Sun position tracking sensor

Abstract

Disclosed in the invention is a sun position photoelectric tracking sensor capable of measuring a precise position of the sun. Four photodiodes that are arranged symmetrically outside a shading cylinder are used to measure an offset between the incident light of the sun and a normal of a heat collecting surface preliminarily; and after processing by a microcomputer, a control signal is outputted, so that a great tracking visual angle is realized by the method. After the preliminary tracking is realized, an optical system is utilized to improve sensitivity of the sensor; the microcomputer carries out processing on a signal of a four-quadrant detector and control data are outputted; and fine tuning is carried out on the orientation of the heat collecting surface, thereby achieving an objective of sun position tracking with high precision. On the basis of detection of the sum of voltage values sensed by the four photodiodes, the sensor can carry out mutual switching between a working state and a non-working state with changing of illumination intensity, so that the sensor does not work at night and in rainy weather and only works under the circumstances of enough illumination intensity.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a sun position tracking sensor. Background technique [0002] Solar energy is a clean and durable energy with great development potential. Under the background of my country's policy of vigorously developing new energy sources, it is of great significance to study solar power generation technology. Solar energy has the characteristics of low energy density and constantly changing spatial position, so one of the key technologies for solar thermal power generation is to collect solar energy. In the process of using solar power to generate electricity, the sensor is used to accurately track the position of the sun, so that the solar energy collecting surface is always perpendicular to the incident light of the sun, and it is focused to a point to collect heat for power generation. Studies have shown that the heat collection system using real-time tracking technology of the sun pos...

AI Technical Summary

Problems solved by technology

This method is low in cost and high in reliability, but it cannot completely eliminate the cumulative error, and the tracking accuracy is only about 1°

At present, the sun position sensor using the photoelectric tracking method or the hybrid tracking method generally uses the principle of pinhole imaging, or the precision is high but the cost is high, and the cost is low but the precision is low, the cost performance is not high, and it also has the disadvantage of a small tracking angle of view.

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