Image detection-based on-line detection and correction method of reflection angle of heliostat

Abstract

The invention discloses an image detection-based on-line detection and correction method of a reflection angle of a heliostat. Firstly, the heliostat to be corrected and a solar facula image in the heliostat are shot through a camera, the obtained image is processed, whether the solar facula image is positioned in the central position of the heliostat or not is judged, and if the solar facula image is positioned in the central position of the heliostat, the camera is aligned with the heliostat to be corrected; otherwise, the reflection angle deviation Theta of the heliostat is calculated according to the offset of the solar facula image from the central position of the heliostat, and a normal direction of the heliostat is controlled to rotate towards a direction in which the deviation is eliminated at an angle of half the Theta; and secondly, a declination angle Theta' between an angle for the camera to be aligned with the heliostat and an angle for the heliostat to be aligned with a heat collector is calculated, and the heliostat already aligned with the camera is rotated towards the heat collector for half the Theta'. By adopting the method, the heliostat can be accurately aligned with the heat collector when a static field is mounted, and errors caused by mechanical deformation and foundation settlement during long-term running of the static field can be corrected.

Description

technical field [0001] The invention belongs to the technical field of tower-type solar heat concentrating power generation systems, and in particular relates to an image detection-based online detection and correction method for the reflection angle of a heliostat. Background technique [0002] Solar power generation is divided into two forms: direct solar power generation and indirect solar thermal power generation, among which tower solar thermal power generation is an important method of indirect thermal power generation. Tower-type solar thermal power generation is to build a heat-collecting tower with a heat collector on the top, and arrange a large number of reflectors within a certain range under the tower. Through the reflectors, the solar radiation energy is concentrated on the heat collector to heat the working fluid, generating high temperature and high pressure. Steam, which then drives a generator to generate electricity. [0003] Since the incident angle of t...

AI Technical Summary

Problems solved by technology

Due to the huge number of heliostats, the workload of manual calibration is also very large, which delays the commissioning time of the solar thermal power station and increases the construction and operation and maintenance costs of the entire system

[0008] 2. When problems such as mechanical deformation or foundation subsidence occur in the heliostat frame, the actual reflection angle will change when the rotation angle of the frame shaft remains unchanged.

Due to the large number of heliostats, the cost of installing an optical measurement device for each heliostat is huge, and it is not easy to install and maintain, so it is not widely used

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