Open AccessCorrection Procedures for Temperature and Irradiance of Photovoltaic Modules: Determination of Series Resistance and Temperature Coefficients by Means of an Indoor Solar Flash Test Device
Author(s) -
Silvia Luciani,
Gianluca Coccia,
Sebastiano Tomassetti,
Mariano Pierantozzi,
Giovanni Di Nicola
Publication year - 2021
Publication title -
tecnica italiana
Language(s) - English
Resource type - Journals
ISSN - 0040-1846
DOI - 10.18280/ti-ijes.652-419
Subject(s) - photovoltaic system , irradiance , equivalent series resistance , flash (photography) , solar irradiance , temperature coefficient , power (physics) , solar simulator , series (stratigraphy) , radiation , maximum power principle , materials science , voltage , environmental science , nuclear engineering , electrical engineering , computer science , optics , engineering , physics , meteorology , thermodynamics , paleontology , biology
The comparison between I-V (current-voltage) curves measured on site and I-V curves declared by the manufacturer allows to detect decrease of performance and control the degradation of photovoltaic modules and strings. On site, I-V curves are usually obtained under operating conditions (OPCs), i.e. at variable solar radiation and module temperature. OPC curves must be translated into standard test conditions (STCs), at a global irradiance of 1000 W/m2 and a module temperature of 25 °C. The correction at STC conditions allows to estimate the deviation between the power of the examined module and the maximum power declared by the manufacturer. A possible translation procedure requires two correction parameters: Rs’, the internal series resistance, and k’, the corresponding temperature coefficient. The aim of this work is to determine the correction parameters carrying out specific experimental tests as indicated by IEC 60891. A set of brand-new photovoltaic modules was experimentally characterized determining their I-V curves by means of an indoor solar flash test device based on a class A+ AM 1.5 solar simulator. Using the OPC I-V curves, obtained at several conditions of irradiance and temperature, it was possible to determine the correction parameters of the photovoltaic modules being considered.