A support structure for a multi-wheel wind power system and a multi-wheel wind power system

Abstract

This patent discloses a support structure and a wind turbine generator set for a multi-wheel wind power system. It consists of an annular frame and a tower. The annular frame is a closed space truss structure formed by connecting and forming a straight tube truss and an arc tube truss. The number of straight tube trusses and arc tube trusses is the same and at least four. The annular frame is set perpendicular to the horizontal plane and the number is at least two. Multiple annular frames are arranged in the vertical direction to form an annular frame column or arranged in the horizontal direction to form an annular frame row, or arranged in the vertical direction and the horizontal direction at the same time to form an annular frame matrix. The towers are arranged vertically and the number is at least two, and each annular frame is supported by two towers. The structural form of the tower itself ensures the anti-overturning ability. At the same time, the towers are arranged on the left and right sides of the annular frame to fix and support the annular frame, and the annular frames are connected to each other, which increases the integrity of the structure and improves the structural rigidity of the system.

Description

Technical Field

[0001] This patent belongs to the field of wind power generation technology, and specifically relates to a support structure of a multi-wheel wind power system and a multi-wheel wind power system. Background Art

[0002] Cost is a bottleneck problem in the development of global wind power. Large-scale units (increase in single-unit capacity) is the most effective way to solve the cost problem. The continuous development of offshore wind power projects has made large-scale units an inevitable development trend. With the increase in unit capacity, the design of traditional single-impeller wind turbines faces increasingly severe challenges. The unit load increases sharply, and the overlong, overweight blades and over-large torque bring many difficulties to the design, production, manufacturing and installation of various components in the unit (such as variable pitch actuators, bearings, support structures, etc.).

[0003] The multi-rotor wind power system is a new type of wind power equipment that installs multiple smaller impellers in the same supporting structure to achieve the conversion of wind energy into electrical energy. Compared with conventional single-rotor wind turbines, the multi-rotor wind power system does not need to use super-long (hundred-meter-class) and super-heavy blades, and also avoids the appearance of super-large loads, providing a new technical route for the large-scale offshore wind turbines and reducing the cost of the units.

[0004] Vestas of Denmark has proposed a cantilever beam support structure for a multi-wheel wind power system (such as the technical solution disclosed in CN 108700023A). The structure adopted is to add multiple layers of cantilever beams to a conventional cylindrical tower, and each layer of cantilever beams can be installed with two smaller impellers. The inherent disadvantage of the cantilever beam structure is that more material costs are required to improve the support capacity. When the diameter of the smaller impeller increases, the length of the cantilever beam increases accordingly, and the material cost of the cantilever support structure increases sharply according to a nonlinear relationship, affecting the economy of the support structure. Therefore, this cantilever beam solution is not suitable for large and super-large multi-wheel wind power systems with multiple impellers.

[0005] Another form of supporting structure is a large-span space truss structure, and each impeller is installed at the node of the space truss structure. Compared with the aforementioned cantilever beam solution, this structural form reduces the material consumption, but it still does not have a significant advantage in terms of economy. In addition, since the impeller is located at the node of the truss structure, the interlaced rods near the impeller block the incoming wind over a large area, exacerbating the "tower shadow" effect of the supporting structure, increasing the influence of the truss rods on the flow field, and interfering with the airflow near the impeller, thereby affecting the impeller's wind capture and power generation.

[0006] In summary, the current multi-blade wind power system still faces the following problems in the supporting structure:

[0007] 1) The impellers must not interfere with each other, so the support structure has a large span, which results in a large amount of material used and a poor cost control.

[0008] 2) The large-span frame structure must arrange materials in a large space to ensure the stability of the structure. Although the truss structure has a better air leakage effect than the steel cylindrical tower, it still produces a more obvious "tower shadow effect" on the swept surface of the impeller, which not only reduces the kinetic energy of the incoming wind, but also interferes with the flow field movement within the swept surface of the impeller to a certain extent.

[0009] 3) Since multiple impellers need to be arranged in the vertical direction, the support structure has a high height. Its essence is a towering structure. Not only does the support structure have the characteristics of "multi-point loading" when multiple impellers are running at the same time, but the load brought by the operation of the impellers located at a high position will generate a large overturning moment on the support structure. Therefore, higher requirements are placed on the safety and stability of the support structure;

[0010] 4) The load from the impeller is transferred to the foundation through the support structure. The current technical solution uses a staggered support structure, which faces the problem of insufficient anti-overturning ability. A direct and continuous load transfer path is needed to optimize the stiffness of the structure, ensure the anti-overturning ability and control the material consumption. Summary of the invention

[0011] The purpose of this patent is to provide a support structure for a multi-wheel wind power system to solve at least one of the above technical problems. It is characterized by being composed of a ring frame and a tower column;

[0012] The annular frame is a closed space truss structure formed by connecting straight tube trusses and arc tube trusses; wherein the number of the straight tube trusses and the arc tube trusses is the same and at least four; all the arc tube trusses respectively constitute an arched bearing structure and support an impeller of the multi-wheel wind power system through a plurality of cables;

[0013] In the support structure, the annular frames are arranged perpendicular to the horizontal plane and the number is at least two; a plurality of the annular frames are arranged in the vertical direction to form an annular frame column or in the horizontal direction to form an annular frame row, or are arranged in the vertical direction and in the horizontal direction to form an annular frame matrix;

[0014] The tower columns are vertically arranged and the number is at least two, and each of the annular frames is supported by two of the tower columns; the tower columns are space truss structures or plane truss structures.

[0015] In a further technical solution, the cross-sections of the straight tube truss and the curved tube truss are both triangular or quadrilateral; the chord of the straight tube truss is a straight tube, and the chord of the curved tube truss is a curved tube.

[0016] The straight tube trusses are vertically arranged on both sides of the annular frame; and the straight tube trusses are horizontally arranged on the upper part and the lower part of the annular frame.

[0017] In a further technical solution, any one of the annular frames is located between two of the tower columns, and is connected to the tower columns through the straight tube trusses vertically arranged on both sides, thereby forming support for the annular frame by the tower columns.

[0018] Two adjacent annular frames located in the same annular frame row are connected together through the horizontally arranged straight tube trusses.

[0019] Two adjacent annular frame structures located in the same annular frame row are connected together through the vertically arranged straight tube trusses and are connected to the same tower column.

[0020] The geometric center of the annular frame is on the rotation axis of the impeller.

[0021] In a further technical solution, the span of the bottom of the tower column along the direction of the rotation axis of the impeller is greater than the span of the top of the tower column along the direction of the rotation axis of the impeller.

[0022] The distance between any two of the tower columns is equal and the distance between the two tower columns is greater than the diameter of the impeller.

[0023] In a second aspect, a multi-wheel wind power system is provided, wherein the multi-wheel wind power system comprises a support structure of the multi-wheel wind power system.

[0024] The beneficial effects of this patent are: the impeller is fixed on the annular frame by a flexible support method of multiple cables, which reduces the "tower shadow effect" and reduces the interference with the airflow in the impeller sweep circle. The structure of the tower column itself ensures the anti-overturning ability. At the same time, the tower columns are arranged on the left and right sides of the annular frame to fix and support the annular frame, and the annular frames are connected to each other, which increases the integrity of the structure and improves the structural rigidity of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the first comparative solution of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the second comparative scheme of the present invention;

[0027] Figure 3 A schematic diagram of a connection method between an annular frame of a support structure and an impeller according to an embodiment of the present invention;

[0028] Figure 4A schematic diagram of an annular frame and legs of a support structure according to an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of an annular frame of a support structure according to an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of a plane projection of an annular frame of a support structure according to an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of the location of the cables on the annular frame of a support structure according to an embodiment of the present invention;

[0032] Figure 8 A schematic diagram of a comparative scheme of a ring frame of a support structure according to an embodiment of the present invention;

[0033] Fig. 9 A schematic diagram of a ring frame connection of a support structure according to an embodiment of the present invention;

[0034] Fig.10 A schematic diagram of a tower column of a supporting structure according to an embodiment of the present invention;

[0035] Fig.11 A schematic diagram of the cross-sectional relationship between a tower column and a straight tube truss of an annular frame of a supporting structure according to an embodiment of the present invention;

[0036] Fig.12 A schematic diagram of a multi-impeller wind power system according to an embodiment of the present invention;

[0037] Description of Figure Numbers:

[0038] 1. Impeller swept circle, 2. Cantilever beam, 3. Steel cylindrical tower, 4. Space truss, 5. Ring frame, 5.1. Straight tube truss, 5.101. Straight tube truss chord, 5.102. Straight tube truss web, 5.2. Curved tube truss, 6. Impeller, 6.1. Rotation axis of impeller, 7. Cable, 8. Tower column, 8.1. Tower column chord, 8.2. Tower column web, 9. Hexagonal frame.

[0039] It is worth noting that the above drawings are used to illustrate the features of this patent, and are not intended to show any actual structure or reflect the size, relative proportions and other detailed information of various components. In order to more clearly show the principles of this patent and to avoid unnecessary details that make the principles of this patent obscure, the examples in each figure have been simplified. These illustrations will not cause inconvenience to technicians in the relevant field in understanding this patent, and the actual embodiment may include more modules or components. DETAILED DESCRIPTION

[0040] In order to make the purpose and technical solution of the embodiment of this patent clearer, the embodiment of this patent is fully described below in conjunction with the relevant drawings of the embodiment of this patent. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0041] 1. Current technical solutions for supporting structures and technical problems that need to be solved

[0042] Common support structure technical solutions:

[0043] The supporting structure of early multi-impeller wind power systems was influenced by the tower of conventional single-impeller units. Since the 20th century, many of them have been based on the technical solutions of steel cylindrical towers. The most famous one is the cantilever beam support structure proposed by Vestas of Denmark. Figure 1 As shown in the wireframe diagram (for details, please refer to the technical solution disclosed in CN108700023A), the impeller is installed at the end of the cantilever beam (2). If only one steel cylindrical tower (3) is used, then at most two impellers can be installed in each row. In order to avoid interference between the impellers and between the impellers and the steel cylindrical tower (3), the distance between the centers of the impeller sweep circles (1) (all four directions, up, down, left, and right, need to be considered) must be greater than the diameter of the impeller sweep circle (1). In other words, if Figure 1 The impeller diameter in the left view is 60 meters (this assumption is very realistic, because the capacity of the multi-impeller system is increased, the small blades cannot meet the impeller power requirements, and the impeller diameter of each impeller cannot be as small as 5 meters), so the length of each cantilever beam (2) will exceed 30 meters. Due to the operating characteristics of the impeller of the wind turbine generator set, at least the bending moment caused by thrust, the bending moment caused by gravity, and the additional bending moment caused by the impeller diameter will be generated on each cantilever beam (2). For the cantilever beam (2), especially the root of the cantilever beam (2), a lot of material costs must be paid, that is, it must be strong enough to withstand these complex loads. The fixing point of the cantilever beam (2) is on the steel cylindrical tower (3), and the steel cylindrical tower (3) is essentially a cantilever structure. Therefore, the material cost of the entire support structure is high, which is not proportional to the load-bearing capacity obtained.

[0044] Another solution is the space truss structure solution (such as Figure 2As shown in the wireframe diagram given above, each impeller is installed at the node where multiple space trusses (4) intersect. Compared with the cantilever beam scheme mentioned above, this structural form does not use the steel cylindrical tower in the cantilever beam scheme. However, due to the limited support capacity of each space truss (4) (such as bending and torsion resistance), the number of space trusses (4) needs to be increased in many locations to ensure the bearing capacity and stability of the structure. For example Figure 2 As shown, there may be seven trusses within the swept circle (1) of the impeller in the middle of the upper row. For the impeller at this position, the "tower shadow effect" brought by the support structure will obviously interfere with the movement of the airflow within the swept circle (1) of the impeller in the middle of the upper row.

[0045] There are several major technical problems that need to be solved in the current support structure:

[0046] The first technical problem that the support structure needs to solve is to reduce the use of cantilever support. Cantilever support is a common support form in engineering, and is widely used in wind power projects. For example, the support of blades and steel cylindrical towers are classic cantilever support forms. The support structure has the characteristics of a large span, so the cantilever support used will have a very long cantilever length. In addition, cantilever support is at a disadvantage in terms of mechanical stability and fatigue resistance, so cantilever support needs to be avoided as much as possible.

[0047] The second technical problem that the support structure needs to solve is to reduce the windward area of ​​the support structure within the impeller swept surface. However, the impeller cannot be suspended in the air autonomously, so the presence of the support structure within the impeller swept surface is inevitable. The only way to reduce the windward area of ​​the support structure itself is to reduce the interference with the airflow within the impeller swept circle.

[0048] The third technical problem that the supporting structure needs to solve is to effectively increase the anti-overturning capacity, that is, to improve the anti-overturning capacity at a lower cost. Poor anti-overturning capacity is not only a problem faced by the supporting structure in multi-impeller wind power systems, but also a problem that needs to be solved by conventional single-impeller units. The increase in the swept circle area of ​​the impeller, the increase in the tower height (that is, the increase in the cantilever length) and the increase in the unit capacity make it increasingly difficult to "effectively" increase the anti-overturning capacity. The existing technical solution is to increase the bending section of the tower, that is, the tower becomes thicker and thicker. Although this solution is simple and direct, it is difficult to control the cost and it derives many other problems, such as transportation problems. For example Figure 1 and Figure 2 According to the technical solution shown in , the anti-overturning ability can be improved by increasing the outer diameter of the tower, or increasing the specifications and number of trusses, but it is difficult to be "effective".

[0049] 2. Source of the technical solution in this patent

[0050] This patent proposes a new technical solution to solve several major technical problems that need to be solved by the support structure pointed out in the previous chapter.

[0051] First of all, if a rigid support is used to support each impeller in a multi-impeller wind turbine system, then the windward surface area of ​​the support structure within the impeller swept circle will inevitably be too large. Secondly, if part of the support structure is reduced on the windward side of the impeller swept circle, it is easy to have a cantilever support form (for example, Figure 1 in the technical solution).

[0052] With the flexible support of cables, since the windward surface area of ​​each cable is very small (for example, a cable with a cross section of 30 mm), a certain number of cables (for example, 20) will not significantly interfere with the airflow within the impeller sweep circle. Therefore, the technical solution of the ring frame and cables (similar to the "spoke type" proposed earlier, which draws on the structural form of bicycle wheels and Ferris wheels, such as Figure 3 The problem of airflow interference can be solved to a certain extent. And this structure has many load transfer paths, avoiding the appearance of cantilever support impeller.

[0053] The second point to consider is the structural form of the ring frame supported at high altitude, which needs to improve the anti-overturning ability while controlling the material cost. The technical solution adopted in this patent is a plurality of vertically arranged tower columns (8) (such as Figure 4 As shown in the figure, the front-to-back span of each tower column (8) is increased to improve the bending resistance. The ring frame structure is arranged between the two tower columns (8), similar to a simply supported structure. This structure can achieve structural rigidity in multiple dimensions (horizontal direction, front-to-back direction) by reducing the material consumption of a single tower column (8) and increasing the number of tower columns (8), thereby increasing the anti-overturning capability and improving the stability of the structure.

[0054] 3. The core of patent conception

[0055] The core technical features of this patent can be summarized as follows: 1) The impeller is fixed to the annular frame by means of flexible support; 2) The tower column adopts a structural form with a small upper and a large lower span, and the tower columns are arranged on the left and right sides of the annular frame respectively to fix and support the annular frame; 3) The annular frame is connected to each other and to the tower column through a straight tube truss, which increases the integrity of the structure and improves the structural rigidity of the system.

[0056] 4. An embodiment of the support structure

[0057] The supporting structure is mainly composed of an annular frame (5) and a tower column (8).

[0058] An embodiment of the annular frame (5):

[0059] like Figure 5 As shown, the annular frame (5) is a spatial truss structure as a whole. The annular frame (5) is a closed annular structure formed by splicing multiple sections of straight tube trusses (5.1) and curved tube trusses (5.2) end to end. In this embodiment, the straight tube trusses (5.1) and the curved tube trusses (5.2) are both tube truss structures with triangular cross-sections. Specifically, the chords in the straight tube trusses (5.1) are all straight tubes, and the chords of the curved tube trusses (5.2) are bent tubes obtained by bending the straight tubes.

[0060] like Figure 6 As shown in FIG. 1 , if the annular frame (5) is projected onto a plane directly in front of or behind it, the resulting projection shape can be considered to be a polygon composed of arc segments and straight line segments. Figure 6 As shown, in this embodiment, it can also be considered that this polygon is obtained by rounding the vertices of a regular octagon. Figure 3 As shown, the rotation axis (6.1) of the impeller passes through the geometric center of the annular frame (5). In fact, the rotation axis (6.1) of the impeller and the geometric center of the annular frame (5) are axially coincident. The impeller and the annular frame (5) are flexibly connected by a plurality of cables (7). The fixed positions of the cables (7) on the annular frame (5) are all set on the arc tube truss (5.2), such as Figure 7 As shown, in this embodiment, the fixing positions of the cables (7) on the annular frame (5) can be respectively set on the eight arc tube trusses (5.2). The reason why the cables (7) are fixed on the arc tube trusses (5.2) is that when the initial prestress is applied and the impeller is running, the cable force of the cables (7) is transmitted to the arc tube trusses (5.2) on the annular frame (5), which can utilize the stress characteristics of the arch structure to reduce the bending moment load. Figure 8 As shown, compared with the "spoke-type" structure of the hexagonal frame proposed earlier, it is obvious that if the cables are arranged on the edge of the hexagonal frame (9), the bending moment load that each frame section needs to bear increases. In order to avoid this situation, the cable (7) can only be fixed at the vertex of the hexagonal frame (9). However, this arrangement makes the distribution of the cables (7) uneven in the circumferential direction of the impeller swept circle, which leads to an increase in the difficulty of limiting the displacement of the impeller at the other end of the cables (7) and a load concentration problem at the vertex of the hexagonal frame (9).

[0061] The novelties and advantages of the above technical solution are:

[0062] Compared with other rigid connection schemes, the impeller transfers the load to the annular frame arranged around the impeller through multiple cables. The cross-section of the cables is small (the diameter of the cables commonly used in engineering is tens of millimeters), which has little impact on the airflow passing through, reduces the "tower shadow effect", and reduces the interference with the airflow within the impeller's swept circle.

[0063] Compared with the hexagonal frame scheme (honeycomb scheme) proposed earlier, a circular frame is formed by splicing straight tube trusses and arc tube trusses. The overall three-dimensional truss is used to increase the bearing capacity and structural stability. The cables are fixed on the arc tube trusses. On the one hand, the cables are more evenly distributed in the circumferential direction of the impeller swept circle. On the other hand, the arch structure principle of the arc tube truss is used to reduce the bending moment load on the structure.

[0064] Generally, in the ring frame (5), the number of the straight tube trusses (5.1) is at least four. Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, the number of straight tube trusses (5.1) is calculated as a whole, and it can be considered that there are eight sections in total (a section of straight tube trusses shown in the figure can be formed by connecting multiple straight tube trusses in actual engineering, so the eight sections here are calculated as a whole). Among the eight sections of straight tube trusses (5.1), four sections are located at the upper end, lower end, left end and right end of the annular frame (5). Fig. 9 As shown, the straight tube trusses (5.1) at the upper and lower ends are arranged horizontally, and are used to connect two adjacent annular frames (5) above and below. The straight tube trusses (5.1) at the left and right ends are arranged vertically, and are used to connect two adjacent annular frames (5) on the left and right sides, and between the annular frames (5) and the tower column (8).

[0065] like Figure 4 As shown, tower columns (8) are arranged on the left and right sides of each annular frame (5), and the annular frame (5) is connected to the tower columns (8) via straight tube trusses (5.1) located at the left and right ends. After the load of the impeller is transmitted to the annular frame (5), it directly reaches the foundation along the tower columns (8) in the shortest path.

[0066] The novelties and advantages of the above technical solution are:

[0067] Compared with other rigid connection solutions, towers are set on both sides of the ring frame, avoiding the use of cantilever support, and thus avoiding the large-scale centralized use of materials in the support structure (for example, the weight of the steel cylindrical tower in the cantilever beam is significantly higher than that of other components). In addition, multiple towers are arranged on the left and right sides, and multiple ring frames are connected to each other, so that the rigidity of the structure in the left and right directions is strengthened, and the structural stability is also increased.

[0068] Compared with the hexagonal frame solution (honeycomb solution) proposed earlier, the main function of the annular frame (5) is to fix the impeller (while the hexagonal frame solution not only needs to fix the impeller, but also plays the role of supporting the entire structure). The technical solution proposed in this patent decouples the two goals of fixing the impeller and supporting the entire structure. The tower column (8) supports the entire structure, which not only ensures the overall stiffness of the supporting structure, but also allows the load on the annular frame (5) to be transmitted to the foundation in the shortest straight line path (in contrast, in the hexagonal frame solution proposed earlier, the load from the impeller needs to be transmitted to the foundation along the frame in a broken line path).

[0069] An embodiment of a tower column:

[0070] The tower column (8) is the main load-bearing component in the support structure, providing most of the support stiffness for the support structure. Similar to a conventional steel cylindrical tower, the tower column (8) is a tall structure arranged vertically. In this embodiment, the tower column (8) adopts a truss structure, mainly for the convenience of production and manufacturing, fatigue life and cost. In some other embodiments, the tower column can also adopt a structural form similar to the cable tower of a cable-stayed bridge, using reinforced concrete. However, this structural form requires on-site casting and a large amount of construction. Unlike the cable tower in a bridge, the tower column (8) needs to withstand more fatigue loads. Therefore, the technical solution proposed in this patent prefers a tower column (8) with a steel truss structure.

[0071] The tower column (8) plays a role in fixing and supporting the annular frame. The rigidity of the tower column (8) in the front-to-back direction (i.e., along the direction of the rotation axis (6.1) of the impeller) determines whether the annular frame (5) can withstand the loads such as the thrust and bending moment of the impeller. Fig.10 As shown, the span of each tower column (8) at least in the front-to-back direction should be large enough to obtain a good anti-overturning ability. At the same time, as a tall structure, the span of the tower column (8) in the front-to-back direction gradually decreases with the increase of height, thereby improving the rationality of material distribution. In this embodiment, a tower column chord (8.1) is arranged on the front and back sides of the tower column (8), and the two tower column chords (8.1) are directly connected by a plurality of tower column webs (8.2). Fig.11 As shown, at the location where the annular frame (5) is connected to the tower column (8), the distance between the two tower column chords (8.1) of the tower column (8) must be greater than or equal to the span of the cross section of the straight tube truss (5.1) in the annular frame (5) along the front-to-back direction, that is, Fig.11 The distance between two straight tube truss chords (5.101) along the front-to-back direction is shown in .

[0072] The characteristics and advantages of the above technical solution are: at least one tower column chord (8.1) is arranged on both sides of the tower column (8) in the front-to-back direction (i.e., along the direction of the impeller rotation axis), and the two tower column chords (8.1) are connected by a plurality of tower column webs (8.2); the distance between the two tower column chords (8.1) (i.e., the span of the tower column along the direction of the impeller rotation axis, or the span in the front-to-back direction) gradually decreases with increasing height, so that the tower column (8) has sufficient rigidity in the front-to-back direction, and the anti-overturning ability is improved.

[0073] The annular frame (5) is provided with tower columns (8) on both the left and right sides. The tower columns (8) and the annular frame (5) form a support structure that naturally has a large span in the left and right directions. Therefore, each tower column (8) can adopt a smaller span in the left and right directions in order to control the cost of the tower column, and at the same time, there is no need to worry about the support stiffness of the support structure in the left and right directions. In this embodiment, the tower column (8) directly adopts a planar truss solution to minimize the span in the left and right directions. In order to avoid mechanical interference between the blades, the horizontal distance between the tower columns (8) connected on the left and right sides of the annular frame (5) needs to be greater than the diameter of the impeller (6).

[0074] An embodiment of the support structure layout:

[0075] The support structure layout here refers to the layout of the annular frame (5) and the tower column (8). In the new technical solution provided by the present invention, the two functions of fixing the support impeller and providing the support structure rigidity are decoupled to a certain extent: the main function of the annular frame (5) is to fix the support impeller (6), and the main function of the tower column (8) is to provide the support structure rigidity and support the annular frame (5). The tower column (8) is arranged vertically, so the annular frame (5) between the two tower columns (8) must be arranged in a row in the vertical direction. Fig.12 As shown, in this embodiment, it can be seen that the line connecting the hub center (which can also be considered as the center of the annular frame (5)) is perpendicular to the horizontal plane. When there are three or more tower columns, there will be at least two rows of annular frames (5), which can also be considered as the annular frames (5) forming a row arrangement in the horizontal direction. In this embodiment, the height of the center of the annular frames (5) in the same row from the ground is the same. In other embodiments, the height of the center of the annular frame (5) can be adjusted according to specific needs, so that the height of the annular frames (5) in the same row is inconsistent.

[0076] In the description of this patent, it should be noted that the directions or positional relationships indicated by the terms such as "up, down, front, back, left and right" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this patent.

[0077] Unless otherwise specified and limited, the terms "install, connect, connect" in this patent should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0078] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A supporting structure of a multi-wheel wind power system, characterized in that: It consists of a ring frame (5) and a tower column (8); The annular frame (5) is a closed space truss structure formed by connecting straight tube trusses (5.1) and curved tube trusses (5.2); wherein the number of the straight tube trusses (5.1) and the number of the curved tube trusses (5.2) are the same and are at least four; all the curved tube trusses (5.2) respectively form an arched bearing structure and support an impeller (6) of the multi-wheel wind power system through a plurality of cables (7); In the support structure, the annular frames (5) are arranged perpendicular to a horizontal plane and the number is at least two; a plurality of the annular frames (5) are arranged in a vertical direction to form an annular frame column or in a horizontal direction to form an annular frame row, or are arranged in both a vertical direction and a horizontal direction to form an annular frame matrix; The tower columns (8) are arranged vertically and there are at least two of them, and each of the annular frames (5) is supported by two of the tower columns (8); the tower columns (8) are space truss structures or plane truss structures.

2. A supporting structure for a multi-wheel wind power system according to claim 1, characterized in that: The cross-sections of the straight tube truss (5.1) and the curved tube truss (5.2) are both triangular or quadrilateral; the chord rod (5.101) of the straight tube truss is a straight tube, and the chord rod of the curved tube truss (5.2) is a bent tube.

3. The supporting structure of a multi-wheel wind power system according to claim 1, characterized in that: The straight tube trusses (5.1) are vertically arranged on both sides of the annular frame (5); and the straight tube trusses (5.1) are horizontally arranged on the upper part and the lower part of the annular frame (5).

4. A supporting structure for a multi-wheel wind power system according to claim 3, characterized in that: Any one of the annular frames (5) is located between the two tower columns (8), and is connected to the tower columns (8) via the straight tube trusses (5.1) vertically arranged on both sides, thereby forming support for the annular frame (5) by the tower columns (8).

5. The supporting structure of a multi-wheel wind power system according to claim 3, characterized in that: Two adjacent annular frames (5) located in the same annular frame row are connected together via the horizontally arranged straight tube trusses (5.1).

6. The supporting structure of a multi-wheel wind power system according to claim 3, characterized in that: Two adjacent ring frames (5) located in the same ring frame row are connected together via the vertically arranged straight tube trusses (5.1) and are connected to the same tower column (8).

7. The supporting structure of a multi-wheel wind power system according to claim 1, characterized in that: The geometric center of the annular frame (5) is on the rotation axis (6.1) of the impeller.

8. The supporting structure of a multi-wheel wind power system according to claim 7, characterized in that: The span of the bottom of the tower column (8) along the direction of the rotation axis (6.1) of the impeller is greater than the span of the top of the tower column (8) along the direction of the rotation axis (6.1) of the impeller.

9. The supporting structure of a multi-wheel wind power system according to claim 1, characterized in that: The distance between any two of the tower columns (8) is equal, and the distance between the two tower columns (8) is greater than the diameter of the impeller (6).

10. A multi-wheel wind power system, characterized in that: A supporting structure for a multi-wheel wind power system comprising any one of claims 1-9.

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