Parameter Optimization of an Interval Robust Controller of a Buck Converter Subject to Parametric Uncertainties

Abstract

This paper presents the design and evaluation of an optimized interval controller of a buck converter. Uncertainties represent changes in the operating conditions of the system, resulting in degradation of performance of a conventional controller. To address this problem, an optimal robust controller is investigated, aiming to maintain acceptable dynamic performance throughout the range of permissible operating points. In order to maintain efficiency of control process at high level, the controller parameters are optimized by using the Chebyshev’s theorem as robust control technique that guarantees the minimization of the total deviation from the desired performance in a closed-loop system, specified by a family of characteristic polynomials. Simulation has been carried out using Matlab/Simulink. The results show that the optimized interval robust controller is able to maintain acceptable performance across the operating range, with a minor performance degradation compared to an interval robust controller and a conventional controller.