Blade stall determination method, device and system of wind turbine generator and medium

Abstract

The invention discloses a blade stall determination method, device and system of a wind turbine generator and a medium, first spanwise wind speeds of N preset test points of a first blade measured by a laser wind measurement radar are obtained, the laser wind measurement radar is installed on the suction surface of the first blade, and the installation position of the laser wind measurement radar is different from the positions of the preset test points; the mounting angle of a lens of the laser wind finding radar is a first mounting angle; and according to the first spanwise wind speed of each preset test point, whether the first blade stalls is determined, and a stall result is obtained. According to the embodiment of the invention, the spanwise wind speeds of the N preset test points can be measured only by installing one laser wind measurement radar on the first blade, multiple laser wind measurement radars do not need to be installed, and the installation positions of the laser wind measurement radars do not coincide with the positions of the test points, so that the influence of the laser wind measurement radars on the flow fields of the test points can be reduced, and the measurement accuracy is improved. Therefore, the influence on the stall judgment result is reduced, and the accuracy of the stall judgment result is improved.

Description

Technical Field

[0001] The present application relates to the field of wind power technology, and in particular to a method, device, system and medium for determining blade stall of a wind turbine. Background Art

[0002] During the operation of a wind turbine, due to the contamination of the blade surface or the low air density in the operating environment, the airflow attached to the surface of a part of the blade is easily separated, which leads to blade stall. Blade stall can cause many adverse effects on the operation of the wind turbine, such as reducing the output power of the wind turbine and affecting the safe operation of the wind turbine.

[0003] At present, the stall judgment of the blade is mainly carried out through the stall sensor, that is, the stall sensor is installed at the test point, and the changes of the stall sensor are used to judge whether the airflow diversion occurs at the test point, and then judge whether the blade is stalled.

[0004] This method requires installing a stall sensor at each test point of the blade, and because the stall sensor is in contact with the test point, the stall sensor has a certain influence on the flow field at the test point, thereby affecting the accuracy of the judgment result. Summary of the invention

[0005] The embodiments of the present application provide a method, device, system and medium for determining blade stall of a wind turbine generator set, which can improve the accuracy of blade stall judgment results.

[0006] In a first aspect, an embodiment of the present application provides a method for determining blade stall of a wind turbine generator set, comprising:

[0007] Obtaining first spanwise wind speeds of N preset test points of the first blade measured by a laser wind measuring radar, where the laser wind measuring radar is installed on the suction surface of the first blade, and the installation position of the laser wind measuring radar is different from the positions of the preset test points, the installation angle of the lens of the laser wind measuring radar is a first installation angle, and N is a positive integer;

[0008] Whether the first blade is stalled is determined according to the first spanwise wind speed at each preset test point, and a stall result is obtained.

[0009] In a second aspect, an embodiment of the present application provides a device for determining blade stall of a wind turbine generator set, comprising:

[0010] an acquisition module, used to acquire a first spanwise wind speed of N preset test points of a first blade measured by a laser wind measuring radar, wherein the laser wind measuring radar is installed on a suction surface of the first blade, and an installation position of the laser wind measuring radar is different from a position of each preset test point, an installation angle of a lens of the laser wind measuring radar is a first installation angle, and N is a positive integer;

[0011] The determination module is used to determine whether the first blade is stalled according to the first spanwise wind speed of each preset test point, and obtain a stall result.

[0012] In a third aspect, an embodiment of the present application provides a blade stall determination system for a wind turbine generator set, comprising:

[0013] A laser wind measuring radar is used to measure a first spanwise wind speed at N preset test points of the first blade, the laser wind measuring radar is installed on the suction surface of the first blade, and the installation position of the laser wind measuring radar is different from the positions of the preset test points. The installation angle of the lens of the laser wind measuring radar is a first installation angle, and N is a positive integer;

[0014] For example, the blade stall determination device for a wind turbine generator set according to the second aspect.

[0015] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the method of the first aspect is implemented.

[0016] The embodiment of the present application obtains the first spanwise wind speed of N preset test points of the first blade measured by the laser wind radar, the laser wind radar is installed on the suction surface of the first blade, and the installation position of the laser wind radar is different from the position of the preset test point, the installation angle of the lens of the laser wind radar is the first installation angle, and N is a positive integer; according to the first spanwise wind speed of each preset test point, it is determined whether the first blade is stalled, and the stall result is obtained. That is, the embodiment of the present application only needs to install one laser wind radar on the first blade to measure the spanwise wind speed of N preset test points, and there is no need to install multiple laser wind radars. Moreover, the installation position of the laser wind radar does not coincide with the position of each test point, so that the influence of the laser wind radar on the flow field of the test point can be reduced, thereby reducing the influence on the stall judgment result and improving the accuracy of the stall judgment result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A flow chart of a method for determining blade stall of a wind turbine provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the airflow state on the blade surface when the blade is not separated provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the airflow state on the blade surface when a blade is partially separated provided in an embodiment of the present application;

[0021] Figure 4A schematic diagram of the spanwise velocity of a blade when no separation occurs provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the spanwise velocity of a blade when it separates provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the installation of a laser wind measurement radar provided in an embodiment of the present application;

[0024] Figure 7 A flow chart of another method for determining blade stall of a wind turbine provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the relationship between a preset test point and a corresponding preset range provided in an embodiment of the present application;

[0026] Fig. 9 A structural diagram of a blade stall determination device for a wind turbine set provided in an embodiment of the present application;

[0027] Fig.10 A structural diagram of a blade stall determination system for a wind turbine set provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0029] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] During the operation of a wind turbine, when the airfoil of a local section of the blade separates, it will be accompanied by a certain stall, which will lead to insufficient output of the unit on a macro level, manifested as a rightward shift or collapse of the power curve, thus affecting the output power and safe operation of the unit.

[0031] In actual applications, due to reasons such as the contamination of the unit blade surface or the low air density of the operating environment, the airflow attached to the surface within a certain range of the blade may easily separate, leading to blade stall.

[0032] The related technology judges whether the blade is stalled based on the stall sensor installed on the blade. This method requires installing a stall sensor at each test point of the blade, and the stall sensor is in contact with the test point, causing the stall sensor to have a certain influence on the flow field at the test point, thereby affecting the accuracy of the judgment result.

[0033] To this end, the embodiments of the present application provide a method, device, system and medium for determining blade stall of a wind turbine generator set, which can improve the accuracy of the blade stall judgment result.

[0034] Figure 1 A flow chart of a method for determining blade stall of a wind turbine provided in an embodiment of the present application, such as Figure 1 As shown, the method for determining blade stall of a wind turbine generator set may include the following steps:

[0035] S110, obtaining first spanwise wind speeds of N preset test points of a first blade measured by a laser wind measurement radar.

[0036] The laser wind measuring radar is installed on the suction surface of the first blade, and the installation position of the laser wind measuring radar is different from the positions of each preset test point. The installation angle of the lens of the laser wind measuring radar is a first installation angle, and N is a positive integer.

[0037] S120. Determine whether the first blade is stalled according to the first spanwise wind speed at each preset test point, and obtain a stall result.

[0038] The embodiment of the present application obtains the first spanwise wind speed of N preset test points of the first blade measured by the laser wind radar, the laser wind radar is installed on the suction surface of the first blade, and the installation position of the laser wind radar is different from the position of the preset test point, the installation angle of the lens of the laser wind radar is the first installation angle, and N is a positive integer; according to the first spanwise wind speed of each preset test point, it is determined whether the first blade is stalled, and the stall result is obtained. That is, the embodiment of the present application only needs to install one laser wind radar on the first blade to measure the spanwise wind speed of N preset test points, and there is no need to install multiple laser wind radars. Moreover, the installation position of the laser wind radar does not coincide with the position of each test point, so that the influence of the laser wind radar on the flow field of the test point can be reduced, thereby reducing the influence on the stall judgment result and improving the accuracy of the stall judgment result.

[0039] The above steps are described in detail below:

[0040] In S110, it should be understood that when the angle of attack is greater than the critical angle of attack, the surface airflow starting from the trailing edge of the airfoil changes from an attached state to a separated state, and the flow form after separation is in the form of a larger-scale vortex.

[0041] For example, Figure 2 As shown in Figure 2, when the blades are not separated, the airflow on the blade surface is in an attached flow state. When the blades are partially separated, as shown in Figure 2, Figure 3 As shown, the airflow within the separation range is no longer in an attached state, but will form vortices, accompanied by the diffusion of the vortices, some of which are larger in scale.

[0042] When the blades separate, due to the generation of large-scale vortices, obvious spanwise flow characteristics will appear, which is manifested as obvious spanwise velocity characteristics. For details, please refer to Figure 4 and Figure 5 , Figure 5 The shaded area represents the spanwise wind speed at separation.

[0043] Therefore, the spanwise wind speed of the first blade at each preset test point can be obtained, and then whether the first blade is stalled can be determined according to the spanwise wind speed.

[0044] For example, the spanwise wind speed of each preset test point of the first blade can be obtained by a laser wind radar. Figure 5 As shown in the figure, the laser wind radar can capture the changes in the spanwise wind speed, providing a basis for subsequent blade stall judgment.

[0045] Laser wind radar is an instrument that uses the principle of Doppler frequency shift to achieve non-contact wind speed measurement based on the frequency difference caused by the aerosol's own speed within the laser beam range. The embodiment of the present application uses the laser wind radar to perform stall judgment in a non-contact manner with the test point, which reduces the impact of the laser wind radar on the flow field of each test point, thereby reducing the impact on the blade stall judgment result and improving the accuracy of the blade stall judgment result. At the same time, the embodiment of the present application can measure the wind speed of multiple test points in the blade through a laser wind radar, without the need to install a laser wind radar for each test point, thereby reducing costs.

[0046] Among them, different preset test points correspond to different test distances, and the test distance can be the distance between the preset test point and the laser wind measurement radar.

[0047] Exemplarily, the laser wind measuring radar may be installed on the suction surface of the first blade, and the installation position is different from the positions of each preset test point of the first blade.

[0048] For example, reference Figure 6 The laser wind measuring radar 610 can be fixed on a radar bracket 620, and the radar bracket 620 includes the degrees of freedom in the up-down and left-right directions, so that the laser beam emitted by the laser wind measuring radar 610 can be adjusted in the up-down and left-right directions.

[0049] The radar bracket 620 is fixed on the blade root bracket 630 , and the blade root bracket 630 and the blade root of the first blade 640 can be connected by glass fiber material, and the connection method is resin gel bonding and fixing.

[0050] For example, Figure 6 As shown, the distance between the laser wind radar 610 and the blade root can be x meters, and the size of x can be set according to actual needs. For example, in some embodiments, x=3. In this installation position, the installation angle of the lens of the laser wind radar 610 is the first installation angle, that is, the first spanwise wind speeds of the N preset test points of the first blade obtained in the embodiment of the present application are all wind speeds measured when the installation angle of the lens of the laser wind radar 610 is the first installation angle.

[0051] The first spanwise wind speed is the wind speed at each preset test point along the spanwise direction, where the spanwise direction is the direction from the blade root to the blade tip.

[0052] For example, the first spanwise wind speed at each preset test point measured by the laser wind measuring radar can be obtained in real time, so that the stall state of the first blade can be monitored in real time, effectively reducing or avoiding problems such as rightward shift and collapse of the power curve due to stall, as well as unit vibration problems caused by stall induction.

[0053] In S120, after the first spanwise wind speed of each preset test point is obtained by the laser wind measuring radar, it is possible to determine whether the first blade is stalled according to the first spanwise wind speed of each preset test point, and obtain a stall determination result.

[0054] Exemplarily, whether the first blade is stalled may be determined in the following manner:

[0055] In the case where at least one first spanwise wind speed is greater than a set threshold, determining that the first blade is stalled;

[0056] When the first spanwise wind speed at each preset test point is less than or equal to a set threshold, it is determined that the first blade is not stalled.

[0057] Specifically, when it is determined that the first spanwise wind speed of at least one preset test point is greater than a set threshold, it can be determined that the first blade is stalled; if the first spanwise wind speeds of each preset test point are less than or equal to the set threshold, it can be determined that the first blade is not stalled.

[0058] The threshold value may be set according to actual needs, for example, it may be set to 5 m / s.

[0059] When judging whether the first blade is stalled, the embodiment of the present application only needs to install a laser wind measuring radar on the first blade, which can reduce costs. Moreover, since the laser wind measuring radar does not contact the preset test points, the influence of the laser wind measuring radar on the flow field of each preset test point can be reduced, thereby reducing the influence on the blade stall judgment result and improving the accuracy of the stall judgment result.

[0060] When it is determined that the first blade is stalled, the pitch control system may be notified to adjust the pitch angle of the first blade to improve the state of the first blade and ensure the safe operation of the wind turbine.

[0061] Exemplarily, after S120, the method for determining blade stall of a wind turbine generator set may further include the following steps:

[0062] When it is determined that the first blade is stalled, obtaining a plurality of first spanwise wind speeds within a preset time window;

[0063] Taking a weighted average of the first span-wise wind speeds within a preset time window to obtain a second span-wise wind speed;

[0064] The second spanwise wind speed is transmitted to the pitch control system of the wind turbine generator set, so that the pitch control system adjusts the pitch angle of the first blade according to the second spanwise wind speed, so as to adjust the first blade from a stalled state to a non-stalled state.

[0065] The size of the preset time window can be set according to actual needs. For example, when it is determined that the first blade is stalled, multiple first span-wise wind speeds within the preset time window including the current time point can be obtained, and the weighted average of the first span-wise wind speeds within the time window is performed to obtain the second span-wise wind speed.

[0066] After obtaining the second spanwise wind speed, the second spanwise wind speed can be sent to the variable pitch system of the wind turbine, and the variable pitch system adjusts the pitch angle of the first blade according to the second spanwise wind speed, so that the first blade is adjusted from a stalled state to a non-stalled state, thereby ensuring the normal operation of the wind turbine.

[0067] The embodiment of the present application can not only determine whether the first blade is stalled, but also obtain the second spanwise wind speed, and use the second spanwise wind speed as the input of the variable pitch system, so that the variable pitch system performs stall control based on the second spanwise wind speed. In this way, the constraints on the aerodynamic shape design caused by blade stall can be reduced to a certain extent, so that the designed aerodynamic shape can meet the requirements of power increase and load reduction to a greater extent.

[0068] In some embodiments, Figure 7 As shown, the method for determining blade stall of a wind turbine generator set may include the following steps:

[0069] S710. For a first preset test point, obtain a first preset wind speed range measured by a laser wind radar.

[0070] Among them, the first preset test point is any one of N preset test points, the first preset wind speed range is the aerosol speeds within the first preset range including the first preset test point, the size of the first preset range is positively correlated with the test distance corresponding to the first preset test point, and the test distance is the distance between the first preset test point and the laser wind measurement radar.

[0071] S720: Determine a weighted average of the aerosol velocities within the first preset range as a first spanwise wind speed at a first preset test point.

[0072] S730. Determine whether the first blade is stalled according to the first spanwise wind speed at each preset test point, and obtain a stall result.

[0073] The process of S730 is the same as the process of S120 described above. For details, please refer to S120. For the sake of brevity, it will not be repeated here.

[0074] The other steps above are described in detail below:

[0075] In S710, it should be noted that the first spanwise wind speed of each preset test point measured by the laser wind measuring radar in the embodiment of the present application is not the spanwise wind speed of a single test point, but the weighted average of all aerosol velocities within a range near the preset test point, that is, the first spanwise wind speed of the embodiment of the present application can characterize the separation state of the first blade within a range, thereby improving the accuracy of the blade stall judgment result.

[0076] The first preset wind speed range is the weighted average of the aerosol velocities within the first preset range including the first preset test point. The first preset test point is any one of the N preset test points, that is, the first spanwise wind speed of each preset test point is determined in a similar manner.

[0077] In the embodiment of the present application, different preset test points correspond to different sizes of the first preset range. For example, the larger the test distance between the preset test point and the laser wind radar, the larger the first preset range.

[0078] For example, reference Figure 8 , the test distances between the preset test point A, the preset test point B and the preset test point C and the laser wind measuring radar increase successively, and the first preset wind speed ranges corresponding to the preset test point A, the preset test point B and the preset test point C increase successively.

[0079] For example, the test distance corresponding to the preset test point A is 30m, and the first preset range is 28m-32m, that is, for the preset test point A, the laser wind radar measures the aerosol velocity between 28m-32m.

[0080] For another example, the test distance corresponding to the preset test point C is 70m, and the first preset range is 60m-80m, that is, for the preset test point C, the laser wind radar measures the aerosol velocity between 60m-80m. That is, the wind speed at a preset test point can be used to characterize the spanwise wind speed of the corresponding blade within a range.

[0081] In this way, the embodiment of the present application can obtain the flow state of the entire blade surface through a few test points, so that the blade stall state can be accurately judged. For example, taking the first blade with a length of 100m as an example, 5 test points can be set.

[0082] In S720, for each first preset test point, a weighted average is performed on the aerosol velocities within the first preset wind speed range corresponding to the first preset test point to obtain the first spanwise wind speed corresponding to the first preset test point, thereby providing a basis for subsequent determination of whether the first blade is stalled.

[0083] In the embodiment of the present application, for each test point, a weighted average of all aerosol velocities within a range near the test point is taken as the spanwise wind speed of the test point. In this way, the flow state of the entire blade surface can be obtained through limited test points, thereby accurately determining whether the blade is stalled.

[0084] It should be understood that the installation angle of the lens of the laser wind measuring radar is different, and the angle of the laser beam emitted by the laser wind measuring radar will also be different, thereby affecting the wind speed value of each preset test point, and further affecting the judgment result of blade stall.

[0085] Exemplarily, before S110, the method for determining blade stall of the wind turbine generator set may include the following S100-S101:

[0086] S100, obtaining separation areas of each preset cross section of the first blade along the span direction, and bending deformation data of the first blade at each preset cross section when the wind turbine generator set is in a target operating state.

[0087] S101 . Determine a first installation angle of a lens of a laser wind measuring radar according to separation areas of each preset cross section and bending deformation data of a first blade at each preset cross section.

[0088] Specifically, in S100, the preset cross section may be a cross section of the first blade at a preset test point, and the separation area of ​​each preset cross section is the separation range of each cross section of the first blade along the span direction. The separation area of ​​each preset cross section may be obtained by simulating the first blade using a computational fluid dynamics (CFD) simulation technology.

[0089] By analyzing the CFD simulation results, it is found that when the blades separate, the larger the angle of attack, the more obvious the separation feature is, and the larger the range of obvious spanwise velocity is. For example, the separation range of the blades at the stall critical angle of attack can be used as the separation range of each preset cross section, that is, the separation area.

[0090] The target operating state may be the speed and pitch angle of the wind turbine in the wind speed range where stall may occur, wherein the wind speed range where stall may occur is relatively small, usually 10-11 m / s, the corresponding speed is generally the rated speed, and the corresponding pitch angle is generally the minimum pitch angle.

[0091] The bending deformation data of the first blade at each preset cross section can be obtained through simulation, or calculated based on the on-site test results. For example, the bending deformation data of the first blade at different cross sections can be calculated based on the test data of the strain gauge at the blade root. The bending deformation data at different cross sections provide the relative position relationship of different cross sections along the span direction.

[0092] In S101, according to the separation areas of the preset cross sections and the bending deformation data of the first blade at the preset cross sections, combined with the installation position of the laser wind radar, the installation angle of the lens of the laser wind radar under the working condition, that is, the first installation angle, can be determined.

[0093] The embodiment of the present application utilizes the separation areas of each preset cross-section of the first blade along the span direction, and the bending deformation data of the first blade at each preset cross-section when the wind turbine is in the target operating state, to determine the installation angle of the lens of the laser wind measuring radar, so as to accurately obtain the span-wise wind speed of each preset test point, thereby improving the accuracy of the blade stall judgment result.

[0094] Exemplarily, the above S101 may include the following steps:

[0095] For each preset cross section, according to the bending deformation data of the preset cross section and the position of the laser wind radar, a conversion relationship between a first coordinate system where the laser wind radar is located and a second coordinate system where the preset cross section is located is determined;

[0096] Determine the second position information of the first preset point in the first coordinate system according to the conversion relationship and the first position information of the first preset point in the second coordinate system, wherein the first preset point is a point in the separation area of ​​the preset cross section;

[0097] According to the second position information, taking the origin of the first coordinate system as the center, determining a first ray passing through each preset cross section at the same time;

[0098] A first installation angle of the lens is determined according to the direction of the first ray.

[0099] The position and height of the bracket where the laser wind radar is located can be found in Figure 6 For example, the first coordinate system can be established with the lens of the laser wind radar as the center. int , and establish a second coordinate system with the preset section as the center i .

[0100] According to the position of the laser wind radar, the first coordinate system o can be determined int and the second coordinate system o i The transformation matrix (transformation relationship) T i , according to the transformation matrix T i , combined with the first preset point in the second coordinate system o i The first position information of the first preset point in the first coordinate system can be used to determine the second position information of the first preset point in the first coordinate system. The first preset point is a point in the separation area of ​​the preset cross section, that is, the point in the separation area can be converted from the second coordinate system to the first coordinate system.

[0101] The installation angle of the lens can be determined according to the position information of the first preset point corresponding to each preset cross section in the first coordinate system.

[0102] Exemplarily, the spatial points in the first coordinate system may be discretized, for example, into a grid of 0.1*0.1*0.1 m.

[0103] For the discretized space point, the first ray passing through each preset cross section can be determined with the origin of the first coordinate system as the center. The direction of the first ray is the direction of the required laser beam, that is, the installation angle of the lens.

[0104] Taking the separation area corresponding to 10 cross sections distributed within a range of 50 m from r = 30 to r = 80 as an example, from the first coordinate system o int There are n1 lines starting from the origin passing through the separation area of ​​the first section r1, corresponding to n1 direction vectors. On this basis, there are n2 lines passing through the separation area of ​​the second section r2 at the same time, corresponding to n2 direction vectors. And so on, it can be obtained that there are n10 lines passing through the separation area of ​​the tenth section r10 at the same time, corresponding to n10 direction vectors.

[0105] According to n10 direction vectors, the direction of the first ray can be determined. For example, a direction vector can be selected from the n10 direction vectors as the direction of the first ray. For example, when n10 is greater than 1, the average of the direction vectors can also be used as the direction of the first ray.

[0106] The embodiment of the present application determines the direction of the first ray passing through each preset section at the same time based on the first coordinate system where the laser wind measuring radar is located and the second coordinate system where each preset section along the span direction of the first blade is located, combined with the position of the laser wind measuring radar, and then obtains the installation angle of the lens, thereby providing a basis for the subsequent accurate measurement of the spanwise wind speed of each preset test point.

[0107] The embodiment of the present application aims at the characteristic that when separation occurs on the blade surface, large-scale vortices are formed, thereby resulting in obvious spanwise flow. The spanwise velocity of the blade surface is used to judge the flow state of the blade surface, and then a stall judgment result is obtained. At the same time, the wind speed measured by the laser wind measuring radar is actually the weighted average of all aerosol velocities within a range near the test point. This achieves the purpose of covering most of the spanwise range of the blade with limited test points, thereby improving the accuracy of the stall judgment result.

[0108] Based on the same inventive concept, the embodiment of the present application also provides a device for determining blade stall of a wind turbine generator set. Fig. 9 The blade stall determination device of a wind turbine set provided in an embodiment of the present application is described in detail.

[0109] Fig. 9 A structural diagram of a blade stall determination device for a wind turbine set provided in an embodiment of the present application.

[0110] like Fig. 9 As shown, the blade stall determination device of the wind turbine generator set may include:

[0111] An acquisition module 910 is used to acquire a first spanwise wind speed of N preset test points of a first blade measured by a laser wind measuring radar, wherein the laser wind measuring radar is installed on a suction surface of the first blade, and an installation position of the laser wind measuring radar is different from a position of each preset test point, an installation angle of a lens of the laser wind measuring radar is a first installation angle, and N is a positive integer;

[0112] The determination module 920 is used to determine whether the first blade is stalled according to the first spanwise wind speed of each preset test point, and obtain a stall result.

[0113] The embodiment of the present application obtains the first spanwise wind speed of N preset test points of the first blade measured by the laser wind radar, the laser wind radar is installed on the suction surface of the first blade, and the installation position of the laser wind radar is different from the position of the preset test point, the installation angle of the lens of the laser wind radar is the first installation angle, and N is a positive integer; according to the first spanwise wind speed of each preset test point, it is determined whether the first blade is stalled, and the stall result is obtained. That is, the embodiment of the present application only needs to install one laser wind radar on the first blade to measure the spanwise wind speed of N preset test points, and there is no need to install multiple laser wind radars. Moreover, the installation position of the laser wind radar does not coincide with the position of each test point, so that the influence of the laser wind radar on the flow field of the test point can be reduced, thereby reducing the influence on the stall judgment result and improving the accuracy of the stall judgment result.

[0114] In some embodiments, the acquisition module 910 is specifically configured to:

[0115] For a first preset test point, a first preset wind speed range measured by the laser wind measuring radar is obtained, where the first preset test point is any one of the N preset test points, the first preset wind speed range is each aerosol speed within the first preset range including the first preset test point, the size of the first preset range is positively correlated with the test distance corresponding to the first preset test point, and the test distance is the distance between the first preset test point and the laser wind measuring radar;

[0116] A weighted average of the aerosol velocities within the first preset range is determined as a first spanwise wind speed at a first preset test point.

[0117] In some embodiments, the acquisition module 910 is further used to acquire the separation area of ​​each preset cross section of the first blade along the span direction, and the bending deformation data of the first blade at each preset cross section when the wind turbine generator set is in the target operating state, before acquiring the first span direction wind speed of N preset test points of the first blade measured by the laser wind measurement radar;

[0118] The determination module 920 is further configured to determine a first installation angle of the lens of the laser wind measuring radar according to the separation areas of each preset cross section and the bending deformation data of the first blade at each preset cross section.

[0119] In some embodiments, the determination module 920 is specifically configured to:

[0120] For each preset cross section, according to the bending deformation data of the preset cross section and the position of the laser wind radar, a conversion relationship between a first coordinate system where the laser wind radar is located and a second coordinate system where the preset cross section is located is determined;

[0121] Determine the second position information of the first preset point in the first coordinate system according to the conversion relationship and the first position information of the first preset point in the second coordinate system, wherein the first preset point is a point in the separation area of ​​the preset cross section;

[0122] According to the second position information, taking the origin of the first coordinate system as the center, determining a first ray passing through each preset cross section at the same time;

[0123] A first installation angle of the lens is determined according to the direction of the first ray.

[0124] In some embodiments, the acquisition module 910 is further configured to acquire a plurality of first spanwise wind speeds within a preset time window when the determination module 920 determines that the first blade is stalled;

[0125] The blade stall determination device of the wind turbine generator set may also include:

[0126] A weighted average module, used to perform weighted average on each first spanwise wind speed within a preset time window to obtain a second spanwise wind speed;

[0127] The transmission module is used to transmit the second spanwise wind speed to the variable pitch system of the wind turbine generator set, so that the variable pitch system adjusts the pitch angle of the first blade according to the second spanwise wind speed to adjust the first blade from a stalled state to a non-stalled state.

[0128] In some embodiments, the determination module 920 is specifically configured to:

[0129] In the case where at least one first spanwise wind speed is greater than a set threshold, determining that the first blade is stalled;

[0130] When the first spanwise wind speed at each preset test point is less than or equal to a set threshold, it is determined that the first blade is not stalled.

[0131] The blade stall determination device of the wind turbine set provided in the embodiment of the present application can achieve Figure 1-8 To avoid repetition, the various processes in the embodiment of the method for determining blade stall of a wind turbine are not described again.

[0132] Based on the same inventive concept, the embodiment of the present application also provides a blade stall determination system for a wind turbine generator set. Fig.10 The blade stall determination system of the wind turbine set provided in the embodiment of the present application is described in detail.

[0133] Fig.10 A structural diagram of a blade stall determination system for a wind turbine set provided in an embodiment of the present application.

[0134] like Fig.10 As shown, the blade stall determination system of the wind turbine generator set may include:

[0135] A laser wind measuring radar 1010 is used to measure a first spanwise wind speed at N preset test points of a first blade. The laser wind measuring radar is installed on a suction surface of the first blade, and the installation position of the laser wind measuring radar is different from the positions of the preset test points. The installation angle of the lens of the laser wind measuring radar is a first installation angle, and N is a positive integer.

[0136] The blade stall determination device 1020 of the wind turbine generator system as described in the above embodiment.

[0137] The embodiment of the present application obtains the first spanwise wind speed of N preset test points of the first blade measured by the laser wind radar, the laser wind radar is installed on the suction surface of the first blade, and the installation position of the laser wind radar is different from the position of the preset test point, the installation angle of the lens of the laser wind radar is the first installation angle, and N is a positive integer; according to the first spanwise wind speed of each preset test point, it is determined whether the first blade is stalled, and the stall result is obtained. That is, the embodiment of the present application only needs to install one laser wind radar on the first blade to measure the spanwise wind speed of N preset test points, and there is no need to install multiple laser wind radars. Moreover, the installation position of the laser wind radar does not coincide with the position of each test point, so that the influence of the laser wind radar on the flow field of the test point can be reduced, thereby reducing the influence on the stall judgment result and improving the accuracy of the stall judgment result.

[0138] In some embodiments, the blade stall determination system of the wind turbine generator set may further include:

[0139] The variable pitch system is used to adjust the pitch angle of the first blade according to the second spanwise wind speed transmitted by the blade stall determination device 1020, so as to adjust the first blade from a stall state to a non-stall state.

[0140] The blade stall determination system of the wind turbine set provided in the embodiment of the present application can achieve Figure 1-8 To avoid repetition, the various processes in the embodiment of the method for determining blade stall of a wind turbine are not described again.

[0141] In addition, in combination with the blade stall determination method of the wind turbine in the above embodiment, the embodiment of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any of the blade stall determination methods of the wind turbine in the above embodiment is implemented.

[0142] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0143] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link by a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (Radio Frequency, RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0144] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0145] The above reference is according to the method of the present application embodiment, the flow chart of the device (system) and the computer program product and / or the block diagram of the present application embodiment. It should be understood that each square box in the flow chart and / or the block diagram and the combination of each square box in the flow chart and / or the block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function / action specified in one or more square boxes of the flow chart and / or the block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each square box in the block diagram and / or the flow chart and the combination of the square boxes in the block diagram and / or the flow chart can also be realized by the dedicated hardware that performs the specified function or action, or can be realized by the combination of dedicated hardware and computer instructions.

[0146] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for determining blade stall of a wind turbine, characterized in that: include: Obtaining first spanwise wind speeds of N preset test points of a first blade measured by a laser wind measuring radar, wherein the laser wind measuring radar is installed on the suction surface of the first blade, and the installation position of the laser wind measuring radar is different from the positions of the preset test points, the installation angle of the lens of the laser wind measuring radar is a first installation angle, and N is a positive integer; Whether the first blade is stalled is determined according to the first spanwise wind speed of each of the preset test points, and a stall result is obtained.

2. The method according to claim 1, characterized in that The step of obtaining the first spanwise wind speed of N preset test points of the first blade measured by the laser wind measurement radar comprises: For a first preset test point, a first preset wind speed range measured by the laser wind measuring radar is obtained, where the first preset test point is any one of the N preset test points, the first preset wind speed range is each aerosol speed within a first preset range including the first preset test point, and the size of the first preset range is positively correlated with a test distance corresponding to the first preset test point, and the test distance is the distance between the first preset test point and the laser wind measuring radar; A weighted average of the aerosol velocities within the first preset range is determined as the first spanwise wind speed at the first preset test point.

3. The method according to claim 1, characterized in that Before obtaining the first spanwise wind speed of N preset test points of the first blade measured by the laser wind measurement radar, the method further includes: Acquire separation areas of each preset cross section of the first blade along the span direction, and bending deformation data of the first blade at each preset cross section when the wind turbine generator set is in a target operating state; A first installation angle of a lens of the laser wind measuring radar is determined according to the separation areas of the preset cross sections and the bending deformation data of the first blade at the preset cross sections.

4. The method according to claim 3, characterized in that The determining, according to the separation area of ​​each of the preset cross sections and the bending deformation data of the first blade at each of the preset cross sections, a first installation angle of the lens of the laser wind measurement radar comprises: For each preset cross section, according to the bending deformation data of the preset cross section and the position of the laser wind radar, determine the conversion relationship between the first coordinate system where the laser wind radar is located and the second coordinate system where the preset cross section is located; Determine the second position information of the first preset point in the first coordinate system according to the conversion relationship and the first position information of the first preset point in the second coordinate system, wherein the first preset point is a point in the separation area of ​​the preset cross section; Determine, according to the second position information, a first ray passing through each of the preset cross sections simultaneously, with the origin of the first coordinate system as the center; A first installation angle of the lens is determined according to the direction of the first ray.

5. The method according to claim 1, characterized in that After determining whether the first blade is stalled according to the first spanwise wind speed of each of the preset test points and obtaining the stall result, the method further includes: When it is determined that the first blade is stalled, obtaining a plurality of first spanwise wind speeds within a preset time window; Taking a weighted average of the first spanwise wind speeds within the preset time window to obtain a second spanwise wind speed; The second spanwise wind speed is transmitted to the pitch system of the wind turbine generator set, so that the pitch system adjusts the pitch angle of the first blade according to the second spanwise wind speed, so as to adjust the first blade from a stalled state to a non-stalled state.

6. The method according to any one of claims 1 to 5, characterized in that: The determining whether the first blade is stalled according to the first spanwise wind speed of each of the preset test points to obtain a stall result includes: In the case where at least one first spanwise wind speed is greater than a set threshold, determining that the first blade is stalled; When the first spanwise wind speed at each of the preset test points is less than or equal to a set threshold, it is determined that the first blade is not stalled.

7. A device for determining blade stall of a wind turbine, characterized in that: include: an acquisition module, used to acquire a first spanwise wind speed of N preset test points of a first blade measured by a laser wind measuring radar, wherein the laser wind measuring radar is installed on a suction surface of the first blade, and an installation position of the laser wind measuring radar is different from a position of each of the preset test points, an installation angle of a lens of the laser wind measuring radar is a first installation angle, and N is a positive integer; The determination module is used to determine whether the first blade is stalled according to the first spanwise wind speed of each of the preset test points, and obtain a stall result.

8. A blade stall determination system for a wind turbine, characterized in that: include: A laser wind measuring radar, used to measure a first spanwise wind speed at N preset test points of a first blade, wherein the laser wind measuring radar is installed on a suction surface of the first blade, and an installation position of the laser wind measuring radar is different from a position of each of the preset test points, an installation angle of a lens of the laser wind measuring radar is a first installation angle, and N is a positive integer; The blade stall determination device for a wind turbine generator set as claimed in claim 7.

9. The blade stall determination system according to claim 8, characterized in that: Also includes: The variable pitch system is used to adjust the pitch angle of the first blade according to the second spanwise wind speed transmitted by the blade stall determination device, so as to adjust the first blade from a stall state to a non-stall state.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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