| dc.description.abstract | Because the solar tracker can control the direction of solar cell modules to the sun for increasing the power generating efficiency, it is widely applied in solar power generation. Although there are various types of trackers due to different tracking methods, various errors of solar trackers, including manufacturing errors, assemble errors and installation errors, can not be ignored. These errors affect strongly the solar trackers with passive control system. If these errors can not be eliminated, the tracking accuracy will decrease. Especially the acceptance angle of concentrated photovoltaic (CPV) cells is about 0.5°, so that the tracking error of trackers must be less than 0.5°. The goal of this research is to identify the system errors of the passive controlled tracker in tilt-roll type by using a position sensitive detector (PSD) measure the tracking angular error. And afterwards, the tracking algorithm can be modified with such errors so as to increase the tracking accuracy.
Only the system errors of the tilt-roll tracker, including both the aligning error to north meridian and the tilting error of the main axis, initial position error for tilting mechanism and original position error of PSD, are considered in the thesis. In order to identify these errors, the tracking errors are measured by using a PSD. The results of the conducted experiment show that tracking error of the compensated algorithm is about 0.2°, less than 1.2° by tracking without compensation. It indicates that the compensation method proposed in the thesis can improve the tracking accuracy of concentrated photovoltaic trackers. | en_US |