Behavior Analysis of PV Modules Subjected to High-Frequency Current Ripples

In this paper, the behavior of the photovoltaic module (PV) when connected to switched circuits is verified. The switched circuits drain non-pure DC and cause oscillations that are reflected in the generated energy. Initially, the PV dynamic model and reverse bias characteristics were considered. These characteristics affect operate of the PV module in cases of shading, faults, and high-frequency applications. From this, a approximated photovoltaic model was proposed. DC and AC sources were used to reproduce the drained current. These sources were configured with current values close to the MPP. This study developed a mathematical analysis of the proposed model based on the dynamic characteristics and the use of a filter capacitor at the module output. A simulation was performed using PSIM® software with the characteristics of a 210-Wp PV module. The generated photovoltaic current oscillations were verified according to the use of filter capacitance. In which it was calculated from the small-signal AC analysis of the proposed approximated PV model. The output power ripple of the module was analyzed.