KR101599737B1 - Wave-force power generation system - Google Patents

Abstract

The wave power generation system according to the present embodiment includes a generator housing having an inner space; A wave generator installed inside the generator housing; An annular first floating module coupled to the outside of the generator housing to support the wave generator in a pivotable manner in a first axial direction; And an annular second floating module disposed outside the first floating module and rotatably supporting the first floating module in a second axial direction perpendicular to the first axial direction.

Description

Wave-force power generation system [0002]

The present embodiment relates to a wave power generation system capable of producing electricity using a sea wave.

Wave power generation (wave power generation) can be used for energy transfer by sea level waves, or for collecting such energy to produce electricity, to desalinate seawater, or to pumped water and transfer it to a required place. Wave refers to a temporary flow of tidal currents and distinguishes it from continuous sea movement such as ocean currents.

In general, wave power generators are often implemented as non-resonant systems. The non-equilibrium system floats buoys on the surface of the seawater and connects the generator body connected to the buoy. Accordingly, when the buoy moves up and down along the wave, electricity can be produced by electromagnetic interaction with the stator formed by the movable magnet, which is wound around the coil and installed movably in the generator body in conjunction with the motion. However, a wave power generator having such a configuration has a low expected output in a case where the wave power source is poor.

In order to solve the problem of the wave power generator constituted by the non-resonant system described above, researches on a resonant type system are under way. This resonance system has the advantage that the displacement of the vibrating body can be increased more than the displacement of the buoy. However, deflection of the linear spring may occur during low frequency tuning, and the power generation efficiency of the linear generator is low. In addition, it is not easy to appropriately tune according to the surrounding environment in which the wave power generator is installed.

Korean Registered Patent No. 10-0973017 (registered on July 23, 2010) Korean Registered Patent No. 10-1285875 (registered on July 20, 2013) Korean Registered Patent No. 10-1262932 (Registered on May 3, 2013)

The present embodiment provides a wave power generation system that facilitates tuning work for optimizing a power generation system according to the surrounding environment.

The wave power generation system according to the present embodiment includes a generator housing having an inner space; A wave generator installed inside the generator housing; An annular first floating module coupled to the outside of the generator housing to support the wave generator in a pivotable manner in a first axial direction; And an annular second floating module disposed outside the first floating module and rotatably supporting the first floating module in a second axial direction perpendicular to the first axial direction.

The buoyancy regulating device further includes a ballast tank installed outside the generator housing to regulate the buoyancy of the generator housing, wherein the buoyancy regulating device includes a ballast tank for accommodating either seawater or air in the inner space; A compressed air tank for supplying compressed air into the ballast tank; A first valve unit installed on a lower surface of the ballast tank for discharging seawater in the ballast tank; A second valve unit installed on the upper surface of the ballast tank for discharging air inside the normal ballast tank or for sucking outside air; And a third valve unit connected to the ballast tank at one end and connected to the compressed meat tank at the other end to supply compressed air inside the compressed air tank into the ballast tank according to a predetermined control signal .

The wave power generator includes a housing; A shaft rotatably installed in the housing; A pulley coupled to the shaft, the pulley being wound with a wire through which the shaft rotates in a rotating operation; A weight connected at one end to the wire; A plurality of elastic restoring units which form a restoring force in a direction opposite to a rotating direction during a rotating operation of the shaft; And a power unit for generating electricity by receiving power generated by the rotation of the shaft.

The elastic restoring unit includes: a first elastic restoring unit connected to the shaft; A second elastic restoring unit connected to the shaft by a first connection module; A third elastic restoring unit connected to the shaft and a second connecting module; And a fourth elastic recovery unit connected to the shaft and a third connection module.

The first connection module includes a first slave axis; A first mechanical lock, one end of which is coupled to the first driven shaft and the other end of which is connected to the shaft, for selectively connecting and separating the first driven shaft to the shaft; And a first bearing coupled to the other end of the first slave coaxial shaft and rotatably supporting the first slave coaxial shaft.

The second connection module includes a second bogie shaft; A second mechanical lock which is connected at one end to the second driven axis and the other end connected to the first driven axis and selectively connects and separates the second driven axis with the first driven axis; And a second bearing coupled to the other end of the second driven axis and rotatably supporting the second driven axis.

The third connection module comprises a third bogie axis; A third mechanical lock which is connected at one end to the third driven shaft and the other end connected to the second driven shaft and selectively connects and separates the third driven shaft to the second driven shaft; And a third bearing coupled to the other end of the third driven coaxial shaft to rotatably support the third driven coaxial shaft.

At least one support portion protruding upward and downward from the weight portion; And a cushioning member provided on the upper side and the lower side of the support portion.

The plurality of support portions may be coaxially arranged in the same number.

The weighing device may further include at least one rolling member on the outer circumferential surface, and the rolling member may be in rolling contact with an inner side surface of the guide tube provided inside the housing.

Since it is constituted by the resonance type power generation device, the power generation efficiency can be improved as compared with the conventional non-resonance type. In addition, the problem of static deflection can be solved through the introduction of a rotary vibrometer, and a rotary generator can be applied, thereby enabling a large capacity.

The rigidity of the entire system can be adjusted by selectively connecting a plurality of rigid units using a manual and automatic locking device such as a mechanical lock to adjust the natural frequency of the wave power generator, Wave generation can be performed after synchronizing with each other.

Further, since the power generation apparatus can be installed at the water surface position while the power generation apparatus is constructed in a hermetically sealed structure, the durability of the apparatus can be improved and the maintenance property can be improved.

In addition, when a disaster such as a typhoon occurs, it is possible to avoid the wave generator from underwater and minimize the damage of the apparatus due to natural disasters.

1 is a schematic plan view of a wave power generation system according to the present embodiment,
Fig. 2 is a side view of Fig. 1,
3 is a schematic view of a wave power generator according to the present embodiment,
FIG. 4 is a diagram showing the internal configuration of the wave power generator of FIG. 3,
Fig. 5 is an enlarged view of the main part of Fig. 4,
Fig. 6 is an enlarged view of the weight of Fig. 4. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

2 is a side view of Fig. 1, Fig. 3 is a schematic view of the wave power generator according to the present embodiment, Fig. 4 is a sectional view of the wave power generator of Fig. 3 Fig. 5 is an enlarged view of the main part of Fig. 4, and Fig. 6 is an enlarged view of the weight of Fig.

1 and 2 are views schematically showing a wave power generation system according to the present embodiment.

The wave power generation system may include a generator housing 1000, a first floating module 2000, and a second floating module 3000.

The generator housing 1000 has an internal space, and a wave generator 100 (see FIG. 3) may be installed therein. The shape of the generator housing 1000 may be variously configured, for example, cylindrical as shown in FIG. 2 and may be disposed at the center. The generator housing 1000 can remain suspended above the water surface S by the first and second floating modules 2000 and 3000. [

The first floating module 2000 may be coupled to the outside of the generator housing 1000 to support the wave generator 100 in a pivotable manner in the first axis direction. The first floating module 2000 may be formed in a ring shape surrounding the outer circumferential surface of the generator housing 1000 and connected to the generator housing 1000 by a first link C1. At this time, a pair of the first links C1 may be arranged coaxially.

The second floating module 3000 is coupled to the outside of the generator housing 1000 and may be coupled to the outside of the first floating module 2000. The second floating module 3000 can support the wave generator 100 so as to pivot in a second axis direction perpendicular to the first axis. For this purpose, the second floating module 3000 may be provided in a ring shape surrounding the outer circumferences of the generator housing 1000 and the first floating module 2000, and the first floating module 2000 and the second link (C2). At this time, the pair of the second links (C2) can be disposed coaxially with each other, and can be arranged to be perpendicular to the axis of the first link (C1).

As described above, when the generator housing 1000 is supported by the first and second floating modules 2000 and 3000, the generator housing 1000 can be installed on the water surface S irrespective of the direction of the waves, It is possible to perform smooth upward and downward and rotational motion in synchronization with the motion of this wave.

3 is a schematic diagram of a wave power generation system according to the present embodiment.

As shown in the figure, a wave generator 100 to be described later may be disposed inside the generator housing 1000. At this time, the wave power generator 100 may be disposed near the upper portion of the generator housing 1000.

In addition, a buoyancy regulating device for regulating the buoyancy of the generator housing 1000 may be provided outside the generator housing 1000.

The buoyancy regulating device may include a ballast tank 1100, a compressed air tank 1200, a first valve unit 1300, a second valve unit 1400 and a third valve unit 1500.

The ballast tank 1100 is installed outside the generator housing 1000 and may have a smaller volume than the generator housing 1000. In addition, the ballast tank 1100 may have a space portion therein to selectively receive gas and seawater in the compressed air tank 1200.

That is, when operating the wave power generation system according to the present embodiment, the inner space of the ballast tank 1100 is filled with gas, and the wave power generation system according to the present embodiment is kept floating on the water surface S If the typhoon or diary is not good, the gas inside the ballast tank 1100 is removed, and the surrounding seawater is sucked and filled with seawater so that the generator housing 1000 sinks into the sea.

The compressed air tank 1200 may be installed together with the generator housing 1000, and the installation position may be either the upper side or the side wall. Compressed air can be stored in the compressed air tank 1200, and compressed air can be stored by air compression means such as a compressor not shown. The stored air can be supplied into the ballast tank 1100 through a predetermined flow path. At this time, the air stored in the compressed air tank 1200 may be atmospheric air, but it is not limited thereto, and it is also possible to use a gas such as carbon dioxide or nitrogen if necessary. However, it is good to suck air in the atmosphere so that it can be easily charged periodically.

The first valve unit 1300 is for sucking and supplying seawater into the ballast tank 1100 and may be disposed at a position close to the bottom surface of the ballast tank 1100 as shown in FIG. have. This is because the bottom surface of the ballast tank 1100 is always located in the water, so that it is easier to suck the surrounding seawater than to install it elsewhere. The first valve unit 1300 is operated when it is necessary to sink the generator housing 1000 into the sea in order to ensure the safety of the wave power generation system according to the present embodiment in accordance with a control signal of a predetermined control unit, And supplies seawater to the inside of the tank 1100.

The second valve unit 1400 operates when the first valve unit 1300 is operated and can be used to discharge the air in the ballast tank 1100 to the atmosphere. According to the present embodiment, the second valve unit 1400 is disposed above the ballast tank 1100 because the ballast tank 1100 is always in contact with the atmosphere on the upper surface.

The third valve unit 1500 is connected to the compressed air tank 1200 at one end and connected to the ballast tank 1100 at the other end so that air in the compressed air tank 1200 flows into the ballast tank 1100, It is possible to perform the function of supplying the gas to the inside. That is, when it is necessary for the predetermined control unit to stop the operation of the wave power generation system according to the present embodiment or to prevent damage due to a natural disaster such as a typhoon, the control unit opens the first valve unit 1300 So that the surrounding sea water can be introduced into the ballast tank 1100 and at the same time the second valve unit 1400 can be opened to discharge the air in the ballast tank 1100 to the atmosphere. Conversely, when the wave power generation system in a state of being submerged in the sea is used, the first valve unit 1300 may be opened to discharge the seawater in the ballast tank 1100 to the sea. At this time, the third valve unit 1500 is opened so that the air inside the compressed air tank 1200 is injected into the ballast tank 1100 without any additional pump or the like, The seawater stored in the first valve unit 1300 may be discharged to the sea.

4 and 5 are views schematically showing a wave power generator 100 according to the present embodiment.

The wave power generation apparatus 100 may include a housing 101, a shaft 20, a pulley 30, a weight 40, a power generation unit 50, and an elastic recovery unit 60.

The housing 101 may be provided with a base 102 on an upper surface thereof and components constituting the wave power generator 100 may be installed on the base 102. However, the present invention is not limited thereto, and the shape and structure of the housing 101 may be variously changed according to the design. A base 102 may be disposed above the housing 101, and a plurality of support frames 103 may be provided to secure structural stability. Further, a guide tube 104 may be further provided to guide the upward and downward movement of the weight 40. At this time, the guide tube 104 may have a diameter or width corresponding to the width of the weight 40.

The shaft (20) is rotatably installed, and a pulley (30) can be rotatably installed on the shaft (20). At this time, the shaft 20 may be installed on the upper surface of the base 102 to be rotatable by a predetermined support member. However, the present invention is not limited thereto, and it may be rotatably fixed to various positions such as the housing 101 or the generator housing 1000, if the shaft 20 can be fixed in position. A bearing (not shown) for the rotation guide may be additionally provided at a connecting portion between the shaft 20 and the generator housing 1000, or a frictional rolling support member such as a sleeve may be installed.

The pulley 30 is fixedly coupled to the shaft 20 at a predetermined position. Accordingly, when the pulley 30 rotates, the shaft 20 can rotate together with the rotation of the pulley 30. A wire 35 of a predetermined thickness may be wound around the pulley 30 and one end of the wire 35 is fixedly coupled to the pulley 30 and the opposite end of the wire 35 is connected to a weight 40 .

The weight 40 is connected to one end of the wire 35 as described above so that even when the wire 35 is loosened by the pulley 30 as much as possible, As shown in FIG. The movement of the weight 40 and the wire 35 will be described later. The shape of the weights 40 may be variously configured, and according to the present embodiment, it may be provided in a substantially hexahedron shape as shown in FIG. At this time, at least one rolling member 41 is installed on the outer circumferential surface of the weight 40 so as to guide the upward and downward movement of the weight 40. According to the present embodiment, the rolling member 41 may be a rolling member in the form of a ball, or a rolling member in the form of a wheel.

The weight 40 may include at least one support portion 42 protruding upward and downward and a cushioning member 43 installed at the upper side and the lower side of the support portion 42. At this time, the plurality of support portions 42 may be arranged coaxially with the same number of upper and lower sides. In addition, the buffer members 43 may be made of a material having excellent elastic restoring force such as rubber or silicone, or an elastic member such as a coil spring may be used.

The power generation unit 50 may include a gear member that engages with the gear member 21 to which the rotational force of the shaft 20 is transmitted. The rotation of the gear member causes the rotor Electromagnetic power can be produced by electromagnetic interactions. Since the configuration of the power generation unit 50 is a technology of a known area, a detailed description thereof will be omitted.

The elastic restoring unit includes a first elastic restoring unit 61 connected to the shaft 20, a second elastic restoring unit 62 connected to the shaft 20 through a first connecting module 71, A third elastic restoring unit 63 connected to the shaft 20 and the second connecting module 72 and a fourth elastic restoring unit 64 connected to the shaft 20 and the third connecting module 73 have.

The first to fourth elastic recovery units 61 to 64 may be selectively connected to the system for adjusting the natural frequency of the wave power generation system according to the present embodiment for each stage. To this end, the first to third connection modules 71 to 73 may be connected to a predetermined control unit or a control unit so as to be operated manually or automatically.

The first connecting module 71 is connected to the first driven shaft 71a and the first driven shaft 71a and the other end is connected to the shaft 20 to connect the first driven shaft 71a, A first mechanical lock 71b selectively connecting and disconnecting the shaft 20 to the shaft 20 and a first mechanical lock 71b coupled to the other end of the first driven shaft 71a to rotatably support the first driven shaft 71a, And may include a bearing 71c.

The second connection module 72 has a second driven axis 72a and one end connected to the second driven axis 72a and the other end connected to the first driven axis 71a, A second mechanical lock 72b for selectively connecting and disconnecting the second driven shaft 72a with the shaft 20 and the first driven shaft 71a and a second mechanical lock 72b coupled to the other end of the second driven shaft 72a, And a second bearing 72c for rotatably supporting the first bearing 72a.

The third connection module 73 has one end coupled to the third driven axis 73a and the other end connected to the second driven axis 72a, A third mechanical lock 73b for selectively connecting and disconnecting the shaft 73a with respect to the shaft 20, the first driven axis 72a and the second driven axis 72a, And a third bearing 73c coupled to the third driven axis 73a for rotatably supporting the third driven axis 73a.

As described above, when the first to fourth elasticity restoring units 61 to 64 are connected by stages using the first to third connection modules 71 to 73, the elastic restoring force can be actively adjusted, The natural frequency of the wave power generator according to the embodiment can be appropriately adjusted.

The operation principle of the wave power generator constructed as described above will be schematically described.

When a wave is generated, the generated wave can form a certain waveform in the vertical direction of FIG. As shown in the figure, since the wave power generator 100 is configured to float on the surface of the seawater S, when the waves are generated on the surface of the seawater S, the housing 10 can move in the vertical direction in the drawing.

When the housing 10 is moved up and down, the weight 40 can move upward and downward due to the inertia generated by the movement of the housing 10. At this time, the weight 40 is connected to the wire 35. When the housing 10 moves downward at the initial position, the weight 35 moves downward and the wire 35 wound on the pulley 30 is loosened The wire 35 can be wound on the pulley 30 while the resilient restoring force of the elastic restoring unit 60 is acting together as the housing 10 moves upward. As described above, the pulley 30 is rotated while the wire 35 is wound around the pulley 30 and the pulley 30 is rotated.

When the pulley 30 rotates as described above, the shaft 20 coupled to rotate together with the pulley 30 can also input power to the transmission 50 while rotating. The input power can be set to an output value according to the natural frequency of the wave power generator 100 by adjusting the elastic restoring force of the first to fourth elastic recovery units 61 to 64.

의 관계를 만족할 수 있다. 병진 시스템의 임피던스(Z_t)는

와 같고, 회전 시스템의 임피던스(Z_r)은

와 같다. 여기서,

이고,

이다. 또한, 여기서 J는 시스템의 통합 관성이고, C_r은 기계 및 전자 댐핑이며, 위의 임피던스 들의 병렬 연결로부터 얻어지는 총 임피던스(Z_total)은 다음의 수학식 1과 같다.That is, when the radius of the pulley 30 is r, the mass of the housing 10 is m, the elastic modulus of the elastic restoring unit 70 is k, the rotational torque is T, the rotational angular velocity is OMEGA, M is the weight of the weight 40, V is the speed of gravity in the gravity direction, and F is the force acting on the weight 40,

Can be satisfied. The impedance (Z _t ) of the translating system is

, And the impedance Z _r of the rotating system is

. here,

ego,

to be. Also, where J is the integrated inertia of the system, C _r is the mechanical and electronic damping, and the total impedance (Z _total ) obtained from the parallel connection of the above impedances is as shown in the following equation (1).

[Equation 1]

의 변환 조화 베이스 가진으로 가정하면, 무게추(40)에 작용하는 관성력은

로 주어진다. 그러면, 상기한 바와 같이 구성된 파력 발전장치(100)에 수확되는 파워(P)는 다음의 수학식 2와 같이 산출될 수 있다.At this time,

, The inertia force acting on the weight 40 is

. Then, the power P to be harvested in the wave power generator 100 constructed as described above can be calculated by the following equation (2).

&Quot; (2) "

, 전자기 댐핑계수(ζe)는

, 고유 진동수(ω_n)는

, 무게추(40)의 진동수(ω_n)는

, 전자기 댐핑(c^e)는

와 같다.Here, the damping coefficient?

, The electromagnetic damping coefficient? E is

, The natural frequency (? _N )

, The frequency (? _N ) of the weight 40 is

, Electromagnetic damping (c ^e )

.

Therefore, the maximum power ( _Pmax ) of the wave power device according to the present embodiment can be obtained when the excitation frequency corresponds to the device natural frequency, i.e.,? =? _N , and the equation (2) Can be expressed.

&Quot; (3) "

는

이고, ρ는

이다.here,

The

, And rho is

to be.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10; Base 20; shaft
30; Pulley 40; Weights
50; Power generation unit 60; Elastic restoring unit
61; A first elastic restoring unit 62; The second elastic restoring unit
63; A third elastic restoring unit 64; The fourth elastic restoring unit
71; A first connecting unit 72; The second connecting unit
73; A third connecting unit 100; Wave generator
1000; Generator housing 2000; The first floating module
3000; A second floating module C1; The first connecting unit
C2; A second connection unit S; Sea level

Claims (8)

A generator housing having an internal space;
A wave generator installed inside the generator housing;
An annular first floating module coupled to the outside of the generator housing to support the wave generator in a pivotable manner in a first axial direction;
And an annular second floating module disposed outside the first floating module and rotatably supporting the first floating module in a second axial direction perpendicular to the first axial direction,
The wave power generator includes:
housing;
A shaft rotatably installed in the housing;
A pulley coupled to the shaft, the pulley being wound with a wire through which the shaft rotates in a rotating operation;
A weight connected at one end to the wire;
A plurality of elastic restoring units which form a restoring force in a direction opposite to a rotating direction during a rotating operation of the shaft; And
And a power unit for generating electricity by receiving the power generated by the rotation of the shaft,
The elastic restoring unit includes:
A first elastic restoring unit connected to the shaft;
A second elastic restoring unit connected to the shaft by a first connection module;
A third elastic restoring unit connected to the shaft and a second connecting module; And
And a fourth elastic restoration unit connected to the shaft and a third connection module.
The method according to claim 1,
And a buoyancy adjusting device installed outside the generator housing to adjust the buoyancy of the generator housing,
The buoyancy adjusting device comprises:
A ballast tank for containing either seawater or air in the inner space;
A compressed air tank for supplying compressed air into the ballast tank;
A first valve unit installed on a lower surface of the ballast tank for discharging seawater in the ballast tank;
A second valve unit installed on the upper surface of the ballast tank for discharging air inside the normal ballast tank or for sucking outside air; And
And a third valve unit connected to the ballast tank at one end and connected to the compressed air tank for supplying compressed air inside the compressed air tank into the ballast tank in accordance with a predetermined control signal, system.
delete delete 2. The apparatus of claim 1, wherein the first connection module comprises:
First type coaxial;
A first mechanical lock, one end of which is coupled to the first driven shaft and the other end of which is connected to the shaft, for selectively connecting and separating the first driven shaft to the shaft; And
And a first bearing coupled to the other end of the first slave coaxial shaft and rotatably supporting the first slave coaxial shaft.
6. The apparatus of claim 5, wherein the second connection module comprises:
Second type coaxial;
A second mechanical lock which is connected at one end to the second driven axis and the other end connected to the first driven axis and selectively connects and separates the second driven axis with the first driven axis; And
And a second bearing coupled to the other end of the second slave coaxial shaft and rotatably supporting the second slave coaxial shaft.
7. The apparatus of claim 6, wherein the third connection module comprises:
Third type coaxial;
A third mechanical lock which is connected at one end to the third driven shaft and the other end connected to the second driven shaft and selectively connects and separates the third driven shaft to the second driven shaft; And
And a third bearing coupled to the other end of the third driven coaxial shaft and rotatably supporting the third driven coaxial shaft.
[2] The apparatus according to claim 1,
At least one support portion protruding upward and downward; And
And a cushioning member provided on the upper and lower sides of the support portion.

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