Pitch control method, device, equipment and storage medium for wind turbine generator set

Abstract

The present invention discloses a variable pitch control method, device, equipment and computer-readable storage medium for a wind turbine generator set, the method comprising: collecting the tip clearance value of the wind turbine generator set and determining whether the tip clearance value is greater than the warning value, if so, detecting and obtaining the current wind speed corresponding to the wind turbine generator set within a preset distance interval; determining whether the current wind speed reaches the warning wind speed, if so, detecting and obtaining the current wind shear corresponding to the position within the preset distance interval; determining the current variable pitch angle of the wind turbine generator set according to the current wind shear and the predetermined correspondence between the wind shear and the variable pitch angle. In this application, subsequent wind field conditions can be predicted, avoiding the problem of being unable to take timely measures to deal with the blade tip sweeping tower in extreme wind field conditions, and improving the safety of the wind turbine generator set to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a variable pitch control method, device, equipment and computer-readable storage medium for a wind generator set. Background Art

[0002] Wind is one of the non-polluting energy sources. Wind turbines use wind power to drive the blades to rotate, which in turn drives the generator to generate electricity. With the development of wind power generation technology, lengthening traditional wind turbine blades is a better optimization direction to improve wind turbine power generation efficiency. However, at the same time, lengthening the blades will also increase the blade disturbance, thereby increasing the risk of blade tip sweeping the tower.

[0003] At present, in order to avoid the problem of blade tip sweeping the tower, it is mainly achieved by detecting the blade tip clearance value, that is, detecting the minimum distance between the blade tip and the tower. If the blade tip is controlled to be less than the set threshold, corresponding protection measures are taken to ensure the safety of the wind turbine. However, this monitoring method cannot completely guarantee the safety of the wind turbine. Summary of the invention

[0004] The object of the present invention is to provide a pitch control method, device, equipment and computer-readable storage medium for a wind turbine generator set, which can reduce the risk of blade tip sweeping the tower to a certain extent.

[0005] In order to solve the above technical problems, the present invention provides a variable pitch control method of a wind turbine generator set, comprising:

[0006] Collecting the tip clearance value of the wind turbine generator set and determining whether the tip clearance value is greater than the warning value, and if so, detecting and obtaining the current wind speed corresponding to the wind turbine generator set within a preset distance interval;

[0007] Determine whether the current wind speed reaches the warning wind speed, and if so, detect and obtain the current wind shear corresponding to the position within the preset distance interval;

[0008] The current pitch angle of the wind turbine generator set is determined according to the current wind shear and a predetermined corresponding relationship between the wind shear and the pitch angle.

[0009] Optionally, detecting and obtaining a current wind shear corresponding to a position within the preset distance interval includes:

[0010] The wind shear corresponding to each of the n wind measuring points within the preset distance interval is obtained by using a laser radar; wherein the laser radar is arranged on the wind turbine generator set;

[0011] Performing linear fitting on the n wind shears and the corresponding distances between the wind measuring points and the laser radar, and determining the wind shear parameter a in the linear fitting relationship y=a+bx; wherein y is the fitted wind shear corresponding to the wind measuring point at a distance x from the laser radar, and b is the slope parameter;

[0012] The minimum value of the wind shear parameter a and the wind shear corresponding to the first wind measuring point is compared and selected as the current wind shear; wherein the first wind measuring point is the wind measuring point closest to the blade among the n wind measuring points.

[0013] Optionally, using a laser radar to measure and obtain wind shears corresponding to n wind measurement points within the preset distance interval includes:

[0014] The upper plane wind speed and the lower plane wind speed are measured by using the laser radar, wherein the upper plane wind speed and the lower plane wind speed are wind speeds of the upper plane and the lower plane respectively, which have pitch angles equal to and opposite to the horizontal plane, and the laser radar is located at the intersection of the upper plane and the lower plane;

[0015] Using the wind shear formula Determine the wind shear corresponding to each wind measurement point; where v hi is the upper plane wind speed at the i-th wind measurement point, v li is the upper plane wind speed of the i-th wind measurement point, i∈1,2,3,…,n, x i is the distance from the ith wind measurement point to the laser radar, H is the height of the laser radar, and θ is the pitch angle.

[0016] Optionally, detecting and obtaining a current wind speed corresponding to a preset distance interval from the wind turbine generator set includes:

[0017] Using laser radar to measure and obtain the wind speeds corresponding to the n wind measurement points within the preset distance interval;

[0018] The wind speed corresponding to the first wind measuring point is taken as the current first wind speed, and the average wind speed of the n crosswind points is taken as the current second wind speed;

[0019] Accordingly, judging whether the current wind speed reaches the warning wind speed includes:

[0020] It is determined whether at least one of the current first wind speed and the current second wind speed reaches the warning wind speed.

[0021] Optionally, the process of setting the positions of the n wind measurement points includes:

[0022] Let the arithmetic sequence {k(1), k(2), …, k(n)} satisfy: e k(1) =x1,ek(i) =x i , e k(n) =x n ; Wherein, x1 is equal to the distance between the starting boundary point of the preset distance interval and the laser radar, x n Equal to the distance between the end boundary point of the preset distance interval and the laser radar;

[0023] According to the arithmetic relationship between the elements in the arithmetic sequence {k(1), k(2), ..., k(n)}, x1, x n , determine the distance between each of the wind measurement points and the laser radar.

[0024] Optionally, determining whether the current wind speed reaches the warning wind speed includes:

[0025] Determine whether the current wind speed is greater than the first warning wind speed and less than the second warning wind speed;

[0026] If not, keeping the pitch angle of the wind turbine generator set unchanged;

[0027] If yes, then executing the step of detecting and obtaining the current wind shear corresponding to the position within the preset distance interval;

[0028] The first warning wind speed is less than the rated wind speed, and the second warning wind speed is greater than the rated wind speed, and the rated wind speed is the wind speed corresponding to the rated rotation speed of the wind turbine generator set.

[0029] A variable pitch control device for a wind turbine generator set, comprising:

[0030] A wind speed detection module is used to collect the blade tip clearance value of the wind turbine generator set and determine whether the blade tip clearance value is greater than the warning value. If so, the current wind speed corresponding to the wind turbine generator set within a preset distance interval is detected and obtained;

[0031] A wind shear module, used to determine whether the current wind speed reaches the warning wind speed, and if so, to detect and obtain the current wind shear corresponding to the position within the preset distance interval;

[0032] The pitch angle module is used to determine the pitch angle of the wind turbine generator set according to the current wind shear.

[0033] Optionally, the wind shear module includes:

[0034] A single-point wind shear unit, used to obtain wind shears corresponding to n wind measuring points within the preset distance interval by using a laser radar; wherein the laser radar is arranged on the wind turbine generator set;

[0035] A shear parameter unit, used to perform linear fitting on the n wind shears and the corresponding distances between the wind measuring points and the laser radar, and determine the wind shear parameter a in the linear fitting relationship y=a+bx; wherein y is the fitted wind shear corresponding to the wind measuring point at a distance x from the laser radar, and b is a slope parameter;

[0036] The wind shear comparison unit is used to compare and select the data with the smallest absolute value between the wind shear parameter a and the wind shear corresponding to the first wind measuring point as the current wind shear; wherein the first wind measuring point is the wind measuring point closest to the blade among the n wind measuring points.

[0037] A variable pitch control device for a wind turbine generator set, comprising:

[0038] Memory for storing computer programs;

[0039] A processor is used to implement the steps of the variable pitch control method for a wind turbine generator set as described in any one of the above items when executing the computer program.

[0040] A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the variable pitch control method for a wind turbine generator set as described in any one of the above items.

[0041] The pitch control method of a wind turbine generator set provided by the present invention includes: collecting the blade tip clearance value of the wind turbine generator set and determining whether the blade tip clearance value is greater than a warning value, and if so, detecting and obtaining the current wind speed corresponding to the wind turbine generator set within a preset distance interval; determining whether the current wind speed reaches the warning wind speed, and if so, detecting and obtaining the current wind shear corresponding to the position within the preset distance interval; and determining the current pitch angle of the wind turbine generator set based on the current wind shear and a predetermined correspondence between the wind shear and the pitch angle.

[0042] Under the condition that the tip clearance value is greater than the warning value, the present application further detects the wind speed within a certain distance range from the wind turbine generator set, which is equivalent to predicting the wind speed that will blow towards the blades, thereby making a certain estimate of the risk of the wind turbine blade tip sweeping the tower. On the basis that the wind speed reaches a certain threshold, the impact of wind shear on the wind turbine blade tip sweeping the tower is fully considered, and the wind shear size within the interval where the wind speed reaches the corresponding threshold is further detected, and the pitch angle of the wind turbine blade is adjusted based on the wind shear. It can be seen that the present application can make a certain prediction of the subsequent wind field conditions, and then take countermeasures to deal with the problem of blade tip sweeping the tower in advance, thereby avoiding the problem of blade tip sweeping the tower caused by the sudden increase of blade winding in extreme wind field conditions and the inability to take countermeasures in time, thereby improving the safety of wind turbine generator sets to a certain extent.

[0043] The present application also discloses a pitch control device, equipment and computer-readable storage medium for a wind turbine generator set, which have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 is a schematic diagram of a wind turbine generator set;

[0046] Figure 2 A schematic diagram of a flow chart of a pitch control method for a wind turbine generator set provided in an embodiment of the present application;

[0047] Figure 3 It is a schematic diagram of the relationship between wind speed and blade tip clearance value;

[0048] Figure 4 A schematic diagram of the locations of various wind measurement points provided in an embodiment of the present application;

[0049] Figure 5 A schematic diagram of laser radar wind shear measurement according to an embodiment of the present application;

[0050] Figure 6 This is a structural block diagram of a pitch control device for a wind turbine generator set provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] Reference Figure 1 , Figure 1It is a schematic diagram of a wind turbine generator set; a downward detecting laser 2 is arranged on the wind turbine generator set 1, and the laser 2 emits two laser beams at different distances from the tower 3. When the bending angle of the blade 4 increases and causes the blade tip to block the warning laser, an alarm is issued, and when the bending angle of the blade 4 continues to increase and causes the blade tip to block the alarm laser, protective measures are initiated, such as adjusting the pitch of the blade 4 to reduce the wind force borne by the blade 4, thereby improving its curvature.

[0053] However, in actual application, especially in extreme wind farm environments, the time from when the blade tip blocks the warning laser to when it blocks the alarm laser may be basically zero. That is to say, the bending degree of the blade suddenly increases sharply, causing the blade tip to directly sweep the tower before pitch adjustment is performed, thereby causing damage to the wind turbine.

[0054] To this end, the present application further considers predicting the future wind farm of the wind turbine, thereby predicting in advance whether there is a tower sweep risk, so as to take corresponding measures in advance.

[0055] refer to Figure 2 , Figure 2 A flow chart of a pitch control method for a wind turbine generator set provided in an embodiment of the present application, the method may include:

[0056] S11: Collect the tip clearance value of the wind turbine.

[0057] S12: Determine whether the blade tip clearance value is greater than the warning value. If so, enter S13; if not, control the pitch angle adjustment.

[0058] The method of adjusting the pitch angle based on the blade tip clearance value can refer to the conventional implementation method of avoiding blade tip sweep based on the blade tip clearance value, which will not be described in detail in this application.

[0059] S13: Detect and obtain the current wind speed corresponding to the wind turbine generator set within a preset distance interval.

[0060] The preset distance interval is an interval within a space in front of the wind turbine blades. Obviously, the wind field within the preset distance interval is also the wind field that will blow toward the wind turbine blades later.

[0061] The wind speed within the preset interval can be detected by laser radar, which is one of the conventional wind speed measuring devices. The laser radar is set on the nacelle of the wind turbine and emits laser radar signals to the preset distance interval before the blades, so as to realize the wind speed detection.

[0062] S14: Determine whether the current wind speed reaches the warning wind speed. If so, enter S15. If not, keep the pitch angle unchanged.

[0063] It should be noted that the warning wind speed should be close to the rated wind speed of the wind turbine generator set, which is the wind speed that makes the generator speed reach the rated speed. Figure 3 , Figure 3 Schematic diagram of the relationship between wind speed and blade tip clearance value. Figure 3 The horizontal axis is the wind speed, the vertical axis is the clearance value, and the wind turbine generator set with a rated wind speed of 10m / s is used as an example for explanation. Figure 3 It can be seen that when the wind speed is less than the rated wind speed, the clearance value gradually decreases as the wind speed increases; when the wind speed is less than the rated wind speed, the clearance value gradually decreases as the wind speed increases. That is to say, when the wind speed is near the rated wind speed, the clearance value is the smallest. To this end, in an optional embodiment of the present application, the process of comparing and judging the wind speed and the warning wind speed can further include:

[0064] Determine whether the current wind speed is greater than the first warning wind speed and less than the second warning wind speed;

[0065] If not, the pitch angle of the wind turbine generator set is kept unchanged;

[0066] If yes, the step of obtaining the current wind shear corresponding to the preset distance interval from the plane where the blade is located according to the detection is performed;

[0067] Among them, the first warning wind speed is less than the rated wind speed, and the second warning wind speed is greater than the rated wind speed. The rated wind speed is the wind speed corresponding to the rated rotation speed of the wind turbine generator set.

[0068] That is to say, a warning wind speed range can be set. If the current wind speed is within the warning wind speed range, it means that the blade tip clearance may be reduced to a smaller value, so the problem of blade sweeping the tower needs to be considered. Otherwise, there is no need to consider the problem of blade tip sweeping the tower.

[0069] The size of the interval formed by the first warning wind speed and the second warning wind speed can be based on something like Figure 3 The relationship shown is determined, and no specific limitation is made in this application.

[0070] Of course, in actual application, it is not ruled out that only a warning threshold less than the rated wind speed is set. When the current wind speed is greater than the warning threshold, the problem of blade tip sweeping the tower needs to be considered. Otherwise, the blade pitch angle can be kept unchanged.

[0071] S15: Detect and obtain the current wind shear corresponding to the position within the preset distance interval.

[0072] This embodiment further considers that the wind speed is not the only factor that determines whether the blade tip will sweep the tower. For example, when the wind blowing toward the blade is within the plane of rotation of the blade, in the upper part (there is no tower behind the blade), the blade will not sweep the tower even if it bends. Therefore, this embodiment further predicts the current wind shear corresponding to the preset distance interval before the blade.

[0073] Wind shear reflects a parameter that changes as wind speed changes with height. It can more accurately determine which part of the wind field that subsequently blows toward the blades has a higher wind speed, and thus more accurately determine whether there is a risk of the blade tip sweeping the tower.

[0074] Obviously, wind shear is a coefficient related to wind speed. In practical applications, the wind speed can be measured by lidar to determine the amount of wind shear.

[0075] S16: Determine a current pitch angle of the wind turbine generator set according to the current wind shear and a predetermined correspondence between the wind shear and the pitch angle.

[0076] As mentioned above, when the wind speed in the lower half of the plane where the blades are located in the wind field blowing towards the blades is high, and the wind speed in the upper half is low, it is more likely to cause tower sweeping. Wind shear is a parameter that characterizes the amplitude of wind speed change in the vertical direction of the wind field. If the current wind shear is positive, it means that the greater the height in the wind field, the greater the wind speed, and vice versa, the smaller the height, the smaller the wind speed. At this time, it is obviously not necessary to adjust the pitch angle of the wind turbine generator set. Therefore, the corresponding pitch angles can remain unchanged at this time. However, when the wind shear is negative, which is the extreme case that this application focuses on, the smaller the wind shear (the larger the absolute value), the larger the current pitch angle.

[0077] As for the correspondence between wind shear and pitch angle, the relationship between wind shear and blade tip sweeping the tower can be determined based on multiple tests, and then the relationship between wind shear and pitch angle can be determined. This application will not go into detail.

[0078] To summarize, in the present application, on the basis that the blade tip clearance value is insufficient for pitch adjustment, the subsequent wind field blowing toward the blades is further detected, and when the subsequent wind speed reaches a certain warning value, the wind shear of the subsequent wind field blowing toward the blades is further predicted, so as to more accurately predict whether there is a risk of blade sweeping the tower in the future, thereby being able to take protective measures against blade tip sweeping the tower earlier, having a strong ability to deal with safety issues caused by extreme wind fields, and being conducive to ensuring the safe and stable operation of wind turbines.

[0079] Based on any of the above embodiments, the process of measuring the wind speed and wind shear within a preset distance interval in the above embodiments is introduced below. In an optional embodiment of the present application, the process of determining the wind speed within a distance interval at a certain distance from the wind turbine generator set may include:

[0080] The laser radar is used to measure and obtain the wind speed corresponding to n wind measuring points within a preset distance interval;

[0081] The wind speed corresponding to the first wind measuring point is taken as the current first wind speed, and the average wind speed of n crosswind points is taken as the current second wind speed;

[0082] Accordingly, judging whether the current wind speed reaches the warning wind speed includes:

[0083] It is determined whether at least one of the current first wind speed and the current second wind speed reaches the warning wind speed.

[0084] It is understandable that the first wind measuring point is also the wind measuring point closest to the wind turbine generator set. In this implementation, based on the average wind speed within the preset distance interval, in addition to comparing the average wind speed with the warning wind speed, the wind speed of the wind measuring point closest to the wind turbine generator set is further compared and judged; obviously, the wind measuring point closest to the wind turbine generator set is also the wind speed that blows toward the blades first. At the same time, comparing the wind speed of the first wind measuring point with the average wind speed and the warning wind speed is conducive to improving the accuracy of the subsequent control of the pitch angle, thereby improving the safety of the wind turbine generator set.

[0085] In addition, if the warning wind speed compared with the average wind speed and the wind speed at the first measurement point is in a warning wind speed interval, then if one of the two wind speed data is within the warning wind speed interval, it can be considered that the current wind speed has reached the warning wind speed.

[0086] For the above-mentioned setting method of wind measurement points, n equally spaced wind measurement points may be continuously set within a preset distance interval. However, in this embodiment, it is further considered that the closer the position is to the wind turbine generator set, the greater the influence on the bending of subsequent wind turbine blades. Therefore, in an optional embodiment of the present application, the process of setting n measurement points within a preset distance interval may include:

[0087] Let the arithmetic sequence {k(1), k(2), …, k(n)} satisfy: e k(1) =x1,e k(i) =x i , e k(n) =x n ; where x1 is equal to the distance between the starting boundary point of the preset distance interval and the laser radar, x n Equal to the distance between the end boundary point of the preset distance interval and the laser radar;

[0088] According to the arithmetic relationship between the elements in the arithmetic sequence {k(1), k(2),…, k(n)}, x1, x n , determine the distance between each wind measurement point and the lidar.

[0089] It is understandable that the starting boundary point of the preset distance interval is the point in the preset distance interval closest to the wind turbine generator set, and the ending boundary point is the point farthest from the wind turbine generator set. It should be further explained that the laser radar is arranged on the wind turbine generator set, so in this embodiment, the distance difference between the laser radar and the wind turbine generator set is regarded as 0, that is, the distance between each wind measuring point and the laser radar is also the distance between the wind measuring point and the wind turbine generator set. This is the same in each embodiment of this application and will not be described in detail later.

[0090] Reference Figure 4 , Figure 4 The horizontal coordinate is the serial number of each wind measurement point, and the vertical coordinate is the distance between each wind measurement point and the laser radar. Figure 4 In the example, n=10, the distance between the first wind measuring point and the laser radar is 50m, and the distance between the last wind measuring point and the laser radar is 200m, which means that the preset distance interval is from 50m to 200m from the laser radar. Figure 4 It can be clearly determined that, in this embodiment, the closer to the laser radar, the smaller the spacing between the wind measurement points, and conversely, the farther away from the laser radar, the larger the spacing between the wind measurement points. As a result, the wind measurement points close to the laser radar have a greater influence on the average wind speed in the final calculation of the wind measurement point positions determined based on the method in this embodiment, which is conducive to more accurately determining whether subsequent pitch adjustment is required.

[0091] Based on any of the above embodiments, on the basis that the current wind speed reaches the warning wind speed, it is necessary to further calculate the wind shear. In an optional embodiment of the present application, the process of determining the current wind shear corresponding to the preset distance interval may include:

[0092] S151: Using laser radar to measure and obtain the wind shear corresponding to n wind measuring points within a preset distance interval.

[0093] It should be noted that the setting method of the n wind measuring points can be exactly the same as the method of positioning the wind measuring points for the above-mentioned wind speed measurement setting. N equally spaced wind measuring points can be selected completely within the preset distance interval, or n wind measuring points can be selected according to the natural index in the above-mentioned embodiment. In this regard, this embodiment does not impose too many restrictions.

[0094] Optionally, the wind shear measurement method for each wind measuring point may include:

[0095] The upper plane wind speed and the lower plane wind speed are measured by laser radar, where the upper plane wind speed and the lower plane wind speed are the wind speeds of the upper plane and the lower plane respectively, which are equal to the pitch angle of the horizontal plane and opposite in direction, and the laser radar is located at the intersection of the upper plane and the lower plane;

[0096] Using the wind shear formula Determine the wind shear corresponding to each wind measurement point; where v hi is the upper plane wind speed at the i-th wind measuring point, v li is the upper plane wind speed at the i-th wind measuring point, i∈1,2,3,…,n, x i is the distance from the ith wind measurement point to the laser radar, H is the height of the laser radar, that is, the height of the laser radar from the ground, and θ is the pitch angle.

[0097] Reference Figure 5 , Figure 5 Schematic diagram of laser radar wind shear measurement in the embodiment of the present application. Point O is the location of the laser radar. Taking the laser radar outputting four laser signals n1, n2, n3, and n4 as an example, the beams n1 and n2 are respectively at the measuring point x i The average wind speed measured on the vertical plane (vertical plane perpendicular to the x-axis) is the upper plane wind speed v of the i-th wind measuring point. hi ; Beam n3 and beam n4 are respectively at the measurement point x i The average wind speed measured on the vertical plane is the wind speed v below the i-th wind measuring point. li ; and the pitch angle between the plane where the beams n1 and n2 are located and the horizontal plane (the plane formed by the x-axis and the y-axis) is θ, while the pitch angle between the plane where the beams n3 and n4 are located and the horizontal plane is -θ. Of course, in practical applications, there may be more than two beams on the plane where the beams n1 and n2 are located, but the average value measured by each beam can be used as the wind speed on the upper plane. Similarly, the wind speed on the lower plane is similar.

[0098] S152: performing linear fitting on n wind shears and the distances between the corresponding wind measuring points and the laser radar to determine a wind shear parameter a in a linear fitting relationship y=a+bx;

[0099] Among them, y is the fitted wind shear corresponding to the wind measurement point at a distance x from the lidar, and b is the slope parameter.

[0100] For the slope parameter b, the formula Calculate and then substitute the slope parameter b into the formula From this, the wind shear parameter a can be determined, where: are the distances x between each wind measurement point and the laser radar iThe average value of wind shear y at each wind measuring point i The average value of .

[0101] S153: Compare and select the minimum value of the wind shear parameter a and the wind shear corresponding to the first wind measuring point as the current wind shear; wherein the first wind measuring point is the wind measuring point closest to the blade among the n wind measuring points.

[0102] It should be noted that in this application, the locations of the laser radar and the wind turbine are regarded as the same location, and the wind shear parameter a is equivalent to the size of the wind shear that has currently blown onto the wind turbine generator set to a certain extent.

[0103] As mentioned above, in extreme cases, wind shear is generally negative, so the smaller of the wind shear parameter and the wind shear at the first wind measuring point has a larger absolute value. In this embodiment, the minimum of the wind shear parameter and the wind shear at the first wind measuring point is used as the current wind shear to determine the current pitch angle of the wind turbine blade, which can further improve the safety of the wind turbine and avoid the problem of blade tip sweeping the tower.

[0104] The following is an introduction to a pitch control device of a wind turbine generator set provided in an embodiment of the present invention. The pitch control device of a wind turbine generator set described below and the pitch control method of a wind turbine generator set described above can be referred to each other.

[0105] Figure 6 The structural block diagram of the pitch control device of the wind turbine generator set provided by the embodiment of the present invention is shown in FIG. Figure 6 The pitch control device of the wind turbine generator set may include:

[0106] The wind speed detection module 100 is used to collect the blade tip clearance value of the wind turbine generator set and determine whether the blade tip clearance value is greater than the warning value. If so, the current wind speed corresponding to the wind turbine generator set within a preset distance interval is detected and obtained;

[0107] The wind shear module 200 is used to determine whether the current wind speed reaches the warning wind speed, and if so, to detect and obtain the current wind shear corresponding to the position within the preset distance interval;

[0108] The pitch angle module 300 is used to determine the pitch angle of the wind turbine generator set according to the current wind shear.

[0109] In an optional embodiment of the present application, the wind shear module 200 includes:

[0110] A single-point wind shear unit, used to obtain wind shears corresponding to n wind measuring points within the preset distance interval by using a laser radar; wherein the laser radar is arranged on the wind turbine generator set;

[0111] A shear parameter unit, used to perform linear fitting on the n wind shears and the corresponding distances between the wind measuring points and the laser radar, and determine the wind shear parameter a in the linear fitting relationship y=a+bx; wherein y is the fitted wind shear corresponding to the wind measuring point at a distance x from the laser radar, and b is a slope parameter;

[0112] The wind shear comparison unit is used to compare and select the data with the smallest absolute value between the wind shear parameter a and the wind shear corresponding to the first wind measuring point as the current wind shear; wherein the first wind measuring point is the wind measuring point closest to the blade among the n wind measuring points.

[0113] In an optional embodiment of the present application, the single-point wind shear unit is specifically used to measure the upper plane wind speed and the lower plane wind speed using the laser radar, wherein the upper plane wind speed and the lower plane wind speed are respectively the wind speeds of the upper plane and the lower plane with equal and opposite pitch angles to the horizontal plane, and the laser radar is located at the intersection of the upper plane and the lower plane; using the wind shear formula Determine the wind shear corresponding to each wind measurement point; where v hi is the upper plane wind speed at the i-th wind measurement point, v li is the upper plane wind speed of the i-th wind measurement point, i∈1,2,3,…,n, x i is the distance from the ith wind measurement point to the laser radar, H is the height of the laser radar, and θ is the pitch angle.

[0114] In an optional embodiment of the present application, the wind speed detection module 100 is specifically used to obtain the wind speeds corresponding to the n wind measuring points within the preset distance interval by using a laser radar; the wind speed corresponding to the first wind measuring point is taken as the current first wind speed, and the average wind speed of the n crosswind points is taken as the current second wind speed;

[0115] Accordingly, the wind shear module 200 is specifically configured to determine whether at least one of the current first wind speed and the current second wind speed reaches the warning wind speed.

[0116] In an optional embodiment of the present application, a wind measurement point setting module is included, which is used to make the arithmetic progression {k(1), k(2), ..., k(n)} satisfy: k(1) =x1,e k(i) =x i , e k(n) =x n ; Wherein, x1 is equal to the distance between the starting boundary point of the preset distance interval and the laser radar, x n=Equal to the distance between the end boundary point of the preset distance interval and the laser radar; according to the arithmetic relationship between the elements in the arithmetic sequence {k(1), k(2), ..., k(n)}, x1, x n , determine the distance between each of the wind measurement points and the laser radar.

[0117] In an optional embodiment of the present application, the wind shear module 200 is specifically used to determine whether the current wind speed is greater than the first warning wind speed and less than the second warning wind speed; if not, the pitch angle of the wind turbine generator set is kept unchanged; if so, the step of detecting and obtaining the current wind shear corresponding to the position within the preset distance interval is performed; wherein, the first warning wind speed is less than the rated wind speed, and the second warning wind speed is greater than the rated wind speed, and the rated wind speed is the wind speed corresponding to the rated rotation speed of the wind turbine generator set.

[0118] The pitch control device of the wind turbine generator set of this embodiment is used to implement the aforementioned pitch control method of the wind turbine generator set. Therefore, the specific implementation method of the pitch control device of the wind turbine generator set can be found in the embodiment part of the pitch control method of the wind turbine generator set in the previous text, and will not be repeated here.

[0119] The present application also provides an embodiment of a pitch control device for a wind turbine generator set, which may include:

[0120] Memory for storing computer programs;

[0121] A processor is used to implement the steps of the variable pitch control method for a wind turbine generator set as described in any one of the above items when executing the computer program.

[0122] The pitch control method of the wind turbine generator set may include:

[0123] Collecting the tip clearance value of the wind turbine generator set and determining whether the tip clearance value is greater than the warning value, and if so, detecting and obtaining the current wind speed corresponding to the wind turbine generator set within a preset distance interval;

[0124] Determine whether the current wind speed reaches the warning wind speed, and if so, detect and obtain the current wind shear corresponding to the position within the preset distance interval;

[0125] The current pitch angle of the wind turbine generator set is determined according to the current wind shear and a predetermined corresponding relationship between the wind shear and the pitch angle.

[0126] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the variable pitch control method for a wind turbine generator set as described in any one of the above items are implemented.

[0127] The computer-readable storage medium may include: random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the technical field.

[0128] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0129] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A variable pitch control method for a wind turbine generator set, characterized in that: include: Collecting the tip clearance value of the wind turbine generator set and determining whether the tip clearance value is greater than the warning value, and if so, detecting and obtaining the current wind speed corresponding to the wind turbine generator set within a preset distance interval; Determine whether the current wind speed reaches the warning wind speed, and if so, detect and obtain the current wind shear corresponding to the position within the preset distance interval; Determining a current pitch angle of the wind turbine generator set according to the current wind shear and a predetermined correspondence relationship between the wind shear and the pitch angle; Detecting and obtaining the current wind shear corresponding to the position within the preset distance interval includes: The preset distance interval is obtained by using laser radar measurement n The wind shears corresponding to the wind measuring points are as follows; wherein the laser radar is arranged on the wind turbine generator set; right n The wind shear and the distance between the corresponding wind measuring point and the laser radar are linearly fitted to determine a linear fitting relationship. Wind shear parameters in ;in, The distance from the laser radar is The fitted wind shear corresponding to the wind measurement point is is the slope parameter; Compare and select the wind shear parameters The minimum value of the two wind shear data corresponding to the first wind measurement point is taken as the current wind shear; wherein the first wind measurement point is n The wind measuring point closest to the blade among the wind measuring points; Detecting and obtaining a current wind speed corresponding to a preset distance interval from the wind turbine generator set includes: The preset distance interval is obtained by using laser radar measurement n The wind speed corresponding to each wind measuring point; The wind speed corresponding to the first wind measuring point is the current first wind speed. n The average wind speed of the wind measuring points is the current second wind speed; Accordingly, judging whether the current wind speed reaches the warning wind speed includes: Determine whether at least one of the current first wind speed and the current second wind speed reaches the warning wind speed; set up n The process of determining the location of the wind measurement point includes: Let the arithmetic progression satisfy: , , ;in, is equal to the distance between the starting boundary point of the preset distance interval and the laser radar, Equal to the distance between the end boundary point of the preset distance interval and the laser radar; According to the arithmetic progression The arithmetic relationship between the elements in , , determine the distance between each of the wind measurement points and the laser radar.

2. The pitch control method of a wind turbine generator set according to claim 1, characterized in that: The preset distance interval is obtained by using laser radar measurement n The wind shear corresponding to each wind measuring point includes: The laser radar is used to measure the upper plane wind speed and the lower plane wind speed, respectively, wherein the upper plane wind speed and the lower plane wind speed are wind speeds of the upper plane and the lower plane respectively with equal and opposite pitch angles to the horizontal plane, and the laser radar is located at the intersection of the upper plane and the lower plane; Using the wind shear formula , determine the wind shear corresponding to each of the wind measurement points; wherein, For the The upper plane wind speed of each wind measuring point, For the The upper plane wind speed of each wind measuring point, , For the The distance from the wind measurement point to the laser radar, H is the height of the laser radar, is the pitch angle.

3. The pitch control method of a wind turbine generator set according to claim 1, characterized in that: Determining whether the current wind speed reaches the warning wind speed includes: Determine whether the current wind speed is greater than the first warning wind speed and less than the second warning wind speed; If not, keeping the pitch angle of the wind turbine generator set unchanged; If yes, then executing the step of detecting and obtaining the current wind shear corresponding to the position within the preset distance interval; The first warning wind speed is less than the rated wind speed, and the second warning wind speed is greater than the rated wind speed, and the rated wind speed is the wind speed corresponding to the rated rotation speed of the wind turbine generator set.

4. A variable pitch control device for a wind turbine generator set, characterized in that: include: A wind speed detection module is used to collect the blade tip clearance value of the wind turbine generator set and determine whether the blade tip clearance value is greater than the warning value. If so, the current wind speed corresponding to the wind turbine generator set within a preset distance interval is detected and obtained; A wind shear module, used to determine whether the current wind speed reaches the warning wind speed, and if so, to detect and obtain the current wind shear corresponding to the position within the preset distance interval; A pitch angle module, used to determine the pitch angle of the wind turbine generator set according to the current wind shear; The wind shear module comprises: A single-point wind shear unit, used to obtain wind shears corresponding to n wind measuring points within the preset distance interval by using a laser radar; wherein the laser radar is arranged on the wind turbine generator set; Shear parameter unit, used to n The wind shear and the distance between the corresponding wind measuring point and the laser radar are linearly fitted to determine a linear fitting relationship. Wind shear parameters in ;in, The distance from the laser radar is The fitted wind shear corresponding to the wind measurement point is is the slope parameter; A wind shear comparison unit, used to compare and select the wind shear parameters The data with the smallest absolute value of the two wind shear data corresponding to the first wind measuring point is taken as the current wind shear; wherein the first wind measuring point is n The wind measuring point closest to the blade among the wind measuring points; The wind speed detection module is specifically used to obtain the wind speed within the preset distance interval by using laser radar measurement. n The wind speed corresponding to each wind measuring point is the current first wind speed. n The average wind speed of the wind measuring points is the current second wind speed; Accordingly, the wind shear module is specifically used to determine whether at least one of the current first wind speed and the current second wind speed reaches the warning wind speed; Including wind measurement point setting module, used to make arithmetic progression satisfy: , , ;in, is equal to the distance between the starting boundary point of the preset distance interval and the laser radar, is equal to the distance between the end boundary point of the preset distance interval and the laser radar; according to the arithmetic progression The arithmetic relationship between the elements in , , determine the distance between each of the wind measurement points and the laser radar.

5. A pitch control device for a wind turbine generator set, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the pitch control method of a wind turbine generator set as claimed in any one of claims 1 to 3 when executing the computer program.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the pitch control method for a wind turbine generator set according to any one of claims 1 to 3 are implemented.

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