JP6949299B2 - Vertical wind power generation system - Google Patents

Description

The present invention relates to a wind power generation system that converts wind energy into blade rotational energy and that rotational energy into electrical energy, especially arm and blade reliability and blade rotation in a vertical wind power generation system. It is about a significant improvement in energy.

In recent years, from the viewpoint of protecting the natural environment by reducing harmful emissions and utilizing natural energy, the development of wind power generation systems using natural wind energy has been promoted in various countries around the world, and many systems have been installed and are in operation.
There are two types of wind power generation systems, horizontal type and vertical type.The horizontal type has a high blade rotation speed and generates wind noise, and the wind direction that can generate power is limited, so a mechanism that always follows the direction of the wind is required. It has problems such as becoming. On the other hand, the vertical type has a relatively low rotation speed and is less concerned about noise, and although it is not necessary to consider the direction of the wind, it is known that the conversion efficiency to rotational energy is relatively low.
In a vertical wind power generation system, in order to increase the rotational energy conversion efficiency from wind energy to electric power energy, the rotational energy conversion efficiency at the average wind speed, which has a relatively high appearance rate, should be increased, and the entire environmental conditions from breeze to strong wind should be increased. It is necessary to generate electricity at all times as much as possible. Here, the rotational energy conversion efficiency is defined as Cp as the rotational energy conversion efficiency, which is the conversion efficiency (%) for converting the kinetic energy of the wind passing through the blade wind receiving area per unit time into the rotational energy of the blade. Further, the value obtained by dividing this rotational energy (W) by the rotational speed ω (rad / s) is the rotational torque (Nm) due to the rotational force in the tangential direction of the entire vertical blade that becomes the cylindrical rotating body. The above wind energy is ^{represented by 1 / 2ρAV 3} , where A is the wind receiving area (m ² ) of the vertical blade, V is the wind speed (m / s), and ρ is the air density (Kg / m ³ ). Can be done.
In order to generate electricity from a breeze, it is necessary to have self-startability that can smoothly convert the kinetic energy of the wind into the rotational energy of the blade from the time of a breeze. It is necessary to build a vertical wind power generation system that is not mechanically and electrically damaged.
Therefore, as a configuration for improving the starting characteristics and power generation efficiency, a vertical wind power generation having a configuration in which a part of the airfoil is cut out to increase the drag force and a configuration in which the blade is rotated by using a cam or a link mechanism. A system has been proposed (Patent Document 1, Patent Document 2).
Specifically, in Patent Document 1, as shown in FIG. 17 and [0022] of Patent Document 1, since the notch portion 22 is formed at the trailing edge portion, when the blade 20 receives wind from the rear and rotates, A large air resistance is generated in the blade 20 by the cutout portion 22, and a rotational moment is generated in the blade 20 due to the semi-cylindrical offset cup type wind turbine effect, so that the starting torque of the wind turbine is generated.
Further, in Patent Document 2, as shown in FIG. 18, the magnitude of lift is changed by changing the angle of the blade 3 by using a cam or a link mechanism to increase the lift at low speed or to increase the lift generated at strong wind. It has a reduced configuration.

Japanese Patent No. 4514502 Japanese Unexamined Patent Publication No. 2006-152922

In the above-mentioned conventional vertical wind power generation system, an increase in power generation amount due to a change in the shape and angle of attack of the blade has been examined, but the strength and air resistance (rotational resistance) of the arm supporting the blade have been examined. Not.
The rotation torque of the blade is relatively small when the rotation speed is low, and increases sharply as the rotation speed increases. Therefore, if the air resistance of the arm is large in a state where the rotation speed is low, problems such as the blade not rotating or the rotation speed not increasing even if the blade is rotated occur.
Further, the air resistance of the arm is considered to be proportional to the square of the rotation speed, and the air resistance increases as the rotation speed increases. Therefore, in order to increase the power generation efficiency, it is necessary to reduce the air resistance with respect to the rotation torque of the blade even when the rotation speed is high.
In order to reduce the air resistance, it is essential to reduce the cross-sectional area and surface area (projected area), although it is related to the surface shape. However, by reducing the surface area, the mechanical strength is significantly reduced, so that the load due to the mass of the blade cannot be supported and the load due to the centrifugal force of the blade cannot be withstood.
As described above, in the vertical wind power generation system disclosed in the prior art, the surface area of the arm for supporting the load of the blade is large, and the surface area of the arm is increased to support the load due to the centrifugal force of the blade. .. Further, since the strength of the arm is limited with respect to the load due to the centrifugal force of the blade, the rotation speed of the blade cannot be increased and the power generation efficiency cannot be increased.
Further, since the surface area of the blade is large, there are problems that the air resistance is large, the blade cannot be started to rotate in a breeze, and the power generation efficiency is poor in a strong wind.
In addition, since the efficient power generation efficiency has not been improved according to the wind speed, wind direction, and blade rotation speed (peripheral speed ratio), it has hardly contributed to the improvement of power generation efficiency under actual wind conditions. It has become.

The present invention has been made in view of such a situation, and the strength of the arm can be ensured against the load of the blade and the centrifugal force of the blade and the arm, and the blade is rotated from a low speed rotation. It provides a wind power generation system that can generate power, has high power generation efficiency, enables high-speed rotation of blades, and has excellent power generation efficiency and reliability.
The power P (output W) of the blade is the product of the rotational torque Q (Nm) and the rotational angular velocity ω (rad / sec), and has a relationship of P = Qω.

In the vertical wind power generation system according to the present invention, in order to solve the above-mentioned problems, a vertical blade composed of a plurality of straight blades and an arm for holding the vertical blade or the straight blade by a blade holding portion are provided. A shaft unit that is fixed to the arm and also has rotation of the arm, a generator that interlocks with the shaft unit and converts the rotational energy of the vertical blade into electrical energy, the vertical blade, the arm, and the arm. By connecting a pole that holds the shaft unit, a shaft unit fixing portion that is composed of bearings and the like to rotate and fix the shaft unit to the pole, and the arm and the shaft unit, a part of each of the arms is connected. It has an arm wire that supports the load and a blade wire that connects between the blade holding portions, and the load acting on the arm, the centrifugal force due to the rotation of the vertical blade, and the centrifugal force acting on the blade. Is configured to be significantly reduced.

The vertical wind power generation system according to the present invention is configured as described above, and in order to secure the strength of the arm that holds the vertical blade, a part of the load applied to the arm by the arm wire is held by the shaft unit. By doing so, it is possible to significantly improve the load capacity of the arm. As a result, the projected area of the arm can be reduced, and the air resistance during rotation can be significantly reduced.
In addition, by connecting each arm and a part of each straight blade with a wire, it is possible to significantly reduce the load generated by centrifugal force in the arm and blade, and the arm when the vertical blade rotates. It becomes possible to significantly reduce the load on the blade and the load on the blade, and it becomes easy to secure the strength of the arm and the blade. Furthermore, when designing to a specified allowable stress, the projected area in the rotation direction of the arm can be reduced, the air resistance during rotation of the arm can be significantly reduced, and the weight of the blade can be reduced. Become. At this time, the weight reduction of the blade leads to further weight reduction of the arm and reduction of the projected area.
In this way, this configuration has the effect of being able to significantly improve the power generation amount and power generation efficiency of the vertical wind power generation system and improve the reliability.

It is a perspective view which showed an example of the structure of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram of the top view which showed an example of the structure of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the cross-sectional structure of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the coupling method of the arm wire part of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the coupling method of the blade wire part of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the coupling method of the blade wire part of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the coupling method of the blade wire part of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the coupling method of the blade wire part of the vertical wind power generation system which concerns on Embodiment 1. FIG. It is a schematic diagram which showed the structural example of the arm unit of the vertical wind power generation system which concerns on Embodiment 1. FIG. It shows the prior art and is the schematic diagram which showed an example of the structure of the blade of the vertical wind power generation system. It shows the prior art, and is the schematic diagram which showed an example of the structure of the relative angle change by the link system of the vertical wind power generation system.

(History of obtaining one form of the present invention)
As a result of diligent research on the conventional vertical wind power generation system described in "Background Technology", the present inventor has found that the conventional vertical wind power generation system has a large configuration in which the blade diameter and the blade length are relatively long. When considered, the mass of the blade increases and the stress of the arm increases. At this time, if the allowable stress of the arm is to be satisfied, the cross-sectional area of the arm (projected area in the rotation direction) increases, the air resistance of the arm increases, and the amount of power generation and the power generation efficiency are significantly reduced.
On the other hand, in order to increase the amount of power generated by the vertical wind power generation system, the number of rotations of the generator according to the power curve set for each wind speed must be increased. Therefore, in order to increase the amount of power generation, the rotation speed of the blade is increased as the wind speed increases, but the centrifugal force generated at that time causes the blade and arm to receive a load in the radial direction, and the blade and arm are greatly deformed. Will be done. Since stress to withstand the load is required at this time, it is necessary to secure sufficient strength for both the blade and the arm in order to withstand the centrifugal force, but for that purpose, the cross-sectional area and mass of the blade and the arm increase too much. We faced a major problem that it was difficult to reduce the air resistance of the arm and it was not possible to increase the power generation efficiency and the amount of power generation.
Therefore, the present inventor has obtained the following findings as a result of repeated studies on this problem. That is, by converting the mass of the arm into a load in the axial direction of the shaft unit supported by the shaft unit using a wire, the stress of the arm can be reduced and the cross-sectional area of the arm (projected area in the rotational direction) can be reduced. Isn't it? At this time, it was found that by collecting the wires from each arm at substantially the same place in the shaft unit, the respective loads can be balanced and the shaft unit can be configured so that no bending moment is generated.
In addition, by directly connecting the tip of each arm affected by centrifugal force and the end of the blade with a wire, the tension generated by the centrifugal force can be balanced and canceled, and the stress applied to the arm and blade can be reduced. It is possible to significantly reduce the air resistance in the rotation direction of the arm as well as to significantly reduce the weight and reliability of the arm and blade, and high efficiency, large size and high output vertical wind power. We have found a configuration that realizes a power generation system and have arrived at the present invention. Then, the present invention provides the following aspects.

The vertical wind power generation system according to the first aspect of the present invention includes a vertical blade composed of a plurality of straight blades, an arm for holding the vertical blade or the straight blade by a blade holding portion, and the arm. It holds a shaft unit that is fixed and supports the rotation of the arm, a generator that interlocks with the shaft unit and converts the rotational energy of the vertical blade into electrical energy, and the vertical blade, the arm, and the shaft unit. An arm that supports a part of the load of each arm by connecting a shaft unit fixing portion composed of a pole, a bearing, etc. and rotating and fixing the shaft unit to the pole, and the arm and the shaft unit. It has a wire and a blade wire connecting between the blade holding portions, and significantly reduces the load acting on the arm, the centrifugal force due to the rotation of the vertical blade, and the centrifugal force acting on the blade. It has a structure.

According to the above configuration, in order to secure the strength of the arm that holds the vertical blade, the load capacity of the arm is greatly improved by holding a part of the load applied to the arm by the arm wire with the shaft unit. Is possible. As a result, the projected area of the arm can be reduced, and the air resistance during rotation can be significantly reduced.
In addition, by connecting each arm and a part of each straight blade with a wire, it is possible to significantly reduce the load generated by the centrifugal force of the arm and blade, and to the arm when the vertical blade rotates. It is possible to significantly reduce the load and the load on the blade, it is easy to secure the strength of the arm and the blade, and when designing to the specified allowable stress, the projected area in the rotation direction of the arm can be increased. It can be made smaller, the air resistance during rotation of the arm can be significantly reduced, and the weight of the blade can be reduced. At this time, the weight reduction of the blade has the effect of further reducing the weight of the arm and the projected area, and at the same time, greatly improves the power generation amount and power generation efficiency of the vertical wind power generation system and improves the reliability. It has the effect of being able to realize.

In addition, the vertical wind power generation system according to the second aspect of the present invention has a wire coupling portion that connects a plurality of the blade wires at a substantially rotation center in the configuration of the vertical wind power generation system according to the first aspect. It is configured to have.
With the above configuration, it is possible to balance the radial load due to the centrifugal force generated on the arm and the blade with each other, and the load can be significantly reduced by the centrifugal force applied to the arm and the blade, and the load can be significantly reduced. It is possible to balance the tension of the blade wire in the rotating surface of the blade.

Further, in the vertical wind power generation system according to the third aspect of the present invention, in the configuration of the vertical wind power generation system according to the first or second aspect, the wire connecting portion is formed from a ring or a polygonal ring. It is configured.
With this configuration, even when parts such as a pole, a generator, and a housing are arranged near the center of rotation, the blade wires can be connected to balance the centrifugal force, and the weight of the arm and the blade can be further reduced. The air resistance in the rotation direction of the arm can be reduced, and the amount of power generation and the power generation efficiency can be significantly improved. Furthermore, it becomes possible to realize a larger vertical wind power generation system.

Further, in the vertical wind power generation system according to the fourth aspect of the present invention, in the configuration of the vertical wind power generation system according to the first to third aspects, the arm wire has a predetermined angle and the shaft. It is configured to be fixed to the unit.
With this configuration, the ratio of the load applied to the arm to be supported by the shaft unit can be further increased, the weight of the arm unit can be further reduced, and the projected area in the rotation direction can be reduced. It is possible to increase the amount of power generation and to realize a highly reliable direct wind power generation system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the same or corresponding components will be designated by the same reference numerals throughout all the drawings, and the description thereof will be omitted.

(Embodiment 1)
The vertical wind power generation system according to the first embodiment will be described with reference to FIGS. 1 to 8. 1 to 8 are schematic views showing an example of the configuration of the vertical wind power generation system according to the first embodiment. FIG. 1 schematically shows a perspective view of the vertical wind power generation system according to the first embodiment. FIG. 2 schematically shows a configuration when the wind power generation system according to the first embodiment is viewed from above. FIG. 3 schematically shows a partial cross-sectional view of the wind power generation system according to the first embodiment. 4 to 8 show a partially enlarged view of FIG.

As shown in FIGS. 1, 2 and 3, the vertical wind power generation system 15 includes a vertical blade 2 composed of a plurality of straight blades 1, a blade coupling portion 3, an outer arm 4, an inner arm 5, and a blade wire. 6. Blade wire fixing part 7, blade wire connecting part 8, blade wire-caulking part 9, arm wire 10, arm wire fixing part 11, arm wire caulking part 12, shaft unit 13, hub 14, shaft unit fixing part 15, Bearing 16, flexible joint (coupling) 17, generator 18, brake disc 19, brake pad 20, housing 21, housing fixing part 22, wire ring 23, arm fixing part 24, pole 25, arm unit 26, buckle 27, It is composed of a tension regulator (turn buckle) 28 and a wire-clip 29. Anemometers and anemometers may also be installed (not shown). The anemometer (not shown) detects the wind speed around the vertical blade 2 (one or more), and the rotation speed detecting means of the vertical blade 2 (not shown) is the rotation speed of the vertical blade 2. Is detected, and the anemometer (not shown) detects the direction of the wind flowing into the vertical blade 2.
The vertical blade 2 is composed of a plurality of straight blades 1, and is predetermined to an arm unit 25 composed of an outer arm 4, an inner arm 5, and an arm fixing portion 24 by a blade coupling portion 3 attached to each straight blade 1. It is fixed at the angle of attack and held rotatably.
The hub 14 is fixed to the shaft unit 13 with bolts or a power lock, and the arm 24 is fixed. The shaft unit fixing portion 15 holds a plurality of bearings 16, and holds the shaft unit 13 rotatably at a predetermined height in the vertical direction. The shaft unit fixing portion 15 is fixed to the housing 21. Further, a generator 18, a brake pad 20, and a brake disc 19 are provided inside the housing 21. Further, the housing 21 is fixed to the pole 1 by the housing fixing portion 22.
The shaft unit 13 is connected to the shaft portion of the generator 18 by a flexible joint 17. Further, a brake disc 19 is fixed to the shaft unit 13, and a brake pad 20 fixed to the housing 21 (details are not shown) slows down or stops the rotation of the shaft unit 13.
The shaft unit 13 fixes and holds the arm unit including the outer arm 4, the inner arm 5, and the arm fixing portion 24, and supports the rotation of the arm unit 26. The shaft unit 13 is coupled (or integrated) with a rotating portion (rotor, shaft, etc.) of the generator 18 that converts the rotational energy of the vertical blade 2 into electric energy, and interlocks with the rotating energy of the vertical blade 2 to generate electricity. Convert to energy. At this time, the shaft unit 13 and the rotating portion of the generator 18 may be connected via a flexible joint 17 (details are not shown), and the flexible joint 17 may be a coupling, a gear, a speed reducer, a speed reducer, or the like. It is composed of any of. At this time, it is possible to match the rotation speed-output characteristic of the vertical blade 2 with the rotation speed-output characteristic of the generator 18 by the speed increase ratio or reduction ratio of the flexible joint 17.
The pole 25 fixes the housing 21 by the housing fixing portion 22, holds the shaft unit fixing portion 15, the shaft unit 13, the arm unit 26, and the vertical blade 2, and holds the shaft unit 13, the arm unit 26, and the vertical blade 1. Is held in a rotatable state.
The arm unit 26 is provided with an arm wire-fixing portion 11, and is coupled with an arm wire connecting portion 12 configured in the shaft unit 13 with an arm wire 10. The tension of the arm wire 10 and the angle with respect to the horizontal at this time determine how much of the mass of the arm unit 26 is converted into the axial load of the shaft unit 13.
Further, the arm wire 10 is fixed by the arm wire caulking portion 27 so as not to be loosened. At this time, the tension of the arm wire 10 may be adjusted, or an adjusting mechanism may be separately provided in the arm wire 10.
FIG. 4 is a diagram showing an example of the tension adjusting mechanism of the arm wire 10. The buckle 27 is fitted to the arm wire coupling portion 12 (I bolt) attached to the shaft unit 13, and the tension adjuster 28 (turnbuckle) is further attached. The arm wire 10 is attached to the other fitting portion of the tension regulator 28 by a wire clip 29. The tension of the arm wire 10 is adjusted by rotating the rotating portion of the tension regulator 28.
By connecting a part of each of the straight blade 1 and the outer arm 4 to each other with a blade wire 6 and applying tension, a part of the load generated by the centrifugal force applied to the straight blade 1 and the outer arm 4 is applied to the blade wire 6. Therefore, the load due to the centrifugal force applied to each of the straight blade 1 and the outer arm 4 is significantly reduced. The upper part of the vertical blade 1 above the blade coupling portion 3 is greatly deformed in the outer peripheral direction due to the load due to the centrifugal force. Further, as the angle formed by the outer arm 4 with the horizontal increases, the load acting in the horizontal direction due to the centrifugal force increases, and the outer arm 4 is greatly deformed with the connecting portion with the inner arm 5 as a fulcrum.
Since the centrifugal force applied to the straight blade 1 is significantly reduced by the blade wire 6, the stress of the vertical blade 1 made of aluminum, magnesium or FRP (CFRP, GFRP, etc.) can be significantly reduced, and the wall thickness and the like can be significantly reduced. Can be made thinner, so a significant weight reduction can be achieved. Further, since the stress of the arm unit 26 can be significantly reduced by reducing the weight of the vertical blade 1, the cross-sectional area of each of the arm units 26 can be significantly reduced. By reducing the cross-sectional area of each of the arm units 26, the projected area (surface area) in the rotational direction can be reduced, and the air resistance (load due to the Cd value) can be significantly reduced. In particular, since the rotation speed of the outer peripheral portion is high, the force due to air resistance becomes large. Since the rotational torque of the vertical blade 2 is significantly reduced due to this air resistance, the amount of power generation is lost, which leads to a decrease in the amount of power generation and the efficiency of power generation. Further, as the rotation speed of the vertical blade 2 increases, the reduction effect increases. In general, the control point of the rotation speed of the vertical blade 2 in MPPT (control method of the power curve of the wind turbine) increases as the wind speed increases, so that it can withstand a large wind speed and greatly increases the amount of power generation. (The amount of power generation increases in proportion to the cube of the wind speed).
Therefore, the blade wire 6 can significantly reduce the radial load due to the centrifugal force generated by the rotation of the vertical blade 2, thereby significantly improving the amount of power generation and the power generation efficiency.
FIG. 5 is a schematic view showing an enlarged view of the portion B of FIG. 1, and shows the configuration of the blade wire 6. The straight blade 1 is held by connecting the outer arm 4 of the arm unit 26 to the blade coupling portion 3 fixed to the straight blade 1. Further, the blade wire caulking portion 9 is fitted to the blade wire fixing portion 7 fixed to the blade connecting portion 3 to fix the blade wire 6. At this time, the blade wire 6 for the straight blade 1 and the outer arm 4 is fixed at one place of the blade coupling portion 3, but the straight blade 1 and the outer arm 4 may be connected individually.
Further, as shown in FIG. 6, the blade wire 6 may be fitted and fixed to the blade wire fixing portion 7 by a wire clip 29 instead of the blade caulking portion 9.
FIG. 7 is a diagram showing a configuration of a wire coupling portion 8 (cross clip) of the blade wire 6. By connecting the crossing blade wires 6 to each other at a substantially central portion, the tension generated in the blade wires 6 is stabilized, so that the radial load generated by the centrifugal force can be further reduced.
The method of connecting the wire connecting portion 8 of the blade wire 6 according to FIG. 7 is a cross clip, but as shown in FIG. 8, it may be in the shape of a ring like the wire ring 23, or it may be directly connected.
FIG. 8 is a diagram showing an example of a configuration in which the blade wire 6 is fixed to the wire ring 23. The wire connecting portion 8 formed on the blade wire 6 is fixed with bolts. By using the wire coupling portion 8 of the blade wire 6 as the wire ring 23, even if there is a pole 25 or a generator 18 in the center, each wire can be fixed without any problem.
Further, the tension of the blade wire 6 is adjusted by the tension adjuster 28 as in the arm wire 10. At this time, it is desirable that the tension regulator 28 is configured near the center where the rotation speed is as slow as possible from the viewpoint of reducing air resistance.
As described above, according to the configuration of the first embodiment, it is possible to realize a significant improvement in the amount of power generation and the power generation efficiency of the vertical wind power generation system 15.
Although the blade wire 6 and the arm wire 10 are each made of wire in the first embodiment, a rod-shaped or plate-shaped material made of metal or resin may be used.
In the first embodiment, the arm unit 26 is separated into an outer arm 4 and an inner arm 5, but as shown in FIG. 9, the effect does not change even if they are integrated.

From the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art.
Therefore, the above description should be construed as an example only and is provided for the purpose of teaching those skilled in the art the best aspects of carrying out the present invention. The details of its structure and / or function can be substantially changed without departing from the spirit of the present invention.

The present invention has excellent power generation amount and power generation efficiency and reliability due to a significant reduction in air resistance (rotational resistance), which makes it possible to significantly reduce the centrifugal force acting on the blade and arm as compared with the conventional invention. Realize an excellent vertical wind power generation system. Therefore, the present invention can be used, for example, in a vertical wind power generation system.

1 Straight wing 2 Vertical blade 3 Blade joint 4 Outer arm 5 Inner arm 6 Blade wire 7 Blade wire fixing part 8 Wire connecting part 9 Blade wire caulking part 10 Arm wire 11 Arm wire fixing part 12 Arm wire connecting part 13 Shaft unit 14 Hub 15 Shaft unit fixing part 16 Bearing 17 Flexible joint 18 Generator 19 Brake disc 20 Brake pad 21 Housing 22 Housing fixing part 23 Wire ring 24 Arm fixing part 25 Pole 26 Arm unit 27 Buckle 28 Tension adjuster 29 Wire-clip

Claims (4)

A vertical blade composed of a plurality of straight blades, an arm that holds the vertical blade or the straight blade by a blade holding portion, a shaft unit that is fixed to the arm and supports rotation of the arm, and the shaft unit. The shaft unit is rotated around the pole, which is composed of a generator that converts the rotational energy of the vertical blade into electrical energy, a pole that holds the vertical blade, the arm, and the shaft unit, and a bearing or the like. By connecting the shaft unit fixing portion to be dynamically fixed and the arm and the shaft unit, an arm wire that supports a part of the load of each of the arms and a blade wire that connects between the respective blade holding portions. A vertical wind power generation system, characterized in that the load acting on the arm, the centrifugal force due to the rotation of the vertical blade, and the centrifugal force acting on the blade are significantly reduced. The vertical wind power generation system according to claim 1, further comprising a wire connecting portion for connecting a plurality of the blade wires at a substantially rotation center. The vertical wind power generation system according to claim 2, wherein the wire coupling portion is composed of an annular ring or a polygonal ring. The vertical wind power generation system according to claim 1 to 3, wherein the arm wire is fixed to the shaft unit at a predetermined angle.

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