JP4774843B2 - Wind power generation equipment - Google Patents

Description

  The present invention relates to a wind power generation facility.

Patent Document 1 discloses a protection device for a wind power generation system that aims to accurately detect the rotational speed of a windmill. In this protective device, the wind turbine and the like can be appropriately selected by accurately detecting the rotational speed of the wind turbine and the AC generator (hereinafter also simply referred to as “wind turbine etc.”) regardless of the load on the wind power generation system. It is configured to reduce the rotation speed and prevent the windmill and the like from being damaged. Therefore, this protection device includes a frequency detector that detects the output frequency of the AC generator. Thereby, the rotational speed of the windmill or the like is accurately detected, and when the detected output frequency (rotational speed) exceeds a certain value (upper limit value), the short-circuit device is activated, and the rotational speed of the windmill or the like is decelerated or stopped. Has been.
Patent Document 2 aims to prevent permanent magnets in the rotor of the AC generator from demagnetizing even if the output terminal (including the armature circuit, the same applies hereinafter) of the AC generator is short-circuited. A short circuit device is disclosed. In the configuration in which the output terminal is simply short-circuited as in the conventional short-circuit device, there is a problem that an excessive current flows from the armature circuit to the armature coil, and the permanent magnet of the rotor is demagnetized. Therefore, in the short circuit device of Patent Document 2, an output terminal is short-circuited through an impedance composed of a capacitor, a resistor, a reactor, and the like, thereby preventing an excessive current from flowing from the armature circuit to the armature coil. Thus, the permanent magnet in the rotor can be prevented from demagnetizing.
JP 2000-199473 (Claim 1, effect related to 0006) Japanese Patent Laid-Open No. 2002-339856 (Claim 2, Effect on 0033, FIG. 2)

However, when the wind power generation facility is operating by the maximum power tracking control, the rotational speed of the windmill cannot always be reduced by operating the short-circuit device described above. The reason will be described below.
Here, the maximum power follow-up control refers to a control method in which the load applied to the windmill or the like is appropriately increased or decreased so that the specific rotation speed at which the output power at a certain wind speed is maximized.
FIG. 6 shows torque generated when the wind turbine receives wind (hereinafter also simply referred to as “wind turbine generated torque”) and torque that is generated by short-circuiting the output terminal of the generator to decelerate the wind turbine. (Hereinafter, also simply referred to as “rotational braking torque”).

  In this case, the generated torque of the wind turbine operated by the maximum power tracking control theoretically increases infinitely in proportion to the third power of the wind speed, whereas the rotational braking torque reaches the upper limit at the predetermined rotational speed of the wind turbine. Thereafter, it has the property of decreasing as the rotational speed of the windmill increases.

Accordingly, in the rotational speed region where the rotational braking torque is larger than the wind turbine generated torque, the rotation of the wind turbine can be controlled by the rotational braking torque (including deceleration and stop) (hereinafter, this speed region is simply referred to as “controllable speed region”). On the other hand, the rotation of the wind turbine cannot be controlled by the rotational braking torque in the rotational speed region where the wind turbine generated torque is larger than the rotational braking torque (hereinafter, this speed region is simply referred to as “uncontrollable”). It is also called “Available speed range”.)
Further, if the rotational speed of the windmill becomes excessive, the windmill or the like may be damaged (hereinafter, such speed is also simply referred to as “overspeed”).

However, in the configuration of Patent Document 1, an upper limit value of the rotational speed is merely provided for determining whether or not to operate the short-circuit device that decelerates the rotational speed of the windmill. On the other hand, when gusts or strong winds occur, the rotational speed and rotational acceleration of the windmill are accompanied by steep changes. As in Patent Document 1, simply setting the upper limit value of the rotation speed does not always prevent the rotation speed of the windmill from reaching the uncontrollable speed region when the wind condition changes abruptly. There is a risk of reaching overspeed. Alternatively, if the upper limit value of the rotational speed is set low in advance to prevent the rotational speed of the windmill from reaching the uncontrollable speed region, the power generation capability of the wind power generation facility cannot be fully exhibited.
On the other hand, the configuration of Patent Document 2 only prevents the permanent magnet in the rotor from demagnetizing, and how to reach the uncontrollable speed region when a gust or strong wind occurs. There is no description on whether to prevent.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  In a wind power generation facility equipped with a windmill and a generator and capable of operating by maximum power tracking control, a rotational speed detecting means for detecting the rotational speed of the windmill, and a wind for predicting a wind condition based on the rotational speed And a short-circuit means for short-circuiting the output side of the generator, and the short-circuit means is operated based on the prediction by the wind condition prediction means.

  With the above configuration, the rotation of the windmill or the like can be stopped by the rotational braking torque. In addition, since it is possible to detect at an early stage that a strong wind or gust that may damage the windmill or the like may occur, if the windmill generated torque may exceed the rotational braking torque, the rotation of the windmill or the like may be reduced. It is possible to stop in advance. Therefore, it is possible to prevent the rotational speed of the windmill or the like from reaching the excessive rotational speed, thereby preventing the wind power generation equipment from being damaged.

  The wind condition prediction means includes acceleration estimation means for estimating rotational acceleration from the rotational speed, and acceleration change rate estimation means for estimating a rotational acceleration change rate from the rotational acceleration. It is preferable to predict the situation.

  With the above configuration, the wind condition can be predicted more reliably. An estimation unit is used as a prediction unit. Therefore, the structure can be simplified.

  When the upper limit value for the rotational acceleration (hereinafter, also simply referred to as “rotational acceleration upper limit value”) is determined based on the prediction result of the wind condition predicting means, and the rotational acceleration is equal to or higher than the upper limit value, the short-circuit device It is preferable to operate.

  With the above configuration, the rotational acceleration upper limit value is individually determined according to each wind condition, so that the short-circuit device can be easily operated without excess or deficiency. Accordingly, the operating rate of the wind power generation facility is improved.

  The rotational acceleration upper limit value is determined to be larger with respect to the larger rotational acceleration change rate. That is, it is preferable to determine the rotation acceleration upper limit value according to the rotation acceleration change rate.

With the above configuration, when a gust of wind that accelerates the acceleration of the wind speed (the rate of change in rotational acceleration is large) occurs, the rotational speed of the windmill reaches the uncontrollable speed range or overspeed. It is possible to prevent the short-circuit device from operating against wind conditions that cannot be achieved. Therefore, the operating rate of the wind power generation facility can be improved.
On the other hand, in the case where a strong wind (rotational acceleration change rate is small) in which the acceleration of the wind speed takes a long time and the largest rotational acceleration that occurs is smaller than that of the gust of wind occurs, the above upper limit value is set. By determining it to be small, the short-circuit device can be suitably operated without exception for wind conditions in which the rotational speed of the windmill or the like can reach an uncontrollable speed region or an excessive rotational speed.
Therefore, damage to the windmill and the like can be prevented more reliably.

  Even when the rotational speed exceeds a certain value, it is preferable to operate the short-circuit means.

  With the above configuration, the short-circuit means can be operated when the rotation speed exceeds a predetermined rotation speed upper limit value. Therefore, the rotation speed can be more reliably prevented from reaching the over rotation speed.

  Hereinafter, embodiments of a wind power generation facility according to the present invention will be described with reference to the drawings.

  Here, an example in which the wind power generation facility according to the present invention is operating by maximum power tracking control will be described.

FIG. 1 is a block diagram of a wind power generation facility according to an embodiment of the present invention.
FIG. 2 is a diagram showing an overall configuration of a wind power generation facility according to an embodiment of the present invention.
FIG. 3 is a flowchart relating to the operation of the wind power generation facility according to the embodiment of the present invention.
FIG. 4 is a flowchart of a subroutine related to the wind condition prediction function.
FIG. 5 is a flowchart of a subroutine related to wind turbine deceleration or stop.
FIG. 6 is a diagram showing the relationship between the wind turbine generating torque and the rotational braking torque.
FIG. 7 is a diagram showing the rotational acceleration of the windmill when a gust is generated.
FIG. 8 is a diagram showing the rotational acceleration of the windmill when a strong wind is generated.

  As illustrated in FIG. 1, a wind power generation facility 100 according to an embodiment of the present invention includes a wind power generator main body 1 that converts wind energy, which is a kind of natural energy, into AC power composed of electric energy and outputs the power, and the wind power The controller 2 is connected to the power generator main body 1 and has a control function of the wind power generator main body 1 and a function of converting the AC power into DC power.

  As shown in FIG.1 and FIG.2, the wind power generator main body 1 is provided with the windmill 11 which generate | occur | produces the windmill generation torque according to a wind force. Here, since the wind power generation facility 100 is operating by maximum power tracking control, the rotational speed of the windmill 11 is determined under a certain correlation with the wind speed. Specifically, the rotational speed of the wind turbine 11 is appropriately controlled so that the power supplied by the wind power generation facility 100 becomes maximum at an arbitrary wind speed (see also FIG. 6).

  As shown in FIG. 2, a rotational speed detector 18 is provided on the rotary shaft 15 that rotatably supports the windmill 11. The rotation speed detector 18 is composed of an encoder, for example, and outputs a rotation speed signal (for example, a pulse signal) corresponding to the rotation speed of the rotating shaft 15.

  The rotary shaft 15 is provided with, for example, a three-phase AC generator 19. The generator 19 is configured to output AC power corresponding to the rotational speed of the rotary shaft 15. A short-circuit braking device 21 to be described later is connected to the output side of the generator 19.

  As shown in FIGS. 1 and 2, the controller 2 includes a control unit 31 that controls the wind power generator main body 1, a power converter 32 that converts AC power output from the generator 19 into DC power, A short-circuit braking device 21 for short-circuiting the output side of the generator 19 is provided.

  The short-circuit braking device 21 includes a short-circuit relay 22 (see FIG. 2). The short-circuit relay 22 has three relay contacts, which are connected to each output terminal of the generator 19. The switch portion of the short-circuit relay 22 is switched depending on whether or not power is supplied from a short-circuit drive unit 42 (see FIG. 1) described later. Specifically, when the energization is present, the switch unit is in an open state, and when there is no energization, the switch unit is in a closed state. When the switch portion of the short-circuit relay 22 is closed as in the latter case and the output terminals of the generator 19 are short-circuited, the generator 19 generates rotational braking torque. Therefore, for example, when the controller 2 breaks down and a necessary electric signal or the like cannot be distributed to each device, the rotation control torque is inevitably generated, so that the windmill 11 and the like can be stopped.

  As shown in FIG. 1, the control unit 31 includes a rotation speed input unit 41, a short-circuit drive unit 42, a charge control drive unit 43, and an arithmetic processing unit 51 that monitors or controls each of the units 41 to 43. ing. Note that the rotation speed input unit 41, the short-circuit driving unit 42, and the charging control driving unit 43 are all connected to the arithmetic processing unit 51. Details of the arithmetic processing unit 51 will be described later.

  The rotational speed input unit 41 is connected to the rotational speed detector 18 and has a function of converting the rotational speed signal from the rotational speed detector 18 into a signal form suitable for signal processing.

  The short-circuit drive unit 42 is connected to the short-circuit braking device 21 (short-circuit relay 22) and has a function of controlling the open / close state of the short-circuit relay 22 as described above (see also FIG. 2). . More specifically, during normal operation (power generation), the rotation of the rotating shaft 15 is allowed by energizing the short-circuit relay 22, while the rotation of the rotating shaft 15 needs to be decelerated or stopped. The relay 22 has a function of stopping energization and generating rotational braking torque.

  The arithmetic processing unit 51 includes an arithmetic unit and a storage unit (not shown), and has various functions for controlling the wind power generation facility 100 in the form of a program. Each function may be formed in a hardware form instead of the software form of the program.

The arithmetic processing unit 51 has the following functions.
That is, (1) a charge control function for controlling the charge control drive unit 43, (2) a rotation speed determination function for determining whether or not the rotation speed is normal, and (3) wind conditions such as gusts and strong winds from the rotation speed. (4) a rotational acceleration determination function for determining whether or not the rotational acceleration is normal, and (5) a windmill deceleration stop function for decelerating or stopping the rotation of the windmill 11 or the like. Note that the charge control function, the rotational speed determination function, and the wind condition prediction function all monitor the rotational speed of the rotary shaft 15 via the rotational speed input unit 41.

  The charge control function (1) gives a command to the power converter 32 via the charge control drive unit 43 when the rotation speed of the rotary shaft 15 exceeds a predetermined rotation speed upper limit value, and follows the maximum power. The load is charged by the control command.

The rotational speed determination function (2) considers that there is a risk of reaching an excessive rotational speed when the rotational speed is equal to or higher than a predetermined rotational speed upper limit value, and short-circuit braking device 21 via short-circuit drive unit 42. Is operated (short-circuited) to generate rotational braking torque to adjust the rotational speed, or to stop completely. Thereby, since the windmill 11 grade | etc., Can be decelerated or stopped quickly, damage etc. of the windmill 11 grade | etc., Can be prevented.
A specific operation will be described later, but the operation follows the flow of FIG.

The wind condition prediction function (3) includes a function of calculating (estimating) rotational acceleration from the rotational speed and a function of calculating (estimating) a rotational acceleration change rate from the rotational acceleration. Further, based on the rate of change in rotational acceleration, it provides a reference for determining whether or not to continue the operation of the wind power generation facility 100 by predicting what kind of wind has started to blow, that is, the wind condition. .
Although the specific operation will be described later, the operation follows the flow of FIGS.

The rotational acceleration determination function (4) monitors the rotational acceleration obtained by the wind condition prediction function (3). When the rotational acceleration becomes equal to or higher than the rotational acceleration upper limit value described later, the rotational speed of the rotary shaft 15 is considered to possibly reach the uncontrollable speed region, and the short-circuit braking device 21 is connected via the short-circuit driving unit 42. By operating (short-circuiting), rotational braking torque is generated. As a result, the windmill 11 or the like can be quickly stopped, so that the windmill 11 or the like does not rotate at an excessive rotation speed due to gusts or strong winds, thereby preventing the windmill 11 or the like from being damaged.
A specific operation will be described later, but the operation follows the flow of FIG.

The windmill deceleration stop function (5) monitors the determination results by the rotation speed determination function (2) and the rotation acceleration determination function (4). When an abnormal state of the wind power generation facility 100 is detected in any of the determination processes, the rotational braking torque is generated by operating (short-circuiting) the short-circuit braking device 21 via the short-circuit driving unit 42. Yes. Thereby, the windmill 11 grade | etc., Can be decelerated or stopped rapidly.
Although the specific operation will be described later, the operation follows the flow of FIGS.

  Further, as shown in FIG. 1, the power converter 32 includes an appropriate rectifier and a DC / DC converter. The electric power generated by the generator 19 is supplied to the load through the rectifier and the DC / DC converter in this order. The charge control drive unit 43 is connected to the DC / DC converter.

  With the above configuration, the wind turbine generator according to this embodiment has the following effects.

  In a wind power generation facility 100 that includes a windmill 11 and a generator 19 and can be operated by maximum power tracking control, a rotational speed detection means (rotational speed detector 18) that detects the rotational speed of the windmill 11 and the rotation Wind condition predicting means (arithmetic processing unit 51) for predicting the wind condition based on the speed, and short-circuit means (short-circuit braking device 21) for short-circuiting the output side of the generator 19, are provided by the wind condition predicting means. The short-circuit means is activated based on the prediction.

  With the above configuration, the rotation of the wind turbine 11 and the like can be stopped by the rotational braking torque. Further, it is possible to detect at an early stage that there is a possibility that strong winds or gusts that damage the windmill 11 or the like may occur. Thereby, when there is a possibility that the wind turbine generated torque may exceed the rotational braking torque, the rotation of the wind turbine 11 or the like can be stopped in advance. Therefore, it is possible to prevent the rotational speed of the windmill 11 and the like from reaching the excessive rotational speed, and thus it is possible to prevent the wind power generation equipment 100 from being damaged.

  The wind condition predicting means (arithmetic processing unit 51) includes an acceleration estimating means (calculating processing unit 51) for estimating the rotational acceleration from the rotational speed, and an acceleration change rate estimating means (calculating) for estimating the rotational acceleration change rate from the rotational acceleration. And a processing unit 51), and predicts the wind condition from the rate of change in rotational acceleration.

  With the above configuration, the wind condition can be predicted more reliably. Moreover, an estimation means (arithmetic processing unit 51) is used as a means for prediction. Therefore, the structure can be simplified.

  An upper limit value for the rotational acceleration is determined based on the prediction result of the wind condition prediction means (arithmetic processing unit 51), and the short-circuit device (short-circuit braking device 21) is activated when the rotational acceleration is equal to or greater than the upper limit value. Let

  With the above configuration, the rotational acceleration upper limit value is individually determined according to each wind condition, so that it is easy to operate the short-circuit device (short-circuit braking device 21) without excess or deficiency. Therefore, the operating rate of the wind power generation facility 100 is improved.

  The upper limit value is determined to be larger with respect to a larger rate of change in rotational acceleration. That is, the upper limit value is determined according to the rotational acceleration change rate.

With the above configuration, when a gust of wind that accelerates the acceleration of wind speed (the rate of change in rotational acceleration is large) occurs, the rotational speed of the windmill 11 or the like reaches an uncontrollable speed region or an excessive rotational speed. It can prevent that the said short circuit device (short circuit braking device 21) act | operates with respect to the wind condition which cannot do. Therefore, the operating rate of the wind power generation facility 100 can be improved.
On the other hand, in the case where a strong wind (rotational acceleration change rate is small) in which the acceleration of the wind speed takes a long time and the largest rotational acceleration that occurs is smaller than that of the gust of wind occurs, the above upper limit value is set. By setting it small, the short-circuit device (short-circuit braking device 21) can be suitably operated without exception for wind conditions in which the rotational speed of the windmill 11 or the like can reach an uncontrollable speed region or an excessive rotational speed. .
Therefore, it is possible to more reliably prevent the windmill 11 and the like from being damaged.

  Even when the rotational speed exceeds a certain value, the short-circuit means (short-circuit braking device 21) is operated.

  With the above configuration, even if the rotational acceleration is always small or the rotational acceleration change rate is small in a series of changes in the wind conditions, the short-circuit means (short-circuit braking device 21) can be obtained by exceeding the rotational speed upper limit value. Can be activated. Therefore, the rotation speed can be more reliably prevented from reaching the over rotation speed.

  Next, the operation of the wind power generation facility 100 in this embodiment will be described.

The arithmetic processing unit 51 operates as follows.
That is, (1) charging control function, (2) rotational speed determination function, (3) wind condition prediction function, (4) rotational acceleration determination function, and (5) windmill deceleration stop function described above are as follows: Perform the following process.

  The operation of the charge control function (1) is as described above.

  The rough operation of the rotational speed determination function (2) is as described above. The upper limit value of the rotational speed is preferably determined in consideration of the following three points. That is, the rotation speed upper limit value is within the controllable speed range so as to enable control, is set as large as possible to ensure the operating rate of the wind power generation facility 100, and is further controlled to allow for a certain margin. It is preferable that it is determined in consideration that it is slightly smaller than the upper limit value.

A specific operation of the rotation speed determination function (2) will be described with reference to FIG.
When the rotational speed of the rotating shaft 15 detected by the rotational speed detector 18 is less than the upper limit value of the rotational speed (S304: YES), the other processes ( (S305 and later). When that is not right (S304: NO), the rotation of the windmill 11 is adjusted or it stops completely (S400).

The general operation of the wind condition prediction function (3) is as described above, and the specific operation will be described with reference to FIGS.
When it is determined that the rotation speed of the rotation shaft 15 is less than the rotation speed upper limit value (S304: YES), the rotation acceleration (S306) and the rotation acceleration change rate (S307) are calculated based on the rotation speed as shown in FIG. Calculate. FIG. 7 shows the characteristics of the change in rotational acceleration observed in the gust of wind, and FIG. 8 shows that of the strong wind. As shown in these figures, the characteristics of the wind conditions are prominent as the initial rate of change in rotational acceleration. Therefore, it is possible to predict the wind condition early based on the rate of change in rotational acceleration (S308).
Specifically, as shown in FIG. 7, when the rotational acceleration increases sharply, that is, when the rate of change in acceleration is large, the wind condition prediction function (3) predicts that it is shifting to a gust of wind, and FIG. As shown in the figure, when the rotational acceleration tends to increase and the rate of change in acceleration is relatively small, it is predicted that the vehicle is moving to a strong wind.

The general operation of the rotational acceleration determination function (4) is as described above. The specific operation will be described with reference to FIGS. 3, 7, and 8. FIG.
Based on the prediction result of the wind condition prediction function (3), the rotational acceleration upper limit value is set (S310, FIG. 7 and FIG. 8). When the rotational acceleration is equal to or greater than the rotational acceleration upper limit value (S311: NO), the rotation of the windmill 11 is stopped (S400). If not (S311: YES), the rotation of the windmill 11 is continued or started (S350).

Here, a method of determining the rotational acceleration upper limit value will be described.
For example, when it is predicted that the wind condition prediction function (3) is shifting to a gust, the rotation acceleration upper limit value is set large. On the other hand, when it is predicted that the wind is shifting to a strong wind, the rotational acceleration upper limit value is set small.
For example, when a gust of wind occurs (FIG. 7), the rotational acceleration of the windmill 11 is generally greatly increased, but it often converges in a short time, and the windmill 11 does not eventually reach the uncontrollable speed region. There are many cases. Therefore, if the rotational acceleration upper limit value is made small, the windmill 11 is decelerated and stopped even when the uncontrollable speed region cannot be reached, thereby unnecessarily reducing the operating rate of the wind power generation equipment 100. Become. Therefore, when it is predicted that the wind condition is shifting to a gust, the rotation acceleration upper limit value is set large.
On the other hand, when strong winds occur (Fig. 8), generally the increase in the rotational acceleration of the windmill is moderate, but the acceleration often continues for a long time, and the peak of the acceleration is compared with that of the gust. small. Accordingly, if the rotational acceleration upper limit value is increased, the wind turbine speed may reach the uncontrollable speed region while the rotational acceleration does not reach the upper limit value, and the wind turbine 11 and the like may be damaged. Therefore, when it is predicted that the wind condition is shifting to a strong wind, the rotational acceleration upper limit value is set small.

The general operation of the windmill deceleration stop function (5) is as described above. The specific operation will be described with reference to FIGS.
When an abnormal state of the wind power generation facility 100 is detected in S304 or S311 shown in FIG. 3 (S304: NO or S311: NO), the windmill 11 is decelerated or stopped (S400). Specifically, as shown in FIG. 5, the short-circuit drive unit 42 is turned OFF (short-circuit relay 22: short-circuit state, S402).
Here, when it is necessary to completely stop the windmill 11, it is preferable to provide a timer (S402a) between S402 and S403 so that the process is interrupted for a predetermined time. The timer may be set to monitor the rotational speed of the rotary shaft 15 and confirm that it has completely stopped, and then proceed to S403, or continue to be suspended until an instruction is given to resume processing. You may do it.

  Although the present invention has been described in the preferred embodiments above, the present invention is not so limited. It will be understood that various other embodiments may be made without departing from the spirit of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

That is, although a shorting relay is used as a means for short-circuiting the output side of the generator, it may be short-circuited using a semiconductor switch or the like. Furthermore, the short-circuit relay of the short-circuit braking device has three relay contacts and is connected to each of the three-phase AC terminals of the generator, but the two terminals of the generator 19 are connected to the relay contacts. You may make it short-circuit through. In this case, two relay contacts are required.

  In addition, the program for realizing each function in the present embodiment may be written in a read-only manner in the ROM of the storage unit in advance, or a program recorded on a recording medium such as a CD may be read out when necessary and stored in the storage unit. Or may be transmitted via a telecommunication line such as the Internet and written to the storage unit.

The block diagram of the wind power generation equipment which concerns on one Embodiment of this invention. The figure which shows the whole structure of the wind power generation equipment which concerns on one Embodiment of this invention. The flowchart regarding the action | operation of the wind power generation equipment which concerns on one Embodiment of this invention. The flowchart of the subroutine regarding a wind condition prediction function. The flowchart of the subroutine regarding a windmill deceleration or a stop. The figure which shows the relationship between a windmill generating torque and rotational braking torque. The figure which shows the rotational acceleration of the windmill at the time of gust generation. The figure which shows the rotational acceleration of the windmill at the time of a strong wind generation | occurrence | production.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Windmill 19 Generator 21 Short-circuit braking device 51 Operation processing part (wind condition prediction means etc.)
100 Wind power generation facilities

Claims (4)

In a wind power generation facility equipped with a windmill and a generator and capable of operating by maximum power tracking control,
Rotation speed detection means for detecting the rotation speed of the windmill;
A wind condition prediction means for predicting a wind condition based on the rotation speed;
Short-circuit means for short-circuiting the output side of the generator;
Have
The wind condition prediction means is
Acceleration estimating means for estimating rotational acceleration from the rotational speed;
An acceleration change rate estimating means for estimating a rotation acceleration change rate from the rotational acceleration,
The wind condition is predicted from the rate of change in rotational acceleration,
The wind power generation facility characterized in that the short-circuit means is operated based on the prediction by the wind condition prediction means. Set an upper limit value for the rotational acceleration based on a prediction result of the wind situation predicting means, according to claim 1, wherein the rotational acceleration actuates said shorting means is equal to or greater than the upper limit value, it is characterized by Wind power generation equipment. The wind power generation facility according to claim 2 , wherein the upper limit value is set to be larger with respect to the larger rate of change in rotational acceleration. The wind power generation facility according to any one of claims 1 to 3 , wherein the short-circuit means is operated even when the rotation speed exceeds a certain value.

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