Pre-computed GPC of a DC–DC buck converter

摘要

This study presents the control mechanism of a DC-DC buck converter using generalised predictive control by approximating the plant model to a stable first-order plus dead time (FOPDT) model. As most of the higher order plant dynamics can be represented by an FOPDT model, this study is limited only to a stable FOPDT dynamics system. In this work, a relation between FOPDT model parameters and weights of the cost function is derived. The controller design procedure is then verified by implementing voltage mode control of the DC-DC buck converter in the case of inactive constraints. Jury's stability criteria are used to analyse the stability of the closed-loop system. The implemented algorithm is then verified using simulation in MATLAB/Simulink, as well as the hardware implementation of the pre-computed control algorithm.