KR101486046B1 - Wave-force power generation system - Google Patents

Abstract

According to an embodiment of the present invention, a wave force power generation system comprises: a floating body having an internal space; a wave power generation apparatus installed inside the floating body; a buoyancy adjustment apparatus installed in the lower part of the floating body to adjust the buoyancy of the floating body; a posture control weight installed in the lower part of the buoyancy adjustment apparatus to stably maintain an up and down location of the floating body; a wiring member connected to the posture control weight; and a fixated unit fixated on the bottom surface of the sea to prevent the erasure of the floating body by the wiring connection member.

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 it can increase the displacement of the armature rather 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 floating body having an internal space part; A wave generator installed inside the floating body; A buoyancy regulating device installed under the floating body to regulate buoyancy of the floating body; A posture control weight disposed below the buoyancy regulating device to maintain a vertical position of the floating body constant; A wiring member connected to the posture control weight; And a fixing unit fixed to the bottom surface of the seabed and configured to prevent leakage of the floating body through connection with the wiring member.

The wave power generator includes a housing; A first shaft rotatably installed in the housing; A pulley coupled to the first shaft, the pulley having a wire wound around the first shaft to rotate in a rotating operation; A weight connected at one end to the wire; A transmission connected to the first shaft to transmit power; A second shaft connected to an output end of the transmission; An elastic restoring unit that forms a restoring force in a direction opposite to a rotating direction during a rotating operation of the second shaft; And a power unit that receives power generated by the rotation of the second shaft to produce electricity.

The wave power generator includes a housing; A first shaft rotatably installed in the housing; A multi-pulley coupled to the first shaft, the multi-pulley including a plurality of unit pulleys of different diameters with wires wound around the first shaft interlocked in a rotating operation; A weight connected at one end to the wire; An elastic restoring unit that forms a restoring force in a direction opposite to a rotating direction during a rotating operation of the first shaft; And a power unit for generating electricity by receiving power generated by the rotation of the first shaft.

The unit pulleys may further include a latch unit for transmitting the rotational force of the unit pulley to the first shaft.

The power generating unit may receive rotational power of the first or second shaft through a gear connection.

The wave power generator may be sealed and shut off from outside air and seawater.

The wiring unit may transmit power generated by the wave power generator to the outside, and may apply a control signal to the pump module and the valve unit.

The fixed unit forms a network with other fixed units installed at adjacent positions, and can supply the generated electricity to the substation side.

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 is solved through the introduction of the rotary vibrometer, and the generation frequency is very low, which makes it possible to increase the capacity.

In addition, since the resonance frequency tuning can be performed using the gear ratio adjustment or the pulley radius adjustment, it is possible to tune the resonance frequency so as to optimize the wave generator according to the surrounding environment, especially the height of the wave.

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 view showing a main part of a wave power generator according to a first embodiment,
FIG. 2 is a schematic view showing a main part of a wave power generator according to a second embodiment, FIG.
3 is an enlarged cross-sectional view of part A of Fig. 2,
4 and 5 are views schematically showing an operation state of a power generation system provided with a wave power generator according to any one of the first and second embodiments,
6 and 7 are views schematically showing the operation state of the power generation system according to the third embodiment,
8 is a flowchart of the operation of the wave power generation system according to the present embodiment.

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.

1 is a schematic view of a wave power generator according to a first embodiment of the present invention.

The wave power generator includes a housing 10, a first shaft 20, a pulley 30, a weight 40, a transmission 50, a second shaft 60, an elastic restoring unit 70, 80).

The housing 10 has a predetermined space formed therein to form an outer appearance of the wave power generator, and may be formed in a hexahedron shape. However, the present invention is not limited thereto, and it may be formed to have various shapes such as a cylinder according to design needs.

The first shaft 20 is rotatably installed in the housing 10 and may be rotatably installed on the upper opening surface as shown in the figure. When the housing 10 is formed as a closed structure, Or may be installed in the inner space of the housing 10. A bearing (not shown) for the rotation guide may be additionally provided at a connecting portion between the first shaft 20 and the housing 10, or a frictional rolling support member such as a sleeve may be provided.

The pulley 30 is fixedly coupled to a predetermined position of the first shaft 20. Therefore, when the pulley 30 rotates, the first 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 as much as possible from the pulley 30 as shown in the figure, As shown in FIG. The movement of the weight 40 and the wire 35 will be described later.

The transmission 50 receives the rotational force of the first shaft 20, changes the rotational force of the first shaft 20 to a rotational force suitable for the system, and rotates the second shaft 60. The transmission 50 may be configured in various manners, including a general gear transmission as well as a transmission such as a CVT or a planetary gear. The type of the speed shift device 50 can be used as long as it can vary the rotational force of the first and second shafts 20 and 60.

The second shaft 60 receives the power of the transmission 50 and may be integrally formed with the output shaft of the transmission 50 or may be connected to a predetermined output shaft by coupling or the like Do. The diameters of the first and second shafts 20 and 60 may be the same, but the diameters of the first and second shafts 20 and 60 are not limited thereto. However, the diameters of the first and second shafts 20 and 60 are preferably the same for controllability. The second shaft 60 may be provided with a first gear member 55 for transmitting the rotational force output from the transmission 50 to the power generator 80.

The elastic restoring unit 70 may be connected to the second shaft 60 so that the weight shaft 40 can be restored to its initial state by restoring the second shaft 60 as long as the second shaft 60 is rotated.

The power generation unit 80 may include a second gear member 85 that engages with the first gear member 55 that receives the rotational force of the transmission 50 and the second shaft 60, The rotation of the gear member 85 can produce an electric power by electromagnetic interaction between the stator and the rotor while the rotor (not shown) rotates. Since the configuration of the power generation unit 80 is a technology of a known area, a detailed description thereof will be omitted.

2 is a view showing an example of a wave power generator according to a second embodiment.

As shown in the figure, in comparison with the first embodiment, the pulley 20 is replaced by a multiple pulley 20 composed of a plurality of unit pulleys 131, 132, and 133 having different diameters, There is a difference in that the device 50 is deleted.

As shown in the figure, each of the unit pulleys 131, 132, and 133 is individually wound with a wire 135 composed of the first through third wires 135a, 135b, and 135c. The wires 135 may be connected to the weight pulley 40 at one end and may be connected to the multiple pulleys 130 at the other end composed of the unit pulleys 131, 132 and 133.

At this time, a latch 136 may be installed in the unit pulleys 131, 132, and 133 as shown in FIG. 3 shows a configuration in which the latch 136 is provided in the first unit pulley 131. The latch 136 is provided inside the second and third unit pulleys 132 and 133 Or may be installed movably along the first shaft 20 and selectively fixed within the first to third unit pulleys 131, 132, For example, when the latch 136 is disposed on the first unit pulley 131 and the first unit pulley 131 is rotated by inertia of the weight 40, the rotation is transmitted to the first shaft 20 by the latch, Lt; / RTI > However, since the second and third unit pulleys 131 are connected to the first shaft 20 in an idle state, they rotate like the first unit pulley 131, but the power generated by the rotation is transmitted to the first shaft 20 ).

In this way, the latch 136 transmits the rotational force of the first to third unit pulleys 131 to the first shaft 20, and is used as a gear box or the like for tuning optimized for frequency components of waves and the like There is an advantage in that power transmission can be tuned through a simple configuration as compared with the configured transmission device 50 configured.

4 is a view schematically showing an example of a power generation system equipped with the wave power generator according to the first or second embodiment.

As shown in the figure, the wave power generator 100 constructed as described above may be installed inside a floating body 1100 having a space inside so as to float on the sea surface S. The inner space 1111 of the floating body 1100 may be filled with air to form a buoyant force and float on the surface of the water.

According to the present embodiment, the floating body 1100 may be provided with a pump module 1200 capable of sucking seawater at a position locked by seawater, and may be installed on the side wall of the floating body 1100, However, it is also possible to form it on the bottom surface.

5, seawater is injected into the inner space 1111 of the floating body 1100 so that the floating body 1100 is positioned below the sea level .

When the seawater is introduced by the operation of the pump module 1200, the air contained in the internal space 1111 must be discharged to the outside. Thus, the upper side of the floating body 1100 or the upper side of the side wall includes an internal space 1111 A duct 1310 and a valve unit 1300 may be provided so as to discharge the air of the indoor unit 1310 to the atmosphere. When the pump module 1200 is operated, the valve unit 1300 is opened and the air contained in the internal space 1111 can escape into the atmosphere. When the sea weather condition improves, the pump module 1200 is opened again so that air in the air can be introduced into the internal space 1111 when the seawater stored in the internal space 1111 is discharged to the outside. do.

Meanwhile, the duct 1310 needs to be formed over a certain length. That is, even if the floating body 1100 sinks below the sea level due to the inflow of seawater by the pump module 1200, the duct 1310 must be exposed above the sea level. The valve unit 1300 may be installed at the upper end of the duct 1310 as shown in the figure but is not limited thereto and may be installed anywhere in the duct of the duct 1310. However, considering the damage by flooding, it is recommended that it is installed as close as possible to the water surface.

In addition, the duct 1310 may be formed in a flexible tubular shape so as to extend over a sufficient length, and may have a length corresponding to the diving depth of the floating body 1100, It can be wound and stored in the inner space of the floating body 1100.

A posture maintaining weight 1400 may be provided on the bottom surface side of the floating body 1100. The posture maintaining weight 1400 serves to maintain the posture such that the portion where the valve unit 1300 is installed is always upward and the portion where the pump module 1200 is installed is always downward.

A wiring member (not shown) for sending electricity generated by the wave power generator 100 and applying power and control signals to the pump module 1200 and the valve unit 1300, 1450 may be installed. The wiring member 1450 may include a chain or the like to prevent the floating body 1100 from being lost by being coupled with a fixing unit 1500 installed on the sea floor.

At this time, the fixing device 1500 may perform only the fixing of the position of the floating body 1100, but it is not limited thereto, and the wiring parts for supplying and discharging power may be formed together, It is also possible to transmit the electric power obtained by performing the wave power generation in a certain area of the sea to the substation installed on the sea or the sea floor together with the adjacent fixing devices 1500.

According to the third embodiment, as shown in FIGS. 6 and 7, a separate buoyancy regulating device 2000 may be installed below the wave power generator 100 according to the first or second embodiment. At this time, the wave power generator 100 may have a sealing structure to block the inflow of seawater, and may be made of a material that is not corroded by seawater, such as synthetic resin.

The buoyancy regulator 2000 is coupled to the bottom of the wave power generator 100 to float the wave power generator 100 above sea level as required or to sink to a deep water depth D below 30 m below the sea level Can be performed.

6 and 7, the buoyancy regulator 2000 can be configured to be elongated and compressed in the longitudinal direction, and the buoyancy regulator 2000 can be configured such that when the wave generator 100 is lifted above the water surface, H1) and may have a second height (H2) in a state where the wave power generator (100) sinks below the water surface. At this time, the first height H1 may be larger than the second height H2.

Air and seawater may be selectively contained in the internal space of the buoyancy regulator 2000. That is, when the wave power generator 100 is floated on the sea surface, the inner space can be filled with air to form a positive buoyancy. When the wave power generator 100 is submerged below sea level, The seawater is sucked into the pump 1200 to fill it, so that it can have negative buoyancy.

On the other hand, in order to float the wave power generation device 100, which has been in a sunken position, to the sea level again, it is necessary to push out the seawater injected into the buoyancy regulator 2000 and also to inject air for positive buoyancy formation. At this time, air to be injected may be air stored in the wave power generator 100, or compressed air contained in a separate gas tank may be used. It is possible to design and modify variously according to the size of the wave power generator 100.

On the bottom side of the buoyancy regulating device 2000, a posture maintaining weight 1400 may be provided on the bottom side as in the first and second embodiments. The posture maintaining weight 1400 serves to maintain the posture so that the upper surface of the wave power generator 100 can always be directed upward.

A wiring member 1450 for sending electricity generated by the wave power generator 100 and applying power and control signals to the pump module 1200 may be installed inside the posture maintaining weight 1400 have. The wiring member 1450 may include a chain or the like to prevent the floating body 1100 from being lost by being coupled with a fixing unit 1500 installed on the sea floor.

At this time, the fixing device 1500 may perform only the fixing of the position of the floating body 1100, but it is not limited thereto, and the wiring parts for supplying and discharging power may be formed together, It is also possible to transmit the electric power obtained by performing the wave power generation in a certain area of the sea to the substation installed on the sea or the sea floor together with the adjacent fixing devices 1500.

The operation principle of the wave power generator according to the first to third embodiments configured 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 70 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.

As described above, when the pulley 30 rotates, the first shaft 20 coupled to rotate together with the pulley 30 can also be rotated to input power to the transmission 50. The input power can be adjusted so as to generate maximum output in the transmission (50). On the other hand, the transmission device 50 can set an output value according to the natural frequency of the wave power generator 100 described above.

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(50)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 inertial force acting on the weights 50 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.

)로 가정하면, 고유 진동수 및 최대 파워가 서로 반비례 한다는 것이 수학식 4에서 확인될 수 있다. In Equation (3), a constant input acceleration (i.e.,

), It can be confirmed from Equation (4) that the natural frequency and the maximum power are inversely proportional to each other.

&Quot; (4) "

Also, Equation (4) may be expressed differently from the original parameters as shown in Equation (5).

&Quot; (5) "

Therefore, according to the wave power generation system to which the wave power generator according to the first to third embodiments is applied, there is an advantage that the output of the generator can be increased when the excitation frequency is low.

With the above-described principle, it is possible to easily tune the wave generator according to the wave period.

That is, as shown in the flowchart of FIG. 8, the wave period of the corresponding area is measured at a predetermined period or time unit in the area where the wave power generator 100 is installed (S10). When the wave period is measured, the wave period is compared with the natural period of the wave generator 100 constructed as described above (S20). If the natural period of the wave generator 100 is equal to the wave period Wave power generation is performed (S30).

When the natural period of the wave generator 100 is different from the period of the wave, the wave generator 100 is tuned in the same manner as in the first and second embodiments, and the natural frequency of the wave generator 100 And wave power generation can be performed after synchronizing the wave period of the wave power generator 100 with the wave period.

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; A housing 20; The first shaft
30; Pulley 40; Weights
50; A transmission device 60; Second shaft
70; Elastic restoring unit 80; Power generation unit
100; Wave power generator 1100; Floating body
1200; Pump module 1300; Valve unit
1310; Duct 1400; Weight maintenance
1450; A wiring member 1500; Fixed unit
2000; Buoyancy regulator

Claims (8)

delete A floating body having an inner space;
A first shaft installed inside the floating body, a first shaft rotatably installed in the housing, a pulley coupled to the first shaft and wound with a wire through which the first shaft rotates in a rotating operation, A second shaft connected to an output end of the transmission; and a second shaft connected to the output end of the transmission, the second shaft being connected to the first shaft, An elastic restoring unit for generating a restoring force in an opposite direction; and a power generating unit for generating electricity by receiving the power according to the rotation of the second shaft;
A buoyancy regulating device installed under the floating body to regulate buoyancy of the floating body;
A posture control weight disposed below the buoyancy regulating device to maintain a vertical position of the floating body constant;
A wiring member connected to the posture control weight; And
And a fixing unit fixedly installed on a bottom surface of the seabed to prevent leakage of the floating body through connection with the wiring member.
A floating body having an inner space;
A first shaft installed inside the floating body, the first shaft being rotatably installed in the housing, and a second shaft coupled to the first shaft, the first shaft being rotatably connected to the first shaft, An elastic restoring unit that forms a restoring force in a direction opposite to a rotating direction of the first shaft when the first shaft is rotated; And a power generating unit for generating electricity by receiving the power generated by the rotation of the power generating unit;
A buoyancy regulating device installed under the floating body to regulate buoyancy of the floating body;
A posture control weight disposed below the buoyancy regulating device to maintain a vertical position of the floating body constant;
A wiring member connected to the posture control weight; And
And a fixing unit fixedly installed on a bottom surface of the seabed to prevent leakage of the floating body through connection with the wiring member.
The method of claim 3,
Wherein the unit pulleys further include a latch unit for transmitting the rotational force of the unit pulley to the first shaft.
4. The method according to any one of claims 2 and 3,
Wherein the power generating unit receives rotational power of the first or second shaft through a gear connection.
4. The method according to any one of claims 2 and 3,
Wherein the wave power generator is sealed and cut off from outside air and seawater.
delete 4. The apparatus according to claim 2 or 3,
A wave generating system that forms a network with other fixed units installed at adjacent locations and supplies the generated electricity to the substation side

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