A prestressed assembled concrete frame support structure for a wind turbine

Abstract

The application discloses a wind turbine generator system prestress assembly type concrete frame support structure, which is provided with a steel tower to be fixed at the top end of the support structure, and a wind turbine generator is arranged at the top end of the steel tower; the support structure comprises a bottom layer support unit, which is a rectangular frame body structure; a middle layer support unit, which is arranged at the upper end of the bottom layer support unit and is composed of a plurality of standard structure units; a top layer support unit, which is arranged at the top end of the middle layer support unit; and a plurality of prestressed steel strands, each of which penetrates through holes arranged longitudinally on the bottom layer support unit, the middle layer support unit and the top layer support unit, and longitudinally connects and fixes the bottom layer support unit, the middle layer support unit and the top layer support unit. The support structure effectively avoids the problems of the node bolt and the inclined support in the traditional lattice type tower, which are under the disadvantageous stress.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a prestressed assembled concrete frame support structure for a wind turbine generator set. Background Art

[0002] The development of new renewable energy sources has become a major strategic imperative for the development of countries around the world. Wind power, a clean, efficient, and renewable energy source, can effectively address energy consumption issues. It has experienced rapid growth in recent years, with the grid-connected wind power capacity expanding in various countries. The increasing capacity of individual turbines and the height of supporting structures have led to an increase in the total weight of wind turbine towers, necessitating greater load-bearing capacity for the supporting structures.

[0003] Compared to the bending mode of a single member in a traditional tower, the axial force mode of the corner members of a lattice tower fully utilizes the advantages of concrete or steel tube concrete structures in high-rise structures, such as high bearing capacity and high lateral stiffness. In addition, the lattice columns are located at the corners of the cross section, far from the neutral axis, and the material strength utilization rate is high, which saves materials and improves stiffness. However, traditional lattice tower nodes use node plates and bolts for connection, and the entire tower has hundreds of bolts. For wind turbine towers that are subjected to long-term fatigue reciprocating loads, the fatigue relaxation problem is extremely prominent, which can easily cause the bolts to loosen and then cause the tower to collapse. Moreover, the excessive number of bolts greatly increases the difficulty and workload of installation, making it difficult to quickly assemble. In addition, the diagonal braces in the lattice tower are connected to the main rods at both ends by bolts, which puts them in an unfavorable stress state and makes them prone to damage. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a prestressed assembled concrete frame support structure for a wind turbine, which effectively avoids the problem of unfavorable stress on node bolts and diagonal braces existing in traditional lattice towers.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A prestressed assembled concrete frame support structure for a wind turbine, wherein a steel tower to be fixed is arranged at the top of the support structure, and a wind turbine is installed at the top of the steel tower. The support structure comprises: a bottom support unit, which is a rectangular frame structure; a middle support unit, which is arranged at the upper end of the bottom support unit, and the middle support unit is composed of a plurality of overlapping standard structural units; a top support unit, which is arranged at the top of the middle support unit; and a plurality of prestressed steel strands, each prestressed steel strand respectively passing through a hole longitudinally arranged in the bottom support unit, the middle support unit and the top support unit, to complete the longitudinal connection and fixation of the bottom support unit, the middle support unit and the top support unit.

[0007] According to a preferred embodiment, the bottom layer support unit comprises: a prefabricated bottom layer corner column frame arranged at each of the four corners of the rectangular structure; and a prefabricated bottom layer middle column frame arranged between two adjacent prefabricated bottom layer corner column frames.

[0008] According to a preferred embodiment, the prefabricated bottom layer middle column frame comprises a longitudinally arranged bottom layer middle column and two laterally arranged bottom layer middle column crossbeams arranged on both sides of the bottom layer middle column; the prefabricated bottom layer corner column frame comprises a longitudinally arranged bottom layer corner column and two laterally arranged bottom layer corner column crossbeams connected to the bottom layer corner column; and the bottom layer middle column and the bottom layer corner column are provided with through holes for passing prestressed steel strands.

[0009] According to a preferred embodiment, the end portions of the bottom layer middle column crossbeams and the bottom layer corner column crossbeams are provided with matching notched portions, and the bottom layer middle column crossbeams and the bottom layer corner column crossbeams are connected to each other via epoxy resin coated on the notched portions of the crossbeams.

[0010] According to a preferred embodiment, the standard structure unit comprises: a prefabricated middle layer corner column frame arranged at each of the four corners of the rectangular structure; and a prefabricated middle layer middle column frame arranged between two adjacent prefabricated bottom layer corner column frames.

[0011] According to a preferred embodiment, the prefabricated middle layer middle column frame comprises a longitudinally arranged middle layer middle column and two laterally arranged middle layer middle column crossbeams arranged on both sides of the middle layer middle column; the prefabricated middle layer corner column frame comprises a longitudinally arranged middle layer corner column and two laterally arranged middle layer corner column crossbeams connected to the middle layer corner column; and the middle layer middle column and the middle layer corner column are provided with through holes for passing prestressed steel strands.

[0012] According to a preferred embodiment, the end portions of the middle layer middle column crossbeams and the middle layer corner column crossbeams are provided with matching notched portions, and the middle layer middle column crossbeams and the middle layer corner column crossbeams are connected to each other via epoxy resin coated on the notched portions of the crossbeams.

[0013] According to a preferred embodiment, the top layer support unit is composed of prefabricated adapter segment frames; the prefabricated adapter segment frames comprise adapter segment crossbeams, adapter segment longitudinal columns, and connecting plates, each adapter segment longitudinal column is connected to each other via an adapter segment crossbeam to form a rectangular frame body, and the connecting plates are arranged on the inner side of the rectangular frame body and are fixedly connected to each adapter segment longitudinal column via an adapter segment crossbeam.

[0014] According to a preferred embodiment, the axis of the longitudinal column of the transition section is further provided with a through hole for passing the prestressed steel strand.

[0015] According to a preferred embodiment, the height of the top-level support unit is lower than the height of the standard structural unit.

[0016] The aforementioned main solution of the present invention and its further options can be freely combined to form multiple solutions, all of which are solutions that can be adopted and protected by the present invention; and the (non-conflicting options) of the present invention can also be freely combined with each other and with other options. After understanding the solutions of the present invention, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by the present invention, and these are not exhaustive here.

[0017] Beneficial effects of the present invention:

[0018] (1) The present invention can effectively enhance the overall safety of the tower. Traditional lattice tower nodes use node plate-bolt connections. For wind turbine towers that are under fatigue reciprocating loads for a long time, too many bolts will make fatigue relaxation problems extremely prominent. Bolts are easy to loosen under fatigue loads, which will then cause the tower to collapse. In addition, both ends of the diagonal braces in the lattice tower are connected to the main rod by bolts. The stress on them is in an unfavorable state and is prone to damage. The present invention adopts a frame structure, eliminates the connection between the diagonal braces and node bolts of the traditional lattice tower, increases the number of longitudinal columns in the transition section, and directly transmits force through the longitudinal columns in the transition section. The force transmission path is simple and clear, effectively avoiding the problems of node bolt fatigue and unfavorable stress on the diagonal braces in the traditional lattice tower.

[0019] (2) The present invention adopts a fully dry connection method using prestressed steel strands to tension prefabricated components, which greatly improves the efficiency of on-site assembly. Although traditional lattice tower components are also prefabricated in factories, the excessive number of node bolt connections increases the difficulty and workload of on-site installation, which is not conducive to rapid assembly. The present invention uses prestressed steel strands to tension the prefabricated components. Except for tensioning the prestressed steel strands and applying epoxy resin, no additional installation work is required on-site, and the assembly efficiency is greatly improved.

[0020] (3) The present invention avoids bolted connections at the nodes, reducing the requirements for machining accuracy. Conventional dry-type connections of lattice towers typically require strict control of the screw hole accuracy of the main rods, diagonal braces, and node plates; otherwise, on-site bolt installation becomes difficult. The present invention eliminates all bolted connections and only requires prestressed steel strands to be tensioned and epoxy resin applied to connect the prefabricated components, significantly reducing the requirements for component machining accuracy.

[0021] (4) The present invention is easy to manufacture and simple to install on site, making it suitable for industrial production and manufacturing. Unlike other supporting structures for wind turbines, all components of the present invention do not involve complex processing and installation processes. After the components are prefabricated, they can be directly hoisted on site, facilitating mass production, manufacturing, and installation, thereby effectively reducing production costs and construction time, and achieving good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional structural diagram of a prestressed assembled concrete frame support structure for a wind turbine generator system according to an embodiment of the present invention;

[0023] Figure 2 is a three-dimensional structural diagram of a single-layer standard structural unit in an embodiment of the present invention;

[0024] Figure 3 3D structural diagram of the prefabricated middle column frame in the embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the prefabricated middle corner column frame in an embodiment of the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of a prefabricated transition section frame in an embodiment of the present invention;

[0027] Figure 6 is a three-dimensional structural diagram of the bottom support unit in an embodiment of the present invention;

[0028] Among them, 1-prefabricated middle column frame, 11-middle column cross beam, 111-middle column cross beam semi-cylindrical part, 12-middle longitudinal column, 121-middle longitudinal prestressed duct, 2-prefabricated middle corner column frame, 21-middle corner column cross beam, 211-middle corner column cross beam semi-cylindrical part, 22-middle corner column, 3-prefabricated bottom column frame, 31-bottom column cross beam, 32-bottom column, 4-prefabricated bottom Corner column frame, 41-bottom floor corner column crossbeam, 42-bottom floor corner column, 5-prefabricated transition section frame, 51-transition section crossbeam, 52-transition section longitudinal column, 53-connecting plate, 521-transition section longitudinal prestressed duct, 6-staggered joints, 61-middle joint, 62-edge joint, 63-epoxy resin, 64-rubber product, 7-longitudinal connection node, 8-prestressed steel strand, 9-upper steel tower, 10-wind turbine. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0030] It should be noted that in order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or relationships typically used when the product of the invention is in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0034] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] In addition, the present invention would like to point out that, in the present invention, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present invention are all known to those skilled in the art based on the existing technology without creative work.

[0036] Example 1:

[0037] refer to Figures 1 to 6 As shown, this embodiment discloses a prestressed assembled concrete frame support structure for a wind turbine. A steel tower 9 to be fixed is provided at the top of the support structure, and a wind turbine 10 is installed at the top of the steel tower 9.

[0038] Preferably, the support structure includes: a bottom support unit, a middle support unit, a top support unit and a plurality of prestressed steel strands 8 .

[0039] Among them, the bottom support unit is a rectangular frame structure; the middle support unit is arranged at the upper end of the bottom support unit, and the middle support unit is composed of several overlapping standard structural units; the top support unit is arranged at the top of the middle support unit; each prestressed steel strand passes through the holes longitudinally arranged in the bottom support unit, the middle support unit and the top support unit, thereby completing the longitudinal connection and fixation of the bottom support unit, the middle support unit and the top support unit.

[0040] In this embodiment, the support structure has eight layers, including six layers of standard structural units, one layer of bottom-level support units, and one layer of top-level support units. The top-level support units are composed of prefabricated transition section frames 5. Each layer of standard structural units includes four prefabricated middle column frames 1 and four prefabricated middle corner column frames 2. The bottom-level support units include four prefabricated bottom-level center column frames 3 and four prefabricated bottom-level corner column frames 4, with an overall square cross-section.

[0041] Specifically, the prefabricated middle layer center column frame 1 and the prefabricated middle layer corner column frame 2 are directly prefabricated in a factory.

[0042] In this embodiment, the prefabricated middle column frame 1 includes a longitudinally arranged middle column 12 and two transversely arranged middle column beams 11. The two middle column beams 11 are respectively arranged on both sides of the middle column 12, and the angle between the two middle column beams 11 is 180°. The prefabricated middle corner column frame 2 includes a longitudinally arranged middle corner column 22 and two transversely arranged middle corner column beams 21. The two middle corner column beams 21 are respectively connected to the middle corner column 22, and the angle between the two middle corner column beams 21 is 90°. The axis of the middle column 12 and the middle corner column 22 is reserved with a longitudinal prestressed channel 121 that runs through the cross section for passing the prestressed steel strands 8.

[0043] The ends of the middle layer center column beam 11 and the middle layer corner column beam 21 are provided with matching notches, and the middle layer center column beam 11 and the middle layer corner column beam 21 are connected to each other through epoxy resin 63 coated on the notches of the two beams.

[0044] During on-site installation, the prefabricated middle column frame 1 and the prefabricated middle corner column frame 2 are sequentially connected in the horizontal direction via the staggered joints 6 formed by the semi-cylindrical portions 111 of the middle column cross beams and the semi-cylindrical portions 211 of the middle corner column cross beams at the ends of the cross beams. The semi-cylindrical portions 111 of the middle column cross beams and the semi-cylindrical portions 211 of the middle corner column cross beams at the ends of the two cross beams also serve as the notches corresponding to the two cross beams.

[0045] The staggered joint 6 is formed by the staggered connection of the two middle-layer center column beams 11 and the middle-layer corner column beams 21, where the middle-layer center column beam semi-cylindrical parts 111 and the middle-layer corner column beam semi-cylindrical parts 211 at the ends are spliced ​​into cylinders, including the middle joint 61 between the axial surfaces of the middle-layer center column beam semi-cylindrical parts 111 and the middle-layer corner column beam semi-cylindrical parts 211 at the ends, and the edge joint 62 between the end surfaces of the middle-layer center column beam semi-cylindrical parts 111 and the middle-layer corner column beam semi-cylindrical parts 211.

[0046] Specifically, epoxy resin 63 is applied to the central joint 61 to bond the beams together, connecting the prefabricated middle column frame 1 with the prefabricated middle corner column frame 2 to form a standard structural unit, or connecting the prefabricated bottom column frame 3 with the prefabricated bottom corner column frame 4 to form the aforementioned bottom support unit. If machining precision errors exist at the cross-beam joints between the bottom and middle support units, preventing direct connection, rubber products 64 can be placed at the edge joints 62 to fill the gaps.

[0047] In this embodiment, the prefabricated transition section frame 5 is composed of sixteen transition section cross beams 51, eight transition section longitudinal columns 52, and a connecting plate 53. Eight of the cross beams are used to connect the longitudinal columns 52, and the other eight cross beams are used to support the connecting plate 53. The transition section longitudinal columns 52 are also provided with longitudinal prestressed channels 521 for passing prestressed steel strands 8. These components are precast and cast in one piece in a factory to form the prefabricated transition section frame 5. In particular, in this embodiment, to reduce the weight of the prefabricated transition section frame 5, the height of the transition section longitudinal columns 52 is set to half the height of a standard structural unit.

[0048] Furthermore, in this embodiment, to compensate for the reduced height of the prefabricated transition section frame 5, the height of the bottom-level center columns 32 and bottom-level corner columns 42 of the bottom-level support unit is set to 1.5 times the height of the other standard structural units. Aside from the height difference, the bottom-level support unit's structure and production method are identical to those of the other standard structural units, consisting of a prefabricated bottom-level center column frame 3 and prefabricated bottom-level corner column frame 4, connected using staggered joints 6.

[0049] Similarly, the prefabricated ground floor center column frame 3 includes a longitudinally arranged ground floor center column 32 and two transversely arranged ground floor center column crossbeams 31. The two crossbeams 31 are positioned on either side of the ground floor center column 32, with the included angle between them being 180°. The prefabricated ground floor corner column frame 4 includes longitudinally arranged ground floor corner columns 42 and two transversely arranged crossbeams 41. The two crossbeams 41 are connected to each of the ground floor corner columns 42, with the included angle between them being 90°. Through holes for passing prestressed steel strands 8 are provided at the axes of the ground floor center columns 32 and ground floor corner columns 42.

[0050] The ends of the bottom center column beam 31 and the bottom corner column beam 41 are provided with matching notches, and the bottom center column beam 31 and the bottom corner column beam 41 are connected to each other through epoxy resin 63 coated on the notches of the two beams.

[0051] After the horizontal connections of the structural units are complete, they are hoisted sequentially along the height scale, and the prefabricated transition section frame 5 is placed atop all standard structural units. The prestressed steel strands 8 are placed within the longitudinal prestressing channels 121 and tensioned and anchored atop the longitudinal transition section columns 52 of the prefabricated transition section frame 5, connecting the structural units and the prefabricated transition section frame 5 to form a complete framework. If machining precision errors exist at the longitudinal connection nodes 7, preventing direct connection, on-site polishing or an appropriate application of epoxy resin can be used to adjust the levelness.

[0052] The present invention can effectively enhance the safety of the wind turbine support structure and improve its assembly efficiency.

[0053] Specifically, this invention, based on the basic structure of a traditional lattice tower, eliminates the diagonal bracing and node bolt connections typically found in lattice towers. Instead, it utilizes a frame design with an increased number of longitudinal columns, resulting in direct and clear force transmission. This retains the advantages of the traditional lattice tower's rod-based load-bearing model while effectively avoiding the fatigue and relaxation of node bolts and unfavorable diagonal bracing loads often found in traditional lattice towers. The number and arrangement of longitudinal columns and beams in the frame directly impact the load-bearing capacity of this invention. During implementation, those skilled in the art can modify the specific frame layout based on load-bearing performance and economic requirements.

[0054] In addition, all the components of the present application do not involve complex processing and installation process, and the cancellation of the node bolt makes the installation process of the present application only need to hoist and directly tension the prestressed steel strand to assemble each prefabricated component to form an overall support structure, greatly improves the assembly efficiency, is convenient for batch manufacturing and installation, thereby effectively reduces the production cost and construction time, has good economic benefits, and is beneficial to popularization.

[0055] The foregoing basic examples and each further selected example of the present application can be freely combined to form a plurality of embodiments, all of which are embodiments that can be adopted and claimed by the present application. In the present application scheme, each selected example can be arbitrarily combined with any basic example and selected example. Those skilled in the art can know numerous combinations.

[0056] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A prestressed assembled concrete frame support structure for a wind turbine generator set, wherein a steel tower (9) to be fixed is provided at the top of the support structure, and a wind turbine generator set (10) is installed at the top of the steel tower (9), characterized in that: The support structure comprises: A bottom support unit, wherein the bottom support unit is a rectangular frame structure; A middle-level support unit, which is arranged on the upper end of the bottom-level support unit and is composed of a plurality of overlapping standard structural units; A top layer support unit, the top layer support unit being arranged on the top of the middle layer support unit; The bottom support unit, the middle support unit and the top support unit are all concrete structures; If prestressed steel strands are provided, each prestressed steel strand passes through the holes longitudinally arranged in the bottom support unit, the middle support unit and the top support unit, thereby completing the longitudinal connection and fixation of the bottom support unit, the middle support unit and the top support unit; The bottom support unit comprises: a prefabricated bottom corner column frame (4), wherein the prefabricated bottom corner column frame (4) is respectively arranged at the four top corners of the rectangular structure; A prefabricated bottom floor center column frame (3), wherein the prefabricated bottom floor center column frame (3) is arranged between two adjacent prefabricated bottom floor corner column frames (4); The prefabricated bottom center column frame (3) comprises a bottom center column (32) arranged longitudinally and two bottom center column cross beams (31) arranged transversely, wherein the two bottom center column cross beams (31) are respectively arranged on both sides of the bottom center column (32); The prefabricated bottom corner column frame (4) comprises a bottom corner column (42) arranged longitudinally and two bottom corner column cross beams (41) arranged transversely, wherein the two bottom corner column cross beams (41) are respectively connected to the bottom corner columns (42); The axes of the bottom-level center columns (32) and the bottom-level corner columns (42) are provided with through holes for passing the prestressed steel strands (8); The ends of the bottom center column beam (31) and the bottom corner column beam (41) are provided with mutually matching notches, and the bottom center column beam (31) and the bottom corner column beam (41) are connected to each other via epoxy resin (63) coated on the notches of the two beams; The standard structural unit comprises: a prefabricated middle layer corner column frame (2), wherein the prefabricated middle layer corner column frame (2) is respectively arranged at the four top corners of the rectangular structure; A prefabricated middle layer center column frame (1), wherein the middle layer center column frame (1) is arranged between two adjacent prefabricated bottom layer corner column frames (4); The prefabricated middle column frame (1) comprises a middle column (12) arranged longitudinally and two middle column cross beams (11) arranged transversely, wherein the two middle column cross beams (11) are respectively arranged on both sides of the middle column (12); The prefabricated middle corner column frame (2) comprises a middle corner column (22) arranged longitudinally and two middle corner column cross beams (21) arranged transversely, wherein the two middle corner column cross beams (21) are respectively connected to the middle corner columns (22); The axis of the middle layer center column (12) and the middle layer corner column (22) is provided with a through hole for passing the prestressed steel strand (8); The ends of the middle layer center column beam (11) and the middle layer corner column beam (21) are provided with mutually matching notches, and the middle layer center column beam (11) and the middle layer corner column beam (21) are connected to each other via epoxy resin (63) coated on the notches of the two beams; The ends of the middle layer center column beam (11) and the middle layer corner column beam (21) are provided with mutually matching notches, and the middle layer center column beam (11) and the middle layer corner column beam (21) are connected to each other via epoxy resin (63) coated on the notches of the two beams; The top support unit is composed of a prefabricated transition section frame (5); The prefabricated transition section frame (5) comprises a transition section crossbeam (51), a transition section longitudinal column (52) and a connecting plate (53); the transition section longitudinal columns (52) are connected to each other via the transition section crossbeam (51) to form a rectangular frame; the connecting plate (53) is arranged inside the rectangular frame and is fixedly connected to each transition section longitudinal column (52) via the transition section crossbeam (51).

2. The prestressed assembled concrete frame support structure for a wind turbine generator set according to claim 1, characterized in that: The axis of the transition section longitudinal column (52) is also provided with a through hole for passing the prestressed steel strand (8).

3. The prestressed assembled concrete frame support structure for a wind turbine generator set according to claim 1, wherein: The height of the top-level support unit is lower than that of the standard structural unit.

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