CN112983751A

CN112983751A - Wind generating set

Info

Publication number: CN112983751A
Application number: CN201911296068.8A
Authority: CN
Inventors: 拜亮; 刘飞; 许可歆; 贾乐; 刘岩
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Xinjiang Goldwind Science and Technology Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2021-06-18

Abstract

The invention discloses a wind generating set, which comprises a tower, a cabin and blades arranged at the front end of the cabin, wherein the tower is arranged on the front end of the cabin; the device also comprises a controller and a monitoring component, wherein the controller is in signal connection with the monitoring component; the blade is provided with an identification part, the wall of the tower drum is provided with a monitoring position, and the monitoring part is used for monitoring the real-time position of the rotation track of the identification part of the blade at the monitoring position; the controller is used for sending a tower sweeping risk prompt when the real-time position of the rotation track of the identification part of the blade at the monitoring position reaches the tower sweeping critical position of the identification part at the monitoring position. According to the wind generating set provided by the invention, the monitoring part can monitor the real-time position of the motion trail of the blade identification part at the monitoring position, if the real-time position reaches the tower-sweeping critical position, a tower-sweeping risk prompt can be output outwards, and the tower-sweeping collision accident between the blade and the tower can be avoided to a greater extent.

Description

Wind generating set

Technical Field

The invention relates to the technical field of wind power generation, in particular to a wind generating set.

Background

Wind generating set includes impeller, generator, cabin and tower section of thick bamboo, and the impeller includes blade and wheel hub, and in order to catch wind energy more, at present, the length of blade is all longer on the market, receives the wind load effect at the during operation, and the blade takes place to warp towards the tower section of thick bamboo easily, and this just can lead to blade and tower section of thick bamboo to take place to sweep the tower collision, and then causes serious incident.

Therefore, how to monitor the risk of sweeping the tower so as to take measures in time to avoid the blade from colliding with the tower barrel in the rotating process as much as possible still remains a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a wind generating set, which can monitor the tower sweeping risk of a blade.

In order to solve the technical problem, the invention provides a wind generating set, which comprises a tower cylinder, a cabin and blades arranged on the cabin, wherein the tower cylinder is arranged on the tower cylinder; the device also comprises a controller and a monitoring component, wherein the controller is in signal connection with the monitoring component; the blade is provided with an identification part, the wall of the tower drum is provided with a monitoring position, and the monitoring part is used for monitoring the real-time position of the rotation track of the identification part of the blade at the monitoring position; the controller is used for sending a tower sweeping risk prompt when the real-time position of the rotation track of the identification part of the blade at the monitoring position reaches the tower sweeping critical position of the identification part at the monitoring position.

According to the wind generating set, the monitoring component can monitor the real-time position of the motion track of the blade identification position at the monitoring position, the controller can compare the real-time position with the tower sweeping critical position at the monitoring position, if the real-time position reaches the tower sweeping critical position, a tower sweeping risk prompt can be output outwards, so that corresponding operation can be taken for the wind generating set in time, and further the tower sweeping collision accident between the blade and the tower can be avoided to a large extent.

Optionally, the monitoring position is a monitoring hole formed in the wall of the tower barrel, the monitoring hole is a strip-shaped hole extending in the vertical direction, and the monitoring part is arranged in the tower barrel and monitors the real-time position of the rotation track of the identification part of the blade in the monitoring hole through the monitoring hole.

Optionally, the real-time position and the tower-sweeping critical position are height information of a rotation track of the identification part at the monitoring position; and/or the real-time position and the tower-sweeping critical position are image information of the rotation track of the identification part at the monitoring position.

The invention also provides another wind generating set which comprises a tower, a cabin and blades arranged on the cabin; the device also comprises a controller and a monitoring component, wherein the controller is in signal connection with the monitoring component; the blade is provided with an identification part, a monitoring part is arranged outside the cylinder wall of the tower barrel and/or the tower barrel, the monitoring part is used for monitoring whether the identification part of the blade reaches a tower sweeping critical position of the identification part at the monitoring part in the rotation process, and the controller is used for sending a tower sweeping risk prompt when the identification part of the blade reaches the tower sweeping critical position of the identification part at the monitoring part in the rotation process.

This wind generating set, its monitoring part can monitor whether blade identification position reaches the critical position of sweeping the tower of identification position at the monitoring position at the rotation in-process, if reach and sweep the critical position of tower, can outwards export and sweep the tower risk suggestion to take corresponding operation in time to wind generating set, and then can avoid the tower that sweeps between blade and the tower section of thick bamboo to a great extent and collide the accident.

Optionally, the monitoring position is a monitoring hole formed in the wall of the tower drum, the monitoring part is arranged in the tower drum, and whether the identification part reaches a tower sweeping critical position of the identification part at the monitoring position in the rotation process is monitored through the monitoring hole.

Optionally, the monitoring part is provided with a plurality of monitoring heads, each monitoring head is distributed at intervals along the vertical direction, and each monitoring head is used for monitoring whether the identification part reaches the critical position of the tower cleaning in the rotation process.

Optionally, each monitoring hole includes a plurality of monitoring small holes arranged at intervals in the vertical direction, and each monitoring small hole of the same monitoring hole is arranged in one-to-one correspondence with each monitoring head of the corresponding monitoring component.

Optionally, the number of the monitoring holes is more than two, the monitoring holes are distributed at intervals along the circumferential direction, and the monitoring component can monitor the blade through the monitoring holes.

Optionally, when the blade rotates to be aligned with the tower drum, one monitoring hole of the tower drum is aligned with the blade, and the monitoring hole is a main monitoring hole; or, when the blade rotates to be aligned with the tower drum, the blade is located between two adjacent monitoring holes, and the monitoring holes which are relatively close to the blade along the circumferential direction are main monitoring holes.

Optionally, the number of the monitoring parts is only one, the monitoring parts are mounted on a rotating mechanism, and the rotating mechanism can drive the monitoring parts to rotate, so that the monitoring parts are opposite to the main monitoring hole.

Optionally, a support member is further disposed in the tower, and the monitoring member is mounted to the support member.

Optionally, the identification location is a tip of the blade; the number of the tower sweeping critical positions is multiple, and multiple stages of tower sweeping risk prompts exist correspondingly.

Drawings

FIG. 1 is a schematic view of blades gradually moving toward a tower under the action of wind load during the operation of a wind generating set;

FIG. 2 is a diagram illustrating a connection structure between a tower and a monitoring component in a wind turbine generator system according to an embodiment of the present invention;

FIG. 3 is a partial view of FIG. 2;

FIG. 4 is a schematic structural view of an alternative to FIG. 3;

FIG. 5 is a diagram of the relative positions of the rotation trajectory of the marked part of the blade and the monitoring hole under the conventional working condition;

FIG. 6 is a diagram of the relative positions of the monitoring holes and the rotation path of the identified portion of the blade under the yawing condition.

The reference numerals in fig. 1-6 are illustrated as follows:

1, a tower barrel, 11 monitoring holes, 12 supporting parts and 13 barrier strips;

2, marking the part by a blade and 21;

3 monitoring means, 31 monitoring the head.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As used herein, the term "plurality" refers to an indefinite plurality, typically two or more; and when the term "plurality" is used to indicate a quantity of a particular element, it does not indicate a quantitative relationship between such elements.

Referring to fig. 1-6, fig. 1 is a schematic view illustrating a blade gradually moving toward a tower under a wind load during operation of a wind turbine generator system, fig. 2 is a connection structure diagram of the tower and a monitoring component in the wind turbine generator system according to an embodiment of the present invention, fig. 3 is a partial view of fig. 2, fig. 4 is a schematic structural view of an alternative of fig. 3, fig. 5 is a diagram illustrating a relative position between a rotation trajectory of an identified portion of the blade and a monitoring hole under a conventional condition, and fig. 6 is a diagram illustrating a relative position between the rotation trajectory of the identified portion of the blade and the monitoring hole under a yaw condition.

In order to capture wind energy better, in the using process of the wind generating set, each blade 2 is arranged facing the wind and is subjected to wind load, the blades 2 gradually deform towards the tower barrel 1 in the rotating process, and when the deformation exceeds a certain limit, the blades 2 can collide with the tower barrel 1, so that a tower sweeping accident is generated.

In order to avoid the occurrence of the tower-sweeping accident as much as possible, the embodiment of the invention provides a wind generating set, which can monitor the rotation of the identification part 21 of the blade 2, judge that the tower-sweeping risk exists once the identification part 21 reaches the tower-sweeping critical position, output a risk prompt, and then execute the operations of stopping the wind generating set or reducing the power.

The specific position of the critical position of the tower sweep may be set according to actual conditions, and in an exemplary scheme of the embodiment of the present invention, with reference to fig. 1, a state in which the blade 2 is bent toward the tower 1 by a wind load and the identification portion 21 of the blade 2 is at the lowest position is referred to as a critical state of the tower sweep, where the lowest position is a position of the identification portion 21 when the distance between the identification portion 21 and the installation plane of the tower 1 is the minimum, and the installation plane of the tower 1 is usually the ground. Accordingly, in this state, the rotation trajectory of the identification portion 21 of the blade 2 is referred to as a sweep critical trajectory, and the position of the sweep critical trajectory corresponding to each monitoring position (the wall of the tower 1 or the outside of the tower 1, which will be described later in detail) is the sweep critical position. With reference to fig. 5 and 6, taking the monitoring holes 11 as long strips arranged in the wall of the tower 1 as examples, the critical position of the sweeping tower at each monitoring hole 11 is the position where the critical track of the sweeping tower intersects with each monitoring hole 11.

It should be noted that the above-mentioned sweep tower critical position may actually include a plurality of positions, accordingly, the controller may send out a multi-stage sweep tower risk prompt, and the sweep tower critical position corresponding to each stage of sweep tower risk prompt may be set according to an actual situation; and under the indication of the risk of the tower-sweeping at different levels, the control commands sent out by the controller may also differ, for example, when the indication of the risk of the tower-sweeping is of a lower level, that is, when the probability of the tower-sweeping is lower, the operation of reducing power may be performed, and when the indication of the risk of the tower-sweeping is of a higher level, that is, when the probability of the tower-sweeping is higher, the operation of stopping the machine may be performed.

The above-mentioned mark portion 21 may be a portion having a special mark, which is disposed on the blade 2, and the special mark may be a color mark, a symbol mark, or a position mark, wherein the color mark may adopt a relatively striking color such as red, green, or blue, the symbol mark may be a symbol such as a fork, a pentagram, or the like, and the position mark may be a portion of the blade 2, such as a bent portion, an end portion, or the like, which is easy to identify. In an exemplary scheme, the tail end (end far away from the nacelle) of the blade 2 can be directly selected as the identification portion 21 to simplify the product design, and compared with other positions of the blade 2, the tail end of the blade 2 has a higher tower sweeping risk, so that the position is directly monitored, and whether the tower sweeping risk exists or not can be more conveniently and accurately judged.

Further, still taking fig. 1 as a perspective view, in the process of changing the blade 2 from the initial state to the tower-sweeping critical state, the blade tip as the identification portion 21 has a great change in height from the installation plane of the tower 1 and a position image thereof presented at the monitoring position, and based on this, whether there is a tower-sweeping risk can be determined by monitoring the height or the position image of the identification portion 21.

Specifically, the structure of the wind turbine generator system provided by the present invention will be described below in two embodiments.

Example one

With reference to fig. 1, the present embodiment provides a wind generating set, which may be a direct-drive permanent magnet wind generating set or a double-fed wind generating set, and the following description will take the direct-drive permanent magnet wind generating set as an example. The wind power generation device comprises blades, a hub, a generator, a base, a cabin and a tower barrel 1. The blades are mounted on the hub, and the blades and the hub form an impeller. The nacelle is arranged on the tower 1 and supported by the tower 1. The wind generating set comprises a cabin, a base, a shaft system, a stator and a rotor, wherein the base is usually arranged in the cabin and connected with the shaft system of the wind generating set, the shaft system comprises a rotating shaft and a fixed shaft, the fixed shaft is fixedly connected with the base, a bearing is arranged between the rotating shaft and the fixed shaft, the rotating shaft can rotate relative to the fixed shaft through the bearing, the stator of the generator is fixedly connected with the fixed shaft, the rotor of the generator is fixedly connected with the rotating shaft, the rotating shaft is fixedly connected with a hub. The device further comprises a controller (not shown in the figure) and a monitoring part 3, wherein the controller is in signal connection with the monitoring part 3, the monitoring part 3 is used for monitoring the real-time position of the rotation track of the identification part 21 of the blade 2 at the monitoring position, and the controller can send a tower sweeping risk prompt when the rotation track of the identification part 21 of the blade 2 reaches the tower sweeping critical position of the identification part 21 at the monitoring position at the real-time position of the monitoring position.

The real-time position and the sweeping tower critical position can be height information, namely when the monitoring part 3 arranged at the monitoring position monitors the identification part 21 of the blade 2, the real-time position of the identification part 21 can be converted into the real-time height, then the real-time height is compared with the pre-stored sweeping tower critical height by the controller, and if the real-time height is equal to the sweeping tower critical height, a sweeping tower risk prompt can be output outwards by the controller. In an alternative embodiment, the difference between the real-time height and the tower-sweeping critical height can be converted into the amplitude of the power reduction executed by the wind generating set.

It should be noted that the above-mentioned sweep tower critical height may be a definite value, or may be a range value, and may be specifically determined according to actual use requirements.

And/or, the real-time position and the tower-sweeping critical position may also be image position information, and the controller may pre-store a tower-sweeping critical image of the identification portion 21 at the tower-sweeping critical position of the monitoring position, and then may determine whether there is a tower-sweeping risk by comparing the real-time image and the tower-sweeping critical image.

In a specific scheme, the monitoring position may be a monitoring hole 11 formed in a wall of the tower 1, and the monitoring component 3 may be disposed in the tower 1, and monitor a real-time position of the identification portion 21 of the blade 2 through the monitoring hole 11. By adopting the structure, the monitoring component 3 is not easily subjected to external interference such as wind, rain and the like, and the monitoring accuracy can be higher.

Further, can also set up transparent material's such as glass, PVC shutoff piece in monitoring hole 11 department, this one side can prevent better that external wind and rain etc. from getting into tower section of thick bamboo 1 through monitoring hole 11 in, on the other hand, can not cause the influence to monitoring component 3's normal work yet.

Of course, the monitoring component 3 may also be disposed outside the tower 1, for example, a monitoring position may be selected outside the tower 1, and then a fixing bracket may be disposed at a position corresponding to the monitoring position, and the monitoring component 3 may be fixedly mounted on the fixing bracket, which is also an option in practical applications, and at this time, the monitoring hole 11 does not need to be disposed on the wall of the tower 1.

For example, the monitoring member 3 is disposed in the tower barrel 1, the monitoring holes 11 may be strip-shaped holes extending in the vertical direction, so as to ensure that the identification portions 21 of the blades 2 in different states can be present in the monitoring holes 11, and further, the monitoring member 3 can be monitored. The monitoring component 3 may include a bracket 32 and a monitoring head 31 mounted on the bracket 32, the monitoring head 31 may specifically be an imaging device such as a camera, and the monitoring range may be determined according to actual conditions.

The number of the monitoring holes 11 can be one or more than two, and when the number is more than two, the monitoring holes 11 can be distributed at intervals along the circumferential direction, and the monitoring part 3 can monitor the real-time positions of the identification parts 21 of the blades 2 through the monitoring holes 11 so as to adapt to the monitoring of the blades 2 under the yaw working condition.

It can be known that when each blade 2 of the wind generating set faces the wind in the front, the capturing efficiency of wind energy is higher, so that the initial position of the engine room can be adjusted according to the local wind direction and the like at the beginning of the installation of the wind generating set, so that each blade 2 can face the wind in the front, and the working condition can be called as an initial working condition or a conventional working condition; however, during actual operation, the wind direction may change, and the position of the nacelle needs to be adjusted again so that each blade 2 still faces the wind, and at this time, the position of the nacelle is shifted from the initial position, which is also called a yaw condition.

The aforesaid sets up monitoring hole 11 into a plurality of schemes for under the operating mode of yawing, also there is monitoring hole 11 to make monitoring part 3 can monitor the real-time position of blade 2, more can adapt to the monitoring of each blade 2 under the different operating modes in the actual motion process.

The monitoring component 3 can be monitored through each monitoring hole 11, or one monitoring component 3 can be correspondingly arranged at each monitoring hole 11, as shown in fig. 2, at this time, each monitoring component 3 is responsible for monitoring at one monitoring hole 11; alternatively, a plurality of monitoring heads 31 may be provided on one monitoring member 3, and each monitoring hole 11 may correspond to at least one monitoring head 31, so that each monitoring hole 11 is monitored by different monitoring heads 31.

Due to the existence of the yaw condition, during the actual operation, the following two situations may exist:

1) as shown in fig. 5, when the blade 2 rotates to be aligned with the tower 1, that is, when one blade 2 rotates to be in a vertical state, the tower 1 also has exactly one monitoring hole 11 capable of being aligned with the identification portion 21 of the blade 2, and at this time, the lowest point of the rotation track of the identification portion 21 can be monitored by the monitoring hole 11. Compared with the situation that the identification part 21 rotates to be opposite to other monitoring holes 11, when the identification part 21 is opposite to the monitoring holes 11, the distance between the identification part 21 and the monitoring holes 11 is the minimum, and the monitoring result is more accurate, so that the monitoring holes 11 can be used as main monitoring holes, and in specific practice, the real-time position of the identification part 21 can be monitored only through the main monitoring holes.

2) As shown in fig. 6, when the blade 2 rotates to the positive time of the tower 1, the blade 2 can be between two adjacent monitoring holes 11, at this moment, two monitoring holes 11 can not monitor the lowest point of the rotation track of the identification portion 21, the monitoring hole relatively closer to the blade 2 in the circumferential direction can be selected as a main monitoring hole, compared with other monitoring holes 11, the main monitoring hole is still the monitoring hole with the minimum distance between the identification portion 21 and the monitoring hole 11 when the identification portion 21 and the monitoring hole 11 are positive time, which is more favorable for ensuring the monitoring accuracy.

For both cases, a primary monitoring hole can be identified and then the real-time location of the identification portion 21 can be monitored only through the primary monitoring hole. Of course, when the main monitoring hole is adopted for monitoring, the monitoring holes 11 capable of monitoring the identification part 21 of the blade 2 can be used for monitoring synchronously, so that more monitoring positions can be obtained, and the situation of error monitoring caused when a certain monitoring part 3 goes wrong can be avoided.

When a plurality of monitoring holes 11 exist for monitoring, different weights can be configured for monitoring results of different monitoring holes 11, and then comprehensive judgment is carried out according to the monitoring results of all the monitoring holes 11; or, the priority of the monitoring results of each monitoring hole 11 may be consistent, and at this time, as long as the real-time position of the identification portion 21 of the blade 2 monitored by any monitoring hole 11 reaches the tower-sweeping critical position of the corresponding monitoring hole 11, the determination that there is a tower-sweeping risk can be made.

In fact, when the risk judgment of the tower sweeping is performed, the real-time position reaching the critical position of the tower sweeping can be continuously monitored for multiple times (more than two times) through the same monitoring hole 11 to judge so as to avoid the situation of error monitoring.

Further, a support member 12 may be disposed within the tower 1, and each of the monitoring members 3 may be mounted to the support member 12. The number of the supporting members 12 may be one, as shown in fig. 3 and 4, the supporting members 12 may be supporting plates whose outer edges are connected to the inner wall of the tower 1, and each monitoring member 3 may be mounted on the supporting plates; alternatively, a plurality of the support members 12 may be provided, and in this case, the monitoring members 3 and the support members 12 may be in a one-to-one correspondence relationship, or of course, may be in a many-to-one relationship.

In the above solutions, the position of the monitoring component 3 is determined, and in fact, the position of the monitoring component 3 may also be adjustable, and at this time, no matter what kind of working condition is, the monitoring component 3 may be adjusted and rotated to be opposite to the blade 2 opposite to the tower 1.

In detail, taking the existence of the plurality of monitoring holes 11 as an example, the number of the monitoring components 3 may be only one, the monitoring components 3 may be installed on the rotating mechanism, the rotating mechanism may include a rotating driving device and a rotating platform in the form of a motor and the like, the monitoring components 3 may be installed on the rotating platform, and the rotating driving device may drive the rotating platform to rotate, so that the monitoring components 3 may be directly opposite to the main monitoring holes.

Example two

The difference between the first embodiment and the second embodiment is that the monitoring component 3 can directly monitor whether the identification part 21 reaches the tower-sweeping critical position at the monitoring position, so that the process of judgment can be omitted, and the existence of the tower-sweeping risk can be determined as long as the identification part 21 is monitored to appear at the tower-sweeping critical position, and the monitoring is more direct.

In detail, the monitoring part 3 is used for monitoring whether the identification part 21 of the blade 2 reaches a tower-sweeping critical position of a monitoring position in the rotating process, and if the identification part reaches the tower-sweeping critical position, the controller can send a tower-sweeping risk prompt.

The monitoring hole 11 that the monitoring position still can be for setting up at the section of thick bamboo wall of a tower section of thick bamboo 1, and this monitoring hole 11 can be the round hole to directly correspond the critical position of scavenging tower, so, as long as the identification part 21 of blade 2 appears in this monitoring hole 11, can be as the judgement basis that the scavenging tower risk appears.

Of course, the monitoring hole 11 may also be a strip-shaped hole, at this time, the monitoring component 3 may be provided with a plurality of monitoring heads 31, and each monitoring head 31 may be distributed at intervals in the up-down direction, and among these cameras, one monitoring head may be used for monitoring that the identification portion 21 reaches the critical position of the tower cleaning, for example, the monitoring head 31 at the bottom in fig. 5 and the second monitoring head 31 from bottom to top in fig. 6, as long as the two monitoring heads 31 monitor the identification portion 21, it may be determined that there is a risk of the tower cleaning, and the other monitoring heads 31 may be used for monitoring the real-time position of the identification portion 21.

Based on the scheme that a plurality of monitoring heads 31 exist in a monitoring part 3, a barrier 13 can be arranged on the monitoring hole 11, the inner wall of the tower barrel 1 can be arranged on the barrier 13, the outer wall of the tower barrel 1 can also be arranged on the monitoring hole 11, so that the monitoring hole 11 is divided into a plurality of monitoring holes with the same number as the monitoring heads 31, and each monitoring hole can correspond to the monitoring heads 31 one by one. Or, a plurality of monitoring holes 11 arranged at intervals in the vertical direction may be directly formed in the wall of the tower 1, and thus, the monitoring holes may correspond to the monitoring heads 31 one by one.

In an alternative embodiment, when a plurality of monitoring heads exist, each monitoring head is always kept in an operating state, but only one monitoring head is in effect, and the effective monitoring head is determined by the yaw angle of the wind generating set.

Other parts of this embodiment are the same as those of the first embodiment, and will not be described repeatedly.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A wind generating set comprises a tower (1) and blades (2), and is characterized by further comprising a controller and a monitoring component (3), wherein the controller is in signal connection with the monitoring component (3);

the blade (2) is provided with an identification part (21), the cylinder wall of the tower cylinder (1) is provided with a monitoring position, and the monitoring part (3) is used for monitoring the real-time position of the rotation track of the identification part (21) of the blade (2) at the monitoring position;

the controller is used for sending a tower sweeping risk prompt when the rotating track of the identification part (21) of the blade (2) reaches the tower sweeping critical position of the identification part (21) at the monitoring position at the real-time position of the monitoring position.

2. The wind generating set according to claim 1, characterized in that the monitoring position is a monitoring hole (11) arranged in the wall of the tower (1), the monitoring part (3) is arranged in the tower (1), and the real-time position of the rotation track of the identification part (21) of the blade (2) in the monitoring hole (11) is monitored through the monitoring hole (11).

3. Wind park according to claim 1, wherein the real-time position, the critical position for tower clearance is height information of the rotation trajectory of the identification portion (21) at the monitoring position; and/or the presence of a gas in the gas,

the real-time position and the tower-sweeping critical position are image information of the rotation track of the identification part (21) at the monitoring position.

4. A wind generating set comprises a tower (1) and blades (2), and is characterized by further comprising a controller and a monitoring component (3), wherein the controller is in signal connection with the monitoring component (3);

the blade (2) is provided with an identification part (21), the wall of the tower drum (1) is provided with a monitoring position, and the monitoring part (3) is used for monitoring whether the identification part (21) of the blade (2) reaches a tower sweeping critical position of the identification part (21) at the monitoring position in the rotation process;

the controller is used for sending a tower-sweeping risk prompt when the identification part (21) of the blade (2) reaches a tower-sweeping critical position of the identification part at the monitoring position in the rotation process.

5. The wind power generation unit according to claim 4, wherein the monitoring position is a monitoring hole (11) formed in the wall of the tower (1), the monitoring part (3) is arranged in the tower (1), and whether the identification part (21) reaches a tower sweeping critical position of the identification part (21) at the monitoring position in the rotation process is monitored through the monitoring hole (11).

6. Wind park according to claim 5, wherein the monitoring member (3) comprises a bracket (32) and a plurality of monitoring heads (31) mounted to the bracket (32), each monitoring head (31) being spaced apart in the up-down direction, and each monitoring head (31) being adapted to monitor whether the identification portion (21) reaches the tower clearance threshold position during rotation.

7. The wind generating set according to claim 6, wherein each monitoring hole (11) comprises a plurality of monitoring holes arranged at intervals in the vertical direction, and each monitoring hole of the same monitoring hole (11) is arranged in one-to-one correspondence with each monitoring head (31) of the corresponding monitoring component (3).

8. Wind park according to any of claims 2, 5-7, wherein the number of monitoring holes (11) is two or more, each monitoring hole (11) being circumferentially spaced apart, the monitoring member (3) being capable of monitoring the blade (2) through each monitoring hole (11).

9. Wind power generation unit according to claim 8, characterized in that when the blade (2) is rotated to align with the tower (1), one of the monitoring holes (11) of the tower (1) is aligned with the blade (2), and the monitoring hole (11) is a main monitoring hole; alternatively, the first and second electrodes may be,

the blade (2) rotates to be aligned with the tower barrel (1), the blade (2) is located between two adjacent monitoring holes (11), and the monitoring holes which are relatively close to the blade (2) along the circumferential direction are main monitoring holes.

10. Wind generating set according to claim 9, characterized in that the number of monitoring members (3) is only one, and the monitoring members (3) are mounted on a rotating mechanism, and the rotating mechanism can drive the monitoring members (3) to rotate, so that the monitoring members (3) are opposite to the main monitoring hole.

11. Wind park according to any of claims 2, 5-7, wherein a support member (12) is further provided within the tower (1), the monitoring member (3) being mounted to the support member (12).

12. Wind park according to any of claims 1-7, wherein the identification location (21) is the tip of the blade (2);

the number of the tower sweeping critical positions is multiple, and multiple stages of tower sweeping risk prompts exist correspondingly.