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CN-116717435-B - Blade clearance distance early warning method, device, equipment and medium

CN116717435BCN 116717435 BCN116717435 BCN 116717435BCN-116717435-B

Abstract

The invention belongs to the technical field of clearance distance detection, and particularly discloses a blade clearance distance early warning method, device, equipment and medium, which comprise the following steps of obtaining blade basic data and a wind turbine generator set clearance standard, and obtaining the minimum distance according to the blade basic data and the wind turbine generator set clearance standard; the method comprises the steps of generating dangerous contours according to minimum distances, obtaining actual images of each blade according to a first preset time interval, carrying out image recognition on the actual images of each blade by adopting a sliding window to obtain the actual contours of each blade, calculating the coincidence ratio of the actual contours of each blade and the dangerous contours, carrying out early warning according to the coincidence ratio, and adjusting the angles of the blades according to early warning results.

Inventors

  • ZENG LIHUA
  • ZHANG GUO
  • JIANG BEN
  • MENG PENGFEI

Assignees

  • 华能澜沧江水电股份有限公司
  • 中国华能集团清洁能源技术研究院有限公司

Dates

Publication Date
20260505
Application Date
20230620

Claims (7)

  1. 1. The blade clearance distance early warning method is characterized by comprising the following steps of: obtaining blade basic data and a wind turbine generator system clearance standard, and obtaining a minimum distance according to the blade basic data and the wind turbine generator system clearance standard; Generating a dangerous profile according to the minimum distance; Acquiring actual images of each blade according to a first preset time interval, and carrying out image identification on the actual images of each blade by adopting a sliding window to obtain the actual contour of each blade; calculating the coincidence ratio of the actual contour and the dangerous contour of each blade; early warning is carried out according to the overlap ratio, and the angle of the blade is adjusted according to the early warning result; The method comprises the steps of acquiring actual images of each blade according to a first preset time interval, and carrying out image identification on the actual images of each blade by adopting a sliding window to obtain the actual profile of each blade; The step of calculating the coincidence ratio of the actual contour of each blade and the dangerous contour specifically comprises the steps of calculating the dangerous contour area according to the dangerous contour, calculating the actual contour area of each blade according to the actual contour of each blade, calculating the ratio of each actual contour area to the dangerous contour area, and marking the coincidence ratio; the step of pre-warning according to the overlap ratio specifically comprises the following steps: If the overlap ratio is 1, sending out a class A early warning signal, controlling the blade to be in the pulp direction to the minimum value, and stopping the fan; if the overlap ratio is 0.9-0.95, a C-level early warning signal is sent out, and the blade is controlled to perform primary pulp mixing; Calculating the superposition degree after pulp mixing, and controlling the blade to perform secondary pulp mixing if the superposition degree is still 0.9-0.95 after pulp mixing; If the overlap ratio is 0.95-0.98, a B-level early warning signal is sent out, and the blade is controlled to perform three-time pulp mixing; calculating the superposition degree after pulp mixing, if the superposition degree is still 0.95-0.98 after pulp mixing, sending out a class A early warning signal, controlling the blade to be in the pulp mixing state to the minimum value, and stopping the fan; If the overlap ratio is less than 0.9, no early warning is carried out.
  2. 2. The blade clearance distance warning method according to claim 1, wherein the dangerous profile is a blade image profile when a blade top-to-tower clearance is equal to a minimum distance.
  3. 3. The blade clearance distance warning method according to claim 1, wherein the primary pulp mixing, the secondary pulp mixing and the tertiary pulp mixing satisfy the following relationship: the angle of primary pulp mixing is smaller than the angle of secondary pulp mixing is smaller than the angle of tertiary pulp mixing.
  4. 4. A blade clearance distance warning device for implementing the blade clearance distance warning method of claim 1, comprising: The minimum distance calculation module is used for acquiring basic data of the blades and the clearance standard of the wind turbine generator system, and obtaining the minimum distance according to the basic data of the blades and the clearance standard of the wind turbine generator system; The dangerous contour generation module is used for generating a dangerous contour according to the minimum distance; The infrared cameras are used for acquiring actual images of each blade according to a first preset time interval; The actual contour extraction module is used for carrying out image recognition on the actual image of each blade by adopting a sliding window to obtain the actual contour of each blade; the contact ratio calculating module is used for calculating the contact ratio of the actual contour and the dangerous contour of each blade; And the early warning module is used for carrying out early warning according to the overlap ratio and adjusting the angle of the blade according to the early warning result.
  5. 5. The blade clearance distance early warning device according to claim 4, wherein the number of the infrared cameras (1) is the same as the number of the blades, and an infrared camera (1) is arranged on a fan hub (3) between each blade (2) and the tower.
  6. 6. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements a blade clearance warning method as claimed in any one of claims 1 to 3 when the computer program is executed by the processor.
  7. 7. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements a blade clearance distance warning method according to any one of claims 1-3.

Description

Blade clearance distance early warning method, device, equipment and medium Technical Field The invention belongs to the technical field of clearance distance detection, and particularly relates to a blade clearance distance early warning method, device, equipment and medium. Background In recent decades, the wind power industry has evolved rapidly. Along with the development of the wind power industry, the construction cost is also continuously reduced. For compression cost, the rigidity of the fan blade gradually slides down, and the deformation of the fan blade is increased due to the reduction of the rigidity of the fan blade. Meanwhile, as the power of the wind generating set rises, the size of the blades also increases. In the running process of the wind turbine generator, the situation that the blades collide with the tower drum possibly occurs due to overlarge deformation of the blades is called as tower sweeping, and the size of the wind turbine generator is increased along with the reduction of the rigidity of the blades of the fan, so that the tower sweeping accident is frequently caused. In recent years, fan collapse events have occurred, most of the reasons being due to fan blade tower sweeping. How to avoid the fan blade sweeping tower as much as possible without greatly increasing the cost is an important problem in the field of wind power generation. Disclosure of Invention The invention aims to provide a blade clearance distance early warning method, device, equipment and medium, which are used for solving the technical problem that accidents frequently occur due to the fact that the existing fan blade is swept. In order to achieve the above purpose, the invention adopts the following technical scheme: in a first aspect, a blade clearance distance early warning method includes the steps of: obtaining blade basic data and a wind turbine generator system clearance standard, and obtaining a minimum distance according to the blade basic data and the wind turbine generator system clearance standard; Generating a dangerous profile according to the minimum distance; Acquiring actual images of each blade according to a first preset time interval, and carrying out image identification on the actual images of each blade by adopting a sliding window to obtain the actual contour of each blade; calculating the coincidence ratio of the actual contour and the dangerous contour of each blade; and carrying out early warning according to the overlap ratio, and adjusting the angle of the blade according to the early warning result. A further improvement of the invention is that the dangerous contour is a blade image contour where the blade tip is at a minimum distance from the tower. The invention further improves that the steps of acquiring the actual image of each blade according to the first preset time interval and adopting a sliding window to carry out image recognition on the actual image of each blade to obtain the actual contour of each blade specifically comprise the following steps: identifying a blade root edge for each actual image; the sliding window slides along the blade edge from the blade root edge of each actual image, resulting in the actual profile of each blade. The invention further improves that the step of calculating the coincidence ratio of the actual contour of each blade and the dangerous contour specifically comprises the following steps: calculating the dangerous contour area according to the dangerous contour; Calculating the actual contour area of each blade according to the actual contour of each blade; The ratio of each actual contour area to the dangerous contour area is calculated and recorded as the degree of recombination. The invention further improves that the steps specifically comprise: If the overlap ratio is 1, sending out a class A early warning signal, controlling the blade to be in the pulp direction to the minimum value, and stopping the fan; if the overlap ratio is 0.9-0.95, a C-level early warning signal is sent out, and the blade is controlled to perform primary pulp mixing; Calculating the superposition degree after pulp mixing, and controlling the blade to perform secondary pulp mixing if the superposition degree is still 0.9-0.95 after pulp mixing; If the overlap ratio is 0.95-0.98, a B-level early warning signal is sent out, and the blade is controlled to perform three-time pulp mixing; calculating the superposition degree after pulp mixing, if the superposition degree is still 0.95-0.98 after pulp mixing, sending out a class A early warning signal, controlling the blade to be in the pulp mixing state to the minimum value, and stopping the fan; If the overlap ratio is less than 0.9, no early warning is carried out. The invention further improves that the primary pulp mixing, the secondary pulp mixing and the tertiary pulp mixing meet the following relations: the angle of primary pulp mixing is smaller than the angle of secondary pulp mixing is smaller tha