阅读说明：本技术 叶轮锁定控制系统、控制方法及风力发电机组 (Impeller locking control system, control method and wind generating set ) 是由 宁巧珍 杨金宝 王东亚 于 2018-08-31 设计创作，主要内容包括：提供一种叶轮锁定控制系统、控制方法及风力发电机组。所述叶轮锁定控制系统包括：叶轮锁定装置,包括设置在所述定子主轴上的锁定销,以及对应地设置在所述转动轴上的锁定孔；叶轮制动装置,用于对转子轴进行制动以控制叶轮转速；位置识别装置,用于检测转动轴与预设锁定位置的相对转动距离；叶轮锁定控制装置,用于在所述位置识别装置检测到的所述相对转动距离满足预设距离范围,且在叶轮转速满足预设转速条件的情况下,控制所述叶轮制动装置进行制动并使转动轴停止在预设锁定位置,进而驱动所述锁定销插入所述锁定孔。能够提供分阶段制动方法,利用两次制动使转动轴停止在预设锁定位置。(An impeller locking control system, a control method and a wind generating set are provided. The impeller lock control system includes: the impeller locking device comprises a locking pin arranged on the stator main shaft and a locking hole correspondingly arranged on the rotating shaft; the impeller braking device is used for braking the rotor shaft to control the rotating speed of the impeller; the position recognition device is used for detecting the relative rotating distance between the rotating shaft and a preset locking position; and the impeller locking control device is used for controlling the impeller braking device to brake and stop the rotating shaft at a preset locking position under the condition that the relative rotating distance detected by the position recognition device meets a preset distance range and the rotating speed of the impeller meets a preset rotating speed condition, so that the locking pin is driven to be inserted into the locking hole. A staged braking method can be provided to stop the rotating shaft at the preset locking position using two times of braking.)

1. An impeller lock control system of a wind generating set, the wind generating set including a stator main shaft and a rotation shaft, the rotation shaft rotatably connecting an impeller with the stator main shaft, the impeller lock control system comprising:

the impeller locking device comprises a locking pin arranged on the stator main shaft and a locking hole correspondingly arranged on the rotating shaft;

the impeller braking device is used for braking the rotor shaft to control the rotating speed of the impeller;

the position recognition device is used for detecting the relative rotating distance between the rotating shaft and a preset locking position;

and the impeller locking control device is used for controlling the impeller braking device to brake and stop the rotating shaft at a preset locking position under the condition that the relative rotating distance detected by the position recognition device meets a preset distance range and the rotating speed of the impeller meets a preset rotating speed condition, so that the locking pin is driven to be inserted into the locking hole.

2. The impeller locking control system of claim 1, wherein said impeller locking device further comprises an alignment detection unit for detecting whether said locking pin and said locking hole are aligned;

the impeller lock control means controls the locking pin to be inserted into the locking hole in a case where the rotating shaft is stopped at a preset locking position and the alignment detection unit detects that the locking pin and the locking hole are aligned.

3. The impeller lock control system according to claim 2, wherein the alignment detection unit includes:

and the distance sensor is arranged at the end part of the locking pin, and when the locking pin is aligned with the locking hole or is about to be aligned with the locking hole, a signal sent by the distance sensor is reflected by the locking hole to form a reflected signal.

4. The impeller lock control system according to claim 3,

the distance sensors comprise at least a first distance sensor and a second distance sensor;

the first distance sensor and the second distance sensor are respectively arranged on different edges of the end part of the locking pin;

the impeller locking control unit judges that the locking pin is aligned with the locking hole according to the fact that the first distance sensor and the second distance sensor both receive reflection signals.

5. The impeller lock control system according to any one of claims 1 to 4, wherein the position identifying means includes:

the video monitoring unit is arranged on a rotating mark on the rotating shaft and a fixing unit arranged on the stator main shaft; wherein the content of the first and second substances,

the video monitoring unit collects images containing a rotation identifier and a fixing unit, and detects the relative rotation distance based on the images.

6. The impeller lock control system of claim 5,

generating a first braking signal when the distance between the rotating identifier detected by the video monitoring unit and the fixing unit meets a first preset range and the rotating speed of the impeller meets a first rotating speed condition;

the impeller locking control device controls the impeller braking device to brake according to the first braking signal.

7. The impeller locking control system of claim 5, wherein said position identifying means further comprises:

the triggering unit is used for generating a second braking signal when the first distance sensor receives the reflection signal and the second distance sensor does not receive the reflection signal;

under the condition that the rotating speed of the impeller meets a second rotating speed condition, the impeller locking control device controls the impeller braking device to brake according to the second braking signal;

the connecting line of the first distance sensor and the second distance sensor is consistent with the direction of the rotating path of the rotating shaft, and the rotating direction of the rotating shaft is directed to the second distance sensor by the first distance sensor.

8. A method of controlling locking of an impeller of a wind power plant, the wind power plant comprising a stator main shaft and a rotating shaft rotatably connecting the impeller with the stator main shaft, the method comprising:

detecting the relative rotation distance between the rotating shaft and a preset locking position;

detecting the rotating speed of the impeller;

if the relative rotation distance meets a preset distance range and the impeller rotation speed meets a preset rotation speed condition, generating an impeller braking signal and braking the rotating shaft;

an impeller lock signal is generated if the impeller stop position matches a preset lock position.

9. The impeller lock control method according to claim 8, wherein in the step of generating the impeller lock signal,

detecting whether the locking pin is aligned with the locking hole if the impeller stop position matches a preset locking position;

generating the impeller lock signal if the lock pin is aligned with the lock hole.

10. The impeller lock control method according to claim 9, wherein in the step of detecting whether the locking pin is aligned with the locking hole,

the locking pin and the locking hole are aligned if both the first and second distance sensors receive reflected light signals; wherein the content of the first and second substances,

the first and second distance sensors are respectively provided at edges of the end of the locking pin.

11. The impeller lock control method according to any one of claims 8 to 10, wherein in the step of detecting the relative rotational distance of the rotational shaft from the preset lock position,

and acquiring an image containing a rotating identifier and a fixed unit, and detecting the relative rotating distance based on the image.

12. The impeller lock control method as claimed in claim 11, wherein the step of generating the impeller brake signal comprises:

and if the distance between the rotating identifier and the fixing unit meets a first preset range and the rotating speed of the impeller meets a first rotating speed condition, generating a first braking signal.

13. The impeller lock control method according to claim 12, wherein in the step of performing a braking operation on the rotating shaft,

and braking the rotating shaft based on the first braking signal.

14. The impeller lock control method as claimed in claim 12, wherein in the step of generating the impeller brake signal, further comprising:

if the first distance sensor receives the reflection signal and the second distance sensor does not receive the reflection signal, generating a second braking signal; wherein the content of the first and second substances,

the connecting line of the first distance sensor and the second distance sensor is consistent with the rotating path of the rotating shaft, and the rotating direction of the rotating shaft is directed to the second distance sensor by the first distance sensor.

15. The impeller lock control method according to claim 14, wherein in the step of performing a braking operation on the rotating shaft,

and if the impeller rotating speed meets the second rotating speed condition, performing braking operation on the rotating shaft based on a second braking signal.

16. A wind turbine generator set, comprising: the impeller lock control system of any one of claims 1 to 7.

17. A computer readable storage medium, characterized in that the computer readable storage medium stores program instructions that, when executed by a processor, cause the processor to perform the method of any of claims 8 to 15.

18. A computing device, comprising:

a processor;

a memory storing program instructions that, when executed by the processor, cause the processor to perform the method of any of claims 8 to 15.

Technical Field

The following description relates to the field of wind power generation, and more particularly, to an impeller locking control system, a control method and a wind turbine generator set.

Background

In recent years, wind power generation technology has been rapidly developed. In the installation, debugging and daily maintenance processes of the wind turbine generator, impeller locking operation needs to be carried out in advance so as to ensure the safety of operators and unit equipment. The impeller locking operation needs to be achieved by means of an impeller locking device mounted on the unit.

Currently, operators are generally required to climb into the nacelle, manually operating according to experience and visual results. Specifically, the impeller is decelerated through blade pitch variation or mechanical friction, when the rotating speed of the impeller is reduced to a certain range, an operator visually observes and estimates that the locking pin is just aligned with the locking hole, and then the impeller locking device is manually started.

As can be seen, prior impeller locking systems require a manual visual inspection of whether the impeller has rotated to a locked position. Because the judgment experience and the operation proficiency of operators are different, if the operator judges the rotating speed of the impeller to be wrong or the manual operation is not proper, the locking pin is damaged due to turning because the impeller is still in a rotating state and forced locking. In addition, if the rotor stops rotating suddenly due to forced locking in the rotation process of the impeller, impact load can be caused to the unit, and the service life of the unit is influenced.

Disclosure of Invention

In order to solve the above problems, the present invention provides an impeller locking control system, a control method, and a wind turbine generator system, which can control an impeller of the wind turbine generator system to brake and decelerate so as to stop rotating at a locking position, thereby automatically locking the impeller and preventing a locking pin from being damaged by turning.

According to an aspect of the present invention, there is provided an impeller lock control system of a wind turbine generator system including a stator main shaft and a rotation shaft rotatably connecting an impeller with the stator main shaft, the impeller lock control system including:

the impeller locking device comprises a locking pin arranged on the stator main shaft and a locking hole correspondingly arranged on the rotating shaft;

the impeller braking device is used for braking the rotor shaft to control the rotating speed of the impeller;

the position recognition device is used for detecting the relative rotating distance between the rotating shaft and a preset locking position;

and the impeller locking control device is used for controlling the impeller braking device to brake and stop the rotating shaft at a preset locking position under the condition that the relative rotating distance detected by the position recognition device meets a preset distance range and the rotating speed of the impeller meets a preset rotating speed condition, so that the locking pin is driven to be inserted into the locking hole.

According to another aspect of the present invention, there is provided an impeller lock control method of a wind turbine generator system including a stator main shaft and a rotating shaft rotatably connecting an impeller with the stator main shaft, the method including:

detecting the relative rotation distance between the rotating shaft and a preset locking position;

detecting the rotating speed of the impeller;

if the relative rotation distance meets a preset distance range and the impeller rotation speed meets a preset rotation speed condition, generating an impeller braking signal and braking the rotating shaft;

an impeller lock signal is generated if the impeller stop position matches a preset lock position.

According to another aspect of the invention, a wind generating set is provided, comprising the impeller locking control system.

According to another aspect of the present invention, there is provided a computer readable storage medium storing program instructions that, when executed by a processor, cause the processor to perform the above-described method.

According to another aspect of the present invention, there is provided a computing apparatus comprising:

a processor;

a memory storing program instructions that, when executed by the processor, cause the processor to perform the above-described method.

According to the impeller locking control system and the control method of the wind generating set, the impeller of the wind generating set can be controlled to brake and decelerate by monitoring the rotating speed of the impeller and the rotating position of the rotating shaft so as to stop rotating at the locking position, and then the impeller is automatically locked, so that the locking pin is prevented from being damaged by turning. In addition, the alignment state of the locking pin and the locking hole is detected, the dependence on personal experience of operators in the impeller locking process is reduced, and damage to the impeller locking pin due to misalignment is reduced. In addition, in the case of a strong wind or gust, a staged braking method can be provided, in which the rotating shaft is stopped at the preset locking position by two times of braking.

On the basis, the impeller locking control system of the wind generating set provided by the invention can also arrange the operation terminal at the tower bottom or a remote maintenance center, and an operator can execute impeller locking operation through the operation terminal. The operation can be completed at the tower bottom or a remote maintenance center without climbing the tower frame by operators, so that the tower climbing times and time of the operators can be reduced, the waiting time for locking the impeller is effectively reduced, and the power generation loss is reduced.

Drawings

FIG. 1 is a schematic view of a prior art impeller locking device installed in a wind turbine generator system;

FIG. 2 is a schematic view of an impeller in a rotating state according to an embodiment of the present invention;

FIG. 3 is a cross-sectional schematic view of a locking device according to an embodiment of the invention;

FIG. 4 is a schematic illustration of an operating condition of a lock device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an impeller lock control system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an impeller lock control method according to one embodiment of the present invention;

fig. 7 is a schematic diagram of an impeller lock control method according to another embodiment of the present invention.

Detailed Description

The present invention is susceptible to various modifications and embodiments, and it is to be understood that the present invention is not limited to these embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be changed as will become apparent after understanding the disclosure of the present application, except to the extent that operations must occur in a particular order. Moreover, descriptions of features known in the art may be omitted for greater clarity and conciseness. The terminology used in the exemplary embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the exemplary embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The impeller locking control system provided by the embodiment of the invention is mainly used for locking the impeller of the wind generating set so that workers can overhaul and maintain the wind generating set conveniently. Generally, the impeller is rotatably connected with a stator main shaft of the wind turbine generator system through a rotating shaft, and the impeller locking device comprises a locking pin arranged on the stator main shaft and a locking hole correspondingly arranged on the rotating shaft. The impeller locking control system provided by the embodiment of the invention can control the impeller locking device to automatically and accurately lock.

In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the impeller locking control system provided by the present invention in detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of an installation structure of an impeller locking device in a wind generating set in the prior art. The locking pin 4 is provided at a specific installation position on the stator main shaft 3, and the locking hole 5 is provided on the rotating shaft 2. In this example, the number of the locking holes 5 is plural, and is uniformly distributed on the same circumference on the rotating shaft 2. The locking pin 4 can lock the rotating shaft 2 by being inserted into any one of the locking holes 5. In addition, one end of the rotating shaft 2 is rotatably connected with the stator main shaft, and the other end of the rotating shaft is fixedly connected with the hub 1 of the wind driven generator impeller, so that the rotating shaft 2 is driven under the driving of the fan impeller. It is easily understood that although the locking device shown in fig. 1 has a correspondence between one locking pin and a plurality of locking holes, the present invention is not limited thereto, and those skilled in the art can appropriately increase the number of locking pins and appropriately set the positions of the respective locking pins and locking holes according to actual needs. For example, only one locking pin and one locking hole are provided, or a plurality of locking pins and locking holes, each of which corresponds in number and relative position to each other, are provided, and the like. The locking device which is improved based on the spirit and substance of the invention and can realize accurate locking of the impeller of the wind driven generator can be controlled by the impeller locking control system provided by the embodiment of the invention.

Fig. 2 is a schematic view showing a rotation state of the impeller according to the embodiment of the present invention, and only one locking pin and one locking hole are shown in the figure for the sake of simplifying the explanation. As shown in fig. 2, the rotating shaft 2 rotates in a clockwise direction perpendicular to the paper. The locking pin 4 is arranged on the bracket 41, and when the locking hole 5 moves to the position of the locking pin 4, the impeller locking can be completed by driving the locking pin 4 to be inserted into the locking hole 5. Since the bracket 41 needs to provide sufficient force to the locking pin 4 to keep the impeller stationary, the bracket 41 is typically designed to have a width and thickness such that the bracket 41 will block the locking hole 5 when the locking hole is moved to a position close to the locking pin 4. Therefore, it is inconvenient for the operator to visually observe the relative position between the lock pin 4 and the lock hole 5.

In one example of the invention, a rotary identifier 6 is provided on the rotary shaft 2 and, correspondingly, a fixing unit 7 is provided on the stator spindle. Specifically, the positional relationship of the rotary flag 6 and the fixing unit 7 is set such that the lock hole 5 is moved to the position of the lock pin 4 when the rotary flag 6 is moved to the position P, that is, when the rotary flag 6 is matched with the position of the fixing unit 7.

It should be noted that fig. 2 shows only one example of the rotary flag 6 and the fixing unit 7. It will be appreciated by those skilled in the art that the rotary flag 6 and the fixing unit 7 may be provided in other shapes and in other positions. As long as the relative distance between the locking hole 5 and the locking pin 4 can be estimated by observing the relative distance between the rotary flag 6 and the fixed unit 7.

For convenience of description, a position where the rotation mark 6 is matched with the fixing unit 7 is defined as a preset locking position of the rotation shaft 2.

For a large wind turbine generator system, the locking pins 4 may not be aligned with the locking holes 5 but slightly deviated after the rotation shaft 2 is rotated to the preset locking position due to the presence of machining errors and/or assembly errors, or due to deformation during operation. In this case, if the impeller is forcibly locked, the locking pin may be locked in the locking hole, and may not be unlocked, or even the pin body of the locking pin may be damaged.

In one example of the present invention, the impeller locking device further includes an alignment detection unit for detecting whether the locking pin 4 and the locking hole 5 are aligned. Referring to fig. 3, the alignment detection unit includes a distance sensor provided at the end 4 of the locking pin. The distance sensors comprise at least a first distance sensor 81 and a second distance sensor 82, respectively arranged at different edges of the end of the locking pin 4. The locking hole 5 is provided with a reflection portion 9, and during the rotation of the locking hole 5 along with the rotating shaft 2 (the arrow direction in fig. 3 indicates the rotation direction of the rotating shaft 2 relative to the stator main shaft 3), the reflection portion 9 located inside the locking hole 5 reflects the signal emitted by the distance sensor whenever the locking hole 5 passes the position of the locking pin 4 and the locking pin 4 is aligned with the locking hole 5 or is about to be aligned, and if the first distance sensor 81 and the second distance sensor 82 both receive the reflected signal, it is determined that the locking pin 4 is aligned with the locking hole 5.

Specifically, the distance sensor may be an infrared sensor, an eddy current sensor, a laser sensor, a proximity switch, or the like.

In addition, referring to fig. 4, in another state, the distance sensor provided by the present invention can also detect the relative distance between the locking pin 4 and the locking hole 5. Specifically, the first distance sensor 81 and the second distance sensor 82 are disposed such that a line connecting both coincides with the rotation path of the rotation shaft 2, and the rotation direction of the rotation shaft 2 is directed from the first distance sensor 81 to the second distance sensor 82. Thus, during the rotation of the lock hole 5 with the rotating shaft 2, the first distance sensor 81 receives the reflected signal every time the lock hole 5 passes the position where the lock pin 4 is located. Thus, when the first distance sensor 81 receives the reflected signal and the second distance sensor does not receive the reflected signal, it indicates that the locking pin 4 and the locking hole 5 are about to be aligned.

On the basis of the structure, the embodiment of the invention also provides an impeller locking control system, which determines the position capable of executing impeller braking by detecting the relative position of the rotating shaft and the stator main shaft, detects the alignment state of the locking pin and the locking hole on the basis, and automatically executes impeller locking operation according to the rotating speed and the alignment state of the impeller, reduces the dependence on personal experience of operators in the impeller locking process, and reduces the damage of the impeller locking pin caused by incorrect alignment.

The structure of the impeller lock control system according to the embodiment of the present invention will be described below with reference to fig. 2 and 5. The impeller lock control system includes an impeller lock means 51, an impeller brake means 52, a position recognition means 53, and an impeller lock control means 54.

The impeller locking means 51 comprises a locking pin 4 provided on the stator main shaft and a locking hole 5 correspondingly provided on the rotation shaft.

The impeller braking device 52 is used to brake the rotor shaft to control the impeller rotational speed.

The position recognition means 53 is used to detect the relative rotational distance of the rotational shaft from the preset lock position.

And an impeller locking control device 54 for controlling the impeller braking device 52 to brake and stop the rotating shaft at the preset locking position when the relative rotation distance detected by the position recognition device 53 satisfies the preset distance range and the impeller rotation speed satisfies the preset rotation speed condition, so as to drive the locking pin 4 to be inserted into the locking hole 5.

It should be noted that the impeller locking device 51 further includes an alignment detection unit (not shown in the drawings) for detecting whether the locking pin and the locking hole are aligned. In the case where the rotating shaft is stopped at the preset locking position and the alignment detecting unit detects that the locking pin 4 and the locking hole 5 are aligned, the impeller lock control device 54 controls the locking pin to be inserted into the locking hole.

Wherein the registration detection unit includes a distance sensor provided at an end of the locking pin, the distance sensor including at least a first distance sensor 81 and a second distance sensor 82. As described above, the signal from the distance sensor is reflected by the locking hole 5 to form a reflected signal, and accordingly, the impeller lock control unit 54 determines that the locking pin and the locking hole are aligned based on the reflected signals received by both the first distance sensor 81 and the second distance sensor 82.

In one example, the position recognition device 53 includes a video monitoring unit (not shown in the figure), a rotation indicator 6 provided on the rotation shaft, and a fixing unit 7 provided on the stator main shaft. The video monitoring unit collects images containing the rotating identifier 6 and the fixing unit 7, and detects the relative rotating distance based on the collected images. Specifically, the video monitoring unit may be a high-definition camera or other video acquisition devices, and an image learning algorithm may be run inside the video monitoring unit to perform image recognition.

It should be noted that the position recognition device 53 further includes a trigger unit (not shown in the figure). The trigger unit is connected with the first distance sensor 81 and the second distance sensor 82, and collects sensing signals of the first distance sensor 81 and the second distance sensor 82, so that the relative positions of the locking pin 4 and the locking hole 5 can be more accurately positioned. Referring to fig. 4, when the left sidewall of the locking hole 5 runs above the first distance sensor 81, the first distance sensor can receive the reflection signal, and the second distance sensor does not receive the reflection signal. Thereby, the trigger unit can detect that the lock hole 5 is about to rotate above the lock pin 4.

In addition, the wheel-lock control system also includes an operator terminal 56 that is connected to the wheel-lock control device 54. The operator terminal 56 may be located at the nacelle, tower bottom, or remote maintenance center, and an operator performs the impeller locking operation through the operator terminal 56. The operation can be completed at the tower bottom or a remote maintenance center without climbing the tower frame by operators, so that the tower climbing times and time of the operators can be reduced, the waiting time for locking the impeller is effectively reduced, and the power generation loss is reduced.

The flow of the impeller lock control method according to an embodiment of the present invention is described below with reference to fig. 6.

In step S610, a relative rotation distance of the rotation shaft from the preset lock position is detected. For example, a video monitoring unit may be used to capture an image containing a rotating identifier and a stationary unit and detect the relative rotational distance based on the image.

In step S630, it is determined whether the relative rotation distance satisfies a preset distance range. The preset distance range is set for braking the rotating shaft in advance for a period of time so that the rotating speed of the rotating shaft is slowly reduced to prevent the unit from generating vibration due to sudden braking. For example, the preset distance range may be set to an angular distance between the rotary flag and the fixed unit of 30 degrees, 60 degrees, or other values.

In step S620, the impeller rotation speed is detected. In step S640, it is determined whether the impeller rotation speed satisfies a preset rotation speed condition. The predetermined speed condition may be, for example, 0.8rpm, i.e., the subsequent braking and locking operation sequence is performed when the impeller speed is less than 0.8 rpm.

If it is determined at step S630 that the relative rotation distance has satisfied the preset distance range and it is determined at step S640 that the impeller rotation speed has satisfied the preset rotation speed condition, the impeller lock control means 54 generates an impeller braking signal to control the impeller braking means 52 to brake the rotation shaft at step S650. The impeller braking signal may be, for example, a hydraulic control signal, and the hydraulic cylinder drives the brake pad to slowly decrease the rotation speed of the rotating shaft.

The impeller braking signal indicates the magnitude of the braking force acting on the rotating shaft. The magnitude of the braking force is related to the impeller speed and the predetermined distance range in order to ensure that the rotating shaft stops properly when moving to the predetermined locked position.

In step S660, it is determined whether the impeller stop position matches the preset lock position. If so, an impeller lock signal is generated and the impeller lock control means 54 controls the impeller lock means 51 to lock at step S670. If the locking holes and the locking pins are not aligned, the locking operation cannot be carried out, and the process is ended.

It should be noted that the judgment of step 660 is to ensure that the locking pin is inserted into the locking hole when the rotating shaft is in a stationary state, so as to prevent the rotating shaft from being forcibly locked while still in a rotating state, which may result in damage to the pin body.

In the process of generating the impeller locking signal in step S670, it is also necessary to detect whether the locking pin is aligned with the locking hole using the alignment detection unit. For example, the registration detection unit detects the reflected signals received by the first and second distance sensors, and if both sensors receive the reflected signals, the locking pin and the locking hole are already aligned.

As can be seen from the exemplary embodiment depicted in fig. 6, the impeller lock control method of the present embodiment can ensure that the rotation shaft stops just when moving to the preset lock position, and maintain the lock pin in accurate alignment with the lock hole.

The flow of the impeller lock control method according to another embodiment of the present invention is described below with reference to fig. 7, and a staged braking method is provided to stop the rotating shaft at the preset lock position by using two times of braking. In fig. 7, the processes of step S610, step S620, step S630, step S660, and step S670 are the same as those of the corresponding steps shown in fig. 6.

Referring to fig. 7, it is detected whether the rotation speed of the impeller satisfies the first rotation speed condition at step S641, and if the first rotation speed condition is satisfied and it is determined that the relative rotation distance satisfies the preset distance range at step S630, a first brake signal is generated at step S651. The impeller locking control device 54 controls the impeller braking device 52 to perform the first braking according to the first braking signal.

Referring to fig. 4, under the first braking, the rotation shaft is slowly rotated in the arrow direction shown in fig. 4. Before the rotation to the preset locking position, a gust of wind may occur to cause the impeller rotation speed to increase from the expected rotation speed, which will cause the rotation shaft to have a certain rotation speed after the rotation to the preset locking position. In particular, large wind turbine generators have a large moment of inertia even at low impeller speeds, in which case the locking operation can only be abandoned in order to protect the locking pin.

In response to the above-described problem of gusts occurring after the first braking, the present example provides a second braking operation. Specifically, as shown in fig. 4, when the left sidewall of the lock hole 5 runs above the first distance sensor 81, the first distance sensor can receive the reflection signal, and the second distance sensor does not receive the reflection signal. Therefore, the triggering unit generates the second braking signal when the first distance sensor receives the reflection signal and the second distance sensor does not receive the reflection signal.

In step S652, it is determined whether the first distance sensor receives the reflection signal, and the second distance sensor does not receive the reflection signal. If so, the triggering unit generates a second braking signal.

In step S653, it is determined whether the impeller rotation speed satisfies the second rotation speed condition, and if so, in step S654, the impeller lock control means 54 generates a second brake signal, and the impeller brake means 52 performs a brake operation on the rotating shaft based on the second brake signal, so that the rotating shaft stops rotating when the left sidewall of the lock hole 5 runs to the position of the first distance sensor 81.

The first rotational speed and the second rotational speed are explained here. The embodiment is suitable for environments with high wind speed or frequent wind gusts. Due to the two braking operations, the first rotational speed may be slightly higher, for example 0.9rpm, and the second rotational speed may be, for example, in the range of 0.05 to 0.1 rpm. Typically the first rotational speed is higher than the second rotational speed.

As can be seen from the example described in fig. 7, the impeller locking control method provided by the present invention can provide two intermittent braking operations, ensure that the impeller is accurately stopped at the preset locking position, and can improve the safety of the impeller locking operation, especially under the condition of strong wind or gust.

According to example embodiments of the inventive concepts, the various steps of the methods described in fig. 6 and 7 and their operations may be written as programs or software. Programs or software may be written in any programming language based on the block diagrams and flow diagrams illustrated in the figures and the corresponding description in the specification. In one example, the program or software can include machine code that is directly executed by one or more processors or computers, such as machine code produced by a compiler. In another example, the program or software includes higher level code that is executed by one or more processors or computers using an interpreter. The program or software may be recorded, stored, or fixed in one or more non-transitory computer-readable storage media. In one example, the program or software or one or more non-transitory computer-readable storage media may be distributed on a computer system.

According to example embodiments of the inventive concepts, the various steps of the methods described in fig. 6 and 7, and the operations thereof, may be implemented on a computing device comprising a processor and a memory. The memory stores program instructions for controlling the processor to implement the operations of the various units described above.

Although specific example embodiments of the present invention have been described in detail above with reference to fig. 1 to 7, the present invention may be modified in various forms without departing from the spirit and scope of the inventive concept. Suitable results may be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, or devices are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents are to be construed as being included in the present disclosure.