| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 96 === Increasing the solar cell’s efficiency while reducing the cost of solar cell is the main focus of the research of photovoltaics technology. High concentrated photovoltaic (HCPV) system uses III-V solar cell, have a great potential of reducing the cost of electricity power in next ten years. However, the III-V solar cell only absorb the direct solar irradiation and it needs to be mounted on a solar tracker with high accuracy.
In this study, an experimental solar tracker is designed and tested its passive tracking performance at outdoor. The general requirement of photovoltaics system is introduced first and the necessity of high accuracy of solar tracker is highlighted for coping with HCPV. Next, the process of mechanism design with the Pro-E software is described. This tracker can support a solar panel with 30 kg, and rotate with the range of azimuth and altitude ±120° and 0°-90°, respectively.
Calibrating procedure in the horizontal position and south-north orientation is performed before the outdoors test. Then a collimating tube with 0.1° precision is used to measure the off-tracking angle. Result shows that the average off-tracking angle is about 0.31° and maximum off-tracking angle is about 0.6°. This demonstrates the feasibility of the passive sun tracker can be used in HCPV system with an optical module of 1° acceptance angle.
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