Blade clearance monitoring method for wind generating set

Abstract

The invention discloses a blade clearance monitoring method for a wind generating set. The method comprises the steps of firstly, determining a safe clearance value; then, fixing a point at the position which is away from the ground by the safe clearance value; subsequently, mounting a laser distance measurement device with visible light reference on the side face of a cabin, wherein laser faces downwards vertically; when visible light is seen to be cast to the fixed point on the ground, fixing the laser distance measurement device; subsequently, connecting the laser distance measurement device into a control system; in the operation process, if a blade is not bent severely, considering the distance measured by the laser distance measurement device as the distance from the laser distance measurement device to the ground; and if the blade is bent severely due to the wind effect and the measured distance exceeds the safe clearance distance, casting the laser to the blade, and consideringthe distance measured by the laser distance measurement device as the distance from the laser distance measurement device to a lower blade tip of the blade, wherein a control system makes judgment and gives an alarm for halt, the blade stops rotating so that it can be guaranteed that the set operates safely. The method has the advantages of being safe, reliable, precise in measurement, low in cost and the like.

Description

technical field [0001] The present invention relates to the technical field of wind power generators, in particular to a blade clearance monitoring method of wind power generators. Background technique [0002] With the development of technology, the blades of wind turbines are getting longer and longer, which means that the blades are getting softer and more deformed during rotation, which may hit the tower and cause danger. Therefore, it is necessary to monitor the relationship between the blades and the blades in real time. The distance between the towers, that is, the clearance distance. [0003] At present, the method used in the industry to measure the clearance between the blade and the tower is to arrange several laser scanners along the radial direction at 360 degrees on the tower near the lower blade tip of the blade. Calculate the minimum distance between the lower blade tip and the tower. [0004] There are several deficiencies in this technology. First, severa...

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Problems solved by technology

[0004] There are several deficiencies in this technology. First, several laser scanners need to be arranged, and the laser scanners are equipped with angle and distance measurement functions, which are expensive; second, the installation height of the laser scanner is the height of the lower blade tip, and the distance from the ground is at least 20 meters, installation and maintenance are inconvenient, and the cost is high; finally, since the laser is constantly scanning left and right, the blades are also moving, and a moving object to measure another moving object requires a high sampling frequency, and this method passes the measurement The angle and distance between the laser and the blade, the minimum distance is calculated in real time, and the amount of data is large

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