TWI722445B - Wind power generation system - Google Patents

Abstract

The present invention relates to a wind power generation system including a nacelle assembly, a first set of blades and a second set of blades. The first set of blades is connected to the nacelle assembly and includes multiple first blades. The second set of blades is connected to the nacelle assembly and includes multiple second blades. The first and the second set of blades are axially and oppositely disposed with respect to the nacelle assembly. The radius of gyration of the first set of blades is less than that of the second set of blades.

Description

Wind power system

The invention relates to a power generation system, in particular to a wind power generation system.

As the economy develops, energy shortages are occurring everywhere. Due to the safety concerns of nuclear power generation and the disposal of nuclear energy waste, while traditional thermal power generation has the disadvantage of generating air hazards, it is urgent to develop a clean and safe renewable energy power generation system. Renewable energy includes solar power, wind power and ocean current power generation. Regarding the part of wind power generation, since the source of wind power is the most abundant source of wind on the sea surface, wind power generation is suitable for areas with long coastlines because it can reduce the cost of obtaining wind sources.

To put it simply, a wind power generation system generally includes a wind turbine (wind turbine for short), which mainly generates electricity by rotating blades by air flow (ie, wind). The rotor is one of the most important systems for the conversion and utilization of wind energy in a wind turbine, and its blades are locked on a hub to jointly form an impeller. The blades are rotated around the axis by the aerodynamic action (including lift and resistance) of the wind, and the kinetic energy of the wind is collected to rotate the rotor in the hub, and through the electromagnetic conversion action of the rotor and the stator in the hub, it is converted into useful electrical energy and stored .

In order to increase the efficiency of receiving wind, the industry tends to increase the length of the blades to increase the wind surface so as to capture more wind. With current technology, the radius of rotation of the blade It may reach a hundred meters or even longer. However, the blade generally has a supporting portion and a wind-receiving portion, and the supporting portion is located at the inner end edge of the blade to support the wind-receiving portion with a wind-receiving surface. However, when the blade grows, the length of the support portion also increases. Since the supporting part has no wind-receiving surface, it cannot be driven by the wind to rotate the blades, thereby making it impossible to make full use of wind resources.

Therefore, it is possible to provide a wind power generation system that can solve the problem that the support part of the blade of the wind power generation system cannot receive the wind and cannot use the wind blowing to the position of the support part, thereby increasing the power generation efficiency. This is a problem that the industry wants to solve .

The reason is that in order to solve the above-mentioned problems, one of the objectives of the present invention is to provide a wind power generation system, which improves its power generation efficiency by arranging two sets of blades with different rotation radii. An embodiment of the present invention provides a wind power generation system, which includes a nacelle assembly, a first fan blade group, and a second fan blade group. The first fan blade group is connected to the nacelle assembly, and the first fan blade group includes a plurality of first blades. The second fan blade group is connected to the nacelle assembly, and the second fan blade group includes a plurality of second blades. The first fan blade group and the second fan blade group are axially opposite to the nacelle assembly, and the rotation radius of the first fan blade group is smaller than the rotation radius of the second fan blade group.

1: Wind power generation system

2: Tower body

3: Cabin assembly

4: The first fan blade group

5: The second fan blade group

31: Part One

32: Part Two

33: The first shaft

34: The first generator

35: second shaft

36: second generator

37: Operation and maintenance space

38: middle section

41: The first blade

42: first round valley

51: second blade

52: Second round valley

53: Support

54: Wind Receiving Department

56: The Wind Side

A: Axial direction

A1, A2: axis

D1: width

L1, L2, L3: length

L4, L5: axial length

Fig. 1 is a three-dimensional schematic diagram of a wind power generation system according to an embodiment of the present invention.

Fig. 2 is a schematic side view of the wind power generation system of Fig. 1.

Fig. 3 is a partial side perspective schematic diagram of the wind power generation system of Fig. 1.

In order to have a clearer understanding of the features, content and advantages of this creation and its achievable effects, this creation is described in detail with the accompanying drawings and in the form of embodiment expressions as follows. The main purpose of the diagrams used is only for illustration and auxiliary description. Therefore, the proportion and configuration relationship of the attached diagrams should not be interpreted or limited to the scope of patent application for this creation.

Please refer to FIGS. 1 and 2. FIG. 1 is a three-dimensional schematic diagram of a wind power generation system 1 according to an embodiment of the present invention, and FIG. 2 is a side schematic diagram of the wind power generation system 1 of FIG. In this embodiment, an embodiment of the present invention provides a wind power generation system 1, which can be installed on land or at sea. The wind power generation system 1 includes a tower body 2, a nacelle assembly 3, a first fan blade group 4 and a second fan blade group 5. The nacelle assembly 3 is arranged on the top of the tower 2.

The tower body 2 can be installed on land or in water. When installed on land, it is a general land-based wind power generation system 1; when installed in the water as an offshore wind power generation system 1, the tower body 2 can be installed on a floating platform or at the bottom of the tower body 2. The end can be connected to a foundation on the seabed, such as a gravity base, a monopile, a jacket, a tripod, or a suction bucket. The tower 2 is used as the overall support of the wind power generation system 1, and there are other circuit equipment and lines inside the tower 2 to transmit the electric energy generated by the wind power generation system 1 to a specific substation.

Fig. 3 is a partial side perspective schematic diagram of the wind power generation system 1 of Fig. 1. As shown in FIG. 3, the nacelle assembly 3 is based on the axial direction of the tower body 2 and is divided into a first part 31 and a second part 32 respectively located on both sides of the middle section 38 connecting the tower body 2. That is, the first portion 31 is defined on the left side of FIG. 3, and the second portion 32 is defined on the right side of FIG. 3. The first fan blade group 4 is connected to the first part 31 of the nacelle assembly 3 in a rotatable manner, and the second fan blade group 5 is connected to the second part 32 of the nacelle assembly 3 in a rotatable manner.

Please refer to FIG. 1, regarding the first fan blade group 4 of this embodiment, it is connected to the end edge of the first part 31 of the nacelle assembly 3 and includes a plurality of first blades 41 and a first wheel valley 42. In this embodiment, as shown in FIG. 1, the number of the first blades 41 is three, but the number is not limited. Determine the present invention. The inner edge of the first blade 41 is connected to the first wheel valley 42, and the first blade 41 is used to receive the driving of the external wind to rotate therewith, and drive the first wheel valley 42 to rotate.

Regarding the second fan blade group 5 of this embodiment, it is connected to the end edge of the second part 32 of the nacelle assembly 3 and includes a plurality of second blades 51 and a second wheel valley 52. In this embodiment, as shown in FIG. 1, the number of the second blades 51 is three, but the number is not intended to limit the present invention. In more detail, each of the second blades 51 includes a supporting portion 53 and a wind-receiving portion 54. The supporting portion 53 is located between the wind receiving portion 54 and the second wheel valley 52, and the supporting portion 53 is used to support the wind receiving portion 54 instead of capturing wind power for rotation. The wind receiving portion 54 has a wind receiving surface 56 which extends laterally to receive the driving of the external wind to rotate and drive the second wheel valley 52 to rotate. The width of the wind receiving portion 54 can be tapered from the supporting portion 53 toward a direction away from the supporting portion 53. That is, as shown in FIG. 2, the width D1 of the wind-receiving portion 54 adjacent to the supporting portion 53 may be the maximum value, and gradually decrease toward the distal end. In this embodiment, the boundary between the supporting portion 53 and the wind receiving portion 54 is where the width D1 of the wind receiving portion 54 is at its maximum. However, the boundary between the supporting portion 53 and the wind receiving portion 54 of the present invention is not intended to limit this invention. In the embodiment of the present invention, since the supporting portion 53 is mainly used to support the wind-receiving portion 54, and the wind-receiving portion 54 is mainly used to capture wind and rotate, in other embodiments, any supporting portion that meets the aforementioned definition 53 and the wind-receiving portion 54, regardless of their shape, can serve as the supporting portion 53 and the wind-receiving portion 54 of the present invention, and can define the junction of the two.

In addition, as shown in FIGS. 1 and 3, the first blade 41 and the second blade 51 respectively have an angle adjustment mechanism to allow the first blade 41 and the second blade 51 to rotate in situ along their axis A1, A2 to The direction of the windward side is adjusted, and when the wind direction changes, the wind capture amount of the first blade 41 and the second blade 51 is increased.

As shown in FIG. 1, in this embodiment, the first blade 41 of the first blade group 4 corresponds to the supporting portion 53 in the axial direction (represented by the axis A). The aforementioned "correspondence" refers to the first blade The area covered by the rotation of 41 can be projected to the supporting portion 53 of the second blade 51 in the axial direction, and at least a substantial part of the supporting portion 53 is covered. In this embodiment, the length L1 of the first blade 41 (that is, the distance from the distal end of the first blade 411 to the axis A1) is substantially equal to the length L2 of the support portion 53 of the second blade 51 (that is, from the second blade The distance from the distal end of the supporting portion 53 of 51 to the axis A2). In addition, as shown in FIGS. 1 and 3, the axis A1 of the first fan blade group 4 and the axis A2 of the second fan blade group 5 coincide with an axis A, and the axis A is orthogonal to the first blade 41. And second blade 51. As shown in Figure 1, in this embodiment, the length L1 of the first blade 41 (that is, the distance from the distal end of the first blade 411 to the axis A1) and the length L2+L3 of the second blade 51 (that is, from the first blade 411) The ratio of the distance between the distal end of the two blades 51 and the axis A2) ranges from 1:3 to 1:6. That is to say, when the wind power generation system 11 receives wind and operates, the radius of rotation of the first blade 41 (that is, the length L1 of the first blade 41) roughly covers the radius of rotation of the support portion 53 of the second blade 51 (that is, the second blade The length of 51 is L2+L3). In this way, when the wind blows from the left side to the right side as shown in FIG. 2, since the first blade 41 rotates and covers the area of the support portion 53 of the second blade 51 that cannot receive the wind to rotate, the first blade 41 receives this area. The wind power increases the wind extraction capacity of the overall wind power generation system 1 without increasing the length of the second blade 51.

In this embodiment, as shown in FIG. 3, the nacelle assembly 3 includes a first rotating shaft 33, a plurality of first generators 34, a second rotating shaft 35 and a plurality of second generators 36. The number of the first generator 34 and the number of the second generator 36 in this embodiment are both three, but the number is not intended to limit the present invention. In other embodiments, the number of the first generator 34 and the second generator 36 may be one, two, or four or more. In this embodiment, the first rotating shaft 33 and the first generator 34 are located in the first part 31, and the second rotating shaft 35 and the second generator 36 are located in the second part 32. The first wheel valley 42 is rotatably coupled to the first rotating shaft 33 of the nacelle assembly 3. The first rotating shaft 33 sequentially passes through a plurality of first generators 34 so that the first wheel valley 42 is coupled to the plurality of first generators 34 The first generator 34, The first rotating shaft 33 is configured to be driven by the first fan blade group 4 to rotate. On the other hand, the inner end edge of the supporting portion 53 of the second blade 51 is connected to the second wheel valley 52, and the second wheel valley 52 of the second fan blade group 5 is rotatably coupled to the second shaft of the nacelle assembly 3 35. The second rotating shaft 35 passes through a plurality of second generators 36 in sequence, so that the second wheel valley 52 is coupled to the plurality of second generators 36, wherein the second rotating shaft 35 is configured to receive the second fan blade group 5 It drives and rotates. It should be noted that in this embodiment, the first rotating shaft 33 and the second rotating shaft 35 are separated from each other, and the first rotating shaft 33 and the second rotating shaft 35 do not rotate synchronously. Therefore, the plurality of first generators 34 and the plurality of second rotating shafts The generators 36 are operated independently of each other.

On the other hand, the first generator 34 and the second generator 36 may be permanent magnet type or gear type generators. The first generator 34 and the second generator 36 may include a rotor and a stator, respectively. When the rotor rotates along the stator, according to the principle of electromagnetic induction, mechanical energy is converted into electrical energy through the relative movement of the magnetic field of the rotor and the winding of the stator. In addition, as shown in Fig. 3, the nacelle assembly 3 may also have at least one operation and maintenance space 37 for operators or maintenance personnel to perform operations and to place equipment or tools. Moreover, since the weight of the second fan blade group 5 is significantly greater than the weight of the first fan blade group 4, the axial length L4 of the first part 31 can be greater than the axial length L5 of the second part 32 to effectively achieve the wind power generation system 1 The structure is balanced.

Generally, as shown in FIGS. 2 and 3, the first blade 41 is designed to receive the main wind source (indicated by the arrow) first, so its position is configured to capture the wind earlier than the second fan blade group 5. When the first blade 41 is rotated by the wind, the first blade 41 drives the first wheel valley 42 to rotate, which in turn drives the rotor of the first generator 34 shown in FIG. 3 to rotate, so that the first blade 41 is generated by the wind. The mechanical energy is converted into electrical energy through the action of the plurality of first generators 34. At the same time, the second blade 51 rotates by capturing the wind force by the wind receiving part 54, and the second blade 51 drives the second wheel valley 52 to rotate, thereby driving the rotor of the second generator 36 to rotate, so that the second blade 51 is affected by the wind. The generated mechanical energy is converted into electrical energy through the action of a plurality of second generators 36. So, the wind power system 1 It is possible to simultaneously capture the wind force by the first fan blade group 4 and the second fan blade group 5 arranged in parallel in the axial direction.

To sum up, according to the wind power generation system disclosed in an embodiment of the present invention, since the rotation diameter of the first fan blade group is smaller than the rotation diameter of the second fan blade group, the first fan blade group captures the second fan blade group The wind that cannot be captured in the middle improves the overall wind harvesting efficiency, thereby increasing the total power generation of the wind power system.

In some embodiments, the nacelle assembly of the wind power generation system may be provided with a plurality of first generators connected to the first fan blade group and a plurality of second generators connected to the second fan blade group. When the wheel valley and the second wheel valley rotate, multiple first generators and multiple second generators can be driven to generate electricity at the same time, thereby effectively improving the power generation efficiency of the wind power generation system.

The term "one" or "one" in this article is used to describe the elements and components of this creation. This term is only for the convenience of description and to give the basic idea of this creation. This description should be understood to include one or at least one, and unless clearly indicated otherwise, the singular number also includes the plural number. When used with the word "include" in the scope of patent application, the term "one" can mean one or more than one. In addition, the term "or" in this article means the same as "and/or".

Unless otherwise specified, such as "above", "below", "up", "left", "right", "down", "body", "base", "vertical", "horizontal", "side" , "Higher", "Lower", "Upper", "Above", "Below" and other space descriptions refer to the directions shown in the figure. It should be understood that the spatial description used herein is only for illustrative purposes, and the actual implementation of the structure described herein can be spatially arranged in any relative direction, and this restriction will not change the advantages of the embodiments of the present invention. For example, in the description of some embodiments, providing an element "on" another element may cover the situation where the previous element is directly on the next element (for example, physically contacting the next element) and a Or a situation where a plurality of intervening elements are located between the previous element and the next element.

As used herein, the terms "approximately", "substantial", "substantial" and "about" are used to describe and consider minor changes. When used in conjunction with an event or situation, these terms can mean a situation in which the event or situation clearly occurred and the event or situation closely resembled the situation in which it occurred.

The above-mentioned embodiments are only to illustrate the technical ideas and characteristics of this creation, and their purpose is to enable those who are familiar with the art to understand the content of this creation and implement them accordingly. When they cannot be used to limit the patent scope of this creation, Equal changes or modifications made in accordance with the spirit of this creation should still be covered by the scope of the patent of this creation.

1: Wind power generation system

2: Tower body

3: Cabin assembly

4: The first fan blade group

41: The first blade

42: first round valley

5: The second fan blade group

51: second blade

52: Second round valley

53: Support

54: Wind Receiving Department

56: The Wind Side

A: Axial direction

A1, A2: axis

L1, L2, L3: length

Claims (6)

A wind power generation system includes: a nacelle assembly; a first fan blade group connected to the nacelle assembly and including a plurality of first blades; and a second fan blade group connected to the nacelle assembly, And includes a plurality of second blades; wherein the first fan blade group and the second fan blade group are axially opposite to the nacelle assembly, and the radius of rotation of the first fan blade group is smaller than the second fan blade The radius of rotation of the group, wherein each of the second blades includes a supporting part and a wind-receiving part, the supporting part is between the wind-receiving part and the nacelle assembly, and is used to support the wind-receiving part, Wherein the width of the wind receiving portion is tapered from the support portion to a direction away from the support portion; wherein the first blade corresponds to the support portion of the second blade in the axial direction, and the length of the first blade It is equal to the length of the supporting portion of the second blade, and the ratio of the length of the first blades to the length of the second blades ranges from 1:3 to 1:6. For example, the wind power generation system of claim 1, further comprising a tower body, the nacelle assembly is arranged on the tower body, wherein the nacelle assembly is divided into a first part and a second part by the tower body, and the first fan The blade group is located at the end edge of the first part, and the second fan blade group is located at the end edge of the second part. For example, the wind power generation system of claim 1, wherein the nacelle assembly further includes: a first rotating shaft connected to the first fan blade group and used to be driven by the first fan blade group to rotate; a plurality of first generators , Connect the first shaft in sequence; A second rotating shaft, connected to the second fan blade set, and used to be driven by the second fan blade set to rotate; a plurality of second generators are sequentially connected to the second rotating shaft; wherein the plurality of first generators It operates independently of the plurality of second generators. Such as the wind power generation system of claim 3, wherein the first rotating shaft and the second rotating shaft are separated from each other. For example, the wind power generation system of claim 3, wherein the first fan blade group includes a first wheel valley connecting the first blades and the first rotating shaft, and the second fan blade group includes a second wheel valley, It connects the second blades and the second rotating shaft. Such as the wind power generation system of claim 1, wherein the axis of the first fan blade group and the axis of the second fan blade group coincide with an axis, and the axis is orthogonal to the first blades and the The second blade.

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