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The purpose of this work was to determine site specific coefficients (within the US) for use with the Perez diffuse irradiance model. The model predicts diffuse irradiance on tilted planes of any orientation for all insolation conditions, based on the knowledge of direct and global (or diffuse) irradiance. This is a component of SNLA's photovoltaic simulation program PVFORM. The model consists of (1) a pre-set geometric framework that describes the main non-isotropic features of sky radiance--circumsolar and horizon/zenith effects--and (2) an experimentally derived component that describes the variations of these anisotropic effects with weather conditions. A measurement program was initiated to provide the data necessary for (1) deriving the model's experimental component for several US locations, (2) comparing model configuration and evaluating performance at these locations and (3) evaluating site dependency and recommending, if justified, model configurations adapted to particular environments/climates. Five environmentally distinct sites were selected based on their potential impact on model performance. In addition, work was performed to improve sky condition parameterization and eliminate all unjustified complexities of the original model. The main results of this work are the following: (1) the model algorithm has been greatly simplified while conserving original accuracy, (2) the physical soundness andmore » effectiveness of the insolation parameterization method have been improved, (3) one unique model, with a fixed set of coefficients, has been shown to be sufficiently accurate to describe sites within the US. 22 refs., 19 figs., 14 tabs.« less

The development and verification of the Perez diffuse radiation model