Projeto de controladores robustos sujeito a falhas no atuador: uma aplicação ao conversor buck-boost

Abstract

The dc-dc converters are designed to control the power flow from an input source to an output source. For such proposal, composed circuit of switches and other passive elements were used, which by their turn, characterize the system mathematical model. For this essay, Buck-Boost converter study will be proposed, aiming for the analysis of its response in steady regimen after the simulation of a channel controller failure, through mathematical modeling in spaces state. This way, an uncertain polytopic type system will be obtained, which will consist on the following uncertain parameters: actuator failure assumption and duty-cycle switching. The robust stability for this system will be granted by the theorem of Aleksandr Lyapunov that, in its turn, depends on parameters obtained from a set of linearmatrix inequalities (LMIs), which sets the state feedback gain value that answers forthe specifications imposed on the system. The closed loop electronic circuit described above will be simulated through electronic simulation computational tool PSIM to verify the converter behavior and the designed controller.