| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 100 === The amount of power generated by a solar cell is highly related to the angle of the solar panel and sunlight incident. The solar system can effectively generate a maximal amount of electricity when the solar panel is vertical to the sunlight. There are two commonly used methods to track the sun path, which are installing a photo-sensor on the track, and applying a sun trajectory formula. However, installing a photo-sensor exactly parallel to solar module and determine an accurate initial tracking point are difficult. The installing bias and locating bias may cause the solar module being not able to directly receive the sunlight. In addition, the shape of solar module may be different from the original one after a lone time used. The bending shape of the solar module not only leads to the decreasing efficiency of generating electricity, but also the higher maintenance cost.
This study proposes a sun path tracking method based on the short-circuit current and the sun trajectory formula. Without the influence of cloud, the short-circuit current of a solar cell can be used as a tracking signal which can detect the sunlight and find the best location with highest efficiency for generating electricity even though the solar module becomes out of the original shape. When the sunlight is insufficient, a sun trajectory formula is adopted to tracking the sun path. Thus, without using the photo-sensor, there is no installing problem happened in this proposed method.
A comparison between the performance of the controller which adopts the proposed method in this study and the performance of the controller product sold in market with a photo-sensor for tracking sun path is presented in this study. By installing the two controllers on a same sun tracker, the experiment results show that the proposed method can perform as well as the controller product which has been sold in market.
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