CONTROLLER DESIGN FOR A BOOST CONVERTER USING CONSTRAINED STABILITY BOUNDARY LOCUS

Abstract

Due to rising demands for clean energy, transition from conventional sources to renewable sources of energy is also rising. The integration of the renewable energy sources to high voltage dc bus has necessitated the use of DC DC boost converters. The intermittency of these sources can be countered effectively by the closed-loop operation of the converters. The design of the controller is critical as it provides converter with good dynamic response, and effective voltage regulation against source and load disturbances. This article aims to provide a simple, analytical, and graphical way to tune the PI/PID type controllers. The controller parameterization is done on the basis of obtained stability boundary locus which is further constrained by the boundaries obtained for gain margin, and phase margin providing the controller sufficient robustness to uncertainties. The analytical study is supported with the MATLAB simulations. A 24/110 V, 100 W boost converter has been designed and simulation results are also provided.