JP7110926B2 - Attitude adjustment device for floating water current generator - Google Patents

Description

The present disclosure relates to an attitude adjustment device for a floating water current generator.

2. Description of the Related Art There is a power generation device including a power generator in a water-floatable pressure vessel (floating body) (see, for example, Patent Document 1). Such a power generation device includes a plurality of turbine blades that rotate in response to water flow, receives rotational driving force from the turbine blades, and generates power using a generator within the floating body.

Japanese Patent Publication No. 2014-534375

For example, when the front side of the floating body is positioned lower than the rear side with respect to the water flow, the downward force acting on the floating body due to the water flow may increase. When the downward force acting on the floating body increases, it becomes difficult to change the posture of the floating body, and it may become difficult to float the floating body. The present disclosure provides an attitude adjustment device for a floating water current generator that can change the attitude of a floating body.

A posture adjustment device for a floating water current power generation device of the present disclosure includes a first connecting portion provided at a first position of a floating body, a second connecting portion provided at a second position behind the first position of the floating body, The first mooring cable connected to the first connection part in a tensioned state, the second mooring cable connected to the second connection part in a non-tensioned state, and the connection switching capable of releasing the connection state of the first mooring cable a device;

In this attitude adjustment device for a floating water current generator, the connection switching device can release the connected state of the first mooring cable that has been connected in a tense state, and can moor the floating body with the second mooring cable in a tense state. In this attitude adjustment device for a floating water current power generation device, the connecting portion to which the mooring cable is connected in a taut state can be shifted rearward in the water flow direction. Thereby, the posture of the floating body can be changed so that the front side of the floating body is positioned higher than the rear side by changing the force acting on the floating body. As a result, the downward force acting on the floating body can be reduced and the upward force acting on the floating body can be increased, making it easier to float the floating body. In the attitude adjustment device of the floating water current power generation device of the present disclosure, it is possible to change the attitude of the floating body and float the floating body simply by releasing the connection state of the first mooring cable with the connection switching device. The tension state includes a state in which tension is acting to moor the floating body. A non-tension state includes a state in which a tension lower than that exerted in a tension state is applied. The upstream side of the water stream is the front side, and the downstream side of the water stream is the rear side.

A first distance between the first position and the center of gravity of the floating body in the longitudinal direction may be longer than a second distance between the second position and the center of gravity of the floating body. The distance from the second connecting portion to the center of gravity can be shorter than the distance from the first connecting portion to the center of gravity. As a result, the connection portion to which the mooring cable is connected in a tensioned state can be shifted to a position close to the center of gravity, so that the force acting to raise the front side of the float can be increased. As a result, the downward force acting on the floating body can be reduced and the upward force acting on the floating body can be increased.

In the longitudinal direction of the floating body, the second position may be a position between the first position and the center of gravity. As a result, the connecting portion to which the mooring cable is connected under tension can be shifted to a position closer to the center of gravity between the first position and the center of gravity. As a result, the downward force acting on the floating body can be reduced and the upward force acting on the floating body can be increased.

An attitude adjustment device for a floating water current generator of the present disclosure includes an attitude adjustment mechanism for moving the center of gravity of a floating body and a buoyancy adjustment mechanism for adjusting the buoyancy of the floating body, and the connection switching device includes the attitude adjustment mechanism and the buoyancy adjustment. If the mechanism fails, the first mooring line can be disconnected. In this attitude adjustment device for a floating water current power generation device, the attitude of the floating body can be changed by using the attitude adjustment mechanism and the buoyancy adjustment mechanism while mooring the floating body with the first mooring rope in a tensioned state during normal operation. . When the attitude adjustment mechanism and the buoyancy adjustment mechanism stop working, it is possible to change the attitude of the floating body and float the floating body simply by releasing the connection state of the first mooring cable using the connection switching device. becomes.

According to the present disclosure, it is possible to change the attitude of the floating body by changing the connecting portion to which the mooring cable in a taut state is connected.

1 illustrates a water current power generation device according to an embodiment of the present disclosure; FIG. FIG. 4 is a side view showing a power generation pod in a horizontal state; FIG. 4 is a side view showing the power generation pod in a downward posture; FIG. 10 is a side view showing the power generation pod with the first mooring cable disconnected. FIG. 10 is a side view showing the power generation pod in a horizontal state with the second mooring cable connected in a taut state; It is a block diagram which shows the controller of a water current generator.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are omitted.

As shown in FIG. 1, a water current power generation device (floating water current power generation device) 1 floats a floating body 2 in water, rotates a turbine 20 provided on the floating body 2 by a water flow FW, and generates electricity by rotating the turbine 20. It is a device that performs Hereinafter, the "water current power generation device 1" is referred to as the "power generation device 1". For example, the power generation device 1 is installed in the ocean and used to generate power using ocean currents. A floating body 2 is moored to an anchor 4 by a mooring cable 3 . The floating body 2 is configured by connecting two left and right power generation pods 21 with a beam 22 . The beam 22 is provided by, for example, horizontally arranging a rectangular plate-like body. One end of the mooring cable 3 is attached to the power generation pod 21, and the other end of the mooring cable 3 is attached to the anchor 4 installed on the bottom of the water.

The mooring rope 3 is a rope material for mooring the floating body 2 to the anchor 4, and is composed of a strong rope material such as a wire rope. A portion of the mooring cable 3 on the floating body 2 side is branched into two at a branch point P1 and connected to the left and right power generation pods 21, respectively. The end of the mooring cable 3 on the floating body 2 side is branched at a branch point P2 and connected to a plurality of positions of the power generation pod 21 . Specifically, it will be described later.

The anchor 4 is a structure for holding the floating body 2 so that it is not washed away by the water flow FW, and is made of concrete or metal, for example. The anchor 4 may be a sinker that maintains its position by the weight of a heavy structure, or may be of a type that maintains its position by using a supporting force such as a ground anchor. Note that the water current generator 1 is provided with a power transmission cable for transmitting power generated by the floating body 2, but the illustration is omitted for convenience of explanation. The power transmission cable is connected, for example, to a ground power system.

As shown in FIG. 2 , the power generation pod 21 is constructed by providing the turbine 20 at the rear of the main body 211 . The main body 211 of the power generation pod 21 is composed of, for example, a hollow cylindrical body with closed front and rear parts. In the present embodiment, "front" means the upstream portion of the water flow FW, and "rear" means the downstream portion of the water flow FW. "Forward" means upstream of the water flow FW, and "backward" means downstream of the water flow FW. In the floating body 2 and the power generation pod 21, the front portion is the portion arranged on the upstream side of the water flow FW in water, and the rear portion is the portion arranged on the downstream side of the water flow FW.

The turbine 20 comprises blades 20a and a hub 20b. The blades 20a are blade members that receive the water flow FW and generate rotational force, and are provided in plurality on the outer periphery of the hub 20b in the radial direction. Although FIG. 2 shows a turbine 20 with two blades 20a, turbines with three or more blades 20a may be used. The hub 20b is rotatable around the longitudinal axis of the power generation pod 21. The hub 20b is attached to, for example, the rotating shaft 23a of the generator 23 and rotates integrally with the rotating shaft 23a.

The generator 23 is a device that converts the kinetic energy of rotation of the turbine 20 into electrical energy, and receives the rotational force of the turbine 20 to generate power. A power conditioner may be connected to the generator 23 . The generator 23 outputs generated power to the power conditioner. The power conditioner can adjust the power generated by the generator 23 and control the power generation operation. Adjustment of the generated power is performed by converting the generated power, which is AC power, into DC power, and then converting the DC power into AC power so as to obtain a desired frequency. A high-voltage power receiving unit may be connected to the power conditioner. The high-voltage power receiving unit transforms AC power output from the power conditioner.

In the power generator 1, the pitch angle of the blades 20a may be variable. The power generator 1 may include a blade pitch angle adjusting device 52 capable of adjusting the pitch angle of the blades 20a (see FIG. 6). The blade pitch angle adjustment device 52 includes, for example, a hydraulic drive device and a blade shaft. More specifically, a blade shaft is provided at the proximal end of each blade 20a. A drive is connected to the blade shaft. The drive is mounted, for example, in hub 20b. The drive includes, for example, a gear mechanism. A known mechanism can be used as the driving device. The driving device can be controlled by a controller 51, which will be described later, to rotate the blade shaft and adjust the pitch angle of the blade 20a to an arbitrary angle. The drive method of the blade shaft may be not hydraulic, but may be an electric drive method using an electric motor or the like.

As shown in FIG. 6 , the power generator 1 may include a buoyancy adjustment mechanism 53 . The buoyancy adjustment mechanism 53 is mounted on the power generation pod 21, for example. The buoyancy adjustment mechanism 53 may be mounted on a central pod (another pod) arranged between the plurality of power generation pods 21 . The buoyancy adjustment mechanism 53 changes the weight of the floating body 2 by injecting and discharging seawater. The buoyancy adjustment mechanism 53 includes a ballast tank provided inside the power generation pod 21, an inlet/outlet pipe connecting the ballast tank and the outside of the power generation pod 21, and a pump provided in the inlet/outlet pipe. A ballast tank is a water storage tank with a predetermined capacity. The pump pumps seawater into and out of the ballast tanks. The pump is driven by electric power generated by, for example, a generator. The pump may be driven by electrical power supplied using, for example, an electrical transmission cable. The pump may be driven by electric power charged in a battery mounted on the power generation pod 21 .

The power generator 1 may include an attitude adjustment mechanism 54 that adjusts the attitude of the floating body 2 . The attitude adjustment mechanism 54 changes the attitude (pitch angle) of the floating body 2 by changing the position of the center of gravity G of the floating body 2 . The pitch angle θ of the floating body 2 is the angle of the axis L2 of the power generation pod 21 with respect to the reference line L1 extending in the horizontal direction. The axis L2 is an imaginary straight line along the direction in which the rotating shaft 23a of the power generation pod 21 extends.

The attitude adjustment mechanism 54 includes, for example, a storage tank (first storage portion) arranged in the front portion of the power generation pod 21 and a storage tank (second storage portion) arranged in the rear portion of the power generation pod 21. . The attitude adjustment mechanism 54 includes piping and pumps connected to these storage tanks. The attitude adjustment mechanism 54 can change the position of the center of gravity G of the floating body 2 by moving the oil between the plurality of storage tanks. For example, when the total length of the power generation pod 21 is approximately 20 m, the movement range of the center of gravity G is approximately several tens of centimeters. The attitude adjustment mechanism 54 may move other liquids such as water instead of oil. A pump for moving liquids includes an electric motor as a drive source. This electric motor can be driven by electric power generated by a generator mounted on the power generation pod 21, for example. The electric motor may be driven by power supplied from the ground power grid.

For example, if both the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 become inoperable, water cannot be discharged from the ballast tank, and the center of gravity G cannot be moved. may become difficult to levitate. For example, when power supply to the power generation pod 21 and the water current generator 1 is cut off, both the buoyancy adjustment mechanism 53 and the posture adjustment mechanism 54 become inoperable. For example, when power cannot be transmitted from the power generation pod 21 to the power system on the ground, the power generator 23 must be stopped, and the power supply to the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 is cut off. and the attitude adjustment mechanism 54 are both inoperable. As a result, it becomes difficult for the floating body 2 to rise to the water surface.

As shown in FIG. 2, the power generation pod 21 includes a plurality of connection portions (first connection portion 11, second connection portion 12), and mooring cables (first mooring ropes 31, A second mooring line 32) is connected. The power generator 1 includes an attitude adjustment device 30 capable of adjusting the attitude of the floating body 2 in the event of an abnormality. The attitude adjustment device 30 of the power generation device 1 includes a first connection portion 11 provided at a first position P21 of the power generation pod 21, a second connection portion 12 provided at a second position P22 of the power generation pod 21, A first mooring cable 31 connected to the first connection section 11, a second mooring cable 32 connected to the second connection section 12, a connection switching device 33 capable of releasing the connection state of the first mooring cable 31, Prepare. The attitude adjustment device 30 of the power generator 1 may be used to adjust the attitude of the floating body 2 during normal operation.

The first position P21 and the second position P22 are different positions in the direction in which the axis L2 of the power generation pod 21 extends. The direction in which the axis L2 extends is along the front-rear direction of the floating body 2 . The first position P21 and the second position P22 are positions below the power generation pod 21, for example. The first position P21 is a position on the front side of the center of gravity G of the floating body 2 . The center of gravity G of the floating body 2 may, for example, be arranged substantially at the center in the direction in which the axis L2 of the power generation pod 21 extends, or may be at a position shifted from the center. The first position P21 is arranged in front of the power generation pod 21 .

The second position P22 is a position behind the first position P21. A first distance L21, which is the distance between the first position P21 and the center of gravity G, is longer than a second distance L22, which is the distance between the second position P22 and the center of gravity G, in the direction in which the axis L2 extends. The second position P22 is a position between the first position P21 and the center of gravity G in the direction in which the axis L2 extends. The second position P22 may be, for example, a position behind the center of gravity G (on the turbine 20 side). The second position P22 may be the same position as the center of gravity G in the direction in which the axis L2 extends. The first position P21 and the second position P22 may be the same position or different positions in the circumferential direction of the power generation pod 21, for example. The circumferential direction of the power generation pod 21 is the circumferential direction of an imaginary circle centered on the axis L2.

The first mooring rope 31 and the second mooring rope 32 are provided at the end of the mooring rope 3 on the power generation pod 21 side. The mooring cable 3 includes a first mooring cable 31 and a second mooring cable 32 branched at a branch point P2. The first mooring cable 31 is normally connected to the first connection portion 11 in a tensioned state. The normal state is, for example, a state in which the generator 23 is generating power. Normal times do not include abnormal times. The abnormal state includes, for example, a power failure state, and the power failure state includes a state in which the generator 23 cannot generate power, a state in which the power generated by the generator 23 cannot be transmitted to the ground side, and the like. The abnormal state includes a state in which the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 are inoperable. The tension state of the first mooring rope 31 includes a state in which a tension capable of mooring the floating body 2 is acting on the first mooring rope 31 .

The second mooring cable 32 is normally connected to the second connection portion 12 in a non-tensioned state. The non-tensioned state of the second mooring cable 32 includes a state in which tension lower than the tension acting in the tensioned state is acting on the second mooring cable 32 . For example, the tension acting on the non-tensioned second mooring line 32 is lower than the tension acting on the tensioned first mooring line 31 . During normal operation, the floating body 2 is moored to the anchor 4 via the first mooring cable 31 . In normal times, the tension necessary for mooring the floating body 2 does not act on the second mooring cable 32 .

The second connection portion 12 includes a fixture for attaching the second mooring cable 32 to the power generation pod 21 . The fitting may be, for example, a U-shaped fitting, a ring-shaped fitting, or other shapes. The second connection portion 12 may be joined to the outer surface of the power generation pod 21 by welding or the like. The second connection portion 12 may be formed integrally with the power generation pod 21 .

The first connection portion 11 includes a fixture for attaching the first mooring cable 31 to the power generation pod 21 . The fitting may be, for example, a U-shaped fitting, a ring-shaped fitting, or other shapes. The connection switching device 33 may include the first connection section 11 .

The connection switching device 33 releases the connection state of the first mooring cable 31 in the event of an abnormality, for example. The connection switching device 33 may release the connection state of the first mooring cable 31 by removing the fixture of the first connection portion 11 from the power generation pod 21 . For example, an underwater acoustic isolation device can be used as the connection switching device 33 . The underwater acoustic detachment device connects the first mooring rope 31 when receiving the sound wave signal, and can drop the first mooring rope 31 when the sound wave signal is no longer received. The transmission unit for the sound wave signal is provided in the power generation pod 21, for example. In the event of an abnormality, for example, when power generation by the generator 23 stops, the transmission of the sound wave signal is stopped. For example, a command center on the ground side may transmit a signal to activate the underwater acoustic decoupling device and cause the first mooring rope 31 to drop.

The connection switching device 33 may include, for example, an electromagnet with a coil. Under normal conditions, a current is passed through the coil to generate a magnetic force to fix the first connecting portion 11. In an abnormal condition, the supply of current to the coil is stopped to reduce the magnetic force and the first connecting portion. 11 can be released. Thereby, the first mooring cable 31 is dropped. The connection switching device 33 may have other configurations. The connection switching device 33 may release the connection state of the first mooring cable 31 when receiving a signal indicating an abnormality. When the connection state of the first mooring rope 31 is released, the first mooring rope 31 is in a non-tensioned state, and the second mooring rope 32 is in a tensioned state.

Next, the action of the power generator 1 will be described. The power generation device 1 normally generates power by receiving the water flow FW while floating in the water. In a normal state, for example, as shown in FIG. 2, the axis L2 of the power generation pod 21 may be arranged along the reference line L1. In normal times, the front portion of the power generation pod 21 may be positioned lower than the rear portion of the power generation pod 21, and the front portion of the power generation pod 21 may be positioned higher than the rear portion of the power generation pod 21. may have been When the front portion of the power generation pod 21 is arranged at a lower position than the rear portion, it is referred to as a downward posture. A case in which the front portion of the power generation pod 21 is positioned higher than the rear portion is referred to as an upward posture.

As shown in FIG. 3, when the power generation pod 21 assumes a downward posture in an abnormal state, the floating body 2 receives a downward force due to the water flow FW. If the downward force increases, it may become difficult to float the floating body 2 . In the power generator 1, the connection switching device 33 releases the connection state of the first mooring cable 31 as shown in FIG. 4 in the event of an abnormality. As a result, the tension in the second mooring rope 32 is increased, and the second mooring rope 32 is in a tense state.

In such a power generator 1, the connecting portion to which the mooring cable is connected in a taut state can be changed from the first connecting portion 11 to the second connecting portion 12, and can be shifted rearward in the flow direction. As a result, the floating body 2 can generate a moment M that causes the front portion of the power generation pod 21 to move upward and the rear portion of the power generation pod 21 to move downward. By changing the force acting on the floating body 2, the front portion of the power generation pod 21 can be moved upward and the rear portion of the power generation pod 21 can be moved downward, as shown in FIG. Finally, the floating body 2 can be made into an upward posture. As a result, the downward force acting on the floating body 2 can be reduced and the upward force acting on the floating body 2 can be increased to float the floating body 2 . In the power generator 1 , only by releasing the connection state of the first mooring cable 31 by the connection switching device 33 , it is possible to change the attitude of the floating body 2 and float the floating body 2 .

Next, the controller 51 capable of controlling the attitude adjustment device 30 of the power generator 1 will be described with reference to FIG. The power generator 1 may include a controller 51 . The controller 51 is arranged inside the power generation pod 21, for example. The controller 51 is a computer including hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and software such as programs stored in the ROM.

Various sensors are electrically connected to the controller 51 . Various sensors include a depth sensor 55, an attitude detection sensor 56, and a power failure detection sensor 57, for example. The depth sensor 55 detects the depth of the power generation pod 21 . As the depth sensor 55, for example, a pressure sensor or the like that detects water pressure can be used. Information on the depth of the power generation pod 21 detected by the depth sensor 55 is output to the controller 51 . The attitude detection sensor 56 detects the attitude of the power generation pod 21 . As the attitude detection sensor 56, for example, a gyro sensor that detects the pitch angle of the power generation pod 21 can be used. Information on the attitude (pitch angle) of the power generation pod 21 detected by the attitude detection sensor 56 is output to the controller 51 . A power failure detection sensor 57 detects a power failure state of the power generator 1 . For example, a voltage sensor can be used as the power failure detection sensor 57 . The voltage sensor is connected to the power supply section of the power generator 1 . A power supply unit of the power generator 1 is connected to the power generator 23 and the power system. Information on the voltage detected by the power failure detection sensor 57 is output to the controller 51 .

A blade pitch angle adjustment device 52 , a buoyancy adjustment mechanism 53 and an attitude adjustment mechanism 54 may be electrically connected to the controller 51 . The blade pitch angle adjustment device 52 , buoyancy adjustment mechanism 53 and attitude adjustment mechanism 54 can operate based on commands output from the controller 51 . The blade pitch angle adjustment device 52 , the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 may operate based on commands output from a controller different from the controller 51 . The controller 51 can operate the blade pitch angle adjustment device 52, the buoyancy adjustment mechanism 53, and the attitude adjustment mechanism 54 based on signals output from the blade pitch angle adjustment device 52, the buoyancy adjustment mechanism 53, and the attitude adjustment mechanism 54. It may be determined whether or not

The connection switching device 33 may be electrically connected to the controller 51 . The connection switching device 33 can operate based on commands output from the controller 51 . Also, the emergency battery 35 may be electrically connected to the controller 51 . The controller 51 can operate by being supplied with power from the emergency battery 35, for example, in the event of an abnormality. The emergency battery 35 may supply power to the connection switching device 33 and the blade pitch angle adjusting device 52, for example.

The controller 51 includes a control section 58 , a determination section 59 and a storage section 60 . Based on signals output from various sensors, the buoyancy adjustment mechanism 53, and the attitude adjustment mechanism 54, the determination unit 59 can determine whether it is normal or abnormal. The control unit 58 can output a command to operate the connection switching device 33, for example, in the event of an abnormality. Thereby, the connection state by the 1st mooring cable 31 can be cancelled|released. The determination unit 59 may determine whether or not to release the connection state by the first mooring cable 31 based on the attitude of the floating body 2 in the event of an abnormality.

The control unit 58 may output a command to the blade pitch angle adjusting device 52 to change the pitch angle of the blade 20a in the event of an abnormality. For example, the pitch angle of the blades 20a can be changed to stop the rotation of the turbine 20 so as not to receive the water flow. The storage unit 60 stores, for example, information about a determination threshold value for determining whether or not there is an abnormality.

The power generation device 1 may determine whether or not the controller 51 is in an abnormal state, and operate the connection switching device 33 . The connection switching device 33 may be operated by detecting an abnormal state without being commanded by the controller 51 .

In the power generator 1 , the attitude of the floating body 2 can be changed by disconnecting the first mooring cable 31 in an abnormal state in which the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 do not operate. As a result, it is possible to avoid a state in which the floating body 2 does not float. The power generator 1 may not be equipped with a battery for operating the buoyancy adjustment mechanism 53 and the attitude adjustment mechanism 54 in the event of an abnormality. Therefore, the number of batteries that can be used in an emergency can be minimized, and the weight of the floating body 2 can be reduced.

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

For example, in each of the above-described embodiments, the case of using the floating body 2 in which the two left and right power generation pods 21 are connected by the beams 22 has been described, but the floating body is not limited to such a configuration. For example, the floating body may be provided with a central pod between two power generation pods 21 on the left and right, or may be configured with one power generation pod 21 . Further, it may be provided with three or more power generation pods 21 .

Further, in each of the above-described embodiments, the case where the first mooring ropes 31 and the second mooring ropes 32 are connected to the power generation pod 21 has been described, but the first mooring ropes 31 and the second mooring ropes 32 are connected to the floating body. 2 may be connected to a portion other than the power generation pod 21 . For example, the first mooring cable 31 and the second mooring cable 32 may be connected to beams 22 provided between the left and right power generation pods 21 .

Moreover, in each of the above-described embodiments, the case where the water current power generation device is installed in the sea has been described, but the water current power generation device according to the present invention may also be installed in water such as rivers and lakes. Even in this case, as long as power can be generated by water flow, it is possible to obtain the same effect as the water flow power generator according to each of the above-described embodiments.

Further, in the above-described embodiment, the first mooring rope 31 and the second mooring rope 32 branched from the branch point P2 closer to the floating body 2 than the branch point P1 were explained, but the first mooring rope 31 and the second mooring rope 32 may be branched at other positions. For example, the first mooring rope 31 and the second mooring rope 32 may be branched at the branch point P1. The first mooring cable 31 and the second mooring cable 32 may be branched from a branch point provided closer to the anchor 4 than the branch point P1.

Further, in the above-described embodiment, the first mooring rope 31 and the second mooring rope 32 are branched from the mooring rope 3 connected to the anchor 4, but the first mooring rope 31 and the second mooring rope 32 are 4 may be connected separately.

Further, in the above embodiment, the case where the connection switching device 33 includes the first connecting portion 11 is described, but the connection switching device 33 may be provided in the middle of the first mooring cable 31, and may be branched. It may be provided at the point P2.

1 power generation device (floating water current power generation device)
2 Floating body 3 Mooring cable 11 First connecting part 12 Second connecting part 30 Attitude adjusting device 31 First mooring cable 32 Second mooring cable 33 Connection switching device 53 Buoyancy adjusting mechanism 54 Attitude adjusting mechanism G Center of gravity L21 of floating body First distance L22 Second distance P11 First position P12 Second position

Claims (4)

a first connecting portion provided at a first position of the floating body;
a second connecting portion provided at a second position behind the first position of the floating body;
A first mooring line connected to the first connection portion in a tensioned state;
a second mooring line connected to the second connection portion in a non-tensioned state;
A connection switching device capable of releasing the connection state of the first mooring cable ,
The floating body is moored to a structure placed on the bottom of the water by a mooring rope,
The mooring rope includes the first mooring rope and the second mooring rope branched at a branch point,
The first mooring rope and the second mooring rope are provided on a portion of the mooring rope on the floating body side,
The attitude adjustment device for a floating water current power generation device, wherein when the connection switching device releases the connected state of the first mooring rope in a tense state, the second mooring rope becomes tense and moors the floating body . 2. The method according to claim 1, wherein a first distance between the first position and the center of gravity of the floating body is longer than a second distance between the second position and the center of gravity of the floating body in the longitudinal direction of the floating body. Attitude adjustment device for floating water current generator. 3. The attitude adjustment device for a floating water current generator according to claim 2, wherein said second position is a position between said first position and said center of gravity in the longitudinal direction of said floating body. an attitude adjustment mechanism that moves the center of gravity of the floating body;
and a buoyancy adjustment mechanism that adjusts the buoyancy of the floating body,
The floating water current power generation according to any one of claims 1 to 3, wherein the connection switching device cancels the connection state of the first mooring rope when the attitude adjustment mechanism and the buoyancy adjustment mechanism do not operate. Device attitude adjustment device.

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