Output Feedback Discrete SMC Design For Quadratic Buck DC-DC Converter

Abstract

The purpose of this study is to design an output feedback sliding mode control for Quadrature Buck Converter(QBC) whose popularity has increased over the last decade owing to the increasing Maximum Power Point Tracking(MPPT) applications and growing power quality concerns in the industry. QBC is non-minimum phase and discontinuous system thanks to the switching components which makes it challenging to design a controller. The plant in Continuous Conduction Mode(CCM) is modeled by state-space averaging method. Output Feedback Sliding Mode Controller which is capable of controlling the plants with non-minimum phase characteristics is designed for the QBC in the face of process line voltage and load variations. The performance of the ODSMC controlled QBC during changing load and supply voltage is examined by means of numerical simulations that are done in Matlab/Simulink. Based on the results that are presented, the considerable disturbance rejection is achieved.