Desenvolvimento de um controlador híbrido fuzzy-PID de ordem fracionária aplicado a um conversor de tensão buck CC-CC

Abstract

This dissertation presents the proposal for a hybrid controller composed of a controller controlled by fuzzy logic and a fractional PID controller where it is applied to a DC-DC buck converter, and this development aims to demonstrate the potential of this type new composite controller, which is why this work presents the operating system of a fractional order PID controller, where its gains are scaled by a command that uses fuzzy logic and these gains are applied to control the voltage at the output of a converter DC-DC Buck, DC voltage step-down. In the project, the proposed approaches that use mathematical modeling for the Buck converter were used, the system references as input parameters of the Fuzzy system for adjustments of gains on tuning of the proportional-integral-derivative controller with fractional order and also, the approximation of operators from fractional order to integer order with studies of the behavior of functions in the domain of frequency, which are described in a computational environment where MATLAB, Simulink and LTspice were used, then the physical assembly of the device was carried out to carry out experimental tests and comparisons with the results of the simulations. In order to obtain a better elaboration of the hybrid controller, a characterization of the system's non-linearities was carried out through a mapping of the best tunes in three different operating regions of the plant. A performance analysis of the hybrid controller developed in closed loop was carried out to demonstrate the greater effectiveness of the approach used in the project in relation to conventional tuning strategies in this study project.