Wave power generation equipment and power generation system

Abstract

The present invention provides a wave power generation system that can alleviate the limitations on power generation caused by the length of the rope. [Solution] The wave power generation device according to the embodiment comprises a second floating body floating on the ocean and connected to a first floating body floating on the ocean; a generator that generates electricity by converting the relative displacement between the first floating body and the second floating body into rotational motion; a rope connected to at least one of the first floating body and the second floating body and wrapped around the generator under tension; and a movable pulley around which the rope unwound from the generator is wrapped.

Description

Technical Field

[0001] This embodiment relates to a wave power generation device and a power generation system.

Background Art

[0002] An offshore wind power generation device that performs wind power generation on the ocean depends on an external power source for a control power source for controlling the angle and direction of the wind turbine. The supply network of the external power source may be cut off during disasters such as typhoons. When the external power source is lost, the control of the offshore wind power generation device becomes impossible.

[0003] Therefore, a technique of using the power generated by a wave power generation device as a control power source has been proposed. In such a wave power generation device, a wind turbine floating body on which a wind turbine of an offshore wind power generation device is mounted and a floating body for wave power generation connected to the wind turbine floating body by a rope are connected by a rope in a tensioned state. Thus, when waves occur, a relative displacement in the vertical direction (up and down direction) occurs between the two floating bodies. Wave power generation is performed by converting this relative displacement into a rotational force.

[0004] In the wave power generation device as described above, as the waves become larger, the relative displacement between the two floating bodies increases. Along with the increase in this relative displacement, the power generation amount of the wave power generation device also increases. On the other hand, as this relative displacement increases, the stroke (length) required for the rope connecting the two floating bodies becomes longer. As a result, a situation may occur where the power generation amount is limited due to the limitation of the rope length.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] Embodiments of the present invention aim to provide a wave power generation device and power generation system that can alleviate the limitations on power generation caused by the length of the rope. [Means for solving the problem]

[0007] A wave power generation device according to one embodiment comprises a second floating body floating on the ocean and connected to a first floating body floating on the ocean; a generator that generates electricity by converting the relative displacement between the first floating body and the second floating body into rotational motion; a rope connected to at least one of the first floating body and the second floating body and wrapped around the generator under tension; and a movable pulley around which the rope unwound from the generator is wrapped.

[0008] A power generation system according to one embodiment comprises an offshore wind power generation device and a wave power generation device that supplies power to the offshore wind power generation device. The wave power generation device includes a second floating body floating on the sea and connected to a first floating body floating on the sea, a generator that generates electricity by converting the relative displacement between the first floating body and the second floating body into rotational motion, a rope connected to at least one of the first floating body and the second floating body and wound around the generator under tension, and a movable pulley around which the rope unwound from the generator is wound. [Effects of the Invention]

[0009] According to one embodiment, it is possible to alleviate the limitations on the amount of power generated due to the length of the rope. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic external view of the power generation system according to the first embodiment. [Figure 2] This is a schematic cross-sectional view showing the main parts of the wave power generation device according to the first embodiment. [Figure 3] This is a schematic cross-sectional view showing the main part of the wave power generation device according to the first modified example. [Figure 4] This is a schematic cross-sectional view showing the main part of a wave power generation device according to the second modified example. [Figure 5] This is a schematic cross-sectional view showing the main parts of a wave power generation device according to the second embodiment. [Figure 6] This is a schematic cross-sectional view showing the main parts of a wave power generation device according to the third embodiment. [Figure 7] This is a schematic cross-sectional view showing the main parts of a wave power generation device according to the fourth embodiment. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are not intended to limit the present invention.

[0012] (First Embodiment) Figure 1 is a schematic external view of the power generation system 1 according to the first embodiment. The power generation system 1 shown in Figure 1 comprises an offshore wind power generation device 10 and a wave power generation device 20. First, the offshore wind power generation device 10 will be described.

[0013] The offshore wind power generation device 10 includes a nacelle 11, a plurality of blades 12, and a tower 13. The nacelle 11 is supported so as to be rotatable around an axis that extends vertically relative to the tower 13 according to the wind direction, etc. The blades 12 are rotatably mounted on the nacelle 11. A wind turbine (not shown) that generates electricity by the rotation of the blades 12 is built into the nacelle 11. Although not shown, the offshore wind power generation device 10 further includes electrical equipment that supplies the power generated by the wind turbine to the outside, and a control device that controls the offshore wind power generation device 10.

[0014] Next, the wave power generation apparatus 20 according to this embodiment will be described with reference to Figures 1 and 2.

[0015] FIG. 2 is a cross-sectional view schematically showing a main part of the wave power generation device 20 according to the first embodiment. FIG. 2 shows a cross-section obtained by vertically cutting the main part of the wave power generation device 20 shown in FIG. 1. The wave power generation device 20 according to the present embodiment includes a second floating body 220, a generator 230, a rope 240, a movable pulley 250, and an elastic body 260.

[0016] In the present embodiment, the first floating body 210 is composed of an ocean floating body that floats on the ocean while supporting the offshore wind power generation device 10, and three floating bodies that are arranged in a triangular shape surrounding the ocean floating body and float on the ocean while being connected to each other. Each of these three floating bodies has a main body 211 and a first pedestal 212. The lower part of the main body 211 is located below the water surface W and is immersed in water. On the other hand, the upper part of the main body 211 is located above the water surface W. Note that the first floating body 210 may be arranged to surround the ocean floating body with four floating bodies in a square shape.

[0017] The first pedestal 212 is provided on the outer peripheral surface of the upper part of the first floating body 210 located on the water surface W. The generator 230 is fixed on the first pedestal 212. In the present embodiment, one generator 230 is fixed to the first pedestal 212, but a plurality of generators 230 may be arranged at equal intervals in the circumferential direction along the outer peripheral surface.

[0018] As described above, the first floating body 210 floats on the ocean. Therefore, the first floating body 210 vibrates under the excitation force of the wave, and a restoring force due to buoyancy acts on the first floating body 210. Thus, the first floating body 210 can be regarded as being elastically coupled to the stationary system by water. The natural vibration frequency of the first floating body 210 may be designed to be sufficiently detuned from the vibration frequency of the wave.

[0019] The second floating body 220 floats on the ocean, separate from the first floating body 210. The second floating body 220 is connected to the first floating body 210 via a rope 240. In this embodiment, when a wave is generated while tension is applied to the rope 240, a relative vertical translational motion occurs between the first floating body 210 and the second floating body 220. In this embodiment, they are connected by a single rope 240, but they may be connected by multiple ropes in parallel.

[0020] The generator 230 generates electricity by converting the above relative translational motion into rotational motion. The generator 230 includes a rotating shaft 231, a rotor 232, a stator 233, a first gear 234, a second gear 235, a bearing 236, and a fixed pulley 237.

[0021] The rotating shaft 231 extends horizontally and rotates the rotor 232. A first gear 234 is rotatably connected to one end of the rotating shaft 231. The rotor 232 rotates about the rotating shaft 231. A stator 233 is provided around the rotor 232. The rotating shaft 231 and the rotor 232 are configured to also function as inertial mass elements that suppress the swaying of the first floating body 210 to which the offshore wind turbine 10 is attached.

[0022] The first gear 234 rotates the rotating shaft 231. The second gear 235 rotates the rotating shaft 231 by engaging with the first gear 234. The reference circle diameter of the second gear 235 is larger than that of the first gear 234. The second gear 235 is rotatably connected to a bearing 236. The first gear 234 and the second gear 235 function as a speed increaser, increasing the rotational speed of the rotating shaft 231. This speed increaser ensures that the power required to control the offshore wind power generation device 10 can be adequately supplied by the power generated by the generator 230.

[0023] The bearing 236 rotatably supports the fixed pulley 237. The rope 240 is wound around the fixed pulley 237. The bearing 236 and the fixed pulley 237 function as a conversion mechanism that converts the relative displacement between the first floating body 210 and the second floating body 220 into rotational force.

[0024] The rope 240 is made of, for example, wire or chain. One end of the rope 240 is connected to the bottom of the first frame 212 of the first floating body 210. The other end of the rope 240 is connected to the bottom of the second floating body 220, which is located in the water. In the water, the rope 240 is wrapped around pulleys 30 and 31 under tension.

[0025] Pulley 30 is located at the bottom of the main body 211. Pulley 31 is positioned between the bottom of the main body 211 and the bottom of the second floating body 220 and is rotatably connected to the bottom of the main body 211 by a wire 32. When the rope 240 is wrapped around pulleys 30 and 31 under tension, the distance between the first floating body 210 and the second floating body 220 is maintained, thereby preventing a collision between the two floating bodies.

[0026] The movable pulley 250 is connected to the bottom of the first frame 212 via an elastic body 260 below the rope 240 unwound from the fixed pulley 237. The rope 240 unwound from the fixed pulley 237 is wrapped around the movable pulley 250. The movable pulley 250 is movable vertically in accordance with the relative displacement between the first floating body 210 and the second floating body 220. At this time, tension is applied to the rope 240 based on the gravity of the movable pulley 250 and the elastic force of the elastic body 260. To increase the frictional force of the rope 240 against the movable pulley 250, the rope 240 may be wrapped around the movable pulley 250 multiple times.

[0027] In the wave power generator 20 configured as described above, when a wave causes vertical translational motion between the first floating body 210 and the second floating body 220, the relative positions of the two floating bodies change. At this time, since the rope 240 has tension, it can rotate the fixed pulley 237. As a result, the relative displacement between the first floating body 210 and the second floating body 220 is converted into rotational motion of the fixed pulley 237.

[0028] The rotational force generated by the rotational motion of the fixed pulley 237 is transmitted to the second gear 235 via the rotating shaft. The first gear 234 is engaged with the second gear 235. Therefore, the first gear 234 rotates together with the second gear 235. The rotating shaft 231 is connected to the first gear 234. Therefore, the rotational force of the first gear 234 is transmitted to the rotating shaft 231. As a result, the rotor 232 rotates around the rotating shaft 231 inside the stator 233. As a result, power is generated. The generated electricity is supplied to the control device of the offshore wind power generation device 10.

[0029] In the wave power generation device 20 according to this embodiment, as the wave size increases, the relative displacement between the first floating body 210 and the second floating body 220 also increases. As a result, the rotational force of the fixed pulley 237 increases, and therefore the rotational force of the rotor 232 also increases. Consequently, the amount of power generated by the generator 230 increases. On the other hand, since the first floating body 210 and the second floating body 220 are connected by a rope 240, a larger relative position requires a longer rope 240.

[0030] Therefore, in the wave power generation device 20 according to this embodiment, a movable pulley 250 is placed between the fixed pulley 237 and the first floating body 210, and the rope 240 is wound around this movable pulley 250. As a result, the vertical stroke of the rope 240 is halved compared to when the movable pulley 250 is not provided. Therefore, the limitations on the length of the rope 240 are relaxed.

[0031] Therefore, according to this embodiment, the limitation on the amount of power generated by the wave power generator 20 due to the length of the rope 240 can be alleviated. This makes it possible to adequately supply the power necessary for controlling the offshore wind power generator 10. In addition, in this embodiment, since an elastic body 260 (spring) is also provided on the movable pulley 250, tension is always applied to the rope 240. Therefore, it is possible to suppress the occurrence of events such as a sudden increase in rotational speed due to the loosening of the rope 240, or sudden tension on the rope 240 causing rotational fluctuations or a sudden increase in tension.

[0032] In this embodiment, the conversion mechanism that converts the relative displacement between the first floating body 210 and the second floating body 220 into rotational motion is composed of a bearing 236 and a fixed pulley 237, but it may be composed of other mechanical parts. For example, the conversion mechanism may be composed of a ball screw that rotates with the relative displacement. In this case, since the rotating shaft 231 connected to the ball screw extends in the vertical direction, the rotation direction of the rotor 232 changes by 90 degrees with respect to the rotating shaft 231 (see Figure 2) which extends in the horizontal direction.

[0033] (First variation) Figure 3 is a schematic cross-sectional view showing the main parts of a wave power generation device according to the first modified example. In Figure 3, the same reference numerals are used for components similar to those in the wave power generation device 20 according to the first embodiment described above, and redundant explanations are omitted.

[0034] The wave power generation device 21 according to this modified example further includes a fixed pulley 270 and a counterweight 280 in addition to the components of the wave power generation device 20 according to the first embodiment. The fixed pulley 270 is fixed to the bottom of the first frame 212 at a position above the movable pulley 250. The rope 240 unwound from the movable pulley 250 is wound around the fixed pulley 270. One end of the rope 240 unwound from the fixed pulley 270 is connected to the counterweight 280.

[0035] In the wave power generation device 21 configured as described above, when a relative displacement occurs between the first floating body 210 and the second floating body 220 due to waves, the relative displacement is converted into rotational motion of the fixed pulley 237. The rotational motion of the fixed pulley 237 ultimately acts on the rotation of the rotor 232, similar to the first embodiment, so that the generator 230 can generate electricity. In addition, since the wave power generation device 21 is provided with a movable pulley 250 around which the rope 240 is wound, the limitation on the length of the rope 240 is relaxed. As a result, it is possible to relax the limitation on the amount of electricity generated by the wave power generation device 21.

[0036] In addition, in this modified example, the movable pulley 250 and the counterweight 280 are suspended from the fixed pulley 270 by the rope 240. Therefore, by adjusting the weight of the counterweight 280 to a weight that does not cause the tension of the elastic body 260 to loosen under the conditions of the maximum wave amplitude assumed during power generation, it is possible to stabilize the movement of the movable pulley 250.

[0037] (Second variation) Figure 4 is a schematic cross-sectional view showing the main parts of the wave power generation device according to the second modified example. In Figure 4, the same reference numerals are used for components similar to those of the wave power generation device 21 according to the first modified example described above, and redundant explanations are omitted.

[0038] In the wave power generation device 22 according to this modified example, a plurality of movable pulleys 250 are provided. Each movable pulley 250 is connected to the bottom of the first frame 212 via an elastic body 260. Fixed pulleys 270, as described in the first modified example, are provided between the plurality of movable pulleys 250. The plurality of movable pulleys 250 are suspended from the fixed pulleys 270 by ropes 240. The ropes 240 unwound from the fixed pulleys 237 are wound around the movable pulleys 250 and then the fixed pulleys 270 in that order, and finally one end of the ropes 240 is connected to the bottom of the first frame 212. Furthermore, counterweights 280, as described in the first modified example, are suspended from the plurality of movable pulleys 250.

[0039] In the wave power generator 22 configured as described above, when a relative vertical displacement occurs between the first floating body 210 and the second floating body 220 due to waves, the relative displacement is converted into rotational motion of the fixed pulley 237, similar to the first embodiment. The rotational motion of the fixed pulley 237 ultimately contributes to the rotational motion of the rotor 232, so that the generator 230 can generate electricity.

[0040] In this embodiment in particular, the rope 240 is wrapped around multiple movable pulleys 250. Therefore, the vertical stroke of the rope 240 can be further shortened compared to the first embodiment. For example, as shown in Figure 4, when three movable pulleys 250 are provided, the amount of vertical displacement can be reduced to 1 / 6 compared to when no movable pulleys 250 are provided.

[0041] In addition, in this modified example, the counterweight 280 is suspended from multiple movable pulleys 250. Therefore, it is possible to stabilize the movement of each movable pulley 250 so that the weight of the counterweight 280 does not cause the tension of the elastic body 260 to loosen under the conditions of the maximum wave amplitude assumed during power generation.

[0042] (Second Embodiment) Figure 5 is a schematic cross-sectional view showing the main parts of the wave power generation device according to the second embodiment. In Figure 5, the same reference numerals are used for components similar to those in the wave power generation device 20 according to the first embodiment described above, and redundant explanations are omitted.

[0043] In the wave power generation device 23 according to this embodiment, as shown in Figure 5, a generator 230, a movable pulley 250, and an elastic body 260 are provided inside the second floating body 220. An opening is provided at the bottom of the second floating body 220 through which a rope 240 passes. This opening is sealed by a sealing member 221. This prevents water from entering the inside of the second floating body 220. Inside the second floating body 220, a second frame 222 is provided to which the generator 230 is fixed. In addition to the generator 230, a bearing 236 and a fixed pulley 237 are also fixed to the upper part of the second frame 222. Furthermore, a movable pulley 250 is mounted at the bottom of the second frame 222 via the elastic body 260 so as to be movable in the vertical direction.

[0044] One end of the rope 240 is connected underwater to the main body 211 of the first floating body 210 via the wire 32. The rope 240 extends vertically through an opening sealed by the sealing member 221 and is wound around the fixed pulley 237. The rope 240 unwound from the fixed pulley 237 is wound around the movable pulley 250. The rope 240 unwound from the movable pulley 250 is connected to the bottom of the second frame 222.

[0045] In the wave power generator 23 configured as described above, when a relative vertical displacement occurs between the first floating body 210 and the second floating body 220 due to waves, this relative displacement is converted into rotational motion of the fixed pulley 237, similar to the first embodiment. The rotational speed of this rotational motion is increased by the second gear 235 and the first gear 234, and ultimately acts on the rotation of the rotor 232 around the rotation axis 231. As a result, the generator 230 can generate electricity.

[0046] According to this embodiment, a movable pulley 250 is wrapped around the rope 240. This allows the limitation on the length of the rope 240 to be relaxed even if the relative displacement between the first floating body 210 and the second floating body 220 becomes large. This also makes it possible to relax the limitation on the amount of power generated by the wave power generator 23.

[0047] In addition, in this embodiment, the generator 230 is housed within the second floating body 220. This makes it possible to miniaturize the entire power generation system compared to the first embodiment, in which the generator 230 is installed outside the first floating body 210.

[0048] (Third embodiment) Figure 6 is a schematic cross-sectional view showing the main parts of the wave power generation device according to the third embodiment. In Figure 6, the same reference numerals are used for components similar to those in the wave power generation device 20 according to the first embodiment described above, and redundant explanations are omitted.

[0049] In the wave power generation device 24 according to this embodiment, as shown in Figure 6, the second floating body 220 is connected to the main body 211 of the first floating body 210 by a mooring wire 33. The other end of the rope 240 is connected to the upper surface of the second floating body 220.

[0050] In the wave power generator 24 configured as described above, when a relative vertical displacement occurs between the first floating body 210 and the second floating body 220 due to waves, this relative displacement is converted into rotational motion of the fixed pulley 237, similar to the first embodiment. The rotational speed of the fixed pulley 237 is increased by the second gear 235 and the first gear 234, and ultimately acts on the rotation of the rotor 232 around the rotation axis 231. As a result, the generator 230 can generate electricity.

[0051] According to this embodiment, as in other embodiments, the movable pulley 250 is wrapped around the rope 240. This allows the limitation on the length of the rope 240 to be relaxed even if the relative displacement between the first floating body 210 and the second floating body 220 becomes large. This also makes it possible to relax the limitation on the amount of power generated by the wave power generator 23.

[0052] Furthermore, in this embodiment, the mooring wire 33 connects the second floating body 220 to the first floating body 210 (main body 211) underwater, and the rope 240 is configured to lift the second floating body 220. Therefore, the length of the rope 240 can be shortened compared to the first embodiment, in which the rope 240 connects the second floating body 220 to the first floating body 210 by submerging from above the water.

[0053] (Fourth Embodiment) Figure 7 is a schematic cross-sectional view showing the main parts of the wave power generation device according to the fourth embodiment. In the wave power generation device 25 shown in Figure 7, the generator 230, movable pulley 250, and elastic body 260 are provided inside the second floating body 220, similar to the wave power generation device 23 according to the second embodiment (see Figure 5) described above. Also, similar to the wave power generation device 24 according to the third embodiment described above, the second floating body 220 is connected to the main body 211 of the first floating body 210 by a mooring wire 33. Meanwhile, one end of the rope 240 is connected to the bottom surface of the first frame 212 of the first floating body 210. The other end of the rope 240 is connected to the top surface of the second frame 222.

[0054] In the wave power generator 25 configured as described above, when a relative vertical displacement occurs between the first floating body 210 and the second floating body 220 due to waves, this relative displacement is converted into rotational motion of the fixed pulley 237, as in other embodiments. The rotational speed of this rotational motion is increased by the second gear 235 and the first gear 234, and ultimately acts on the rotation of the rotor 232 around the rotation axis 231. As a result, the generator 230 can generate electricity.

[0055] According to this embodiment, as in other embodiments, the movable pulley 250 is wrapped around the rope 240. This allows the limitation on the length of the rope 240 to be relaxed even if the relative displacement between the first floating body 210 and the second floating body 220 becomes large. This also makes it possible to relax the limitation on the amount of power generated by the wave power generator 23.

[0056] Furthermore, in this embodiment, similar to the second embodiment, the generator 230 is housed within the second floating body 220, making it possible to miniaturize the entire power generation system.

[0057] Furthermore, in this embodiment, the mooring wire 33 connects the second floating body 220 to the first floating body 210 (main body 211) underwater, and the rope 240 is configured to lift the second floating body 220 from the first support base 212 of the first floating body 210. Therefore, the length of the rope 240 can be shortened compared to the first embodiment.

[0058] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. Naturally, these embodiments can also be partially combined as appropriate within the scope of the spirit of the invention. [Explanation of symbols]

[0059] 1: Power generation system 10: Offshore wind power generation equipment 20-25: Wave power generation device 33: Mooring wire 210: First floating body 211: Main unit 212: First mounting base 220: Second floating body 222: Second mounting base 230: Generator 231: Rotation axis 232: Rotor 233: Stator 234: First gear 235: Second gear 236: Bearings 237: Fixed pulley 240: Rope 250: Moving pulley 270: Fixed pulley 280: Counterweight

Claims

1. The first floating body floating on the ocean is connected to the second floating body floating on the ocean, A generator that converts the relative displacement between the first floating body and the second floating body into rotational motion to generate electricity, A rope connected to at least one of the first float and the second float, and wrapped around the generator under tension, A movable pulley around which the rope unwound from the generator is wound, A wave power generation device equipped with [specific features / equipment].

2. The wave power generation apparatus according to claim 1, further comprising an elastic body connecting the movable pulley to the first or second floating body.

3. The wave power generation device according to claim 1 or 2, wherein the first floating body supports the offshore wind power generation device.

4. The first floating body comprises a main body and a first support provided on the outer circumferential surface of the main body. The generator is fixed to the first frame, The wave power generation device according to claim 1 or 2, wherein one end of the rope is connected to the bottom of the first frame, and the other end of the rope is connected to the bottom of the second floating body while wrapped around a pulley in the water.

5. The first floating body comprises a main body and a first support provided on the outer circumferential surface of the main body. The generator is fixed to the first frame, The wave power generation device according to claim 1 or 2, wherein one end of the rope is connected to a counterweight, and the other end of the rope is connected to the bottom of the second floating body while wrapped around a pulley in the water.

6. The wave power generation apparatus according to claim 3, wherein the rope is wrapped around a plurality of the movable pulleys.

7. The wave power generation apparatus according to claim 1 or 2, wherein the generator and the movable pulley are housed in the second floating body.

8. The first floating body comprises a main body and a first support provided on the outer circumferential surface of the main body. The generator is fixed to the first frame, One end of the rope is connected to the bottom of the first frame, and the other end of the rope is connected to the upper surface of the second floating body. The wave power generation apparatus according to claim 1 or 2, wherein the second floating body is connected to the first floating body underwater by a mooring wire.

9. The first floating body comprises a main body and a first support provided on the outer circumferential surface of the main body. A second support structure is provided inside the second floating body. The generator is fixed to the second frame, The wave power generation apparatus according to claim 7, wherein one end of the rope is connected to the bottom of the first frame, the other end of the rope is connected to the upper surface of the second floating body, and the other end of the rope is connected to the upper surface of the second frame.

10. The aforementioned generator, A conversion mechanism that converts the aforementioned relative displacement into rotational motion, A speed increaser connected to the aforementioned conversion mechanism, A rotating shaft connected to the aforementioned speed increaser, A rotor that rotates around the aforementioned axis of rotation, A stator is provided around the rotor, A wave power generation apparatus according to claim 9, having the following features.

11. Offshore wind power generation equipment, A power generation system comprising a wave power generation device that supplies power to the offshore wind power generation device, The aforementioned wave power generation device, The first floating body floating on the ocean is connected to the second floating body floating on the ocean, A generator that converts the relative displacement between the first floating body and the second floating body into rotational motion to generate electricity, A rope connected to at least one of the first float and the second float, and wrapped around the generator under tension, The system includes a movable pulley around which the rope unwound from the generator is wound, Power generation system.

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