Installation method of offshore double-impeller wind turbine generator set

Abstract

The embodiment of the present invention provides an installation method for an offshore double-impeller wind turbine generator set, the installation method comprising: erecting a tower, a yaw mechanism, a support structure, a first support frame, and a second support frame on a foundation pile; positioning an installation vehicle on one side of the tower, and hoisting a first nacelle on its front side while facing the first end of the first support frame, so as to hoist and position the first nacelle at the first end of the first support frame; and controlling the yaw mechanism to reciprocate and yaw without displacing the installation vehicle, so as to alternately make the front side of the first end of the second support frame and the front side of the first end of the first support frame approach the installation vehicle, so as to utilize the installation vehicle to hoist the second nacelle and the second impeller on the front side of the first end of the second support frame, and hoist the first impeller on the front side of the first end of the first support frame. The assembly efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a method for installing an offshore double-impeller wind power generator set. Background Art

[0002] At present, in order to reduce the development cost of offshore wind power generation, offshore wind turbines are gradually developing towards large megawatt models. Under the condition of a certain project capacity, the sea area, the number of foundations and wind turbines purchased, and the construction costs can be reduced. Increasing the capacity of a single unit is one direction, but there are some bottlenecks in the design, development, manufacturing, and supply of large units, and the development speed is slow and the development cost is relatively high. Double-impeller wind turbines are another direction for capacity improvement, that is, two impellers are installed on a foundation and tower. However, the installation of offshore double-impeller wind turbines is currently relatively blank. Therefore, it is urgent to propose an installation method for offshore double-impeller wind turbines. Summary of the invention

[0003] One of the purposes of the present invention is to provide an installation method for an offshore double-impeller wind turbine generator set, which is convenient to install and has high installation efficiency.

[0004] According to a first aspect of the present invention, there is provided a method for installing an offshore double-impeller wind turbine generator set, the method comprising: erecting a tower, a yaw mechanism, a support structure, a first support frame and a second support frame on foundation piles; positioning an installation vehicle on one side of the tower, and hoisting a first nacelle on its front side while facing the first end of the first support frame, so as to hoist and position the first nacelle at the first end of the first support frame; and controlling the yaw mechanism to reciprocate and yaw without shifting the installation vehicle, so that the front side of the first end of the second support frame and the front side of the first end of the first support frame are alternately close to the installation vehicle, so as to utilize the installation vehicle to hoist the second nacelle and the second impeller on the front side of the first end of the second support frame, and to hoist the first impeller on the front side of the first end of the first support frame.

[0005] According to the installation method of the offshore double-impeller wind turbine generator set of the present invention, the installation vehicle is first inserted into a pile on one side of the tower and the first nacelle is hoisted on the front side thereof while facing the first end of the first support frame, and then the front side of the first end of the second support frame and the front side of the first end of the first support frame are alternately hoisted close to the installation vehicle in coordination with the yaw mechanism, which can effectively reduce the number of movements of the installation vehicle, save hoisting time, and improve assembly efficiency. Moreover, hoisting the installation vehicle on the front side is conducive to installing and positioning the first nacelle, the second nacelle, the first impeller, and the second impeller on the front side, which is convenient for installation.

[0006] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be obvious from the description, or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0008] Figure 1 A schematic structural diagram of an offshore double-impeller wind turbine generator set according to an embodiment of the present invention is shown;

[0009] Figure 2A A schematic diagram showing the relative positions of the installation vessel and the foundation piles when hoisting the tower, the yaw mechanism and the supporting structure according to an embodiment of the present invention is shown;

[0010] Figure 2B A schematic side view of an installation vessel according to an embodiment of the present invention when hoisting a tower, a yaw mechanism and a supporting structure is shown;

[0011] Figure 3A A schematic diagram showing the relative positions of an installation vessel and foundation piles according to an embodiment of the present invention is shown;

[0012] Figure 3B A schematic diagram showing a structure of installing a winch on a foundation pile and installing a pulley assembly on the top of a supporting structure according to an embodiment of the present invention;

[0013] Figure 4A A schematic top view of an installation vessel, a winch and a pulley assembly according to an embodiment of the present invention when hoisting a second support frame is shown;

[0014] Figure 4B A schematic diagram showing the structure of an installation vessel, a winch and a pulley assembly when hoisting a second support frame according to an embodiment of the present invention is shown;

[0015] Figure 5A A schematic top view of an installation vessel, a winch and a pulley assembly according to an embodiment of the present invention when hoisting a first support frame is shown;

[0016] Figure 5B A schematic diagram showing the structure of an installation vessel, a winch and a pulley assembly when hoisting a first support frame according to an embodiment of the present invention is shown;

[0017] Fig. 6A A schematic top view of an installation vessel according to an embodiment of the present invention when hoisting a first nacelle is shown;

[0018] Figure 6B A schematic side view of an installation vessel according to an embodiment of the present invention when hoisting a first engine room is shown;

[0019] Fig. 7A A schematic top view of an installation vessel according to an embodiment of the present invention when hoisting a second engine room is shown;

[0020] Figure 7B A schematic side view of an installation vessel according to an embodiment of the present invention when hoisting a second engine room is shown;

[0021] Fig. 8A A schematic top view of an installation vessel in accordance with an embodiment of the present invention when hoisting a second impeller is shown;

[0022] Figure 8B A schematic side view of an installation vessel in accordance with an embodiment of the present invention when hoisting a second impeller is shown;

[0023] Figure 8C A schematic top view of assembling a second impeller on a deck of an installation vessel in one embodiment of the present invention is shown;

[0024] Fig.9A A schematic top view of an installation vessel according to an embodiment of the present invention when hoisting a first impeller is shown;

[0025] Fig. 9B A schematic side view of an installation vessel according to an embodiment of the present invention when hoisting a first impeller is shown;

[0026] Fig. 9C A schematic top view of assembling a second impeller on a deck of an installation vessel in one embodiment of the present invention is shown;

[0027] Fig.10 A side schematic diagram of an installation vessel according to another embodiment of the present invention is shown when hoisting a first support frame, a second support frame and an entire support structure.

[0028] Figures 1 to 10 Description of Figure Numbers:

[0029] 1 foundation pile,

[0030] 2 towers,

[0031] 3 Yaw mechanism,

[0032] 4 Support structure,

[0033] 51 first support frame, 511 first main beam, 5111 first section main beam, 5112 second section main beam, 512 first auxiliary beam, 5121 first section auxiliary beam, 5122 second section auxiliary beam, 513 first vertical beam, 52 second support frame, 521 second main beam, 5211 third section main beam, 5212 fourth section main beam, 522 second auxiliary beam, 5221 third section auxiliary beam, 5222 fourth section auxiliary beam, 523 second vertical beam,

[0034] 6 First Cabin,

[0035] 7 Second cabin,

[0036] 8First impeller,

[0037] 9 Second impeller,

[0038] 11 winch, 111 motor, 112 lifting rope,

[0039] 12 pulley assembly, 121 main fixed pulley mechanism, 122 steering fixed pulley mechanism, 123 auxiliary fixed pulley mechanism,

[0040] 13 guardrails,

[0041] 14 skylight,

[0042] 15 Install the vehicle,

[0043] 16 transport vehicles. DETAILED DESCRIPTION

[0044] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0045] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present application.

[0046] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0047] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion referred to in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.

[0048] In the specification, when an element such as a layer, a region or a substrate is described as being “on”, “connected to” or “coupled to” another element, the element may be directly “on”, “connected to” or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to” or “directly coupled to” another element, other elements may not be present therebetween.

[0049] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof. The term "plurality" represents any number of two and more than two.

[0050] The definitions of directional terms such as "above", "below", "top" and "bottom" in this application are all based on the directional definitions of the product in normal use.

[0051] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs after understanding the present invention. Unless explicitly defined as such herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and the present invention, and should not be interpreted in an idealized or overly formal way.

[0052] Furthermore, in the description of the examples, when it is considered that a detailed description of a well-known related construction or function will cause vague interpretation of the present invention, such a detailed description will be omitted.

[0053] At present, offshore wind power has entered the era of parity. In order to reduce the cost of wind power development, offshore wind turbines are gradually developing towards large megawatt models. Under the condition of a certain project capacity, the sea area, the number of foundations and wind turbines purchased, and the construction costs can be reduced. Increasing the capacity of a single unit is one direction, but there are some bottlenecks in the design, development, manufacturing, and supply of large units, and the development speed is slow and the development cost is relatively high. Therefore, the present invention turns to another direction and develops an offshore double-impeller wind turbine.

[0054] The offshore double-impeller wind turbine generator set (hereinafter referred to as the double-impeller unit) is to install two impellers on the base of a tower 2 and above the tower 2, and drive a generator 111 to operate respectively. For example, if you want to expand the power of a single unit to 16MW, you can install two 8MW heads on the double-impeller unit. The double-impeller unit has at least the following advantages: 1) It can increase the unit capacity of a single unit and reduce the development cost of the wind farm; 2) There are no 13MW, 16MW or even 20MW heads on the market, but the 8MW and 10MW heads are relatively mature in the market. Compared with the development of large megawatt models, the development speed of double-impeller units is faster and the cost is lower. Moreover, the relatively stable 8MW and 10MW heads are not new heads and have higher reliability. Therefore, the double-impeller unit technology can be based on the existing mature heads. From the perspective of maximizing the power generation of a single unit, facing the future market demand for single-unit large-capacity units, the "double-impeller" technology can be used to quickly double the power generation of a single unit.

[0055] For wind turbines in the era of electricity parity, the market has invested in the development of new technology research and development directions for 13MW, 16MW and 20MW models, while the dual-impeller unit technology has not received overall attention from the market, and there is no prototype of a dual-impeller unit on the market. It can be seen that dual-impeller units are a way to reduce the cost of wind farm construction in the era of electricity parity. The development of an offshore dual-impeller unit and its supporting hoisting solution is an urgent need for the current offshore wind power market.

[0056] The following will be combined Figures 1 to 10 An offshore double-impeller wind turbine generator set and an installation method thereof provided by an embodiment of the present invention are introduced.

[0057] Figure 1 The invention shows an offshore double-impeller wind turbine generator set installed by using the installation method of the offshore double-impeller wind turbine generator set disclosed in the present invention. Figure 1As shown, the offshore double-blade wind turbine generator set includes a foundation pile 1, a tower 2 arranged on the foundation pile 1, a yaw mechanism 3 arranged on the top of the tower 2, a support structure 4 arranged on the top of the yaw mechanism 3, a first support frame 51 arranged on the first side of the support structure 4, a second support frame 52 arranged on the second side of the support structure 4, a first nacelle 6 and a first impeller 8 arranged at the first end of the first support frame 51, and a second nacelle 7 and a second impeller 9 arranged at the first end of the second support frame 52. The first impeller 8 and the second impeller 9 face the same side of the foundation pile 1, which is the front side by default. Among them, the generator of the semi-direct-drive wind turbine generator set is in the nacelle, and the generator of the direct-drive wind turbine generator set is outside the nacelle. Therefore, the nacelle referred to in this application can refer to the nacelle containing the generator in the case of a semi-direct-drive wind turbine generator set, and can refer to the combination of the nacelle and the generator of the direct-drive wind turbine generator set in the case of a direct-drive wind turbine generator set.

[0058] The tower 2 is installed on the foundation pile 1 at sea, and is used to support the yaw mechanism 3, the support structure 4, the first support frame 51, the first nacelle 6, the first impeller 8, the second support frame 52, the second nacelle 7 and the second impeller 9.

[0059] In one or more embodiments, the yaw mechanism 3 is mounted on the top of the tower 2 via a flange, and is used to drive the entire double impeller and its supporting components thereon to rotate, so that the first impeller 8 and the second impeller 9 can face the main wind direction to generate electricity.

[0060] In one or more embodiments, the support structure 4 is mounted on the yaw mechanism 3 via a flange to support the first support frame 51 and the second support frame 52 on both sides, as well as the first nacelle 6, the first impeller 8, the second nacelle 7 and the second impeller 9.

[0061] In one or more embodiments, the second end of the first support frame 51 is mounted on the first side of the support structure 4 through a flange, the first end of the first support frame 51 has a first mounting platform, the first nacelle 6 is mounted on the first mounting platform, the first generator is disposed on the first nacelle 6, and the first impeller 8 is disposed on the first nacelle 6 and connected to the first generator. The connection is stable and reliable.

[0062] In one or more embodiments, the second end of the second support frame 52 is mounted on the second side of the support structure 4 through a flange, the first end of the second support frame 52 has a second mounting platform, the second nacelle 7 is mounted on the second mounting platform, the second generator is disposed on the second nacelle 7, and the second impeller 9 is disposed on the second nacelle 7 and connected to the second generator. The connection is stable and reliable.

[0063] Regarding the structures of the first support frame 51 and the second support frame 52, in the first specific embodiment, the first support frame 51 includes a first main beam 511 and a first flexible beam, the first main beam 511 is a rigid beam, the second end of the first main beam 511 is connected to the support structure 4 through a flange, the first end of the first main beam 511 is connected to the first end of the first flexible beam, and the second end of the first flexible beam is connected to the support structure 4. The second support frame 52 includes a second main beam 521 and a second flexible beam, the second main beam 521 is a rigid beam, the second end of the second main beam 521 is connected to the support structure 4 through a flange, the first end of the second main beam 521 is connected to the first end of the second flexible beam, and the second end of the second flexible beam is connected to the support structure 4. Then the first flexible beam, the first main beam 511 and the support structure 4 are connected to form a triangle, which can stably support the first nacelle 6, the first generator and the first impeller 8. Similarly, the second flexible beam, the second main beam 521 and the support structure 4 are connected to form a triangle, which can stably support the second nacelle 7, the second generator and the second impeller 9. Moreover, the first flexible beam is used as the first auxiliary beam 512, and the second flexible beam is used as the second auxiliary beam 522, which is light and convenient for transportation and hoisting. Moreover, since the flexible beam can be bent or straightened and unfolded, it is convenient to connect with the support structure 4, the first main beam 511 and the second main beam 521.

[0064] In order to facilitate hoisting and reduce the weight of a single hoisting, the first main crossbeam 511 and the second main crossbeam 521 can be made into multiple sections, which are spliced ​​together after being hoisted in sections.

[0065] Furthermore, the first end of the first main beam 511 is higher than the second end of the first main beam 511, and the first end of the first flexible beam is lower than the second end of the first flexible beam. Compared with the first end of the first flexible beam being higher than the second end of the first flexible beam, the tension on the first flexible beam can be reduced, the connection stability can be ensured, and the second end of the first flexible beam is at a higher position, which is convenient for the first flexible beam to be connected to the support structure 4. Similarly, the first end of the second main beam 521 is higher than the second end of the second main beam 521, and the first end of the second flexible beam is lower than the second end of the second flexible beam. The tension on the second flexible beam can be reduced, the connection stability can be ensured, and the connection between the second flexible beam and the support structure 4 can be convenient.

[0066] In the second specific embodiment, different from the above-mentioned first specific embodiment, the first auxiliary beam 512 and the second auxiliary beam 522 are rigid beams. The first end of the first main beam 511 and the first end of the first auxiliary beam 512 are connected by a flange, and the second end of the first auxiliary beam 512 is connected to the support structure 4 by a flange. The first end of the second main beam 521 and the first end of the second auxiliary beam 522 are connected by a flange, and the second end of the second auxiliary beam 522 is connected to the support structure 4 by a flange.

[0067] In order to facilitate hoisting and reduce the weight of a single hoisting, the first main beam 511 and the second main beam 521 can be made into multiple sections, which are hoisted in sections and spliced ​​together. The first auxiliary beam 512 and the second auxiliary beam 522 can also be made into multiple sections, which are hoisted in sections and spliced ​​together. Figure 1 As shown, the first main beam 511 includes a first section of the main beam 5111 and a second section of the main beam 5112, and the first auxiliary beam 512 includes a first section of the auxiliary beam 5121 and a second section of the auxiliary beam 5122. The second end of the first section of the main beam 5111 is connected to the support structure 4 through a flange, the first end of the first section of the main beam 5111 is connected to the second end of the second section of the main beam 5112 through a flange, the first end of the second section of the main beam 5112 is connected to the first end of the second section of the auxiliary beam 5122 through a flange, the second end of the second section of the auxiliary beam 5122 is connected to the first end of the first section of the auxiliary beam 5121 through a flange, and the second end of the first section of the auxiliary beam 5121 is connected to the support structure 4 through a flange. The second main beam 521 includes a third section of the main beam 5211 and a fourth section of the main beam 5212, and the second auxiliary beam 522 includes a third section of the auxiliary beam 5221 and a fourth section of the auxiliary beam 5222. The second end of the third-section main beam 5211 is connected to the supporting structure 4 via a flange, the first end of the third-section main beam 5211 is connected to the second end of the fourth-section main beam 5212 via a flange, the first end of the fourth-section main beam 5212 is connected to the first end of the fourth-section auxiliary beam 5222 via a flange, the second end of the fourth-section auxiliary beam 5222 is connected to the second end of the third-section auxiliary beam 5221 via a flange, and the first end of the third-section auxiliary beam 5221 is connected to the supporting structure 4 via a flange.

[0068] In addition, to reduce weight and facilitate hoisting, the cross-sectional area of ​​the first main beam 511 can be larger than the cross-sectional area of ​​the first auxiliary beam 512, and the cross-sectional area of ​​the second main beam 521 can be larger than the cross-sectional area of ​​the second auxiliary beam 522. The thin-at-top-and-thick-at-bottom structure reduces the overall weight while ensuring support stability.

[0069] In addition, to ensure the support strength, a first vertical beam 513 may be provided between the first main beam 511 and the first auxiliary beam 512, for example, the first vertical beam 513 is connected between the first section of the main beam 5111 and the first section of the auxiliary beam 5121 through a flange. A second vertical beam 523 is provided between the second main beam 521 and the second auxiliary beam 522, for example, the second vertical beam 523 is connected between the third section of the main beam 5211 and the third section of the auxiliary beam 5221 through a flange. The first vertical beam 513 and the second vertical beam 523 can support the main beam and the auxiliary beam, thereby facilitating the improvement of the support stability of the first support frame 51 and the second support frame 52. The first vertical beam 513 and the second vertical beam 523 extend vertically, and of course, may also extend slightly inclined.

[0070] A guardrail 13 is provided on the outer periphery of the top of the support structure 4 to ensure the safety of the staff working on the top of the support structure 4. In addition, when it is necessary to install a pulley assembly 12 on the top of the support structure 4, a guardrail 13 is also provided on the outer periphery of the pulley assembly 12, such as the outer periphery of the main fixed pulley mechanism 121 and the outer periphery of the auxiliary fixed pulley mechanism 123, to ensure the safety of the staff. A skylight 14 that can be opened and closed can also be provided on the top of the support structure 4, and a ladder is provided inside the support structure 4, and the top of the ladder is close to the skylight 14, so that the staff can come to the top of the support structure 4 through the ladder and the skylight 14 to perform corresponding operations.

[0071] The offshore double-impeller wind turbine generator set installed by the installation method of the offshore double-impeller wind turbine generator set disclosed in this embodiment has double impellers. From the perspective of maximizing the power generation of a single unit, it can quickly double the power generation of a single unit in response to the future market demand for single-unit large-capacity units. It will not increase the area of ​​sea acquisition and the number of foundations, thus reducing costs. Moreover, it can be based on existing mature impellers, and compared with large-capacity units to be developed in the future, it can be developed faster, at a lower cost, and with higher reliability.

[0072] In the following, taking the offshore double-blade wind turbine generator set in which the first auxiliary beam 512 and the second auxiliary beam 522 are flexible beams in the first specific embodiment as an example, the installation ship is selected as the installation vehicle 15, and the transport ship is selected as the transport vehicle 16. FIG. 2A to FIG. 9C , introduces the installation method of the offshore double-impeller wind turbine generator set of the first embodiment of the present invention. It should be noted that, for the convenience of description, the direction of the installed double impellers is the front direction, and the front direction of the entire offshore double-impeller wind turbine generator set, that is, the front direction, and the front sides of the various components of the offshore double-impeller wind turbine generator set are on the same side as the front side of the entire set.

[0073] Step 1: erect the tower 2, yaw mechanism 3, and support structure 4 on the foundation pile 1. Specifically, the installation vessel is inserted into the pile on one side of the foundation pile 1, and is preliminarily close to or located in front of the position where the first end of the second support frame 52 is hoisted, and the tower 2, yaw mechanism 3, and support structure 4 are hoisted by the installation vessel. Figure 2A and Figure 2B , Figure 2AThe diagram shows the relative position of the installation vessel and the foundation pile 1 when hoisting the tower 2, the yaw mechanism 3 and the support structure 4. At this time, the pile insertion position of the installation vessel is located on one side of the foundation pile 1. The installation vessel maintains a distance of approximately the lateral extension length of the second support frame 52 from the foundation pile 1 in the extension direction when the second support frame 52 is hoisted, and the installation vessel is also located in front of the first end of the second support frame 52 when it is hoisted, which is convenient for the subsequent use of the installation vessel to hoist the second support frame 52 from the front side, and to hoist the second nacelle 7, the second generator, the second impeller 9 and other components on the front side of the first end of the second support frame 52, so that the installation is convenient. Figure 2B The side view of the installation vessel when hoisting the tower 2, the yaw mechanism 3 and the support structure 4 is shown. The support structure 4 is pre-installed on the top of the yaw mechanism 3, and the yaw mechanism 3 is pre-installed on the top of the tower 2. The installation vessel hoists the support structure 4, the yaw mechanism 3 and the tower 2 at the same time, simplifying the hoisting steps. At this time, a hanging structure can be set on the top of the support structure 4 to cooperate with the hook of the installation vessel. Of course, if the hoisting load capacity of the installation vessel is insufficient, the tower 2, the yaw mechanism 3 and the support structure 4 can also be hoisted in sequence, or the tower 2 and the yaw structure can be hoisted at the same time, and then the support structure 4 can be hoisted.

[0074] As an example, the yaw mechanism 3 is flange-connected to the top of the tower 2, and the support structure 4 is flange-connected to the top of the yaw mechanism 3. The yaw mechanism 3 is located at the top of the tower 2 to support the double impeller and its supporting components, which is conducive to driving the double impeller and its supporting components to yaw and rotate as a whole, so that the double impeller faces the main wind direction to generate electricity.

[0075] Step 2: Set up the first support frame 51 and the second support frame 52. The details are as follows:

[0076] Step 2.1: Use a transport ship to transport the first support frame 51 and the second support frame 52 to between the installation ship and the foundation pile 1. This is beneficial for the first support frame 51 and the second support frame 52 to be within the lifting radius of the installation ship, and is beneficial for the subsequent installation ship and the pulling rope 112 passing through the pulley assembly 12 to respectively lift and connect the two ends of the first support frame 51 and the two ends of the second support frame 52, thereby stably lifting the first support frame 51 and the second support frame 52.

[0077] Furthermore, the first support frame 51 includes a first main beam 511 and a first flexible beam, and the second support frame 52 includes a second main beam 521 and a second flexible beam. The first main beam 511, the first flexible beam, the second main beam 521 and the second flexible beam are transported by a transport ship, so that they can be independently hoisted later.

[0078] As an example, the first support frame 51 and the second support frame 52 are transported to the middle area between the foundation pile 1 and the installation ship by using a transport ship. Figure 4A , Figure 4AA top view schematic diagram of the installation vessel, the winch 11 and the pulley assembly 12 when hoisting the second support frame 52 is shown. At this time, the transport vessel is located in the middle area between the installation vessel and the foundation pile 1, which is conducive to smoothly hoisting the second support frame 52.

[0079] Step 2.2: Install the winch 11 on the foundation pile 1, install the pulley assembly 12 on the top of the support structure 4, and let the pull rope 112 on the winch 11 pass through the pulley assembly 12 and then be lowered to the transport ship. Figure 3A As shown, the installation vessel does not shift.

[0080] As an example, refer to Figure 3B , the pulley assembly 12 includes a main fixed pulley mechanism 121, a deflection fixed pulley mechanism 122 and an auxiliary fixed pulley mechanism 123. The winch 11 is controlled by a motor 111, and the main fixed pulley mechanism 121 is installed directly above the winch 11. The auxiliary fixed pulley mechanism 123 is installed at the top of the support structure 4 near the second side, that is, near the side where the second support frame 52 is to be installed. The deflection fixed pulley mechanism 122 is installed in the middle of the top of the support structure 4. The traction rope is lowered from the top of the main fixed pulley mechanism 121 and the support structure 4 to the winch 11, and the traction rope is connected to the end of the lifting rope 112 on the winch 11. The lifting rope 112 is pulled to the main fixed pulley by pulling the traction rope, and the lifting rope 112 passes through the main fixed pulley mechanism 121, the deflection fixed pulley mechanism 122 and the auxiliary fixed pulley mechanism 123 in sequence and then lowered from the auxiliary fixed pulley mechanism 123.

[0081] As an example, with the position of the deflection fixed pulley mechanism 122 as the center of the circle, the central angles of the main fixed pulley mechanism 121 and the auxiliary fixed pulley mechanism 123 relative to the deflection fixed pulley mechanism 122 range from 80° to 110°.

[0082] Furthermore, if Figure 3B As shown, the central angle of the main fixed pulley mechanism 121 and the auxiliary fixed pulley mechanism 123 relative to the deflection fixed pulley mechanism 122 is approximately 90°.

[0083] Step 2.3: Connect the pulling rope 112 to the second end of the second support frame 52, and the installation ship does not move, so that the installation ship hoists the first end connected to the second support frame 52. The winch 11 and the installation ship cooperate with each other to lift the second support frame 52, and install and position the second end of the second support frame 52 on the second side of the support structure 4. Figure 4A FIG. 1 shows a top view of the installation vessel, the winch 11 and the pulley mechanism when the second support frame 52 is hoisted. Figure 4A , Figure 3A and Figure 2A The installation vessel does not move. Since the process of inserting and pulling out the legs of the installation vessel takes about 12 hours, controlling the installation vessel to remain stationary greatly saves installation time and improves installation efficiency. Figure 4B The schematic diagram of the structure of the installation vessel, the winch 11 and the pulley assembly 12 when the second support frame 52 is hoisted is shown. Figure 4B , use the winch 11 and the pulling rope 112 to connect the two ends of the second support frame 52 respectively for lifting, and the lifting is stable. Figure 4A When the second support frame 52 is hoisted, the first support frame 51 is still left on the transport ship to be hoisted.

[0084] Specifically, in the process of using the winch 11 and the installation ship to cooperate with each other to lift the second support frame 52, the second main beam 521 and the second auxiliary beam 522 are lifted separately in sequence. First, the pulling rope 112 is connected to the second end of the second main beam 521. Under the condition that the installation ship does not shift, the installation ship is hoisted to connect the first end of the second main beam 521. The winch 11 and the installation ship cooperate with each other to lift the second main beam 521, and the second end of the second main beam 521 is installed and positioned on the second side of the support structure 4. Then, the pulling rope 112 is connected to the second end of the second flexible beam. Under the condition that the installation ship does not shift, the installation ship is hoisted to connect the first end of the second flexible beam. The winch 11 and the installation ship cooperate with each other to lift the second flexible beam, and the second end of the second flexible beam is installed and positioned on the second side of the support structure 4, and the first end of the second flexible beam is installed and positioned on the first end of the second main beam 521.

[0085] Step 2.4: The installation vessel does not shift, and the yaw mechanism 3 is controlled to yaw in the second direction by a third set angle, so that the installation vessel is located on one side of the tower 2, and is pre-close to or located in front of the position where the first end of the first support frame 51 is hoisted, and the pulling rope 112 is connected to the second end of the first support frame 51, so that the installation vessel is hoisted and connected to the first end of the first support frame 51, and the winch 11 and the installation vessel cooperate with each other to lift the first support frame 51, and the second end of the first support frame 51 is installed and positioned on the first side of the support structure 4. Figure 5A FIG. 1 shows a top view of the installation vessel, the winch 11 and the pulley assembly 12 when the first support frame 51 is hoisted. Figure 5A and Figure 4A , the installation vessel does not shift, which greatly saves installation time and improves installation efficiency. Figure 5B The schematic diagram of the structure of the installation vessel, the winch 11 and the pulley assembly 12 when the first support frame 51 is hoisted is shown. Figure 5B The winch 11 and the pulling rope 112 are respectively connected to the two ends of the first support frame 51 for lifting, and the lifting is stable.

[0086] Specifically, refer to Figure 5A, the value range of the third setting angle is 120° to 130°, such as 123°, 128°, etc., so that the structure on the support structure 4 that is about to be connected to the first support frame 51 faces the transport ship, which is convenient for lifting and positioning the first support frame 51. Specifically, when the yaw mechanism 3 is controlled to yaw the third setting angle along the second direction, a part of the installation ship is preliminarily close to or located in front of the position when the first end of the first support frame 51 is lifted. It is conducive to lifting the first support frame 51 from the front side, that is, the front side, and the subsequent front lifting of the first nacelle 6, the first generator and the first impeller 8, which is convenient for installation.

[0087] In addition, after the step of controlling the yaw mechanism 3 to yaw along the second direction by the third set angle and before the step of connecting the pull rope 112 to the second end of the first support frame 51, the method further includes: adjusting the position of the auxiliary fixed pulley mechanism 123 so that the auxiliary fixed pulley mechanism 123 is close to and faces the first side of the support structure 4. Figure 5A As shown, the auxiliary pulley mechanism 123 is close to and faces the first side of the support structure 4, so as to facilitate the connection of the pulling rope 112 with the second end of the first support frame 51 after being lowered from the pulley mechanism.

[0088] In addition, in the process of using the winch 11 and the installation ship to cooperate with each other to lift the first support frame 51, the first main beam 511 and the first auxiliary beam 512 are lifted separately in sequence. Specifically, the pulling rope 112 is first connected to the second end of the first main beam 511, so that the installation ship is hoisted and connected to the first end of the first main beam 511, the winch 11 and the installation ship cooperate with each other to lift the first main beam 511, and the second end of the first main beam 511 is installed and positioned on the first side of the support structure 4. Then, the pulling rope 112 is connected to the second end of the first flexible beam, so that the installation ship is hoisted and connected to the first end of the first flexible beam, the winch 11 and the installation ship cooperate with each other to lift the first flexible beam, and the second end of the first flexible beam is installed and positioned on the first side of the support structure 4, and the first end of the first flexible beam is installed and positioned on the first end of the first main beam 511.

[0089] Step 3: Position the installation vessel at one side of the tower 2, and hoist the first nacelle 6 at the front side thereof while facing the first end of the first support frame 51, that is, hoist the first nacelle 6 at the front side of the first end of the first support frame 51, so as to hoist and position the first nacelle 6 at the first end of the first support frame 51. Since the installation vessel has been moved to the front side close to or located at the first end of the first support frame 51 in the last step 2.4 of the above step 2, there is no need to move the installation vessel in step 3, and the first nacelle 6 can be hoisted directly at the front side using the installation vessel. Fig. 6A , Fig. 6A FIG. 1 shows a schematic top view of the installation vessel when the first engine room 6 is being hoisted. Fig. 6A and Figure 5AIt can be seen that the installation vessel does not shift, which reduces the number of times the installation vessel moves and saves installation time. In addition, a part of the installation vessel is close to or located in front of the first end of the first support frame 51, so that the first nacelle 6, the first generator and the first impeller 8 can be installed in a close distance and in a positive direction, ensuring the stability of the hoisting and facilitating the installation. Figure 6B The side view schematic diagram of the installation vessel when hoisting the first nacelle 6 is shown. Specifically, the first nacelle 6 and the first generator can be hoisted successively. For example, the yaw mechanism 3 is not moved and is directly hoisted for the second time. Another example is that the yaw mechanism 3 is rotated to make the first end of the first support frame 51 close to the installation vessel again and then the first generator is hoisted. Of course, the first nacelle 6 and the first generator can also be hoisted at the same time. It should be noted that in the present application, as long as the front side of the first end of the first support frame 51 and the front side of the first end of the second support frame 52 are facing a part of the installation vessel, it is convenient for the installation vessel to hoist from the front side, that is, the front side, to meet the technical concept of the present application. It is not necessary for the entire installation vessel to be completely located at the front side of the first end of the first support frame 51 and the front side of the first end of the second support frame 52.

[0090] Step 4: Under the condition that the installation vessel does not shift, the yaw mechanism 3 is controlled to reciprocate and yaw and rotate, so that the front side of the first end of the second support frame 52 and the front side of the first end of the first support frame 51 are alternately close to the installation vessel, so that the installation vessel can be used to hoist the second nacelle 7 and the second impeller 9 at the front side of the first end of the second support frame 52, and hoist the first impeller 8 at the front side of the first end of the first support frame 51. Since the installation vessel does not need to move, the installation time is greatly saved and the installation efficiency is improved. The details are as follows:

[0091] Step 4.1: Control the yaw mechanism 3 to yaw in the first direction by a first set angle, so that the front side of the first end of the second support frame 52 is close to the installation vessel, and the installation vehicle 15 hoists the second nacelle 7 on its front side while facing the first end of the second support frame 52, that is, hoists the second nacelle 7 on the front side of the first end of the second support frame 52, so as to hoist and position the second nacelle 7 on the first end of the second support frame 52. Fig. 7A , Fig. 7A The schematic diagram of the top view when the second engine room 7 is installed by the installation ship is shown. Fig. 7A and Fig. 6A After the yaw mechanism 3 yaws along the first direction by the first set angle, the installation vessel is located at the front side of the first end of the second support frame 52, which is conducive to installing the second cabin 7 from the front side and the front, and the installation is convenient. Figure 7B The side view schematic diagram when the installation ship hoists the second nacelle 7 is shown. Specifically, the second nacelle 7 and the second generator can be hoisted successively, for example, the yaw mechanism 3 is not moved and is directly hoisted for the second time, and for example, the yaw mechanism 3 is rotated to make the first end of the second support frame 52 close to the installation ship again before hoisting the second generator. Of course, the second nacelle 7 and the second generator can also be hoisted at the same time.

[0092] Furthermore, the first set angle has a value range of 120° to 130°.

[0093] Step 4.2: The installation carrier 15 is facing the second nacelle 7, and the second impeller 9 is hoisted on the front side thereof, that is, the second impeller 9 is hoisted on the front side of the second nacelle 7, so as to hoist and position the second impeller 9 on the second nacelle 7. Specifically, the second impeller 9 can be assembled on the deck of the installation vessel first and then hoisted, and the installation vessel does not move. FIG. 8A to FIG. 8C , Figure 8C FIG. 1 shows a top view of assembling the second impeller 9 on the deck of the installation vessel. Fig. 8A FIG. 1 shows a schematic top view of the installation vessel when hoisting the second impeller 9. Figure 8B A side view schematic diagram of the installation vessel when hoisting the second impeller 9 is shown.

[0094] Step 4.3: Control the yaw mechanism 3 to yaw by a second set angle in a second direction opposite to the first direction, so that the front side of the first end of the first support frame 51 is close to the installation vessel, and the installation vehicle 15 hoists the first impeller 8 on the front side thereof while facing the first end of the first support frame 51, that is, hoists the first impeller 8 on the front side of the first end of the first support frame 51, so as to hoist and position the first impeller 8 on the first nacelle 6. Fig.9A , Fig.9A The schematic diagram of the top view when the first impeller 8 is installed on the installation ship is shown. Fig.9A and Fig. 8A After the yaw mechanism 3 yaws along the second direction by the second set angle, a part of the installation vessel is located in front of the first end of the first support frame 51, which is conducive to installing the first impeller 8 from the front side and the front, and the installation is convenient. Fig. 9B A side view schematic diagram of the installation vessel hoisting the first impeller 8 is shown.

[0095] Furthermore, before the step of hoisting the first impeller 8 at the front side, the method further includes: assembling the first impeller 8 on the deck of the installation ship. Fig. 9C , Fig. 9C The schematic top view shows the assembly of the second impeller 9 on the deck of the installation vessel.

[0096] Furthermore, the value range of the second setting angle is 120° to 130°. The first setting angle and the second setting angle can be made the same, that is, the yaw mechanism 3 can be moved back and forth at equal angles, which is convenient to control and helps to ensure the distance between the installation ship and the first end of the first support frame 51 and the first end of the second support frame 52 after yaw. Of course, the first setting angle and the second setting angle can also be different. The two angles can be adjusted according to actual needs so that the front side of the first end of the first support frame 51 and the front side of the first end of the second support frame 52 can be closer to the installation ship.

[0097] The above steps are used to complete the installation of an offshore double-impeller wind turbine generator set. First, the installation ship is inserted into a pile on one side of the tower 2 and the first end of the first support frame 51 is hoisted on its front side. Then, the yaw mechanism 3 is used to alternately make the front side of the first end of the second support frame 52 and the front side of the first end of the first support frame 51 close to the installation ship for hoisting. With the help of auxiliary equipment such as the winch 11 and the fixed pulley mechanism, it is ensured that the position of the installation ship has not been moved from beginning to end during the entire installation process, which greatly improves the installation efficiency of the double impeller. Moreover, hoisting the installation vehicle on the front side is conducive to the installation and positioning of the first nacelle, the second nacelle, the first impeller and the second impeller on the front side, which is convenient for installation.

[0098] With respect to the offshore double-impeller wind turbine generator set in which the first auxiliary crossbeam 512 and the second auxiliary crossbeam 522 are flexible beams in the first specific embodiment described above, the installation method of the offshore double-impeller wind turbine generator set in the second embodiment of the present invention is as follows:

[0099] Step 1: Select a floating crane as a floating crane vehicle, and use the floating crane to pre-install the tower 2, the yaw mechanism 3 and the support structure 4 on the foundation pile 1.

[0100] Step 2: Make the installation vessel insert the pile on one side of the foundation pile 1 and pre-position it in front of the position of the first end of the second support frame 52 when it is hoisted, and refer to step 2 in the first embodiment for hoisting.

[0101] The remaining steps are the same as those in the first embodiment described above.

[0102] The installation method of the offshore double-impeller wind turbine generator set in the third embodiment of the present invention for the offshore double-impeller wind turbine generator set in which the first auxiliary crossbeam 512 and the second auxiliary crossbeam 522 are flexible beams in the first specific embodiment is as follows:

[0103] Step 1: Make the installation vessel approach the foundation pile 1 to insert the pile, and use the installation vessel to hoist the tower 2 and the yaw mechanism 3 onto the foundation pile 1.

[0104] Step 2: Assemble the first support frame 51, the second support frame 52 and the support structure 4 on land and transport them to the sea. Under the condition that the installation ship does not shift, use the installation ship to hoist and position the first support frame 51, the second support frame 52 and the support structure 4 as a whole on the yaw mechanism 3. Fig.10 , Fig.10 A side view schematic diagram is shown when the installation vessel hoists the first support frame 51, the second support frame 52 and the support structure 4 as a whole. At this time, a hanging mechanism can be set on the top of the support structure 4 to cooperate with the hook of the installation vessel through the hanging structure.

[0105] Step 3: The installation vessel is positioned at the front side of the first support frame 51 for inserting piles, and the distance between the installation vessel and the foundation pile 1 in the extension direction of the first support frame 51 is approximately equal to the lateral extension length of the first support frame 51. The first nacelle 6 is hoisted and positioned at the first end of the first support frame 51 at the front side by the installation vessel.

[0106] Step 4: Under the condition that the installation vessel does not shift, the yaw mechanism 3 is controlled to reciprocate and yaw and rotate, so that the front side of the first end of the second support frame 52 and the front side of the first end of the first support frame 51 are alternately close to the installation vessel, so that the installation vessel can be used to hoist the second nacelle 7 and the second impeller 9 at the front side of the first end of the second support frame 52, and to hoist the first impeller 8 at the front side of the first end of the first support frame 51. For details, please refer to step 4 in the first embodiment above.

[0107] In this embodiment, the installation vessel only moves twice to insert piles, which reduces the installation time and improves the installation efficiency. In addition, the first support frame 51, the second support frame 52 and the support structure 4 are assembled together and then hoisted as a whole, which simplifies the hoisting steps and facilitates installation.

[0108] For the offshore double-blade wind turbine generator set of the second specific embodiment mentioned above, since the first auxiliary beam 512 and the second auxiliary beam 522 are rigid beams, the installation method of the offshore double-blade wind turbine generator set of the fourth embodiment of the present invention can refer to the hoisting steps of the first flexible beam and the second flexible beam for hoisting, and the first auxiliary beam 512 replaces the first flexible beam, and the second auxiliary beam 522 replaces the second flexible beam. The remaining steps can be the same as the hoisting method of the first embodiment mentioned above.

[0109] The installation method of the offshore double-impeller wind turbine generator set of the fifth embodiment of the present invention can refer to the hoisting method of the offshore double-impeller wind turbine generator set of the second embodiment mentioned above, and the first auxiliary beam 512 replaces the first flexible beam, and the second auxiliary beam 522 replaces the second flexible beam.

[0110] The installation method of the offshore double-impeder wind turbine generator set of the sixth embodiment of the present invention is different from the first embodiment mentioned above in that, in step 2, after the first support frame 51 and the second support frame 52 are assembled on land, the first support frame 51 and the second support frame 52 are transported to between the installation ship and the foundation pile 1 by a transport ship. Alternatively, the first support frame 51 and the second support frame 52 are assembled on the transport ship and transported to between the installation ship and the foundation pile 1. For example, the second main beam 521 and the second auxiliary beam 522 are assembled together, or the second main beam 521, the second auxiliary beam 522 and the second vertical beam 523 are assembled together. The first main beam 511 and the first auxiliary beam 512 are assembled together, or the first main beam 511, the first auxiliary beam 512 and the first vertical beam 513 are assembled together. This facilitates the subsequent overall hoisting of the first support frame 51 and the second support frame 52, thereby reducing the number of hoisting times. Reference FIG. 4A to FIG. 5B The winch 11 and the installation vessel cooperate with each other to lift the first support frame 51 and the second support frame 52 as a whole.

[0111] The remaining steps may be the same as the method for hoisting the offshore double-impeder wind turbine generator set of the first embodiment described above.

[0112] In the installation method of the offshore double-impeller wind turbine generator set of the seventh embodiment of the present invention, in order to reduce the weight of a single hoisting, the first main beam 511, the first auxiliary beam 512, the second main beam 521 and the second auxiliary beam 522 can also be made into multiple sections, which are spliced ​​together after being hoisted in sections. Referring to the hoisting method of the offshore double-impeller wind turbine generator set of the first embodiment described above, in step 2, the third section of the main beam 5211, the fourth section of the main beam 5212, the fourth section of the auxiliary beam 5222, the third section of the auxiliary beam 5221, the second vertical beam 523, the first section of the main beam 5111, the second section of the main beam 5112, the second section of the auxiliary beam 5122, the first section of the auxiliary beam 5121 and the first vertical beam 513 are hoisted in sequence.

[0113] Specifically, in the process of hoisting the first main beam 511, the first section of the main beam 5111 is hoisted first and connected to one side of the support structure 4 through a flange, and then the second section of the main beam 5112 is hoisted and connected to the first section of the main beam 5111 through a flange. In the process of hoisting the first auxiliary beam 512, the second section of the auxiliary beam 5122 is hoisted first and connected to the second section of the main beam 5112 through a flange, and then the first section of the auxiliary beam 5121 is hoisted and one end of the first section of the auxiliary beam 5121 is connected to the second section of the auxiliary beam 5122 through a flange, and the other end of the first section of the auxiliary beam 5121 is connected to the support structure 4 through a flange.

[0114] In the process of hoisting the second main beam 521, the third section of the main beam 5211 is hoisted first and connected to one side of the support structure 4 through a flange, and then the fourth section of the main beam 5212 is hoisted and connected to the third section of the main beam 5211 through a flange. In the process of hoisting the second auxiliary beam 522, the fourth section of the auxiliary beam 5222 is hoisted first and connected to the fourth section of the main beam 5212 through a flange, and then the third section of the auxiliary beam 5221 is hoisted and one end of the third section of the auxiliary beam 5221 is connected to the fourth section of the auxiliary beam 5222 through a flange, and the other end of the third section of the auxiliary beam 5221 is connected to the support structure 4 through a flange.

[0115] After the steps of successively hoisting the first main beam 511 and the first auxiliary beam 512, the first vertical beam 513 is hoisted, and the two ends of the first vertical beam 513 are respectively connected to the first section of the main beam 5111 and the first section of the auxiliary beam 5121. After the steps of successively hoisting the second main beam 521 and the second auxiliary beam 522, the second vertical beam 523 is hoisted, and the two ends of the second vertical beam 523 are respectively connected to the third section of the main beam 5211 and the third section of the auxiliary beam 5221.

[0116] The remaining steps may be the same as the method for hoisting the offshore double-impeder wind turbine generator set of the first embodiment described above.

[0117] Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims.

Claims

1. A method for installing an offshore double-impeller wind turbine generator set, characterized in that: The installation method comprises: A tower (2), a yaw mechanism (3), a support structure (4), a first support frame (51), and a second support frame (52) are erected on the foundation pile (1); The installation vehicle (15) is positioned on one side of the tower (2), and the first nacelle (6) is hoisted on the front side thereof with the installation vehicle (15) facing the first end of the first support frame (51), so as to hoist and position the first nacelle (6) on the first end of the first support frame (51); Under the condition that the mounting carrier (15) does not shift, the yaw mechanism (3) is controlled to reciprocate and yaw and rotate, so that the front side of the first end of the second support frame (52) and the front side of the first end of the first support frame (51) are alternately close to the mounting carrier (15), so as to utilize the mounting carrier (15) to hoist the second nacelle (7) and the second impeller (9) at the front side of the first end of the second support frame (52) that is close to it, and to hoist the first impeller (8) at the front side of the first end of the first support frame (51) that is close to it; The steps of erecting the first support frame (51) and the second support frame (52) include: using a transport vehicle (16) to transport the first support frame (51) and the second support frame (52) to between the installation vehicle (15) and the foundation pile (1); installing a winch (11) on the foundation pile (1), installing a pulley assembly (12) on the top of the support structure (4), and allowing the pulling rope (112) on the winch (11) to pass through the pulley assembly (12) and then be lowered to the transport vehicle (16); connecting the pulling rope (112) to the second end of the second support frame (52), and under the condition that the installation vehicle (15) does not shift, the installation vehicle (15) is hoisted to connect the first end of the second support frame (52), and the winch (11) and the installation vehicle (15) cooperate with each other to lift the second support frame (52). The second support frame (52) is installed and positioned at the second side of the support structure (4); under the condition that the installation vehicle (15) does not shift, the yaw mechanism (3) is controlled to yaw at a third set angle along the second direction, so that the installation vehicle (15) is located on one side of the tower (2) and is preliminarily close to or located in front of the position where the first end of the first support frame (51) is hoisted, the pulling rope (112) is connected to the second end of the first support frame (51), so that the installation vehicle (15) is hoisted and connected to the first end of the first support frame (51), the winch (11) and the installation vehicle (15) cooperate with each other to lift the first support frame (51), and the second end of the first support frame (51) is installed and positioned on the first side of the support structure (4); The pulley assembly (12) comprises a main fixed pulley mechanism (121), a steering fixed pulley mechanism (122) and an auxiliary fixed pulley mechanism (123); The step of installing the pulley assembly (12) on the top of the support structure (4) comprises: installing the main fixed pulley mechanism (121) directly above the winch (11), installing the auxiliary fixed pulley mechanism (123) at a position on the top of the support structure (4) close to the second side, and installing the deflection fixed pulley mechanism (122) in the middle of the top of the support structure (4), with the position of the deflection fixed pulley mechanism (122) as the center of the circle, so that the central angle of the main fixed pulley mechanism (121) and the auxiliary fixed pulley mechanism (123) relative to the deflection fixed pulley mechanism (122) ranges from 80° to 110°; The step of passing the pulling rope (112) on the winch (11) through the pulley assembly (12) comprises: lowering a traction rope to the winch (11) from the top of the main fixed pulley mechanism (121) and the support structure (4), connecting the traction rope to the end of the pulling rope (112) on the winch (11), pulling the traction rope to pull the pulling rope (112) to the main fixed pulley, passing the pulling rope (112) through the main fixed pulley mechanism (121), the steering fixed pulley mechanism (122) and the auxiliary fixed pulley mechanism (123) in sequence, and then lowering the pulling rope from the auxiliary fixed pulley mechanism (123).

2. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The step of erecting a tower (2), a yaw mechanism (3) and a support structure (4) on the foundation pile (1) comprises: inserting the installation vehicle (15) on one side of the foundation pile (1) and being close to or located in advance in front of the position of the first end of the second support frame (52) when it is hoisted, and hoisting the tower (2), the yaw mechanism (3) and the support structure (4) using the installation vehicle (15).

3. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The step of erecting a tower (2), a yaw mechanism (3) and a support structure (4) on the foundation pile (1) comprises: using a floating crane to pre-install the tower (2), the yaw mechanism (3) and the support structure (4) on the foundation pile (1).

4. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The step of using a transport vehicle (16) to transport the first support frame (51) and the second support frame (52) to between the installation vehicle (15) and the foundation pile (1) comprises: Assembling the first support frame (51) and the second support frame (52) on land; The first support frame (51) and the second support frame (52) are transported to a middle area between the foundation pile (1) and the installation vehicle (15) using the transport vehicle (16).

5. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The central angle of the main fixed pulley mechanism (121) and the auxiliary fixed pulley mechanism (123) relative to the deflection fixed pulley mechanism (122) is approximately 90°; The third setting angle has a value range of 120° to 130°; After the step of controlling the yaw mechanism (3) to yaw along the second direction at a third set angle and before the step of connecting the pulling rope (112) to the second end of the first support frame (51), the method further includes: adjusting the position of the auxiliary fixed pulley mechanism (123) so that the auxiliary fixed pulley mechanism (123) is close to and faces the first side of the support structure (4).

6. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The first support frame (51) comprises a first main crossbeam (511) and a first auxiliary crossbeam (512), the second end of the first main crossbeam (511) is connected to the support structure (4), the first end of the first main crossbeam (511) is connected to the first end of the first auxiliary crossbeam (512), and the second end of the first auxiliary crossbeam (512) is connected to the support structure (4); the second support frame (52) comprises a second main crossbeam (521) and a second auxiliary crossbeam (522), the second end of the second main crossbeam (521) is connected to the support structure (4), the first end of the second main crossbeam (521) is connected to the first end of the second auxiliary crossbeam (522), and the second end of the second auxiliary crossbeam (522) is connected to the support structure (4); In the process of using the winch (11) and the mounting carrier (15) to cooperate with each other to lift the second support frame (52), the second main beam and the second auxiliary beam are lifted separately in sequence; In the process of using the winch (11) and the mounting vehicle (15) to cooperate with each other to lift the first support frame (51), the first main beam and the first auxiliary beam are lifted separately and successively.

7. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The steps of controlling the yaw mechanism (3) to reciprocate in yaw rotation so that the front side of the first end of the second support frame (52) and the front side of the first end of the first support frame (51) are alternately close to the installation vehicle (15), so as to use the installation vehicle (15) to hoist the second nacelle (7) and the second impeller (9) at the front side of the first end of the second support frame (52) close to the second nacelle (7) and the second impeller (9), and to hoist the first impeller (8) at the front side of the first end of the first support frame (51) close to the first nacelle (52), comprise: Controlling the yaw mechanism (3) to yaw at a first set angle along a first direction, so that the front side of the first end of the second support frame (52) is close to the installation vehicle (15), and the installation vehicle (15) hoists the second nacelle (7) at its front side while facing the first end of the second support frame (52), so as to hoist and position the second nacelle (7) at the first end of the second support frame (52); The mounting carrier (15) is facing the second nacelle (7), and hoisting the second impeller (9) on the front side thereof, so as to hoist and position the second impeller (9) on the second nacelle (7); The yaw mechanism (3) is controlled to yaw at a second set angle in a second direction opposite to the first direction, so that the front side of the first end of the first support frame (51) is close to the installation vehicle (15), and the installation vehicle (15) hoists the first impeller (8) on its front side while facing the first end of the first support frame (51), so as to hoist and position the first impeller (8) on the first nacelle (6).

8. The installation method of an offshore double-impeller wind turbine generator set according to claim 7, characterized in that: The first setting angle has a value range of 120° to 130°, the second setting angle has a value range of 120° to 130°, and / or the first setting angle and the second setting angle are the same; Before the step of hoisting the second impeller (9) at the front side, the method further comprises: assembling the second impeller (9) on the deck of the mounting vehicle (15); Before the step of hoisting the first impeller (8) at the front side, the step further includes: assembling the first impeller (8) on the deck of the mounting vehicle (15).

9. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: The first support frame (51) comprises a first main crossbeam (511) and a first auxiliary crossbeam (512), the second end of the first main crossbeam (511) is connected to the support structure (4), the first end of the first main crossbeam (511) is connected to the first end of the first auxiliary crossbeam (512), and the second end of the first auxiliary crossbeam (512) is connected to the support structure (4); The second support frame (52) comprises a second main crossbeam (521) and a second auxiliary crossbeam (522), the second end of the second main crossbeam (521) being connected to the support structure (4), the first end of the second main crossbeam (521) being connected to the first end of the second auxiliary crossbeam (522), and the second end of the second auxiliary crossbeam (522) being connected to the support structure (4); Wherein, the first end of the first main beam (511) is higher than the second end of the first main beam (511), the first end of the first auxiliary beam (512) is lower than the second end of the first auxiliary beam (512), the cross-sectional area of ​​the first main beam (511) is larger than the cross-sectional area of ​​the first auxiliary beam (512), the first end of the second main beam (521) is higher than the second end of the second main beam (521), the first end of the second auxiliary beam (522) is lower than the second end of the second auxiliary beam (522), and the cross-sectional area of ​​the second main beam (521) is larger than the cross-sectional area of ​​the second auxiliary beam (522).

10. The installation method of an offshore double-impeller wind turbine generator set according to claim 9, characterized in that: The first auxiliary crossbeam (512) and the second auxiliary crossbeam (522) are both rigid beams or both flexible beams; Based on the situation that the first auxiliary crossbeam (512) and the second auxiliary crossbeam (522) are both rigid beams, the first support frame (51) further includes a first vertical beam (513), the first vertical beam (513) is connected to the first main crossbeam (511) and the first auxiliary crossbeam (512) through a flange, and the second support frame (52) further includes a second vertical beam (523), the second vertical beam (523) is connected to the second main crossbeam (521) and the second auxiliary crossbeam (522) through a flange.

11. The installation method of an offshore double-impeller wind turbine generator set according to claim 10, characterized in that: Based on the situation that the first auxiliary beam (512) and the second auxiliary beam (522) are both rigid beams, the first main beam (511) includes a first section of the main beam (5111) and a second section of the main beam (5112), the first auxiliary beam (512) includes a first section of the auxiliary beam (5121) and a second section of the auxiliary beam (5122), the second main beam (521) includes a third section of the main beam (5211) and a fourth section of the main beam (5212), and the second auxiliary beam (522) includes a third section of the auxiliary beam (5221) and a fourth section of the auxiliary beam (5222); The second end of the first section main beam (5111) is connected to the support structure (4) via a flange, the first end of the first section main beam (5111) is connected to the second end of the second section main beam (5112) via a flange, the first end of the second section main beam (5112) is connected to the first end of the second section auxiliary beam (5122) via a flange, the second end of the second section auxiliary beam (5122) is connected to the first end of the first section auxiliary beam (5121) via a flange, and the second end of the first section auxiliary beam (5121) is connected to the support structure (4) via a flange; The second end of the third section main beam (5211) is connected to the support structure (4) via a flange, the first end of the third section main beam (5211) is connected to the second end of the fourth section main beam (5212) via a flange, the first end of the fourth section main beam (5212) is connected to the first end of the fourth section auxiliary beam (5222) via a flange, the second end of the fourth section auxiliary beam (5222) is connected to the second end of the third section auxiliary beam (5221) via a flange, and the first end of the third section auxiliary beam (5221) is connected to the support structure (4) via a flange; The first vertical beam (513) is connected to the first section of the main cross beam (5111) and the first section of the auxiliary cross beam (5121) via a flange, and the second vertical beam (523) is connected to the third section of the main cross beam (5211) and the third section of the auxiliary cross beam (5221) via a flange.

12. The installation method of an offshore double-impeller wind turbine generator set according to claim 1, characterized in that: A guardrail (13) is provided on the outer periphery of the top of the support structure (4), the outer periphery of the main fixed pulley mechanism (121), and the outer periphery of the auxiliary fixed pulley mechanism (123); and / or An openable and closable skylight (14) is provided on the top of the support structure (4), and a ladder is provided inside the support structure (4), with the top of the ladder being close to the skylight (14).

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