WO2017043395A1

WO2017043395A1 - Wind power generation device

Info

Publication number: WO2017043395A1
Application number: PCT/JP2016/075527
Authority: WO
Inventors: 鈴木　政彦
Original assignee: 株式会社グローバルエナジー
Priority date: 2015-09-11
Filing date: 2016-08-31
Publication date: 2017-03-16
Also published as: JP6649727B2; KR20180053346A; CN108026896B; CN108026896A; JP2017053307A

Abstract

Provided is a wind power generation device with which power generation efficiency at low wind speeds can be markedly increased by causing a rotor to rotate at an accelerated rate. When a wind speed detection means 17 detects a predetermined average wind speed, a control means 4 performs control so that after a switching means 9 has switched a power-regeneration-type motor 3 to a motor mode and a rotor 2 has been rotated at an accelerated rate until the wind speed detection means 17 detects that the circumferential speed of the rotor 2 has reached a specified value, the motor 3 is switched by the switching means 9 to a power generator mode to generate power. When the wind speed detection means 17 again detects the predetermined average wind speed, the control means 4 repeats a control in which the switching means 9 again switches the motor 3 to the motor mode and the rotor 2 is caused to rotate at an accelerated rate.

Description

Wind power generator

The present invention relates to a wind power generator capable of improving power generation efficiency even under a low wind speed.

Wind power generators generally have a large mechanical loss, and at low wind speeds, the rotor is difficult to rotate smoothly due to the cogging torque of the generator, and the power generation efficiency is low. In order to solve this problem, the inventor of the present application has developed a vertical wind turbine generator including a wind turbine having lift type blades (see, for example, Patent Documents 1 and 2).

The vertical axis wind power generator described in

Patent Documents

1 and 2 includes a rotor having a pair of vertically long lift-type blades facing each other around the vertical main shaft, and the vertical main shaft is disposed at both upper and lower ends of each lift-type blade. By forming the inwardly inclined part toward the direction, the airflow that diffuses in the vertical direction along the inner surface of the blade is received by the inwardly inclined part, increasing the rotational force and increasing the lift (thrust). The rotor can be efficiently rotated even under a low wind speed so that the power generation efficiency can be improved.

Japanese Patent No. 4907073 JP 2011-169292 A

The vertical axis wind turbine described in the above-mentioned patent document improves the startability of the vertical axis wind turbine, can start the rotation of the rotor even at a slight wind speed of about 1 to 1.5 m / s, and the average wind speed is For example, it has a feature that it can efficiently generate power even at a low wind speed of about 2 m / s.

In addition, when the peripheral speed or rotational speed of the rotor reaches a certain value, the lift generated in the blade increases due to the Coanda effect, so that the rotation of the blade is accelerated and the stall due to the power generation load is less likely to occur. It also has the feature of being enhanced.

However, since the wind direction always changes, the wind speed suitable for the windmill does not continue for a long time, and the rotation speed of the rotor rotating under the low wind speed is changed to the peripheral speed at which the rotor can rotate efficiently by itself. If it can be accelerated, the power generation efficiency can be further increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wind turbine generator capable of significantly increasing power generation efficiency by accelerating and rotating a rotor under a low wind speed. Is.

According to the wind power generator of the present invention, the above problem is solved as follows.
(1) A windmill having a rotor having a plurality of blades, a power regeneration type motor connected to the main shaft of the rotor and switchable between a generator mode and a motor mode, and a peripheral speed or a rotational speed of the rotor are detected. A rotation speed detection means; a wind speed detection means for detecting an average wind speed toward the rotor; a switching means capable of selectively switching the power regeneration type motor to either a generator mode or a motor mode; Control means for controlling the rotational speed,
When the wind speed detecting means detects a predetermined average wind speed, the control means switches the electric power regeneration type motor to a motor mode, and the rotational speed detecting means allows the circumferential speed or rotational speed of the rotor. Until the rotor reaches a specific value, the rotor is accelerated to rotate, and the switching means controls the power regeneration type motor to switch to the generator mode to generate power, and the wind speed detecting means. When the predetermined average wind speed is detected again, the switching means switches the power regeneration type motor to the motor mode again, and accelerates rotation until the circumferential speed or rotational speed of the rotor reaches a specific value, The switching means repeatedly controls the power regeneration type motor to switch to the generator mode and generate power again.

According to such a configuration, the control means switches the power regeneration type motor to the motor mode by the switching means when the wind speed detection means detects the predetermined average wind speed, and the circumferential speed or rotation speed of the rotor is a specific value. The power regeneration type motor is controlled so as to generate power by switching to the generator mode after reaching an accelerating rotation, so that the power generation efficiency can be reduced even under conditions of low wind speed and low wind speed. Can greatly increase.

When the power regeneration type motor is switched to the motor mode, the cogging torque generated by the generator does not act on the main shaft, the rotor can be accelerated and rotated quickly by the motor, and the peripheral speed or rotational speed of the rotor can be increased. If the motor is accelerated until it reaches a specific value, the rotor is accelerated and rotated by lift even if there is no assistance from the motor. Therefore, the operation time in the motor mode is short and the power consumption to operate in the motor mode. Is less.

(2) In the above paragraph (1), the wind turbine is a vertical wind turbine or a horizontal wind turbine provided with a rotor having a plurality of lift-type blades formed with inclined portions at the tip.

According to such a configuration, the vertical axis wind turbine or the horizontal axis wind turbine having a rotor having a plurality of lift-type blades having inclined portions formed at the tip end portions of the inclined portion causes an airflow that diffuses toward the tip end against the inner surface of the blades. Since the rotational force can be increased to increase the lift force (thrust force), the rotor rotates from the low wind speed and the higher the wind speed, the higher the lift force (thrust force) generated on the blade by the Coanda effect. The rotor is accelerated and rotates efficiently. Therefore, the power generation efficiency can be kept high by setting the circumferential speed or rotational speed of the rotor to a value that is accelerated and rotated by the lift of the blade.

(3) In the item (1) or (2), the electric power generated by the photovoltaic power generation panel is used as a power source for operating the electric power regeneration type motor by switching to the motor mode.

According to such a configuration, it is not necessary to use the power generated in the generator mode as the power source operated in the motor mode, and the power generated by the generator can be used effectively.

According to the wind turbine generator of the present invention, the control means switches the power regeneration type motor to the motor mode by the switching means when the wind speed detecting means detects the predetermined average wind speed, and specifies the peripheral speed or rotational speed of the rotor. The power regeneration type motor is controlled to generate electricity by switching to the generator mode until it reaches the value of, so even if the power generation amount is small under low wind speeds where the rotor rotation speed is low Efficiency can be greatly increased.

It is a front view of the wind power generator of the present invention. It is an enlarged plan view of a rotor and an arm. FIG. 3 is an enlarged cross-sectional plan view taken along line III-III in FIG. 1. It is a flowchart for controlling the rotational speed of a windmill.

Embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a case where a vertical wind turbine having a blade rotation radius of 1 m and a blade blade length of 1.2 m is described will be described, but the present invention is not limited thereto.

FIG. 1 shows a wind turbine generator having a vertical wind turbine according to the present invention. The wind power generator 1 has a vertical rotor 2, a power regeneration motor 3, and control means for controlling the rotational speed of the wind turbine. 4 is provided.

A plurality of upper and lower portions of the vertical main shaft 5 of the rotor 2 are rotatably supported by a central portion of a support frame 6 erected on the upper surface of the foundation G via a bearing 6A. The inner ends of two

horizontal arms

7A and 7B are fixed to the radial symmetrical position of the upper part of the vertical main shaft 5, and the vertical direction is set to the outer ends of the upper and

lower arms

7A and 7B. A pair of left and right lift type blades (hereinafter abbreviated as blades) 8 and 8 facing each other are fixed to the inner side surfaces of the upper and lower ends. The

arms

7A and 7B and the blade 8 are made of, for example, fiber reinforced synthetic resin. The

arms

7A and 7B and the blade 8 can be integrally formed.

The shape of the blade 8 is substantially the same as the blade described in Japanese Patent No. 4907703 and Japanese Patent Application Laid-Open No. 2011-169292 developed by the inventors of the present application.
That is, the chord length of the blade 8 is set to 40% to 60% of the rotational radius of the blade 8, and the blade area is set large.

The cross-sectional shape of the main portion 8A excluding the upper and lower ends of the blade 8 is enlarged as shown in FIG. 3, and the blade thicknesses on the inner and outer sides of the blade thickness center line C of the main portion 8A are symmetrical to each other. Accordingly, the blade thickness center line C is set to be substantially overlapped with the rotation locus O of the blade thickness center of the blade 8.

As shown in FIG. 2, the planar shape of the entire main portion 8A is curved in an arc shape along the rotation locus O of the blade thickness center, and the inner side surface extends in the centrifugal direction from the bulging portion of the leading edge to the trailing edge. When the wind hits the inner surface from the rear, it is pushed forward.

The shape of the cross section of the main portion 8A is assumed to be close to a standard airfoil shape in which the blade thickness on the front side that is the rotation direction is thick and gradually becomes thinner toward the rear.

When the blade 8 rotates, the peripheral speed of the outer surface becomes larger than that of the inner surface due to the difference between the inner and outer turning radii of the blade 8, and the airflow passing rearward along the outer surface is larger than that on the inner surface. Faster than.

Therefore, the pressure of the airflow passing through the outer surface at the rear edge of the blade 8 is smaller than that of the airflow passing through the inner surface, and the outer surface of the rear edge of the blade 8 is caused by the Coanda effect on the outer surface. The blade 8 is pushed from the rear toward the front edge, and a thrust in the rotational direction acts on the blade 8 to rotate the blade 8.

As shown in FIGS. 1 and 2, inwardly inclined portions 8 </ b> B and 8 </ b> B that are inclined in an arc shape inward, that is, in the direction of the longitudinal main shaft 5, are formed at both upper and lower ends of the blade 8. Since the inwardly inclined portions 8B are formed at the upper and lower end portions of the blade 8, the airflow that tends to flow in the vertical direction along the inner and outer side surfaces of the main portion 8A as the blade 8 rotates causes the Coanda effect. Therefore, the rotor 2 passes along the inner and outer surfaces of the upper and lower inwardly

inclined portions

8B and 8B in the rear direction, that is, in the W direction in FIG. 2, and the rotor 2 has high rotational efficiency even under a low wind speed. Rotate.

The power regeneration type motor 3 described above is installed on the foundation G, and the lower end portion of the vertical main shaft 5 is connected to the rotor shaft.
For example, a known permanent magnet field DC motor is used as the power regeneration type motor 3, and a detailed description will be given later. A generator configured to generate power by rotation of the longitudinal main shaft 5 of the rotor 2 The motor can rotate the vertical main shaft 5 with a switching circuit 9 connected to the electric power regeneration motor 3. As the power regeneration type motor 3, a permanent magnet type AC synchronous motor can also be used.

The switching circuit 9 is connected to the first storage battery 11 via the controller 10 and is connected to the second storage battery 13 that stores the electric power generated by the solar power generation panel 12. The switching circuit 9 has a power generation circuit when the power regeneration type motor 3 is used as a generator and a motor circuit (not shown) when the power regeneration motor 3 is also used as a motor. By switching the direction of the current flowing to the regenerative motor 3 (see the arrow in FIG. 1), the power regenerative motor 3 is switched to the generator mode, and the generated power is stored in the first storage battery 11 or the power regenerative type. The motor 3 is switched to the motor mode, and this motor is operated by the electric power of the second storage battery 13.

The switching circuit 9 is electrically connected to a later-described generator / motor switching determination unit 16 in the control unit 4, and based on a determination signal output from the generator / motor switching determination unit 16, Can be selectively switched.

The electric power regenerative motor 3 is switched to the generator mode to generate electric power, and the electric power stored in the first storage battery 11 is supplied to an external DC load power source or is connected to an external AC load via a DC-AC inverter. Power is supplied to the power system.

The controller 10 has a function of controlling the current and voltage output to the first storage battery 11 or an external load power source by adjusting the output current amount generated by switching the power regeneration motor 3 to the generator mode. For example, immediately after startup of the rotor 2 or at a low wind speed at which the rotation speed of the rotor 2 is slow, control is performed so that the amount of output current is reduced, thereby reducing the power generation load applied to the generator. 2 stall can be prevented.

The control means 4 includes an average wind speed determination unit 14, a windmill peripheral speed determination unit 15, and a generator / motor switching determination unit 16.
The average wind speed determination unit 14 is connected to an anemometer 17 that is an anemometer for detecting the average wind speed of the wind toward the rotor 2 at fixed time intervals, and the average wind speed detected by the anemometer 17 is the average wind speed. When it is determined that the wind speed has reached a predetermined average wind speed after being input to the determination section 14 and processed by the central processing unit (CPU) 18 of the control means 4, the determination is made to the generator / motor switching determination section 16. Output a signal. Note that the average wind speed detection time by the anemometer 17 is preferably set at a relatively short interval of, for example, 10 seconds or less so that the power generation amount does not fluctuate greatly even at low wind speeds.

As will be described in detail later, the generator / motor switching determination unit 16 outputs a determination signal to the switching circuit 9 when the anemometer 17 detects a predetermined average wind speed, for example, 2 m / s, and the switching circuit 9 9 is switched from the power generation circuit to the motor circuit, and the power regeneration type motor 3 is operated in the motor mode.
A determination signal is also output to the generator / motor switching determination unit 16 based on data input to the wind turbine peripheral speed determination unit 15 from a rotation speed detection sensor 20 described later.

A gear 19 for measuring the rotational speed of the rotor 2 is attached at an appropriate position in the middle portion of the vertical main shaft 5, and the rotational speed of the gear 19 is detected by a rotational speed detection sensor 20, whereby the vertical main shaft is detected. The rotational speed of the rotor 2 can be detected via 5. Instead of the gear 19, for example, one or a plurality of convex portions may be provided on the outer peripheral surface of the vertical main shaft 5.
As the rotation speed detection sensor 20, for example, a non-contact type sensor such as a magnetic rotation speed detection sensor, an ultrasonic rotation speed detection sensor, or a rotary encoder is used.

The rotational speed of the vertical main shaft 5 detected by the rotational speed detection sensor 20 is input to the wind turbine peripheral speed determination unit 15 of the control means 4, and the central processing unit 18 of the control means 4 performs the rotor based on the input rotational speed. 2 is calculated. That is, since the outer circumference length (2πr) of the rotor 2 is determined from the rotation radius (r) of the blade 8 of the rotor 2, the outer circumference length (2πr) is multiplied by the rotational speed of the longitudinal main shaft 5. In this case, a peripheral speed (m / s) is obtained. The rotational speed detection sensor 20 and the windmill peripheral speed determination unit 15 correspond to the rotational speed detection means according to the present invention.

The peripheral speed of the rotor 2 can also be obtained by detecting the angular speed of the blade 8 with a sensor. That is, a value obtained by multiplying the angular velocity (rad / s) of the blade 8 by the rotational radius (r) is the peripheral speed of the rotor 2.

When the wind turbine peripheral speed determination unit 15 determines that the average peripheral speed of the rotor 2 has reached a specific value, for example, 5 m / s, it is output from the generator / motor switching determination unit 16 to the switching circuit 9. Based on the determination signal, the switching circuit 9 is switched from the motor circuit to the power generation circuit, and the power regeneration motor 3 is operated in the generator mode.

Next, a method for controlling the rotational speed of the wind turbine in the wind turbine generator 1 according to the above embodiment will be described with reference to the flowchart shown in FIG.
First, the average wind speed when the rotor 2 rotates and the generator / motor switching determination unit 16 operates in the generator mode is measured by the anemometer 17 (S1), and the central processing unit 18 of the control means 4 Based on the calculation processing result, the average wind speed determination unit 14 determines whether the average wind speed is a predetermined average wind speed, for example, 2 m / s or more (S2).

When the average wind speed determination unit 14 determines that the average wind speed is 2 m / s or more, a determination signal is output from the generator / motor switching determination unit 16 of the control means 4 to the switching circuit 9, and the determination signal The switching circuit 9 is switched to a motor circuit (S3).

As a result, the power regeneration type motor 3 that has been operating in the generator mode is switched to the motor mode and automatically started with the power supplied from the second storage battery 13 (S4), and the longitudinal main shaft 5 is forced. The windmill, that is, the rotor 2 is accelerated and rotated (S5). If it is determined that the average wind speed has not reached 2 m / s, the process returns to step S1, and the average wind speed is continuously measured.

When the electric power regeneration type motor 3 is switched from the generator mode to the motor mode, the cogging torque by the generator does not act on the longitudinal main shaft 5, and the rotor 2 can be quickly accelerated and rotated by the motor. Therefore, the operation time in the motor mode is short, and the power consumption of the second storage battery 13 operated in the motor mode is small.

The reason why it is determined whether or not the average wind speed is 2 m / s or more is that in the longitudinal rotor 2 including the lift-type blade 8 having the above-described shape, for example, the rotational radius of the blade 8 is 1 m, the blade length of the blade 8 is 1. This is because when the average wind speed is 2 m / s or more in the case of 2 m, the rotation of the rotor 2 is accelerated by the lift generated in the blades, and the generated power from the generator is rotated at a speed that can be output.

Therefore, when the rotor 2 is rotating at a low wind speed of about 2 m / s in average wind speed, if the power regeneration type motor 3 is switched to the motor mode and the rotation of the rotor 2 is accelerated rapidly, lift force is exerted on the blades. Is further accelerated, and then the power generation efficiency is increased when power is generated by switching from the motor mode to the generator mode.

After accelerating the rotation of the rotor 2 in the motor mode, the rotation speed detection sensor 20 detects the average rotation speed of the longitudinal main shaft 5, and based on the rotation speed, the central processing unit 18 converts the wind turbine, that is, the peripheral speed of the rotor 2. Then, the result is output to the wind turbine peripheral speed determining unit 15 (S6), and the wind turbine peripheral speed determining unit 15 reaches a specific value where the peripheral speed of the rotor 2 exceeds the average wind speed of 2 m / s, for example, 5 m / s. It is determined whether or not (S7).

The reason why it is determined whether or not the circumferential speed of the rotor 2 has reached 5 m / s is that in the vertical rotor 2 including the lift-type blade 8 having the above-described shape, the circumferential speed of the rotor 2 is 5 m / s. When it reaches, the lift (thrust) generated in the blade 8 is increased by the action of the inwardly inclined portions 8B at both the upper and lower end portions of the blade 8 and the Coanda effect, and the rotor 2 has a circumference exceeding the wind speed without the assistance of the motor. This is because, while accelerating to the speed, it efficiently rotates to generate power, and stalling due to the power generation load is less likely to occur.

For example, when the rotational speed of the rotor 2 when the peripheral speed is 5 m / s, the peripheral speed, the rotational speed, and the length of the outer periphery have the relationship as described above. ) Is 1 m, the outer peripheral length (2πr) of the rotor 2 is 6.28 m. Therefore, if the peripheral speed 5 m / s is divided by the outer peripheral length of 6.28 m and multiplied by 60 to be converted into a partial speed, the rotational speed of the rotor 2 is about 48 rpm.

When the wind turbine peripheral speed determination unit 15 determines that the peripheral speed of the rotor 2 has reached 5 m / s, a determination signal is transmitted from the generator / motor switching determination unit 16 of the control means 4 to the switching circuit 9. Based on the determination signal, the switching circuit 9 is switched to the power generation circuit (S8). Thereby, the electric power regeneration type motor 3 is switched from the motor mode to the generator mode and started (S9), and the generated electric power is stored in the first storage battery 11.

When the wind turbine circumferential speed determination unit 15 determines that the circumferential speed of the rotor 2 has not reached 5 m / s, the process returns to step S5, and the power regeneration type motor 3 is switched to the motor mode and the circumferential speed of the rotor 2 is changed. Continue to accelerate until the speed reaches 5m / s.

After switching the power regeneration motor 3 to the generator mode, the anemometer 17 measures the average wind speed again (S10), and when the average wind speed determination unit 14 detects an average wind speed of 2 m / s or less (S11), Returning to step S3, similarly to the above, the switching circuit 9 is switched to the motor circuit, the power regeneration motor 3 is switched to the motor mode again, and the rotor 2 is rotated at an accelerated speed. By repeating the steps S3 to S11 in a loop and controlling the rotational speed of the rotor 2, the power generation efficiency can be significantly increased.

As described above, in the wind turbine rotational speed control method according to the embodiment, the power regeneration type motor 3 that can be switched between the generator mode and the motor mode is connected to the longitudinal main shaft 5 of the rotor 2. When the rotor 2 is rotating at a low wind speed of about 2 m / s on average, the electric power regeneration type motor is designed so that the rotor 2 reaches a peripheral speed of 5 m / s that can be efficiently rotated while accelerating by itself. 3 is switched to the motor mode and accelerated rapidly. When the peripheral speed of the rotor 2 reaches 5 m / s, the rotational speed of the rotor 2 is set so that the power regeneration motor 3 can be switched to the generator mode to generate power. Therefore, the power generation efficiency can be increased without greatly changing the generated power even under the low wind speed where the rotational speed of the rotor 2 is low and the amount of power generated is small.

Further, the average peripheral speed of the rotor 2 when the power regeneration type motor 3 is switched from the motor mode to the generator mode is set to, for example, 5 m / s, which is a value that allows the rotor 2 to rotate efficiently while accelerating by itself. In other words, when the average peripheral speed reaches 5 m / s, stalling due to the power generation load is less likely to occur even if the motor is stopped, and it is not necessary to frequently switch the power regeneration motor 3 to the motor mode. It is possible to reduce the power consumption of the second storage battery 13 that is a driving power source.

Furthermore, since the electric power regeneration type motor 3 is connected to the vertical main shaft 5 and the motor 3 is switched to the motor mode by the switching circuit 9 to accelerate the rotation of the rotor 2, the rotor 2 is accelerated and rotated. There is no need to separately install a dedicated motor for controlling the motor, which is economical.
The present invention is not limited to the embodiment described above, and various modifications and changes such as the following can be made without departing from the scope of the present invention.

In the above embodiment, when it is detected that the average wind speed is 2 m / s, the power regeneration type motor 3 is switched to the motor mode and started to accelerate the rotation of the rotor 2, but the average wind speed is 2 m. When the average rotational speed of the vertical spindle 5 at / s is detected or the peripheral speed of the rotor 2 when the average wind speed is 2 m / s is detected, the power regeneration type motor 3 is switched to the motor mode, The rotor 2 may be accelerated.

In the above embodiment, the motor mode is accelerated until the peripheral speed of the rotor 2 reaches 5 m / s and the motor mode is switched to the generator mode. However, as described above, the peripheral speed of the rotor 2 is Since the rotational speed can be converted, the motor mode can be switched to the generator mode when the rotational speed sensor 20 detects the rotational speed of the rotor 2 when the peripheral speed reaches 5 m / s.

In the above embodiment, the power regeneration type motor 3 is switched to the motor mode, and the average wind speed for accelerating and rotating the rotor 2 is 2 m / s. The average wind speed at this time corresponds to the rotation radius of the blade 8. Is set appropriately.
That is, for example, when the rotational radius of the blade 8 is smaller than 1 m in the above embodiment, the rotational torque of the rotor 2 becomes small, and it is easy to stall due to the power generation load. Therefore, the average wind speed is set to 2 m / s or more. Thus, when the rotational speed of the rotor 2 is high, the rotor 2 may be accelerated and switched to the motor mode.

Further, when the rotation radius of the blade 8 is larger than 1 m, even if the rotation speed of the rotor 2 is low, the rotation torque becomes large and power can be generated. Therefore, the average wind speed is set to 2 m / s or less, and the rotor When the rotational speed of 2 is low, the rotor 2 may be accelerated and switched to the motor mode.

In the above embodiment, when the peripheral speed of the rotor 2 reaches 5 m / s, the power regeneration motor 3 is switched from the motor mode to the generator mode. However, when the motor mode is switched to the generator mode. The peripheral speed of the rotor 2 is appropriately set according to the rotation radius of the blade 8.

In the above embodiment, the second storage battery 13 stored by the solar power generation panel 12 is used as the power source operated in the motor mode. However, the solar power generation panel 12 and the second storage battery 13 are omitted, and the first storage battery is used. The electric power of 11 may be used to operate the motor. At this time, as described above, since the operation time in the motor mode is short, the power consumption of the first storage battery 11 can be minimized.

As described in FIG. 4 of Japanese Patent No. 4907073, the present invention relates to a wind power generator in which lift type blades are fixed to a vertical main shaft in a multistage shape, or Japanese Patent No. 4740580, that is, the tip of the blade is in the main shaft direction. The present invention can also be applied to a wind turbine generator having a horizontal axis wind turbine inclined in the (wind receiving direction).

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 Rotor 3 Electric power regeneration type motor 4 Control means 5 Vertical main shaft 6 Support frame 6A Bearing 7A, 7B Arm 8 Lift type blade 8A Main part 8B Inward inclined part 9 Switching circuit (switching means)
DESCRIPTION OF SYMBOLS 10 Controller 11 1st storage battery 12 Solar power generation panel 13 2nd storage battery 14 Average wind speed determination part 15 Windmill peripheral speed determination part 16 Generator / motor switching determination part 17 Anemometer (wind speed detection means)
18 Central processing unit 19 Gear 20 Rotation speed detection sensor C Blade thickness center line G Foundation O Rotation locus

Claims

A windmill having a rotor with a plurality of blades;
A power regeneration type motor connected to the main shaft of the rotor and switchable between a generator mode and a motor mode;
Rotation speed detection means for detecting the circumferential speed or rotation speed of the rotor;
Wind speed detection means for detecting an average wind speed toward the rotor;
Switching means capable of selectively switching the power regeneration type motor to either a generator mode or a motor mode;
Control means for controlling the rotational speed of the windmill,
When the wind speed detecting means detects a predetermined average wind speed, the control means switches the electric power regeneration type motor to a motor mode, and the rotational speed detecting means allows the circumferential speed or rotational speed of the rotor. Until the rotor reaches a specific value, the rotor is accelerated to rotate, and the switching means controls the power regeneration type motor to switch to the generator mode to generate power, and the wind speed detecting means. When the predetermined average wind speed is detected again, the switching means switches the power regeneration type motor to the motor mode again, and accelerates rotation until the circumferential speed or rotational speed of the rotor reaches a specific value, The wind power generator is characterized in that the switching means is repeatedly controlled so that the electric power regeneration type motor is switched to the generator mode to generate power again.
2. The wind turbine generator according to claim 1, wherein the wind turbine is a vertical axis wind turbine or a horizontal axis wind turbine including a rotor having a plurality of lift-type blades each having an inclined portion formed at a tip portion.
The wind power generator according to claim 1 or 2, wherein power generated by a photovoltaic power generation panel is used as a power source for operating the electric power regeneration type motor by switching to a motor mode.