Assessment of PV generation based on spherical irradiation measurements

Abstract

In this paper spherical irradiation measurements are exploited and  compared  to  power  output  in  order  to  assess  PV system  generation  potential.  Not  the  spherical  irradiation  as  a sum is measured, but irradiation referred to a specific solid angle. This  approach  enhances  generation  forecasting  for  predefined panel   orientations   within   urban   areas.   In   urbanised   regions sophisticated shadowing and reflexion patterns result generally in complicated generation predictions.