Modelling, identification and simulation of a 19.6kW PV power system based on SHARP ND-R245A5 polycrystalline silicon solar modules

A mathematical model aimed at simulation of 19.6kW PhotoVoltaic (PV) plant is presented in this research report. The PV plant under study consists of 4 panels connected in parallel each consisting of 20 (SHARP ND-R245A5) modules of 245W connected in series. Each module is formed by 60 silicon polycrystalline solar cells of 4.08W connected in series. The DC power produced by PV panels is converted to AC by a 20kW inverter (AURORA TRIO-20.0-TL-OUTD). The mathematical description of the whole PV plant relies on generalization of 1-Diode Model (1DM) widely adopted in literature to describe steady behaviour of single PV cells. PV cell temperature is described by combining two regression models correlating cell and module temperatures with air temperature, solar irradiance and wind speed as well. The PV inverter is simply described by means of conversion efficiency maps coupled to power derating curves in function of voltage and power generated by PV plant. Identification of model parameters and model validation are carried out by exploiting data provided by manufacturer (i.e. electrical and temperature data, power and current curves for different solar irradiance)