The Research Of Large Range Sun Ray Tracing Sensors And Tracing Measures

In the solar application system, a solar-tracing device which is simple, inexpensive, but with high precision is being sought. The problem of large range tracing is discussed in this thesis. Then a tracing device composed of light sensors and MCU is developed.The tracing of the sun and kinds of working states of the tracing-devices are discussed in this thesis. Analyzing the characteristics of tracing devices being used in kinds of solar generation systems, a tracing device—two level tracing sensors is designed. Exact orientation tracing can be achieved in the limited angle range with one traditional group of sensors. To enlarge the tracing range, another group of sensors should be added which can carry out rough orientation tracing. When the included angle between the axis of tracing sensors and sun ray is very large, rough orientation sensors start working until the included angle is in the range of exact orientation tracing. Then exact orientation sensors start working until the axis is parallel with the sun ray. As a result, a large range and high precision tracing are realized by the two level tracing sensors.According to the analysis of kinds of functions possessed by the sensor-tracing device, hardware and software design has finished. A simple tracing device is made to make some experiments with the two level tracing sensors, the interpretation of which is that the tracing precision can achieve 22 " and the tracing range is 180° both in elevation and azimuth. At last, control strategies of sensors are designed according to different kinds of weather status, so that the sensors can work steadily in such weather status.This two level sensor-tracing device is not only inexpensive, but also with simple structure, which can be used in concentrical photovoltaic solar energy generation, disk solar energy thermal-generation and tower solar energy thermal-generation.