A yaw cable twist angle detection method for a wind turbine generator system

Abstract

The application discloses a yaw cable twisting angle detection method of a wind generating set, and detects and calculates the yaw cable twisting angle of the wind generating set based on a single proximity switch sensor; wherein, during the operation of the wind generating set, the proximity switch sensor obtains a high-low level conversion signal based on the recognition position transformation condition of the corresponding yaw gear, and then calculates the yaw cable twisting angle based on the high-low level conversion signal; the application not only obviously saves the hardware cost, but also eliminates the condition restriction of the higher requirement of the installation positions of two proximity switches, and is fast and convenient to install.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine generator sets, and specifically relates to a method for detecting the yaw torsion angle of a wind turbine generator set. Background Technology

[0002] The yaw system, as a crucial component of wind turbine generators, is fundamental to ensuring accurate wind alignment and maximizing wind energy utilization. The cable twist angle, a critical parameter of the yaw system, is essential not only for the precision of wind turbine yaw alignment but also for preventing the wind turbine's power cables from breaking and ensuring safe operation.

[0003] Existing wind turbine yaw systems typically use the high and low voltage levels generated by the relative distance between two proximity switches and the yaw gear of the wind turbine to determine the direction and angle of the yaw. This method not only requires two proximity switches, increasing costs, but also places high demands on the installation position of the two proximity switches to ensure that the generated high and low voltage levels are consistent with the theoretical design during on-site installation. Even a slight deviation will affect the accuracy of the cable twist angle calculation, thereby affecting the yaw control strategy and increasing the risk of cable breakage.

[0004] Therefore, the applicant seeks technical solutions to improve the above-mentioned technical problems. Summary of the Invention

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

[0006] Therefore, the technical solution adopted by the present invention is as follows:

[0007] A method for detecting the yaw twist angle of a wind turbine generator set, which uses a single proximity switch sensor to detect and calculate the yaw twist 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 identification position change of its corresponding yaw gear, and then calculates the yaw twist angle based on the high-low level conversion signal.

[0008] Preferably, the outer periphery of the yaw gear is composed of alternating tooth tips and tooth spaces, wherein the proximity switch sensor is mounted on the periphery of the yaw gear.

[0009] Preferably, the high-low level conversion signal is obtained based on the recognition position transformation of the yaw gear, and the high-low level conversion signal is obtained by the following method: during the operation of the wind turbine generator, the yaw gear rotates clockwise or counterclockwise, and the recognition position of the proximity switch sensor is transformed between the tooth top and the tooth gap, so that the proximity switch sensor generates a high-low level conversion signal.

[0010] Preferably, the high-low level conversion signal is obtained based on the recognition position transformation of the yaw gear, and the high-low level conversion signal is obtained by the following method: during the operation of the wind turbine generator, the yaw gear rotates clockwise or counterclockwise, and the recognition position of the proximity switch sensor is transformed between the tooth top and the tooth gap, so that the proximity switch sensor generates a high-low level conversion signal.

[0011] For clockwise yaw, the yaw pulse calculation value is calculated by adding operation every time the rising edge or the falling edge appears.

[0012] For counterclockwise yaw, the yaw pulse calculation value is calculated by decreasing operation every time the rising edge or the falling edge appears.

[0013] Preferably, the yaw pulse calculation value is defined as Count, and the number of teeth of the yaw gear is defined as Pulses, and the yaw cable twist angle CableTwistAngle = 360 * Count / (Pulses * 2).

[0014] Preferably, to avoid the deviation of the yaw cable twist angle calculation, a zero reset sensor is installed at the zero position of the yaw gear, and the zero reset sensor triggers a high level pulse signal every time the yaw gear rotates to the position, and the signal is used as a zero reset signal to calibrate the zero position of the yaw cable twist angle based on the zero reset signal.

[0015] Preferably, the zero calibration process of the yaw cable twist angle includes:

[0016] The zero calibration position pulse count is determined based on the number of complete rotations of the yaw gear, and the zero calibration position pulse count = the number of complete rotations of the yaw gear * Pulses * 2, wherein Pulses is the number of teeth of the yaw gear.

[0017] When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero calibration position pulse count is compared with a preset parameter A; wherein, when equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated as the zero calibration position pulse count; when greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with a preset time parameter, when equal to or less than the preset time parameter B1, the yaw cable angle is calibrated as 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 cable angle is calibrated as 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 cable angle is calibrated as 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 cable angle is calibrated as -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 cable angle is calibrated as -720°.

[0018] Preferably, the zero calibration process of the yaw cable angle comprises:

[0019] When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero calibration position pulse count is compared with a preset parameter A; wherein, when equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated as the zero calibration position pulse count.

[0020] Preferably, the zero calibration process of the yaw cable angle comprises:

[0021] When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero calibration position pulse count is compared with a preset parameter A; wherein, when equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated as the zero calibration position pulse count.

[0022] 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.

[0023] It should be noted that the proximity switch sensor involved in the present application can be selected from the existing known proximity switch sensor, and the present application does not have special restrictions thereon.

[0024] The present application uses one proximity switch sensor to realize the detection and calculation of the yaw cable twisting angle of the wind turbine generator, and compared with the existing detection method using two proximity switches, not only the hardware cost is significantly saved, but also the condition restriction of having high requirements for the installation positions of the two proximity switches is eliminated, and the installation is fast and convenient; the present application further provides a calibration method for the yaw cable twisting angle, and the detection accuracy and reliability of the present application are further improved, and the problem of inaccurate detection and calculation of the cable twisting angle caused by the yaw gear wear, poor meshing degree and other adverse conditions is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a distribution structure diagram of the yaw gear 1 (only as a shape diagram, and the number of teeth shown has nothing to do with the actual number of teeth in the embodiment) and the proximity switch sensor 2 in the specific embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiment of the present application discloses a yaw cable twisting angle detection method of a wind turbine generator, which detects and calculates the yaw cable twisting angle of the wind turbine generator based on a single proximity switch sensor; wherein, during the operation of the wind turbine generator, the proximity switch sensor obtains a high-low level conversion signal based on the recognition position transformation of the corresponding yaw gear, and then calculates the yaw cable twisting angle based on the high-low level conversion signal.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Embodiment 1: please refer to Figure 1 As shown in the figure, the embodiment provides a yaw cable twisting angle detection method of a wind turbine generator, which detects and calculates the yaw cable twisting angle of the wind turbine generator based on a single proximity switch sensor 2; preferably, in the present embodiment, the outer periphery of the yaw gear 1 is composed of tooth crests 1a and tooth spaces 1b which are alternately distributed, and the proximity switch sensor 2 is installed on the outer periphery of the yaw gear 1.

[0029] In the present embodiment, during the operation of the wind turbine, the proximity switch sensor 2 obtains a high-low level conversion signal based on the recognition position conversion of the corresponding yaw gear 1, and then calculates the yaw cable twist angle based on the high-low level conversion signal. Preferably, in the present embodiment, obtaining the high-low level conversion signal based on the recognition position conversion of the corresponding yaw gear 1 includes: during the operation of the wind turbine, the yaw gear 1 rotates clockwise or counterclockwise, the corresponding recognition position of the proximity switch sensor 2 is converted between the tooth top 1a and the tooth gap 1b, and then the proximity switch sensor 2 generates a high-low level alternating conversion signal.

[0030] Preferably, in the present embodiment, the rising edge or the falling edge of the yaw gear 1 is determined by the high-low level alternating conversion signal, 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. Specifically, in the present embodiment, the rising edge of the yaw gear 1 indicates that the proximity switch sensor 2 detects the tooth top 1a position, and the falling edge of the yaw gear 1 indicates that the proximity switch sensor 2 detects the tooth gap 1b position. Of course, in other embodiments, the rising edge of the yaw gear 1 can also be defined as indicating that the proximity switch sensor 2 detects the tooth gap 1b position, and the falling edge of the yaw gear 1 can be defined as indicating that the proximity switch sensor 2 detects the tooth top 1a position.

[0031] In the present embodiment, for clockwise yaw: whenever the rising edge or the falling edge appears, the yaw pulse calculation value is calculated by the cumulative operation; for counterclockwise yaw: whenever the rising edge or the falling edge appears, the yaw pulse calculation value is calculated by the decrement operation.

[0032] Preferably, in the present embodiment, the yaw pulse calculation value is defined as Count, the number of teeth of the yaw gear 1 is defined as Pulses, and the yaw cable twist angle CableTwistAngle = 360 * Count / (Pulses * 2).

[0033] Embodiment 2: The remaining technical solutions of the present embodiment 2 are the same as those of embodiment 1, and the difference lies in that, in the present embodiment 2, in order to avoid the deviation of the calculation of the yaw cable twist angle, a zero reset sensor is installed at the zero position of the yaw gear 1. The zero reset sensor triggers a high-level pulse signal whenever the yaw gear 1 rotates to the position, and the signal is used as a zero reset signal to calibrate the zero position of the yaw cable twist angle based on the zero reset signal.

[0034] Preferably, in the present embodiment, the zero calibration process of the yaw cable twist angle is as follows:

[0035] The zero calibration pulse count is determined based on the number of whole turns of the yaw gear 1, and the zero calibration pulse count = number of whole turns of the yaw gear 1 * Pulses * 2, wherein Pulses is the number of teeth of the yaw gear 1;

[0036] When the zero reset signal is triggered, the difference between the yaw pulse calculation value Count and the zero calibration pulse count is compared with a preset parameter A; wherein, when equal to or less than the preset parameter A, the yaw pulse calculation value Count is calibrated to the zero calibration pulse count; when greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with a preset time parameter, when equal to or less than the preset time parameter B1, the yaw cable twist 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 cable twist 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 cable twist 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 cable twist 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 cable twist angle is calibrated to -720°.

[0037] It should be particularly noted that the skilled person 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 the actual engineering case, and the present application does not make a unique limitation thereto;

[0038] Preferably, in the present 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 the present embodiment, the preset parameter A is 24, the preset time parameter B1 is 12 minutes, and the preset time parameter B2 is 24 minutes.

[0039] In combination with the present embodiment 2, the setting of the preset parameter A and the preset time parameter B1 is further explained:

[0040] The preset parameter A is set according to the principle of yaw reset zero and combined with actual engineering experience. The deviation of the cable twisting angle is generally not greater than 90° after each rotation of the yaw, so an angle value between 0° and 90° is selected. In this embodiment, 30.7° is specifically selected, and the number of yaw teeth in this embodiment is 141. The angle of one rotation of the yaw tooth disc is 360°, and the corresponding accumulated pulse number is twice the number of yaw teeth, that is, 282. Therefore, the accumulated pulse number corresponding to 30.7° is 30.7° / (360° / 282)=24, which is taken as the value of the preset parameter A.

[0041] The preset time parameter B1 is set according to the statistical value that the time for one normal yaw of the fan in this actual application case is about 15 minutes. Therefore, the preset time parameter B1 is set to 12 minutes.

[0042] In this embodiment 3, the zero position calibration process of the yaw cable twisting angle is as follows:

[0043] When the zero position reset signal is triggered, the difference between the clockwise accumulated yaw time and the counterclockwise accumulated yaw time is compared with the preset time parameter. When the difference is equal to or less than the preset time parameter B1, the yaw cable twisting angle is calibrated to 0°. When the difference between the clockwise accumulated yaw time and the counterclockwise accumulated yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw cable twisting angle is calibrated to 360°. When the difference between the clockwise accumulated yaw time and the counterclockwise accumulated yaw time is greater than the preset time parameter B2, the yaw cable twisting angle is calibrated to 720°. When the difference between the counterclockwise accumulated yaw time and the clockwise accumulated yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw cable twisting angle is calibrated to -360°. When the difference between the counterclockwise accumulated yaw time and the clockwise accumulated yaw time is greater than the preset time parameter B2, the yaw cable twisting angle is calibrated to -720°. Specifically, in this embodiment, the preset time parameter B1 is 12 minutes, and the preset time parameter B2 is 24 minutes.

[0044] In this embodiment 4, the zero position calibration process of the yaw cable twisting angle is as follows:

[0045] 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 the difference 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, in this embodiment, the preset parameter A is 24.

[0046] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0047] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A method for detecting the yaw torsion angle of a wind turbine generator set, characterized in that, The yaw cable twist angle of the wind turbine is detected and calculated based on a single proximity switch sensor. During the operation of the wind turbine, the proximity switch sensor obtains a high-low level transition signal based on the change in the identification position of its corresponding yaw gear, and then calculates the yaw cable twist angle based on the high-low level transition signal. The yaw pulse calculation value is defined as Count, the number of teeth of the yaw gear is defined as Pulses, and the yaw cable twist angle CableTwistAngle = 360 * Count / (Pulses * 2). To avoid errors in the calculation of the yaw twist angle, a zero-position reset sensor is installed at the zero-degree position of the yaw gear's twist angle. This zero-position reset sensor triggers a high-level pulse signal whenever the yaw gear rotates to this position. This signal is used as the zero-position reset signal, and the yaw twist angle is zero-position calibrated based on this zero-position reset signal. The zero-point calibration process for the yaw twist 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 = 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-position reset signal is triggered, the difference between the calculated yaw pulse value Count and the zero-position pulse count is compared with a preset parameter A. If the difference is equal to or less than the preset parameter A, the calculated yaw pulse value Count is calibrated to the zero-position pulse count. If the difference is greater than the preset parameter A, the difference between the clockwise cumulative yaw time and the counterclockwise cumulative yaw time is compared with a preset time parameter B1. If the difference is equal to or less than the preset time parameter B1, the yaw twist angle is calibrated to 0°. When the time difference is less than the preset time parameter B2, the yaw cable angle is calibrated to 360°; when the difference between the cumulative clockwise yaw time and the cumulative counterclockwise yaw time is greater than the preset time parameter B2, the yaw cable angle is calibrated to 720°; when the difference between the cumulative counterclockwise yaw time and the cumulative clockwise yaw time is greater than the preset time parameter B1 and equal to or less than the preset time parameter B2, the yaw cable angle is calibrated to -360°; when the difference between the cumulative counterclockwise yaw time and the cumulative clockwise yaw time is greater than the preset time parameter B2, the yaw cable angle is calibrated to -720°.

2. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 1, characterized in that, The outer periphery of the yaw gear is composed of alternating tooth tips and tooth spaces, wherein the proximity switch sensor is mounted on the periphery of the yaw gear.

3. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 2, characterized in that, The high and low level conversion signal obtained based on the identification position change of the corresponding yaw gear includes: during the operation of the wind turbine generator set, the yaw gear rotates clockwise or counterclockwise, and the identification position of the proximity switch sensor changes between the tooth tip and the tooth gap, thereby causing the proximity switch sensor to generate a high and low level alternating signal.

4. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 3, characterized in that, The alternating high and low level signals are used to determine whether the yaw gear is on a rising or falling edge, and the yaw pulse value is calculated based on the clockwise or counterclockwise yaw output signal from the wind turbine main control unit; wherein... For clockwise yaw: whenever a rising or falling edge occurs, the calculated yaw pulse value is accumulated. For counter-clockwise yaw: Whenever a rising or falling edge occurs, the calculated yaw pulse value is decremented.

5. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 1, characterized in that, The preset parameter A is 22-25 minutes; the preset time parameter B1 is 11-13 minutes; and the preset time parameter B2 is twice the preset time parameter B1.

6. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 5, characterized in that, The default parameter A is 24.

7. The method for detecting the yaw torsion angle of a wind turbine generator set according to claim 5, characterized in that, The preset time parameter B1 is 12 minutes.

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