A novel composite control for DC-DC Boost converters based on fast super-twisting algorithm

In this paper, a novel dual-loop control scheme is proposed to improve the voltage tracking performance of DC-DC boost converters. According to the conventional super-twisting algorithm, a new modified fast super-twisting algorithm (FSTA) is developed which is introduced in the strategy to enhance the convergence performance. On the basis of FSTA, a second-order sliding mode controller is designed in the inner current loop. The outer voltage loop controller consists of a nonlinear PI controller and a fast super-twisting sliding mode observer, which generates the reference current value. The uncertain terms are estimated by the fast super-twisting sliding mode observer and compensated to the outer voltage loop. Simulation results are carried out to confirm the effectiveness and superiority of the proposed control strategy.