Conversor cc-cc de alto ganho estático cuk com característica de fonte de corrente para aplicação em nanorredes

Abstract

A high gain DC-DC converter based on the topology classic CUK converter, designed for nanogrid application, is presented in this paper. The proposed converter is composed of two winding coupled inductor and voltage multiplier cells with switch capacitors in order to achieve the high step-up voltage gain. Furthermore, the converter features current source characteristics at the input and output, which differs from conventional high gain converter topologies. To validate the proposal a prototype circuit with input voltage 24 V, output voltage 380 V, and rated power 200 W is operated to verify its performance, which presented a maximum efficiency of 95.3%. The converter has a photovoltaic (PV) module as its primary source of energy. However, after analyzing the behavior of the PV module under conditions of climate change, it has been verified that its characteristics are altered, which causes power losses. In order to track the maximum power of the photovoltaic module and reduce these power losses, an MPPT (Maximum Power Point Tracking) algorithm was used.