Yaw cable twisting angle detection method of wind generating set

Abstract

The invention discloses a yaw cable twisting angle detection method of a wind generating set. The yaw cable twisting angle of the wind generating set is detected and calculated based on a single proximity switch sensor. Wherein in the operation process of the wind generating set, the proximity switch sensor obtains a high-low level conversion signal based on the identification position conversion condition of the corresponding yaw gear, and then calculates a yaw cable twisting angle based on the high-low level conversion signal; according to the invention, the hardware cost is obviously saved, the condition restriction that two proximity switches have high requirements on the installation positions of the two proximity switches is eliminated, and the installation is rapid and convenient.

Description

Technical Field

[0001] The invention belongs to the field of wind turbine generator sets, and in particular relates to a method for detecting a yaw twist cable angle of a wind turbine generator set. Background Art

[0002] The yaw system is an important component of wind turbines and is the key to whether the wind turbine can accurately face the wind and maximize wind energy utilization. The twist cable angle is an important parameter of the wind turbine yaw system. The accuracy of its calculation is not only related to the accuracy of the wind turbine yaw facing the wind, but also to whether the wind turbine power cable can be twisted and whether it can maintain safe operation.

[0003] The existing wind turbine yaw system usually uses the high and low level sequence generated by the relative distance between two proximity switches and the wind turbine yaw gear to determine the direction and angle of the wind turbine yaw. This method not only requires two proximity switches, which increases the cost, but also during on-site installation, in order to achieve the effect of the generated high and low level sequence being consistent with the theoretical design, it also puts forward higher requirements on the installation position of the two proximity switches. Once there is a slight deviation, it will affect the calculation accuracy of the twist cable angle, thereby affecting the yaw control strategy and increasing the risk of cable breakage.

[0004] Therefore, the applicant hopes to seek technical solutions to improve the above technical problems. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a method for detecting the yaw cable angle of a wind turbine generator set, which not only significantly saves hardware costs, but also eliminates the conditional constraints of using two proximity switches and having high requirements on the installation positions of both, and the installation is quick and convenient.

[0006] To this end, the technical solution adopted in the present invention is as follows: A method for detecting the yaw twist cable angle of a wind turbine generator set is based on a single proximity switch sensor to detect and calculate the yaw twist cable angle of the wind turbine generator set; wherein, during the operation of the wind turbine generator set, the proximity switch sensor obtains a high-low level conversion signal based on the change in the identification position of its corresponding yaw gear, and then calculates the yaw twist cable angle based on the high-low level conversion signal.

[0007] Preferably, the outer periphery of the yaw gear is composed of tooth tops and tooth spaces that are alternately distributed, wherein the proximity switch sensor is installed on the periphery of the yaw gear.

[0008] Preferably, the high-low level conversion signal obtained based on the change of the identification position of the corresponding yaw gear includes: during the operation of the wind turbine generator set, the yaw gear performs a clockwise or counterclockwise yaw rotation, and the corresponding identification position of the proximity switch sensor is changed between the tooth top and the tooth gap, so that the proximity switch sensor generates a corresponding high-low level alternating conversion signal.

[0009] Preferably, the high-low level alternating conversion signal is used to determine whether the yaw gear is at a rising edge or a falling edge, and the yaw pulse calculation value is calculated based on the clockwise or counterclockwise yaw output signal output by the main control of the wind turbine generator set; wherein, When the yaw is clockwise: every time a rising edge or a falling edge appears, the yaw pulse calculation value is accumulated and calculated; When the yaw is counterclockwise: every time a rising edge or a falling edge appears, the yaw pulse calculation value is decremented.

[0010] Preferably, the yaw pulse calculation value is defined as Count, the number of teeth of the yaw gear is Pulses, and the yaw twist cable angle CableTwistAngle = 360 * Count / (Pulses * 2).

[0011] Preferably, in order to avoid deviation in the calculation of the yaw twist cable angle, a zero position reset sensor is installed at the twist cable zero degree position of the yaw gear; wherein the zero position reset sensor triggers a high level pulse signal every time the yaw gear turns to this position, and the signal is used as a zero position reset signal, and the yaw twist cable angle is zero-calibrated based on the zero position reset signal.

[0012] Preferably, the zero position calibration process of the yaw twist cable angle includes: The zero position pulse count is determined based on the number of full yaw rotations of the yaw gear. The zero position pulse count = the number of full yaw rotations of the yaw gear * Pulses * 2, where Pulses is the number of teeth of the yaw gear. When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count; when it is greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter, and when it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°. When it is less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°.

[0013] Preferably, the zero position calibration process of the yaw twist cable angle includes: When the zero reset signal is triggered, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter. When it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°.

[0014] Preferably, the zero position calibration process of the yaw twist cable angle includes: When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count.

[0015] Preferably, the preset parameter A is 22-25, preferably 24; the preset time parameter B1 is 11-13 minutes, more preferably 12 minutes; and the preset time parameter B2 is twice the preset time parameter B1.

[0016] It should be noted that the proximity switch sensor involved in the present application can be selected from existing well-known proximity switch sensors, and the present application has no special restrictions on them.

[0017] The present invention uses one proximity switch sensor to detect and calculate the yaw twist cable angle of the wind turbine. Compared with the existing detection method using two proximity switches, it not only significantly saves hardware costs, but also eliminates the condition that the two proximity switches have high requirements on the installation positions of the two, and the installation is fast and convenient. The present invention further proposes a calibration method for the yaw twist cable angle, which further improves the detection accuracy and reliability of the present application, and effectively solves the problem of inaccurate twist cable angle detection and calculation caused by adverse conditions such as yaw gear wear and poor meshing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the distribution structure of the yaw gear 1 (only as a shape illustration, the number of teeth shown has no correlation with the actual number of teeth in the embodiment) and the proximity switch sensor 2 in the specific implementation mode of the present application. DETAILED DESCRIPTION

[0019] An embodiment of the present invention discloses a method for detecting the yaw twist cable angle of a wind turbine generator set, which detects and calculates the yaw twist cable angle of the wind turbine generator set based on a single proximity switch sensor; wherein, during the operation of the wind turbine generator set, the proximity switch sensor obtains a high-low level conversion signal based on the identification position change of its corresponding yaw gear, and then calculates the yaw twist cable angle based on the high-low level conversion signal.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Example 1: Please see Figure 1 As shown, this embodiment provides a method for detecting the yaw twist cable angle of a wind turbine generator set, which detects and calculates the yaw twist cable angle of the wind turbine generator set based on a single proximity switch sensor 2; preferably, in this embodiment, the outer periphery of the yaw gear 1 is composed of alternatingly distributed tooth tops 1a and tooth spaces 1b, wherein the proximity switch sensor 2 is installed on the periphery of the yaw gear 1.

[0022] In this embodiment, during the operation of the wind turbine generator set, the proximity switch sensor 2 obtains a high-low level conversion signal based on the change of the identification position of the corresponding yaw gear 1, and then calculates the yaw cable angle based on the high-low level conversion signal; preferably, in this embodiment, the high-low level conversion signal obtained based on the change of the identification position of the corresponding yaw gear 1 includes: during the operation of the wind turbine generator set, the yaw gear 1 performs a clockwise or counterclockwise yaw rotation, and the corresponding identification position of the proximity switch sensor 2 changes between the tooth top 1a and the tooth space 1b, so that the proximity switch sensor 2 generates a corresponding high-low level alternating conversion signal.

[0023] Preferably, in the present embodiment, the high-low level alternating conversion signal is used to determine whether the yaw gear 1 is at the rising edge or the falling edge (that is, the proximity switch sensor 2 detects that it has fallen at the position 1b between the teeth), and the yaw pulse calculation value is calculated based on the clockwise or counterclockwise yaw output signal output by the main control of the wind turbine generator set; specifically, in the present embodiment, when the yaw gear 1 is at the rising edge, it means that the proximity switch sensor 2 detects that it has fallen at the position 1a between the teeth, and when the yaw gear 1 is at the falling edge, it means that the proximity switch sensor 2 detects that it has fallen at the position 1b between the teeth; of course, in other embodiments, it can also be defined as follows: when the yaw gear 1 is at the rising edge, it means that the proximity switch sensor 2 detects that it has fallen at the position 1b between the teeth, and when the yaw gear 1 is at the falling edge, it means that the proximity switch sensor 2 detects that it has fallen at the position 1a between the teeth; In this embodiment, when the yaw is clockwise: each time a rising edge or a falling edge appears, the yaw pulse calculation value is accumulated and calculated; when the yaw is counterclockwise: each time a rising edge or a falling edge appears, the yaw pulse calculation value is decremented and calculated.

[0024] Preferably, in this embodiment, the yaw pulse calculation value is defined as Count, the number of teeth of the yaw gear 1 is Pulses, and the yaw twist cable angle CableTwistAngle = 360 * Count / (Pulses * 2).

[0025] Embodiment 2: The remaining technical solutions of this embodiment 2 are the same as those of embodiment 1, except that, in this embodiment 2, in order to avoid deviation in the calculation of the yaw twist cable angle, a zero position reset sensor is installed at the twist cable zero position of the yaw gear 1; wherein, the zero position reset sensor triggers a high-level pulse signal whenever the yaw gear 1 rotates to this position, and the signal is used as a zero position reset signal, and the yaw twist cable angle is zero-calibrated based on the zero position reset signal; Preferably, in this embodiment, the zero position calibration process of the yaw twist cable angle is as follows: The zero position pulse count is determined based on the number of full yaw rotations of the yaw gear 1. The zero position pulse count = the number of full yaw rotations of the yaw gear 1 * Pulses * 2, where Pulses is the number of gears of the yaw gear 1. When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count; when it is greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter, and when it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and When it is equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°.

[0026] It should be noted that those skilled in the art can determine the preset parameter A and the preset time parameter B1 according to the actual number of teeth of the yaw gear and actual engineering cases, and this application does not make any sole limitation thereto; Preferably, in this embodiment, the preset parameter A is 22-25; the preset time parameter B1 is 11-13 minutes; the preset time parameter B2 is twice the preset time parameter B1; specifically preferably, in this embodiment, the preset parameter A is 24, the preset time parameter B1 is 12 minutes, and the preset time parameter B2 is 24 minutes.

[0027] In conjunction with this embodiment 2, the origin of setting the preset parameter A and the preset time parameter B1 is further explained: The origin of the setting of the preset parameter A: According to the principle of yaw reset zeroing and combined with actual engineering experience, the deviation of the twist cable angle will generally not be greater than 90° after each yaw rotation, so an angle value between 0°-90° is selected; 30.7° is specifically selected in this embodiment, and the number of teeth of the yaw sprocket in this embodiment is 141; the angle of one rotation of the yaw sprocket is 360°, and the corresponding accumulated number of pulses is twice the number of teeth of the yaw sprocket, that is, 282; therefore, the accumulated number of pulses corresponding to 30.7° = 30.7° / (360° / 282) = 24, which is used as the value of the preset parameter A; Origin of setting the preset time parameter B1: According to statistical values, in this actual application case, the time taken by the wind turbine to complete a normal yaw cycle is about 15 minutes, so the preset time parameter B1 is set to 12 minutes.

[0028] Embodiment 3: The remaining technical solutions of this embodiment 3 are the same as those of embodiment 2, except that, in this embodiment 3, the zero position calibration process of the yaw twist cable angle is as follows: When the zero reset signal is triggered, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter. When it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, The yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°; specifically, preferably, in this embodiment, the preset time parameter B1 is 12 minutes, and the preset time parameter B2 is 24 minutes.

[0029] Embodiment 4: The remaining technical solutions of this embodiment 4 are the same as those of embodiment 2, except that, in this embodiment 4, the zero position calibration process of the yaw twist cable angle is as follows: When the zero position reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count; specifically, preferably, in this embodiment, the preset parameter A is 24.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for detecting the yaw twist cable angle of a wind turbine generator set, characterized in that: The yaw cable angle of the wind turbine generator set is detected and calculated based on a single proximity switch sensor; wherein, during the operation of the wind turbine generator set, the proximity switch sensor obtains a high-low level conversion signal based on the identification position change of its corresponding yaw gear, and then calculates the yaw cable angle based on the high-low level conversion signal.

2. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 1, characterized in that: The outer periphery of the yaw gear is composed of tooth tops and tooth spaces that are alternately distributed, wherein the proximity switch sensor is installed on the outer periphery of the yaw gear.

3. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 2, characterized in that: The high-low level conversion signal obtained based on the change of the identification position of the corresponding yaw gear includes: during the operation of the wind turbine generator set, the yaw gear performs a clockwise or counterclockwise yaw rotation, and the corresponding identification position of the proximity switch sensor is changed between the tooth top and the tooth gap, so that the proximity switch sensor generates a corresponding high-low level alternating conversion signal.

4. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 3, characterized in that: The high and low level alternating conversion signals are used to determine whether the yaw gear is at a rising edge or a falling edge, and the yaw pulse calculation value is calculated based on the clockwise or counterclockwise yaw output signal output by the main control of the wind turbine generator set; wherein, When the yaw is clockwise: every time a rising edge or a falling edge appears, the yaw pulse calculation value is accumulated and calculated; When the yaw is counterclockwise: every time a rising edge or a falling edge appears, the yaw pulse calculation value is decremented.

5. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 1, 2, 3 or 4, characterized in that: The yaw pulse calculation value is defined as Count, the number of teeth of the yaw gear is defined as Pulses, and the yaw twist cable angle CableTwistAngle = 360 * Count / (Pulses * 2).

6. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 1, characterized in that: In order to avoid deviation in the calculation of the yaw twist cable angle, a zero position reset sensor is installed at the twist cable zero degree position of the yaw gear; wherein, the zero position reset sensor triggers a high level pulse signal every time the yaw gear rotates to this position, and the signal is used as a zero position reset signal, and the yaw twist cable angle is zero-calibrated based on the zero position reset signal.

7. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 6, characterized in that: The zero position calibration process of the yaw twist cable angle includes: The zero position pulse count is determined based on the number of full yaw rotations of the yaw gear. The zero position pulse count = the number of full yaw rotations of the yaw gear * Pulses * 2, where Pulses is the number of teeth of the yaw gear. When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count; when it is greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter, and when it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°. When it is less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°.

8. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 6, characterized in that: The zero position calibration process of the yaw twist cable angle includes: When the zero reset signal is triggered, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with the preset time parameter. When it is equal to or less than the preset time parameter B1, the yaw twist cable angle is calibrated to 0°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to 360°; when the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to 720°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw twist cable angle is calibrated to -360°; when the difference between the counterclockwise cumulative yaw time and the clockwise cumulative yaw time is greater than the preset time parameter B2, the yaw twist cable angle is calibrated to -720°.

9. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 6, characterized in that: The zero position calibration process of the yaw twist cable angle includes: When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero position pulse count is compared with the preset parameter A; when it is equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero position pulse count.

10. The method for detecting the yaw twist cable angle of a wind turbine generator set according to claim 7, 8 or 9, characterized in that: The preset parameter A is 22-25, preferably 24; the preset time parameter B1 is 11-13 minutes, more preferably 12 minutes; and the preset time parameter B2 is twice the preset time parameter B1.

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