PWM-Based Adaptive Trajectory Tracking of Switched Buck Power Converters

Abstract

Based on pulse width modulation (PWM) technique, adaptive trajectory tracking of switched Buck power converters with parameter uncertainty is investigated in this paper. By the aid of the backstepping technique, an equivalent continuous adaptive tracking controller is designed to guarantee the asymptotic stability of the closed-loop error continuous system. For the switched Buck converter with unknown parameters, PWM-based adaptive tracking with the equivalent adaptive continuous control input is proposed such that the closed-loop error digital system is practically asymptotically stable, and the tracking error converges to an arbitrarily small neighborhood of the origin. Simulation results are shown to illustrate the effectiveness of the proposed new control schemes.

Review of Modern Control Technologies for Voltage Regulation in DC/DC Converters of DC Microgrids

“…Ref. [69] designed a digital control based on adaptive backstepping method that offers practically asymptotic stability to the closed-loop system of a buck converter. The tuning functions adaptive backstepping method is commonly used, since it avoids overparameterisation, which can result in complex, higher-order controllers [57,59].…”