Introducing INEP PVSim: A Free Offline Application to Assess the Effects of Parameter Variations on the I-V Curves of Photovoltaic Modules

This paper introduces INEP PVSim, an offline application designed for teachers, students, and engineers to evaluate the behavior of photovoltaic (PV) modules. The application features a user-friendly interface that allows the simulation of I–V and P–V curves under different climate conditions, enabling real-time modification of parameters such as solar irradiance and temperature across a much broader range than typically provided in manufacturer datasheets. INEP PVSim is developed as free Python-based code and offers significant educational potential in the field of Power Electronics, as analyzing the impact of parameter variations on PV generation is often a challenging task with direct implications for power converter design. In addition to presenting the application, this paper also formalizes, in a single document, the equations and methods adopted for the implementation of the one-diode model, providing an accessible yet accurate platform for both learning and practical analysis.