JP7029796B2 - Wave power generation system - Google Patents

Description

The present invention relates to a wave power generation system that generates power using waves.

A floating wave power generation system (floating wave power generation device: FWEC) is installed in the ocean or the like and uses the energy of waves to generate power.
For example, Patent Document 1 includes a power conversion system having a float, a spar, and a power extraction device (PTO), and wave energy in which a heave plate is attached to each of the middle and lower parts of the spar via a rod, a pipe, or the like. The converter is disclosed.
Further, Patent Document 2 includes an annular float, a spar float, and a power take-out device, and has a streamlined vertically extending structure at the end of a damping plate (heave plate) arranged at the lower end of the spar float. The provided wave energy converter is disclosed.
Further, in Patent Document 3, in a floating marine structure composed of a lower hull as a disk-shaped floating body and a cylindrical column, the lower hull is fixed diagonally downward to the lower hull while maintaining a gap with the outer peripheral portion. It is disclosed that a spreading fin, a thruster that generates thrust in the vertical direction, a block that can be taken in and out in the outer direction of the lower hull, and the like are provided.
Further, in Patent Document 4, a plate-shaped power generation device that connects a plurality of floating bodies floating on the sea surface to generate electricity by deformation, and a plurality of radial plate-shaped bodies having one end connected to a support installed under the sea surface. A power generation device with a hanging lotus having a power generation device of the above is disclosed.

Special Table 2009-535565 Special Table 2009-535566 Gazette Japanese Unexamined Patent Publication No. 6-56074 Japanese Unexamined Patent Publication No. 2012-237264

One of the power generation mechanisms (PTO) used in a wave power generation system is a linear power generation mechanism (linear PTO) which has advantages such as quick control response and less man-hours for conversion to electric energy.
Since the linear power generation mechanism produces electric power by the principle of electromagnetic induction using the relative motion of the float and spar, it can generate electricity efficiently under the condition that the motion speed of the float is fast, but the length is 10 seconds or more. Under conditions where the motion speed of the floating body is slow, such as when a periodic wave arrives, the power generation efficiency drops. Therefore, the conventional linear power generation mechanism can hardly recover the energy of the long-period wave.
Here, Patent Document 1 improves the stability and power conversion efficiency of the wave energy converter by firmly attaching the heave plate to the spar with a rod, a pipe, or the like to facilitate the movement of the spar and the float in different phases. However, it does not recover and utilize the energy of long-period waves as a wave energy converter.
Further, Patent Document 2 attempts to minimize the resistance force associated with the use of the damping plate by providing a streamlined structure at the end of the damping plate, but it is long as a wave energy converter. It does not recover and utilize the energy of periodic waves.
Further, Patent Document 3 aims to reduce the sway of a floating marine structure used in leisure facilities, hotels, etc. by providing fins or the like in the lower hull, and recovers and uses the energy of the waves. It's not a thing.
Further, Patent Document 4 attempts to improve the power generation efficiency of a power generation device installed in the ocean by using a plurality of floating bodies and power generation devices, but the energy of a long-period wave as a power generation device is used. It is not intended to be collected and used. In addition, it is necessary to float multiple floating bodies in the sea, which makes the configuration and control large.

Therefore, an object of the present invention is to provide a highly efficient wave power generation system that can recover and utilize the energy of a long-period wave.

In the wave power generation system corresponding to the first aspect, the floating body portion, the spar portion, and the power generation means are provided, and the spar portion is used to increase the relative motion speed of the floating body portion and the spar portion with respect to the incident wave. It is a wave power generation system having an overhanging means provided at the bottom, and the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy accompanying the movement of the movable means, and the overhanging means is provided. It has a plate shape, and the movable means makes a part of the plate-shaped overhanging means movable, or the movable means makes the whole of the plate-shaped overhanging means movable, and the overhanging means is a spar portion. It is characterized by having a heave plate fixedly provided on the heave plate and a plate-shaped flap means provided on the heave plate as a movable means .
According to the first aspect of the present invention, as a wave power generation system, it is possible to efficiently generate power in the vicinity of a wave cycle that frequently occurs in the installed sea area, and it is possible to recover the energy of a long-period wave. It can be utilized to improve the efficiency of the wave power generation system. Further, by utilizing the water flow generated by the vertical movement of the spar portion and the vertical movement of the entire spar portion, the energy of the long-period wave can be efficiently recovered by the plate-shaped overhanging means having a simple structure. In addition, the energy of long-period waves can be recovered by utilizing the movement of the plate-shaped flap means. Further, due to the fluid resistance generated by the flap means, the relative motion between the floating body portion and the spar portion can be further increased.

The present invention according to claim 2 is characterized in that the flap means is a plurality of movable flaps provided around the heave plate, and the energy recovery means recovers the movement of the movable flaps as hydraulic energy.
According to the second aspect of the present invention, by using the flap means, which is a movable means, as a movable flap, the movement of the flap means can be increased, and more energy of a long-period wave can be easily recovered. Further, by recovering the movement of the movable flap as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

In the wave power generation system corresponding to the third aspect, the floating body portion, the spar portion, and the power generation means are provided, and the spar portion is used to increase the relative motion speed of the floating body portion and the spar portion with respect to the incident wave. It is a wave power generation system having an overhanging means provided at the bottom, and the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy accompanying the movement of the movable means, and the overhanging means is provided. It has a plate shape, and the movable means makes a part of the plate-shaped overhanging means movable, or the movable means makes the whole of the plate-shaped overhanging means movable, and the overhanging means is a spar portion. On the other hand, it is characterized by having a moving plate capable of translational movement as a whole and a supporting means for supporting the moving plate so as to be movable in the vertical direction as a movable means.
According to the third aspect of the present invention, as a wave power generation system, it is possible to efficiently generate power in the vicinity of a wave cycle that frequently occurs in the installed sea area, and it is possible to recover the energy of a long-period wave. It can be utilized to improve the efficiency of the wave power generation system. Further, by utilizing the water flow generated by the vertical movement of the spar portion and the vertical movement of the entire spar portion, the energy of the long-period wave can be efficiently recovered by the plate-shaped overhanging means having a simple structure. In addition, the energy of long-period waves can be recovered by utilizing the vertical movement of the moving plate. In addition, the fluid resistance generated by the moving plate can further increase the relative motion between the floating body portion and the spar portion.

According to the fourth aspect of the present invention, the support means is a linear motion hydraulic cylinder in which the moving plate is connected to the spar portion via the universal joint means, and the energy recovery means is the hydraulic energy of the movement of the linear motion hydraulic cylinder. It is characterized in that it is collected as.
According to the fourth aspect of the present invention, the supporting means, which is a movable means, is a linear hydraulic cylinder in which the moving plate is connected to the spar portion via the universal joint means, so that the moving plate can be moved in the vertical direction. It becomes easier to absorb movement, and it becomes easier to recover more energy of long-period waves. Further, by recovering the movement of the direct-acting hydraulic cylinder as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

According to the fifth aspect of the present invention, the supporting means for supporting the moving plate is a linear motion hydraulic cylinder fixedly connected to the spar portion, and the energy recovery means hydraulically energy the movement of the linear motion hydraulic cylinder. It is characterized in that it is collected as a cylinder.
According to the fifth aspect of the present invention, by using a linear motion hydraulic cylinder fixedly connected to the spar portion as the support means which is a movable means, it is easy to absorb the vertical movement of the moving plate. Therefore, it becomes easier to recover more energy of long-period waves. Further, by recovering the movement of the direct-acting hydraulic cylinder as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

In the wave power generation system corresponding to the sixth aspect, the floating body portion, the spar portion, and the power generation means are provided, and the spar portion is used to increase the relative motion speed of the floating body portion and the spar portion with respect to the incident wave. It is a wave power generation system having an overhanging means provided at the bottom, and the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy accompanying the movement of the movable means, and the overhanging means is provided. It has a plate shape, and the movable means makes a part of the plate-shaped overhanging means movable, or the movable means makes the whole of the plate-shaped overhanging means movable, and the overhanging means is entirely movable. It is characterized by having a working flap means forming a plate shape that can rotate around the shaft and a rotation mechanism provided on the shaft as a movable means.
According to the sixth aspect of the present invention, as a wave power generation system, it is possible to efficiently generate power in the vicinity of a wave cycle that frequently occurs in the installed sea area, and it is possible to recover the energy of a long-period wave. It can be utilized to improve the efficiency of the wave power generation system. Further, by utilizing the water flow generated by the vertical movement of the spar portion and the vertical movement of the entire spar portion, the energy of the long-period wave can be efficiently recovered by the plate-shaped overhanging means having a simple structure. In addition, the energy of long-period waves can be recovered by utilizing the movement of the plate-shaped operating flap means. Further, the relative motion between the floating body portion and the spar portion can be further increased due to the fluid resistance generated by the operating flap means.

The present invention according to claim 7 is characterized in that the rotation mechanism is a hydraulic rotation mechanism, and the energy recovery means recovers the movement of the hydraulic rotation mechanism as hydraulic energy.
According to the seventh aspect of the present invention, by recovering the movement of the hydraulic rotation mechanism accompanying the rotation of the flap means as hydraulic energy, the recovered energy can be stored and used in a hydraulic device. It will be easier .

The present invention according to claim 8 is characterized in that the energy recovery means includes a pressure storage means for storing the recovered hydraulic energy.
According to the eighth aspect of the present invention, the recovered hydraulic energy is stored in the accumulator means and can be easily used at an arbitrary timing. Further, smoothing becomes possible when the hydraulic pressure fluctuates due to the pressure accumulating means.

The present invention according to claim 9 is characterized in that the energy recovery means includes a hydraulic control means that controls the use of hydraulic energy stored in the accumulator means based on the relative motion speed.
According to the ninth aspect of the present invention, the recovered hydraulic pressure is generated by using the hydraulic energy stored in the accumulator means when the relative motion speed between the floating body portion and the spar portion with respect to the incident wave decreases, for example. Energy can be used more effectively.

The present invention according to claim 10 is characterized in that the power generation means is a hydraulic linear power generation mechanism.
According to the tenth aspect of the present invention, the power generation means can be made to perform a quick control response, and the man-hours for conversion to electric energy can be reduced. Further, by using a hydraulic linear power generation mechanism, the degree of freedom of installation is increased, and the spar portion can be installed at any place, for example.

The present invention according to claim 11 is characterized in that the recovered hydraulic energy is guided to a hydraulic linear power generation mechanism for use.
According to the eleventh aspect of the present invention, the recovered hydraulic energy can be used to assist the linear power generation mechanism, so that the efficiency of the wave power generation system can be improved. Further, since the hydraulic energy recovered by the energy recovery means can be used in combination with the linear power generation mechanism as the power generation means, the configuration can be simplified.

The invention according to claim 12 is characterized in that the relative motion speed of the floating body portion and the spar portion is controlled by using the power generation means.
According to the twelfth aspect of the present invention, since the power generation means itself can be used to adjust the relative motion speed between the floating body portion and the spar portion to improve the efficiency of the wave power generation system, it is special. No means of controlling relative motion velocity is required.

The present invention according to claim 13 utilizes the energy recovered by the energy recovery means for controlling the relative motion speed of the floating body portion and the spar portion.
According to the thirteenth aspect of the present invention, the efficiency of the wave power generation system can be further improved by using the recovered energy for control.

The present invention according to claim 14 is characterized in that a plurality of overhanging means and energy recovery means are provided in the vertical direction of the spar portion.
According to the thirteenth aspect of the present invention, more energy of a long-period wave can be recovered.

According to the wave power generation system of the present invention, as a wave power generation system, it is possible to efficiently generate power in the vicinity of the wave cycle that frequently occurs in the installed sea area, and it is possible to recover the energy of long-period waves, so this energy is utilized. Therefore, the efficiency of the wave power generation system can be improved. Further, by utilizing the water flow generated by the vertical movement of the spar portion and the vertical movement of the entire spar portion, the energy of the long-period wave can be efficiently recovered by the plate-shaped overhanging means having a simple structure. In addition, the energy of long-period waves can be recovered by utilizing the movement of the plate-shaped flap means. Further, due to the fluid resistance generated by the flap means, the relative motion between the floating body portion and the spar portion can be further increased.

Further , the flap means are a plurality of movable flaps provided around the heave plate, and the energy recovery means means that the flap means, which is a movable means, is referred to as a movable flap when the movement of the movable flap is recovered as hydraulic energy. By doing so, the movement of the flap means can be increased, and it becomes easier to recover more energy of the long-period wave. Further, by recovering the movement of the movable flap as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

Further, the wave power of the present invention is configured such that the overhanging means has a moving plate capable of translational movement as a whole with respect to the spar portion, and a supporting means for supporting the moving plate so as to be movable in the vertical direction as a movable means. According to the power generation system, the energy of the long-period wave can be recovered by using the vertical movement of the working plate. In addition, the fluid resistance generated by the moving plate can further increase the relative motion between the floating body portion and the spar portion.

Further, the support means is a linear motion hydraulic cylinder that connects the moving plate to the spar portion via the universal joint means, and the energy recovery means recovers the movement of the linear motion hydraulic cylinder as hydraulic energy. By using a linear hydraulic cylinder that connects the moving plate to the spar portion via a universal joint means, the supporting means, which is a movable means, makes it easier to absorb the vertical movement of the moving plate and has a long cycle. It will be easier to recover more of the energy of the waves. Further, by recovering the movement of the direct-acting hydraulic cylinder as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

Further, when the supporting means for supporting the operating plate is a linear motion hydraulic cylinder fixedly connected to the spar portion, and the energy recovery means recovers the movement of the linear motion hydraulic cylinder as hydraulic energy. By using a linear hydraulic cylinder that is fixedly connected to the spar portion as a support means that is a movable means, it becomes easier to absorb the vertical movement of the moving plate, and the energy of long-period waves. Will be easier to collect. Further, by recovering the movement of the direct-acting hydraulic cylinder as hydraulic energy, the recovered energy can be stored and it becomes easy to use it for hydraulic equipment.

Further , according to the wave power generation system of the present invention , the overhanging means has a working flap means having a plate-like shape that can rotate around the shaft as a whole, and a rotation mechanism provided on the shaft as a movable means. , The energy of long-period waves can be recovered by utilizing the movement of the plate-shaped moving flap means. Further, the relative motion between the floating body portion and the spar portion can be further increased due to the fluid resistance generated by the operating flap means.

Further, when the rotation mechanism is a hydraulic rotation mechanism and the energy recovery means recovers the movement of the hydraulic rotation mechanism as hydraulic energy, the movement of the hydraulic rotation mechanism accompanying the rotation of the flap means is used as hydraulic energy. By recovering, it becomes possible to store the recovered energy and it becomes easier to use it for hydraulic equipment .

Further , when the energy recovery means has a pressure storage means for storing the recovered hydraulic energy, the recovered hydraulic energy is stored in the pressure storage means and can be easily used at an arbitrary timing. Further, smoothing becomes possible when the hydraulic pressure fluctuates due to the pressure accumulating means.

Further, when the energy recovery means has a hydraulic control means for controlling the use of the hydraulic energy stored in the accumulator means based on the relative motion speed, for example, the relative motion speed between the floating body portion and the spar portion with respect to the incident wave. The recovered hydraulic energy can be used more effectively, such as generating electricity by using the hydraulic energy stored in the pressure accumulating means when the pressure drops.

Further, when the power generation means is a hydraulic linear power generation mechanism, the power generation means can be made to perform a quick control response and the man-hours for conversion to electric energy can be reduced. Further, by using a hydraulic linear power generation mechanism, the degree of freedom of installation is increased, and the spar portion can be installed at any place, for example.

In addition, when the recovered hydraulic energy is guided to a hydraulic linear power generation mechanism for use, the recovered hydraulic energy can be used to assist the linear power generation mechanism, thus improving the efficiency of the wave power generation system. Can be made to. Further, since the hydraulic energy recovered by the energy recovery means can be used in combination with the linear power generation mechanism as the power generation means, the configuration can be simplified.

When controlling the relative motion speed between the floating body portion and the spar portion by using the power generation means, the relative motion speed between the floating body portion and the spar portion is adjusted by using the power generation means itself to generate wave power. Since the efficiency of the system can be improved, no special means for controlling the relative motion velocity is required.

In addition, when the energy recovered by the energy recovery means is used to control the relative motion speed of the floating body part and the spar part, the efficiency of the wave power generation system can be further improved by using the recovered energy for control. can.

Further, when a plurality of overhanging means and energy recovery means are provided in the vertical direction of the spar portion, more energy of the long-period wave can be recovered.

Schematic external view of the wave power generation system of this embodiment The figure which shows the wave power generation system by the 1st Example The figure which shows the wave power generation system by the 2nd Example of the same The figure which shows the wave power generation system by the 3rd Example of the same The figure which shows the wave power generation system by the 4th Example of the same The figure which shows the wave power generation system by the 5th Example of the same A perspective view showing a modified example of the wave power generation system according to the fifth embodiment. The figure which shows the wave power generation system by the 6th Example of the same

The wave power generation system according to the embodiment of the present invention will be described below.
FIG. 1 is a schematic external view of the wave power generation system of the present embodiment.
In FIG. 1, an annular floating body portion 10, a columnar spar portion 20, and a spar portion 20 are provided so as to project from the lower portion in order to increase the relative motion speed between the floating body portion 10 and the spar portion 20 with respect to an incident wave. It shows a state in which a wave power generation system equipped with an overhanging means 30 is installed in the ocean.
A floating body portion 10 having a diameter larger than that of the spar portion 20 is fitted to the upper outer peripheral surface of the spar portion 20 so as to be movable in the vertical direction.
The floating body portion 10 is located on the water surface, and the spar portion 20 is erected in a state where most of the spar portion 20 is submerged in water. The upper end of the spar portion 20 is above the water surface.
Further, a power generation means 40 (see FIG. 2) connected to the floating body portion 10 is incorporated in the spar portion 20, and power generation is performed by utilizing the relative motion between the floating body portion 10 and the spar portion 20.

The floating body portion 10 and the spar portion 20 are designed to increase the relative motion between the floating body portion 10 and the spar portion 20. That is, the floating body portion 10 has a natural period set so that power can be efficiently generated in the vicinity of the wave period that frequently occurs in the sea area where the wave power generation system is installed in consideration of the control force. On the other hand, for the spar portion 20, a large overhanging means 30 is attached to the lower part to set a natural period shifted to a long period in order to suppress movement in the sea area, and the relative motion speed of the floating body portion 10 and the spar portion 20 is set. Is getting bigger.

As described above, especially when the power generation mechanism (power generation means 40) is a linear power generation mechanism, power is produced by the principle of electromagnetic induction, so that power is efficiently generated under the condition that the moving speed of the floating body portion 10 is high. However, the linear power generation mechanism is not suitable for continuously producing a large thrust against gradual fluctuations, and the motion speed of the floating body portion 10 is slow, such as when a wave with a long period of 10 seconds or more arrives. Under the conditions, the power generation efficiency will decrease.
Therefore, in the wave power generation system of the present embodiment, the overhanging means 30 is provided with a movable means that moves by a long-period wave, and further, an energy recovery means that recovers the energy associated with the movement of the movable means is provided.
As a result, it is possible to efficiently generate electricity in the vicinity of the wave cycle that frequently occurs in the sea area where it is installed as a wave power generation system, and it is possible to recover the energy of long-period waves. Can be improved.
Hereinafter, an example of a wave power generation system including an overhanging means and an energy recovery means according to the present embodiment will be described.

2A and 2B are views showing a wave power generation system according to the first embodiment, FIG. 2A is a top view, and FIG. 2B is a front view. Note that FIG. 2B also shows a part of the equipment arranged inside.
In the wave power generation system according to the present embodiment, the floating body portion 10 (not shown in FIG. 2), the spar portion 20, the overhanging means 30 provided overhanging the lower part of the spar portion 20, and the inside of the spar portion 20. It has an arranged power generation means 40.
The overhanging means 30 has a plate shape and has a plate-shaped heave plate 131 fixed to the lower end of the spar portion 20 and a plate-shaped flap means 132 provided on the heave plate 131. The heave plate 131 has a larger diameter than the spar portion 20 and is formed in a hexagonal shape when viewed from above.
The power generation means 40 is arranged in the spar portion 20 erected in the ocean, and generates power by utilizing the relative motion between the floating body portion 10 and the spar portion 20.
The power generation means 40 is a linear power generation mechanism provided with a hydraulic auxiliary power generation mechanism. By using the linear power generation mechanism, the power generation means 40 can be made to perform a quick control response, and the man-hours for conversion to electric energy can be reduced. Further, by adopting a linear power generation mechanism provided with a hydraulic auxiliary power generation mechanism, the degree of freedom of installation is increased, and for example, the power generation means 40 can be installed at an arbitrary place of the spar portion 20.
Further, in the wave power generation system of the present embodiment, the power generation means 40 is used as an electric motor to control the relative motion speed of the floating body portion 10 and the spar portion 20. As a result, the relative motion speed between the floating body portion 10 and the spar portion 20 can be adjusted by using the power generation means 40 itself to improve the efficiency of the wave power generation system, and thus the control means for controlling the relative motion speed. There is no need to provide a separate.
The floating body portion 10 is set with a natural period that enables efficient power generation in the vicinity of a wave period that frequently occurs in the sea area where a wave power generation system is installed in consideration of control force. On the other hand, the spar portion 20 is provided with a heave plate 131 at the lower part to set a natural period shifted to a long period in order to suppress the motion in the sea area, and the relative motion of the floating body portion 10 and the spar portion 20 with respect to the incident wave. The speed is increasing.

The movable means in the wave power generation system of this embodiment is a plate-shaped flap means 132 provided around the heave plate 131. A part of the overhanging means 30 is movable by the flap means 132. The wave power generation system can recover the energy of a long-period wave by utilizing the movement of the flap means (movable means) 132. Further, the relative motion between the floating body portion 10 and the spar portion 20 can be further increased by the fluid resistance generated by the flap means 132.
The flap means 132 includes a plurality of movable flaps provided so as to project outward from each side of the heave plate 131. The rear end of the flap means 132 is connected to a hinge 50 provided inside the heave plate 131, and the flap means 132 can rotate up and down about the hinge 50. By configuring the flap means 132 with a movable flap, the movement of the flap means 132 can be increased, and it becomes easier to recover more energy of the long-period wave.
The heave plate 131 is formed in a regular hexagonal shape in a top view in order to facilitate the installation and operation of the flap means 132 composed of a plurality of movable flaps, but it should be formed in another polygonal shape or a circular shape. You can also.

An energy recovery means 60 is connected to the flap means 132. The energy recovery means 60 includes a linear acting hydraulic cylinder 61, a pressure accumulating means 62, and a hydraulic control means 63. The hydraulic cylinder 61, the accumulator means 62, and the hydraulic control means 63 are arranged inside the spar portion 20.
The rear end of each movable flap of the flap means 132 is connected to the hydraulic cylinder 61 via a hinge 50. The hydraulic cylinder 61 is driven by utilizing the rotational operation of the movable flap. The hydraulic cylinder 61 can also be configured by using a rotary type.
When the wave incident on the wave power generation system shifts from the cycle in which the power generation means (linear power generation mechanism) 40 efficiently generates power to the long-period side, the spar portion 20 moves up and down due to the long-period wave, and the flap is accompanied by it. The means 132 (movable flap) rotates. The energy recovery means 60 recovers the movement of the flap means 132 as hydraulic energy by the hydraulic cylinder 61. In this way, by utilizing the water flow generated by the vertical movement of the spar portion 20 and the vertical movement of the entire spar portion 20, the energy of the long-period wave can be efficiently recovered by the plate-shaped overhanging means 30 having a simple structure. Can be done. Further, by recovering as hydraulic energy, the recovered energy can be stored in the pressure accumulating means 62, which makes it easy to use for hydraulic equipment. Further, by storing in the pressure accumulating means 62, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed by the pressure accumulating means 62.
The accumulator means 62 and the hydraulic control means 63 are connected to a hydraulic auxiliary power generation mechanism 70 arranged at the lower part of the spar portion 20. The hydraulic control means 63 supplies the hydraulic energy stored in the accumulator means 62 to the hydraulic auxiliary power generation mechanism 70 when the relative motion speed of the floating body portion 10 and the spar portion 20 with respect to the incident wave becomes small. The linear power generation mechanism 40 is assisted.

In this way, the energy of the long-period wave is recovered and stored as hydraulic energy by using a plurality of flap means 132 (movable flaps) and energy recovery means 60 provided around the heave plate 131, and is hydraulically operated. By assisting the linear power generation mechanism 40 by using the auxiliary power generation mechanism 70, the power generation efficiency of the wave power generation system can be improved. Further, since the hydraulic energy recovered by the energy recovery means 60 can be used in combination with the linear power generation mechanism which is the power generation means 40, the configuration of the wave power generation system can be simplified.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.

3A and 3B are views showing a wave power generation system according to a second embodiment, FIG. 3A is a top view, and FIG. 3B is a front view. The same functional members as those of the wave power generation system according to the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The wave power generation system according to this embodiment includes a floating body portion 10 (not shown in FIG. 3), a spar portion 20, a plate-shaped overhanging means 30 provided at the lower part of the spar portion 20, and a spar portion 20. It has an arranged power generation means 40 (not shown in FIG. 3).
The overhanging means 30 has a plate-shaped moving plate 231 that can translate as a whole with respect to the spar portion 20, and a supporting means 232 that supports the moving plate 231 so as to be movable in the vertical direction as a movable means. The 232 is configured to make the entire overhanging means 30 movable.
The working plate 231 has a diameter larger than that of the spar portion 20 and is formed in a regular hexagonal polygonal shape when viewed from above, and has an opening 231A inside. The working plate 231 can also be formed into another polygon or a circle. The spar portion 20 is erected in a state of penetrating the central portion of the opening 231A of the operating plate 231, and the lower end of the spar portion 20 is located below the operating plate 231.
The moving plate 231 can also be installed below the spar portion 20, that is, so that the lower end of the spar portion 20 is located above the working plate 231.

In the present embodiment, the movable means is a support means 232 that movably supports the moving plate 231 to the spar portion 20 in the vertical direction, and the wave power generation system utilizes the vertical movement of the moving plate 231. The energy of long-period waves can be recovered. Further, the relative motion between the floating body portion 10 and the spar portion 20 can be further increased by the fluid resistance generated by the moving plate 231.
The support means 232 includes three direct-acting hydraulic cylinders that connect the moving plate 231 to the spar portion 20 via the universal joint means 233. By configuring the support means 232 by using a direct acting hydraulic cylinder that connects the moving plate 231 to the spar portion 20 via the universal joint means 233, it becomes easier to absorb the vertical movement of the working plate 231 and the length becomes longer. It becomes easier to recover more energy of the periodic wave.
The three direct-acting hydraulic cylinders, which are the supporting means 232, are arranged at predetermined intervals in the circumferential direction with respect to the spar portion 20, and one end of each linear-acting hydraulic cylinder is the moving plate 231 of the spar portion 20. It is connected to the universal joint means 233 arranged on the outer periphery above, and the other end of each linear motion hydraulic cylinder is connected to the universal joint means 233 arranged on the outer periphery of the operating plate 231. In the direct-acting hydraulic cylinder, the piston reciprocates in the vertical direction as the moving plate 231 moves up and down. Two or four or more direct-acting hydraulic cylinders may be arranged.

The support means 232 (linear hydraulic cylinder) includes an energy recovery means 60 (not shown in FIG. 3) provided with a pressure accumulating means 62 (not shown in FIG. 3) and a hydraulic control means 63 (not shown in FIG. 3). It is connected.
When the wave incident on the wave power generation system shifts from the cycle in which the linear power generation mechanism efficiently generates power to the long cycle side, the long cycle wave causes the relative motion in the translational / rotational direction between the spar portion 20 and the operating plate 231. Occurs. The working plate 231 increases the relative motion speed between the spar portion 20 and the working plate 231 by damming water with a rising plate (resistance increasing end plate) 234 extending in the vertical direction at the outer peripheral end.
The energy recovery means 60 recovers the movement of the linear motion hydraulic cylinder driven by the relative motion between the spar portion 20 and the operating plate 231 as hydraulic energy. By recovering as hydraulic energy, the recovered energy can be stored in the pressure accumulating means 62, and it becomes easy to use it for hydraulic equipment. Further, by storing in the pressure accumulating means 62, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed by the pressure accumulating means 62.
The accumulator means 62 and the hydraulic control means 63 are connected to a hydraulic auxiliary power generation mechanism 70 (not shown in FIG. 3). The hydraulic control means 63 supplies the hydraulic energy stored in the accumulator means 62 to the hydraulic auxiliary power generation mechanism 70 when the relative motion speed between the floating body portion 10 and the spar portion 20 with respect to the incident wave becomes small. , Auxiliary linear power generation mechanism 40.

In this way, the energy of the long-period wave is hydraulically energyed by using the support means 232 (linear-acting hydraulic cylinder) for connecting the operating plate 231 to the spar portion 20 via the universal joint means 233 and the energy recovery means 60. The power generation efficiency of the wave power generation system can be improved by assisting the linear power generation mechanism 40 by using the hydraulic auxiliary power generation mechanism 70. Further, since the hydraulic energy recovered by the energy recovery means 60 can be used in combination with the linear power generation mechanism which is the power generation means 40, the configuration of the wave power generation system can be simplified.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.

FIG. 4 is a front view showing the wave power generation system according to the third embodiment, and shows the lower part of the spar portion and a part of the overhanging means. The same functional members as those of the wave power generation system according to the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The wave power generation system according to this embodiment includes a floating body portion 10 (not shown in FIG. 4), a spar portion 20, a plate-shaped overhanging means 30 provided at the lower part of the spar portion 20, and a spar portion 20. It has an arranged power generation means 40 (not shown in FIG. 4).
The overhanging means 30 has a plate-shaped moving plate 331 that can translate as a whole with respect to the spar portion 20, and a supporting means 332 that movably supports the moving plate 331 as a movable means in the vertical direction. The base of the 332 is fixedly connected to the spar portion 20, and the overhanging means 30 is made movable as a whole.
The working plate 331 has a diameter larger than that of the spar portion 20 and is formed in a circular or polygonal shape when viewed from above, and has an opening 331A inside. The spar portion 20 is erected in a state of penetrating the central portion of the opening 331A of the operating plate 331, and the lower end of the spar portion 20 is located below the operating plate 331.

In this embodiment, the movable means is a support means 332 that movably supports the moving plate 331 to the spar portion 20 in the vertical direction, and the wave power generation system utilizes the vertical movement of the moving plate 331. The energy of long-period waves can be recovered. The arrow X in the figure indicates the moving direction of the moving plate 331.
The support means 332 that supports the operation plate 331 includes a plurality of linear motion hydraulic cylinders that are fixedly connected to the spar portion 20. By configuring the support means 332 using a linear motion hydraulic cylinder fixedly connected to the spar portion 20, it becomes easier to absorb the vertical movement of the operating plate 331, and the energy of the long-period wave can be further absorbed. It will be easier to collect more.
A plurality of direct-acting hydraulic cylinders, which are the supporting means 332, are arranged on the outer periphery of the lower portion of the spar portion 20 at predetermined intervals in the circumferential direction so as to sandwich the operating plate 331 from above and below, and accompany the vertical movement of the operating plate 331. The piston reciprocates in the vertical direction.

The support means 232 (linear hydraulic cylinder) includes an energy recovery means 60 (not shown in FIG. 4) provided with a pressure accumulating means 62 (not shown in FIG. 4) and a hydraulic control means 63 (not shown in FIG. 4). It is connected.
When the wave incident on the wave power generation system shifts from the period in which the linear power generation mechanism efficiently generates power to the long-period side, the long-period wave causes a relative motion between the spar portion 20 and the operating plate 331. In addition, in order to increase the vertical drag acting on the operating plate 331 and increase the relative motion between the spar portion 20 and the operating plate 331, a drag increasing end plate 333 extending in the vertical direction is provided at the outer peripheral end of the operating plate 331. It is provided.
The energy recovery means 60 recovers the movement of the linear motion hydraulic cylinder driven by the relative motion between the spar portion 20 and the operating plate 331 as hydraulic energy. By recovering as hydraulic energy, the recovered energy can be stored in the pressure accumulating means 62, and it becomes easy to use it for hydraulic equipment. Further, by storing in the pressure accumulating means 62, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed by the pressure accumulating means 62.
The accumulator means 62 and the hydraulic control means 63 are connected to a hydraulic auxiliary power generation mechanism 70 (not shown in FIG. 4). The hydraulic control means 63 supplies the hydraulic energy stored in the accumulator means 62 to the hydraulic auxiliary power generation mechanism 70 when the relative motion speed between the floating body portion 10 and the spar portion 20 with respect to the incident wave becomes small. , Auxiliary linear power generation mechanism 40.

In this way, the energy of the long-period wave is recovered as hydraulic energy by using the support means 332 (direct-acting hydraulic cylinder) and the energy recovery means 60 that fixedly connect the operating plate 331 to the spar portion 20. By storing and assisting the linear power generation mechanism 40 by using the hydraulic auxiliary power generation mechanism 70, the power generation efficiency of the wave power generation system can be improved. Further, since the hydraulic energy recovered by the energy recovery means 60 can be used in combination with the linear power generation mechanism which is the power generation means 40, the configuration of the wave power generation system can be simplified.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.

FIG. 5 is a diagram showing a wave power generation system according to a fourth embodiment, in which FIGS. 5 (a) and 5 (b) show the lower part of the spar portion and a part of the overhanging means, and FIG. 5 (c) shows. It shows a part of the overhanging means. The same functional members as those of the wave power generation system according to the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The wave power generation system according to this embodiment includes a floating body portion 10 (not shown in FIG. 5), a spar portion 20, a plate-shaped overhanging means 30 provided at the lower part of the spar portion 20, and a spar portion 20. It has an arranged power generation means 40 (not shown in FIG. 5).
The overhanging means 30 has a working flap means 431 having a plate shape that can rotate around the shaft 434 as a whole, and a rotating mechanism 432 provided on the shaft 434 as a movable means, and the rotating mechanism 432 has the overhanging means 30. It is configured to be movable in part or in whole.
The operating flap means 431 is arranged on the side of the spar portion 20, and is formed in a circular or polygonal shape when viewed from above. A predetermined gap 431A is provided between the spar portion 20 and the operating flap means 431. The working flap means 431 preferably has a divided structure configured to form a circular or polygonal shape when viewed from above by a plurality of working flaps. Further, the lower end of the spar portion 20 is located below the operating flap means 431. The operating flap means 431 may be installed below the spar portion 20, that is, so that the lower end of the spar portion 20 is located above the operating flap means 431.

In this embodiment, the movable means is a rotation mechanism 432 provided on the shaft 434, and the wave power generation system recovers the energy of the long-period wave by utilizing the movements of the operating flap means 431 and the rotation mechanism 432. can do. Further, the relative motion between the floating body portion 10 and the spar portion 20 can be further increased by the fluid resistance generated by the operating flap 431 means.
A drag increasing end plate 433 extending in the vertical direction is provided at the outer peripheral end of the operating flap means 431. The drag increasing end plate 433 is fixedly bonded to the spar portion 20 by a plurality of steel materials or coupling materials 80 such as wires.
Further, the rotation mechanism 432 is connected to an energy recovery means 60 (not shown in FIG. 5) including a pressure accumulating means 62 (not shown in FIG. 5) and a hydraulic control means 63 (not shown in FIG. 5).
The rotation mechanism 432 provided on the shaft 434 rotates with the rotation operation of the operating flap means 431.

In FIG. 5A, a rotation mechanism 432 is provided on a shaft 434 connected to a drag force increasing end plate 433 fixedly coupled to the spar portion 20 by a binder 80, and is arranged between the shaft 434 and the spar portion 20. The case where one end of the operating flap means 431 is connected to the shaft 434 is shown. The rotation mechanism 432 is a hydraulic rotation mechanism.
The other end of the working flap means 431 is a free end, and the working flap means 431 can rotate up and down about one end connected to the shaft 434.
Further, in FIG. 5B, a rotation mechanism 432 is provided on the shaft 434 coupled to the spar portion 20 by a coupling material 80 such as a plurality of steel materials or wires, and the rotation mechanism 432 is provided between the spar portion 20 and the shaft 434 and with the shaft 434. A case is shown in which one end of the operating flap means 431 arranged between the drag increasing end plate 433 and the working flap means 431 is connected to the shaft 434 and the other end is a free end. A predetermined gap 431A is also provided between the operating flap means 431 and the effect increasing plate 433. The rotation mechanism 432 is a hydraulic rotation mechanism. Note that FIG. 5C is a perspective view showing the operating flap means 431, the rotation mechanism 432, and the shaft 434.

In this embodiment, when the wave incident on the wave power generation system shifts from the cycle in which the linear power generation mechanism efficiently generates power to the long-period side, the spar portion 20 moves up and down due to the long-period wave, and the operating flap means. 431 rotates. The hydraulic rotation mechanism 432 operates in association with the rotation operation of the operating flap means 431. The energy recovery means 60 recovers the movement of the hydraulic rotation mechanism 432 as hydraulic energy. By recovering as hydraulic energy, the recovered energy can be stored in the pressure accumulating means 62, and it becomes easy to use it for hydraulic equipment. Further, by storing in the pressure accumulating means 62, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed by the pressure accumulating means 62.
The accumulator means 62 and the hydraulic control means 63 are connected to a hydraulic auxiliary power generation mechanism 70 (not shown in FIG. 5). The hydraulic control means 63 supplies the hydraulic energy stored in the accumulator means 62 to the auxiliary power generation mechanism 70 when the relative motion speed of the floating body portion 10 and the spar portion 20 with respect to the incident wave becomes small, and linear power generation is performed. Assist the mechanism.

In this way, the energy of the long-period wave is recovered and stored as hydraulic energy by using the rotation mechanism 432 provided on the shaft 434 and the energy recovery means 60, and is linearly operated by using the hydraulic auxiliary power generation mechanism 70. By assisting the power generation mechanism 40, the power generation efficiency of the wave power generation system can be improved. Further, since the hydraulic energy recovered by the energy recovery means 60 can be used in combination with the linear power generation mechanism which is the power generation means 40, the configuration of the wave power generation system can be simplified.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.
The recovered hydraulic energy can be guided to the pressure accumulating means 62 and the hydraulic control means 63 provided in the spar portion 20 via the piping provided in the coupling member 80. Further, the hydraulic rotation mechanism 432 can also be a direct power generation mechanism that directly generates power. In this case, electric power can be sent to the spar portion 20 via the wiring provided in the coupling material 80.

FIG. 6 is a diagram showing a wave power generation system according to a fifth embodiment, FIG. 6 (a) is a diagram showing a lower part of a spar portion and a part of an overhanging means, and FIG. 6 (b) is an enlargement of a movable means. It is a top view. Further, FIG. 7 is a perspective view showing a modified example of the wave power generation system according to the fifth embodiment. The same functional members as those of the wave power generation system according to the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The wave power generation system according to this embodiment includes a floating body portion 10 (not shown in FIG. 6), a spar portion 20, a plate-shaped overhanging means 30 provided at the lower part of the spar portion 20, and a spar portion 20. It has an arranged power generation means 40 (not shown in FIG. 6), and the overhanging means 30 has a turbine means 532 that makes a part of the overhanging means 30 movable as a movable means.
A plurality of turbine means 532 are provided on a plate-shaped plate 531 provided at the lower part of the spar portion 20. The plate 531 is formed in a circular or polygonal shape when viewed from above, and has an opening 531A inside. The spar portion 20 is erected so as to penetrate the central portion of the opening 531A of the plate 531 and the lower end of the spar portion 20 is located below the plate 531. The plate 531 may be installed below the spar portion 20, that is, so that the lower end of the spar portion 20 is located above the plate 531.

The turbine means 532 provided on the plate 531 as a movable means in the wave power generation system of this embodiment is a reciprocating flow type turbine. By using the reciprocating flow type turbine (wells turbine) blade, the water flow can be rotated in one direction regardless of whether the water flow flows into the turbine means 532 from either the upper or lower direction, and the energy recovery efficiency is improved. Further, the relative motion between the floating body portion 10 and the spar portion 20 can be further increased due to the fluid resistance generated by the reciprocating flow type turbine blade.
The wave power generation system can recover the energy of a long-period wave as a direct rotational motion by the turbine means 532 by utilizing the water flow generated by the vertical motion of the spar portion 20.
The turbine means 532 is fixedly coupled to the spar portion 20 by a plurality of steel materials or coupling materials 80 such as wires.
Further, a drag increasing end plate 533 extending in the vertical direction is provided at the outer peripheral end of the plate 531 on the outer peripheral side of the turbine means 532. By providing the drag increasing end plate 533, it is possible to dam the water in the vicinity and increase the amount of water flowing into the turbine means 532. The drag increasing end plate 533 is fixedly bonded to the spar portion 20 by a plurality of steel materials or coupling materials 80 such as wires.
As shown in FIG. 7, the turbine means 532 and the drag increasing end plate 533 are fixedly provided with the plate 531 on the spar portion 20, and the turbine means 532 and the drag increasing end plate 533 are fixedly provided on the plate 531. If so, it is not necessary to fix the spur portion 20 with the binder 80. In FIG. 7, the plate 531 is fixedly provided at the lower part of the spar portion 20.

The turbine means 532 is a hydraulic reciprocating flow type turbine, and an auxiliary generator 64 is connected as an energy recovery means 60.
When the wave incident on the wave power generation system shifts from the cycle in which the linear power generation mechanism efficiently generates power to the long cycle side, the spar portion 20 moves up and down due to the long cycle wave to generate a water flow, and the turbine means 532 The rotating body rotates. The auxiliary generator 64, which is the energy recovery means 60, recovers the movement of the turbine means 532 as hydraulic energy and performs auxiliary power generation.
In this way, the energy of the long-period wave is recovered by using the turbine means 532 and the energy recovery means 60, and auxiliary power generation is performed to supplement the power generation by the power generation means 40 and improve the power generation efficiency of the wave power generation system. Can be made to.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.
The auxiliary generator 64 can also be a direct power generation mechanism that directly generates power regardless of hydraulic pressure. Including this case, the electric power generated by the turbine means 532 can be sent to the spar portion 20 via the wiring provided in the coupling member 80.
Further, the energy recovery means 60 may recover the movement of the hydraulic reciprocating flow turbine as hydraulic energy. By using the movement of the hydraulic reciprocating turbine to drive, for example, a hydraulic pump to recover hydraulic energy, it becomes possible to store the recovered energy and make it easier to use for hydraulic equipment. Further, by storing the recovered energy, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed.
In this case, the recovered hydraulic energy can be guided to the pressure accumulating means 62 and the hydraulic control means 63 provided in the spar portion 20 via the piping provided in the coupling member 80.

FIG. 8 is a diagram showing a wave power generation system according to a sixth embodiment, and shows a lower part of a spar portion and a part of an overhanging means. The same functional members as those of the wave power generation system according to the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In the wave power generation system according to the present embodiment, the floating body portion 10, the spar portion 20, the plate-shaped overhanging means 30 provided at the lower part of the spar portion 20, and the power generation means 40 arranged in the spar portion 20 ( FIG. 8 has (not shown), and the overhanging means 30 has a turbine means 632 that makes all of the overhanging means 30 movable as a movable means.
The turbine means 632 has a plurality of blades provided at the bottom of the spar portion 20. The rotation shaft of the blade is housed in the spar portion 20.

The turbine means 632, which is a movable means in the wave power generation system of this embodiment, is a reciprocating flow type turbine. By using a reciprocating flow type turbine (wells turbine), the water flow can be rotated in one direction regardless of whether the water flow flows into the turbine means 632 from either the upper or lower direction, and the energy recovery efficiency is improved. Further, the relative motion between the floating body portion 10 and the spar portion 20 can be further increased due to the fluid resistance generated by the reciprocating flow turbine.
The wave power generation system can recover the energy of a long-period wave as a direct rotational motion by the turbine means 632 by utilizing the water flow generated by the vertical motion of the spar portion 20.

The turbine means is a hydraulic reciprocating flow type turbine, and an auxiliary generator 64 (not shown in FIG. 8) is connected as the energy recovery means 60.
When the wave incident on the wave power generation system shifts from the cycle in which the linear power generation mechanism efficiently generates power to the long cycle side, the spar portion 20 moves up and down due to the long cycle wave to generate a water flow, and the turbine means 632 The rotating body rotates. The auxiliary generator 64, which is the energy recovery means 60, recovers the movement of the turbine means 632 as hydraulic energy and performs auxiliary power generation.
In this way, the energy of the long-period wave is recovered by using the turbine means 632 and the energy recovery means 60, and auxiliary power generation is performed to supplement the power generation by the power generation means 40 and improve the power generation efficiency of the wave power generation system. Can be made to.
Further, the energy recovered by the energy recovery means 60 may be used to control the relative motion speed of the floating body portion 10 and the spar portion 20. By using the recovered energy for control, the efficiency of the wave power generation system can be further improved.
Further, the energy recovery means 60 may recover the movement of the hydraulic reciprocating flow turbine as hydraulic energy. By using the movement of the hydraulic reciprocating turbine to drive, for example, a hydraulic pump to recover hydraulic energy, it becomes possible to store the recovered energy and make it easier to use for hydraulic equipment. Further, by storing the recovered energy, the recovered hydraulic energy can be easily used at an arbitrary timing, and when the hydraulic pressure fluctuates, the hydraulic pressure can be smoothed.
In addition, including the fifth embodiment, a direct power generation type reciprocating flow turbine that directly generates auxiliary power can be used instead of the hydraulic reciprocating flow type turbine.

The wave power generation system of the present invention can recover the energy of a long-period wave and has excellent power generation efficiency. Therefore, it can be used even in the sea area where the waves are relatively weak.

10 Floating part 20 Spar part 30 Overhanging means 40 Power generation means 50 Hinge 60 Energy recovery means 62 Accumulation means 63 Hydraulic control means 64 Auxiliary generator 131 Heave plate 132, 232, 332, 432, 532, 632 Movable means (flap means, Support means, rotation mechanism, turbine means)
231 and 331 Working plate 233 Universal joint means

Claims (14)

It has a floating body portion, a spar portion, and a power generation means, and has an overhanging means provided overhanging the lower part of the spar portion in order to increase the relative motion speed between the floating body portion and the spar portion with respect to an incident wave. In the wave power generation system, the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy associated with the movement of the movable means. The overhanging means has a plate shape and is movable. The means is configured to make a part of the plate-shaped overhanging means movable, or the movable means to make the entire plate-shaped overhanging means movable, and the overhanging means is fixed to the spar portion. A wave power generation system comprising a heave plate provided in the above direction and a plate-shaped flap means provided on the heave plate as the movable means . The wave power according to claim 1 , wherein the flap means is a plurality of movable flaps provided around the heave plate, and the energy recovery means recovers the movement of the movable flap as hydraulic energy. Power generation system. It has a floating body portion, a spar portion, and a power generating means, and has an overhanging means provided overhanging the lower part of the spar portion in order to increase the relative motion speed of the floating body portion and the spar portion with respect to an incident wave. In the wave power generation system, the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy associated with the movement of the movable means. The overhanging means has a plate shape and is movable. The means has a structure in which a part of the plate-shaped overhanging means is movable, or the movable means is movable as a whole of the plate-shaped overhanging means, and the overhanging means has a structure with respect to the spar portion. A wave power generation system characterized by having an operating plate capable of translational movement as a whole, and a supporting means for supporting the operating plate so as to be movable in the vertical direction as the movable means. The support means is a linear motion hydraulic cylinder that connects the moving plate to the spar portion via a universal joint means, and the energy recovery means recovers the movement of the linear motion hydraulic cylinder as hydraulic energy. The wave power generation system according to claim 3 , wherein the wave power system is characterized by the above. The support means for supporting the moving plate is a linear motion hydraulic cylinder fixedly connected to the spar portion, and the energy recovery means recovers the movement of the linear motion hydraulic cylinder as hydraulic energy. The wave power generation system according to claim 3 , wherein the wave power system is characterized by the above. It has a floating body portion, a spar portion, and a power generation means, and has an overhanging means provided overhanging the lower part of the spar portion in order to increase the relative motion speed between the floating body portion and the spar portion with respect to an incident wave. In the wave power generation system, the overhanging means is provided with a movable means, and further is provided with an energy recovery means for recovering energy associated with the movement of the movable means. The overhanging means has a plate shape and is movable. The means is configured to make a part of the plate-shaped overhanging means movable, or the movable means to make the entire plate-shaped overhanging means movable, and the overhanging means is entirely around the axis. A wave power generation system characterized by having an operating flap means having a rotatable plate shape and a rotation mechanism provided on the shaft as the movable means. The wave power generation system according to claim 6 , wherein the rotation mechanism is a hydraulic rotation mechanism, and the energy recovery means recovers the movement of the hydraulic rotation mechanism as hydraulic energy. The wave power generation system according to claim 2 , claim 4 , claim 5 , or claim 7 , wherein the energy recovery means has a pressure storage means for storing the recovered hydraulic energy. The wave power generation system according to claim 8 , wherein the energy recovery means includes a hydraulic control means that controls the use of the hydraulic energy stored in the accumulator means based on the relative motion speed. The wave power generation system according to any one of claims 1 to 9 , wherein the power generation means is a hydraulic linear power generation mechanism. Claim 2 , claim 4 , claim 5 , claim 7 , claim 8 , and claim 9 , wherein the recovered hydraulic energy is guided to and used by the hydraulic linear power generation mechanism. The wave power generation system according to claim 10 , wherein any one of the above is cited. The wave power generation system according to any one of claims 1 to 11 , wherein the relative motion speed of the floating body portion and the spar portion is controlled by using the power generation means. The wave power generation system according to any one of claims 1 to 12 , wherein the energy recovered by the energy recovery means is used for controlling the relative motion speed of the floating body portion and the spar portion. .. The wave power generation system according to any one of claims 1 to 13 , wherein the overhanging means and the energy recovery means are provided in a plurality of stages in the vertical direction of the spar portion.

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