A simple method for predicting the output of dual-axis tracking systems from fixed-tilt system outputs

摘要

This paper begins by summarising a piece of work by the author which conducts a comparative analysis on the variability of fixed-tilt (FT) system and dual-axis tracking (DT) system. The results of this work revealed a relationship between the variability of the two systems associated with sun position. Consequently, a simple method for predicting the output of DT from FT output data was developed. The method is applied to the prediction of both magnitude and variability; the performance results of the method are presented and show it to be acceptable as an easily implemented prediction technique in the case where irradiance measurements at the sun's elevation angle are not available