown) of the tower 100. Furthermore, the first connecting structure 310 may be a rigid support beam, connecting the tower 100 and the first wind turbine assembly 210 at both ends. The second connecting structure 320 may have the same structure and material as the first connecting structure 310, connecting the tower 100 and the second wind turbine assembly 220 at both ends. As an optional solution, the first connecting structure 310 and the second connecting structure 320 are located on both sides of the tower 100 and arranged symmetrically about the tower 100, so that the force distribution on both sides of the tower 100 is consistent, improving the stability of the support structure of the tower 100 and preventing the tower 100 from tilting to one side or even overturning due to asymmetrical force. According to an exemplary embodiment of the present invention, the first connecting structure 310 and the second connecting structure 320 are at an angle of approximately 180° relative to the tower 110, that is, when viewed from above, the first connecting structure 310 and the second connecting structure 320 are approximately in a straight line. However, the present invention is not limited to this. The first connecting structure 310 and the second connecting structure 320 are not limited to rigid support beams, but can also be other connecting structures that can respectively install the first wind turbine assembly 210 and the second wind turbine assembly 220 to the tower 100. For example, all or part of the first connecting structure 310 and the second connecting structure 320 can also be made of flexible materials. In addition, the first connecting structure 310 and the second connecting structure 320 can also have other angles, as long as the wind turbines of the first wind turbine assembly 210 and the second wind turbine assembly 220 face the same direction, and the forces on both sides of the tower 100 are consistent, and the structure is stable.

[0038] also, Figure 1The diagram also shows that the multi-bladed wind turbine generator 10 further includes another tower 110 disposed above the tower 100, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, and a third connection structure 330 and a fourth connection structure 340 respectively connecting the third wind turbine assembly 230 and the fourth wind turbine assembly 240 to the other tower 110. The third connection structure 330 and the fourth connection structure 340 may be disposed directly above the first connection structure 310 and the second connection structure 320, respectively. Specifically, the third connection structure 330 and the fourth connection structure 340 may be disposed approximately in a straight line, and the straight line containing the third connection structure 330 and the fourth connection structure 340 is parallel to the straight line containing the first connection structure 310 and the second connection structure 320.

[0039] According to embodiments of the present invention, the first wind turbine assembly 210 may include a first nacelle 510 and a first rotor 410; the second wind turbine assembly 220 may include a second nacelle 520 and a second rotor 420; the third wind turbine assembly 230 may include a third nacelle 530 and a third rotor 430; and the fourth wind turbine assembly 240 may include a fourth nacelle 540 and a fourth rotor 440. Each nacelle includes structures such as a hub, generator, and transmission system. The term "nacelle" in this invention also includes these internal structures, which are collectively referred to as "nacelle" for ease of description. Furthermore, the description of nacelle hoisting below includes the hoisting of its internal structures, which can be completed through multiple hoisting operations. Additionally, in the case of a direct-drive wind turbine generator set, the term "nacelle" in this invention may also refer to the combination of the nacelle and generator of the direct-drive wind turbine generator set (because the engine of the direct-drive unit is outside the nacelle).

[0040] However, according to an exemplary embodiment of the present invention, it may include only two wind turbine components (first wind turbine component 210 and second wind turbine component 220) and their corresponding structures, excluding the other tower 110, the third wind turbine component 230 and the fourth wind turbine component 240, as well as the third connecting structure 330 and the fourth connecting structure 340. Furthermore, the structure of the multi-bladed wind turbine generator set 10 according to an embodiment of the present invention is not limited to two or four wind turbine components; it may also include other numbers of wind turbine components and their corresponding structures, and the hoisting method according to the present invention is equally applicable to multi-bladed wind turbine generator sets including other numbers of wind turbine components.

[0041] Figures 3A to 3C A schematic plan view of a method for hoisting a multi-bladed wind turbine generator set according to a first exemplary embodiment of the present invention is shown.

[0042] The following reference Figures 3A to 3C A method for hoisting a multi-bladed wind turbine generator set 10 according to a first exemplary embodiment of the present invention is described.

[0043] like Figure 3A As shown, firstly, the tower 100 is lifted and installed using the lifting equipment 600, and then installed at a predetermined position. Next, while the lifting equipment 600 remains in the first position, the first connecting structure 310 is lifted and installed using the lifting equipment 600 to attach the first connecting structure to the tower 100. Before or during the lifting of the first connecting structure 310, if the connection position on the tower 100 corresponding to the first connecting structure 310 is not suitable for docking with the first connecting structure 310, the yaw system 200 can be used to adjust the connection position on the tower 100 corresponding to the first connecting structure 310 to a suitable position. Then, as... Figure 3B As shown, the yaw system 200 yaws the first connecting structure 310 by a first predetermined angle α in a first direction away from the lifting equipment 600 (e.g., counterclockwise), thereby adjusting the connection position on the tower 100 corresponding to the second connecting structure 320 to a suitable position close to the lifting equipment 600, suitable for the lifting equipment 600 to rotate the second connecting structure 320; then, the lifting equipment 600 lifts and installs the second connecting structure 320 to install the second connecting structure 320 onto the tower 100 (e.g., ...). Figure 3C (As shown).

[0044] The aforementioned first predetermined angle α can range from 90° to 120°. Therefore, the lifting device 600 can be located at a first position within the rotation radius R of the first connecting structure 310 and the second connecting structure 320. Here, the rotation radius R refers to the maximum outer diameter of the circle formed when the first connecting structure 310 and the second connecting structure 320 rotate around the central axis (not labeled). According to an embodiment of the invention, the rotation radius R is equal to the distance from the central axis of the tower 100 to the ends of the first connecting structure 310 and the second connecting structure 320 used for mounting the first fan assembly 210 and the second fan assembly 220.

[0045] The lifting device 600 may be a crane, which may include a central tower (not shown) and a boom (not shown) surrounding the central tower. During the lifting process described above, "the lifting device 600 is in a first position" means that the central tower of the crane is in a first position and the boom is able to rotate at a corresponding angle around the central axis (not shown) of the central tower according to the structure to be installed.

[0046] According to an embodiment of the present invention, the first position can be located within the range of 0.3R to 1.0R, that is, the distance between the first position and the rotation center of the yaw system of the tower 100 is 0.3R to 1.0R. When the first position is within the range of 0.3R to 1.0R, the position of the lifting equipment 600 can remain unchanged, that is, the lifting equipment 600 can perform the lifting of the tower 100, the first connecting structure 310 and the second connecting structure 320 respectively at the first position.

[0047] In such Figure 3B and 3C During the hoisting of the first connecting structure 310 and the second connecting structure 320, the hoisting equipment 600 remains stationary, while the tower 100 is rotated via the yaw system 200. This adjusts the first and second connection points on the tower 100, which are respectively used to connect with the first connecting structure 310 and the second connecting structure 320, to suitable positions, i.e., positions where the boom of the hoisting equipment 600 can perform hoisting of the first connecting structure 310 and the second connecting structure 320. For example, the first connection point is adjusted to a first side (e.g., the right side) in the horizontal direction of the hoisting equipment 600 for hoisting the first connecting structure 310. Then, using the yaw system 200, the second connection point is adjusted to a second side (e.g., the left side) in the horizontal direction of the hoisting equipment 600 for hoisting the second connecting structure 320. During this process, the central tower column of the hoisting equipment 600 remains stationary, and the structures to be connected are positioned within the range of motion of the hoisting equipment 600's boom solely through the rotation of the boom and the coordination of the yaw system 200.

[0048] The following reference Figure 3D and Figure 3E The following steps describe the hoisting method according to a first exemplary embodiment of the present invention.

[0049] like Figure 3D As shown, after the second connecting structure 320 is installed onto the tower 100, the second wind turbine assembly 220 can be directly lifted and installed using the lifting equipment 600 without moving the lifting equipment 600 or using the yaw system 200, and then installed onto the end of the second connecting structure 320. Then, the yaw system 200 is used to yaw the first connecting structure 310 along a second direction opposite to the first direction (e.g., clockwise) by the aforementioned first predetermined angle, causing the first connecting structure 310 to return to its initial position. Afterwards, the lifting equipment 600 is used to lift and install the first wind turbine assembly 210, and then install the first wind turbine assembly 210 onto the end of the first connecting structure 310.

[0050] The step of lifting and installing the second wind turbine assembly 220 includes: lifting and installing the second nacelle 520, and installing the second nacelle 520 to the end of the second connecting structure 320 opposite to the end connected to the tower 100; and lifting and installing the second rotor 420 to install the second rotor 420 to the second nacelle 520. Similarly, the step of lifting and installing the first wind turbine assembly 210 includes: lifting and installing the first nacelle 510, and installing the first nacelle 510 to the end of the first connecting structure 310 opposite to the end connected to the tower 100; and lifting and installing the first rotor 410 to install the first rotor 410 to the first nacelle 510.

[0051] According to an exemplary embodiment of the present invention, when hoisting the second wind turbine assembly 220 and the first wind turbine assembly 210, the position of the hoisting equipment (i.e., the position of the central tower column) can always be kept in the first position, thereby reducing the time required to move the hoisting equipment, improving hoisting efficiency and reducing hoisting costs.

[0052] According to the hoisting method of the present invention, when the hoisting equipment 600 is held in a first position within the rotation radius R of the first connecting structure 310 and the second connecting structure 320, the tower 100 and the yaw system 200 are located within the hoisting range of the hoisting equipment 600. Furthermore, the yaw system 200 can adjust the installation points of the first connecting structure 310, the second connecting structure 320, the first wind turbine assembly 210, and the second wind turbine assembly 220 to the hoisting range of the hoisting equipment 600 without moving the hoisting equipment 600. More specifically, by cooperating with the boom of the yaw system 200 and the lifting equipment 600, the installation of the first connecting structure 310 and the second connecting structure 320, which are 180 degrees apart in the circumferential direction, as well as the installation of the first wind turbine assembly 210 and the second wind turbine assembly 220, can be achieved. Thus, only one construction positioning of the lifting equipment 600 is required to complete the installation of all components of the entire wind turbine generator set, reducing the cost increase caused by the relocation of the lifting equipment 600, especially when the lifting equipment 600 is large in size.

[0053] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0054] Figures 4A to 4C A schematic plan view of another hoisting method according to an embodiment of the present invention is shown.

[0055] The steps of hoisting the first connecting structure 310 and the second connecting structure 320 according to the hoisting method of this embodiment are as follows: Figures 3A to 3C The steps are the same as those in the previous section, so the relevant descriptions are omitted.

[0056] like Figures 4A to 4C As shown, after hoisting the first connecting structure 310 and the second connecting structure 320, the lifting equipment 600 can move to a second position to hoist the second fan assembly 220 and the first fan assembly 210. This is usually because the lifting equipment 600 is relatively small, making it difficult to hoist the first fan assembly 210 and the second fan assembly 220 at the same location after completing the hoisting of the first connecting structure 310 and the second connecting structure 320.

[0057] Therefore, the second position can be farther away from the tower than the first position. Specifically, the distance of the second position from the rotation center of the tower 100 can be greater than the distance of the first position from the rotation center of the tower 100, so that the lifting equipment 600 can be closer to the second wind turbine assembly 220 to be installed, thereby lifting and installing the second wind turbine assembly 220 at the second position. Furthermore, the first and second positions can be within the range of 0.3R to 1.0R, preferably the first position is within the range of 0.3R to 0.5R and the second position is within the range of 0.5R to 1.0R, but the invention is not limited thereto. As an example, the second position can be located on the same radius as the first position.

[0058] The specific hoisting steps are as follows: Figure 4A and Figure 4B As shown, the lifting equipment 600 is moved to a second position to lift and install the second fan assembly 220 at that second position; then the first connecting structure 310 is rotated a second predetermined angle in a second direction (e.g., clockwise), as... Figure 4CAs shown, the first fan assembly 210 is lifted and installed using a lifting device 600, wherein the lifting device 600 is located in the second position and does not move.

[0059] Furthermore, when the lifting equipment 600 is in the second position, the yaw system 200 can rotate the first connecting structure 310 and the second connecting structure 320 by a second predetermined angle that is greater than the first predetermined angle when the second connecting structure 320 is installed. However, the present invention is not limited to this; the yaw system 200 can also rotate the first connecting structure 310 and the second connecting structure 320 by the same angle α as the first angle. That is, the second predetermined angle can be greater than or equal to the first predetermined angle. In addition, both the first and second predetermined angles can be within the range of 90° to 120°, as long as the point to be lifted is within the lifting range of the lifting equipment 600.

[0060] According to an embodiment of the present invention, assuming that the line connecting the first position and the rotation center of the tower 100 is the first line, and the line connecting the second position and the rotation center of the tower 100 is the second line, the included angle between the first line and the second line is greater than or equal to 0° and less than or equal to 15°, so that the second position is close to the position of the second wind turbine assembly 220 to be installed.

[0061] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0062] Figures 5A to 5C A hoisting method according to another embodiment of the present invention is shown.

[0063] The steps of hoisting the first connecting structure 310 and the second connecting structure 320 according to the hoisting method of this embodiment are as follows: Figures 3A to 3C The steps are the same as those in the previous section, so the relevant descriptions are omitted.

[0064] like Figures 5A to 5C As shown, after the first connecting structure 310 and the second connecting structure 320 are hoisted, the hoisting equipment 600 can be moved to the second position to hoist the first fan assembly 210 and the second fan assembly 220.

[0065] like Figures 5A to 5CAs shown, after hoisting the first connecting structure 310 and the second connecting structure 320, the hoisting equipment 600 can move to a second position, which is close to the first wind turbine assembly 210 to be installed, so as to hoist and install the first wind turbine assembly 210 at the second position (e.g., Figure 5B (As shown), then the yaw system 200 is used to rotate the first connecting structure 310 and the second connecting structure 320 in a first direction (e.g., counterclockwise) by a third predetermined angle, such that the first connecting structure 310 moves away from the lifting equipment and the second connecting structure 320 approaches the lifting equipment 600 from the side opposite to the first connecting structure 310, and the second wind turbine assembly 220 is lifted and installed by the lifting equipment (e.g. Figure 5C (As shown).

[0066] The lifting method according to this embodiment can be used for offshore lifting. When lifting a multi-bladed wind turbine generator set 10 at sea, the lifting equipment 600 is usually mounted on an installation vessel (not shown), so the lifting equipment 600 used for offshore lifting is usually relatively small. Therefore, after lifting the first connecting structure 310 and the second connecting structure 320, it is usually necessary to move the position of the lifting equipment 600 to lift the first wind turbine assembly 210 and the second wind turbine assembly 220.

[0067] The installation vessel typically includes multiple retractable outriggers located beneath the hull. When the lifting equipment 600 is used to install the first connecting structure 310 and the second connecting structure 320, the retractable outriggers extend downwards into the seabed to lift the installation vessel out of the water, thereby securing the lifting equipment 600 in a first position. When it is necessary to move the installation vessel, the retractable outriggers are retracted, lowering the hull of the installation vessel into the water, thereby enabling the lifting equipment 600 to be moved to a second position.

[0068] In this scenario, because the retractable outriggers create holes in the seabed at the first position, when the installation vessel moves to the second position, the corresponding seabed location (i.e., the position where the retractable outriggers will extend) needs to be spaced apart from the holes at the first position. Otherwise, the installation vessel will lose stability. Therefore, the straight-line distance between the first and second positions can be greater than the maximum diameter of the circle formed by the multiple retractable outriggers. By ensuring that the straight-line distance between the first and second positions is greater than the maximum diameter of the circle formed by the multiple retractable outriggers, the problem of the installation vessel losing stability can be effectively avoided.

[0069] Furthermore, the second position can be farther away from the tower 100 than the first position. Specifically, the distance between the second position and the rotation center of the tower 100 can be greater than the distance between the first position and the rotation center of the tower 100, thereby bringing the lifting equipment 600 closer to the first wind turbine assembly 210 to be installed, so as to lift and install the first wind turbine assembly 210 at the second position. Additionally, the first and second positions can be within the range of 0.3R to 1.0R, preferably the first position can be within the range of 0.3R to 0.5R and the second position can be within the range of 0.5R to 1.0R, but the invention is not limited thereto.

[0070] In addition, the third predetermined angle can be greater than or equal to the first predetermined angle. Furthermore, both the first and third predetermined angles can be within the range of 90° to 120°. When assuming that the line connecting the first position and the rotation center of the tower 100 is the first line and the line connecting the second position and the rotation center of the tower (100) is the second line, the included angle between the first line and the second line can be greater than or equal to 90° and less than or equal to 120°.

[0071] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0072] Figures 6A to 6C A method for hoisting a multi-bladed wind turbine generator set according to another embodiment of the present invention is shown.

[0073] Unlike the aforementioned exemplary embodiments, the first connection structure 310 of the multi-bladed wind turbine generator set according to this embodiment may include a first tower connection section 311 connected to the tower 100 and a first rotor connection section 312 connected to the first wind turbine assembly 210. The second connection structure 320 may include a second tower connection section 321 connected to the tower 100 and a second rotor connection section 322 connected to the second wind turbine assembly 220. Therefore, unlike the hoisting method of the aforementioned embodiments, each connection structure requires two hoisting operations.

[0074] like Figures 6A to 6CAs shown, firstly, the lifting equipment 600 is positioned at a first position within the rotation radius R of the first connecting structure, and the tower 100 is lifted and installed using the lifting equipment 600; then, the first tower connecting section 311 is lifted and installed using the lifting equipment 600, and the first wind turbine connecting section 312 is lifted and installed using the lifting equipment 600; then, the first connecting structure 310 is yawed by a first predetermined angle in a first direction away from the lifting equipment 600 (e.g., counterclockwise) using the yaw system 200; then, the second tower connecting section 321 and the second wind turbine connecting section 322 are lifted and installed sequentially using the lifting equipment 600.

[0075] According to Figures 3A to 3C The same embodiment is shown, the first predetermined angle α can be in the range of 90° to 120°, and the lifting device 600 can always be located at a first position within the rotation radius R of the first connecting structure 310 and the second connecting structure 320.

[0076] The following steps are the same as those described in the exemplary embodiments above, and therefore their detailed description is omitted.

[0077] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0078] Figures 7A to 7E Another method for hoisting a multi-bladed wind turbine generator set according to another embodiment of the present invention is shown.

[0079] The structure of the multi-bladed wind turbine generator set according to this exemplary embodiment and according to Figures 6A to 6C The multi-blade wind turbine generator sets have the same structure, so a detailed description of the structure is omitted.

[0080] In an embodiment of the present invention, the lifting equipment 600 performs lifting at a first position and a second position, respectively. This lifting method is applicable to situations where the lifting equipment 600 is relatively small.

[0081] Specifically, firstly, as Figure 7AAs shown, the lifting equipment 600 is positioned at a first position within the rotation radius R of the first connecting structure 310, and the tower 100 is lifted and installed using the lifting equipment 600; then as... Figure 7B As shown, the first tower connection section 311 is lifted and installed using lifting equipment 600; the first tower connection section 311 is yawed by a first predetermined angle in a first direction away from the lifting equipment 600 (e.g., counterclockwise) using yaw system 200; then as follows... Figure 7C As shown, the second tower connecting section 321 is lifted and installed using the lifting equipment 600; then the lifting equipment 600 is moved to a second position within the rotation radius R to install the first wind turbine connecting section 312 and the second wind turbine connecting section 322.

[0082] Specifically, such as Figure 7D As shown, the second position is farther from the tower 100 than the first position and closer to the position of the second wind turbine connecting section 322 to be installed. Therefore, after the lifting equipment 600 moves to the second position, the second wind turbine connecting section 322 is lifted and installed to install the second wind turbine connecting section 322 onto the second tower connecting section 321; then the first tower connecting section 311 is yawed by a second predetermined angle in a second direction opposite to the first direction (e.g., clockwise direction), such as... Figure 7E As shown, the first wind turbine connecting section 312 is lifted and installed using lifting equipment 600 to install the first wind turbine connecting section 312 onto the first tower connecting section 311.

[0083] Similar to the aforementioned embodiments, both the first position and the second position can be located within the rotation radius R of the first connecting structure 310 and the second connecting structure 320, that is, the first position and the second position can be within the range of 0.3R to 1.0R. Preferably, the first position can be within the range of 0.3R to 0.5R, and the second position can be within the range of 0.5R to 1.0R. Furthermore, the range of the first predetermined angle and the second predetermined angle can be 90° to 120°, and the second predetermined angle can be greater than or equal to the first predetermined angle.

[0084] Furthermore, since the method for installing the first and second wind turbine components is the same as in the aforementioned embodiments, a detailed description of the hoisting method is omitted.

[0085] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0086] Figures 8A to 8E Another method for hoisting a multi-bladed wind turbine generator set according to another embodiment of the present invention is shown.

[0087] The structure of the multi-bladed wind turbine generator set according to this exemplary embodiment and according to Figures 6A to 6C The multi-blade wind turbine generator sets have the same structure, so a detailed description of the structure is omitted.

[0088] In an embodiment of the invention, the lifting equipment 600 performs lifting operations at a first position and a second position, respectively. This lifting method is applicable to offshore lifting operations.

[0089] Specifically, firstly, as Figure 8A As shown, the lifting equipment 600 is positioned at a first position within the rotation radius R of the first connecting structure 310, and the tower 100 is lifted and installed using the lifting equipment 600; then as... Figure 8B As shown, the first tower connection section 311 is lifted and installed using lifting equipment 600; the first tower connection section 311 is yawed by a first predetermined angle in a first direction away from the lifting equipment 600 (e.g., counterclockwise) using yaw system 200; then as follows... Figure 8C As shown, the second tower connecting section 321 is lifted and installed using lifting equipment 600; then the lifting equipment 600 is moved to a second position within the rotation radius R, as shown. Figure 8D As shown, the second position is farther from the tower 100 than the first position and closer to the position of the first wind turbine connecting section 312 to be installed. Therefore, after the lifting equipment 600 moves to the second position, the first wind turbine connecting section 312 is lifted and installed to install the first wind turbine connecting section 312 onto the first tower connecting section 311; then the second tower connecting section 321 is yawed along a first direction (e.g., counterclockwise) by a third predetermined angle, such as... Figure 8E As shown, the second wind turbine connecting section 322 is lifted and installed using lifting equipment 600 to install the second wind turbine connecting section 322 onto the second tower connecting section 321.

[0090] According to Figures 5A to 5C The described embodiments are identical. Both the first and second positions can be located within the rotation radius R of the first connecting structure 310 and the second connecting structure 320 (i.e., the first and second positions can be within the range of 0.3R to 1.0R), and the straight-line distance between the first and second positions is greater than the maximum diameter of the circle formed by the plurality of retractable outriggers, thus effectively avoiding the problem of the installation vessel losing stability. Furthermore, preferably, the first position can be within the range of 0.3R to 0.5R, and the second position can be within the range of 0.5R to 1.0R.

[0091] Furthermore, the range of the first predetermined angle and the third predetermined angle can be from 90° to 120°, and the third predetermined angle can be greater than or equal to the first predetermined angle.

[0092] Furthermore, since the method for installing the first and second wind turbine components is the same as in the aforementioned embodiments, a detailed description of the hoisting method is omitted.

[0093] According to an embodiment of the present invention, when the multi-bladed wind turbine generator set 10 further includes another tower 110, a third wind turbine assembly 230 and a fourth wind turbine assembly 240, as well as a third connecting structure 330 and a fourth connecting structure 340, the tower 100 and 110 can be installed first, and then the third connecting structure 330 and the fourth connecting structure 340, the third wind turbine assembly 230 and the fourth wind turbine assembly 240 located above can be installed in a manner similar to that of this embodiment. After that, the first connecting structure 310 and the second connecting structure 320 located below, as well as the first wind turbine assembly 210 and the second wind turbine assembly 220 located below can be installed according to the above steps of this exemplary embodiment, thereby realizing the installation of the entire wind turbine generator set. The detailed hoisting process is omitted here.

[0094] According to an embodiment of the present invention, the entire wind turbine generator set is hoisted by using a yaw system rotating connection structure, which reduces the movement of the hoisting equipment, thereby shortening the hoisting time, improving hoisting efficiency and reducing hoisting costs.

[0095] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0096] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0097] The features, structures, or characteristics described in this invention can be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided to give a full understanding of embodiments of the invention. However, those skilled in the art will recognize that the technical solutions of the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the invention.

Claims

1. A method for hoisting a multi-bladed wind turbine generator set, the multi-bladed wind turbine generator set comprising a tower (100), a first wind turbine assembly (210), a second wind turbine assembly (220), and a first connecting structure (310) and a second connecting structure (320) respectively connecting the first wind turbine assembly (210) and the second wind turbine assembly (220) to the tower (100), wherein the tower (100) is provided with a yaw system (200) capable of rotating the first connecting structure (310) and the second connecting structure (320) around the central axis of the tower (100), characterized in that, The hoisting method includes: The tower (100) and the yaw system (200) are lifted and installed using the lifting equipment (600). The first connecting structure (310) is lifted and installed on the first side of the lifting equipment (600) in the horizontal direction to install the first connecting structure (310) onto the tower (100); The first connecting structure (310) is yawed by a first predetermined angle in a first direction away from the lifting equipment (600) by the yaw system (200); The second connecting structure (320) is lifted and installed on the second side of the lifting equipment (600) in the horizontal direction opposite to the first side, so as to install the second connecting structure (320) onto the tower (100). The lifting device (600) is located at a first position within the rotation radius R of the first connecting structure (310) and the second connecting structure (320), and the first predetermined angle ranges from 90° to 120°. The rotation radius R is the maximum outer diameter of the circle formed when the first connecting structure (310) and the second connecting structure (320) rotate around the central axis.

2. The hoisting method according to claim 1, characterized in that, The lifting equipment (600) is a crane, which includes a central tower and a boom. The boom is capable of rotating around the central axis of the central tower. The tower (100) is provided with a first connection point and a second connection point for connecting to the first connection structure (310) and the second connection structure (320) respectively. When the lifting equipment (600) is held in the first position, the first connection point and the second connection point are moved to the lifting range of the boom by the yaw system (200) to lift the first connection structure (310) and the second connection structure (320) respectively.

3. The hoisting method according to claim 1, characterized in that, The hoisting method also includes: After the second connecting structure (320) is installed, the second wind turbine assembly (220) is lifted and installed on the second side of the horizontal direction of the lifting equipment (600) at the first position using the lifting equipment (600) to install the second wind turbine assembly (220) at the end of the second connecting structure (320), the second wind turbine assembly (220) including a second wind turbine (420) and a second nacelle (520). The first connecting structure (310) is yawed by the yaw system (200) in a second direction opposite to the first direction by the first predetermined angle, so that the first connecting structure moves to the first side of the lifting equipment (600) in the horizontal direction; The first wind turbine assembly (210) is lifted and installed using the lifting equipment (600) located at the first position to install the first wind turbine assembly (210) at the end of the first connecting structure (310), the first wind turbine assembly (210) including a first wind turbine (410) and a first nacelle (510).

4. The hoisting method according to claim 3, characterized in that, The first position is in the range of 0.3R to 1.0R.

5. The hoisting method according to claim 1, characterized in that, The hoisting method also includes: After the second connecting structure (320) is installed, the lifting equipment (600) is moved to a second position within the rotation radius R to lift the first fan assembly (210) and the second fan assembly (220). Wherein, the first position and the second position are in the range of 0.3R to 1.0R and the second position is farther away from the tower (100) than the first position.

6. The hoisting method according to claim 5, characterized in that, The first position is in the range of 0.3R to 0.5R, and the second position is in the range of 0.5 to 1.0R.

7. The hoisting method according to claim 5, characterized in that, The second position is adjacent to the position of the second wind turbine assembly (220) to be installed, and the hoisting method further includes: After the lifting equipment (600) is moved to the second position, it lifts and installs the second fan assembly (220). The first connecting structure (310) is yawed by the yaw system (200) in a second direction opposite to the first direction by a second predetermined angle, the second predetermined angle being greater than or equal to the first predetermined angle; The lifting equipment (600) lifts and installs the first fan assembly (210) at the second position.

8. The hoisting method according to claim 7, characterized in that, The second predetermined angle is in the range of 90° to 120°. It is assumed that the line connecting the first position and the rotation center of the tower (100) is the first line, and the line connecting the second position and the rotation center of the tower (100) is the second line. The included angle between the first line and the second line is greater than or equal to 0° and less than or equal to 15°.

9. The hoisting method according to claim 5, characterized in that, The hoisting method also includes: The second position is adjacent to the position of the first fan assembly (210) to be installed. After the lifting equipment (600) moves to the second position, it lifts and installs the first fan assembly (210). The yaw system (200) causes the first connecting structure (310) to yaw along the first direction by a second predetermined angle, so that the first connecting structure moves away from the lifting equipment (600) on the first side of the horizontal direction, and the second connecting structure (320) moves closer to the lifting equipment (600) on the second side of the horizontal direction, whereby the second predetermined angle is greater than or equal to the first predetermined angle. The lifting equipment (600) lifts and installs the second fan assembly (220) at the second position.

10. The hoisting method according to claim 9, characterized in that, The second predetermined angle is in the range of 90° to 120°. It is assumed that the line connecting the first position and the rotation center of the tower (100) is the first line, and the line connecting the second position and the rotation center of the tower (100) is the second line. The included angle between the first line and the second line is greater than or equal to 90° and less than or equal to 120°.

11. The hoisting method according to claim 9, characterized in that, The lifting equipment (600) is mounted on the installation vessel, which includes a plurality of retractable outriggers located below its hull. The straight-line distance between the first position and the second position is greater than the maximum diameter of the circle formed by the plurality of retractable outriggers.

12. A method for hoisting a multi-bladed wind turbine generator set, the multi-bladed wind turbine generator set comprising a tower (100), a first wind turbine assembly (210), a second wind turbine assembly (220), and a first connecting structure (310) and a second connecting structure (320) respectively connecting the first wind turbine assembly (210) and the second wind turbine assembly (220) to the tower (100), wherein the tower (100) is provided with a means for the first connecting structure (310) and the second connecting structure (320) to rotate around the tower (100). A yaw system (200) rotating around a central axis, wherein the first connecting structure (310) includes a first tower connecting section (311) interconnected with the tower (100) and a first wind turbine connecting section (312) connected with the first wind turbine assembly (210), and the second connecting structure (320) includes a second tower connecting section (321) interconnected with the tower (100) and a second wind turbine connecting section (322) connected with the second wind turbine assembly (220), characterized in that, The hoisting method includes: Position the lifting device (600) at a first position within the rotation radius R of the first connecting structure; The tower (100) is lifted and installed using the lifting equipment (600). The first tower connecting section (311) is lifted and installed by the lifting equipment (600) on the first side in the horizontal direction of the lifting equipment (600). The yaw system (200) causes the first tower connection section (311) to yaw by a first predetermined angle in a first direction away from the lifting equipment (600); The second tower connecting section (321) is lifted and installed by the lifting equipment (600) on the second side opposite to the first side in the horizontal direction of the lifting equipment (600). The lifting equipment (600) is moved to a second position within the rotation radius R to install the first wind turbine connecting section (312) and the second wind turbine connecting section (322). Wherein, the second position is farther away from the tower (100) than the first position, and the first predetermined angle ranges from 90° to 120°, and the rotation radius is the maximum outer diameter of the first connecting structure (310) and the second connecting structure (320) rotating around the central axis.

13. The hoisting method according to claim 12, characterized in that, The hoisting method also includes: The second position is adjacent to the position of the second wind turbine connecting section (322) to be installed. After the lifting equipment (600) moves to the second position, the second wind turbine connecting section (322) is lifted and installed by the lifting equipment (600) on the second side of the horizontal direction of the lifting equipment (600) to install the second wind turbine connecting section (322) to the second tower connecting section (321). The first tower connecting section (311) is yawed by a second predetermined angle in a second direction opposite to the first direction by the yaw system (200); The first wind turbine connecting section (312) is lifted and installed on the first side of the horizontal direction of the lifting equipment (600) using the lifting equipment (600) to install the first wind turbine connecting section (312) onto the first tower connecting section (311). The second predetermined angle ranges from 90° to 120°, and the second predetermined angle is greater than or equal to the first predetermined angle. The first position is within the circular area covered by the rotation of the first tower connecting section (311) and the second tower connecting section (321), and the second position is within the annular area covered by the rotation of the first wind turbine connecting section (312) and the second wind turbine connecting section (322).

14. The hoisting method according to claim 13, characterized in that, The second predetermined angle is in the range of 90° to 120°. It is assumed that the line connecting the first position and the rotation center of the tower (100) is the first line, and the line connecting the second position and the rotation center of the tower (100) is the second line. The included angle between the first line and the second line is greater than or equal to 0° and less than or equal to 15°.

15. The hoisting method according to claim 12, characterized in that, The hoisting method also includes: The second position is adjacent to the position of the first wind turbine connecting section (312) to be installed. After the lifting equipment (600) moves to the second position, the first wind turbine connecting section (312) is lifted and installed by the lifting equipment (600) on the first side of the horizontal direction of the lifting equipment (600) so as to install the first wind turbine connecting section (312) to the first tower connecting section (311). The first tower connecting section (311) is yawed by a third predetermined angle along the first direction by the yaw system (200); The second wind turbine connecting section (322) is lifted and installed on the second side of the horizontal direction of the lifting equipment (600) using the lifting equipment (600) to install the second wind turbine connecting section (322) onto the second tower connecting section (321). The third predetermined angle is in the range of 90° to 120° and the first predetermined angle is less than or equal to the third predetermined angle.

16. The hoisting method according to any one of claims 13-15, characterized in that, The first position is in the range of 0.3R to 0.5R, and the second position is in the range of 0.5R to 1.0R.

17. The hoisting method according to claim 15, characterized in that, The third predetermined angle is in the range of 90° to 120°. It is assumed that the line connecting the first position and the rotation center of the tower (100) is the first line, and the line connecting the second position and the rotation center of the tower (100) is the second line. The included angle between the first line and the second line is greater than or equal to 90° and less than or equal to 120°.

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