JP5858376B2 - Wave power generation system - Google Patents

Description

  The present invention relates to a wave power generation system.

  In recent years, depletion of fossil fuels such as oil and environmental measures represented by global warming have been recognized as serious problems, and renewable energy (natural energy) that has little impact on the environment is used. Power generation has attracted attention. Among these, wave power generation uses wave power generated in the sea covering an area of 70% of the earth's surface, and has attracted attention as an influential energy source (see, for example, Patent Documents 1 and 2).

  For example, Patent Document 1 describes a wave power generation system including a gyro device. In the wave power generation system disclosed in Patent Document 1, the floating body swings in response to the wave motion, and the generator is driven to generate electric power.

  Patent Document 2 describes a wave power generation device using a breakwater. In the wave power generation device of Patent Document 2, a rotating blade is provided in a water-permeable hole provided in a breakwater, and power generation is performed using energy of a water flow passing through the water-permeable hole.

JP 2008-231967 A Japanese Patent Laid-Open No. 7-252816

  However, if the installation of structures in the ocean is strictly restricted from the viewpoint of ship navigation safety and fishing ground securing, the wave power generation system disclosed in Patent Document 1 may not be installed. Further, the wave power generation device disclosed in Patent Document 2 does not effectively use wave power and cannot perform sufficient power generation.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a wave power generation system that can be easily installed and efficiently generates power.

  A wave power generation system according to the present invention includes a breakwater, a water wheel provided on the breakwater, a rotating shaft that rotates in conjunction with the rotation of the water wheel, and a generator that generates electric power along with the rotation of the rotating shaft. The breakwater is provided with a slit and a water reserving chamber in communication with the slit, and the water wheel is provided in at least one of the slit and the water reserving chamber.

  In one embodiment, the water turbine is configured to be rotatable in accordance with both a flow of water flowing into the water reserving chamber through the slit and a flow of water flowing out of the water reserving chamber through the slit. ing.

  In one embodiment, the water wheel includes a plurality of water wheel parts that rotate the rotating shaft.

  In one embodiment, each of the plurality of water turbine units has a water turbine blade, and the water turbine blades of the plurality of water turbine units are arranged at different positions with respect to the rotation shaft.

  In one embodiment, the plurality of turbine parts include a first turbine part having a first turbine blade and a second turbine wheel having a second turbine blade disposed at a position approximately 120 ° different from the first turbine blade. And a third turbine section having a third turbine blade disposed at a position different from the second turbine blade by approximately 120 °.

  In one embodiment, the length along the horizontal direction of the slit is shorter than the length along the horizontal direction of the water reserving chamber.

  In one embodiment, the length of the slit along the horizontal direction is shorter than the length of the slit along the vertical direction.

  In one embodiment, the length along the horizontal direction and the length along the vertical direction of the slit correspond to the length along the horizontal direction and the length along the vertical direction of the water wheel.

  In one embodiment, the rotation axis is arranged along a vertical direction.

  In one embodiment, the water wheel includes a Savonius type water wheel.

  In one embodiment, the breakwater has a front surface provided with the slit, and the length along the horizontal direction of the slit is a portion of the front surface of the breakwater where the slit is not provided. Less than half of the length along the horizontal direction.

  In one embodiment, the breakwater is provided with a plurality of slits and a plurality of water chambers that communicate with the plurality of slits, respectively, and the wave power generation system includes a plurality of slits corresponding to the plurality of slits. A water wheel is further provided.

  In one embodiment, the plurality of slits, the plurality of water chambers, and the plurality of water turbines are arranged in a horizontal direction.

  According to the present invention, it is possible to provide a wave power generation system that can be easily installed and efficiently performs wave power generation.

It is a mimetic diagram showing an embodiment of a wave power generation system by the present invention. (A), (b), and (c) are the typical sectional view seen from the upper surface of the breakwater in the wave power generation system of this embodiment, the typical sectional view seen from the side, and the typical front, respectively. FIG. It is a typical top view of the water wheel in the wave power generation system of this embodiment. (A) And (b) is the typical top view and side view of the water turbine in the wave power generation system of this embodiment, respectively. (A) is the typical sectional view which looked at the water turbine in the wave power generation system of this embodiment from the upper surface, (b) is the typical sectional view which looked at the wave power generation system of (a) from the side, (C) is a typical front view of the wave power generation system of (a). (A) is a schematic diagram which shows the wave-making water tank provided with the breakwater in the wave power generation system of this embodiment, (b) is the model showing the velocity vector of the water flow in the wave-making water tank shown to (a). FIG. (A) It is a schematic diagram which shows the motive power measurement system for measuring the motive power in the wave power generation system of this embodiment, (b) is a schematic diagram of the A-A 'cross section of (a). (A)-(d) is a graph which shows each time change of the liquid level displacement h, angular velocity (omega), torque T, and motive power P. FIG. (A) is a graph showing the change in the average angular speed omega _a and the average power P _a to the average torque T _a, (b) is a graph showing changes in the maximum average power P _amax for waveform gradient gamma.

  Hereinafter, embodiments of a wave power generation system according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

  In FIG. 1, the schematic diagram of the wave power generation system 10 of this embodiment is shown. The wave power generation system 10 includes a breakwater 20, a water wheel 30 provided on the breakwater 20, a rotating shaft 40 that rotates in conjunction with the rotation of the water wheel 30, and a generator 50 that generates electric power as the rotating shaft 40 rotates. And. The water turbine 30 rotates according to the reciprocating flow formed by the waves. The rotating shaft 40 rotates with the rotation of the water turbine 30, and the generator 50 generates power with the rotation of the rotating shaft 40. In the following description of this specification, the water turbine 30, the rotating shaft 40, and the generator 50 may be collectively called the power generation unit 60.

  The breakwater 20 is provided with a slit 20s and a basin 20t, and the basin 20t communicates (continues) with the slit 20s. The slit 20 s is provided on the front surface (offshore side) of the breakwater 20. For this reason, when a wave collides with the breakwater 20 provided with the slit 20s and the water reserving chamber 20t, the energy of the wave is dissipated by the vortex generated in the vicinity of the slit 20s, and the wave is dissipated.

  In the wave power generation system 10 of the present embodiment, the water turbine 30 is provided in the water reserving chamber 20t, or is provided across the slit 20s and the water reserving chamber 20t. Alternatively, when the thickness of the slit 20s is relatively large compared to the water wheel 30, the water wheel 30 may be provided in the slit 20s. Thus, the water wheel 30 is provided in at least one of the slit 20s and the water reserving chamber 20t.

  In the wave power generation system 10, when a wave coming toward the breakwater 20 reaches the slit 20 s, the direction of the water flow is aligned in the slit 20 s and the speed of the water flow is accelerated. The water turbine 30 is rotated by such a water flow, and the generator 50 generates electric power as the water wheel 30 and the rotating shaft 40 rotate. For this reason, the wave power generation system 10 can efficiently generate power using wave power. In general, since the power generation output is proportional to the cube of the water flow velocity, the power generation output can be efficiently increased by accelerating the water flow. In the front surface of the breakwater 20, the speed of the water flow flowing through the slit 20s can be increased as the ratio of the length along the horizontal direction of the wall portion to the length along the horizontal direction of the slit 20s increases. For example, when the ratio of the length of the wall portion and the slit 20s in the horizontal direction is 2: 1 on the front surface of the breakwater 20, the speed of the water flow flowing through the slit 20s is about 3 times, and the power generation output is about 27 times. can do.

  Further, the water that has flowed into the water reserving chamber 20t through the slit 20s then flows out from the water reserving chamber 20t through the slit 20s. In the wave power generation system 10 of the present embodiment, the water turbine 30 can generate power using the flow of water that flows out of the reclaimed water chamber 20t through the slit 20s.

  For example, the generator 50 is provided on the breakwater 20. In the wave power generation system 10 shown in FIG. 1, the breakwater 20 is used as a structure for installing the water turbine 30, the rotating shaft 40, and the generator 50, and the existing breakwater 20 of such a wave power generation system 10 is used. Breakwater can be used. From the viewpoint of ship navigation safety and securing of fishing grounds, there are cases where the installation of structures in the ocean is strictly restricted, but even in this case, there are no structures or floating bodies that occupy the sea area separately from the breakwater 20 In addition, since the existing breakwater can be used, it is easy to obtain permission for installing the wave power generation system 10. In particular, in Japan having a coastline that is long with respect to the land area, it is significant to use the wave power generation system 10. Moreover, since the wave power generation system 10 is installed using the breakwater 20, the number of parts of the wave power generation system 10 can be reduced, and the weight and cost of the power generation system can be suppressed.

  The breakwater 20 may be continuous with the land, or the breakwater 20 may be isolated in the sea area without being continuous with the land. However, the breakwater 20 is preferably installed at a location relatively close to the coastline. In this case, waves traveling in a substantially constant direction collide with the breakwater 20, and the water turbine 30 rotates using the waves efficiently, so that power generation can be performed efficiently. Moreover, when the wave power generation system 10 is installed in a place close to the coastline, power transmission can be performed relatively easily.

  As shown in FIG. 1, when viewed from the front, the slit 20s has a rectangular shape. In this way, when the slit 20s has a simple shape, a contracted flow is generated in a direction substantially parallel to the water surface and substantially perpendicular to the wave traveling direction. Conceivable. Moreover, it is preferable that the length along the horizontal direction of the slit 20s is shorter than the length along the horizontal direction of the water reserving chamber 20t. Can be reduced. Here, the horizontal direction corresponds to a direction along the water surface in a state where there is substantially no wave.

  The length of the slit 20s along the horizontal direction is preferably less than or equal to half the length of the front surface of the breakwater 20 where the slit 20s is not provided along the horizontal direction. Moreover, it is preferable that the length along the horizontal direction of the slit 20s is shorter than the length along the vertical direction of the slit 20s. Such a slit 20s is also called a vertically long slit. Here, the vertical direction corresponds to a direction parallel to the direction of gravity.

  Here, the length of the slit 20s along the vertical direction is larger than the length of the slit 20s along the horizontal direction, and the length of the water turbine 30 along the vertical direction is the length along the horizontal direction of the water turbine 30. Bigger than that. As described above, the length along the horizontal direction and the vertical direction of the slit 20s corresponds to the length along the horizontal direction and the vertical direction of the water wheel 30, so that the water flow accelerated in the slit 20s is turned into the rotational motion of the water wheel 30. It can be converted efficiently. For example, the length along the horizontal direction and the vertical direction of the slit 20 s is preferably substantially equal to the length along the horizontal direction and the vertical direction of the water wheel 30. Alternatively, the length of the slit 20s along the horizontal direction and the vertical direction may be slightly larger than the length of the water turbine 30 along the horizontal direction and the vertical direction.

  Hereinafter, the breakwater 20 in the wave power generation system 10 will be described with reference to FIG. 2A shows a schematic cross-sectional view seen from the top surface of the breakwater 20, FIG. 2B shows a schematic cross-sectional view seen from the side surface of the breakwater 20, and FIG. 2C shows a schematic view of the breakwater 20 A typical front view is shown.

  For example, when the slit 20s is viewed from the front direction, the length along the horizontal direction of the slit 20s is shorter than the length along the vertical direction of the slit 20s. For example, the length of the slit 20s along the horizontal direction is about 50 cm, and the length of the slit 20s along the vertical direction is about 400 cm. Moreover, the length along the horizontal direction of the water drinking chamber 20t is about 170 cm, and the length along the vertical direction of the water drinking chamber 20t is about 600 cm.

  Moreover, it is preferable that each of the slit 20s and the water reserving chamber 20t has a substantially rectangular parallelepiped shape. Thereby, even if the size of the slit 20s is relatively large, the strength of the breakwater 20 is appropriately maintained, and even when the thickness of the slit 20s (the length along the wave traveling direction) is relatively short, The water flow can be accelerated efficiently. Furthermore, the breakwater 20 provided with the rectangular parallelepiped slit 20s and the water chamber 20t can be produced relatively easily. Although not shown in FIG. 2, as described above, the water wheel 30 may be disposed across the slit 20s and the water reserving chamber 20t.

  In the wave power generation system 10, the water in the reclaimed water chamber 20t does not flow in and out from other than the slit 20s, and the water that flows into the reclaimed water chamber 20t through the slit 20s is reflected in the reclaimed water chamber 20t, and the reflected water is also reflected. It is used for the rotation of the water wheel 30 (FIG. 1). Here, the breakwater 20 has a front surface, a back surface, a lower surface, and side surfaces provided with slits 20s. Moreover, the breakwater 20 may have an upper surface as needed. Reservoir chamber 20t is defined by the front, back, bottom, and side surfaces (and the top surface as needed) of breakwater 20. In this case, an opening (slit 20s) is provided only on the front surface of the breakwater 20, but no openings are provided on the back surface, the bottom surface, and the side surface, and the water that flows into the water reserving chamber 20t through the slit 20s The water reflected and reflected in the chamber 20t is also used to rotate the water wheel 30 (FIG. 1).

  The water turbine 30 shown in FIG. 1 is rotatable in accordance with both the flow of water flowing into the reclaimed water chamber 20t through the slit 20s and the flow of water flowing out of the reclaimed water chamber 20t through the slit 20s. It is preferable to be configured. Moreover, in FIG. 1, the rotating shaft 40 is arrange | positioned so that it may extend in a perpendicular direction, and the water turbine 30 rotates in a horizontal direction with a water flow. Since a part of the rotating shaft 40 is located on the water surface, the rotating shaft 40 and the generator 50 can be easily connected without submerging the generator 50 in water. For example, a Savonius type water wheel is used as the water wheel 30.

  FIG. 3 shows a schematic top view of the water wheel 30. The water wheel 30 shown in FIG. 3 is a Savonius type water wheel. The turbine 30 has two turbine blades 30w. The turbine blade 30w is disposed around the rotating shaft 40. Since the waves generate a sinusoidal reciprocating flow, it is preferable to use a Savonius type water turbine whose rotation direction does not depend on the direction of the water flow. 3 shows a Savonius type turbine, but a Darrieus type turbine or a gyromill type turbine may be used as the turbine 30.

  The water wheel 30 may have a plurality of water wheel parts. For example, the water wheel 30 may have two water wheel parts, or may have three or more water wheel parts.

  FIG. 4 shows an example of the water turbine 30 in the wave power generation system 10 of the present embodiment. FIG. 4A shows a schematic top view of the water turbine 30, and FIG. 4B shows a schematic side view of the water turbine 30. The water wheel 30 shown in FIG. 4 has water wheel parts 30a, 30b, and 30c that rotate the same rotating shaft 40. The water turbine parts 30a, 30b, 30c are arranged in the vertical direction along the same rotation axis 40.

  The turbine parts 30a, 30b, and 30c have turbine blades 30aw, 30bw, and 30cw, respectively. When separated from the rotating shaft 40, the turbine blades 30aw, 30bw, and 30cw of the turbine units 30a, 30b, and 30 have the same shape. The turbine blades 30aw, 30bw, and 30cw of the water turbine units 30a, 30b, and 30c are arranged at different positions with respect to the rotary shaft 40 while being fixed to the rotary shaft 40. The turbine blade 30bw is disposed at a position that is approximately 120 ° different from the turbine blade 30aw, and the turbine blade 30cw is disposed at a position that is approximately 120 ° different from each of the turbine blade 30aw and the turbine blade 30bw. In the present specification, the turbine parts 30a, 30b, and 30c may be referred to as a first turbine part 30a, a second turbine part 30b, and a third turbine part 30c, respectively, and the turbine blades 30aw, 30bw, and 30cw are respectively referred to as a first turbine. The blades 30aw, the second turbine blade 30bw, and the third turbine blade 30cw may be called.

  As described above, the turbine blades 30aw, 30bw, and 30cw are arranged at different positions with respect to the rotation shaft 40, so that the rotation can be made smooth. Here, the water turbine 30 has the three water turbine portions 30a, 30b, and 30c, but the present invention is not limited to this. The water turbine blade 30w of the water turbine 30 may be configured to smoothly rotate about 360 ° with respect to the rotation shaft 40.

  In the above description, the horizontal length of the slit 20s is shorter than the vertical length of the slit 20s and the slit 20s is vertically long. However, the present invention is not limited to this. The length of the slit 20s in the horizontal direction may be longer than the length of the slit 20s in the vertical direction, and the slit 20s may be horizontally long.

  The actual sea level varies depending on the time according to the tide and weather conditions. In the case of a general weather situation, it is preferable that the water wheel 30 is arranged so that at least a part of the water wheel 30 exists below the sea surface at an arbitrary time. Moreover, it is preferable that the breakwater 20 is provided with a plurality of slits 20s and water play chambers 20t, and the water wheel 30 is disposed in at least one of the slits 20s and the water play chambers 20t.

  The wave power generation system 10 of the present embodiment will be described with reference to FIG. FIG. 5A shows a schematic cross-sectional view of the water turbine 30 of the wave power generation system 10 as viewed from above, and FIG. 5B shows a schematic cross-sectional view of the wave power generation system 10 as viewed from the side. A schematic front view of the wave power generation system 10 is shown in FIG.

  In the wave power generation system 10 shown in FIG. 5, the plurality of slits 20s, the plurality of water chambers 20t, and the plurality of water turbines 30 are arranged in the horizontal direction. The plurality of water turbines 30 are arranged corresponding to the plurality of slits 20s. Here, the generator 50 is attached to the back surface of the top surface of the breakwater 20 (the internal top surface of the water play chamber 20t). Further, the plurality of water reserving chambers 20t may be in communication with each other.

  In such a wave power generation system 10, a plurality of power generation units 60 can be easily installed, and a desired power generation amount can be obtained according to the number of power generation units 60 installed. For example, several hundred power generation units 60 can be installed per 1 km of the length of the breakwater 20, and a power generation amount of several hundred W can be obtained from one power generation unit 60.

  Below, with reference to FIG. 6, the flow of the water which flows through the slit 20s of the breakwater 20 is demonstrated. As shown to Fig.6 (a), the wave-making water tank V provided with the breakwater 20 which has the slit 20s and the reclaimed water chamber 20t is prepared.

  A wave traveling toward the breakwater 20 is generated in the wave-making water tank V. FIG. 6B shows, by arrows, velocity vectors in a horizontal plane with a depth of 0.8 m when waves generated in the wave-making water tank V flow into the water reserving chamber 20t through the slit 20s of the breakwater 20. Such a velocity vector can be obtained by simulation. From FIG. 6B, it is understood that the flow of water is accelerated when passing through the slit 20s. In addition, although not shown here, the water wheel 30 in the breakwater 20 is disposed at a position where the water flow is fast in the water reserving chamber 20 t of the breakwater 20.

  Here, the result of measuring the power of the wave power generation system 10 will be described with reference to FIGS. FIG. 7 shows a power measurement system 110 in which a power detector 150 is arranged instead of the generator 50 in the small wave power generation system 10. In the power measurement system 110, in addition to the breakwater 20, the water wheel 30, and the rotation shaft 40, a power detector 150 that measures the torque and rotation speed of rotation by the rotation shaft 40, an amplifier 160, a controller 170, and a wave height meter 180a. , 180b. The power detector 150 measures the torque and rotational angular velocity of the rotating shaft 40 in a state where a load is applied to the rotating shaft 40 by friction. Here, a personal computer is used as the controller 170.

  In addition, here, the breakwater 20 is modeled on a breakwater installed in Osaka Minami Port, and is about 1/12 of the size. The horizontal length of the slit 20s of the breakwater 20 and the thickness of the slit 20s are as follows. The thickness and spacing are 42 mm, 42 mm, and 142 mm, respectively. Such a breakwater 20 is installed in a wave-making water tank. In the wave tank, the length along the direction orthogonal to the wave traveling direction is 500 mm, the length along the wave traveling direction is 20 m, and the water has a depth of 417 mm.

  The water turbine 30 is disposed across the slit 20s and the water basin 20t of the breakwater 20, and the water turbine 30 rotates according to the reciprocating flow formed in the vicinity of the slit 20s. A Savonius type water wheel is used as the water wheel 30. Here, the diameter and length of the water wheel 30 are 35 mm and 130 mm, respectively. Here, the water turbine 30 includes three water wheel portions 130a, 130b, and 130c. The three water turbine units 130a, 130b, and 130c are arranged with their water turbine blades shifted from each other by 120 ° with respect to the rotation axis, thereby realizing smooth rotation.

  The wave height meter 180a is disposed at a position of 60 mm forward (offshore side) from the breakwater 20, and the wave height meter 180b is disposed at a position of 5 m forward (offshore side) from the breakwater 20.

The wave generator generates waves under the conditions shown in Table 1. The wave height H is twice the amplitude of the wave, and the waveform gradient γ is expressed as H / λ using the wavelength λ and the wave height H.

  FIG. 8A to FIG. 8D show temporal changes in the liquid level displacement h, angular velocity ω, torque T, and power P, respectively. The liquid level displacement h before wave formation is zero. Further, here, the wave is formed so that the period C is 1.44 seconds and the waveform gradient γ is 0.03.

  When the liquid level displacement h in the vicinity of the slit 20s is large, water flows into the reclaimed water chamber 20t through the slit 20s, and when it is small, water flows out of the reclaimed water chamber 20t through the slit 20s. 8A to 8D, the absolute value of the liquid level displacement h is large, and when there is a strong inflow / outflow, the angular velocity W, torque T, and power P show large values, while the liquid level displacement When h is near 0, these values are small, and it can be seen that the water turbine 30 exhibits intermittent rotational motion.

In FIG. 9 (a), it shows the time variation of the average angular speed omega _a and the average power _{P a} to the average torque _{T a.} Average torque T _a, the average angular speed omega _a and the average power P _a, modify the frictional load torque referring to acquire data similar to that described above to 8, torque, angular velocity, the time average value of the power It is what I have requested.

As understood from FIG. 9 (a), the case where the average torque T _a is increased, while the average angular speed omega _a decreases monotonously, the average power P _a is decreased after increased once. Here, the average power _{P a} when the average torque _{T a} is 74.7μNm indicates the maximum value 955MyuW. In general, it is known that the efficiency of the Savonius turbine is maximized when the peripheral speed of the turbine becomes almost the same as the flow velocity, and the peripheral speed of the turbine at the time of maximum power also approximately satisfies this condition.

FIG. 9B shows a change in the maximum average power P _{amax with} respect to the waveform gradient γ. Here, the maximum average power P _amax is similarly obtained by changing the waveform gradient γ while the period C is fixed at 1.15 seconds and 1.44 seconds. FIG. 9B shows that the maximum average power P _amax increases with the waveform gradient γ. This is thought to be due to the increase in the speed of flow due to the wave. It can also be seen that the maximum average power _Pamax tends to increase somewhat as the period C increases. As described above, it is understood that the power is appropriately acquired by the water flow reciprocating through the slit 20s.

  According to the present invention, wave power generation can be efficiently performed using a wave power generation system that is easy to install. The wave power generation system of the present invention can suitably supply electric power to general houses in harbors, fishing facilities, and ship navigation support facilities. In addition, the wave power generation system of the present invention can be used as a power supply source in areas where power transmission is difficult, such as remote islands, or can be used as a power generation system when a normal transmission line becomes unavailable during a disaster or the like It is.

DESCRIPTION OF SYMBOLS 10 Wave power generation system 20 Breakwater 20s Slit 20t Reservoir 30 Water turbine 40 Rotating shaft 50 Generator

Claims (11)

Breakwater,
A water wheel provided on the breakwater;
A rotating shaft that rotates in conjunction with the rotation of the water wheel;
A generator that generates power with the rotation of the rotating shaft,
The breakwater is provided with a slit and a water reserving room communicating with the slit,
The water wheel is provided in at least one of the slit and the water reservoir ;
The length along the horizontal direction of the slit is shorter than the length along the vertical direction of the slit,
The wave power generation system, wherein the rotation axis is arranged along a vertical direction .   The said water wheel is comprised so that it can rotate according to both the flow of the water which flows in into the said water reserving chamber through the said slit, and the flow of water which flows out of the said water reserving chamber through the said slit. 1. The wave power generation system according to 1.   The wave power generation system according to claim 1, wherein the water turbine includes a plurality of water turbine units that rotate the rotating shaft. Each of the plurality of turbine parts has a turbine blade,
The wave power generation system according to claim 3, wherein the water turbine blades of the plurality of water turbine units are arranged at different positions with respect to the rotation shaft.   The plurality of turbine parts include a first turbine part having a first turbine blade, a second turbine part having a second turbine blade disposed at a position approximately 120 ° different from the first turbine blade, 5. The wave power generation system according to claim 4, further comprising: a third turbine unit having a third turbine blade disposed at a position different from the two turbine blades by approximately 120 °.   The wave power generation system according to any one of claims 1 to 5, wherein a length of the slit along the horizontal direction is shorter than a length of the water chamber along the horizontal direction. Length along the length and the vertical direction along the horizontal direction of the slit corresponds to the length along the length and the vertical direction along the horizontal direction of the water wheel, any of claims 1 to 6 The wave power generation system according to Crab. The waterwheel includes a Savonius type hydraulic turbine, wave power generation system according to any one of claims 1 to 7. The breakwater has a front surface provided with the slit;
Length along the horizontal direction of the slit is less than half the length along the horizontal direction of the portion not provided with the slits of the front surface of the breakwater, in any one of claims 1 to 8 The described wave power generation system. The breakwater is provided with a plurality of slits and a plurality of water chambers communicating with the plurality of slits, respectively.
The wave power generation system further comprises a plurality of water wheels corresponding to the plurality of slits, wave power generation system according to any one of claims 1 to 9. Wherein the plurality of slits, the plurality of retarding chamber and the plurality of water wheels are arranged in a horizontal direction, wave power generation system according to any one of claims 1 to 10.