A tower transition section of a wind turbine and a wind turbine

Abstract

The present invention discloses a tower transition section of a wind turbine and a wind turbine. It includes main chord members and steel conical surface tiles. The steel conical surface tiles connect two adjacent main chord members. A flange section is provided at the top of the steel conical surface tiles, which can be connected to the circular flange of the upper structure of the tower transition section of the wind turbine. A second connecting flange is provided at the bottom of the main chord member. The steel conical surface tiles are provided with a plurality of diagonal ribs. The first part of the diagonal ribs is arranged on the concave surface of the steel conical surface tiles, and the second part is arranged on the convex surface. The diagonal ribs on the convex surface and the concave surface are symmetric about the longitudinal bisecting position of the steel conical surface tiles. The transition section of this solution realizes the transition from the continuous load-bearing of the cylindrical tower to the discrete load-bearing of the lattice tower. At the same time, the steel conical surface tiles are easy to manufacture. The diagonal ribs added on both sides solve the problem of insufficient torsional resistance in the existing solution. While maximizing the bending and torsional resistance capabilities, the cost is well controlled, ensuring the economy of the tower.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a tower adapter section of a wind turbine set and a wind turbine set. Background Art

[0002] Wind power is the most valuable and commercially viable power generation method in the renewable energy sector. Available wind energy is widely distributed around the world and has huge reserves.

[0003] Wind turbines use blades to convert the kinetic energy of air molecules into mechanical energy and ultimately electrical energy. Generally, the higher the average wind speed in a given time, the more electrical energy the wind turbine generates. In the field of wind power generation technology, the annual average wind speed at the hub center height is usually used to calculate the annual power generation of the wind turbine to evaluate the benefits, etc. Due to vertical wind shear, the higher the height, the greater the wind speed and the greater the annual average wind speed. Therefore, modern wind turbines continue to increase their hub center height, not only to ensure a safe distance between the blade tip and the ground after the blades are continuously lengthened, but more importantly, a higher hub center height can achieve a greater wind speed, thereby obtaining higher power generation benefits. The increase in hub center height requires an increase in the height of the tower. The most widely used tower form in the wind power industry is the steel cylindrical tower. From the perspective of technical feasibility alone, there is no problem in continuing to use the steel cylindrical tower solution to increase the height of the tower. However, it is not enough for the wind power industry to only consider technical feasibility.

[0004] As the capacity of wind turbines increases, the blades become longer. The load on the unit (i.e., the load acting on the top of the tower) becomes larger and larger. The increase in the height of the tower requires the tower's bearing capacity to adapt to the increase in the unit load, especially the load at the bottom of the tower (for example, the closer to the root of the tower, the greater the bending moment). First, the wall thickness of the steel cylindrical tower needs to be increased, and secondly, the cross-sectional diameter of the steel cylindrical tower needs to be increased to obtain greater bending resistance. The result is that the weight of the tower increases sharply (increasing in a nonlinear relationship with the height of the tower), and the cost of the tower increases significantly. At the same time, the outer diameter of the tower section of the steel cylindrical tower is too large, and the domestic road transportation conditions cannot be met, the transportation cost increases significantly, and there are even cases where transportation is impossible.

[0005] To address the problems faced by conventional steel cylindrical towers in manufacturing, transportation, installation, and cost, the wind power industry has proposed many solutions. One of them is the currently popular steel-concrete tower technology. A steel-concrete tower refers to using a conventional steel cylindrical tower for the part close to the nacelle of the wind turbine generator, and as much as possible using a concrete tower below the steel cylindrical tower. Due to the low-cost characteristics of the concrete tower, the economic advantage of the entire steel-concrete tower is obvious. However, the long-term continuous and irregular operation of the wind turbine generator requires the tower to consider the fatigue life problem, and the anti-fatigue characteristics of concrete are far inferior to those of metals. Therefore, irreversible fatigue damage will occur after the steel-concrete tower has been operating for some time, posing potential risks to reliability and safety.

[0006] Another solution is the composite tower. The part close to the nacelle of the wind turbine generator uses a conventional steel cylindrical tower, and a lattice tower is used below the steel cylindrical tower to improve the economy of the entire composite tower through the low-cost advantage of the lattice tower. Different from the above-mentioned steel-concrete tower, a transition section (or adapter section) needs to be added between the steel cylindrical tower and the lattice tower because the material of the steel cylindrical tower is continuously distributed, while the material of the lattice tower is discretely distributed; and the cross-section of the steel cylindrical tower is circular, while the cross-section of the lattice tower is triangular or polygonal. How to handle the transition section is the key to the success of the composite tower technology. The existing transition section technology uses a flange at the upper part to connect with the bottom of the cylindrical tower, and the bottom or side of the transition section is directly connected to the chord members of the lattice tower, similar to the structure used in the fixed foundation of offshore wind power. Such solutions only meet the connection requirements for both the connection from the cylindrical tower to the lattice tower and the transition and adaptation, and do not consider issues such as the change in the form of load transfer from the cylindrical tower to the lattice tower. This simple and direct connection is likely to cause a sudden change in structural stiffness at the transition section of the entire composite tower, and the bending and torsional resistance of the transition section itself is insufficient. Coupled with the poor torsional resistance of the lattice tower itself, it further causes problems such as excessive displacement of the tower under load, or structural stress concentration or stress overrun, ultimately leading to structural failure. Summary of the Invention

[0007] To at least solve one of the above technical problems, in a first aspect, a transition section for a wind turbine tower is provided, which is characterized by comprising at least three main chord members and at least three steel conical surface tiles;

[0008] The steel conical surface tiles connect two adjacent main chord members. The two sides of the steel conical surface tiles are used to connect with the main chord members, and each side of each main chord member is connected to two steel conical surface tiles respectively;

[0009] A flange section is provided at the top of the steel conical surface tiles, and all the flange sections together form a first connection flange, which can be connected to the circular flange of the upper structure of the transition section of the wind turbine tower;

[0010] A second connecting flange is provided at the bottom of the main chord.

[0011] The steel conical surface tile is provided with a plurality of inclined ribs. The first part of each inclined rib is arranged on the concave surface of the steel conical surface tile, and the second part of the inclined rib is arranged on the convex surface of the steel conical surface tile.

[0012] The longitudinal bisecting position of the steel conical surface tile is located between the two side edges of the steel conical surface tile, and the steel conical surface tiles on both sides of the longitudinal bisecting position are symmetric about the longitudinal bisecting position.

[0013] The first part of the inclined rib extends from the first side edge of the steel conical surface tile along the concave surface of the steel conical surface tile to the longitudinal bisecting position, and the second part of the inclined rib extends from the longitudinal bisecting position along the convex surface of the steel conical surface tile to the second side edge of the steel conical surface tile.

[0014] In a further technical solution, the end faces of the tops of all the main chords and the top end faces of all the flange sections are coplanar.

[0015] In a further technical solution, the flange section is connected to the bottom flange of the cylindrical tower of the wind turbine, or the base circular flange, or the yaw slewing bearing flange.

[0016] In a further technical solution, an auxiliary flange section is further provided below the flange section of the steel conical surface tile, and the auxiliary flange section is connected to two adjacent flange sections at the same time.

[0017] The two side edges of the steel conical surface tile and the main chord are connected in a detachable or non-detachable manner.

[0018] The convex surface of each steel conical surface tile is arranged towards the outside of the transition section of the wind turbine tower.

[0019] The inclined ribs arranged on the concave surface of the steel conical surface tile are symmetric about the longitudinal bisecting position.

[0020] The inclined ribs arranged on the convex surface of the steel conical surface tile are symmetric about the longitudinal bisecting position.

[0021] The second connecting flange is connected to the chord flange of the lattice tower of the wind turbine.

[0022] In a second aspect, a wind turbine is provided, and the wind turbine includes the above-mentioned transition section of the wind turbine tower.

[0023] The beneficial effects of the present invention are as follows: Compared with the existing transition sections of the combined tower, its load-bearing and load-transfer structure is more reasonable. The proposed transition section of the wind turbine tower realizes the transition from continuous loading of the cylindrical tower to discrete loading of the lattice tower through the connection between the chord members and the steel conical surface tiles. At the same time, the new component, the steel conical surface tile, is easy to manufacture. The diagonal ribs added on both sides of the steel conical surface tile solve the problem of insufficient torsional resistance in the existing technical solutions for the transition section. Moreover, the proposed transition section maximizes the bending and torsional resistance while well controlling the cost, ensuring the economy of the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the connection of a combined tower formed by a transition section of a wind turbine tower according to an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the structure of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the connection relationship of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0027] Figure 4 Front view of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the diagonal ribs of the steel conical surface tile of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0029] Figure 6 Side view of the steel conical surface tile of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the partial extension of the diagonal rib structure of the steel conical surface tile of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the top flange section of the steel conical surface tile of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0032] Figure 9 Schematic diagram of the auxiliary flange section of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0033] Figure 10 Schematic diagram of the longitudinal flange connection of a transition section of a wind turbine tower according to an embodiment of the present invention;

[0034] Figure 11 Schematic diagram of the symmetrical distribution of the diagonal ribs of the steel conical surface tile of a transition section of a wind turbine tower according to an embodiment of the present invention.

[0035] Explanation of the reference numerals in the drawings:

[0036] 1. Wind turbine tower transition section, 1.1. Main chord, 1.11. Top end face of the main chord, 1.12. Second longitudinal flange, 1.2. Steel conical surface tile, 1.21. Side, 1.22. Convex surface, 1.23. Concave surface, 1.24. Diagonal rib, 1.241. First part of the diagonal rib, 1.242. Second part of the diagonal rib, 1.25. Flange section, 1.26. Longitudinal bisecting position, 1.27. First longitudinal flange, 1.3. First connecting flange, 1.4. Second connecting flange, 1.5. Auxiliary flange section, 2. Cylindrical tower, 3. Lattice tower.

[0037] It should be noted that the above-mentioned drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or reflect details such as the dimensions and relative proportions of various components. In order to more clearly show the principle of the present invention and to avoid obscuring the principle of the present invention with unnecessary details, the examples in each figure have been simplified. These drawings will not cause inconvenience to those skilled in the relevant art when understanding this patent, and the actual embodiments may include more modules or components. Detailed implementation mode

[0038] For the purpose of making the objectives and technical solutions of the embodiments of the present invention clearer, the following will describe the embodiments of the present invention in a complete manner in combination with the relevant drawings of the embodiments of the present invention. This patent only describes a part of the embodiments, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0039] An embodiment of the wind turbine tower transition section

[0040] As Figure 1 shown, the wind turbine tower transition section (1) includes four main chords (1.1) and four steel conical surface tiles (1.2). In this embodiment, the top of the wind turbine tower transition section (1) is flange-connected to the bottom of the cylindrical tower (2) of the wind turbine, and its lower part is connected to the lattice tower (3), forming a combined tower. The top of the cylindrical tower (2) is provided with the nacelle of the wind turbine. In other embodiments, the wind turbine tower transition section (1) can also be connected to the circular flange of the base of the wind turbine or the yaw slewing bearing flange. It should be noted that the main chord (1.1) in this embodiment is a steel pipe with a circular cross-section, which is a relatively common profile. In some other embodiments, according to actual application requirements, the main chord (1.1) can be selected in other cross-sectional forms, including uncommon special cross-sectional forms.

[0041] As Figure 2 andFigure 3 As shown, the steel conical surface tiles (1.2) are used in the wind turbine tower transition section (1) to connect two adjacent main chord members (1.1). In actual applications, common steel plates can be used as raw materials for the steel conical surface tiles (1.2), which are manufactured by rolling. The two sides (1.21) of the steel conical surface tiles (1.2) are used to connect with the main chord members (1.1). In this embodiment, its top is connected to the bottom of the cylindrical tower (2). It can be seen that due to the limitation of the connection relationship, the number of steel conical surface tiles (1.2) is the same as that of the main chord members (1.1). As Figure 4 shown, a flange section (1.25) is provided at the top of the steel conical surface tile (1.2). All the flange sections (1.25) together form the first connection flange (1.3), which can be connected to the circular flange of the upper structure of the wind turbine tower transition section (1). A second connection flange (1.4) is provided at the bottom of the main chord member (1.1) for connection with the lower lattice tower (3) below. Due to the connection and cooperation between the main chord member (1.1) and the steel conical surface tile (1.2), the transition from the cylindrical tower (2) to the transition section (1) and then to the lattice tower (3) below the transition section is very natural. The outer surface of the structure formed by the steel conical surface tile (1.2) and the main chord member (1.1) continues the geometric form of the upper cylindrical tower (2). At the same time, because of the characteristic that the tower cross-section is "small at the top and large at the bottom", the outer surface of the steel conical surface tile (1.2) is a part of the conical surface rather than a part of the cylindrical surface, and the name of the steel conical surface tile (1.2) comes from this.

[0042] As Figure 5 and Figure 6 shown, a plurality of inclined ribs (1.24) are provided on both the concave surface (1.23) and the convex surface (1.22) of the steel conical surface tile (1.2). The first part (1.241) of each inclined rib is provided on the concave surface (1.23) of the steel conical surface tile (1.2), while the second part (1.242) of each inclined rib is provided on the convex surface (1.22) of the steel conical surface tile (1.2). It can be regarded that a complete inclined rib (1.24) is simultaneously provided on the concave surface (1.23) and the convex surface (1.22) of the steel conical surface tile (1.2).

[0043] As Figure 5 shown, the longitudinal bisecting position (1.26) of the steel conical surface tile (1.2) is located between the two sides (1.21) of the steel conical surface tile (1.2). The steel conical surface tiles (1.2) on both sides of the longitudinal bisecting position (1.26) are symmetric about the longitudinal bisecting position (1.26), or in other words, the longitudinal bisecting position (1.26) can divide the steel conical surface tile (1.2) longitudinally into two equal parts.

[0044] As Figure 5 andFigure 7 As shown, the first part (1.241) of the diagonal rib starts from the first side (1.21) of the steel conical surface tile (1.2) and extends along the concave surface (1.23) of the steel conical surface tile (1.2) to the longitudinal bisecting position (1.26), and the second part (1.242) of the diagonal rib starts from the longitudinal bisecting position (1.26) and extends on the convex surface (1.22) of the steel conical surface tile (1.2) to the second side (1.21) of the steel conical surface tile (1.2).

[0045] As Figure 2 and Figure 3 shown, due to the structural relationship between the main chord (1.1) and the steel conical surface tile (1.2), the diagonal ribs (1.24) are symmetrically distributed on both sides of the main chord (1.1), balancing the forces on both sides of the main chord (1.1), greatly enhancing the torsional resistance of the tower transition section (1) of the wind turbine, and being able to reduce the structural deformation in the torsional direction. While the diagonal ribs (1.24) maximize the torsional resistance of the tower transition section (1) of the wind turbine, they also well control the material usage of the structure. Because the most easily associated (or "obvious") solution is to increase the wall thickness of the steel conical surface tile (1.2), although it can also achieve the effect of enhancing the torsional resistance, it increases too much material usage and has no economic viability at all.

[0046] The novelty and advantages of the above technical solution are as follows:

[0047] The tower transition section (1) of the wind turbine is different from the conventional solution. The top of the main chord (1.1) is directly butt-connected to the upper component (such as the bottom flange of the cylindrical tower (2) shown in this embodiment). At the same time, steel conical surface tiles (1.2) are arranged between two adjacent main chords (1.1). Through multiple steel conical surface tiles (1.2), the connection between the main chords (1.1) is completed, and the entire tower transition section (1) of the wind turbine forms a continuous curved surface, well continuing the geometric shape of the upper component (cylindrical tower) with a circular cross-section, and at the same time, using the continuous distribution of its materials to continue the form of continuous load transfer.

[0048] The diagonal ribs (1.24) of the steel conical surface tile (1.2) adopt the scheme of continuously extending from the concave surface (1.23) to the convex surface (1.22) (or from the convex surface (1.22) to the concave surface (1.23)). In this scheme where the main chord (1.1) and the steel conical surface tile (1.2) are connected, the torsional resistance of the tower transition section (1) of the wind turbine is greatly enhanced, and at the same time, the bending resistance of the tower transition section (1) of the wind turbine is also improved. And the addition of the diagonal ribs (1.24) does not increase too much material usage, well controlling the cost of the tower transition section (1) of the wind turbine.

[0049] From the upper part to the lower part of the transition section (1) of the wind turbine tower, there is a transition from continuous curved panel members to members, and also a transition with an increasing cross-section. The continuous extension of the structure avoids the stress concentration problem caused by sudden changes in stiffness and also ensures the bending and torsion resistance of the tower.

[0050] In the conventional technical solutions, the upper components (such as cylindrical towers), transition sections, and lattice towers all adopt different structural forms and then are simply mechanically connected. The solution proposed by the present invention ingeniously incorporates main chord members similar to those of lattice towers into the transition section, integrating the characteristics of the cylindrical tower (2) and the lattice tower (3) in advance, and naturally realizing the transition from continuous (cylindrical tower (2)) to discrete (lattice tower (3)), avoiding the risks brought by sudden structural changes (such as sudden changes in stiffness and structural stress concentration, etc.).

[0051] As Figure 8 shown, a flange section (1.25) is provided at the top of the steel conical surface tile (1.2). In order to dock with the upper connecting flange, the end faces (1.11) of the tops of all main chord members and the flange end faces (1.23) of all steel conical surface tiles are coplanar. In this embodiment, the flange section (1.25) at the top of the steel conical surface tile (1.2) is used to connect with the bottom flange of the cylindrical tower (2) of the wind turbine. In some other embodiments, it can also be connected with the circular flange of the wind turbine base or the yaw slewing bearing flange.

[0052] In this embodiment, as Figure 9 shown, after the flange section (1.25) at the top of the steel conical surface tile (1.2) is connected to the bottom flange of the cylindrical tower (2), an auxiliary flange section (1.5) is further provided below the flange section (1.25) of the steel conical surface tile. The auxiliary flange section (1.5) is simultaneously connected to the flange sections (1.25) of two adjacent steel conical surface tiles, which is used to strengthen the connection between the cylindrical tower and the transition section (1) of the wind turbine tower. Therefore, the connection sequence from top to bottom is the bottom flange of the cylindrical tower (2), the flange section (1.25) at the top of the steel conical surface tile (1.2), and the auxiliary flange section (1.5). Bolts pass through the above three components to complete the bolt connection.

[0053] The two sides (1.21) of the steel conical surface tile (1.2) are detachably or non-detachably connected to the main chord (1.1). That is to say, the connection between the main chord (1.1) and the steel conical surface tile (1.2) has the following possibilities: 1) One of the two sides (1.21) of the steel conical surface tile (1.2) is detachably connected to the main chord (1.1), such as by flange connection, while the other side (1.21) is non-detachably connected to the main chord (1.1), such as by welding; 2) Both sides (1.21) of the steel conical surface tile (1.2) are detachably connected to the main chord (1.1), such as by flange connection; 3) Both sides (1.21) of the steel conical surface tile (1.2) are non-detachably connected to the main chord (1.1), such as by welding. It should be noted that the above connection method between the steel conical surface tile (1.2) and the main chord (1.1) also applies to the connection method between the diagonal rib (1.24) and the main chord (1.1), because the diagonal rib (1.24) is part of the steel conical surface tile (1.2).

[0054] This embodiment only shows one of the possibilities. As Figure 10 shown, the two sides (1.21) of the steel conical surface tile (1.2) are provided with a first longitudinal flange (1.27), and the side (1.21) of the main chord (1.1) is provided with a second longitudinal flange (1.12). The connection through the first longitudinal flange (1.27) and the second longitudinal flange (1.12) makes the steel conical surface tile (1.2) and the adjacent two main chords (1.1) form a whole.

[0055] The convex surface (1.22) of each steel conical surface tile (1.2) is arranged towards the outside of the transition section (1) of the wind turbine tower, so that the main chord (1.1) and the steel conical surface tile (1.2) can finally enclose a continuous curved surface.

[0056] As shown in Figure 11, the diagonal ribs (1.24) provided on the concave surface (1.23) of the steel conical surface tile (1.2) are symmetric about the longitudinal bisecting position (1.26). As shown, the diagonal ribs (1.24) provided on the convex surface (1.22) of the steel conical surface tile (1.2) are symmetric about the longitudinal bisecting position (1.26). This symmetric arrangement well ensures the torsional resistance of the transition section (1) of the wind turbine tower in two directions.

[0057] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper, lower, front, rear, left and right" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0058] Unless otherwise clearly defined and limited in the present invention, the terms "installed, connected, connected" 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 can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tower transition section of a wind turbine unit, characterized in that it includes at least three main chord members (1.1) and at least three steel conical surface tiles (1.2); the steel conical surface tiles (1.2) connect two adjacent main chord members (1.1), and two side edges (1.21) of the steel conical surface tiles (1.2) are used to connect with the main chord members (1.1), and both sides of each main chord member are respectively connected with two steel conical surface tiles (1.2); a flange section (1.25) is provided at the top of the steel conical surface tile (1.2), and all the flange sections (1.25) together form a first connecting flange (1.3), which can be connected with the circular flange of the upper structure of the tower transition section (1) of the wind turbine unit; a second connecting flange (1.4) is provided at the bottom of the main chord member (1.1); the steel conical surface tile (1.2) is provided with a plurality of diagonal ribs (1.24), a first part (1.241) of each diagonal rib is arranged on the concave surface (1.23) of the steel conical surface tile (1.2), and a second part (1.242) of the diagonal rib is arranged on the convex surface (1.22) of the steel conical surface tile (1.2); the longitudinal bisecting position (1.26) of the steel conical surface tile (1.2) is located between two side edges (1.21) of the steel conical surface tile (1.2), and the steel conical surface tiles (1.2) on both sides of the longitudinal bisecting position (1.26) are symmetric about the longitudinal bisecting position (1.26); the first part (1.241) of the diagonal rib extends from the first side edge (1.21) of the steel conical surface tile (1.2) along the concave surface (1.23) of the steel conical surface tile (1.2) to the longitudinal bisecting position (1.26), and the second part (1.242) of the diagonal rib extends from the longitudinal bisecting position (1.26) along the convex surface (1.22) of the steel conical surface tile (1.2) to the second side edge (1.21) of the steel conical surface tile (1.2).

2. The transition section of a wind turbine tower according to claim 1, wherein The end faces (1.11) of the tops of all the main chord members and the top end faces of all the flange sections (1.25) are coplanar.

3. The transition section of a wind turbine tower according to claim 2, characterized in that, The flange section (1.25) is connected with the bottom flange of the cylindrical tower (2) of the wind turbine unit or the base circular flange or the yaw slewing bearing flange.

4. A tower transition section of a wind turbine unit according to claim 3, characterized in that, An auxiliary flange section (1.5) is further provided below the flange section (1.25) of the steel conical surface tile (1.2), and the auxiliary flange section (1.5) is simultaneously connected with two adjacent flange sections (1.25).

5. A tower transition section of a wind turbine unit according to claim 1, characterized in that, The connection between two side edges (1.21) of the steel conical surface tile (1.2) and the main chord member (1.1) is a detachable connection or a non-detachable connection.

6. A transition section of a wind turbine tower according to claim 1, characterized in that The convex surface (1.22) of each steel conical surface tile (1.2) faces the outside of the tower transition section of the wind turbine unit.

7. A tower transition section of a wind turbine unit according to claim 1, characterized in that The diagonal ribs (1.24) arranged on the concave surface (1.23) of the steel conical surface tile (1.2) are symmetric about the longitudinal bisecting position (1.26).

8. A tower adapter section of a wind turbine unit according to claim 1, characterized in that, The diagonal ribs (1.24) provided on the convex surface (1.22) of the steel conical surface tile (1.2) are symmetric about the longitudinal bisecting position (1.26).

9. A tower transition section of a wind turbine unit according to claim 1, characterized in that, The second connecting flange (1.4) is connected to the chord flange of the lattice tower (3) of the wind turbine.

10. A wind turbine unit, characterized in that, It includes a tower adapter section of a wind turbine according to any one of claims 1-9.

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