Finite Control Set Model Predictive Control of Noninverting Buck-Boost DC-DC Converter

Abstract

In this paper, finite control set model predictive control (FCS-MPC) of the noninverting buck-boost DC-DC converter with magnetic coupling between input and output is proposed. A major issue that arises in the classical control of the converter is the dead zone near the transition of the buck and boost mode. The reason for the dead zone is practically unrealizable duty cycles, which are close to zero or unity, of pulse width modulation (PWM) near the transition region. To overcome this issue, FCS-MPC is proposed to use. In FCS-MPC, the switches are manipulated directly by the controller without the need of PWM. Thereby, avoiding the dead zone altogether. Simulations of the proposed FCS-MPC technique on the converter show that the dead zone has been successfully avoided. Moreover, simulations show that the FCS-MPC technique results in a significantly improved performance as compared to the classical control techniques in terms of response time, reference tracking, and overshoot.