JP2019199861A - Water flow power generation system - Google Patents

Abstract

To provide a water flow power generation system capable of changing the position of a turbine shaft with respect to a power generation pod.SOLUTION: A water flow power generation system 1 comprises: a turbine 4; a turbine shaft 12 attached to the turbine 4; a power generation pod 3 including a power generator 5 that generates power by receiving the rotational driving force of the turbine shaft 12; and a shaft movement mechanism 14 capable of moving the position of the turbine shaft 12 relative to the power generation pod 3 in the radial direction of the turbine 4.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a water current power generation system.

  For example, there is a water current generator that is moored to a sinker at the bottom of the water and generates power while floating in water (see, for example, Patent Document 1). The water current generator includes a turbine that rotates by receiving a water flow, a generator that generates electric power by receiving the rotational driving force of the turbine, and a power generation pod that houses the generator and floats in water.

JP 2017-13721 A

  In the conventional water current generator, the turbine shaft that is the rotation center of the turbine rotates at the same position with respect to the power generation pod. The present disclosure describes a water current power generation system capable of changing the position of a turbine shaft relative to a power generation pod.

  A water current power generation system according to an aspect of the present disclosure includes a turbine, a turbine shaft attached to the turbine, a power generation pod including a power generator that generates power by receiving a rotational driving force by the turbine shaft, and a position of the turbine shaft with respect to the power generation pod. And a shaft moving mechanism capable of moving in the radial direction of the turbine.

  A turbine of a water current power generation system is disposed in water and rotates in response to a water flow. The turbine rotates about the turbine shaft as a rotation center. The rotation of the turbine is transmitted to the generator via the turbine shaft. Since this power generation system includes a shaft moving mechanism, the position of the turbine shaft relative to the power generation pod can be moved in the radial direction of the turbine.

  In some aspects, the shaft moving mechanism includes a bearing that rotatably supports the turbine shaft, a support member that extends in a radial direction of the turbine and supports the bearing, and a drive that moves the support member in the radial direction of the turbine. May be included. Thereby, the support member which supports a bearing can be moved, and the position of a turbine shaft can be changed.

  In some aspects, the hydroelectric power generation system may include a universal joint that connects the rotating shaft of the generator and the turbine shaft, and the turbine shaft may be configured to be movable with respect to the rotating shaft. Thereby, the position of the turbine shaft can be changed with respect to the rotating shaft of the generator. The position of the turbine shaft can be changed without changing the position of the generator.

  In some aspects, the water current power generation system further includes an attitude detection unit that detects the inclination of the power generation pod with respect to the horizontal direction, and a control unit that controls the position of the turbine shaft based on the inclination of the power generation pod. Also good. This water current power generation system can change the position of the turbine shaft, change the position of the turbine, and change the moment acting on the power generation pod. As a result, the inclination of the power generation pod can be changed.

  According to the power generation system of the present disclosure, the position of the turbine shaft with respect to the power generation pod can be changed to move the rotation center of the turbine.

1 is a schematic diagram illustrating an underwater floating power generation system according to an embodiment of the present disclosure. It is sectional drawing which shows the electric power generation pod in FIG. FIG. 3A is a schematic view showing the power generation pod in an inclined state. FIG. 3B is a schematic diagram showing the power generation pod after moving the turbine shaft. FIG. 3C is a schematic diagram showing the moment acting on the power generation pod. FIG. 3D is a schematic diagram showing the power generation pod after the posture is corrected. It is a block block diagram which shows the control unit of an underwater floating type electric power generation system. It is a flowchart which shows the procedure of the movement control of a turbine shaft.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

  An underwater floating power generation system (water current power generation system) 1 shown in FIG. 1 is installed, for example, in seawater, and generates power using an ocean current FW. Hereinafter, the underwater floating power generation system 1 is referred to as “power generation system 1”. The upstream side of the ocean current FW will be described as the front side, and the downstream side of the ocean current FW will be described as the rear side. 1 to 3, three intersecting directions (X direction, Y direction, and Z direction) are indicated by arrows. The X direction is a horizontal direction along the ocean current FW. The Y direction is a horizontal direction that intersects the X direction. The Z direction is the vertical direction.

  The power generation system 1 includes a water current power generation device 2. Hereinafter, the water current generator 2 is referred to as a “power generator 2”. The power generation device 2 includes a pair of power generation pods 3 that are spaced apart from each other, for example. The power generation pod 3 is a floating body that can float in water. The power generation device 2 may be configured to include a central pod disposed between the pair of power generation pods 3. The pair of power generation pods 3 are connected by, for example, a cross beam (strength member). The power generation device 2 is not limited to the one including the pair of power generation pods 3 and may include one power generation pod 3 or may include three or more power generation pods 3.

  The front portion 3a of the power generation pod 3 is disposed on the upstream side of the ocean current FW, and the rear portion 3b is disposed on the downstream side of the ocean current FW. A turbine 4 is provided at the rear portion 3 b of the power generation pod 3. The power generation pod 3 includes a cylindrical container, for example, and rotatably supports the turbine 4. A so-called downwind turbine is used as the turbine 4. The turbine 4 may be an upwind turbine. As shown in FIG. 2, the power generation pod 3 accommodates a generator 5 that generates power by the rotational driving force of the turbine 4.

  As shown in FIG. 1, the power generation pod 3 is connected to a sinker (or anchor) 6 disposed on the seabed B via a mooring line 7. The sinker 6 may be, for example, a friction type sinker or another sinker. The anchor may be a pile-type anchor, a suction-type anchor, or another anchor.

  The lower end of the mooring line 7 is connected to the sinker 6, and the upper end of the mooring line 7 is connected to the power generation pod 3. The upper ends of the mooring lines 7 are connected to a pair of power generation pods 3, for example. The mooring line 7 may be connected to the central pod instead of the power generation pod 3 or may be connected to a cross beam. For example, a depth adjusting rope that can change the depth of the power generation pod 3 by adjusting the length is not connected to the power generation pod 3.

  A power transmission cable 8 is connected to the power generation pod 3. The power transmission cable 8 may be disposed along the mooring line 7. One end of the power transmission cable 8 is connected to the generator 5 in the power generation pod 3. The other end of the power transmission cable 8 is connected to the submarine power transmission cable 9 in the sinker 6, for example. The power transmission cable 8 is connected to the submarine power transmission cable 9 via a repeater (for example, including a transformer) provided in the sinker 6. The submarine power transmission cable 9 is laid on the seabed B and connected to, for example, a ground power system (external power source or the like). The electric power generated by the generator 5 is transmitted to the power system through the power transmission cable 8 and the submarine power transmission cable 9. Similarly, power can be supplied to the power generation pod 3 from the power system.

  As shown in FIG. 2, the turbine 4 includes a hub 10 and a plurality of (for example, two) blades 11 provided on the hub 10. In the power generation system 1 that employs a downwind turbine, a blade 11 is disposed on the downstream side of the power generation pod 3 with reference to the direction of the ocean current FW.

  A turbine shaft 12 serving as a rotation center is connected to the hub 10. The turbine shaft 12 rotates integrally with the hub 10 and the blade 11. The turbine shaft 12 is connected to the rotating shaft 13 of the generator 5 via a joint unit 21 described later. The rotating shaft 13 is disposed along the direction in which the turbine shaft 12 extends. The rotation axis L4 of the turbine 4 is arranged in parallel with the rotation axis L5 of the rotation shaft 13 of the generator 5. In the state shown in FIG. 2, the rotation axes L4 and L5 extend in the X direction. The rotating shaft 13 is disposed along the central axis of the power generation pod 3. The driving force generated by the rotation of the blade 11 is transmitted to the rotating shaft 13 of the generator 5 via the turbine shaft 12. For example, the power generation pod 3 is provided with a rotation speed sensor that measures the rotation speed of the rotation shaft 13. A resolver or an encoder is mounted on the rotation speed sensor. Information on the detected number of rotations is transmitted to a control unit 31 (see FIG. 4) described later.

  In the power generation system 1, the pitch angle of the blades 11 is variable. The power generation system 1 includes a pitch angle adjusting device that can adjust the pitch angle of the blade 11. The pitch angle adjusting device includes, for example, a hydraulic drive device and a blade shaft. More specifically, a blade shaft is provided at the base end portion of each blade 11. A driving device is coupled to the blade shaft. The drive device is mounted in the hub 10, for example. The drive device includes, for example, a gear mechanism. A known mechanism can be used as the driving device. The drive device can adjust the pitch angle of the blade 11 to an arbitrary angle by rotating the blade shaft. The driving method may not be hydraulic, but may be an electric driving method using an electric motor or the like.

  The drive device is provided with a pitch angle sensor for detecting the pitch angle of the blade 11. The pitch angle of the blade 11 is a rotation angle around the axis of the blade axis. For example, a resolver or an encoder is mounted on the pitch angle sensor. In the power generation system 1, the magnitude of the turbine thrust force acting on the power generation pod 3 can be changed by changing the pitch angle.

  The power generation system 1 includes a buoyancy adjustment mechanism 38 (see FIG. 4). The buoyancy adjustment mechanism 38 is mounted on the power generation pod 3. The buoyancy adjusting mechanism 38 changes the weight of the entire floating body including the power generation pod 3 by pouring and draining, for example, seawater with the power generation pod 3. The buoyancy adjusting mechanism 38 includes a tank provided in the power generation pod 3, a pouring / draining pipe connecting the tank and the outside of the power generating pod 3, and a pump provided in the pouring / draining pipe. The tank is a water storage tank having a predetermined capacity. The pump pours water (for example, seawater) into the tank. The pump is driven by, for example, electric power generated by the generator 5. For example, the pump may be driven by electric power supplied using the power transmission cable 8. Further, the pump may be driven by electric power supplied from a battery mounted on the power generation pod 3. The buoyancy adjusting mechanism 38 is not limited to that provided in the power generation pod 3, and may be provided in another pod connected to the power generation pod 3.

  Here, the power generation system 1 includes a shaft moving mechanism 14 that can move the position of the turbine shaft 12 relative to the power generation pod 3 in the radial direction of the turbine 4. In the state shown in FIG. 2, the turbine shaft 12 is movable in the Z direction, for example.

  The wall 15 on the turbine 4 side of the power generation pod 3 is provided with an opening 16 penetrating in the plate thickness direction. The wall body 15 is disposed so as to cover one opening of the cylindrical portion of the power generation pod 3. The opening 16 is disposed at the center of the wall 15 as viewed from the X direction. The turbine shaft 12 passes through the opening 16 and extends from the inside of the power generation pod 3 to the outside. The inner diameter of the opening 16 is larger than the outer diameter of the turbine shaft 12. The size of the opening 16 corresponds to the moving range of the turbine shaft 12. For example, the opening 16 may have a long hole shape, a circular shape, or other shapes.

  A bellows 17 is provided on the outer surface of the wall 15 of the power generation pod 3. The bellows 17 is a bellows portion provided around the opening 16. The bellows 17 includes a cylindrical portion that can expand and contract in a direction in which the turbine shaft 12 extends. One end of the bellows 17 is in close contact with the outer surface of the wall body 15. A seal portion (watertight structure) is provided at the other end of the bellows 17. Thereby, intrusion of seawater into the power generation pod 3 is prevented. In addition, seawater intrusion into the power generation pod 3 may be prevented by another watertight structure.

  The power generation pod 3 is provided with a bearing 18 that rotatably supports the turbine shaft 12. The shaft moving mechanism 14 includes a bearing 18, a support rod (support member) 19 that supports the bearing 18, and a drive unit 20 that moves the support rod 19. The turbine shaft 12 and the rotating shaft 13 are connected via a joint unit 21. The joint unit 21 connects the turbine shaft 12 and the rotating shaft 13 inside the power generation pod 3.

  The joint unit 21 includes a first universal joint 22 connected to the end of the turbine shaft 12, a second universal joint 23 connected to the end of the rotary shaft 13, and the first universal joint 22 and the second universal joint. And a connecting rod 24 for connecting the joint 23. The angle of the turbine shaft 12 with respect to the connecting rod 24 is freely changed by the first universal joint 22. The angle of the connecting rod 24 with respect to the rotating shaft 13 is freely changed by the second universal joint 23.

  The bearing 18 is supported with respect to the power generation pod 3 via a support rod 19. The support rod 19 is a rod-shaped member and extends in the radial direction of the turbine 4. The longitudinal direction of the support rod 19 is arranged along the moving direction of the turbine shaft 12. In the state shown in FIG. 2, the support rod 9 extends in the Z direction. The support rod 9 may be disposed along other directions. One end of the support rod 19 is connected to the bearing 18. The bearing 18 moves integrally with the support rod 19. The other end of the support rod 19 is connected to the drive unit 20.

  The drive unit 20 includes, for example, an electric motor. The drive unit 20 is fixed to the side wall 25 of the power generation pod 3. The side wall 25 is a wall body that constitutes the cylindrical portion of the power generation pod 3. The drive unit 20 includes a power transmission mechanism that transmits the output of the electric motor to the support rod 19. The power transmission mechanism includes, for example, a gear (pinion) provided on the rotating shaft of the electric motor and teeth (rack) provided on the support rod 19. Thereby, the output of the electric motor is transmitted to the support rod 19. The support rod 19 moves in the longitudinal direction to move the bearing 18. The drive unit 20 may include, for example, a hydraulic cylinder. The drive unit 20 may move the support rod 19 in the longitudinal direction by a hydraulic cylinder. The shaft moving mechanism 14 may include a guide mechanism that guides the moving direction of the support rod 19.

  The generator 5 is supported by a support base 26 and is fixed to the side wall 25 of the power generation pod 3. The support base 26 and the drive unit 20 may be arranged at the same position, for example, in the circumferential direction of the turbine shaft 12. For example, the support base 26 and the drive unit 20 are supported from below in the vertical direction and fixed to the power generation pod 3. The support base 26 and the drive unit 20 may be arranged at different positions in the circumferential direction of the turbine shaft 12. Further, the drive unit 20 and the support rod 19 may be displaced in the direction in which the turbine shaft 12 extends.

  The shaft moving mechanism 14 moves the support rod 19 by the drive unit 20 to move the bearing 18 and the turbine shaft 12. The bearing 18 and the turbine shaft 12 move in the longitudinal direction of the support rod 19. Thereby, the turbine shaft 12 and the turbine 4 can be moved with respect to the power generation pod 3.

  Next, correction of the posture of the power generation pod 3 will be described with reference to FIG. The center of gravity G of the power generation device 2 is disposed on the front portion 3 a side with respect to the longitudinal direction of the power generation pod 3 from the center of the power generation pod 3. Further, as shown in FIG. 3D, the center of gravity G of the power generator 2 is disposed below the axis L5 in a state where the axis L5 extends in the X direction. The center of gravity G of the power generation device 2 may be at other positions. For example, the axis L5 extends along the central axis of the power generation pod 3.

  FIG. 3A shows a state where the axis L5 is inclined with respect to the X direction. For example, the rear portion 3b of the power generation pod 3 is disposed at a position higher than the front portion 3a of the power generation pod 3 on the axis L5. In this state, the hub 10 of the turbine 4 is disposed at a position higher than the front portion 3 a of the power generation pod 3.

  In the state shown in FIG. 3A, the axis L4 indicating the direction in which the turbine shaft 12 extends coincides with the axis L5, for example. From this state, the turbine shaft 12 is moved as shown in FIG. Specifically, the turbine shaft 12 is moved in a direction away from the center of gravity G in the direction intersecting the axis L5. The turbine shaft 12 is disposed at a position P1 (see FIG. 2).

  When the turbine shaft 12 is moved, the position at which the turbine thrust force P4 acts changes as shown in FIG. The turbine thrust force P4 is a force generated with respect to the power generation pod 3 by the rotation of the turbine 4, and is a force along the axial direction of the turbine shaft 12. The moment M acting on the power generation pod 3 changes as the position where the turbine thrust force P4 acts away from the center of gravity G in the direction intersecting the axis L5. Due to this moment M, a downward force is increased around the axis extending in the Y direction at the rear portion 3b of the power generation pod 3. Thereby, the rear part 3b of the power generation pod 3 is displaced downward, and the front part 3a of the power generation pod 3 is displaced upward. Then, as shown in FIG. 3D, the posture of the power generation pod 3 is corrected so that the axis L5 of the power generation pod 3 is along the X direction. For example, the postures of the power generation pod 3 and the turbine 4 may be corrected so that the direction of the ocean current FW is parallel to the axis L5 of the power generation pod 3.

  Next, a shaft movement control system for controlling the movement of the turbine shaft will be described with reference to FIG. The shaft movement control system includes a control unit 31. The control unit 31 is accommodated in the power generation pod 3. The control unit 31 is a computer composed of hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and software such as a program stored in the ROM. .

  Various sensors are connected to the control unit 31. Examples of the various sensors include a depth sensor 36 and a posture detection unit 37. Examples of the other various sensors include the rotation speed sensor and the pitch angle sensor described above. Further, as various sensors, a position detection unit (position meter) that detects the position of the turbine shaft 12 may be connected.

  The depth sensor 36 detects the depth of the power generation pod 3. The depth sensor 36 is mounted on the power generation pod 3. As the depth sensor 36, for example, a pressure sensor that detects water pressure can be used. Information regarding the depth of the power generation pod 3 detected by the depth sensor 36 is input to the control unit 31. The attitude detection unit 37 is a sensor that detects the attitude of the power generation pod 3. As the attitude detection unit 37, for example, a gyro sensor that detects the pitch angle (tilt) of the power generation pod 3 can be used. Information on the pitch angle of the power generation pod 3 detected by the attitude detection unit 37 is output to the control unit 31. The pitch angle of the power generation pod 3 is, for example, the angle of the axis L5 of the power generation pod 3 around the axis extending in the Y direction.

  The control unit 31 includes an input unit 32, a determination unit 33, a control unit 34, and a storage unit 35. A buoyancy adjustment mechanism 38 and a shaft moving mechanism 14 are electrically connected to the control unit 31.

  The input unit 32 inputs information output from various sensors. The input unit 32 inputs information related to the depth of the power generation pod 3 from the depth sensor 36. The input unit 32 inputs information related to the posture of the power generation pod 3 from the posture detection unit 37.

  The determination unit 33 determines whether to change the position of the turbine shaft 12 based on the information acquired by the input unit 32. For example, the determination unit 33 determines whether or not to change the position of the turbine shaft 12 based on the posture of the power generation pod 3. The determination unit 33 can determine to change the position of the turbine shaft 12 when the pitch angle of the power generation pod 3 is larger than the determination threshold. The determination unit 33 may determine whether to change the position of the turbine shaft 12 based on the depth of the power generation pod 3. For example, it may be determined that the position of the turbine shaft 12 is changed when the blade 11 protrudes from the water surface while the power generation pod 3 is floating near the water surface. Thereby, the blade 11 can be prevented from protruding from the water surface by lowering the position of the turbine shaft 12.

  When changing the position of the turbine shaft 12, the control unit 34 transmits a command signal to the shaft moving mechanism 14 to move the turbine shaft 12. For example, the control unit 34 calculates the moving direction and moving amount of the turbine shaft 12. The control unit 34 transmits a command signal related to the moving direction and moving amount of the turbine shaft 12 to the turbine shaft 12. Further, the control unit 34 may transmit a command signal to the buoyancy adjusting mechanism 38 to change the depth of the power generation pod 3 in conjunction with the movement of the turbine shaft 12. Further, the control unit 34 may change the rotational speed of the turbine 4 in conjunction with the movement of the turbine shaft 12. For example, the turbine thrust force P4 acting on the power generation pod 3 may be changed by changing the rotation speed of the turbine 4.

  The storage unit 35 stores information input to the input unit 32. In addition, the storage unit 35 stores information related to the determination threshold used by the determination unit 33. The storage unit 35 stores information necessary for calculating the moving direction and the moving amount of the turbine shaft 12. Examples of necessary information include information related to the position of the center of gravity G of the power generation device 2 and information related to the turbine thrust force.

  Next, the procedure of turbine shaft movement control executed by the control unit 31 will be described with reference to the flowchart shown in FIG. Here, a case where the turbine shaft 12 is moved to change the posture of the power generation pod 3 will be described.

  First, the attitude detection unit 37 detects the pitch angle of the power generation pod 3 as information on the attitude of the power generation pod 3 (step S1). The input unit 32 of the control unit 31 inputs information regarding the posture of the power generation pod 3 detected by the posture detection unit 37.

  The determination unit 33 of the control unit 31 determines whether or not to change the position of the turbine shaft 12 (step S2). The determination unit 33 determines to change the position of the turbine shaft 12 when, for example, the pitch angle of the power generation pod 3 exceeds the determination threshold (step S2; YES). The determination unit 33 determines that the position of the turbine shaft is not changed when the pitch angle of the power generation pod 3 is equal to or less than the determination threshold (step S2; NO). If the position of the turbine shaft 12 is to be changed, the process proceeds to step S3. If the position of the turbine shaft 12 is not to be changed, the process here is terminated.

  In step S <b> 3, the control unit 34 of the control unit 31 transmits a command signal to the shaft moving mechanism 14 to control the shaft moving mechanism 14 and change the position of the turbine shaft 12. For example, when the front portion 3a of the power generation pod 3 is in a downward posture as shown in FIG. 3A, the position of the turbine shaft 12 is moved to the upper position P1 (see FIG. 2). When the front portion 3a of the power generation pod 3 is in an upward posture, the position of the turbine shaft 12 is moved to the lower position P2.

  Since such a power generation system 1 includes the shaft moving mechanism 14, the position of the turbine shaft 12 relative to the power generation pod 3 can be moved in the radial direction of the turbine 4.

  The shaft moving mechanism 14 moves the support rod 19 by the drive unit 20 to displace the bearing 18 and the turbine shaft 12. Thereby, the hubs 10 and 11 can be moved in the radial direction of the turbine 4, and the rotation center of the turbine 4 with respect to the power generation pod 3 can be moved.

  The power generation system 1 includes a joint unit 21, and the rotary shaft 13 of the generator 5 and the turbine shaft 12 are connected via a first universal joint 22 and a second universal joint 23. Thereby, in the state which displaced the turbine shaft 12 with respect to the rotating shaft 13, rotation of the turbine shaft 12 can be transmitted to the rotating shaft 13, and the rotating shaft 13 can be rotated to the surroundings of the axis line. In the power generation system 1, the relative position of the turbine shaft 12 with respect to the rotation shaft 13 can be changed while rotating the turbine shaft 12 and the rotation shaft 13.

  The power generation system 1 includes an attitude detection unit 37 that detects the attitude of the power generation pod 3 with respect to the X direction, and a control unit 34 that controls the position of the turbine shaft 12 based on the attitude of the power generation pod 3. The power generation system 1 can change the moment M acting on the power generation pod 3 by changing the position of the turbine shaft 12 and changing the position of the turbine 4. Thus, the inclination of the power generation pod 3 can be corrected by changing the moment M acting on the power generation pod 3.

  The present disclosure is not limited to the above-described embodiments, and various modifications as described below are possible without departing from the gist of the present disclosure.

  In the above embodiment, the case where the turbine shaft 12 is moved in the vertical direction (Z direction) in the radial direction of the turbine 4 is described, but the moving direction of the turbine shaft 12 is not limited to the vertical direction. The shaft moving mechanism may move the turbine shaft 12 in the Y direction, or may move the turbine shaft 12 in a direction inclined with respect to the Z direction and the Y direction. The shaft moving mechanism may include a plurality of support rods 19 extending in different directions. The shaft moving mechanism may move the driving unit 20 with respect to the power generation pod 3, for example. The shaft moving mechanism may be configured to include a drive unit 20 for each of the plurality of support rods 19.

  In the above embodiment, the turbine shaft 12 is moved with respect to the rotating shaft 13 of the generator 5, but the power generation system may have other configurations. The power generation system may include a generator moving mechanism that moves the position of the generator 5 relative to the power generation pod 3 in the radial direction of the turbine 4. Thereby, the turbine shaft 12 can be moved together with the generator 5. The generator moving mechanism may include, for example, a drive unit (electric motor, hydraulic cylinder) and a guide unit (guide groove, guide rail).

  In the above embodiment, the rotation of the turbine shaft 12 is transmitted to the rotating shaft 13 via the universal joint, but the power transmission mechanism that transmits the rotational force of the turbine shaft 12 to the rotating shaft 13 has other configurations. But you can. This power transmission mechanism may include, for example, a plurality of gears, a power transmission belt, a power transmission shaft, and the like.

  In the above embodiment, the submerged floating power generation system 1 is described. However, the water current power generation system may be a tidal power generation system, for example, or may be another power generation system using a water current. Moreover, the water current power generation system is not limited to the one installed in the sea, and may be installed in a river, a lake, or the like, or may be installed in another place. Further, the power generation system may be one that generates power while moving while connected to a moving body such as a ship.

1 Power generation system (underwater floating power generation system, water current power generation system)
2 Power generation equipment (water current power generation equipment)
3 Power generation pod 4 Turbine 5 Generator 12 Turbine shaft 13 Rotating shaft (Rotating shaft of the generator)
14 Shaft moving mechanism 18 Bearing 19 Support rod (support member)
20 drive unit 22 first universal joint 23 second universal joint 34 control unit 37 attitude detection unit

Claims (4)

A turbine,
A turbine shaft attached to the turbine;
A power generation pod including a generator that generates power by receiving the rotational driving force of the turbine shaft;
And a shaft moving mechanism capable of moving a position of the turbine shaft relative to the power generation pod in a radial direction of the turbine. The shaft moving mechanism is
A bearing rotatably supporting the turbine shaft;
A support member extending in a radial direction of the turbine and supporting the bearing;
The water current power generation system according to claim 1, further comprising: a drive unit that moves the support member in a radial direction of the turbine. A universal joint for connecting the rotating shaft of the generator and the turbine shaft;
The water current power generation system according to claim 1, wherein the turbine shaft is movable with respect to the rotating shaft. An attitude detection unit for detecting the inclination of the power generation pod with respect to the horizontal direction;
The water current power generation system according to any one of claims 1 to 3, further comprising a control unit that controls a position of the turbine shaft based on an inclination of the power generation pod.

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