A NEW FIVE-PARAMETER MODEL FOR PHOTOVOLTAIC PANELS- DETERMINATION OF COMMERCIAL MODULES I-V CHARACTERISTICS

The current-voltage characteristics of a photovoltaic (PV) module can be reproduced representing the PV as an equivalent electrical circuit made of some linear and non linear components. The parameters describing such components are directly related to the performance characteristics of the specific PV panel, which are generally available in a graphic form with respect to standard values of temperature and incident radiation. In the paper, the feasibility of a new five-parameters model, already proposed by the Authors, is analysed. The equations system that describes the PV panel is solved in a non-approximate form because no simplified equation is needed. A clear explanation of the practical procedure used to find the parameters is given. The effectiveness of the new model is tested on some PV panels produced by primary international manufacturers for different conditions of irradiance and panel temperatures and the results show a very good correspondence with the data issued by the manufactures