Finite-time control for DC-DC boost converter using nonsingular terminal sliding modes via exact feedback linearization

This paper investigates a finite-time disturbance observer (FTDO) based nonsingular terminal sliding mode control (NTSMC) approach for DC-DC boost converter system. By using exact feedback linearization theory and control method to solve the output voltage regulation problem under the load resistance changes and external input voltage variations. Integrating the disturbance estimated by FTDO into the design of the nonlinear dynamic sliding mode surface, a finite-time NTSMC method is developed to reject the effects of mismatched disturbances and achieve finite-time tracking performance. As compared with the nominal NTSMC method, the proposed method obtains a better disturbance rejection ability no matter the disturbances satisfy the matching condition or not. It is shown that the stability of closed-loop system can be guaranteed by the proposed method. Simulations comparison results are displayed to demonstrate the robustness of the proposed controller against input voltage variations and load uncertainties.