KR102134996B1 - Floating offshore wind power system - Google Patents

Abstract

The present invention relates to a floating offshore wind power generation system which allows lift force to be controlled by adjusting the angle of a blade connected to a rotating rotor so that wind power generation efficiency can be maximized by applying greater rotational force to the blade by using the lift force that is variable by adjusting the angle of the blade and which can increase output by increasing the length of the blade to the maximum.

Description

Floating offshore wind power generation system {FLOATING OFFSHORE WIND POWER SYSTEM}

The present invention relates to a floating offshore wind power generation system, and more specifically, in producing power using an offshore wind power generation system floating on the sea, it is possible to control lift through angle adjustment of a blade connected to a rotating rotor. By making it possible, the wind power efficiency can be maximized by applying a larger rotational force to the blade by using a lift force that is variable by adjusting the angle of the blade, and the variable blade can increase the power by increasing the blade length as much as possible. It relates to a floating offshore wind power generation system.

Generally, offshore wind power refers to a power generation method in which a wind turbine is installed in a water body such as a sea or a lake, and the kinetic energy of the wind blowing there is converted into mechanical energy by a rotating blade to obtain electricity. .

Due to the development of onshore wind power, as wind turbines have grown in size, the limitations of the installation site have been revealed, and noise problems, installation and transport problems, and visual landscapes have been caused by the large size of turbines. Therefore, offshore wind power was developed as a solution to the problems of onshore wind power generation.

Recently, a floating offshore wind power system that can be installed in the depths of 40 to 900[m] in the deep sea has been spotlighted.

However, this wind power generation technology has a high rate of use due to its excellent wind quality in a relatively constant wind direction, compared to other power generation technologies, but its economic efficiency is sharply reduced due to the high cost of facilities such as floating bodies and submarine power lines due to deep sea installation.

Therefore, in order to maximize economic efficiency, a method of increasing the size and length of a conventional blade (rotary blade) is very effective.

The relationship between the conventional blade length (R) and the blade weight (M) can be represented by approximately M = 0.5 * R ^2.53 . This shows that the blade weight increases exponentially with respect to the blade length, and since the supply price of the blade is proportional to the weight, the facility cost increases rapidly.

In addition, the relationship between air weight (m) and wind speed (V) affecting the kinetic energy (E) of the wind is E = ½ * m * V ² , from which E ∝ R ² , V ³ Is induced. That is, the kinetic energy of the wind is proportional to the square of the blade length and the cube of the wind speed.

Therefore, in order to maximize the power generation efficiency from the kinetic energy of the wind, as the blade length is increased, the kinetic energy can be increased to be proportional to the square and proportional to the wind speed cubed.

However, compared to the problem, the blade's own weight, which directly affects the blade supply price, increases exponentially, and the tower to support the weight of the blade is also huge, the installation is complicated, and the facility boiling increases rapidly. I had.

Accordingly, at present, there is a need for a wind power generation technology capable of maximizing power generation efficiency by dramatically minimizing overall weight while maximizing blade length.

Korean Patent Publication No. 10-2015-0131080

The present invention is to solve the above-mentioned problems, while maximizing the blade length while dramatically minimizing the weight, the wind power is proportional to the square of the blade length and the kinetic energy of the wind proportional to the cube of the wind speed to provide a greater rotational force to the blade. In order to maximize the efficiency of wind power generation, we intend to provide a floating offshore wind power generation system.

Floating offshore wind power generation system according to an embodiment of the present invention includes a floating body floating on the water surface and a wind power generation module provided on the upper side of the floating body, and the kinetic energy of the wind blowing toward the wind power generation module Is applied to one or more variable blades installed in the outer direction of the rotor of the wind power module, the variable blade is provided so that the angle can be adjusted, the rotational speed change of the rotor is adjusted by adjusting the angle of the variable blade It can be characterized as.

In one embodiment, the floating body is at least three or more floating pillars arranged in a triangular structure, a fluctuating variable installed at the center below the surface of the floating pillars, truss structure connecting the floating pillars to each other, the truss It may be characterized in that it comprises a turret (turret) provided in the structure, a mooring rope (mooring rope) connected to the turret and the submarine power line connected to the turret.

In one embodiment, the wind power generation module is a main tower upright on the floating body, a power generation module provided on an upper portion of the main tower, a generator directly connected to one or more inside the power generation module, and a rotor provided on the power generation module. One or more connecting pipes to be connected, provided at the distal end of the connecting pipe, a variable blade of a pneumatic structure whose angle is adjusted through rotation, provided between the rotor and the variable blade, a fixed blade of a structure for generating lift and the It may include a connecting pipe and at least one rotor support connecting the rotor to each other, and the kinetic energy of the wind applied to the variable blade is controlled as the angle of the variable blade is changed to the left or right.

In one embodiment, the present invention further includes an airfoil auxiliary tower connected to the shaft hub provided at the distal end of the rotor, wherein the airfoil auxiliary tower is directed to the side edge area toward the wind blowing direction based on the upright state. As it is positioned, as the lift is generated in the airfoil auxiliary tower by a direction blowing toward the airfoil auxiliary tower, the floating body may be rotated so as to face the direction in which the wind blows, so that the position may be moved.

In one embodiment, a variable airfoil auxiliary tower is provided in some areas of the airfoil auxiliary tower to increase lift generated in a side edge area of the airfoil auxiliary tower based on an upright state, and an angle of the variable airfoil auxiliary tower is provided. As it is changed to the left or right side, the floating body may be rotated so as to face the direction in which the wind blows, and thus the position may be moved.

According to one aspect of the present invention, the deeper the offshore wind power system is, the deeper the wind has a certain directionality, so there is little obstacle to the kinetic energy of the wind at sea compared to wind speed and land, which have a proportional effect on the kinetic energy. It is in the spotlight because it can solve the use rate and civil complaints and environmental problems that increase the power generation with excellent wind quality, but the high facility boiling due to the installation of the deep sea rapidly decreases economic efficiency.

Therefore, at present, while maximizing the blade length and dramatically minimizing the overall weight, the floating offshore wind power system using wind kinetic energy has the advantage of maximizing economic efficiency by generating power proportional to the blade length squared and the wind speed cubed. Have In addition, according to one aspect of the present invention, since a portion of the static dynamic load of the wind power module is concentrated on the shaft hub, the lift generated in the side edge area provided in the airfoil auxiliary tower and the airfoil auxiliary tower is appropriately increased. As the angle is changed to the left or right side of the variable airfoil auxiliary tower for the airfoil structure, the floating body itself is directed toward the wind blowing around the turret so that the rotor can always face the wind. It has the advantage of increasing the power production efficiency. In addition, in order to accelerate this effect, a wave variable variable can be installed below the center water surface of the floating body.

In general, the direction of the current flows similarly to the wind direction of the sea to a certain part of the depth of the sea, and using this flow energy, the rotor can always face the wind in the same way as the variable wing auxiliary tower, thereby improving the power production efficiency. Increase. In particular, considering that the air density is about 1,020 [kg/㎥] compared to about 1.225 [㎏/㎥], the wave variable variable 112a has a greater effect in a smaller area than the variable wing auxiliary tower 130a. You can pay.

1 is a view showing the overall configuration of a floating offshore wind power generation system 100 according to an embodiment of the present invention.
FIG. 2 is a view more specifically showing the floating body 110 shown in FIG. 1.
3 is a view more specifically showing the wind power module 120 shown in FIG.
4 is a view showing the airfoil auxiliary tower 130 shown in FIG. 1 in more detail.
5 is a view showing a cross-section of the variable wing auxiliary tower (130a) shown in FIG.

Hereinafter, preferred embodiments are provided to help understanding of the present invention. However, the following examples are provided only for easier understanding of the present invention, and the contents of the present invention are not limited by the examples.

1 is a view showing the overall configuration of a floating offshore wind power generation system 100 according to an embodiment of the present invention, Figure 2 is a view showing in more detail the floating body 110 shown in Figure 1 , FIG. 3 is a view more specifically showing the wind power generation module 120 shown in FIG. 1, and FIG. 4 is a view more specifically showing the airfoil auxiliary tower 130 shown in FIG. 1.

Referring to Figures 1 to 4, the floating offshore wind power generation system 100 according to an embodiment of the present invention may be largely composed of a floating body 110 and the wind power generation module 120. In addition, in one embodiment, the airfoil auxiliary tower 130 may be further included.

First, the floating body 110 is floating in the sea and serves to provide buoyancy so that the floating offshore wind power generation system 100 does not sink. The floating body 110 will be described with reference to FIG. 2.

Referring to Figure 2, the floating body 110 is at least one of the three or more floating pillars (111) having a triangular structure, the truss structure 112, the truss structure (112) connecting each of the floating pillars 111 to each other It may be configured to include a turret (113) provided in a protruding form, a mooring rope (114) connected to the turret (113) and stretched to the sea, and the submarine power line (115).

The floating column 111 serves to actively control the posture by aligning the center of gravity so that the floating offshore wind power generation system 100 is not biased or collapsed from the sea by filling or draining water therein.

At this time, at least three or more floating pillars 111 are formed in a triangular shape, so that the floating offshore wind power generation system 100 is not biased or collapsed to one side. The behavior of the wind power module 120 at the lower side of the floating column 111 due to the irregular wind load and the behavior of the floating body 110 due to the wave load from the irregular surface wave force form the floating body 110 irregular behaviors. The hydraulic drag plates 111a serving to passively attenuate by effectively using the drag force of water without inputting energy are respectively installed.

The truss structure 112 refers to a connection structure that connects each floating column 111 to each other, and serves to support and support each floating column 111 so as not to be damaged by strong waves, wind, and wind speed at sea. do. At this time, a wave variable variable 112a is provided below the central depth of the truss structure 112.

In general, the directional variable 112a flows in a direction similar to the direction of the sea to a certain part of the sea depth, and the rotor always looks at the wind in front of the wind like the variable wing auxiliary tower 130a using this flow energy. Power generation efficiency. In particular, considering that the air density is about 1,020 [kg/㎥] compared to about 1.225 [㎏/㎥], the wave variable variable 112a has a greater effect than a variable wing auxiliary tower 130a. You can pay.

On one side of the truss structure 112, the turret 113 is protruded in the outer direction.

Turret 113, the mooring rope 114 and the submarine power line when the floating body 110 rotates around the turret 113 in the direction to receive the maximum kinetic energy of the wind, the mooring rope 114 and the submarine power line While maintaining it so that it can be fixed without rotating, it serves to maintain the position so that the floating body 110 does not drift away from the current position or deviate significantly from the current position.

At this time, the mooring rope 114 is one side is fixed to the seabed, so the floating offshore wind power generation system 100 can rotate about the turret 113 from the current position or move to a certain radius, but the current position It plays a role in preventing it from drifting off or drifting away.

In addition, when the floating body 110 rotates around the turret 113, the mooring rope 114 is caught in the lower portion of the truss structure 112, and thus this part may interfere with the rotational motion. It has a structure that can be moved to the center to smoothly rotate.

Returning to FIG. 1 again, the wind power module 120 is provided on the upper side of the floating column 111, and the kinetic energy of the wind blowing in front is variable and fixed by the blades 123a, 123b, and the rotor and rotor hub 122a. , 122b) is rotated to convert it into mechanical energy, and is converted into electrical energy by a generator 122a directly connected to it to produce electric power. This will be described in more detail with reference to FIG. 3.

Referring to FIG. 3, the wind power generation module 120 includes a main tower 121 standing upright on any one of the three floating pillars 111 and a power generation module provided on the upper portion of the main tower 121 ( 122), one or more connecting pipes 123c connected to the power generation module 122 and the rotor 123 provided to be rotatable.

In addition, each connecting pipe 123c may be configured to include variable and fixed blades 123a and 123b.

The main tower 121 serves to support the loads of the power generation module 122, the rotor 123, the connecting pipe 123c, the variable and fixed blades 123a, 123b, and the rotor support 123g, and the length is limited. Does not work. The height of the main tower 121 is formed longer than the variable and fixed blades (123a, 123b) and the added length of the connecting pipe (123c).

Inside the power generation module 122, a generator 122a for converting the rotational force of the rotor 123 into electrical energy is built in, and at least two or more connecting pipes 123c are connected to the rotor 123. At this time, the rotor 123 is connected to the rotor 123 and the shaft hub 123f by a rotor support 123g, and the variable and fixed blades 123a, 123b and the connecting pipes 123c are provided with wind loads due to the kinetic energy of the wind. Rotor support (123g) for supporting is configured by connecting. The shaft hub 123f may be connected to the airfoil auxiliary tower 130, which will be described later.

The power generation module 122 is configured by directly connecting several generators 122a. In general, as the wind power generation system becomes larger, a generator suitable for it is developed and installed to convert mechanical energy to electrical energy. However, the new development and installation of a single large-scale generator has the advantage of reducing the load of the power generation module 122, but there is a lot of development cost. Since the present invention has a structure capable of sufficiently carrying the load of the power generation module 122, in order to solve this problem, one or more generators of commercially available products are directly connected to the required output of the generator to significantly reduce the cost. Can.

The connecting pipe 123c is in the form of a circular pipe. This will be described in more detail with reference to FIG. 3.

Referring to Figure 3, the connecting pipe (123c) is a fixed blade (123b) provided between the variable blade (123a), and the rotor (122a) and the variable blade (123a) located on the outer end of the connecting pipe (123c) Including.

The variable blade 123a means a rotating blade having an airfoil structure whose angle is adjusted through rotation in one direction, and appropriately applies the kinetic energy of the wind applied to the variable blade 123a by adjusting the angle of the variable blade 123a. By minimizing mechanical failure due to the rapid increase in rotor rotation speed, the efficiency is maximized.

Unlike the variable blade 123a, the fixed blade 123b means a rotating blade having a fixed airfoil structure in a state in which the connecting pipe 123c is twisted in a constant direction with a rotation axis, not a structure in which an angle is adjusted through rotation.

Therefore, a constant lifting force is always applied to the fixed blade 123b.

Returning to FIG. 1 again, the present invention may further include an airfoil auxiliary tower 130 for supporting the rotor 123 and automatically rotating the float 110 along the airflow. This will be described in more detail with reference to FIG. 4.

Referring to Figure 4, the airfoil auxiliary tower 130 is upright on the upper side of the floating body 110 and part of the static dynamic load of the wind power module 120 is concentrated on the shaft hub 123e to properly handle this load Exists for

And the cross section is formed in a shape corresponding to the cross section of the plane wing of right and left symmetry.

More specifically, the airfoil auxiliary tower 130 is formed in a form that generates lift, such as a cross section of an airplane wing whose cross section is symmetrical left and right. Therefore, even when the wind blows toward the side rather than the front side of the airfoil auxiliary tower 130, the floating body 110 connected to the lower side of the airfoil auxiliary tower 130 by airflow formed around the airfoil auxiliary tower 130 The turret 113 rotates naturally.

Since the floating body 110 is not fixed to the sea, the floating body 110 can rotate freely around the turret 113.

Due to the lift generated by the airfoil auxiliary tower 130, the floating body 110 naturally rotates around the turret 113, and accordingly, the front of the airfoil auxiliary tower 130 exactly matches the direction in which the wind blows. Is done.

That is, the structure of the airfoil auxiliary tower 130 has the advantage that the floating offshore wind power generation system 100 can always face the wind blowing direction and the front.

At this time, the lower part and the upper part of the airfoil auxiliary tower 130 are fixed, while some areas of the center are variable airfoil auxiliary for increasing lift generated in the side edge areas based on the state where the airfoil auxiliary tower 130 is upright. Tower 130a is provided.

The variable airfoil auxiliary tower 130a is rotated to the left and right as in the variable blade 123a described above, so that the angle is adjusted, so that the lift due to the airflow formed around the airfoil auxiliary tower 130 is maximized. That is, when the variable airfoil auxiliary tower 130a is bent toward one side (for example, clockwise), the wind resistance caused by the variable airfoil auxiliary tower 130a is generated while the floating body 110 is opposed to the opposite direction (for example, counterclockwise). Direction).

Conversely, when the variable airfoil auxiliary tower 130a is bent to one side (for example, counterclockwise), wind resistance is generated by the variable airfoil auxiliary tower 130a while the floating body 110 is opposed to the opposite direction (for example, a clock). Direction).

That is, the variable wing auxiliary tower (130a) has the advantage that the wind power module 120 is always facing the wind blowing direction and the front by directly changing the direction of the floating body (110).

At this time, the cross-section of the variable-wing type auxiliary tower 130a will be described with reference to FIG. 5 as follows.

5 is a view showing a cross-section of the variable wing auxiliary tower (130a) shown in FIG.

Referring to Figure 5, the variable wing auxiliary tower (130a) is formed in a form that generates a lift, such as the cross-section of the wing of the plane. Therefore, even when the wind blows toward the side instead of the front side of the variable wing type auxiliary tower 130a, the floating body connected to the lower side of the variable wing type auxiliary tower 130a by airflow formed around the variable wing type auxiliary tower 130a ( 110) will naturally rotate around the turret (113).

Since the floating body 110 is not fixed to the sea, and can be freely rotated, the floating body 110 rotates naturally around the turret 113 by the lift force generated by the variable-wing auxiliary tower 130a. As a result, the front of the variable-wing type auxiliary tower 130a can be controlled to exactly match the direction in which the wind blows.

That is, the structure of the variable wing type auxiliary tower 130a has the advantage that the floating offshore wind power generation system 100 can always face the wind blowing direction and the front.

Although described above with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. You will understand that you can.

100: floating offshore wind power generation system
110: floating body
111: floating pillar
111a: Water Force Plate
112: truss structure
112a: Facing Variable
113: Turret
114: mooring rope
115: submarine power line
120: wind power module
121: main tower
122: power generation module
122a: generator
123: rotor
123a: variable blade
123b: Fixed blade
123c: connecting pipe
123d: rotor hub
123e: rotor shaft
123f: Chub Herb
123g: Rotor support
130: airfoil auxiliary tower
130a: Variable wing auxiliary tower
130b: Fixed wing auxiliary tower

Claims (5)

A floating body floating on the water surface; And
Includes; wind power module provided on the upper side of the floating body;
The kinetic energy of the wind blowing toward the wind power module is applied to one or more variable blades installed in the outer direction of the rotor of the wind power module, but the variable blade angle is provided as the angle is adjustable. The rotation speed change of the rotor is adjusted by adjustment,
The wind power module,
A main tower upright to the floating body;
A power generation module provided on an upper portion of the main tower;
A generator directly connected to one or more inside the power generation module;
At least one connecting pipe connected to the rotor provided in the power generation module;
It is provided at the distal end of the connecting pipe, the variable blade of the airfoil structure to adjust the angle through rotation;
A fixed blade provided between the rotor and the variable blade and having a structure for generating lift force;
At least one rotor support connecting the connecting pipe and the rotor to each other; And
Includes; airfoil auxiliary tower connected to the shaft hub provided at the distal end of the rotor;
The airfoil auxiliary tower is positioned to face the direction in which the wind blows, based on the erected state. A floating offshore wind power system, characterized in that the position is moved by rotating to face the direction in which the wind blows.
According to claim 1,
The floating body,
At least three or more floating columns arranged in a triangular structure;
A fluctuating variable installed at the center of the water surface of the floating column;
Truss structures connecting the floating pillars to each other;
A turret provided in the truss structure;
A mooring rope connected to the turret; And
And a submarine power line connected to the turret.
According to claim 1,
Floating variable wind power generation system, characterized in that the kinetic energy of the wind applied to the variable blade is controlled as the angle of the variable blade is changed to the left or right.
delete According to claim 1,
In some areas of the airfoil auxiliary tower,
A variable airfoil auxiliary tower for increasing lift generated in a side edge region of the airfoil auxiliary tower based on an upright state is provided.
Floating floating wind power generation system, characterized in that the position is moved by rotating the floating body toward the direction in which the wind blows as the angle of the variable wing auxiliary tower is changed to the left or right.

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