Wind turbine with nacelle having a center of gravity offset

Abstract

A wind turbine comprises a tower, a nacelle mounted on the tower, and a rotor defining a rotor axis extending along a vertical center plane, and the wind turbine is configured for harvesting wind energy by rotating blades around the rotor axis in a rotor rotation direction. The nacelle comprises a rotor-support assembly forming a load path from the rotor to the tower and configured for receiving a rotor torque due to rotation of the rotor. In order to reduce the load on the tower and potentially provide a cheaper construction, a center of gravity of the nacelle is offset from the center plane in a direction relative to the rotor rotation direction to counteract the rotor torque.

Description

Technical Field

[0001] This disclosure relates to a wind turbine comprising a tower, a nacelle mounted on the tower, and a rotor, the wind turbine being used to harvest wind energy by rotating the rotor about a rotor axis. The nacelle includes: a rotor-supporting assembly that forms a load path from the rotor to the tower; and a main bearing that is attached to the rotor-supporting assembly and supports rotation of the rotor relative to the rotor-supporting assembly. Background Technology

[0002] Wind turbines have increased in size, both in terms of nominal power output and the physical dimensions of individual components. Consequently, the size of the nacelle must also increase to accommodate the required wind turbine components. Wind turbines are normally transported from one or more manufacturing locations of individual components to the operating site where the wind turbine is installed, via road, rail, or ship, or a combination thereof.

[0003] The increased size leads to increased loads that must be accommodated at multiple locations within the wind turbine. Within the nacelle, the problem of torque-based loads (i.e., the reaction loads generated by the rotor when power is applied in the powertrain) must be addressed. Significant reaction torques are applied from the powertrain (particularly from the gearbox). In many designs, the torque applied from the drivetrain is transferred to the frame supporting the gearbox via torque arms. Typically, such forces are channeled into the main frame, where they are experienced as asymmetrical loads. Therefore, the construction and dimensions of the rotor-support assembly must accommodate these torques. Summary of the Invention

[0004] The objective of embodiments of this disclosure is to reduce loads, particularly the reaction loads generated by the rotor when energy is applied in the drivetrain. Specifically, the objective of this disclosure is to reduce such asymmetrical loads on the tower of a wind turbine, and thus potentially reduce the weight, size, and cost of the wind turbine (and particularly its tower section). This could potentially reduce transportation and handling costs without limiting the possible size of the wind turbine. Another objective of this disclosure is to provide a good balance between weight distribution and modularity.

[0005] For these and other purposes, this disclosure provides, in a first aspect, a wind turbine including a tower, a nacelle mounted on the tower, and a rotor defining a rotor axis extending along a vertical central plane, and the wind turbine is configured to harvest wind energy by rotating blades about the rotor axis in the direction of rotor rotation.

[0006] The nacelle includes a rotor-support assembly, which includes a main frame that forms a load path from the rotor to the tower and receives a certain amount of torque caused by the rotation of the rotor.

[0007] The center of gravity (COG) of the nacelle is offset from the central plane in a direction relative to the direction of rotor rotation in order to counteract the torque caused by the rotation of the rotor.

[0008] Because the COG is offset, it counteracts the rotor torque, thereby reducing the load caused by this asymmetrical torque on the tower, and the tower and the tower joint between the tower and the nacelle (including the yaw assembly for yawing the nacelle) can optionally be smaller and cheaper.

[0009] The clockwise rotation of the rotor can be considered when viewing the rotor from the wind side. In this case, the COG should be shifted to the left of the center plane.

[0010] If the rotor rotates counterclockwise (which is uncommon for wind turbines), the COG should be moved to the right side of the center plane.

[0011] The nacelle can be directly supported by the tower or indirectly supported by the tower via an intermediate tower structure. If the wind turbine is of the conventional horizontal axis type, the nacelle is typically supported by a yaw device between the top of the tower and the nacelle. However, this disclosure may also relate to multi-rotor wind turbines in which more than one nacelle is supported by a beam structure, which in turn is supported by the tower, for example, via a yaw device between the tower and the beam structure.

[0012] This disclosure may relate to upwind or downwind turbines.

[0013] Wind turbines can be direct-drive wind turbines, in which the generator is typically placed outside the nacelle, or the generator can be located in the main unit. The main unit supports the rotor via a rotor shaft.

[0014] The nacelle includes a rotor-support assembly that forms a load path from the rotor to the tower, for example via the intermediate tower structure and, for example, via the yaw device. The rotor-support assembly includes a main frame that is, for example, in the form of a cast assembly, such as a single-unit component.

[0015] The engine room may also include various components for power generation, hydraulic control, and computers, etc.

[0016] In addition to the main frame, the rotor-support assembly may also include the bearing structure and other components that support the rotor in the wind turbine.

[0017] In promoting the modular development of wind turbines, the nacelle may include: a main unit comprising a rotor-support assembly; and a first auxiliary unit attached to the main unit and housing operating components for power conversion. With this arrangement, the advantage of assembly is that the units can be manufactured in a facility remote from the location where the wind turbine is installed, and the units, being only a subset of the entire nacelle, can be transported more efficiently due to their smaller size and weight. At the location where the wind turbine is installed, these units can be assembled on the ground adjacent to the tower or on the tower itself.

[0018] The operating components may include a first transformer and a first converter, and the distance from the first converter to the central plane may be greater than the distance from the first transformer to the central plane.

[0019] The wind turbine may include a second auxiliary unit, which is configured such that the first auxiliary unit and the second auxiliary unit are located on opposite sides of the central plane.

[0020] Compared to conventional designs, providing a primary operating component with significant weight within the auxiliary unit offers the opportunity for a significant shift in the resultant center of gravity (COG) by counteracting the reaction torque. The second auxiliary unit may include operating components for power conversion, and the operating components of the first and second auxiliary units may be asymmetrically arranged about the central plane to provide offset of the COG from the central plane.

[0021] The second auxiliary unit may include a second transformer and a second converter, and the distance from the first converter to the central plane may be greater than the distance from the second converter to the central plane. The converter thereby facilitates the displacement of the COG from the central plane.

[0022] The nacelle can be rotatably connected to the tower of the wind turbine to rotate about a yaw axis extending along a vertical transverse plane perpendicular to the vertical center plane. In this embodiment, the transverse plane can be located between the COG and the rotor, i.e., the COG is behind the vertical yaw axis when viewed in the direction of the wind.

[0023] The first operating component (particularly the transformer) in the operating assembly for power conversion can be attached to the rotor-support assembly such that the first center of gravity of the first operating component (referred to herein as the first COG) is headwind relative to the COG. Headwind refers to the direction of the wind when the rotor is positioned in an operating position facing the wind.

[0024] The second operating component (particularly the converter) in the operating assembly for power conversion can be attached to the rotor-support assembly such that the second center of gravity of the second operating component (referred to herein as the second COG) is downwind relative to the COG. Downwind means that when the rotor is positioned in an operating position facing the wind, it is in a direction away from the wind.

[0025] The rotor-support assembly may include a main frame and a main bearing housing attached to the main frame, the main bearing housing including a main bearing for rotational suspension of the rotor shaft relative to the main frame.

[0026] The main bearing housing can form part of the load path from the nacelle (particularly from the first operating component in the operating assembly) to the tower.

[0027] Displacement of the COG away from the center plane can be caused by load components (e.g., first operating components for power conversion that are directly attached to the rotor-support assembly (e.g., directly attached to the main frame).

[0028] Displacement of the COG away from the center plane can be caused by load components (e.g., a second operating component for power conversion, which is indirectly attached to the rotor-support assembly via an auxiliary unit to the main frame and the main unit).

[0029] Examples of main and / or auxiliary units include units of any size and shape that are configured to be assembled.

[0030] Auxiliary units and / or main units can be sized and / or shaped to be comparable to or equal to the size and shape of freight containers. Therefore, each unit inherits the advantages of freight containers in loading, unloading, transportation, and storage. Freight containers can be loaded and unloaded anywhere in the world by ship, train, and truck, and are less expensive than bulk shipping.

[0031] Cost savings are even more pronounced when the main unit and / or auxiliary unit are freight containers. Freight containers, also known as intermodal containers, standard freight containers, box containers, ocean freight containers, or ISO containers, generally refer to containers used in global containerized multimodal transport systems to store and move materials and products for intercontinental transport. Freight containers can conform to the dimensions and structural specifications for Series 1 freight containers in the ISO standard ISO 668:2013.

[0032] The main unit and auxiliary units can be arranged side by side, such that the auxiliary units are separated by a central plane in a direction away from the axis of rotation defined by the rotor-support assembly, rather than one after another in the direction of the axis of rotation.

[0033] Each of the two auxiliary units may have half the size of a freight container in accordance with the dimensions and structural specifications for Series 1 freight containers in the ISO standard ISO 668:2013, and may be configured such that the two halves of the container can be assembled to form a container during transport, and may be divided into two auxiliary units so as to be arranged on opposite sides of, for example, the main unit. The container may be separated, particularly at a joint extending along the longitudinal direction of the container (i.e., the longest dimension of the container). Attached Figure Description

[0034] In the following description, various embodiments are illustrated with reference to the accompanying drawings, wherein:

[0035] Figure 1a , Figure 1b ,as well as Figure 1c An example is a wind turbine with its nacelle mounted on a tower;

[0036] Figure 2 An example of an engine room including a main unit and two auxiliary units is shown;

[0037] Figure 3 An example of a perspective view of the aircraft cabin is shown;

[0038] Figure 4 This illustrates a portion of the rotor-support assembly, namely, the main frame formed as a single cast assembly;

[0039] Figure 5 An example is shown of the rotor-support assembly as seen from one end of the rotor shaft;

[0040] Figures 6 to 7 Different implementations of the cabin as seen from above are illustrated;

[0041] Figure 8 Details related to the center of gravity of different components are illustrated;

[0042] Figure 9a , Figure 9b ,as well as Figure 10 The different joints between the operating components and the main frame are illustrated;

[0043] Figure 11 This example illustrates that the main unit and auxiliary unit are separate units, and

[0044] Figures 12 to 15 Different joints between the main unit and the auxiliary unit are illustrated. Detailed Implementation

[0045] Since various changes and modifications within the spirit and scope of this disclosure will be apparent to those skilled in the art based on this detailed description, detailed descriptions and specific examples are given only by way of illustration when indicating implementation methods.

[0046] Figure 1a and Figure 1b An example is shown of a wind turbine 1 having a nacelle 2 mounted on a tower 3. A hub 4 carrying three rotor blades 5 forms the rotor and is supported by a rotor-support assembly in the nacelle 2. Typically, the rotor-support assembly includes a rotor shaft that connects a gear assembly and a generator to the hub. However, gears are not always necessary because the generator can be directly driven by the shaft. Figure 1b An example is a direct-drive wind turbine with a generator 6 located outside the nacelle. The rotor-support assembly also includes a main frame and a main bearing housed in a main bearing housing connected to the main frame.

[0047] As the rotor rotates, energy is dissipated in the drivetrain, primarily as losses in the bearings and optional gearbox, and as energy transmitted to the generator for conversion into electrical energy. In response to the dissipated energy, the rotor-support assembly must counteract the torque generated by the rotor applying power to the drivetrain. This reaction torque is experienced as a load directed from the rotor-support assembly into the tower.

[0048] According to the definition herein, the rotor rotates about rotor axis 7. The vertical center plane 8, which longitudinally bisects the wind nacelle 2, can be defined by the rotor axis extending in this plane. To guide the rotor towards the wind, the nacelle 2 can rotate about a vertical yaw axis 9. A laterally extending transverse plane 10 can be defined, within which the yaw axis extends. The transverse plane 10 is perpendicular to the center plane. The yaw axis 9 extends in both the transverse plane 10 and the center plane 8.

[0049] Figure 1c The center plane and transverse plane of the cabin are illustrated when viewed from above. The tower is indicated by circle 11 and has radial dimensions indicated by arrow 12.

[0050] Figure 2 An example of a nacelle with a modular construction is shown, in which certain operating components are housed within individual modules. More specifically, the nacelle includes a main unit 20 and two auxiliary units 21, 22. The auxiliary units can be assembled, transported, and mounted on the main unit separately. A cooling zone 23 is located on the top of the nacelle. The cooling zone is formed by a heat exchanger, which can be part of either the main unit or the auxiliary unit. The main unit 20 is mounted on a tower 3 via a rotor-support assembly and a yaw assembly (not shown). The yaw assembly allows the nacelle 2 to rotate about a yaw axis to direct the rotor into the wind.

[0051] Figure 3 Examples Figure 2 A perspective view of cabin 2. Figure 3 In this configuration, the outer wall of the nacelle 2 (for illustrative purposes) is transparent, thus revealing the interior of the nacelle 2 and the wind turbine components housed therein. The main unit 20 houses the rotor-support assembly that supports the rotor. The rotor-support assembly specifically includes a main frame and a main bearing 31 attached to the main frame to facilitate the rotation of the rotor.

[0052] The disclosed wind turbine also includes a gear assembly 32 and a generator 33, which are sequentially arranged after the hub 4 along a direction defined by the rotor's axis of rotation. The components in the main unit primarily form part of the drivetrain. In an alternative embodiment, the generator is located outside the nacelle, such as... Figure 1b exemplified.

[0053] Auxiliary unit 22 houses the main components that form part of the power conversion system, more specifically the converter unit 34 and the transformer unit 35. In an alternative embodiment, auxiliary unit 22 houses, for example, a stack of electrolytic cells or a battery. Another auxiliary unit 21 is attached to the main unit on the opposite side of the central plane and may contain similar operating components or other components (e.g., a crane). Hereinafter, such components are referred to as operating components.

[0054] The operating components are selected and positioned such that the center of gravity (COG) of the entire nacelle is offset from the central plane in a direction relative to the rotor rotation direction, in order to counteract and optionally eliminate the received torque.

[0055] Figure 4 An example is shown: a main frame 40 formed as a single cast assembly. The main frame also includes an assembly structure 41 directly bolted to the cast assembly. The rotor-support assembly forms part of the nacelle and defines the load path from the rotor to the tower 3. Figures 1a to 1c and Figure 2 In this implementation, the rotor-support assembly is typically located in the main unit 20.

[0056] Figure 5 This illustration shows the rotor-support assembly as seen from the rear of the nacelle towards the rotor facing upwind. The main bearing housing 50 is attached to the main frame 40. The main bearing allows the rotor to rotate relative to the main frame. Arrow 51 indicates the torque experienced by the rotor-support assembly.

[0057] Figure 5The load assembly 52 is schematically shown mounted on the assembly structure 41, which is used to shift the center of gravity (COG) of the nacelle from the central plane 8, as illustrated by arrow 53. The COG, not in the central plane, counteracts the torque 51 experienced due to the rotation of the rotor. The counteracting torque provided by the shifted COG is illustrated by arrow 54. As discussed below, the load assembly is a major operating component with significant weight, such as a transformer. In the latest generation of designs with current 10MW to 15MW ratings, transformers weigh several tons, even up to 20 tons, so their positioning has a significant impact on the position of the COG.

[0058] When the main bearing housing is attached to the main frame, it forms part of the load path from the load assembly 52 to the nacelle and to the tower.

[0059] Figure 6 The nacelle 2 is shown as viewed from above. The main unit 20 contains the rotor-support assembly, and the auxiliary units 21 and 22 each contain a converter 34 and a transformer 35.

[0060] The main frame 40 includes a pair of assembly structures 41, 42 located on opposite sides of the main frame 40. In this example, an operating component in the form of a transformer 35 is directly attached to the main frame. The main frame is secured to the tower via a yaw assembly that allows rotation about a yaw axis. The main frame thus defines a load path extending directly from the operating component 35 through the main frame to the tower.

[0061] Other operating components 34 are indirectly attached to the rotor-support assembly via an auxiliary unit. A second operating component is attached, for example, to the base plate or wall of the auxiliary unit, and the auxiliary unit is attached to the main unit. The auxiliary unit and the main unit thus define the load path from the second operating component through the auxiliary unit to the rotor-support assembly and to the tower.

[0062] Figure 6 The example shows that the operating component 35 (in this case, transformer 35) is located at the same distance from the central plane 8, while the second operating component (in this case, converter 34) is located at a different distance from the central plane. This provides a way to shift the COG from the central plane 8 and thereby counteract the torque experienced.

[0063] Optimal offsetting can be achieved through different combinations of positions. Transformers are typically heavier than converters (although converters also have a significant weight of several tons, even up to 15 tons), and a slight displacement of transformer 35 can have a greater impact than a considerably large displacement of converter 34.

[0064] Figure 7Another example is illustrated in which only one auxiliary unit is placed on one side of the central plane 8, so that the entire mass of the auxiliary unit causes the COG of the cabin to be significantly displaced from the central plane and counteracts the torque experienced.

[0065] Figure 8 Examples are given with Figure 4 The nacelle is a monolithically cast main frame. A first operating assembly 35 is directly attached to the rotor-support assembly, and the center of gravity of the first operating assembly is marked as a first COG. This first COG is positioned close to the transverse plane 10. Displacement of the COG away from the central plane can be caused by a load assembly, which takes the form of a first operating assembly directly attached to the rotor-support assembly, by moving one of the first operating assemblies or by selecting first operating assemblies with different weights.

[0066] The second operating component 34 is placed on the base plate of the auxiliary unit and is therefore indirectly attached to the rotor-support assembly only via the connection between the auxiliary unit and the main unit. The center of gravity of the second operating component is designated as the second COG. This second COG is positioned further away from the transverse plane 10. The displacement of the COG from the center plane due to different positions of the second operating component can be caused by the load components indirectly attached to the rotor-support assembly.

[0067] The center of gravity of the auxiliary unit is marked as AU-COG in the diagram. The distance from the rotor plane 80 to AU-COG is greater than the distance from the rotor plane to the first COG.

[0068] The first COG of the first operating component is upwind relative to the COG, while the second COG of the second operating component is downwind relative to the COG.

[0069] Figure 9a Another assembly structure for connecting the main frame to the operating components is illustrated. In the illustrated embodiment, assembly structure 90 connects transformer 91 to the main frame. At the upper end of the assembly structure, a transverse pin 92 can be suspended from the main frame, while at the lower end, the assembly structure can be bolted to the main frame via holes 93. The assembly structure also includes a lower support structure 94 on which the transformer can be supported, for example, on the floor of the nacelle until final assembly and attachment to the main frame. In particular, the transformer can be placed on the floor of an auxiliary unit, and once the auxiliary unit is attached to the main unit, the transformer is bolted to the main frame.

[0070] Figure 9b An alternative assembly structure is illustrated, in which both the upper and lower ends include pins 92 and 95 to be suspended on the main frame.

[0071] Figure 10 An alternative assembly structure is illustrated, wherein the upper and lower ends of one side include bolt structures 100 to engage the main frame, and the upper and lower ends of the other side of the assembly structure form hook structures 101 for suspending the operating components.

[0072] Figure 11 The illustrations schematically depict main and auxiliary units as separate units assembled either before or after the nacelle is mounted on the tower. The reference numerals also refer to... Figure 3 Wind turbines in the middle.

[0073] Figures 12 to 15 Four different embodiments of the unit fixing structure forming the interface between the main unit and the auxiliary unit are illustrated. In each of these four figures, the main unit 121 and the auxiliary unit 122 are connected by a cooperative structure forming the unit fixing structure, which will be described in further detail below.

[0074] exist Figure 12 In the process, the collaborative structure consists of a bracket 123, through which the main unit and the auxiliary unit are connected by bolts.

[0075] exist Figure 13 In China, the collaborative structure consists of... Figure 12 The support used is a similar lower support 123. At the upper edge, the main unit and the auxiliary unit are assembled by a hook 131 pivotally connected to the main unit at a hinge point 133. The hook can rotate as shown by arrow 132 and, when in the illustrated position, engages the edge support of the auxiliary unit. When the lower support 123 is removed and the hook 131 is rotated into the main unit, the auxiliary unit can be lowered to the ground.

[0076] Figure 14 The implementation methods in can be compared with Figure 13 The implementation method is similar to that in the previous one, but the lower bracket is replaced with the upper bracket 141, and the hook is placed at the lower edge.

[0077] exist Figure 15 In this configuration, the auxiliary unit is bolted to the main unit using a lower bracket and an upper bracket, and a sliding support 151 supports the lower surface of the auxiliary unit when the bolts are attached. If it is desired to lower the auxiliary unit to the ground (e.g., for replacement or maintenance of operating components), the sliding support can be slid to the left and the auxiliary unit can be lowered, for example, by using a crane built into the main unit.

[0078] exist Figures 12 to 15In any of the illustrated embodiments, a bracket or hook guides the load from the auxiliary unit to a rigid portion of the main unit, for example, to a load-bearing column (e.g., a corner post of the main unit). Various structural features can directly connect the bracket or hook carrying the auxiliary unit to the main frame in the main unit, thereby establishing a load path to the tower. Thus, the auxiliary unit is indirectly connected to the tower via the main unit.

[0079] Apart from Figures 12 to 15 In addition to the hook and bracket unit fixing structure illustrated herein, the assembly structure (e.g. in) Figure 4 , Figure 8 , Figure 9a , Figure 9b ,as well as Figure 10 (As shown in the diagram) the operating components (e.g., transformers) are also directly connected to the main frame inside the main unit.

[0080] The main unit and auxiliary unit can be connected after the operating components are placed in the auxiliary unit (e.g., after the transformer is placed in the auxiliary unit). The operating components can be placed, for example, on the base plate of the auxiliary unit, and when the auxiliary unit is secured to the main unit, it may be desirable that the weight of the operating components be primarily or entirely supported by the main frame in the main unit.

[0081] During assembly, loads from the operating components are transferred from the auxiliary unit (e.g., from the base plate of the auxiliary unit) to the main frame. This load transfer can occur during or after the auxiliary unit is attached to the main unit.

[0082] In one process, as the auxiliary unit is lowered to its position fixed to the main unit, the operating components are held by the assembly structure. When the auxiliary unit reaches its assembly position, the load is transferred from the auxiliary unit to the main unit, and specifically to the main frame within the main unit.

[0083] In another process, the auxiliary unit is lowered to the position where it is secured to the main unit. Subsequently, upon reaching the assembled position of the auxiliary unit, the load is transferred from the auxiliary unit to the main unit. This may include, for example, securing the operating component to the assembly structure, and optionally, removing or lowering the support between the operating component and the base plate of the auxiliary unit, thereby allowing the entire load to be transferred to the main frame.

[0084] In another alternative process, the auxiliary unit is held at an angle relative to the horizontal plane while being lowered to the appropriate position. When the first end of the auxiliary unit reaches the correct level, it is secured to the main unit. The operating component is placed at the opposite second end of the auxiliary unit, and at the point when the first end is being connected to the main unit, the operating component is still supported by the auxiliary unit, for example, on its base plate. As the first end is secured, the second end is lowered, and the operating component is held by the assembly structure. During the continued lowering of the second end, the weight of the operating component is transferred from the auxiliary unit to the main frame, and finally, the second end of the auxiliary unit is attached to the main unit.

[0085] In another alternative process, the auxiliary unit is lowered to the position where it is secured to the main unit. During the lowering of the auxiliary unit, the operating components are clamped by the assembly structure, and the lifting force from the crane is simultaneously adjusted to accommodate changing balance as the operating components are clamped. When the auxiliary unit reaches its assembled position, the load is transferred from the auxiliary unit to the main unit and remains balanced due to the dynamic adjustment of the lifting force (i.e., adjustment is made while the auxiliary unit is being lowered).

Claims

1. A wind turbine comprising a tower (3), a nacelle (2) mounted on the tower, and a rotor defining a rotor axis (7) extending along a vertical central plane (8), and the wind turbine being configured to harvest wind energy by rotating blades (5) about the rotor axis in a direction of rotor rotation, the nacelle comprising a rotor-support assembly including a main frame (40) forming a load path from the rotor to the tower and receiving a certain amount of torque caused by the rotation of the rotor, wherein, The center of gravity COG of the nacelle is offset from the central plane (8) in a direction relative to the direction of rotation of the rotor to counteract the torque caused by the rotation of the rotor.

2. The wind turbine according to claim 1, wherein, The rotor rotates clockwise when viewed from the wind side of the rotor, and the COG is offset to the left of the central plane.

3. The wind turbine according to claim 1, wherein, One or more operating components (34, 35) forming part of the power conversion system are configured to have a composite offset COG.

4. The wind turbine according to claim 3, wherein, The operating components include transformers and / or converters.

5. The wind turbine according to claim 1, wherein, The nacelle includes: a main unit (20) including the rotor-support assembly; and a first auxiliary unit (21) attached to the main unit and housing one or more operating components.

6. The wind turbine according to claim 5, wherein, The first auxiliary unit houses the first transformer and the first converter.

7. The wind turbine according to claim 6, wherein, The distance from the first converter to the center plane is greater than the distance from the first transformer to the center plane.

8. The wind turbine according to claim 6, wherein the wind turbine includes a second auxiliary unit (22), and the first auxiliary unit and the second auxiliary unit are attached to the main unit on opposite sides of the central plane.

9. The wind turbine according to claim 8, wherein, The second auxiliary unit accommodates operating components, wherein the operating components of the first auxiliary unit and the operating components of the second auxiliary unit are arranged asymmetrically about the central plane.

10. The wind turbine according to claim 8 or 9, wherein, The second auxiliary unit accommodates a second transformer and a second converter, wherein the distance from the first converter to the central plane is greater than the distance from the second converter to the central plane.

11. The wind turbine according to any one of claims 1 to 9, wherein, The nacelle is rotatably connected to the tower of the wind turbine to rotate about a yaw axis (9) extending along a vertical transverse plane (10) perpendicular to the vertical center plane (8), wherein the transverse plane is located between the COG and the rotor.

12. The wind turbine according to any one of claims 3 to 9, wherein, The first operating component of the operating assembly for power conversion is attached to the rotor-support assembly such that the first center of gravity of the first operating component is headwind relative to the COG of the nacelle.

13. The wind turbine according to any one of claims 3 to 9, wherein, The second operating component of the operating assembly for power conversion is attached to the rotor-support assembly such that the second center of gravity of the second operating component is downwind relative to the COG of the nacelle.

14. The wind turbine according to any one of claims 3 to 9, wherein, The rotor-support assembly includes a main frame and a main bearing housing (50) attached to the main frame, the main bearing housing including a main bearing for rotational suspension of the rotor shaft relative to the main frame, and wherein the main bearing housing forms part of a load path from the operating assembly to the tower.

15. The wind turbine according to any one of claims 3 to 9, wherein, The operating components are directly attached to the rotor-support assembly.

16. The wind turbine according to any one of claims 3 to 9, wherein, The operating components are indirectly attached to the rotor-support assembly.

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