JP2003129936A - Wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind power generator capable of converting wind power into electric power more efficiently than a conventional wind power generator. SOLUTION: This wind power generator is provided with an outer peripheral wheel 4 having a cylindrical shape, an inner peripheral wheel 2 guided to an inner side of the outer peripheral wheel 4 and rotatable centered on a rotary shaft 8, an inner peripheral vane 3 fixed to the inner peripheral wheel 2 to rotate the inner peripheral wheel 2 by wind, and a synchronous generator 11 generating electric power by relative movement of the inner peripheral wheel 2 for the outer peripheral wheel 4. In this wind power generator 1 constituted in this way, a diameter of the synchronous generator 11 is large, relative velocity with rotary magnetic field and an armature is high, and the realization of large capacity and multipole of the generator is easy. As a result, the synchronous generator 11 can generate AC electric power having sufficient frequency and voltage, even if rotation speed of the inner peripheral wheel 2 is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind turbine generator, and more particularly to a wind turbine generator that uses a synchronous generator to generate electric power.

[0002]

2. Description of the Related Art Wind turbines have been used for a long time to generate rotational power from natural energy, and in recent years, wind power generators that convert wind power into electric power have been widely used. The wind turbine generator includes a wind turbine that converts wind power into rotation, and a generator that converts rotation into electric power. An induction generator is generally applied to the generator of the wind turbine generator. A wind turbine generator to which an induction generator is applied has a gear that has a constant number of rotations of a wind turbine and that converts it into a rotational movement suitable for a required frequency of AC power and transmits the rotational movement to the generator.

Induction generators have a simpler structure and are less expensive than synchronous generators. However, the gear is noisy and noisy. It also often causes breakdowns. The induction generator needs to be connected to the power transmission system to obtain electric power for excitation, and cannot be operated alone.
Further, in the induction generator, the torque fluctuates due to the fluctuation of the wind speed, and the output fluctuates. An induction generator is not an appropriate power source when viewed from the system side, since it causes disturbance such as inrush current and accompanying voltage drop when power is applied to the transmission system.
A wind turbine generator to which a synchronous generator capable of following fluctuations in wind speed is applied is desired.

FIG. 7 shows a wind turbine generator to which a known synchronous generator is applied. The wind power generator 101 is
The wind turbine 102, the synchronous generator 103, the tower 104, and the nacelle 105 are provided. The wind turbine 102 includes blades 106 and a wind turbine rotor 107. The tower 104 is fixedly constructed on the surface of the earth. The nacelle 105 is supported by the tower 104 so as to be rotatable about a vertical axis of rotation. The wind turbine 102 includes blades 106 and a wind turbine rotor 107. The wind turbine rotor 107 is rotatably supported by the nacelle 105 around a rotating shaft 109 via a bearing 108. The nacelle 105 rotates with respect to the tower 107 so that the rotating shaft 105 is parallel to the wind direction.

The synchronous generator 103 is arranged inside the nacelle 105. The synchronous generator 103 includes a rotor 11
0, a stator 111, and a generator rotor 112. The generator rotor 112 is the windmill rotor 1 of the windmill 102.
07, and is integrally connected to the rotor 110. The stator 111 is formed of a permanent magnet. The stator 111 is fixed to the nacelle 105 and the rotor 1
10 is arranged on the outer side of rotation.

When the wind turbine generator 101 receives wind,
The wind turbine 102 rotates at a rotation speed according to the wind power, and the synchronous generator 102 generates AC power having an arbitrary frequency and voltage. The AC power is once converted to DC, then converted into AC power having a required frequency and voltage using an inverter, and is transmitted to the grid with high quality. When the wind gust blows, such a wind turbine generator 101 can receive wind power by increasing the rotation speed, and has high strength.
Such a wind turbine generator 101 has better performance in low wind. A wind power generator that converts weak wind power into electric power more efficiently is desired.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wind power generator that converts wind power into electric power more efficiently. Another object of the present invention is to provide a wind turbine generator that reduces the size of the synchronous generator. Still another object of the present invention is to provide a wind turbine generator that generates power with a weaker wind.

[0008]

[Means for Solving the Problems] Means for solving the problems will be described below by using the numbers and symbols used in the embodiments of the present invention. These numbers and signs are added to clarify the correspondence between the description in [Claims] and the description in [Embodiments of the invention], and are described in [Claims]. It should not be used to interpret the technical scope of the claimed invention.

The wind power generator (1, 21, 4 according to the present invention
1) is a cylindrical outer peripheral ring (4, 24, 44) and is guided inside the outer peripheral ring (4, 24, 44) and rotatable about a rotation shaft (8, 28, 52). An inner peripheral wheel (2, 22, 42) and an inner peripheral blade (3, 23, which is arranged inside the inner peripheral wheel (2, 22, 42) and rotates the inner peripheral wheel (2, 22, 42) by wind. 43) and outer rings (4, 2)
Synchronous generators (11, 31, 5) that generate electricity by relative movement of the inner peripheral wheels (2, 22, 42) with respect to 4, 44)
4) and are provided. Such a wind turbine generator (1,
21 and 41), the diameter of the synchronous generator (11, 31, 54) is large, the relative speed between the rotating field and the armature is large, and it is easy to increase the capacity and increase the number of poles of the generator. As a result, the synchronous generators (11, 31, 54) are
Even when the rotation speed of 2) is slow, it is possible to generate AC power with sufficient frequency and voltage.

The wind turbine generator (21) according to the present invention preferably further comprises a tower (26) supporting the outer ring (24). The fixed outer ring (24) eliminates the need for slip rings (14, 57) to continuously make electrical contact between moving objects.

The wind turbine generator (1) according to the present invention is further rotatably mounted on the outer peripheral ring (4) about the rotary shaft (8).
It is preferable to include a tower (6) for supporting the outer peripheral ring (4) and a peripheral blade (5) arranged outside the peripheral ring (4) to rotate the peripheral ring (4) by wind. The weight can be reduced as compared with the case where the outer peripheral blade (5) is rotatably supported on the outer side.

The wind turbine generator (41) according to the present invention further comprises a cylindrical outer peripheral ring (47), a tower (48) for fixing and supporting the outer peripheral ring (47), and an outer peripheral ring (47). 47), which is guided inside and is rotatable about the rotation shaft (52), and an air flow which is provided between the outer inner peripheral ring (46) and the outer peripheral ring (44). Therefore, it is preferable from the viewpoint of strength that the outer peripheral blade (45) that rotates about the rotating shaft (52) is provided.

Outer rings (4, 4) for the tower (6, 48)
The rotation direction of 44) is opposite to the rotation direction of the inner peripheral ring (2, 42) with respect to the tower (6, 48). The synchronous generator (11, 54) converts the relative motion of the armature (12, 56) and the rotating field (13, 55) into electric power. The synchronous generator (11, 54) increases the radius of the synchronous generator (11, 54) by rotating the armature (12, 56) and the rotating field (13, 55) in opposite directions. Without the armature (12, 56) and the rotating field (13, 5)
The relative speed with respect to 5) can be increased, and the size of the synchronous generator (11, 56) can be reduced.

Outer rings (4, 4) for the tower (6, 48)
The angular velocity of rotation of 44) is slower than the angular velocity of rotation of the inner ring (2, 42) with respect to the tower (6, 48). The lift force acting on the inner blades (3, 43) or the outer blades (5, 45) is proportional to the square of the relative velocity with the wind. In such a wind turbine generator (1, 41), there is little variation in the relative speed of the wind between the inner peripheral blades (3, 43) and the outer peripheral blades (5, 45).
The efficiency of converting wind force per unit area into torque is higher than that of a wind turbine with a pair of rotor blades.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a wind turbine generator according to the present invention will be described with reference to the drawings. In the wind turbine generator 1, as shown in FIG.
It is provided with. The inner peripheral ring 2 forms a cylindrical shape, and the inner peripheral blade 3 is integrally connected to the inside of the cylinder. The inner peripheral blade 3 converts wind force into rotational movement of the inner peripheral wheel 2. An outer peripheral ring 4 is provided outside the inner peripheral ring 2.

The outer peripheral ring 4 has a cylindrical shape, and the inner peripheral ring 2 is slidably supported inside the cylinder. Outer peripheral blades 5 are provided outside the outer peripheral ring 4. The outer peripheral blades 5 convert wind power into rotational movement of the outer peripheral ring 4. Outer ring 4
The direction in which the wind receives and rotates is the direction opposite to the rotation direction of the inner peripheral ring 2. The outer peripheral ring 4 is slidably supported by a tower 6 fixed to the surface of the earth.

The tower 6, as shown in FIG.
The outer peripheral wheel 4 is rotatably supported about a rotary shaft 8 via a bearing 7. Between the inner ring 2 and the outer ring 4,
A bearing 9 is provided, and the inner peripheral ring 2 is supported by the outer peripheral ring 4 so as to be rotatable around a rotary shaft 8. A synchronous generator 11 is further provided between the inner peripheral wheel 2 and the outer peripheral wheel 4.

The synchronous generator 11 comprises an armature 12 and a rotating field 13. The armature 12 is integrally connected to the outer peripheral ring 4. The rotating field 13 is integrally connected to the inner peripheral ring 2. A slip ring 14 is provided between the outer peripheral ring 4 and the tower 6. Slip ring 14
Is composed of a fixed brush and a rotating conductor, and continuously connects the rotating synchronous generator 11 to the tower 3 side. The wind turbine generator 1 outputs electric power to the outside via the slip ring 14.

When the wind turbine generator 1 receives wind, the inner peripheral wheel 2 rotates at a rotation speed corresponding to the wind, and the synchronous generator 1
1 produces | generates the alternating current power of arbitrary frequencies. The alternating current power is once converted into direct current, then converted into alternating current power having a required frequency and voltage by using an inverter, and transmitted to the power transmission system. Such a wind turbine generator 1 is a synchronous generator 1
The diameter of 1 is large, it is easy to increase the number of poles, and the relative speed between the armature 12 and the rotating field 13 is large.

Since the inner peripheral wheel 2 and the outer peripheral wheel 3 rotate in opposite directions, the relative speed between the armature 12 and the rotating field 13 is large. The synchronous generator 11 has an armature 12
And the relative motion of the rotating field 13 is converted into electric power. As a result, weak wind power can be more efficiently converted into AC power with sufficient frequency and voltage without increasing the radius of the synchronous generator 11, and the wind power generator can be downsized.

The inner peripheral blade 3 and the outer peripheral blade 5 are arranged so that the rotational speed (angular velocity) of the outer peripheral wheel 4 is lower than the rotational speed of the inner peripheral wheel 2.
The pitch angles of and are set. The lift force acting on the inner peripheral blade 3 or the outer peripheral blade 5 is proportional to the square of the relative speed with the wind. Therefore, there is little variation in the relative velocity of the wind between the inner peripheral blade 3 and the outer peripheral blade 5, and the efficiency of converting the wind force per unit area into torque is high.

FIG. 3 shows another embodiment of the wind turbine generator according to the present invention. The wind turbine generator 21 is provided with an inner ring 22 and an inner blade 23. The inner peripheral ring 22 forms a cylindrical shape, and the inner peripheral blade 23 is formed inside the cylinder.
Are bound together. The inner peripheral blades 23 convert wind power into rotational movement of the inner peripheral ring 22. An outer peripheral ring 24 is provided outside the inner peripheral ring 22. The outer peripheral ring 24 forms a cylindrical shape, and the inner peripheral ring 22 is slidably supported inside the cylinder. The outer peripheral ring 24 is supported by a tower 26 fixed to the surface of the earth.

The tower 26 is integrally connected to the outer peripheral ring 4, as shown in FIG. A bearing 29 is provided between the inner peripheral ring 22 and the outer peripheral ring 24, and
Are rotatably supported by the outer peripheral ring 24 about a rotation shaft 28. A synchronous generator 31 is further provided between the inner peripheral wheel 22 and the outer peripheral wheel 24. Synchronous generator 31
Includes an armature 32 and a rotating field 33. The armature 32 is integrally connected to the outer peripheral ring 24. The rotating field 33 is integrally connected to the inner peripheral ring 22.

When the wind turbine generator 21 receives wind, the inner peripheral wheel 22 rotates at a rotation speed corresponding to the wind, and the synchronous generator 31 produces AC power of an arbitrary frequency. The alternating current power is once converted into direct current, then converted into alternating current power having a required frequency and voltage by using an inverter, and transmitted to the power transmission system. Such a wind turbine generator 21 can increase the diameter of the synchronous generator 31 and increase the number of poles. As a result, weak wind power can be converted into electric power more efficiently.

The wind turbine generator 21 does not require a slip ring because the armature 32 is fixed to the outer peripheral ring 24. Further, the direction of the wind turbine can be changed on the tower according to the wind direction, which is preferable.

FIG. 5 shows an embodiment of a wind turbine generator according to the present invention. In the wind turbine generator 41, an inner peripheral ring 42 is provided together with an inner peripheral blade 43. Inner ring 42
Form a cylindrical shape, and the inner peripheral blades 43 are arranged inside the cylinder. The inner peripheral blades 43 convert wind power into rotational movement of the inner peripheral wheel 42. An outer peripheral ring 44 is provided outside the inner peripheral ring 42. The outer peripheral ring 44 forms a cylindrical shape, and the inner peripheral ring 42 is slidably supported inside the cylinder.

Outside the outer peripheral ring 44, outer peripheral wings 45 are provided. The outer peripheral blades 45 convert wind power into rotational movement of the outer peripheral ring 44. The direction in which the outer peripheral ring 44 receives wind and rotates is the opposite direction to the rotation direction of the inner peripheral ring 42. Outer wing 4
An outer inner peripheral ring 46 is provided further outside of 5. The outer inner peripheral ring 46 is integrally connected to the outer peripheral blade 46. On the outer side of the outer inner ring 46, the outer ring 4
7 is provided. The outer peripheral ring 47 forms a cylindrical shape, and the outer inner peripheral ring 46 is slidably supported inside the cylinder. The outer peripheral ring 47 is supported by a tower 48 fixed to the surface of the earth.

As shown in FIG. 6, the tower 48 supports the outer peripheral ring 47 via a bearing 51. The outer peripheral ring 44 is rotatable around the rotation shaft 52. A bearing 53 is provided between the inner peripheral wheel 42 and the outer peripheral wheel 44, and the inner peripheral wheel 42 is rotatably supported by the outer peripheral wheel 44 about a rotation shaft 52. A synchronous generator 54 is further provided between the inner peripheral wheel 42 and the outer peripheral wheel 44. The synchronous generator 54 includes an armature 56 and a rotating field 5.
5 and. The armature 56 is integrally connected to the outer peripheral ring 42. The rotating field 55 is integrally connected to the inner peripheral ring 44.

A slip ring 57 is provided between the outer inner peripheral ring 46 and the outer outer peripheral ring 47. The slip ring 57 is electrically connected to the synchronous generator 54 by an electric wire 58. The slip ring 57 is formed of a fixed brush and a rotating conductor, and rotates the synchronous generator 54.
Are continuously electrically connected to the side of the fixed tower 48. The wind turbine generator 21 has a slip ring 57.
Power is output to the outside via.

When the wind turbine generator 41 receives wind, the inner ring 42 rotates at a rotation speed corresponding to the wind, and the synchronous generator 54 produces AC power of any frequency. The alternating current power is once converted into direct current, then converted into alternating current power having a required frequency and voltage using an inverter, and is transmitted to the grid. In such a wind turbine generator 41, the synchronous generator 54 has a large diameter, the number of poles can be easily increased, and the relative speed between the armature 56 and the rotating field 55 is large.

Since the inner ring 22 and the outer ring 23 rotate in opposite directions, the armature 56 and the rotating field 5
The relative speed with 5 is large. The synchronous generator 54 converts the relative motion between the armature 56 and the rotating field 55 into electric power. As a result, without increasing the radius of the synchronous generator 54,
It is possible to more efficiently convert weak wind power into AC power with sufficient frequency and voltage, and to downsize the wind power generator.

The pitch angle between the inner peripheral blade 23 and the outer peripheral blade 25 is set so that the rotational speed (angular velocity) of the outer peripheral wheel 44 becomes slower than the rotational speed of the inner peripheral wheel 22. The lift force acting on the inner blade 23 or the outer blade 25 has a relative velocity of 2 with respect to the wind.
Proportional to the square. Therefore, there is little variation in the relative velocity of the wind between the inner peripheral blade 23 and the outer peripheral blade 25, and the efficiency of converting the wind force per unit area into torque is high.

The wind power generator 41 is heavier than the wind power generator 1 by the weight of the outer inner peripheral ring 46 and the outer outer peripheral ring 47. However, the wind turbine generator 41 has an effect of having a large strength against a strong wind. Further, the direction of the wind turbine can be changed on the tower according to the wind direction, which is preferable.

[0034]

The wind power generator according to the present invention can convert wind power into electric power more efficiently.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a wind turbine generator according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a wind turbine generator according to the present invention.

FIG. 3 is a front view showing another embodiment of the wind turbine generator according to the present invention.

FIG. 4 is a sectional view showing another embodiment of the wind turbine generator according to the present invention.

FIG. 5 is a front view showing still another embodiment of the wind turbine generator according to the present invention.

FIG. 6 is a cross-sectional view showing still another embodiment of the wind turbine generator according to the present invention.

FIG. 7 is a cross-sectional view showing an embodiment of a known wind turbine generator.

[Explanation of symbols]

1: Wind power generator 2: Inner ring 3: Inner wing 4: Outer ring 5: Outer wing 6: Tower 7: Bearing 8: Rotation axis 9: Bearing 11: Generator 12: Armature 13: Rotating field 14: Slip ring

Continued front page    F-term (reference) 3H078 AA02 AA26 AA31 BB11 CC01                       CC22 CC44 CC47                 5H590 AA02 AA03 CA14 CC01 CC18                       CD03 CE01 FA01

Claims (6)

[Claims] 1. An outer peripheral ring having a cylindrical shape, an inner peripheral ring guided by the inner side of the outer peripheral ring and rotatable about a rotation axis, and the inner peripheral ring disposed inside the inner peripheral ring by wind. A wind power generator comprising: an inner peripheral blade that rotates a wheel; and a synchronous generator that generates electric power by relative movement of the inner peripheral wheel with respect to the outer peripheral wheel. 2. The method according to claim 1, further comprising: A wind turbine generator comprising a tower that supports the outer peripheral ring. 3. The tower according to claim 1, further comprising a tower that rotatably supports the outer peripheral ring around the rotation axis, and outer peripheral blades that are arranged outside the outer peripheral ring and rotate the outer peripheral ring by the wind. And a wind power generator. 4. The outer peripheral ring having a cylindrical shape, a tower for fixing and supporting the outer peripheral ring, and being rotatable inside the outer peripheral ring around the rotating shaft. And a peripheral blade that is interposed between the outer peripheral wheel and the outer peripheral wheel and that rotates around the rotation axis by the wind. 5. The wind turbine generator according to claim 3, wherein the outer peripheral ring is rotated in a direction opposite to a rotational direction of the inner peripheral ring. 6. The wind turbine generator according to claim 3, wherein a rotation speed of the outer peripheral wheel is lower than a rotation speed of the inner peripheral wheel.