Heliostat light spot size measurement method and device

Abstract

The invention discloses a heliostat light spot size measurement method and device, and the method comprises the following steps: S1, projecting a heliostat light spot to a target, obtaining an image, and determining the center coordinate of the light spot according to the zero moment of the gray scale of a graph in a target region; S2, according to the covariance matrix CXY of the image in the X direction and the Y direction, obtaining two feature vectors and feature values of the covariance matrix CXY, so that the long and short semi-axis directions and the axis length of an ellipse corresponding to a heliostat light spot are obtained; S3, based on the two feature vectors of the covariance matrix CXY and the feature values of the two feature vectors, obtaining the heliostat light spot size through measurement. According to the invention, a background image of the light spot not on the target does not need to be collected, the light spot measurement efficiency is improved, a noise filtering threshold does not need to be assigned manually, and the standard of light spot measurement is improved.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a heliostat spot size measurement and device. Background technique [0002] Solar thermal power generation is a major way of utilizing solar energy at present. At present, solar thermal power generation adopts the method of tower solar thermal power generation. The tower solar thermal power generation system uses a heliostat that tracks the sun in real time to reflect sunlight to the heat absorber on the tower, and generates heat by heating the heat-absorbing working medium inside. High-temperature and high-pressure steam drives a turbogenerator to generate electricity. [0003] see figure 1 , the heliostat field is an important part of the tower solar thermal power plant system, and the heliostat field usually consists of thousands of heliostats. The optical accuracy of a heliostat is the degree to which the surface of the specified heliosta...

AI Technical Summary

Problems solved by technology

[0008] The existing technology has the following defects: due to the need to take background photos, the control system needs to cooperate with the shooting camera to repeatedly adjust the heliostat spot to the target and then move it out of the target in the scene where the optical accuracy needs to be measured at different times of the day. Increased the complexity of the control system; due to the limited rotation speed of the heliostat, it takes at least 20s to 1min to switch the heliostat spot on the target once, which determines the upper limit of the measurement frequency of the traditional measurement scheme; the noise filtering threshold The selection is generally related to the subjective judgment of the operator, and different measurement personnel often have disputes over the measurement results

Images