A yaw control method and device for a wind turbine generator system

Abstract

The application discloses a kind of wind generating set yaw control method and device, including steps, S1, obtain current wind direction information and cabin angle information;S2, judge whether the angle between current wind direction and cabin exceeds preset limit value, if exceeds, unit starts yaw to wind, if not exceed, then repeat execution step S2;S3, judge whether yaw speed is lower than the rated yaw speed preset limit value, if lower than, identify as yawing and not moving, make unit stop yaw to wind, and after preset time, unit restores automatic yaw function, re-wind yaw, and repeat execution step S3, if not lower than, then execute next step;S4, judge whether yaw motor current value exceeds rated current preset limit value, if exceeds, identify as yawing and not moving, make unit stop yaw to wind and report fault, if not exceed, then unit continues yawing.The application can identify and stop in time in the case of yawing and not moving during unit yawing, effectively reduce the high failure rate of wind generating set yaw drive damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of yaw control of wind turbine generators, in particular to a yaw control method and device for wind turbine generators. BACKGROUND

[0002] With the rapid development of the wind power industry, more and more wind turbines are installed in mountainous areas, gobi, plateaus and deep seas, and the wind conditions are more and more complex. The yaw drive damage of wind turbine generators is becoming more and more prominent. Most of the damage is caused by excessive external load and unreasonable yaw control strategy, which leads to overloading and damage of the yaw drive. At present, the industry mostly determines whether to start yaw by judging the size of the external load before yaw starts, or controls the overspeed during the yaw process, but ignores the identification and control of the yawing and not moving during the yaw process. Hard yawing when yawing and not moving during the yaw process can cause damage to the drive due to stalling, and the damage forms such as broken shafts of yaw drive sun gears at all levels, broken teeth of yaw drive output teeth, and even broken teeth of yaw bearing big gear rings, which can cause damage to the yaw bearing and make the replacement of large parts extremely expensive. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a yaw control method for wind turbine generators, which can identify the not moving condition during the yaw process of the unit and stop the unit in time, effectively reduce the high failure rate of yaw drive damage of wind turbine generators, and protect the yaw drive.

[0004] Another object of the present application is to provide a yaw control device for wind turbine generators.

[0005] The object of the present application is achieved by the following technical solutions:

[0006] A yaw control method for wind turbine generators, comprising the steps of:

[0007] S1, obtaining current wind direction information and nacelle angle information;

[0008] S2, determining whether the angle between the current wind direction and the nacelle exceeds a preset limit value based on the wind direction information, if the preset limit value is exceeded, the unit starts yawing to wind, if the preset limit value is not exceeded, the step S2 is repeatedly executed;

[0009] S3, during the yawing to wind process of the unit, the yawing speed is determined in real time according to the nacelle angle information within a preset time, if the yawing speed is lower than the rated yawing speed preset limit value, it is identified that the yawing is not moving, the unit stops yawing to wind, and the unit restores the automatic yawing function after the preset time, re-wind yawing, and the step S3 is repeatedly executed, if the yawing speed is not lower than the rated yawing speed preset limit value, the next step is executed;

[0010] In the process of unit yawing to wind, it is judged whether the yaw motor current value exceeds the rated current preset limit value, if exceeding the rated current preset limit value, it is identified that the yaw is not moving, the unit is stopped yawing to wind and the yaw fault is reported, if not exceeding the rated current preset limit value, the unit continues to yaw.

[0011] Further, in step S1, the current wind direction information is acquired by using the anemorumbometer and sent to the unit PLC controller, and the cabin angle information is acquired by using the yaw position encoder and sent to the unit PLC controller.

[0012] Further, in step S2, the following operations are specifically performed,

[0013] The unit PLC controller judges whether the angle between the current wind direction and the cabin exceeds the preset limit value based on the wind direction information, if exceeding the preset limit value, the unit PLC controller starts the yaw motor to run, and then makes the unit yaw to wind through the yaw driving action, if not exceeding the preset limit value, step S2 is repeatedly performed.

[0014] Further, in step S3, the following operations are specifically performed,

[0015] In the process of unit yawing to wind, the unit PLC controller judges whether the yaw speed is lower than the rated yaw speed preset limit value in real time according to the cabin angle information detected by the yaw encoder within the preset time, if lower than the preset limit value, it is identified that the yaw is not moving, the unit PLC controller controls the yaw motor to stop running, and then the unit stops yawing to wind, and the unit restores the automatic yawing function after the preset time, re-yaws to wind, and step S3 is repeatedly performed, if not lower than the preset limit value, the next step is performed.

[0016] Further, the unit PLC controller sends instructions to the yaw motor through the yaw frequency converter.

[0017] Further, in step S4, the following operations are specifically performed,

[0018] In the process of unit yawing to wind, the current detection module detects whether the yaw motor current value exceeds the rated current preset limit value, if exceeding, the unit PLC controller identifies that the yaw is not moving, the unit is stopped yawing to wind and the yaw fault is reported, if not exceeding, the unit continues to yaw.

[0019] Further, the current detection module is a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

[0020] Further, the preset limit value ranges from 1.0 to 1.15 times of the rated current.

[0021] Another object of the application is achieved by the following technical scheme:

[0022] A yaw control device of a wind turbine generator set for implementing the yaw control method of the wind turbine generator set, comprising a wind speed and direction indicator, a yaw position encoder, a current detection module, a yaw motor, a yaw drive and a set PLC controller, the wind speed and direction indicator is electrically connected with the set PLC controller, used for obtaining current wind direction information and sending the wind direction information to the set PLC controller, and then determining whether the set needs to yaw against the wind by the set PLC controller, the yaw position encoder is electrically connected with the set PLC controller, used for obtaining cabin angle information and sending to the set PLC controller, and then determining whether the yaw process is moving by the set PLC controller, the current detection module is electrically connected with the set PLC controller, used for detecting whether the current value of the yaw motor exceeds the rated current preset limit value and sending to the set PLC controller, and then determining whether the yaw process is moving by the set PLC controller, the yaw drive is electrically connected with the set PLC controller through the yaw motor, and the yaw motor is controlled to start and stop by the set PLC controller, so that the yaw drive is operated or stopped, so as to realize the start or stop of the yaw of the set.

[0023] Further, the current detection module is a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

[0024] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0025] The present application optimizes the yaw control strategy in the original main control program of the set, the implementation is simple, can identify and stop the set yaw process in time, effectively reduces the high failure rate of the wind turbine generator set yaw drive, avoids the yaw drive damage, avoids the yaw bearing large part damage and replacement, reduces the operation and maintenance cost of the set, and prolongs the service life of the set. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The flowchart of the yaw control method of the present application.

[0027] Figure 2 The structure diagram of the yaw control device of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Embodiment 1:

[0030] As Figure 1 shown, the embodiment provides a yaw control method of a wind turbine generator set, comprising steps of

[0031] S1, obtaining current wind direction information by using an anemorumbometer and sending the information to a set PLC controller, and obtaining cabin angle information by using a yaw position encoder and sending the information to the set PLC controller.

[0032] S2, judging whether the angle between the current wind direction and the cabin exceeds a preset limit value based on the wind direction information, if the angle exceeds the preset limit value, the set starts yawing against the wind, if the angle does not exceed the preset limit value, repeating step S2; the following operations are specifically performed,

[0033] whether the angle between the current wind direction and the cabin exceeds a preset limit value based on the wind direction information, if the angle exceeds the preset limit value, the set PLC controller starts the yaw motor to run, and then makes the set yaw against the wind through yaw driving action, if the angle does not exceed the preset limit value, repeating step S2.

[0034] S3, during the process of the set yawing against the wind, judging whether the yaw speed is lower than a preset limit value of a rated yaw speed according to the cabin angle information within a preset time, if the yaw speed is lower than the preset limit value of the rated yaw speed, identifying that the yaw is not moving, making the set stop yawing against the wind, and after a certain time, the set resumes the automatic yaw function to re-yaw against the wind, and repeating step S3, if the yaw speed is not lower than the preset limit value of the rated yaw speed, executing the next step; the following operations are specifically performed,

[0035] during the process of the set yawing against the wind, the set PLC controller judges whether the yaw speed is lower than a preset limit value of a rated yaw speed according to the cabin angle information detected by the yaw encoder within a preset time, if the yaw speed is lower than the preset limit value, identifying that the yaw is not moving, the set PLC controller controls the yaw motor to stop running, and then makes the set stop yawing against the wind, and after a preset time, the set resumes the automatic yaw function to re-yaw against the wind, and repeating step S3, if the yaw speed is not lower than the preset limit value, executing the next step.

[0036] Specifically, if the set is provided with a yaw frequency converter, the set PLC controller indirectly starts the yaw motor by giving an instruction to the yaw frequency converter.

[0037] S4, during the process of the set yawing against the wind, judging whether the yaw motor current value exceeds a preset limit value of a rated current, if the yaw motor current value exceeds the preset limit value of the rated current, identifying that the yaw is not moving, making the set stop yawing against the wind and reporting a yaw fault, if the yaw motor current value does not exceed the preset limit value of the rated current, the set continues to yaw; the following operations are specifically performed,

[0038] During the yawing process of the unit, the current detection module is used to detect whether the yaw motor current value exceeds the preset limit value of the rated current, the preset limit value ranges from 1.0 to 1.15 times of the rated current, and the yawing is not movable if the preset limit value is too large, so that the unit stops yawing against the wind and reports the yawing fault, and the unit continues to yaw if the preset limit value is not exceeded.

[0039] The current detection module can be a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

[0040] The yaw control strategy in the original main control program of the unit PLC controller is optimized, the yawing is not movable when the yaw damping (such as wind load, yaw bearing friction torque, yaw half-release torque, etc.) is too large during the yawing process, and the unit is stopped in time to protect the yaw drive, reduce the operation and maintenance cost of the unit, and prolong the service life of the unit.

[0041] Embodiment 2:

[0042] As shown in Figure 2 The embodiment provides a wind turbine yaw control device for realizing the wind turbine yaw control method of embodiment 1, which comprises a wind speed and direction instrument, a yaw position encoder, a current detection module, a yaw motor, a yaw drive and a unit PLC controller, the wind speed and direction instrument is electrically connected with the unit PLC controller, is used to acquire current wind direction information, and sends the wind direction information to the unit PLC controller, and then the unit PLC controller judges whether the unit needs to yaw against the wind, the yaw position encoder is electrically connected with the unit PLC controller, is used to acquire the cabin angle information, and sends the cabin angle information to the unit PLC controller, and then the unit PLC controller judges whether the yawing is movable during the yawing process, the current detection module is electrically connected with the unit PLC controller, is used to detect whether the yaw motor current value exceeds the preset limit value of the rated current, and sends the current detection module to the unit PLC controller, that is, whether the current is overloaded, and then the unit PLC controller judges whether the yawing is movable during the yawing process, the yaw drive is electrically connected with the unit PLC controller through the yaw motor, the yaw motor is started and stopped through the unit PLC controller, and then the yaw drive is operated or stopped, so as to realize the start or stop of the unit yawing, and the unit PLC controller stores and executes the wind turbine yaw control method of embodiment 1.

[0043] Specifically, the current detection module is a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

[0044] The above merely describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the scope disclosed by the present application, and such replacements or changes shall also fall within the protection scope of the present application.

Claims

1. A yaw control method for a wind turbine generator set, characterized in that: Including steps, S1. Obtain current wind direction information and cabin angle information; S2. Determine whether the angle between the current wind direction and the nacelle exceeds a preset limit based on the wind direction information. If so, the unit initiates yaw to face the wind. If not, repeat step S2. S3. During the yaw-to-wind process, the yaw speed is determined in real time based on the cabin angle information within a preset time period to determine whether it is lower than the preset limit of the rated yaw speed. If so, the yaw is identified as immobile, and the yaw-to-wind function is stopped. After a preset time, the automatic yaw function is restored, and the yaw is re-oriented to the wind, and step S3 is repeated. If the yaw speed is not lower than the preset limit of the rated yaw speed, the next step is executed. S4. During the yaw process of the unit, determine whether the yaw motor current value exceeds the preset limit of the rated current. If it exceeds the preset limit of the rated current, it is identified as yaw failure, and the unit stops yawing into the wind and reports a yaw fault. If it does not exceed the preset limit of the rated current, the unit continues to yaw.

2. The yaw control method of a wind turbine generator set according to claim 1, characterized in that: In step S1, the current wind direction information is obtained by using an anemometer and anemometer, and sent to the unit PLC controller. The yaw position encoder is used to obtain the cabin angle information and sent to the unit PLC controller.

3. The yaw control method of a wind turbine generator set according to claim 1, characterized in that: In step S2, the following operations are specifically performed: The unit PLC controller determines whether the angle between the current wind direction and the cabin exceeds the preset limit based on the wind direction information. If it exceeds the preset limit, the unit PLC controller starts the yaw motor to run, and then uses the yaw drive action to make the unit yaw to the wind. If it does not exceed the preset limit, step S2 is repeated.

4. The yaw control method of a wind turbine generator set according to claim 1, characterized in that: In step S3, the following operations are specifically performed: During the yaw process of the unit, the unit PLC controller determines in real time whether the yaw speed is lower than the preset limit of the rated yaw speed based on the cabin angle information detected by the yaw encoder within the preset time. If it is lower than the preset limit, it is identified as yaw motionless, and the unit PLC controller controls the yaw motor to stop running, thereby stopping the unit from yawing into the wind. After the preset time, the unit restores the automatic yaw function, yaws into the wind again, and repeats step S3. If it is not lower than the preset limit, the next step is executed.

5. The yaw control method of a wind turbine generator set according to claim 4, characterized in that: The PLC controller of the unit sends instructions to the yaw motor through the yaw frequency converter.

6. The yaw control method of a wind turbine generator set according to claim 1, characterized in that: In step S4, the following operations are specifically performed: During the yaw process of the unit, the current detection module detects whether the yaw motor current value exceeds the preset limit of the rated current. If it exceeds, the unit PLC controller will identify it as yaw failure, stop the unit from yawing and report a yaw fault. If it does not exceed, the unit will continue to yaw.

7. The yaw control method of a wind turbine generator set according to claim 6, characterized in that: The current detection module is a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

8. The yaw control method of a wind turbine generator set according to claim 6, characterized in that: The preset limit value ranges from 1.0 to 1.15 times the rated current.

9. A yaw control device for a wind turbine generator set, characterized in that: A method for controlling the yaw of a wind turbine generator set according to any one of claims 1 to 8, comprising an anemometer, a yaw position encoder, a current detection module, a yaw motor, a yaw drive, and a PLC controller for the generator set, wherein the anemometer is electrically connected to the PLC controller for obtaining current wind direction information and sending the wind direction information to the PLC controller, so that the PLC controller can then determine whether the generator set needs to yaw to face the wind; the yaw position encoder is electrically connected to the PLC controller for obtaining nacelle angle information and sending the information to the PLC controller, so that the PLC controller can then determine whether the generator set can yaw; the current detection module is electrically connected to the PLC controller for detecting whether the yaw motor current value exceeds a preset rated current limit and sending the information to the PLC controller, so that the PLC controller can then determine whether the generator set can yaw; the yaw drive is electrically connected to the PLC controller via the yaw motor, and the PLC controller controls the start and stop of the yaw motor to thereby cause the yaw drive to operate or stop, thereby starting or stopping the generator set yaw.

10. The yaw control device for a wind turbine generator set according to claim 9, characterized in that: The current detection module is a yaw frequency converter, a current transformer, a thermal relay or a motor protection circuit breaker.

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