KR20190098498A - Multi type wind turbine - Google Patents

Abstract

The present invention relates to a multi-type wind turbine having a plurality of unit power generation units in one tower. According to an embodiment of the present invention, a multi-type wind turbine comprises: a tower; a main nacelle installed in an upper end of the tower; a plurality of support arms installed in the main nacelle; and a plurality of unit power generation units installed in an end portion of the support arms. An electricity generation unit producing electricity by using a wind is arranged in each of the unit power generation units, and an electricity delivery unit delivering electricity generated in the electricity generation unit to the outside is separately arranged in the main nacelle.

Description

Multi-type Wind Generators {MULTI TYPE WIND TURBINE}

The present invention relates to a wind generator, and more particularly to a multi-type wind generator having a plurality of unit power generation units in one tower.

Wind power generation refers to a power generation method in which wind energy is converted into mechanical energy (rotary power) using a windmill, and the mechanical energy is converted into electrical energy by driving a generator to obtain electric power.

Wind power generation is not only the most economical among the renewable energy sources developed so far, but also has been actively invested not only in Europe but also in the Americas and Asia due to the advantages of being able to generate power using the wind, which is an unlimited clean energy source for the wind. to be.

Wind generators for such wind power generation may be divided into a vertical axis wind generator and a horizontal axis wind generator according to the direction of the rotation axis. Until now, the horizontal axis wind generators are more efficient and stable than the vertical axis, so most of the commercial wind farms are applied with the horizontal axis wind generators.

Conventional horizontal axis wind turbines need to be equipped with a generator having a capacity corresponding to the size of the blade or to increase the size of the blade to obtain a lot of power. However, as the blade becomes bigger or the capacity of the generator increases, the weight of the blade and generator increases, so that the tower and the structure supporting the heavy blade and the generator must grow in size, and the weight of the power generation facility including the blade and the generator becomes heavy. Parts, such as bearings for supporting the bearings, must be increased, and a special device is to be installed for the yaw movement which turns the direction of the rotor blade according to the wind direction.

As a result, installation and maintenance costs increase exponentially, and this technical difficulty and increase in cost have a problem that causes a huge obstacle to widespread deployment of wind power generators.

Recently, a multi-type wind generator is known which arranges a plurality of unit power generation units along a circumferential direction around one tower. The multi-type wind generator is provided with one main nacelle in one tower, radially couples a plurality of support arms to the main nacelle, and installs a unit power generation unit in each support arm. The unit power generation unit includes a sub nacelle including a generator, a rotor rotatably coupled to the sub nacelle, and a small blade coupled to the rotor and rotating together.

International Publication WO2016 / 128005A1

An object of the present invention is to provide a multi-type wind power generator that can reduce the manufacturing cost, reduce the overall weight, and can improve the durability of the tower by reducing the load on the tower.

The multi-type wind power generator according to the embodiment of the present invention includes a tower, a main nacelle installed at an upper end of the tower, a plurality of support arms provided at the main nacelle, and a plurality of unit power generation units provided at ends of the support arms. In each of the plurality of unit power generation units, a power generation unit for generating power using wind is disposed, and a power transmission unit for distributing power generated by the power generation unit to the main nacelle is disposed separately.

In the multi-type wind power generator according to the embodiment of the present invention, the power generation unit disposed in each of the plurality of unit power generation units, the main shaft rotated by the rotor, a generator for producing AC power using the rotation of the main shaft, and the generator It may include an AC / DC converter for converting the AC power generated in the DC power.

In the multi-type wind power generator according to the embodiment of the present invention, the power generation unit may further include a speed increaser for converting the rotation speed of the main shaft into a rotation speed suitable for power generation.

In the multi-type wind power generator according to the embodiment of the present invention, the power generation unit may further include a brake disposed at a position adjacent to the speed increaser to control the rotational force of the main shaft.

In the multi-type wind power generator according to the embodiment of the present invention, the power transmitter converts the DC power converted by the AC / DC converter into AC power, and sets each AC / DC converter and one set arranged in the plurality of unit power generation units. It may further comprise a plurality of DC / AC converter to form.

In the multi-type wind power generator according to the embodiment of the present invention, the power transmitting unit may further include an integrated transformer for converting the AC power converted by the plurality of DC / AC converter into AC power for external transmission.

In the multi-type wind power generator according to the embodiment of the present invention, a yawing system for rotating the main nacelle is disposed inside the main nacelle so that the blades of the unit generating unit face the wind, and a yawing system is formed in the sub nacelle constituting the unit generating unit. It may not be.

In the multi-type wind power generator according to the embodiment of the present invention, the support arm may be provided with a staircase or a conveyor for maintenance of the unit power generation unit.

In the multi-type wind power generator according to the embodiment of the present invention, the plurality of support arms installed in the main nacelle may have the same number of support arms on the left and right sides of the tower when the main nacelle is viewed from the front. .

In the multi-type wind power generator according to the embodiment of the present invention, inside each sub nacelle constituting a plurality of unit power generation units, a main shaft rotated by a rotor and a rotation speed of the main shaft are converted into a rotation speed suitable for power generation. A speed reducer, a brake for controlling the rotational force of the main shaft, a generator for producing AC power by using the rotation of the main shaft, and an AC / DC converter for converting AC power generated by the generator into DC power are disposed. Further, inside the main nacelle, a plurality of DCs forming a set with a yawing system for rotating the main nacelle so that the blades of the plurality of unit power generation units face the wind, and each AC / DC converter disposed in the plurality of unit power generation units A / AC converter, an integrated transformer that integrates AC power converted from a plurality of DC / AC converters and converts the power into AC power for external transmission, and a control cabinet for controlling the overall operation of the multi-type wind generator may be disposed.

According to the multi-type wind generator as described above, the manufacturing cost can be reduced, the overall weight can be reduced, and the durability of the tower can be improved by reducing the load on the tower.

1 is a perspective view showing a multi-type wind power generator according to an embodiment of the present invention.
FIG. 2 is a view schematically illustrating the inside of the main nacelle of FIG. 1.
3 is a view illustrating the inside of the unit power generation unit of FIG. 1.
4 is a view schematically showing the internal structure of the sub nacelle and the main nacelle in the multi-type wind generator according to an embodiment of the present invention.
5 is a view schematically showing the internal structure of the sub nacelle and the main nacelle in the multi-type wind generator according to the prior art.
6 is a diagram illustrating a cable installed between a main nacelle and a sub nacelle in a multi-type wind power generator according to the prior art.
7 is a diagram illustrating a cable installed between a main nacelle and a sub nacelle in a multi-type wind generator according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, the terms 'comprise' or 'have' are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, the same components in the accompanying drawings are to be noted that the same reference numerals as possible. In addition, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted. For the same reason, in the accompanying drawings, some components are exaggerated, omitted or schematically illustrated.

Hereinafter, a multi-type wind power generator according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a perspective view showing a multi-type wind power generator according to an embodiment of the present invention, Figure 2 is a view schematically showing the inside of the main nacelle of Figure 1, Figure 3 is a view showing the interior of the unit power generation unit of Figure 1 4 is a view schematically illustrating the internal structure of a sub nacelle and a main nacelle in a multi-type wind generator according to an embodiment of the present invention.

1 to 4, the multi-type wind power generator according to the present embodiment includes a tower 100, a main nacelle 300, a plurality of support arms 500, and a plurality of unit power generation units 700. In the multi-type wind power generator according to the present embodiment, a plurality of unit power generation units 700 for separately producing electricity by the rotation of the rotor 710 are disposed, and each of the plurality of unit power generation units 700 includes a support arm 500. It can be fixedly coupled to the main nacelle (300) through.

The tower 100 is installed at a predetermined height from the ground, and may support the main nacelle 300, the plurality of unit power generation units 700, and the like. The tower 100 may have a tubular shape in which the diameter increases from the top to the bottom. In this case, the tower 100 may be formed in a multi-stage form in which a plurality of tubular members are stacked. On the other hand, the tower 100 may be installed in the staircase, conveyor or elevator for transporting the worker or work tool for maintenance of the unit power generation unit 700.

Main nacelle (300) is located on top of the tower 100 may be rotatably coupled to the tower (100). A plurality of support arms 500 may be radially coupled to the main nacelle 300, and a unit power generation unit 700 may be coupled to an end of each of the plurality of support arms 500. That is, when the main nacelle 300 rotates with respect to the tower 100, the plurality of unit power generation units 700 may also rotate together with the main nacelle 300.

The support arm 500 is a member connecting the main nacelle 300 and the unit power generation unit 700 to each other. The support arm 500 may have a tubular shape having a smaller diameter or a uniform diameter as it moves away from the main nacelle 300. In this case, the support arm 500 may be provided with a staircase or a conveyor for maintenance of the unit power generation unit 700.

Meanwhile, a plurality of support arms 500 are coupled to the main nacelle 300. When the main nacelle 300 is viewed from the front, the same number of supports are provided on the left and right sides of the tower 100 based on the tower 100. Arm 500 is disposed. For example, as shown in FIG. 1, two support arms 500 are disposed on the left side of the tower 100, and two support arms 500 are disposed on the right side of the tower 100.

In this embodiment, some of the components disposed in the conventional sub nacelle 730 are distributed to the main nacelle 300 to reduce the weight of the unit power generation unit 700. To this end, as shown in FIG. 2, the yawing system 200 and the power transmission units 350 (310, 320) are disposed inside the main nacelle 300.

At this time, a separate yawing system is not formed in the sub nacelle 730 constituting each unit power generation unit 700. When the main nacelle 300 rotates with respect to the tower 100, the plurality of unit power generation units 700 may also rotate together with the main nacelle 300. That is, the plurality of unit power generation units 700 can be collectively rotated by one yawing system 200.

The main nacelle 300 is formed in a shape similar to that of a conventional nacelle only, and does not include a gear box or a generator. The shape of the main nacelle 300 is not necessarily limited thereto, and may be formed in a cylindrical shape.

Referring back to FIG. 2, a yawing system 200 is disposed inside the main nacelle 300 so that the unit power generation unit 700 is coupled so that the blade 711 of the unit power generation unit 700 faces the wind. The main nacelle 300 can be rotated. The yawing system 200 may include a yaw bearing (not shown), a yaw drive motor 210, a pinion gear 230 and a tooth 250.

The tower 100 and the main nacelle 300 are connected to each other via a yaw bearing (not shown), and the main nacelle 300 is rotated with respect to the tower 100 fixedly installed on the ground by the yaw bearing (not shown). In other words, you can do yawing exercise. The yaw bearing (not shown) has an outer ring and an inner ring, the outer ring of the yaw bearing (not shown) may be fixed to the tower 100, the inner ring of the yaw bearing (not shown) may be fixed to the main nacelle (300). . However, the present invention is not limited thereto, and the outer ring of the yaw bearing may be fixed to the main nacelle 300, and the inner ring of the yaw bearing may be fixed to the tower 100.

The yaw drive motor 210 may be fixedly coupled to one side of the main nacelle 300, and the pinion gear 230 may be coupled to the lower end of the yaw drive motor 210. Meanwhile, teeth 250 are formed on the outer circumferential surface of the tower 100 in which the outer ring of the yaw bearing (not shown) is fixed, and the pinion gear 230 of the yaw drive motor 210 may be geared to the teeth 250. have. However, the present invention is not limited thereto, and the teeth may be formed on the outer ring or the inner ring of the yaw bearing, and the pinion gear may be directly connected to the yaw bearing.

At this time, the pinion gear 230 is rotated in accordance with the drive of the yaw drive motor 210, the pinion gear 230 is rotated along the teeth (250). Therefore, when the yaw drive motor 210 rotates, the main nacelle 300 to which the yaw drive motor 210 is coupled is to yaw on the tower 100.

The power transmitter 350 will be described later.

Referring to FIG. 3, the unit power generation unit 700 coupled to the end of the support arm 500 generates electricity using wind, and includes a rotor 710, a sub nacelle 730, and a main shaft ( 740, gearbox 750, brake 760, generator 770, AC / DC converter 780. Here, the rotor 710, the main shaft 740, the generator 770, and the AC / DC converter 780 constitute a power generator. The power generation unit may further include an increaser 750, a brake 760, and the like.

The rotor 710 is rotatably installed in front of the sub nacelle 730, and the rotational force generated from the rotor 710 is transmitted to the speed increaser 750 through the main shaft 740. The rotor 710 is composed of a hub 713 and a plurality of blades 711, the hub 713 is coupled to one end of the main shaft 740 is rotatably installed on the front of the sub nacelle 730. The plurality of blades 711 are coupled to the outer circumferential surface of the hub 713 at predetermined intervals along the circumferential direction.

Hub 713 may be conical, protruding forward convex to reduce wind resistance. The blade 711 rotates about the central axis of the hub 713 by the wind. The blade 711 has a streamlined cross section in the width direction, and a space portion may be formed therein.

The sub nacelle 730 is a housing that accommodates the speed increaser 750, the generator 770, the AC / DC converter 780, and the like, and may be formed in a hexahedral shape. However, the shape of the sub nacelle 730 is not necessarily limited thereto, and may be formed in a cylindrical shape or the like.

The main shaft 740 transmits the rotational force of the rotor 710 to the speed increaser 750. The main shaft 740 that rotates at high speed is rotatably supported by a main bearing (not shown).

The speed increaser 750 is a device that converts the rotational speed of the main shaft 740 rotated by the blade 711 by the gear to a rotational speed suitable for power generation. The speed increaser 750 includes a plurality of gears. A speed increase gear part (not shown) is provided. On the other hand, for lubrication and cooling of a plurality of gears in the speed increase gear part, the speed increaser oil (not shown) may be provided in the speed increaser 750.

The brake 760 may be disposed at a position adjacent to the speed increaser 750 to control the rotational force of the main shaft 740. In this case, the brake 760 may be mainly used a disk method.

Generator 770 is a device for producing electricity (AC power) using the input rotation energy, there is provided a rotor (not shown) and a stator (not shown) fixed to the rotating shaft therein. The rotor rotates around the stator at high speed to generate electricity.

The AC / DC converter 780 converts AC power generated by the generator 770 into DC power.

Meanwhile, the main nacelle 300 is provided with a power transmitter 350 for transmitting the power generated by the power generator to the outside. Referring to FIG. 4, the power transmitter 350 includes a plurality of DC / AC converters 310 (311 ˜ 314) and an integrated transformer 320 disposed inside the main nacelle 300.

The plurality of DC / AC converters 310 converts the DC power converted by the AC / DC converter 780 respectively disposed in the sub nacelle 730 into AC power. The plurality of DC / AC converters 310 forms a set with the AC / DC converters 780 respectively disposed in the sub nacelle 730. For example, in FIG. 1, the first AC / DC converter 780 disposed inside the sub nacelle 730 of the unit power generation unit 700 positioned at the upper left end and the first DC / disposed inside the main nacelle 300. The AC converter 311 constitutes a set and is disposed inside the main nacelle 300 and the second AC / DC converter 780 disposed inside the sub nacelle 730 of the unit power generation unit 700 positioned at the lower left. The second DC / AC converter 312 constitutes a set, and the third AC / DC converter 780 and the main nacelle 300 disposed inside the sub nacelle 730 of the unit power generation unit 700 located at the upper right end. The third DC / AC converter 313 disposed inside the third unit forms a set, and the fourth AC / DC converter 780 disposed in the sub nacelle 730 of the unit power generation unit 700 located at the lower right end thereof. And a fourth DC / AC converter 314 disposed inside the main nacelle 300. That is, the first to fourth AC / DC converters 780 are disposed in each sub nacelle 730, and the first to fourth DC / AC converters 310: 311 to 314 are all main nacelles 300. It is placed inside.

The integrated transformer 320 integrates AC power converted by the first to fourth DC / AC converters 310 and converts the AC power into AC power for external transmission. Also, Inside the main nacelle 300, a control cabinet 330 is disposed to control the overall operation of the multi-type wind generator.

Referring to FIG. 5, a typical wind generator converts AC to DC so as to operate at a maximum efficiency at a variable speed, and then converts DC to AC so that it can be consumed at a consumer and sends it to a grid. That is, power generation and power transmission are performed in one nacelle.

This power generation and transmission is equally applied to the multi-type wind power generator, each of the sub-nacelle 730 constituting each unit generating unit 700, as shown in Figure 5, a gearbox (gearbox), Generators, AC / DC converters, DC / AC converters and transformers are all provided.

As a result, the weight of the unit power generation unit 700 increases, and the support arm 500 fixedly coupled to the unit power generation unit 700, the main nacelle 300 fixedly coupled to the support arm, and the main nacelle 300 are coupled to each other. The large load is applied to the tower 100, etc., thereby reducing the durability of the multi-type wind generator as a whole.

Thus, in the present embodiment, as described above, only the component (power generator) for generating power is disposed in the unit power generation unit 700, and the power transmitter 350 for transmitting the generated power is separated from the main nacelle ( 300) placed inside.

That is, each of the AC / DC converter 780 and the DC / AC converter 310 forming a set were conventionally disposed together in one sub nacelle 730. Without modification / modification, the AC / DC converter 780 is disposed inside the sub nacelle, and the DC / AC converter 310 is disposed separately inside the main nacelle to reduce the weight of the unit power generation unit 700, and the main nacelle ( The weight of 300 is increased so that the center of gravity as a whole is coincident with the main nacelle 300.

Meanwhile, as in the embodiment of the present invention, when the AC / DC converter and the DC / AC converter, which are conventionally disposed inside one nacelle, are separately installed in two separate nacelles (main nacelle and sub nacelle), two nacelle The number of power cables required for power transmission in between can be dramatically reduced. That is, as shown in FIG. 6, before the AC / DC converter and the DC / AC converter are separated, for example, 30 stranded cables should be installed between the sub nacelle 730 and the main nacelle 300. As shown in FIG. 2, when the AC / DC converter and the DC / AC converter are separated according to the exemplary embodiment of the present invention, for example, two cables may be provided between the sub nacelle 730 and the main nacelle 300. .

As mentioned above, although an embodiment of the present invention has been described, those of ordinary skill in the art may add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. The present invention may be modified and changed in various ways, etc., which will also be included within the scope of the present invention.

As described above, the present invention has been described through limited embodiments and drawings, but the present invention is not limited thereto, and the present invention has been described below by the person skilled in the art to which the present invention pertains. Various modifications and variations are possible within the scope of the claims.

100: tower 200: yawing system
300: main nacelle 310: DC / AC converter
320: integrated transformer 500: support arm
700: unit power generation unit 730: sub nacelle
780: AC / DC Converter

Claims (10)

tower;
A main nacelle installed at the top of the tower;
A plurality of support arms installed on the main nacelle;
A plurality of unit power generation units installed at an end of the support arm,
Each of the plurality of unit power generation unit is a power generation unit for generating power using the wind is disposed, the multi-type wind generator is disposed separately in the main nacelle the power transmission unit for transmitting the power generated by the power generation unit to the outside.
The method of claim 1,
The power generation unit disposed in each of the plurality of unit power generation units,
The main shaft rotated by the rotor,
A generator for producing AC power using the rotation of the main shaft;
AC / DC converter converts AC power generated by the generator into DC power
Multi-type wind generator comprising a.
The power generation unit of claim 2, wherein the power generation unit comprises:
The multi-type wind generator further comprises a speed increaser for converting the rotational speed of the main shaft into a rotational speed suitable for power generation.
The method of claim 3, wherein the power generation unit,
And a brake disposed at a position adjacent to the speed increaser to control rotational force of the main shaft.
The method of claim 2, wherein the power transmission unit,
The multi-type wind power generator further converts the DC power converted by the AC / DC converter into AC power, and further includes a plurality of DC / AC converters in a set with each AC / DC converter disposed in the plurality of unit power generation units. .
The method of claim 5, wherein the power transmission unit,
The multi-type wind generator further comprises an integrated transformer for converting the AC power converted in the plurality of DC / AC converter to the AC power for external transmission.
The method of claim 1,
Inside the main nacelle is arranged a yawing system for rotating the main nacelle so that the blades of the unit generating unit facing the wind,
A multi-type wind generator in which no yawing system is formed in the sub nacelle constituting the unit power generation unit.
The method of claim 1,
Multi-type wind generator is installed inside the support arm for the maintenance of the unit power generation unit or a conveyor.
The method of claim 1,
The plurality of support arms installed in the main nacelle, the multi-type wind power generator is arranged on the left and right sides of the tower with the same number of support arms when the main nacelle facing the front.
The method of claim 1,
Inside each sub nacelle constituting the plurality of unit power generation units, a main shaft rotated by a rotor, a speed increaser for converting the rotation speed of the main shaft into a rotation speed suitable for power generation, and controlling the rotation force of the main shaft A brake, a generator for generating AC power by using the rotation of the main shaft, and an AC / DC converter for converting AC power generated by the generator into DC power,
Inside the main nacelle, a plurality of sets of yawing systems for rotating the main nacelle so that the blades of the plurality of unit power generation units face wind, and each AC / DC converter disposed in the plurality of unit power generation units Multi-wind power with integrated DC / AC converter, an integrated transformer for converting AC power converted from the plurality of DC / AC converters into AC power for external transmission, and a control cabinet for controlling the overall operation of the multi-wind generator. generator.

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