JPWO2021002759A5

JPWO2021002759A5 -

Info

Publication number: JPWO2021002759A5
Application number: JP2022500577A
Authority: JP
Publication date: 2023-04-21

Claims

a hull-shaped buoyant body having a bow and a stern;
an elongated aerodynamic mast designed to project upwardly from said buoyant body and rotatably supported on said buoyant body about a horizontal transverse axis;
a rotor supported at one end of the mast for rotation about a longitudinally oriented horizontal axis of the buoyant body;
An offshore power generation system comprising a device for maintaining the attitude of the buoyant body so that the bow faces the direction of the wind and incoming waves,
said mast rotational support having a horizontal, laterally oriented axis of rotation passing through the center of gravity of said mast;
the center of gravity of the mast lies in the center plane of the buoyant body just above the aft end of the buoyant body when the buoyant body is in its operational position in calm waters;
The offshore power generation system, wherein the rotation axis of the rotation support of the mast is perpendicular to the central plane of the buoyancy body.

2. The offshore power generation system according to claim 1, wherein the center of buoyancy of said buoyant body is located at a point not more than 1/4 of the total length of said buoyant body from the rear end of said buoyant body.

3. The offshore power generation system according to claim 1, wherein the shape of said buoyant body in a horizontal plane is a shape surrounded by a triangle with a maximum width at the rear end of said buoyant body.

The offshore power generation system according to claim 3,
The shape of the buoyant body has a squareness modulus of about 0.35 and a compressive load on a surface of 3-6 tons/ ^m2 , 4-5 tons/m2 of the vertical projection of the buoyant body on the surface. ² , or on the order of 4.5 tons/ ^m2 ,
The squareness factor is given by the formula CB=V/L*B*T, where V is the underwater volume of the buoyant body, L is the length of the buoyant body, B is the maximum width of the buoyant body, and T is the maximum width of the buoyant body. is the draft of the buoyant body,
Offshore power generation system.

The offshore power generation system according to any one of claims 1 to 4, wherein the shape of the buoyant body is determined by a draft corresponding to a significant wave height in the sea conditions when the buoyant body was designed. power generation system.

The offshore power generation system according to any one of claims 1 to 5,
said rotor comprises a wind turbine surrounded by an aerodynamically designed wind turbine housing mounted/mounted to said mast;
the wind turbine housing includes a water ballast tank;
Offshore power generation system.

The offshore power generation system according to any one of claims 1 to 6 ,
the mast is rotatable between an operating position, a boarding and maintenance position, and a berthed position;
in the normal operating position with the rotor blades in the vertical plane, the mast forms an angle α with the vertical plane,
the angle α is 0 to 15 degrees, 6 to 12 degrees, or 9 degrees, facing backward from the buoyant body;
When the mast in the onboard mounting/maintenance position is with the rotor blades in a horizontal plane, the mast in the anchored position is such that the rotor blades are 45-50 degrees from the vertical plane to the buoyancy body. degree backward,
Offshore power generation system.

The offshore power generation system according to claim 6 or 7 ,
one or more devices for rotating said mast carrying a wind turbine between various positions;
said device for rotating said mast comprises rope means, a winch and/or a hydraulic cylinder mounted on said mast foundation;
said rope means comprises fiber ropes, wires, chains and/or hydraulic actuators for adjusting or changing the position of said mast;
Offshore power generation system.

The offshore power generation system according to claim 8 ,
The rotored mast is temporarily locked in the operative position by a releasable restraint mechanism,
the restraint mechanism includes a plurality of hydraulically actuated shear bolts positioned under the legs of the mast;
Offshore power generation system.

The offshore power generation system according to claim 9,
a lower portion of the mast in its normal operating position located in another well within the hull of the buoyancy body;
A device for rotating the mast between various positions with the wind turbine is also or additionally disposed within the well;
the well includes the restraining mechanism;
Offshore power generation system.

The offshore power generation system according to any one of claims 1 to 8 ,
a rotored mast maintains an approximate operating position by means of one or more damping devices that steer said mast to compensate for pitch motion of said buoyant body;
one or more damping devices including devices for steering the mast;
the device for steering the mast is controlled by a controller that receives signals from sensors such as wave sensors, wind sensors, etc.;
said controller actuating a damping device that steers said mast to maintain said mast in an operating position that is as stable as possible;
the device for steering the mast includes a hydraulic cylinder for compensating pitch motion of the buoyant body;
Offshore power generation system.

The offshore power generation system according to any one of claims 1 to 11 , wherein the device for keeping the buoyant body upwind comprises an anchor system arranged at the bow of the buoyant body; An offshore power generation system including possible thrusters located at least at the aft end.

The offshore power generation system according to any one of claims 1 to 12 ,
the pivotable support of the mast is carried by at least one support stand positioned behind the buoyant body;
the support stand has at least one leg having an aerodynamic cross-section fixed to the buoyant body;
the rotating support has a bearing housing disposed on top of the support stand;
Offshore power generation system.

A method for mounting and commissioning a mast with a rotor mounted in a buoyant body, comprising:
placing the rotor-mounted mast in a horizontal shipboard mounting position on a quay/shore mobile or on a water buoyancy device;
using ballast water for the buoyant body to receive the mast positioned adjacent to the mobile device;
pumping ballast water for weight transfer of the rotor-mounted mast;
Rotating a mast with rotor supported at its center of gravity by known devices to a desired position, i.e., an operating position, a shipboard and maintenance position, or a anchored position;
method including.

15. The method of claim 14 , further comprising:
engaging a plurality of hydraulic shear bolts to the legs of the mast in the normal operating position of the mast to lock the mast in the normal operating position;
The hydraulic shear bolt is moved out of engagement with the leg of the mast, thereby shifting the position of the mast relative to the horizontal in calm waters to the normal operating position of the mast in calm waters. actuating a plurality of hydraulic cylinders to adjust the angular position of the mast to maintain a position corresponding to ±2-4 degrees to compensate for the pitching motion of the buoyant body; or
steer the mast to a desired position, i.e., a normal operating position, a loading and maintenance position, a stowed position, by moving the hydraulic shear bolt out of engagement with the leg of the mast;
method including.