Sun-tracking detector having wide-angle capturing and precise tracking functions

Abstract

The invention provides a sun-tracking detector having wide-angle capturing and precise tracking functions. In the sun-tracking detector, two sets of photosensors are adopted, wherein one set of photosensors is used for wide-angle low-precision tracking; and the other set of photosensors is used for high-precision positioning and tracking. In case of a large tracking angle difference, the sun-tracking detector firstly performs the wide-angle low-precision tracking, and then automatically performs the high-precision positioning and tracking to lock the tracking target (the sun) when the tracking error is reduced to a certain value. The sun-tracking detector comprises four triangular pentahedron brackets which are mounted on a base to form a well, wherein the well is positioned in the center of the base, four walls of the well form four shading regions, four small rectangular grooves are arranged in the centers of four sides at the bottom of the well to form four light-guiding holes, four photoresistors are correspondingly arranged at the four small rectangular grooves at the back side of the base, the sunlight can irradiate the four photoresistors by penetrating through the four small rectangular grooves, the four photoresistors and potentiometers composing an elevation angle and azimuth angle detecting circuit are mounted on a circuit board at the back side of the base, and four photosensitive cells are affixed onto the sloping planes of the four triangular pentahedron brackets and are used for wide-angle capturing. The four triangular pentahedron brackets and the circuit board are mounted on the base to form a whole, thus composing the sun-tracking detector having the wide-angle capturing and precise tracking functions. The sun-tracking detector has a detection angle more than 180 degrees, can not lose a tracking target (the sun) within the all-day tracking time and has the characteristics of simple structure, small volume and low cost, and operation is reliable.

Description

technical field [0001] The invention belongs to the field of solar energy applications, and in particular relates to a tracking sun detector in a dual-axis automatic tracking CPV (concentrating photovoltaic) power generation system and a tracking control system of a solar thermal power generation system requiring precise tracking. Background technique [0002] The two-axis automatic tracking CPV power generation system needs to track the sun accurately, so that the concentrated sunlight can always shine on the CPV cells, and the CPV power generation system can generate electricity normally. There are two types of automatic sun tracking technology: time control method and light source detection control method. The time control method is affected by the location of the power station and the nonlinearity of solar motion, the tracking accuracy is not high, and the debugging is complicated. It is generally used for automatic tracking of PV power generation systems. The light sou...

AI Technical Summary

Problems solved by technology

In order to prevent losing track of the target sun, it is necessary to add time control tracking sun technology as an auxiliary tracking, which increases the complexity, failure rate and power consumption of the system

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