Development of a Photovoltaic Module Two-Diode Model for Studying Transients in the Solar Power Plant DC Network

Abstract

The aim of the study is to develop and verify the analysis model of a photovoltaic module (PVM) based on a two-diode mathematical model in the MATLAB/Simulink software environment. The trends of and forecasts for the further development of photovoltaic power plants are considered. The PVM mathematical model is described, and a procedure for obtaining the parameters that are not included in the PVM datasheet but necessary for implementing the analysis model is described. The developed analysis model is verified based on the datasheet parameters of the PVM simulated and with reference to the values of PVM currents, voltages and power at the maximum power point (MPP) that were obtained on the test installation in the course of its operation. A classification of faults in the PVM arrays is given. The obtained results will subsequently be used in the development of a photovoltaic power plant analysis model for calculating transients in PVM arrays during faults with taking into account the MPP tracking device operation for correctly selecting the protection devices in the PVM circuits and developing algorithms for detecting and isolating these faults. Based on the obtained study results, a conclusion has been drawn about the need to take into account the influence of the insolation level, temperature, and PVM degradation in calculating transients in a photovoltaic array.