Control and Local Stability Analysis of a DC-DC Converter Feeding Distributed Power Systems

Abstract

In this paper a detailed analysis is undertaken to explore the stability and bifurcation pattern of the nonlinear phenomena in the Buck DC-DC converter leading to a better understanding of its dynamics. First a nonlinear system modelling is derived for open-loop Buck converter. This model is then extended for the closed-loop system implementing a proportional - integral (PI) compensation scheme. After the initial analysis of this converter and stability region identification, we utilize the MATLAB package to analyze the detailed bifurcation scenario as the parameters are varied. The simulation was performed to achieve satisfactory dynamic performance. Finally, we propose a sliding mode controller for the proposed converter. The main goal of the control system is to regulate the output voltage and to eliminate the high current ripples.