Análise, modelagem e controle de conversor CC-CC half bridge com estratégia de modulação PWM para interruptores conectados em paralelo

Abstract

Technological advances have been introducing and popularizing in society the use of electric vehicles, photovoltaic generation systems, uninterruptible power supplies (UPS), and many other systems that rely on energy storage elements. Faced with this market demand, a new trend has emerged in the field of power electronics, of DC-DC converters capable of transporting power flow in both directions, the so-called bidirectional converters, which bring the practicality of covering two systems in only one. In this context, the present work presents a study with analysis, modelling and digital control of a bidirectional converter operating in continuous conduction mode, with results validated via simulation, using the software PSIM. For the analysis, the current and voltage in each component of the proposed topology were ploted, as well as the sizing of each component of the converter. Using the concept of average value, a small-signal average model was obtained for output voltage and inductor current in the face of disturbances in the duty cicle. Finally, the models obtained were used to tune analog and digital controllers, making a comparison between the load step response of the open-loop system and the closed-loop system, for analog and digital control techniques.