Abstract
High concentration photovoltaic modules allow a significant increase in the electric power produced per unit area. Nevertheless, in order to reach the maximum possible increase in performance, the sun tracker must meet severe specifications regarding sun-pointing accuracy, because the lens-cell sets of the solar modules only work in a very small angle. For the sun tracker to meet these requirements, a precise procedure of installation is necessary in order to minimize errors from different sources such as misalignment of the structure with respect to geographical North, misalignment of the solar modules with respect to the wing of the sun tracker and other structural tolerances. This paper presents an auto-calibration algorithm which allows to work with higher tolerances in the installation process by estimating some sources of error instead of spending installation time trying to minimize them. Simulation and experimental results with a testing sun tracker are exposed showing the benefits of the proposed method with respect to a manual calibration in terms of power performance.
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