Modelagem e controle de conversores CC-CC das topologias Buck-Boost e Cúk

Abstract

The transition of the world energy matrix, in view of the sustainability in several environmental production, promote the development of technologies jointly with efficiency in energy generation, specifically electricity. Among the sources that use natural resources to generate electricity, solar photovoltaic energy has as one of its dependencies the radiation of the Sun. Given this, a study is performed in the area of modeling CC-CC converters, with the intention of practical integration of this converter to a solar photovoltaic system for battery recharging. The recharge of a battery in a solar photovoltaic network demands the presence of electronic devices able to control the power transmitted to the battery. These devices, called charge controllers, have technologies linked to the area of control and power electronics for the purpose of controlling the flow of energy in a recharging process. Such control is necessary since the solar photovoltaic panel, due your dependence on external factors, does not give a constant power to the load. This work presents the modelling of two topologie of CC-CC converters, Buck-Boost and Cúk. From these topologies a medium model is validated using the model of the switched converter. Whereas the model´s result is not linear, the process of linearization of differential equations is employed for get a linear model of the process. This model that describes the physical behavior of your system. The PID controller design and its discretization are also presented. Finally, the proposed control system will be implemented in a microcontrolled electronic system. [resumo fornecido pelo autor]