3 research outputs found
Bidirectional irradiance transposition based on the Perez model
The Perez irradiance model offers a practical representation of solar irradiance by considering the sky hemisphere as a three-part
geometrical framework, namely, the circumsolar disc, the horizon band and the isotropic background. Furthermore, the simplified Perez
diffuse irradiance model, commonly known as the Perez transposition model, is one of the most widely adopted models in tilted irradiance
modeling. Although the set of model coefficients reported by Perez et al. (1990) is considered to be at an asymptotic level of optimization,
later analyses have shown that coefficients which are adjusted to local conditions may perform better than the original set.<p></p>
The model coefficients can be adjusted locally based on multiple datasets of diffuse and global irradiance on tilted and horizontal
planes. In this paper, we present a different approach to adjust the coefficients, by using only measurements of global irradiance on tilted
and horizontal planes from a tropical climate site, Singapore. A complete set of mathematical solutions to the inverse problem, i.e.,
irradiance transposition from tilt to horizontal, is also proposed. The data can then be used to generate irradiance maps from in-plane
irradiance measurements at photovoltaics (PV) systems. Such maps provide relevant information for PV grid integration.<p></p>