Abstract
Abstract. Many transposition models have been proposed in the literature to convert solar irradiance on the horizontal plane to that on a tilted plane. The inverse process, i.e. the conversion from tilted to horizontal is investigated here based upon seven months of in-plane global solar irradiance measurements recorded on the roof of the Royal Meteorological Institute of Belgium's radiation tower in Uccle (Longitude 4.35° E, Latitude 50.79° N). Up to three pyranometers mounted on inclined planes of different tilts and orientations were involved in the inverse transposition process. Our results indicate that (1) the tilt to horizontal irradiance conversion is improved when measurements from more than one tilted pyranometer are considered (i.e. by using a multi-pyranometer approach) and (2) the improvement from using an isotropic model to anisotropic models in the inverse transposition problem is not significant.
Highlights
The usual solar radiation parameters measured on ground are the global horizontal irradiance, Gh, the direct normal irradiance, Bn, the diffuse horizontal irradiance, Dh and the sunshine duration
The aim of the present study is to (1) evaluate the tilt to horizontal irradiance conversion when using for model input Gt measurements recorded in angular configurations similar to those encountered in Belgian PV systems installations and, (2) determine if, as suggested by Yang et al (2014), the use of a multipyranometer system could improve the conversion accuracy
When only a single tilted sensor is used, the conversion can be carried out with a decomposition model coupled with a transposition model to solve the inverse transposition problem
Summary
The usual solar radiation parameters measured on ground are the global horizontal irradiance, Gh, the direct normal irradiance, Bn, the diffuse horizontal irradiance, Dh and the sunshine duration. They are recorded by means of networks of meteorological stations. The recent deployments of solar photovoltaic (PV) systems offer a potential opportunity of providing additional solar resource information as PV systems with global tilted irradiance, Gt, measurements become available in some locations. In most PV systems, modules are installed on a fixed plane to reduce installation and operation costs compared to tracking systems. Gh estimates at the PV system location requires to convert the tilted solar irradiance recorded to that on a horizontal plane
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