阅读说明：本技术 一种风力发电机叶片气动不平衡的检测方法和系统 (Method and system for detecting aerodynamic imbalance of wind driven generator blade ) 是由 张庆运 范国印 吴翟权 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种风力发电机叶片气动不平衡检测方法,包括如下步骤：S1:将采集的三只风机叶片的图片数据进行筛选；S2:通过图像过滤算法,计算出被筛选出的三只叶片叶尖照片的边缘图像；S3:通过对三只叶片的边缘图像像素特征对比,计算出给定参考线下的图像边缘像素距离；S4:比较图像像素距离的相对偏差率,根据偏差率与设定值比较,给出三只叶片的TC角度是否一致的结论,如果不一致,给出具体叶片角度调整的方向。本发明还公开了一种风力发电机叶片气动不平衡检测方法的系统,所述系统包括视频采集装置模块,所述视频采集装置模块连接有便携式计算机,所述便携式计算机中安装有视频分析系统APP。(The invention discloses a method for detecting the aerodynamic imbalance of a wind driven generator blade, which comprises the following steps: s1, screening the collected picture data of the three fan blades; s2, calculating edge images of the screened three blade tip photos through an image filtering algorithm; s3, calculating the image edge pixel distance under the given reference line by comparing the edge image pixel characteristics of the three blades; and S4, comparing the relative deviation ratio of the image pixel distance, comparing the deviation ratio with a set value, giving a conclusion whether the TC angles of the three blades are consistent, and giving the adjustment direction of the specific blade angle if the TC angles are not consistent. The invention also discloses a system for the method for detecting the pneumatic imbalance of the blades of the wind driven generator, which comprises a video acquisition device module, wherein the video acquisition device module is connected with a portable computer, and a video analysis system APP is installed in the portable computer.)

1. A method for detecting the aerodynamic imbalance of a wind driven generator blade is characterized by comprising the following steps:

s1, screening the collected picture data of the three fan blades;

s2, calculating edge images of the screened three blade tip photos through an image filtering algorithm;

s3, calculating the image edge pixel distance under the given reference line by comparing the edge image pixel characteristics of the three blades;

and S4, comparing the relative deviation ratio of the image pixel distance, comparing the deviation ratio with a set value, giving a conclusion whether the TC angles of the three blades are consistent, and giving the adjustment direction of the specific blade angle if the TC angles are not consistent.

2. The method for detecting the aerodynamic imbalance of the blades of the wind driven generator as claimed in claim 1, wherein in the step S1, the method for acquiring the fan blade picture is static acquisition and dynamic acquisition.

3. The method for detecting the aerodynamic imbalance of the wind turbine blade according to claim 2, wherein the static collection method is to take a still picture of the wind turbine blade by taking a picture of a camera of the video collection device.

4. The method for detecting the aerodynamic imbalance of the blades of the wind driven generator according to claim 2, wherein the dynamic collection method includes obtaining a dynamic video of the fan blades through camera shooting of a video collection device, transmitting the obtained dynamic video to the video analysis system, performing frame extraction processing on the obtained dynamic video by the video analysis system, taking out picture identifications and numbers of the fan blades, calculating feature values of blade rotation positions in the pictures, and screening out pictures of three blades of the wind driven generator sweeping the same positions by the video analysis system according to the feature values of the blade rotation positions.

5. A system for a method for detecting the aerodynamic imbalance of blades of a wind turbine according to claims 1 to 4, wherein the system comprises a video capture module for capturing three pictures of the blades; the video acquisition device module is connected with a portable computer, a video analysis system APP is installed in the portable computer and used for screening and calculating the collected fan blade pictures.

6. The system of claim 5, wherein the video capture device is fixedly disposed on the ground.

7. The system for detecting the aerodynamic imbalance of wind turbine blades as claimed in claim 5, wherein the video analysis system APP is used for analyzing and calculating the acquired pictures of the wind turbine blades.

Technical Field

The invention relates to the technical field of detection of the unbalance of the aerodynamic characteristics of blades of wind driven generators, in particular to a method and a system for detecting the aerodynamic unbalance of the blades of the wind driven generators.

Background

Currently, a method for detecting aerodynamic characteristics of a blade is based on marking a tip chord line 0 degree angle of the blade at the root of the blade according to the tip chord line or a joint line of the blade in a factory manufacturing process of the blade. During the actual operation of the pitch wind driven generator, the pneumatic imbalance of the three blades needs to be positioned according to the identification scale.

In the existing marking method, through the movement of a blade mechanical system, a 0-scale mark on a blade, namely a projection of a blade tip chord line of the blade on a blade bearing installation plane, is aligned to a certain design position on a hub, and then, a variable pitch angle of the blade is calibrated in a controller of a wind driven generator.

As the rated power of the wind driven generator is increased, longer blades are required, and the accuracy of blade tip chord angle identification is more and more important. The unbalanced blade tip chord line projection angle represents unbalanced load brought to the wind driven generator, the vibration of the wind driven generator can be caused, the power curve of the wind driven generator is poor, the power generation loss is brought, and even the fatigue life of the blade can be influenced, so that the accurate identification of the TC 0 degree of the wind driven generator blade is more and more important.

In fact, the pneumatic imbalance of the blade may be brought about by the loss of the identification card, or by inaccurate nailing of the card during the workshop manufacturing process.

Disclosure of Invention

In view of the above technical problems in the related art, the present invention provides a method and a system for detecting a wind turbine blade aerodynamic imbalance, which can overcome the above disadvantages in the prior art.

In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:

a method for detecting the aerodynamic imbalance of a wind driven generator blade is characterized by comprising the following steps:

s1, screening the collected picture data of the three fan blades;

s2, calculating edge images of the screened three blade tip photos through an image filtering algorithm;

s3, calculating the image edge pixel distance under the given reference line by comparing the edge image pixel characteristics of the three blades;

and S4, comparing the relative deviation ratio of the image pixel distance, comparing the deviation ratio with a set value, giving a conclusion whether the TC angles of the three blades are consistent, and giving the adjustment direction of the specific blade angle if the TC angles are not consistent.

Further, in step S1, the still capturing method includes taking a picture of the fan blade by a camera of the video capturing device.

Further, in step S1, the dynamic collection method includes capturing a dynamic video of the fan blade by a camera of the video collection device, and transmitting the captured dynamic video to the video analysis system, where the video analysis system performs frame extraction on the captured dynamic video, extracts picture identifiers and numbers of the fan blade, and calculates feature values of blade rotation positions in the pictures, and the video analysis system screens out pictures of three blades of the wind turbine generator sweeping the same position according to the feature values of the blade rotation positions.

The invention also provides a system of the method for detecting the aerodynamic imbalance of the blades of the wind driven generator, wherein the system comprises a video acquisition device module used for acquiring the pictures of the three fan blades; the video acquisition device module is connected with a portable computer, a video analysis system APP is installed in the portable computer and used for screening and calculating the collected fan blade pictures.

Furthermore, the video acquisition device is fixedly arranged on the ground.

Further, the video analysis system APP is used for analyzing and calculating the collected pictures of the fan blades.

The invention has the beneficial effects that: through the detection and the analysis of this pneumatic unbalanced blade detecting system of application, under aerogenerator with specific blade pitch angle and the rotatory condition of impeller, gather blade tip high definition video, whether the TC angle of three blades of discerning the aerogenerator fast is unanimous, if inconsistent, carries out quick adjustment according to the direction of the concrete blade angular adjustment that analytic system gave, efficient, the accuracy is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a flowchart illustrating a method for detecting aerodynamic imbalance of a wind turbine blade according to an embodiment of the present invention.

FIG. 2 is a system diagram of a system for detecting aerodynamic imbalance of a wind turbine blade according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

As shown in fig. 1 and 2, a method for detecting an aerodynamic imbalance of a wind turbine blade according to an embodiment of the present invention is characterized by comprising the following steps:

s1, screening the collected picture data of the three fan blades;

s2, calculating edge images of the screened three blade tip photos through an image filtering algorithm;

s3, calculating the image edge pixel distance under the given reference line by comparing the edge image pixel characteristics of the three blades;

and S4, comparing the relative deviation ratio of the image pixel distance, comparing the deviation ratio with a set value, giving a conclusion whether the TC angles of the three blades are consistent, and giving the adjustment direction of the specific blade angle if the TC angles are not consistent.

In a specific embodiment, in step S1, the still capturing method is to take a still picture of the fan blade by taking a picture through a camera of the video capturing device.

In a specific embodiment, in step S1, the dynamic collection method includes acquiring a dynamic video of the fan blade by shooting through a camera of the video acquisition device, and transmitting the acquired dynamic video to the video analysis system, where the video analysis system performs frame extraction on the acquired dynamic video, extracts picture identifiers and numbers of the fan blade, and calculates feature values of blade rotation positions in the pictures, and the video analysis system screens out pictures of three blades of the wind turbine that sweep through the same position according to the feature values of the blade rotation positions.

The invention also provides a system of the method for detecting the aerodynamic imbalance of the blades of the wind driven generator, wherein the system comprises a video acquisition device module used for acquiring the pictures of the three fan blades; the video acquisition device module is connected with a portable computer, a video analysis system APP is installed in the portable computer and used for screening and calculating the collected fan blade pictures.

In one embodiment, the video capture device is fixedly disposed on the ground.

In a specific embodiment, the video analysis system APP is used for performing analysis calculation on a captured picture of the fan blade.

In a particular embodiment, the wind turbine rotates with a fixed pitch angle.

In order to facilitate understanding of the above-described technical aspects of the present invention, the above-described technical aspects of the present invention will be described in detail below in terms of specific usage.

According to the method and the system for detecting the aerodynamic imbalance of the blades of the wind driven generator, firstly, a fixed position is selected on the ground, the video acquisition device is positioned, then the video acquisition device is connected with the portable computer, and the portable computer is internally provided with blade rotation video analysis system software. The method comprises the following steps that a fan blade of the wind driven generator rotates by a fixed pitch angle, a lens of video acquisition equipment is aimed at a region to be swept by the blade, when the blade sweeps the lens region, a system records a video segment of a corresponding blade and marks the video segment, meanwhile, video data are transmitted into blade rotation video analysis system software in real time, the blade rotation video analysis system software performs frame extraction processing on the acquired video, a series of blade photos of the wind driven generator are taken out, and blade numbers and picture numbers are marked; the analysis system analyzes and processes the pictures with the blade numbers and the picture numbers, calculates the characteristic values of the rotating positions of the blades in each picture, and then screens out the pictures of three blades of the wind driven generator sweeping the same positions according to the characteristic values of the rotating positions of the blades; and calculating the edge image of the screened blade tip photo by an image filtering algorithm, calculating the image edge pixel distance under a given reference line by comparing the edge image pixel characteristics of the three blades, comparing the relative deviation rate of the image pixel distance, comparing the deviation rate with a set value, giving a conclusion whether the TC angles of the three blades are consistent or not, and giving a specific blade angle adjusting direction if the TC angles are not consistent.

In conclusion, the fan blade detection and analysis method based on the blade rotation video analysis system has the advantages that the fan blade detection and analysis software can quickly identify whether the TC angles of the three blades of the wind driven generator are consistent or not in the impeller rotation state, the adjustment is quickly carried out according to the specific blade angle adjustment direction given by the analysis system, the efficiency is high, and the accuracy is good.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.