WO2020080759A1

WO2020080759A1 - Floating body for wave power generation and wave power generator using same

Info

Publication number: WO2020080759A1
Application number: PCT/KR2019/013405
Authority: WO
Inventors: 권효재
Original assignee: 주식회사 인진
Priority date: 2018-10-19
Filing date: 2019-10-14
Publication date: 2020-04-23
Also published as: KR102110734B1; KR20200044560A

Abstract

A floating body for wave power generation, according to one embodiment, may comprise: a body floating on the surface of the sea; a rotary shaft horizontally connected to the body; a blade rotatably connected to the rotary shaft; and a rotating part for rotating the blade about the rotary shaft.

Description

Floating body for wave power generation and wave power generation device including the same

The following embodiment relates to a floating body for wave power generation and a wave power generation device including the same.

The wave power generation device is a device that generates power using the energy of the waves. The wave power generation device is provided with a floating body floating on the sea level in order to capture the energy of the waves. In order to increase power generation efficiency, a structure capable of efficiently absorbing the energy of waves is required. To this end, there is a need for a floating body capable of controlling the degree to which the floating body is submerged in the sea surface according to the state of the wave and a wave power generating device including the floating body.

The above-described background art is possessed or acquired by the inventor during the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public prior to the filing of the present invention.

An object of an embodiment is to provide a floating body for wave power generation and a wave power generating device including the floating body capable of controlling the degree to which the floating body is submerged in the sea level according to the state of the wave.

An object of an embodiment is to provide a floating body for wave power generation capable of increasing the power production efficiency and a wave power generator including the same.

Floating body for wave power according to an embodiment, the body floating on the sea surface; A rotating shaft horizontally connected to the body; A blade rotatably connected to the rotating shaft; And it may include a rotating portion for rotating the blade around the rotation axis.

The cross section of the wing has a plurality of ends, the distance from the rotation axis to the plurality of ends may be formed differently.

The rotating part may rotate the wing about the rotation axis so that the degree to which the wing is submerged in the sea level is adjusted according to the state of the wave.

The rotating unit may rotate the wing so that the degree to which the wing is submerged in the sea level increases when the floating body rises by the waves.

The rotating part may rotate the wing so that the degree to which the wing is submerged in the sea level is reduced when the floating body descends by the waves.

When the end that is located farthest from the rotating shaft among the plurality of ends is called the longest end and the closest end is the shortest, the rotating part is such that the longest end is submerged in the sea level when the floating body rises by the waves. The wing can be rotated and the wing can be rotated so that the shortest end is submerged in the sea level when the floating body descends by the waves.

A plurality of the blades may be provided, and may be rotatable around the rotation axis.

At least one pair of wings among the plurality of wings may be connected to the rotating shaft so that the cross-sections are symmetrical with each other.

The rotating part may rotate at least one pair of wings among the plurality of wings in opposite directions about the rotation axis.

The wing may be formed in the longitudinal direction along the rotation axis.

The wave power generating apparatus according to an embodiment includes a body floating on the sea surface, a rotating shaft horizontally connected to the body, a blade rotatably connected to the rotating shaft, and a rotating portion rotating the blade about the rotating shaft Floating bodies; A power generation unit that generates electric power through the kinetic energy of the floating body; And a wire that transmits the kinetic energy of the floating body to the power generation unit.

The rotating part may rotate the wing about the rotation axis so that the degree to which the wing is submerged in the sea level is adjusted.

The cross section of the wing may be formed asymmetrically about the rotation axis.

A tension maintaining unit for maintaining the tension of the wire may be further included.

When the wire is pulled by the movement of the floating body according to the wave, the rotating part may rotate the wing so that the degree to which the wing is submerged in the sea level increases.

When the wire is pulled by the tension holding part, the rotating part may rotate the wing so that the degree to which the wing is submerged in the sea level decreases.

The wire includes three wires each of which is fixed on the seabed, and the floating body can be connected to the three wires at three points.

Further comprising a control unit for controlling the operation of the rotating unit, the control unit based on at least one or more of the wave direction, wave wave, wave speed, wave period and wave pattern, the operation of the rotating unit Can be controlled.

The floating body for wave power generation according to an embodiment and the wave power generating device including the same may control the degree to which the floating body is submerged in the sea surface according to the state of the wave.

A floating body for wave power generation and a wave power generation device including the same according to an embodiment may increase power production efficiency.

The effects of the floating body for wave power generation according to an embodiment and the wave power generating device including the same are not limited to those mentioned above, and other effects not mentioned may be clearly understood by a person skilled in the art from the following description. will be.

The following drawings attached to this specification are intended to illustrate one preferred embodiment of the present invention and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited to those described in those drawings. It should not be interpreted as limited.

1 is a plan view of a wave power generator according to an embodiment.

2 is a front view of a wave power generator according to an embodiment.

3 is a side view of a wave power generating apparatus according to an embodiment.

4 is a side view of a wave power generating apparatus according to an embodiment.

5 is a block diagram of a control unit and a rotating unit according to an embodiment.

6 is a block diagram of a wire, a tension holding unit, and a power generating unit according to an embodiment.

Hereinafter, embodiments will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the embodiments, when it is determined that detailed descriptions of related well-known configurations or functions interfere with understanding of the embodiments, detailed descriptions thereof will be omitted.

In addition, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to the other component, but another component between each component It should be understood that may be "connected", "coupled" or "connected".

Components included in any one embodiment and components including a common function will be described using the same name in other embodiments. Unless there is an objection to the contrary, the description described in any one embodiment may be applied to other embodiments, and a detailed description will be omitted in the overlapped range.

1 is a plan view of a wave power generator according to an embodiment. 2 is a front view of a wave power generator according to an embodiment. 3 is a side view of a wave power generating apparatus according to an embodiment. 4 is a side view of a wave power generating apparatus according to an embodiment. 5 is a block diagram of a control unit and a rotating unit according to an embodiment. 6 is a block diagram of a wire, a tension holding unit, and a power generating unit according to an embodiment.

1 to 6, the wave power generating apparatus 1 according to an embodiment may generate electric power from energy of a wave. The wave power generating device 1 can absorb the energy of the waves as the kinetic energy of the floating body 10. The kinetic energy of the floating body 10 may be transferred to the power generation unit 11 and converted into electrical energy. The wave power generating device 1 may adjust the degree to which the floating body 10 is submerged in the sea surface according to the state of the wave in order to increase the power production efficiency. According to this structure, the energy absorbed from the wave increases while the wave passes through the floating body, and the energy consumed can be decreased. That is, such a structure can increase the power production efficiency of the wave power generating device 1.

The wave power generating device 1 according to an embodiment may include a floating body 10, a power generation unit 11, a wire 12, a tension holding unit 13, and a control unit 14.

The floating body 10 may float on the sea level. The floating body 10 may float on the sea far from the coast or the sea near the coast. The floating body 10 can capture the energy of the waves. The floating body 10 can absorb the energy of the waves as kinetic energy. The floating body 10 can move in six degrees of freedom as the waves pass. 6 degrees of freedom may mean translational motion in the X, Y and Z axis directions and rotational motion around the X, Y and Z axes. In order to increase the amount of waves that the floating body 10 captures, the floating body 10 may be formed in the longitudinal direction. The degree to which the floating body 10 is submerged in the sea level may be adjusted according to the state of the waves.

The floating body 10 may include a body 101, a rotating shaft 102, a wing 103, an extension body 104, a roller 105, a ballast tank 106 and a rotating portion 107.

The body 101 may float on the sea level. The body 101 may be located at the center of the floating body 10. The body 101 may include an insertion portion (not shown) that is concavely formed inward along the circumference of the body 101 to be coupled with the wing 103. For example, the insertion portion may include a horizontal upper surface, a vertical side surface, and a downward slope.

The rotation shaft 102 may be a center of rotation of the wing 103. The rotating shaft 102 may be horizontally connected to the body 101. For example, the rotating shaft 102 may penetrate the body 101 horizontally. The rotating shaft 102 may be separately provided for each wing 103.

The wing 103 may be a bouy connected horizontally to the body 101 to increase the amount of waves captured by the floating body 10. The wing 103 may be rotatably connected to the rotating shaft 102. That is, the wing 103 may be rotatable about the rotation axis 102. Wing 103 may be formed in the longitudinal direction. For example, the wings 103 may be formed in the longitudinal direction along the rotation axis 102. A plurality of wings 103 may be provided. For example, the wing 103 may include a first wing 103a, a second wing 103b, a third wing 103c, and a fourth wing 103d. The plurality of wings 103 may be rotatable about each of the rotation axes 102. The plurality of wings 103 may be connected to both sides of the body 101. The plurality of wings 103 may be arranged on a straight line in the longitudinal direction. For example, the first wing 103a and the second wing 103b may be connected to one side of the body 101, and the third wing 103c and fourth wing 103d may be connected to the other side of the body 101. . Meanwhile, in FIG. 1 and FIG. 2, four wings 103 are illustrated, but as examples, the wings 103 may be provided in various numbers. 3 and 4, the cross section of the wing 103 may be formed asymmetrically about the rotation axis 102. For example, the cross section of the wing 103 may be formed in an asymmetric shape. Alternatively, the cross section of the wing 103 is formed in a symmetrical shape, and the rotating shaft 102 may be connected to be located at a position other than the center of the wing 103. The cross section of the wing 103 may have a plurality of ends 1031. Distances from the rotation shaft 102 to the plurality of ends 1031 may be formed differently. For example, the cross section of the wing 103 may include a first end 1031a, a second end 1031b, and a third end 1031c. Distances from the rotation shaft 102 to the first end 1031a, the second end 1031b, and the third end 1031c may be formed differently. For convenience of description, the end of the plurality of ends 1031 located farthest from the rotating shaft 102 may be referred to as the longest end portion 1031a and the closest end portion referred to as the shortest end portion 1031c. For example, based on FIGS. 3 and 4, the first end 1031a may be the longest end, and the third end 1031c may be the shortest. On the other hand, in Figures 3 and 4, the cross section of the wing 103 is shown as having three ends, which is exemplary, and the cross section of the wing 103 may be formed in various shapes.

The extension body 104 may be connected in the horizontal direction from the body 101. The extension body 104 may be formed in the longitudinal direction. The extension body 104 may be positioned below the wing 103. The extension 104 may be located below the sea level. Meanwhile, the extension body 104 may be disposed at the same height as the wing 103. A plurality of extension bodies 104 may be connected along the circumference of the body 101. For example, the extension body 104 may include a first extension body 104a, a second extension body 104b, and a third extension body 104c that are radially connected along the circumference of the body 101. The wings 103 may be disposed between two adjacent extensions 104 of the plurality of extensions 104.

The ballast tank 106 can improve the posture stability of the floating body 10. The ballast tank 106 may be located under the body 101. The ballast tank 106 may hold the center of gravity of the floating body 10 so that the floating body 10 can stably float. The ballast tank 106 can accommodate water therein. The ballast tank 106 may adjust the amount of water accommodated therein, depending on the situation, to control the height of the floating body 10 floating on the sea surface.

The rotating part 107 may rotate the wing 103 around the rotating shaft 102. The rotation unit 107 may rotate the wing 103 around the rotation axis 102 so that the degree of locking of the wing 103 on the sea level is adjusted according to the state of the waves on the sea level. Since the blade 103 is formed asymmetrically about the rotating shaft 102, when the rotating portion 107 rotates the blade 103 around the rotating shaft 102, the degree to which the blade 103 is submerged in the sea level Can be adjusted. The rotating part 107 may include, for example, a motor, a winch or a wire. The detailed description of the rotating part 107 will be described later.

The power generation unit 11 may generate electric power through the kinetic energy of the floating body 10. The power generation unit 11 may receive the kinetic energy of the floating body 10 through the wire 12 and convert the received kinetic energy into electrical energy. The power generation unit 11 may be disposed on the body 101. For example, the power generation unit 11 may be disposed on the top of the body 101.

The wire 12 may transfer kinetic energy of the floating body 10 to the power generation unit 11. The wire 12 is wound on a drum to convert linear kinetic energy into rotary kinetic energy. One side of the wire 12 may be fixed on the seabed. The other side of the wire 12 can be connected to the floating body 10 by being connected to the drum. The wire 12 may be fixed on the seabed via the extension body 104. The wire 12 may be connected to the roller 105 disposed on the extension body 104 or the body 101. A plurality of rollers 105 may be provided. The roller 105 can set the path of the wire 12. For example, the wire 12 may have a path bent by the roller 105. According to such a structure, the path of the wire 12 can be set so that the path of the wire 12 does not interfere with other components. The roller 105 may be connected to the extension body 104 or the body 101 by a ball joint in order to improve the path freedom of the wire 12. The wire 12 may include three wires 12 that are respectively fixed on the seabed. The floating body 10 can be connected to three wires 12 and three different points. According to such a structure, the kinetic energy of the floating body 10 moving at six degrees of freedom by waves can be transmitted to the power generation unit 11 through three wires 12. Meanwhile, the power generation unit 11 may be arranged on the land. In this case, one side of the wire 12 may be connected to the floating body 10, and the other side may be connected to the power generation unit 11 via the seabed.

The tension holding unit 13 can maintain the tension of the wire 12. If the floating body 10 does not pull the wire 12 while moving, the wire 12 cannot transmit energy to the power generation unit 11 because tension cannot be maintained in the wire 12. That is, when the wire 12 moves in one direction according to the movement of the floating body 10, the wire 12 is pulled to transfer energy to the power generation unit 11, and when the wire 12 moves in the other direction, the wire ( As 12) is relaxed, energy cannot be transmitted to the power generation unit 11. Therefore, when the tension according to the movement of the floating body 10 is not applied to the wire 12, the tension holding unit 13 may pull the wire 12 so that the tension of the wire 12 is maintained. For example, when the floating body 10 descends by a wave, the tension holding unit 13 may pull the wire 12 so that the tension is maintained on the wire 12. While pulling the wire 12 from the tension holding unit 13, electric power may be produced in the power generating unit 11. The tension holding unit 13 may include, for example, a hydraulic motor, a hydraulic pump, a hydraulic cylinder, an electric motor, a gas spring, a mechanical spring, and a fly wheel.

Hereinafter, with reference to FIGS. 3 and 4, the rotation of the blade 103 according to the operation of the rotating unit 107 will be described.

The rotating part 107 may rotate the wing 103 according to the state of the wave. 3 and 4 show the process of the wave (W) passing through the floating body (10). 3 shows a state in which the wave W enters the floating body 10. As shown in FIG. 3, when the wave W enters the floating body 10, the floating body 10 may pull the wire 12 while rising by the wave W. In this case, the rotating part 107 may rotate the wing 103 so that the degree to which the wing 103 is immersed in the sea level increases. That is, the rotating part 107 may rotate the wing 103 so that the end 1031 distant from the rotating shaft 102 is submerged in the sea level. For example, the rotating part 107 may rotate the wings 103 so that the longest end portion 1031a is submerged in the sea level when the floating body 10 rises by the wave W. According to such a structure, the amount of buoyancy received by the floating body 10 may increase as the degree to which the wings 103 are submerged in the sea level. Therefore, the floating body 10 can pull the wire 12 with a greater force, and more energy is transmitted to the power generation unit 11 so that the power generation unit 11 can produce more power.

4 shows a state in which the wave W has passed through the floating body 10. As shown in FIG. 4, when the wave W passes through the floating body 10 and exits, the floating body 10 may descend by the wave W. When the floating body 10 descends, tension may be released on the wire 12, so the tension holding unit 13 can pull the wire 12 to maintain the tension of the wire 12. In this case, the rotating part 107 may rotate the wing 103 so that the degree to which the wing 103 is submerged in the sea level is reduced. That is, the rotating part 107 may rotate the wing 103 so that the end 1031 close to the distance from the rotating shaft 102 is submerged in the sea level. For example, the rotating part 107 may rotate the wing 103 so that the shortest end 1031c is submerged in the sea level when the floating body 10 descends by the wave W. According to this structure, as the degree to which the wings 103 are submerged in the sea level is reduced, the amount of buoyancy received by the floating body 10 may be reduced or less affected by the waves. Therefore, when the floating body 10 is returned to the original position, energy consumed by the tension holding unit 13 can be reduced.

Meanwhile, at least one pair of the wings 103 of the plurality of wings 103 may be connected to the rotating shaft 102 so that the cross-sections are symmetrical with each other. For example, the first wing 103a and the second wing 103b may be connected to the rotating shaft 102 so that the cross-sections are symmetrical with each other. In addition, the rotation unit 107 may rotate at least one pair of the wings 103 of the plurality of wings 103 in the opposite direction to each other about the rotation axis 102. For example, the first wing 103a and the second wing 103b may be rotated in opposite directions. When the cross sections of the first and

second wings

103a and 103b are symmetrical to each other and are rotated in opposite directions, the moment of inertia generated when the blades 103 rotate may be offset, so the floating body ( The posture of 10) can be kept stable. Meanwhile, the plurality of wings 103 may be formed to have different cross-sectional shapes. In addition, the plurality of wings 103 may be connected to the rotating shaft 102 at different angles. The rotating unit 107 may rotate the plurality of wings 103, respectively. The rotating unit 107 may rotate each of the blades 103 with varying degrees of rotation.

The control unit 14 may control the operation of the rotating unit 107. The control unit 14 may adjust the degree of rotation and the presence or absence of rotation of the blade 103 by the rotating unit 107 according to the state of the wave. The control unit 14 may control the operation of the rotating unit 107 based on at least one of a wave moving direction, wave wave height, wave speed, wave period, and wave pattern. The control unit 14 compares the amount of energy consumed to rotate the blade 103 with the amount of energy that can be saved by rotating the blade 103 or the energy that is additionally produced, and rotates the portion 107 toward more profit ) Can be controlled. For example, if the wave height of the wave is not high, the control unit 14 may control the rotating unit 107 not to rotate the wing 103 when the wave exits the floating body 10. Alternatively, the control unit 14 may control the rotating part 107 so that the end portion 1031b of the intermediate length, not the longest end part 1031a or the shortest end part 1031c, of the wing 103 is submerged in the sea surface according to the state of the wave. You can. In addition, the control unit 14 controls the rotating unit 107 so that the degree to which the floating body 10 is immersed in the sea surface is controlled for the safety of the floating body 10 in extreme situations such as tsunami and tsunami. Can rotate. The control unit 14 may control the rotating unit 107 such that only all or some of the wings 103 of the plurality of wings 103 are rotated according to the state of the wave. For example, if the wave is relatively calm, the control unit 14 may control to rotate only two of the four wings.

As described above, although the embodiments have been described by the limited drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components such as the structure, device, etc. described may be combined or combined in a different form from the described method, or may be applied to other components or equivalents. Even if replaced or substituted by, appropriate results can be achieved.

Claims

A body floating on the sea level;

A rotating shaft horizontally connected to the body;

A blade rotatably connected to the rotating shaft; And

A floating body for wave power generation including a rotating part for rotating the blade about the rotation axis.
According to claim 1,

A cross section of the wing has a plurality of ends, and the distance from the rotating shaft to the plurality of ends is formed differently from the floating wave power generation.
According to claim 1,

The rotating part is a floating body for wave power generation that rotates the wing about the rotation axis so that the degree to which the wing is submerged in the sea level is adjusted according to the state of the wave.
According to claim 1,

The rotating part, the floating body for wave power generation to rotate the wing so as to increase the degree to which the wing is submerged in the sea surface when the floating body rises by the waves.
According to claim 1,

The rotating part, the floating body for wave power to rotate the wing so that the degree of submersion in the sea surface when the floating body is lowered by the waves.
According to claim 2,

When the end that is located farthest from the rotating shaft among the plurality of ends is the longest end and the closest end is the shortest,

The rotating part rotates the wing so that the longest end is submerged in the sea level when the floating body rises by the waves, and rotates the wing so that the shortest end is submerged in the sea level when the floating body descends by the waves. A floating body for wave power generation.
According to claim 1,

A plurality of said wings are provided, and the floating bodies for wave power generation respectively rotatable about the rotation axis.
The method of claim 7,

At least one pair of wings among the plurality of wings is connected to the rotating shaft so that the cross-sections are symmetrical with each other.
The method of claim 7,

The rotating part, the floating body for wave power for rotating at least any one pair of the plurality of wings in the opposite direction about the rotation axis.
According to claim 1,

The wing is a floating body for wave power generation formed in the longitudinal direction along the rotation axis.
A floating body including a body floating on the sea surface, a rotating shaft horizontally connected to the body, a blade rotatably connected to the rotating shaft, and a rotating part rotating the blade about the rotating shaft;

A power generation unit that generates electric power through the kinetic energy of the floating body; And

Wave power generating device comprising a wire for transmitting the kinetic energy of the floating body to the power generation unit.
The method of claim 11,

The rotating unit is a wave power generating device for rotating the wing about the rotation axis so that the degree to which the wing is submerged in the sea level.
The method of claim 11,

The cross section of the blade is a wave power generating device that is formed asymmetrically about the rotation axis.
The method of claim 11,

A wave power generating device further comprising a tension holding unit for maintaining the tension of the wire.
The method of claim 11,

The rotating unit, a wave power generating device for rotating the wing so that the degree of the wing is submerged in the sea level when the wire is pulled by the movement of the floating body in response to the wave.
The method of claim 14,

The rotating portion, when the wire is pulled by the tension holding portion, the wave power generating device for rotating the blade so that the degree of the wing is submerged in the sea level.
The method of claim 11,

The wire includes three wires each of which is fixed on the seabed,

The floating body is a wave power generator connected to the three wires and three points.
The method of claim 11,

Further comprising a control unit for controlling the operation of the rotating unit,

The control unit is a wave power generating device for controlling the operation of the rotating unit, based on at least one of the wave direction, wave wave height, wave speed, wave period, and wave pattern.