KR101556188B1 - Wind turbine generator - Google Patents

Abstract

A wind power generator is disclosed. The wind power generator according to an embodiment of the present invention comprises a rotor connected to a blade rotated by wind; a nacelle connected to the rotor; a tower supporting the nacelle; and a vibration reduction unit located on the nacelle, and reducing and increasing resistance against the wind to reduce vibration of the tower, when stopping the rotation of the blade.

Description

WIND TURBINE GENERATOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind power generator, and more particularly, to a wind power generator capable of reducing vibration of a tower caused by wind.

Generally, typical types of power generation for generating electricity include thermal power generation using fossil fuel as an energy source and nuclear power generation using nuclear power.

However, thermal power generation has a problem of causing pollution due to utilization of the energy generated by the combustion of fossil fuel and a huge construction cost.

In addition, nuclear power generation is advantageous in producing a large amount of electricity, but an enormous facility cost is required to prevent radiation leakage, and a strong rebound of local residents is expected due to the risk of radiation leakage. Furthermore, There is always a risk of causing severe environmental destruction.

Therefore, researches are actively conducted to utilize natural energy such as wind power, tidal power, hydroelectric power, and solar energy as an energy source as a permanent energy source free from exhaustion problems due to firepower or nuclear power generation.

In particular, wind power generation is emerging as an alternative from the viewpoint of using clean energy sources among natural energy-based power generation. Wind power generation is easy to operate and manage, and can be operated unattended and automated. Therefore, the introduction has increased dramatically in recent years.

On the other hand, in the past, wind power generation structures were mainly located on land, but due to environmental problems caused by noise and vibration, power generation capacity has become larger, and aesthetics, As a result,

A wind turbine generator is a device for producing electric energy from wind-induced rotational energy. The wind turbine generator includes a rotor having a hub to which a plurality of blades rotated by the wind are connected, and a rotor And a tower supporting a blade, a rotor, and a nacelle.

The blade uses aerodynamically designed geometry to generate useful aerodynamic torques in the wind energy and generates electricity by rotating the generator using aerodynamic torques.

The blade must be able to support the load induced by its shape structurally as well as aerodynamic shape is important to increase the amount of electricity generated.

The load is dominant in the aerodynamic shape, but designing a blade that is as light as possible while supporting the same load through structural optimization is another important design technique.

On the other hand, wind turbines require periodic maintenance work. If the tower is vibrated by the wind while the wind turbine is stopped for the failure and periodical maintenance work due to the operation of the wind turbine generator, the efficiency of the maintenance work may be reduced and the safety of the operator may be problematic.

[Patent Document 1] Korean Patent Laid-Open No. 10-2013-0059840 (Daewoo Shipbuilding & Marine Engineering Co., Ltd.)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wind power generator capable of reducing vibration of a tower due to wind during stoppage of a blade for maintenance work.

According to an aspect of the present invention, there is provided a rotor comprising: a rotor to which a blade rotated by wind is connected; A nacelle connected to the rotor; A tower for supporting the nacelle; And a vibration reduction unit located on the nacelle and reducing vibration of the tower by increasing or decreasing resistance to wind while stopping the rotation of the blade can be provided

Wherein the vibration reduction unit includes: a resistance body having a resistance to wind increasing or decreasing, the area facing the wind being changed according to a vibration direction of the tower so as to reduce vibration of the tower; A support for supporting both sides of the resistor; And a driver for rotating the resistor to change an area of the resistor facing the wind.

Wherein the resistor includes a blade portion having an airfoil cross section that is rotated according to a vibration direction of the tower and changes an area facing the wind, the drive portion is connected to one side of the blade portion, The wing portion is rotated to increase the area of the wing portion opposed to the wind, and when the tower is moved in a direction opposite to the wind direction, the wing portion is rotated so that the area of the wing portion opposed to the wind .

The wing portion is formed so that a trailing edge is relatively rotatable with respect to a leading edge, the driving portion is connected to a leading edge and a trailing edge of the wing portion, and the tower is moved in a direction opposite to the wind The front edge of the wing portion is rotated to increase the area facing the wind, and the trailing edge of the wing portion is rotated relative to the leading edge so that the wind is discharged in a direction opposite to the direction in which the wind flows along the trailing edge of the wing portion, The leading edge of the wing portion is rotated to reduce the area facing the wind and the trailing edge of the wing portion can be relatively rotated in parallel with the leading edge.

And a sensing unit installed in at least one of the nacelle and the tower to sense a vibration direction of the tower.

Embodiments of the present invention can improve the efficiency of maintenance work and solve safety problems by providing a vibration reduction unit that reduces the vibration of the tower due to wind while the blades are stopped for maintenance work.

1 is a schematic view of a wind turbine according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a vibration state of a tower according to an embodiment of the present invention.
3 is an enlarged perspective view showing a vibration reduction unit according to an embodiment of the present invention.
4 is a side view showing a vibration damping unit according to an embodiment of the present invention.
5 is a side sectional view showing an operating state of a wing according to an embodiment of the present invention when the tower moves in a direction opposite to the wind.
6 is a side cross-sectional view illustrating an operating state of a wing according to an embodiment of the present invention when the tower moves in the wind direction direction.
7 is a side sectional view showing an operating state of a wing according to another embodiment of the present invention when the tower moves in a direction opposite to the wind.
8 is a side sectional view showing an operating state of a wing according to another embodiment of the present invention when the tower moves in the wind direction direction.
9 is a flowchart showing a method of controlling the vibration of a wind turbine according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a schematic view of a wind turbine according to an embodiment of the present invention.

Referring to FIG. 1, a wind turbine generator 100 includes a plurality of blades 110 connected to a nacelle 130 and rotated by the wind, a plurality of blades 110 rotating in accordance with rotation of the blades 110, A rotor 120 having a hub 121 to which the rotor 120 and nacelle 130 are connected and a tower 140 supporting the rotor 110 and the rotor 120 and the nacelle 130.

The blade 110 is a kind of wing that is rotated by the wind to generate rotational motion.

The blade 110 disposed radially with respect to the rotor 120 has a streamlined blade shape so that it can be easily rotated by the wind.

The wind turbine 110 according to the present embodiment is provided with three blades 110 for maximizing the wind characteristics while seeking stability. However, the number of the blades 110 is not limited thereto, The scope of the rights of

The blade 110 is installed with a bidirectional type blade 110 freely rotatable in a clockwise or counterclockwise direction, and should be installed in consideration of the wind that flows toward the land in the daytime and the wind that flows toward the sea in the nighttime.

The hub 121 of the rotor 120 is a place where a plurality of blades 110 are connected.

The hub 121 has a substantially circular shape when viewed from the front, and may have a dome shape when viewed from the side.

One end of the hub 121 is connected to a nacelle 130 that receives the rotational motion of the blade 110 and generates electrical energy.

The nacelle 130 may be a mechanical part that plays an important role in driving the wind turbine generator such as generating electric energy by receiving the rotational motion of the blade 110, a gear box (not shown), and a generator (not shown), all of which are structurally coupled to each other.

Since the nacelle 130 is exposed to the outside air and is always exposed to snow, rain, sunlight, etc., a certain degree of rigidity must be ensured. Therefore, the outer surface of the nacelle 130 is made of a non-metallic or metal composite material having excellent durability.

The tower 140 supports the axial load on the structures such as the blades 110, the hub 121, and the nacelle 130,

The tower 140 may be divided into a lower tower at the lower part and an upper tower at the upper part.

The tower 140 is a pipe-type structure having an interior, and a cable or the like is passed through an inner space of the tower 140. The cable may be a variety of cables, including a dedicated power cable, communication cable, and the like.

Meanwhile, the wind turbine generator 100 temporarily stops the rotor 120 and the nacelle 130 including the blades 110 for a failure during the operation and periodic maintenance work.

During the operation of the wind power generator, the pitch angle of the blades 110 is adjusted to reduce the vibration of the tower 140 by the wind. However, since the blades 110 are stopped during the stoppage of the wind power generation, ) Can not be used.

1, the wind turbine generator 100 according to the present embodiment includes a vibration reduction unit 100 for reducing vibrations of the tower 140 or the like by wind when the blade 110 or the like is stopped for maintenance work, (150).

2 is a conceptual diagram illustrating a vibration state of a tower according to an embodiment of the present invention.

As described above, when the blade 110 or the like is stopped for maintenance work, the tower 140 is vibrated by the wind.

Specifically, as shown in FIG. 2, the tower 140 vibrates mainly in the forward and backward direction, which is the direction of the wind direction, because the tower 140 vibrates due to the influence of the wind, but can also vibrate in the left and right directions crossing the wind direction.

In this embodiment, since the vibration direction of the tower 140 is mainly caused by wind, it will be explained on the assumption that it vibrates in the wind direction direction.

 4 is a side view showing a vibration damping unit according to an embodiment of the present invention, and Fig. 5 is a side view showing a vibration damping unit according to an embodiment of the present invention, FIG. 6 is a side view showing the operation state of the wing according to an embodiment of the present invention when the tower moves in the direction of the wind; FIG. Fig.

3 and 4, the vibration damping unit 150 according to the present embodiment is positioned on the nacelle 130, and the tower 140 or the like vibrates due to wind during the maintenance work of the wind power generator 100, To reduce the risk of death.

The vibration reduction unit 150 is disposed on the nacelle 130 and has an area that opposes the wind according to the vibration direction of the tower 140 is changed to reduce the vibration of the tower 140, A driving unit 157 for changing the area of the resistor 151 which is connected to the resistor 151 and which rotates the resistor 151 to oppose the wind, And a sensing unit 159 installed at at least one of the nacelle 130 and the tower 140 to sense the vibration direction of the tower 140.

The sensing unit 159 senses the vibration direction of the tower 140.

The sensing unit 159 includes an acceleration sensor installed in at least one of the nacelle 130 and the tower 140 to sense the vibration direction of the tower 140. [

The acceleration sensor is installed in at least one of the nacelle 130 and the tower 140, and the vibration direction of the tower 140 due to the deformation and deformation of the tower 140 can be grasped.

When the 3D acceleration sensor is used, the trajectory of the tower 140 due to the vibration in the three-dimensional space can be grasped.

The area of the resistor 151 according to the present embodiment is changed depending on the vibration direction of the tower 140 sensed by the sensing unit 159 so that the resistance against the wind is increased or decreased to reduce the vibration of the tower 140 .

3 and 4, the resistor 151 according to the present embodiment is disposed on the upper surface of the nacelle 130. However, the resistor 151 may be disposed on both sides of the nacelle 130 and on the lower surface thereof.

The resistor 151 includes vanes 152 having an airfoil cross section whose area opposite to the wind is changed in accordance with the vibration direction of the tower 140.

A plurality of wing portions 152 are stacked on the upper surface of the nacelle 130. As shown in FIGS. 3 and 4, a plurality of wing portions 152 may be arranged on the upper surface of the nacelle 130 in the height direction.

In the present embodiment, the resistance to wind is adjusted by rotating the wing 152 to change the area facing the wind.

For example, as shown in FIG. 2, when the tower 140 is oscillated and moves out of the reference position and then is opposed to the wind and moves in the reference position direction (movement in the A direction) and the tower 140 is vibrated When moving in the direction opposite to the wind (movement in the direction B) beyond the reference position, the area of the wing 152 is increased to increase the resistance to wind.

5, by using the driving unit 157 to be described later, the blade unit 152 is rotated in the direction of increasing the area facing the wind to increase the resistance to wind, thereby increasing the vibration amplitude of the tower 140 Thereby reducing the vibration of the tower 140. [

As shown in Fig. 2, when the tower 140 is oscillated and moves out of the reference position and then moves in the direction of the reference position opposite to the direction opposite to the wind (wind direction of the wind) (C direction movement) (D direction movement) in the direction opposite to the wind direction, which is the wind direction of the wind, by vibrating away from the reference position, the area of the wing 152 is reduced to reduce the resistance to wind .

6, by using the driving unit 157 to rotate the wing 152 to reduce the area facing the wind to reduce the resistance to wind, the vibration amplitude of the tower 140 So that the vibration of the tower 140 is reduced.

The rotation of the wing 152 is performed by the driving unit 157.

The driving unit 157 is connected to one side of the wing 152 to change the area of the wing 152 facing the wind.

The driving unit 157 includes a driving motor that rotates the wing unit 152 in forward and reverse directions by forward and reverse rotations in accordance with the vibration direction of the tower 140 transmitted from the sensing unit 159.

FIG. 7 is a side sectional view showing an operating state of a wing according to another embodiment of the present invention when the tower moves in a direction opposite to the wind, and FIG. 8 is a cross- Fig. 8 is a side cross-sectional view showing an operating state of a wing portion according to another embodiment;

7 and 8, the wing 152a may have a trailing edge relative to the leading edge 152b so as to be rotatable relative to the leading edge 152b.

The driver 157 is connected to the leading edge 152b and the trailing edge 152c of the wing 152a when the trailing edge 152c of the wing 152a is formed to be relatively rotatable with respect to the leading edge 152b, And rotates the trailing edge 152c in opposition to the wind, separately from the rotation of the rotor 152b.

The operation of the wing 152a by the driving unit 157 when the trailing edge 152c is relatively rotatable with respect to the leading edge 152b of the wing 152a will now be described.

As shown in FIG. 2, when the tower 140 is vibrated and moves out of the reference position and then is opposed to the wind and moves in the reference position direction (movement in the A direction) and the tower 140 is vibrated, As shown in Fig. 7, in the case of moving in the direction opposite to the wind (movement in the direction B), the driving unit 157 rotates the leading edge 152b of the wing 152a in a direction to increase the area facing the wind And at the same time, the trailing edge 152c of the blade 152a is rotated relative to the leading edge 152b so as to be discharged in a direction opposite to the direction in which the wind is introduced.

As shown in Fig. 2, when the tower 140 is oscillated and moves out of the reference position and then moves in the direction of the reference position opposite to the direction opposite to the wind (wind direction of the wind) (C direction movement) 8, the drive unit 157 drives the wing (not shown) to move in the direction opposite to the direction opposite to the direction of the wind, 152a of the blade 152a to reduce the area opposed to the wind and rotate the trailing edge 152c of the blade 152a in parallel relative to the leading edge 152b.

That is, the driving unit 157 rotates the leading edge 152b and the trailing edge 152c of the wing 152a in the direction of reducing the area facing the wind, thereby reducing the resistance to wind.

The vibration control method of the wind turbine generator 100 according to an embodiment of the present invention will now be described.

9 is a flowchart showing a method of controlling the vibration of a wind turbine according to an embodiment of the present invention.

Referring to FIGS. 1, 2, and 5 to 9, when the tower 140 is vibrated by the wind during maintenance work on the wind turbine generator 100, problems arise in terms of efficiency of maintenance work and safety of the operator .

Therefore, there is a need to reduce the vibration of the tower 140 caused by the wind during the maintenance work.

In this embodiment, at least one of the nacelle 130 and the tower 140 is provided with an acceleration for sensing the vibration of the tower 140 caused by wind to detect the vibration of the tower 140 caused by the wind during the maintenance work, A sensing unit 159 including a sensor is installed (S100).

The sensing unit 159 is used to sense the vibration direction of the tower 140 according to the deformation of the tower 140 (S200).

In this embodiment, the wing portions 152 and 152a are rotated to change the area facing the wind to reduce the vibration of the tower 140 by controlling the resistance to wind.

First, it is determined whether the vibration direction of the tower 140 is the direction opposite to the wind (S300).

When the tower 140 is moved in the direction opposite to the wind, that is, when the tower 140 moves in the A direction and the B direction as shown in Fig. 2, the area of the wings 152 and 152a is increased, (S350).

As shown in FIGS. 5 and 7, by using the driving unit 157, the wings 152 and 152a are rotated in the direction of increasing the area facing the wind to increase the resistance to wind, Thereby reducing the vibration width of the tower 140.

Then, it is determined whether the vibration direction of the tower 140 is not the direction opposite to the wind, that is, whether the vibration direction of the tower 140 is opposite to the direction opposed to the wind (S400).

When the tower 140 is moved in the opposite direction to the wind, that is, as shown in Fig. 2, when the tower 140 moves in the C and D directions, the area of the wings 152, To reduce wind resistance.

6 and 8, by using the driving unit 157, the wings 152 and 152a are rotated in the direction of reducing the area facing the wind to reduce the resistance to wind, Thereby preventing the oscillation width from increasing and reducing the vibration of the tower 140.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Wind power generator 110: Blade
120: rotor 130: nacelle
140: Tower 150: Vibration reduction unit
151: Resistors 152 and 152a:
153: support part 157:
159:

Claims (5)

A rotor to which a blade rotated by the wind is connected;
A nacelle connected to the rotor;
A tower for supporting the nacelle; And
And a vibration reduction unit located on the nacelle and reducing the vibration of the tower by increasing or decreasing resistance to wind while stopping the rotation of the blade,
The vibration reduction unit includes:
And a blade portion having an airfoil section having an airfoil section whose resistance to wind is increased or decreased by changing an area facing the wind and being rotated along a vibration direction of the tower so as to reduce vibration of the tower;
A support for supporting both sides of the resistor; And
Wherein when the tower is moved in a direction opposite to the wind, the wing portion is rotated to increase the area of the wing portion facing the wind, and the tower is moved in a direction opposite to the direction in which the wind is opposed to the wind And a driving unit that rotates the wing unit to reduce an area of the wing unit facing the wind. delete delete The method according to claim 1,
The wing portion is formed so that a trailing edge is relatively rotatable with respect to a leading edge,
The driving unit includes:
And when the tower is moved in a direction opposite to the wind, the leading edge of the wing portion is rotated to increase an area facing the wind, and the trailing edge of the wing portion is rotated relative to the leading edge When the tower is moved in a direction opposite to the direction in which the wind is opposed to the wind, the leading edge of the wing portion is rotated to reduce the area facing the wind, A wind turbine generator that rotates the trailing edge of the beam relative to the leading edge in parallel. The method according to claim 1,
And a sensing unit installed in at least one of the nacelle and the tower to sense a vibration direction of the tower.

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