(in lingua inglese)
Results suggest that the effect of shading calculations based on an anisotropic sky model can have a significant influence in the calculated incident global irradiance over a tracker array. The isotropic assumption seems to underestimate the strong shading effects in the circumsolar and horizon brightening components. Shading of the albedo component by the tracker shades projected over the ground might have a noticeable impact on final yield predictions. Diffuse irradiance variability among different points of a single tracker is not considered by any commercial simulation software, yet might have the same order of magnitude as variability among different trackers; this effect could result in an additional irradiance mismatch contribution and thus be noteworthy for string layout and connection scheme optimization.