Method and Device for Determining Clearance Value of Wind Turbine

Abstract

A method and apparatus for determining the clearance value of a wind turbine generator set are disclosed. The method includes: obtaining the current distance measurement value of the wind turbine generator set, wherein the current distance measurement value is the distance between the emission point of the measurement line emitted by the distance measuring device installed at the bottom of the nacelle and a predetermined point on the vertically downward blade, and the predetermined point is the first intersection point of the measurement line and the vertically downward blade; and determining the clearance value corresponding to the current distance measurement value based on the current distance measurement value and the correspondence between the distance measurement value and the clearance value.

Description

Technical Field

[0001] This disclosure generally relates to the field of wind power generation technology, and more specifically, to a method and apparatus for determining the headroom value of wind turbine generator sets. Background Technology

[0002] Currently, the clearance value of wind turbine generators is measured by emitting a vertically downward laser beam from a laser rangefinder installed at the bottom of the nacelle. During operation, if the blades bend significantly, they will touch the laser beam, exceeding the safe clearance threshold. This indicates the clearance value is too low, triggering an alarm and shutting down the wind turbine to ensure safe operation. However, this method only uses the safe clearance threshold as a threshold for protection; it determines shutdown based on whether the blades reach the threshold. It cannot precisely control the wind turbine based on changes in clearance value, such as preemptively controlling the turbine when the blades approach the safe clearance threshold to avoid shutdown. Summary of the Invention

[0003] The embodiments of this disclosure provide a method and apparatus for determining the airspace value of a wind turbine generator set, which can effectively solve the problem that the prior art cannot control the wind turbine generator set based on changes in the airspace value.

[0004] In one general aspect, a method for determining the clearance value of a wind turbine generator set is provided, comprising: obtaining the current ranging value of the wind turbine generator set, wherein the current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and the predetermined point on the vertically downward blade, the predetermined point being the first intersection point of the measuring line and the vertically downward blade; and determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value.

[0005] Optionally, before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the method further includes: acquiring operating data of the wind turbine generator set for a predetermined operating time, wherein the operating data includes the azimuth angle of the wind turbine generator set blades and the corresponding clearance value; acquiring the coordinates of the first intersection point of the edge line of the wind turbine generator set blades and the measurement line each time the blades are vertically downward based on the azimuth angle in the operating data, wherein the edge line is the edge line closest to the tower side when the blades are vertically downward; obtaining the ranging value of the blades each time they are vertically downward based on the coordinates of the first intersection point and the coordinates of the launch point of the measurement line; and determining the correspondence between the ranging value and the clearance value based on the ranging value of the blades each time they are vertically downward and the corresponding clearance value in the operating data.

[0006] Optionally, based on the azimuth angle in the operating data, the coordinates of the first intersection point between the edge line of the wind turbine blade and the measurement line are obtained, including: based on the azimuth angle in the operating data, obtaining the coordinates of the center of each cross section in multiple cross sections when the blade is vertically downward each time, wherein multiple cross sections are cross sections at different positions on the blade; when the blade is vertically downward each time, based on the coordinates of the center of each cross section of the currently vertically downward blade, obtaining the coordinates of the second intersection point between the edge line of the currently vertically downward blade and each cross section of the currently vertically downward blade; based on the coordinates of the two endpoints of the measurement line and the coordinates of the two endpoints of each line segment, obtaining the coordinates of the first intersection point between the edge line of the currently vertically downward blade and the measurement line, wherein the coordinates of the two endpoints of each line segment are the coordinates of the second intersection points corresponding to two adjacent cross sections in each cross section, and the coordinates of the two endpoints of the measurement line are the coordinates of the launch point and the coordinates of the intersection point of the measurement line and the ground, respectively.

[0007] Optionally, based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data, the correspondence between the distance measurement value and the clearance value is determined, including: determining a scatter plot of the distance measurement value and the clearance value based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data; and determining the correspondence between the distance measurement value and the clearance value based on the scatter plot of the distance measurement value and the clearance value.

[0008] Optionally, the correspondence between the distance value and the clearance value is determined based on the scatter plot of the distance value and the clearance value, including: smoothing the lower envelope of the scatter plot of the distance value and the clearance value; and determining the relationship between the distance value and the clearance value of the smoothed lower envelope as the correspondence between the distance value and the clearance value.

[0009] Optionally, after determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the method further includes: controlling the wind turbine generator based on the clearance value corresponding to the current ranging value.

[0010] Optionally, the wind turbine generator set is controlled based on the clearance value corresponding to the current ranging value, including: adjusting the blade pitch angle of the wind turbine generator set to increase the clearance value when the clearance value is less than a first threshold but greater than a safe clearance threshold, wherein the first threshold is greater than the safe clearance threshold; and controlling the wind turbine generator set to shut down when the clearance value is less than or equal to the safe clearance threshold.

[0011] In another general aspect, a wind turbine generator clearance value determination device is provided, comprising: an acquisition unit configured to acquire a current ranging value of the wind turbine generator, wherein the current ranging value is the distance between the emission point of a measuring line emitted by a ranging device installed at the bottom of the nacelle and a predetermined point on a vertically downward blade, the predetermined point being a first intersection point of the measuring line and the vertically downward blade; and a determination unit configured to determine a clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value.

[0012] Optionally, the determining unit is further configured to, before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, acquire operating data of the wind turbine generator set for a predetermined operating time, wherein the operating data includes the azimuth angle of the wind turbine generator set blades and the corresponding clearance value; based on the azimuth angle in the operating data, acquire the coordinates of the first intersection point of the edge line of the wind turbine generator set blades and the measurement line each time they are vertically downward, wherein the edge line is the edge line of the blades closest to the tower side when they are vertically downward; based on the coordinates of the first intersection point and the coordinates of the launch point of the measurement line, obtain the ranging value of the blades each time they are vertically downward; and based on the ranging value of the blades each time they are vertically downward and the corresponding clearance value in the operating data, determine the correspondence between the ranging value and the clearance value.

[0013] Optionally, the determining unit is further configured to obtain the coordinates of the center of each cross-section in multiple cross-sections when the blade is vertically downward each time, based on the azimuth angle in the running data, wherein the multiple cross-sections are cross-sections at different positions on the blade; when the blade is vertically downward each time, based on the coordinates of the center of each cross-section of the currently vertically downward blade, obtain the coordinates of the second intersection point between the edge line of the currently vertically downward blade and each cross-section of the currently vertically downward blade; based on the coordinates of the two endpoints of the measurement line and the coordinates of the two endpoints of each line segment, obtain the coordinates of the first intersection point between the edge line of the currently vertically downward blade and the measurement line, wherein the coordinates of the two endpoints of each line segment are the coordinates of the second intersection point corresponding to two adjacent cross-sections in each cross-section, and the coordinates of the two endpoints of the measurement line are the coordinates of the launch point and the coordinates of the intersection point of the measurement line and the ground, respectively.

[0014] Optionally, the determining unit is also configured to determine a scatter plot of distance value versus clearance value based on the distance value measured each time the blade moves vertically downward and the corresponding clearance value in the operating data; and to determine the correspondence between the distance value and the clearance value based on the scatter plot of distance value versus clearance value.

[0015] Optionally, the determining unit is further configured to smooth the lower envelope of the scatter plot of the distance value-cabinet value; and to determine the relationship between the distance value and the cabinet value of the smoothed lower envelope as the correspondence between the distance value and the cabinet value.

[0016] Optionally, the determining unit is further configured to, after determining the clearance value corresponding to the current distance value based on the current distance value and the correspondence between the distance value and the clearance value, control the wind turbine generator based on the clearance value corresponding to the current distance value.

[0017] Optionally, the determining unit is further configured to adjust the pitch angle of the wind turbine generator to increase the clearance value when the clearance value is less than a first threshold but greater than a safe clearance threshold, wherein the first threshold is greater than the safe clearance threshold; and to control the wind turbine generator to shut down when the clearance value is less than or equal to the safe clearance threshold.

[0018] In another general aspect, a computer-readable storage medium is provided for storing instructions, wherein when the instructions are executed by at least one computing device, they cause the at least one computing device to perform a method for determining the headroom value of any of the wind turbine generators described above.

[0019] In another general aspect, a system is provided that includes at least one computing device and at least one storage device for storing instructions, wherein the instructions, when executed by the at least one computing device, cause the at least one computing device to perform a method for determining the net clearance value of any of the wind turbine generators described above.

[0020] According to the wind turbine generator clearance value determination method and apparatus of the present disclosure, the current ranging value of the wind turbine generator is obtained. The current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward-facing blade. The predetermined point is the first intersection of the measuring line and the vertically downward-facing blade. Based on the current ranging value and the correspondence between the ranging value and the clearance value, the clearance value corresponding to the current ranging value is determined. That is, based on the predetermined correspondence between the ranging value and the clearance value and the real-time ranging value, the real-time clearance value can be obtained, thereby allowing for advance control of the wind turbine generator based on the real-time clearance value. Therefore, this disclosure effectively solves the problem that the prior art cannot control the wind turbine generator based on changes in the clearance value.

[0021] Further aspects and / or advantages of the general concept of this disclosure will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the general concept of this disclosure. Attached Figure Description

[0022] The above and other objects and features of the embodiments of this disclosure will become clearer from the following description taken in conjunction with the accompanying drawings illustrating the embodiments, wherein:

[0023] Figure 1 This is a flowchart illustrating a method for determining the airspace clearance of a wind turbine generator set according to an embodiment of the present disclosure;

[0024] Figure 2 This is a schematic diagram illustrating the installation information of a wind turbine generator set according to an embodiment of the present disclosure;

[0025] Figure 3 This is a scatter plot showing the distance and clearance values ​​of embodiments of the present disclosure;

[0026] Figure 4 This is a block diagram illustrating a headroom determination apparatus for a wind turbine generator set according to an embodiment of the present disclosure. Detailed Implementation

[0027] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0028] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0029] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0030] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0031] In the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains upon understanding this disclosure. Unless expressly defined herein, terms (such as those defined in a general dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this disclosure, and shall not be interpreted in an idealized or overly formalistic manner.

[0034] Furthermore, in the description of the examples, detailed descriptions of well-known related structures or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of this disclosure.

[0035] This disclosure provides a method and apparatus for determining the clearance value of a wind turbine generator set, which can solve the above-mentioned problems. The method for determining the clearance value of a wind turbine generator set disclosed herein can be applied to a field controller or a server. The field controller, server, and wind turbine generator set can be connected wirelessly or via a wired connection, without limitation. The server can be a single server, a server cluster consisting of several servers, a cloud computing platform, or a virtualization center. The following description uses a server as an example.

[0036] The server obtains the current ranging value of the wind turbine generator. This current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward-facing blade. The predetermined point is the first intersection of the measuring line and the vertically downward-facing blade. Based on the current ranging value and the correspondence between the ranging value and the clearance value, the corresponding clearance value is determined. In other words, by using the correspondence between the ranging value and the clearance value, and the real-time ranging value, the real-time clearance value can be obtained. Therefore, based on the real-time clearance value, the wind turbine generator can be controlled in advance.

[0037] The present disclosure will now be described in detail with reference to the accompanying drawings.

[0038] This disclosure proposes a method for determining the clearance value of a wind turbine generator set. Figure 1 This is a flowchart illustrating a method for determining the headroom value of a wind turbine generator set according to an embodiment of this disclosure. (Refer to...) Figure 1 The method for determining the airspace clearance of the wind turbine generator set includes the following steps:

[0039] In step S101, the current ranging value of the wind turbine generator is obtained. The current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward-facing blade. The predetermined point is the first intersection of the measuring line and the vertically downward-facing blade. The ranging device can be a laser ranging radar, a millimeter-wave radar, or other remote sensing ranging devices; this disclosure is not limited to any of these. The relationship between the ranging value, the ranging device, and the blade can be discussed in conjunction with… Figure 2 understand.

[0040] In step S102, based on the current ranging value and the correspondence between the ranging value and the clearance value, the clearance value corresponding to the current ranging value is determined. The correspondence between the ranging value and the clearance value can be predetermined.

[0041] According to embodiments of this disclosure, before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the following operations can be performed: Obtaining operational data of the wind turbine generator set for a predetermined operating time, wherein the operational data includes the azimuth angle of the wind turbine generator set blades and the corresponding clearance value; based on the azimuth angle in the operational data, obtaining the coordinates of the first intersection point of the edge line of the wind turbine generator set blades and the measurement line each time they are vertically downward, wherein the edge line is the edge of the blade closest to the tower side when it is vertically downward; obtaining the ranging value of the blade each time it is vertically downward based on the coordinates of the first intersection point and the coordinates of the launch point of the measurement line; determining the correspondence between the ranging value and the clearance value based on the ranging value of the blade each time it is vertically downward and the corresponding clearance value in the operational data. Through this embodiment, the correspondence between the ranging value and the clearance value can be determined conveniently and accurately.

[0042] Specifically, such as Figure 2As shown, a series of simulation conditions can be pre-set to simulate the possible clearance conditions of the wind turbine generator in the field as closely as possible. The blade deformation information under each clearance condition is obtained to confirm the intersection of the ranging device's measurement line and the blade, thus obtaining the ranging value L, and determining the relationship between the ranging value L and the blade clearance value C. In the simulation test, the blade deformation state under normal turbulent wind conditions, extreme wind direction changes, extreme wind shear, and steady wind conditions can all be encompassed by the extreme turbulent wind conditions. To obtain a smaller clearance value, a series of negative wind shears can be used. Therefore, a set of simulation conditions with different negative wind shears under ETM can well represent the possible deformation and position information of the blade during operation. The following simulation process is conducted under a set of simulation conditions with different negative wind shears under ETM.

[0043] First, the azimuth angle and corresponding clearance value of the wind turbine generator are collected at predetermined intervals over a certain period of time. The azimuth angle and the corresponding clearance value can be saved under a specific index. It should be noted that the clearance value can be obtained from the azimuth angle, and the method of acquisition is not limited in this disclosure. Second, since the azimuth angle (Rotor_azimuth_angle) can be used to determine when each blade is in a vertically downward passing position over the tower, for ease of understanding, this explanation uses a single blade as an example. The coordinates of the intersection point between the blade and the measurement line each time it passes the tower position can be obtained based on the azimuth angle. Figure 2 The intersection of the measurement line and the blade. Next, after obtaining the coordinates of the intersection point between the blade and the measurement line each time the blade passes the tower position, the distance L for each vertical downward movement of the blade can be obtained based on these intersection point coordinates and the coordinates of the launch point of the measurement line. The coordinates of the aforementioned launch point are... Figure 2 The coordinates of the endpoints of the measurement line emitted from the ranging device are shown. Specifically, the two endpoints of the measurement line can be determined based on the installation position and angle of the ranging device: the launch point B1 = [x_0, 0, z_0] and the point where the measurement line hits the ground B2 = [x_beam_ground, 0, 0]. The origin of this coordinate system is the center of the tower bottom. Then, based on the distance measurement value each time the blade moves vertically downwards and the corresponding clearance value saved above, the correspondence between the distance measurement value and the clearance value can be determined.

[0044] According to embodiments of this disclosure, obtaining the coordinates of the first intersection point between the edge line of a wind turbine blade and a measurement line based on the azimuth angle in the operating data can specifically include: obtaining the coordinates of the center of each cross-section in multiple cross-sections of the blade each time it is vertically downward, where the multiple cross-sections are cross-sections at different positions on the blade; obtaining the coordinates of the second intersection point between the edge line of the currently vertically downward blade and each cross-section of the currently vertically downward blade, based on the coordinates of the center of each cross-section of the currently vertically downward blade; obtaining the coordinates of the first intersection point between the edge line of the currently vertically downward blade and the measurement line based on the coordinates of the two endpoints of the measurement line and the two endpoints of each line segment, where the coordinates of the two endpoints of each line segment are the coordinates of the second intersection points corresponding to two adjacent cross-sections in each cross-section, and the coordinates of the two endpoints of the measurement line are the coordinates of the launch point and the coordinates of the intersection point of the measurement line and the ground, respectively. Through this embodiment, the non-linear blade is segmented into multiple segments, so each segment can be approximated as a straight line, thereby allowing for accurate determination of the coordinates of the first intersection point based on each straight line segment.

[0045] Specifically, taking a single blade as an example, we can first obtain the coordinates of the center of each of the blade's multiple cross-sections as it passes the tower position, based on the azimuth angle. These multiple cross-sections are the blade's horizontal cross-sections, and the distance between each cross-section is determined based on the blade's design and actual needs. Secondly, each time the blade moves vertically downwards, the intersection point with the measurement line is obtained, i.e., the first intersection point. The process of obtaining the first intersection point is illustrated below using a single vertical downward movement of the blade as an example. First, the coordinates of the intersection points of the blade's edge line and each cross-section (i.e., the coordinates of the second intersection point) are obtained. For the intersection point coordinates of each cross-section (iseg) and its edge line, the following formula can be used (only the formula corresponding to the X-axis is listed):

[0046] BladeX(iseg)=blade_x_position(iseg)+0.5*max(thickness(iseg)*cos(pitch_angle),chord(iseg)*sin(pitch_angle))

[0047] Where blade_x_position(iseg) is the coordinate of the center of a cross section of the blade, thickness(iseg) is the major axis of the ellipse of the cross section, chord(iseg) is the minor axis of the ellipse of the cross section, and pitch_angle is the pitch angle of the blade when it is vertically downward.

[0048] Each pair of adjacent cross sections can be divided into multiple segments along the edge line. Each segment can be approximated as a straight line. After obtaining the coordinates of the intersection point of each cross section's iseg and the edge line, the coordinates of the two endpoints of each straight line segment correspond to the coordinates of the intersection points of the two cross sections and the edge line. That is, the inner edge line of the blade near the tower side between each pair of cross sections can be regarded as a straight line segment with A1 and A2 as its two endpoints: A1 = [BladeX(iseg-1), 0, blade_z_position(iseg-1)]; A2 = [BladeX(iseg), 0, blade_z_position(iseg)]. Then, the coordinates of the intersection point of the measurement line and the inner edge line (i.e., the coordinates of the first intersection point mentioned above) can be obtained through each straight line segment. It should be noted that this intersection point must fall on one of the straight line segments mentioned above on the blade. The distance between this intersection point and B1 is the measurement value beam_length, and the clearance value at this moment is recorded.

[0049] According to embodiments of this disclosure, the step of determining the correspondence between the distance measurement value and the clearance value based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data can specifically include: determining a scatter plot of the distance measurement value and clearance value based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data; and determining the correspondence between the distance measurement value and the clearance value based on the scatter plot of the distance measurement value and the clearance value. Through this embodiment, a scatter plot is drawn based on the obtained distance measurement value and clearance value, so as to quickly and conveniently obtain the correspondence between the distance measurement value and the clearance value.

[0050] Specifically, after obtaining the distance measurement and clearance value each time the blade passes the tower position, a scatter plot of distance measurement value versus clearance value can be drawn, such as... Figure 3 As shown, the correspondence between the distance measurement value and the clearance value can be determined based on this scatter plot.

[0051] According to embodiments of this disclosure, the step of determining the correspondence between distance values ​​and clearance values ​​based on a scatter plot of distance values ​​and clearance values ​​may specifically include: smoothing the lower envelope of the scatter plot of distance values ​​and clearance values; and determining the relationship between the distance values ​​and clearance values ​​on the smoothed lower envelope as the correspondence between distance values ​​and clearance values. Through this embodiment, the minimum clearance value that may occur for the same distance value can be taken based on the lower envelope, thereby reducing the frequency of slurry adjustment.

[0052] Specifically, the lower envelope of the scatter plot can be smoothed to obtain the minimum clearance value that may occur under the same distance measurement. It should be noted that the difference between the upper and lower envelopes is significant. Using the lower envelope to estimate the clearance value can be overly conservative. That is, the minimum clearance value determined based on the lower envelope may cause damage to the wind turbine generator if the actual distance measurement has some error. Therefore, in practical applications, the scatter plot can be smoothed according to actual needs to obtain a reasonable correspondence between the distance measurement value and the clearance value.

[0053] According to embodiments of this disclosure, after determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the wind turbine generator can be controlled based on the clearance value corresponding to the current ranging value. Through this embodiment, the wind turbine generator can be controlled based on the real-time clearance value.

[0054] According to embodiments of this disclosure, the steps for controlling a wind turbine generator based on the clearance value corresponding to the current ranging value may specifically include: adjusting the blade pitch angle of the wind turbine generator to increase the clearance value when the clearance value is less than a first threshold but greater than a safe clearance threshold, wherein the first threshold is greater than the safe clearance threshold; and controlling the wind turbine generator to shut down when the clearance value is less than or equal to the safe clearance threshold. Through this embodiment, when the clearance value is close to the safe clearance threshold, the pitch can be adjusted in advance to increase the distance between the blades and the tower without shutting down the generator. The wind turbine generator is only shut down when the clearance value is less than or equal to the safe clearance threshold, thus reducing the frequency of wind turbine generator shutdowns.

[0055] In summary, this disclosure allows for the pre-determined correspondence between distance measurement values ​​and clearance values, enabling the determination of real-time clearance values ​​based on the distance measurement values ​​at each moment. This, in turn, allows for more precise control of the wind turbine generator based on the real-time clearance values. When the real-time clearance value is close to the safe clearance threshold, pitch adjustment can be implemented in advance without direct shutdown. Shutdown only occurs when the real-time clearance value is below the safe clearance threshold, thereby reducing the frequency of wind turbine generator shutdowns. It should be noted that for measurement systems with multiple measurement lines, calculating the clearance value separately based on the distance measurement values ​​of each line can yield a more refined correspondence between distance measurement values ​​and clearance values; however, this approach will also increase the hardware cost.

[0056] Figure 4 This is a block diagram illustrating a wind turbine generator headroom determination apparatus according to an embodiment of the present disclosure, such as... Figure 4 As shown, the device includes an acquisition unit 40 and a determination unit 42.

[0057] The acquisition unit 40 is configured to acquire the current ranging value of the wind turbine generator set, wherein the current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward blade, and the predetermined point is the first intersection point of the measuring line and the vertically downward blade. The determination unit 42 is configured to determine the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value.

[0058] According to an embodiment of this disclosure, the determining unit 42 is further configured to, before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, acquire operating data of the wind turbine generator set for a predetermined operating time, wherein the operating data includes the azimuth angle of the wind turbine generator set blades and the corresponding clearance value; based on the azimuth angle in the operating data, acquire the coordinates of the first intersection point of the edge line of the wind turbine generator set blades and the measurement line each time they are vertically downward, wherein the edge line is the edge line closest to the tower side when the blades are vertically downward; based on the coordinates of the first intersection point and the coordinates of the launch point of the measurement line, obtain the ranging value of the blades each time they are vertically downward; and based on the ranging value of the blades each time they are vertically downward and the corresponding clearance value in the operating data, determine the correspondence between the ranging value and the clearance value.

[0059] According to embodiments of this disclosure, the determining unit 42 is further configured to obtain the coordinates of the center of each cross section in a plurality of cross sections when the blade is vertically downward each time, based on the azimuth angle in the running data, wherein the plurality of cross sections are cross sections at different positions on the blade; when the blade is vertically downward each time, based on the coordinates of the center of each cross section of the currently vertically downward blade, obtain the coordinates of the second intersection point of the edge line of the currently vertically downward blade with each cross section of the currently vertically downward blade; based on the coordinates of the two endpoints of the measurement line and the coordinates of the two endpoints of each line segment, obtain the coordinates of the first intersection point of the edge line of the currently vertically downward blade with the measurement line, wherein the coordinates of the two endpoints of each line segment are the coordinates of the second intersection point corresponding to two adjacent cross sections in each cross section, and the coordinates of the two endpoints of the measurement line are the coordinates of the launch point and the coordinates of the intersection point of the measurement line and the ground, respectively.

[0060] According to an embodiment of this disclosure, the determining unit 42 is further configured to determine a scatter plot of distance value-cabinet value based on the distance value measured each time the blade moves vertically downward and the corresponding clearance value in the operating data; and to determine the correspondence between the distance value and the clearance value based on the scatter plot of distance value-cabinet value.

[0061] According to an embodiment of this disclosure, the determining unit 42 is further configured to smooth the lower envelope of the scatter plot of the distance value-cabin value; and to determine the relationship between the distance value and the cabin value of the smoothed lower envelope as the correspondence between the distance value and the cabin value.

[0062] According to an embodiment of this disclosure, the determining unit 42 is further configured to, after determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, control the wind turbine generator based on the clearance value corresponding to the current ranging value.

[0063] According to an embodiment of the present disclosure, the determining unit 42 is further configured to adjust the pitch angle of the wind turbine generator to increase the clearance value when the clearance value is less than a first threshold but greater than a safe clearance threshold, wherein the first threshold is greater than the safe clearance threshold; and to control the wind turbine generator to shut down when the clearance value is less than or equal to the safe clearance threshold.

[0064] According to embodiments of the present disclosure, a computer-readable storage medium for storing instructions is provided, wherein when the instructions are executed by at least one computing device, they cause the at least one computing device to perform a wind turbine generator headroom determination method as described in any of the above embodiments.

[0065] According to embodiments of the present disclosure, a system is provided that includes at least one computing device and at least one storage device storing instructions, wherein the instructions, when executed by at least one computing device, cause at least one computing device to perform a wind turbine generator headroom determination method as described in any of the above embodiments.

[0066] While some embodiments of this disclosure have been shown and described, those skilled in the art will understand that modifications may be made to these embodiments without departing from the principles and spirit of this disclosure, which are defined by the claims and their equivalents.

Claims

1. A method of determining a clearance value for a wind turbine, characterized by, include: Obtain the current ranging value of the wind turbine generator set, wherein the current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward blade, and the predetermined point is the first intersection point of the measuring line and the vertically downward blade; Based on the current ranging value and the correspondence between the ranging value and the clearance value, determine the clearance value corresponding to the current ranging value. Before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the method further includes: Obtain operating data of the wind turbine generator set for a predetermined operating time, wherein the operating data includes the azimuth angle of the blades of the wind turbine generator set and the corresponding clearance value; Based on the azimuth angle in the operating data, the coordinates of the first intersection point between the edge line of the wind turbine blade and the measurement line when the blade is vertically downward each time are obtained, wherein the edge line is the edge line closest to the tower side when the blade is vertically downward; Based on the coordinates of the first intersection point and the coordinates of the launch point of the measurement line, the distance measurement value is obtained each time the blade is vertically downward. Based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operation data, the correspondence between the distance measurement value and the clearance value is determined. The step of determining the correspondence between the distance measurement value and the clearance value based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data includes: Based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operation data, a scatter plot of distance measurement value-clearance value is determined. The correspondence between the distance measurement value and the clearance value is determined based on the scatter plot of the distance measurement value and the clearance value.

2. The headroom value determination method of claim 1, wherein, The step of obtaining the coordinates of the first intersection point between the edge line of the wind turbine blade and the measurement line based on the azimuth angle in the operating data includes: Based on the azimuth angle in the running data, the coordinates of the center of each cross section in multiple cross sections when the blade is vertically downward each time are obtained, wherein the multiple cross sections are cross sections at different positions on the blade; Each time the blade moves vertically downwards, based on the coordinates of the center of each section of the blade moving vertically downwards, the coordinates of the second intersection point between the edge line of the blade moving vertically downwards and each section of the blade moving vertically downwards are obtained. Based on the coordinates of the two endpoints of the measurement line and the coordinates of the two endpoints of each line segment, the coordinates of the first intersection point of the edge line of the currently vertically downward blade and the measurement line are obtained. The coordinates of the two endpoints of each line segment are the coordinates of the second intersection points of two adjacent sections in each section, and the coordinates of the two endpoints of the measurement line are the coordinates of the launch point and the coordinates of the intersection point of the measurement line and the ground.

3. The method for determining the airspace value as described in claim 1, characterized in that, Determining the correspondence between the distance measurement value and the clearance value based on the scatter plot of the distance measurement value and the clearance value includes: The lower envelope of the scatter plot of the distance value-clearance value is smoothed; The relationship between the distance measurement value and the clearance value of the smoothed lower envelope is determined as the correspondence between the distance measurement value and the clearance value.

4. The method for determining the airspace value as described in claim 1, characterized in that, After determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, the method further includes: The wind turbine generator set is controlled based on the clearance value corresponding to the current distance measurement value.

5. The method for determining the airspace value as described in claim 4, characterized in that, The control of the wind turbine generator based on the clearance value corresponding to the current ranging value includes: If the clearance value is less than the first threshold but greater than the safe clearance threshold, the blade pitch angle of the wind turbine generator is adjusted to increase the clearance value, wherein the first threshold is greater than the safe clearance threshold. If the clearance value is less than or equal to the safe clearance threshold, the wind turbine generator set shall be shut down.

6. A device for determining the clearance value of a wind turbine generator set, characterized in that, include: The acquisition unit is configured to acquire the current ranging value of the wind turbine generator set, wherein the current ranging value is the distance between the emission point of the measuring line emitted by the ranging device installed at the bottom of the nacelle and a predetermined point on the vertically downward blade, and the predetermined point is the first intersection point of the measuring line and the vertically downward blade. The determining unit is configured to determine the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value. The determining unit is further configured to, before determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, acquire operating data of the wind turbine generator set for a predetermined operating time, wherein the operating data includes the azimuth angle of the wind turbine generator set blades and the corresponding clearance value; based on the azimuth angle in the operating data, acquire the coordinates of the first intersection point of the edge line of the wind turbine generator set blades when vertically downward each time and the measuring line, wherein the edge line is the edge line of the blades closest to the tower side when vertically downward; based on the coordinates of the first intersection point and the coordinates of the launch point of the measuring line, obtain the ranging value of the blades when vertically downward each time; and based on the ranging value of the blades when vertically downward each time and the corresponding clearance value in the operating data, determine the correspondence between the ranging value and the clearance value. The determining unit is further configured to determine a scatter plot of distance value-cabinet value based on the distance measurement value when the blade is vertically downward each time and the corresponding clearance value in the operating data; and to determine the correspondence between the distance measurement value and the clearance value based on the scatter plot of distance value-cabinet value.

7. The airspace value determination device as described in claim 6, characterized in that, The determining unit is further configured to, based on the azimuth angle in the operating data, obtain the coordinates of the center of each cross-section in multiple cross-sections when the blade is vertically downward each time, wherein the multiple cross-sections are cross-sections at different positions on the blade; when the blade is vertically downward each time, based on the coordinates of the center of each cross-section of the currently vertically downward blade, obtain the coordinates of the second intersection point between the edge line of the currently vertically downward blade and each cross-section of the currently vertically downward blade; based on the coordinates of the two endpoints of the measuring line and the coordinates of the two endpoints of each line segment, obtain the coordinates of the first intersection point between the edge line of the currently vertically downward blade and the measuring line, wherein the coordinates of the two endpoints of each line segment are the coordinates of the second intersection point corresponding to two adjacent cross-sections in each cross-section, and the coordinates of the two endpoints of the measuring line are the coordinates of the launch point and the coordinates of the intersection point of the measuring line and the ground, respectively.

8. The airspace value determination device as described in claim 6, characterized in that, The determining unit is further configured to smooth the lower envelope of the scatter plot of the distance value-cabinet value; and to determine the relationship between the distance value and the cabinet value of the smoothed lower envelope as the correspondence between the distance value and the cabinet value.

9. The airspace value determination device as described in claim 6, characterized in that, The determining unit is further configured to, after determining the clearance value corresponding to the current ranging value based on the current ranging value and the correspondence between the ranging value and the clearance value, control the wind turbine generator set based on the clearance value corresponding to the current ranging value.

10. The airspace value determination device as described in claim 9, characterized in that, The determining unit is further configured to adjust the blade pitch angle of the wind turbine generator to increase the clearance value when the clearance value is less than a first threshold but greater than a safe clearance threshold, wherein the first threshold is greater than the safe clearance threshold; and to control the wind turbine generator to shut down when the clearance value is less than or equal to the safe clearance threshold.

11. A computer-readable storage medium for storing instructions, wherein, When the instruction is executed by at least one computing device, it causes the at least one computing device to perform the method for determining the airspace value of a wind turbine generator as described in any one of claims 1 to 5.

12. A system comprising at least one computing device and at least one storage device for storing instructions, wherein, When the instruction is executed by the at least one computing device, it causes the at least one computing device to perform the method for determining the airspace value of a wind turbine generator as described in any one of claims 1 to 5.

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