Wind turbine with a nacelle having an offset center of gravity

Abstract

The wind turbine comprises a tower, a nacelle mounted to the tower, and a rotor defining a rotor axis extending in a vertical central plane and adapted to extract wind energy by rotation of blades about the rotor axis in a rotor rotation direction. The nacelle comprises a rotor support assembly comprising a main frame, defines a load path from the rotor to the tower, and is adapted to receive rotor torque caused by rotor rotation. To reduce tower loads and provide a potentially cheaper construction, the nacelle has a center of gravity offset from the central plane in a direction relative to the rotor rotation direction to counteract rotor torque.

Description

Technical Field

[0001] The present disclosure relates to a wind turbine comprising a tower, a nacelle attached to the tower, and a rotor that collects wind energy by rotation of the rotor about a rotor shaft. The nacelle comprises a rotor support assembly that forms a load path from the rotor to the tower, and a main bearing attached to the rotor support assembly and supporting the rotation of the rotor with respect to the rotor support assembly.

Background Art

[0002] Wind turbines are increasing in size, both from the perspective of their nominal output and from the perspective of the physical dimensions of the individual components of the wind turbine. Therefore, in order to accommodate the necessary wind turbine components, the size of the nacelle also needs to be increased. Wind turbines are typically transported from the location where the individual components are manufactured to the operating location where the wind turbine is installed by road, rail, ship, or a combination thereof.

[0003] The increase in size leads to an increase in the loads that have to be accommodated at multiple locations of the wind turbine. Inside the nacelle, it is necessary to address the problem of torque-based loads, i.e., the reaction loads generated from the rotor when the power train exerts force. Considerable reaction torque is exerted from the power train, especially the gearbox. In many designs, the torque from the drive system is taken into the frame carrying the gearbox via a torque arm. Usually, such forces are directed towards the main frame and experienced as asymmetric loads. Therefore, the rotor support components need to be configured and dimensioned to cope with the torque.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An objective of embodiments of this disclosure is to reduce loads, particularly reaction loads generated from the rotor when energy is exerted in the drive train. In particular, to reduce such asymmetric loads on the tower of a wind turbine, and thus potentially reduce the weight, size, and cost of the wind turbine, especially the tower portion. This can potentially reduce transportation and handling costs without limiting the possible size of the wind turbine. A further objective is to provide a good balance between weight distribution and modularity. [Means for solving the problem]

[0005] In accordance with these and other purposes, the Disclosure provides, in a first embodiment, a wind turbine comprising a tower, a nacelle mounted on the tower, and a rotor having defined a rotor axis extending in a vertical central plane and configured to collect wind energy by the rotation of blades in the direction of rotor rotation about the rotor axis.

[0006] The nacelle includes a rotor support assembly with a main frame, forming a load path from the rotor to the tower and receiving torque induced by the rotation of the rotor.

[0007] The nacelle receives the torque induced by the rotation of the rotor. Reduce Therefore, the rotation method of the rotor It has a center of gravity (COG) that is offset from the central plane in a direction opposite to the direction of gravity.

[0008] Since the COG is offset to counteract rotor torque, the load on the tower resulting from this asymmetric torque is reduced, and the tower and tower interface between the tower and the nacelle can be selectively smaller and less expensive, including a yaw assembly for yawing the nacelle.

[0009] When viewing the rotor from the wind side, clockwise rotation of the rotor may be considered. In this case, the COG should be displaced to the left of the center plane.

[0010] Unusually for wind turbines, if the rotor rotates counterclockwise, the COG should be displaced to the right of the central plane.

[0011] The nacelle can be transported by the tower directly or indirectly by the tower via an intermediate tower structure. If the wind turbine is of the traditional horizontal axis type, the nacelle is usually transported by a yawing arrangement between the top of the tower and the nacelle. However, this disclosure may also relate to a type of multi-rotor wind turbine in which one or more nacelles are transported by a transverse beam structure, which is then transported by the tower, for example, via a yawing arrangement between the tower and the transverse beam structure.

[0012] This disclosure may relate to an upwind wind turbine or a downwind wind turbine.

[0013] The wind turbine may be a direct-drive wind turbine, typically having a generator located outside the nacelle, or the wind turbine may have a generator located in the main unit. The main unit supports the rotor via a rotor shaft.

[0014] The nacelle comprises 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 yawing arrangement. The rotor support assembly comprises a main frame in the form of a cast part, such as a part cast from a single piece.

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

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

[0017] In developing a turbine modularization system, the nacelle may include a main unit comprising a rotor support assembly, a first auxiliary unit attached to the main unit, and a first auxiliary unit housing the operating components for power conversion. Such a configuration offers assembly advantages, as the units are produced at a manufacturing facility located away from where the wind turbine will be erected, and as subsets of the entire nacelle, they are transported more efficiently due to their smaller size and weight. At the site where the wind turbine will be installed, the units can be assembled either on the ground beside the tower or on top of the tower.

[0018] The operating component may include a first transformer and a first transducer, and the distance from the first transducer to the center plane may be greater than the distance from the first transformer to the center plane.

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

[0020] By providing a major actuating component with considerable weight within the auxiliary unit, compared to conventional designs, it provides an opportunity for a large resulting displacement of the center of gravity to counteract the reaction torque. The second auxiliary unit comprises an actuating component for power conversion, and the actuating components of the first and second auxiliary units may be positioned asymmetrically with respect to the center plane to provide a COG offset away from the center plane.

[0021] The second auxiliary unit comprises a second transformer and a second transducer, and the distance from the first transducer to the center plane may be greater than the distance from the second transducer to the center plane. This allows the transducer to contribute to a shift of the COG away from the center plane.

[0022] The nacelle may be rotationally connected to the wind turbine tower for rotation about a yaw axis extending in a vertical cross-section perpendicular to the vertical center plane. In this embodiment, the cross-section may be between the COG and the rotor, i.e., the COG is behind the vertical yaw axis as viewed from the direction of the wind.

[0023] A first operating component for power conversion, particularly a transformer, can be attached to the rotor support assembly such that the first center of gravity (referred to herein as the first COG) of the first operating component is upwind of the COG. Upwind means the direction of the wind when the rotor is arranged in an upper operating position relative to the wind.

[0024] A second component for power conversion, particularly a converter, is attached to the rotor support assembly such that when the rotor is arranged in an upper operating position relative to the wind, the second center of gravity (referred to herein as the second COG) of the second component is downwind of the COG in the direction away from the wind. A first operating component for power conversion, particularly a transformer, can be attached to the rotor support assembly such that the first center of gravity (referred to herein as the first COG) of the first operating component is upwind of the COG. Upwind means the direction of the wind when the rotor is arranged in an upper operating position relative to the wind.

[0025] The rotor support assembly can comprise a main frame and a main bearing housing attached to the main frame, the main bearing housing comprising a main bearing for the 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 to the tower, particularly from the first operating component.

[0027] Displacement of the COG away from the central plane can occur due to load components, for example, a first operating component for power conversion being directly attached to the rotor support assembly, for example, being directly attached to the main frame.

[0028] Displacement of the COG away from the central plane can be caused by load components, for example, a second operating component for power conversion being directly attached to the rotor support assembly via, for example, an auxiliary unit and a main unit to the main frame.

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

[0030] The auxiliary unit and / or the main unit can be formed with a size and / or outer shape equivalent to that of a shipping cargo container. Thereby, each unit inherits the advantages of a shipping cargo container regarding handling, transportation, and storage. For example, shipping of cargo containers can be performed anywhere in the world by ships, trains, trucks, etc. and can be performed at a lower cost compared to bulk transportation.

[0031] When the main unit and / or the auxiliary unit is a shipping cargo container, cost reduction is even more significant. A sea freight cargo container, also called an intermodal container, standard cargo container, box container, ocean freight container, or ISO container generally refers to a container used for storing and moving materials and products in a global containerized intermodal freight transport system for intercontinental transportation. The shipping cargo container may conform to the dimensions and structural specifications of ISO standard ISO668:2013 for series 1 cargo containers.

[0032] The main unit and the auxiliary unit may be arranged side by side not spaced apart from each other in the direction of the rotation axis but spaced apart in the central plane in a direction away from the rotation axis defined by the rotor support assembly.

[0033] Each of the two auxiliary units has half the size of one transport cargo container, according to the dimensional and structural specifications of ISO standard ISO 668:2013 for Series 1 cargo containers, and the two halves of the container are assembled to form one container during transport, and can be divided into two auxiliary units and arranged, for example, on the opposite side of the main unit. The container may be divided in particular at the interface extending along the longitudinal direction of the container, i.e., the longest dimension of the container.

[0034] The embodiments will be described below with reference to the following drawings. [Brief explanation of the drawing]

[0035] [Figure 1a] This diagram shows a wind turbine with a nacelle mounted on a tower. [Figure 1b] This diagram shows a wind turbine with a nacelle mounted on a tower. [Figure 1c] This diagram shows a wind turbine with a nacelle mounted on a tower. [Figure 2] This diagram shows a nacelle comprising a main unit and two auxiliary units. [Figure 3] This is a perspective view of Nasser. [Figure 4] This figure shows a part of the rotor support assembly, namely the main frame formed as a single, cast part. [Figure 5] This diagram shows the rotor support assembly as viewed from the end of the rotor shaft. [Figure 6] This diagram shows different embodiments of the nacelle as viewed from above. [Figure 7] This diagram shows different embodiments of the nacelle as viewed from above. [Figure 8] This diagram shows details regarding the center of gravity of different components. [Figure 9a]This diagram shows the different interfaces between the operating components and the main frame. [Figure 9b] This diagram shows the different interfaces between the operating components and the main frame. [Figure 10] This diagram shows the different interfaces between the operating components and the main frame. [Figure 11] This diagram shows that the main unit and the auxiliary unit are separate devices. [Figure 12] This diagram shows the different interfaces between the main unit and the auxiliary unit. [Figure 13] This diagram shows the different interfaces between the main unit and the auxiliary unit. [Figure 14] This diagram shows the different interfaces between the main unit and the auxiliary unit. [Figure 15] This diagram shows the different interfaces between the main unit and the auxiliary unit. [Modes for carrying out the invention]

[0036] Detailed descriptions and specific examples are given by illustration only, illustrating embodiments, and various changes and modifications within the spirit and scope of this disclosure will be apparent to those skilled in the art from this detailed description.

[0037] Figures 1a and 1b show a wind turbine 1 having a nacelle 2 mounted on a tower 3. A hub 4 supporting three rotor blades 5 forms the rotor, which is supported by a rotor support assembly within the nacelle 2. Typically, the rotor support assembly includes a gear array and a rotor shaft connecting the generator to the hub. However, the gears are not necessarily required, as the generator can be driven directly by the shaft. Figure 1b shows a direct-drive wind turbine where the generator 6 is located outside the nacelle. The rotor support assembly further includes a main frame and main bearings in a main bearing housing connected to the main frame.

[0038] As the rotor rotates, energy is dissipated into the drivetrain, particularly as bearing losses, optional gearbox losses, and as energy transferred to the generator for conversion into electrical energy. In response to this dissipated energy, the rotor support assembly must counteract the torque generated by the rotor as it exerts force in the drivetrain. This reactive torque is perceived as a load directed from the rotor support assembly to the tower.

[0039] In this definition, the rotor rotates around the rotor axis 7. A vertical central plane 8 that bisects the wind nacelle 2 longitudinally can be defined by the rotor axis extending within this plane. To orient the rotor into the wind, the nacelle 2 is rotatable around the vertical yaw axis 9. A transverse plane 10 can be defined that extends laterally, and the yaw axis extends within this transverse plane 10. The transverse plane 10 is perpendicular to the central plane. The yaw axis 9 extends into both the transverse plane 10 and the central plane 8.

[0040] Figure 1c shows the central plane and cross-section of the nacelle viewed from above. The tower is indicated by circle 11 and has a radius dimension indicated by arrow 12.

[0041] Figure 2 shows a nacelle having a modular structure in which specific operating components are provided in separate modules. More specifically, the nacelle comprises a main unit 20 and two auxiliary units 21, 22. The auxiliary units are assembled separately, transported, and mounted on the main unit. A cooling area 23 is located at the top of the nacelle. The cooling area is formed by heat exchangers that can form part of the main unit and / or auxiliary units. The main unit 20 is mounted to the tower 3 via a rotor support assembly and a yawing arrangement (not shown). The yawing assembly allows the nacelle 2 to rotate around the yaw axis to orient the rotor towards the wind.

[0042] Figure 3 shows a perspective view of the nacelle 2 of Figure 2. In Figure 3, the outer wall of the nacelle 2 is transparent (for illustrative purposes), thereby revealing the internal components of the nacelle 2 and the wind turbine components housed therein. The main unit 20 houses a rotor support assembly that supports the rotor. The rotor support assembly comprises, in particular, a main frame and a main bearing 31 attached to the main frame to facilitate the rotation of the rotor.

[0043] Figure 3 shows a perspective view of the nacelle 2 of Figure 2. In Figure 3, the outer wall of the nacelle 2 is transparent (for illustrative purposes), thereby revealing the internal components of the nacelle 2 and the wind turbine components housed therein. The main unit 20 houses a rotor support assembly that supports the rotor. The rotor support assembly comprises, in particular, a main frame and a main bearing 31 attached to the main frame to facilitate the rotation of the rotor.

[0044] The disclosed wind turbine further comprises a gear arrangement 32 and a generator 33 sequentially arranged behind the hub 4 along the direction defined by the rotor's axis of rotation. The components within the main unit primarily form part of the drive system. In another embodiment, the generator is located outside the nacelle, as shown in Figure 1b.

[0045] The auxiliary unit 22 houses the main components that constitute part of the power conversion system, more specifically the converter unit 34 and the transformer unit 35. In another embodiment, the auxiliary unit 22 houses, for example, an electrolytic cell stack 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 parts, such as a crane. Hereinafter, such parts will be referred to as operating components.

[0046] The operating components are selected and positioned such that the center of gravity (COG) of the complete nacelle is offset from the central plane in a direction relative to the rotor rotation direction, thereby receiving torque. reduction And remove them as needed.

[0047] Figure 4 shows the main frame 40, formed as a single, cast part. The main frame further comprises an assembly structure 41 bolted directly to the cast part. The rotor support assembly forms part of the nacelle and defines the load path from the rotor to the tower 3. In the embodiments of Figures 1 and 2, the rotor support assembly is typically located within the main unit 20.

[0048] Figure 5 shows the rotor support assembly viewed from the rear of the nacelle toward the rotor, in the upwind direction. The main bearing housing 50 is attached to the main frame 40. The rotor rotates relative to the main frame by the main bearings. Arrow 51 indicates the torque acting on the rotor support assembly.

[0049] Figure 5 shows the center of gravity of the nacelle (COG) separated from the central plane 8, as indicated by arrow 53. The load component 52, which plays the role of moving in that manner, is positioned on the assembly structure 41. This is illustrated in a schematic manner. The COG that does not exist on the center plane is the empirically generated torque caused by the rotation of the rotor. Ku 51 Reduce Provided by ShiftCOG Reduction Torque is indicated by arrow 54. As will be discussed later, the load component is the main working component with a large weight, such as a transformer. In the current latest generation of designs with ratings of 10 to 15 MW, the weight of a transformer can be several tons, up to 20 tons, and therefore its placement has a significant impact on the position of the COG.

[0050] When mounted to the main frame, the main bearing housing forms part of the load path from the load component 52 to the nacelle and tower.

[0051] Figure 6 is a top view of the nacelle 2. The main unit 20 includes a rotor support assembly 40, and the auxiliary units 21 and 22 each include a converter 34 and a transformer 35.

[0052] The main frame 40 includes a pair of assembly structures 41, 42 on both sides of the main frame 40. In this example, the actuation component in the form of a transformer 35 is mounted directly to the main frame. The main frame is fixed to the tower via a yaw assembly that allows rotation around the yaw axis. Thus, the main frame defines the load path from the actuation component 35 that extends directly through the main frame to the tower.

[0053] Other actuation components 34 are indirectly attached to the rotor support assembly via auxiliary units. The second actuation component is attached, for example, to the floor or wall of the auxiliary unit, and the auxiliary unit is attached to the main unit. The auxiliary unit and the main unit thereby define the load path from the second actuation component through the auxiliary unit to the rotor support assembly and tower.

[0054] Figure 6 shows that the operating component 35, in this case the transformer 35, is positioned at the same distance from the center plane 8, while the second operating component, exemplified by the transducer 34, is positioned at different distances from the center plane. This causes the COG to move away from the center plane 8, thereby canceling out the empirical torque.

[0055] The optimal reverse action is obtained by different combinations of positions. Transformers are typically heavier than transducers (however, the weight of the transducer is several tons, at most 15 tons), and a small displacement of transformer 35 has a greater effect than a relatively large displacement of transducer 34.

[0056] Figure 7 shows another example where only one auxiliary unit is positioned on one side of the central plane 8, and therefore the entire mass of the auxiliary unit shifts the nacelle's COG very significantly from the central plane, thus counteracting the empirical torque.

[0057] Figure 8 shows a nacelle with a single piece, a cast main frame, as in Figure 4. The first actuation component 35 is mounted directly to the rotor support assembly, which has the center of gravity of the first actuation component marked as the first COG. This first COG is located near the cross-section 10. Displacement of the COG away from the center plane can be caused by load components in the form of the first actuation component mounted directly to the rotor support assembly, by moving one of the first actuation components or by selecting first actuation components of different weights.

[0058] The second actuation component 34 is positioned on the floor of the auxiliary unit and is therefore indirectly attached to the rotor support assembly via a connection between the auxiliary unit and the main unit. The center of gravity of the second actuation component is marked as the second COG. This second COG is located further away from the cross-section 10. Due to the different positions of the second actuation component, the displacement of the COG away from the center plane is caused by the load component indirectly attached to the rotor support assembly.

[0059] The auxiliary unit has a center of gravity marked as AU-COG in the drawing. The distance from the rotor surface 80 to AU-COG is greater than the distance from the rotor surface to the first COG.

[0060] The first COG of the first component is upwind relative to the COG, and the second COG of the second component is downwind relative to the COG.

[0061] Figure 9a shows another assembly structure connecting the main frame to the operating components. In the illustrated embodiment, the assembly structure 90 connects the 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, and at the lower end of the assembly structure, the assembly structure can be bolted to the main frame through holes 93. The assembly structure further includes a lower support structure 94 that can carry the transformer to the floor of the nacelle, for example, until final assembly and mounting to the main frame. In particular, the transformer can be placed on the floor of the auxiliary unit and bolted to the main frame when the auxiliary unit is attached to the main unit.

[0062] Figure 9b shows an alternative assembly structure with pins 92 and 95, both of which are suspended from the main frame at the upper and lower ends.

[0063] Figure 10 shows an alternative assembly structure in which both the upper and lower ends of one side of the assembly structure engage with the main frame, and both the upper and lower ends of the other side of the assembly structure form a hook structure 101 for suspending the operating component.

[0064] Figure 11 schematically shows that the main unit and auxiliary unit are separate units, assembled either before or after the nacelle is attached to the tower. Reference numbers also refer to the wind turbine in Figure 3.

[0065] Figures 12 to 15 show four different embodiments of the unit fixing structure that forms the interface between the main unit and the auxiliary unit. In each of these four figures, the main unit 121 and the auxiliary unit 122 are connected by a cooperating structure that forms the unit fixing structure, which will be described in more detail below.

[0066] In Figure 12, the main unit and the auxiliary unit are connected by a bracket 123 with bolts, forming a collaborative structure.

[0067] In Figure 13, the cooperative structure is comprised of a lower bracket 123 similar to that used in Figure 12. At the top, the main unit and the auxiliary unit are assembled by a hook 131 that pivots to the unit at a hinge point 132. The hook can rotate as indicated by arrow 133 and engages with the edge bracket 134 of the auxiliary unit when in the illustrated position. When the lower bracket 123 is removed and the hook 131 rotates to the main unit, the auxiliary unit can be lowered to the ground.

[0068] The embodiment shown in Figure 14 is equivalent to the embodiment shown in Figure 13, except that the lower bracket is replaced by the upper bracket 141, and the hook is positioned on the lower edge.

[0069] In Figure 15, a lower bracket and an upper bracket are used to bolt the auxiliary unit to the main unit, and a sliding support 151 supports the underside of the auxiliary unit with the bolts attached. For example, if it is desired to lower the auxiliary unit to the ground for replacement or maintenance of the operating components, the sliding support can be slid to the left, and the auxiliary unit can be lowered, for example, using a crane built into the main body.

[0070] In any of the embodiments shown in Figures 12 to 15, the bracket or hook guides the load from the auxiliary unit to the rigid portion of the main unit, such as the load-carrying columns, including the corner columns of the main unit. Various structural features allow the bracket or hook that carries the auxiliary unit to be directly connected to the main frame within 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.

[0071] In addition to the hook and bracket unit fixing structures shown in Figures 12 to 15, the assembly structure (for example, shown in Figures 4, 8, 9, and 10) directly connects operating components, such as transformers, to the main frame within the main unit.

[0072] The main unit and the auxiliary unit may be joined after the operating components are placed in the auxiliary unit, for example, after the transformer is placed in the auxiliary unit. The operating components may be placed, for example, on the floor of the auxiliary unit, and if the auxiliary unit is fixed to the main unit, it is desirable that the weight of the operating components be supported, primarily or entirely, by the main frame within the main unit.

[0073] During the assembly process, loads from the operating components are transmitted from the auxiliary unit, for example, from the floor of the auxiliary unit to the main frame. This load transmission may occur while the auxiliary unit is attached to the main unit or afterward.

[0074] In one procedure, the operating components are held by the assembly structure while the auxiliary unit is lowered to a position where it is fixed to the main unit. Once 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.

[0075] In the alternative procedure, the auxiliary unit is lowered to a position where it is fixed to the main unit. Then, i.e., when it reaches the assembly position of the auxiliary unit, the load is transferred from the auxiliary unit to the main unit. This includes, for example, fixing the actuation component to the assembly structure and selectively removing or lowering the support between the actuation component and the floor of the auxiliary unit, thereby allowing the entire load to be transferred to the main frame.

[0076] In an alternative procedure, the auxiliary unit is held at an angle to the horizontal while being lowered into place. When the first end of the auxiliary unit reaches the correct level, it is secured to the main unit. The actuation component is positioned on the opposite side of the auxiliary unit, at the second end, and while the first end is joined to the main unit, the actuation component is still carried by the auxiliary unit, for example, onto the floor of the auxiliary unit. Once the first end is secured, the second end descends, and the actuation component is gripped by the assembly structure. During the continued descent of the second end, the weight of the actuation 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.

[0077] In an alternative procedure, the auxiliary unit is lowered to a position where it is fixed to the main unit. While the auxiliary unit is being lowered, the operating components are gripped by the assembly structure, and the lifting force from the crane is simultaneously adjusted to adapt to the change in balance when the operating components are gripped. Once the auxiliary unit reaches its assembly position, the load is transferred from the auxiliary unit to the main body, and balance is maintained by dynamic adjustment of the lifting force, i.e., adjustment while lowering the auxiliary unit.

Claims

1. A wind turbine comprising a tower, a nacelle (2) attached to the tower (3), and a rotor that defines a rotor shaft (7) extending in a vertical central plane (8) and extracts wind energy by the rotation of blades (5) in the direction of rotor rotation around the rotor shaft, The nacelle comprises a rotor support assembly having a main frame (40), forming a load path from the rotor to the tower, and receiving a certain amount of torque induced by the rotation of the rotor. The center of gravity (COG) of the nacelle is offset from the rotor axis (7) on the central plane (8) in a direction opposite to the direction of rotation of the rotor, and the torque induced by the rotation of the rotor is reduced by the torque due to the offset of the COG in the wind turbine.

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

3. A wind turbine according to claim 1 or 2, wherein one or more operating components (34, 35) constituting part of a power conversion system are arranged to have a resulting offset COG.

4. A wind turbine according to claim 3, wherein the operating component comprises a transformer and / or a converter.

5. A wind turbine according to any one of claims 1 to 4, wherein the nacelle comprises a main unit (20) having the rotor support assembly and a first auxiliary unit (21) attached to the main unit and housing one or more operating components.

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

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

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

9. A wind turbine according to claim 8, wherein the second auxiliary unit houses the operating components, and the operating components of the first auxiliary unit and the second auxiliary unit are arranged asymmetrically with respect to the central plane.

10. A wind turbine according to claim 8 or 9, wherein the second auxiliary unit houses a second transformer and a second transducer, and the distance from the first transducer to the center plane is greater than the distance from the second transducer to the center plane.

11. A wind turbine according to any one of claims 3 to 10, wherein the nacelle is rotatably connected to the tower of the wind turbine so as to rotate about a yaw axis (9) extending in the vertical central plane (8) and the vertical cross-section (10), the cross-section being located between the COG and the rotor.

12. A wind turbine according to any one of claims 3 to 11, wherein the first operating component of the operating components for power conversion is mounted on the rotor support assembly such that the first center of gravity (first COG) of the first operating component is upwind with respect to the COG of the nacelle.

13. A wind turbine according to any one of claims 3 to 12, wherein the second center of gravity (second COG) of the second operating component among the operating components for power conversion is attached to the rotor support assembly such that the second center of gravity of the second operating component is downwind with respect to the COG of the nacelle.

14. A wind turbine according to any one of claims 3 to 13, wherein the rotor support assembly comprises a main frame and a main bearing housing (50) attached to the main frame, the main bearing housing comprises a main bearing for rotationally suspending a rotor shaft relative to the main frame, and the main bearing housing forms part of the load path from the operating component to the tower.

15. A wind turbine according to any one of claims 3 to 14, wherein the operating components are directly attached to the rotor support assembly.

16. A wind turbine according to any one of claims 3 to 14, wherein the operating component is indirectly attached to the rotor support assembly.

Images