Nonlinear disturbance observer based sliding mode control for PWM-based DC-DC boost converter systems

This paper investigates a nonlinear disturbance observer (NDOB) based sliding mode control (SMC) approach for PWM-based DC-DC boost converter systems subject to resistance load disturbances and input voltage variation. By designing a novel sliding mode manifold incorporated with a disturbance estimation technique, a NDOB-based SMC method is designed for these systems. A rigorous stability analysis is presented. As compared with the nominal SMC method, the proposed method obtains a better disturbance rejection ability when the resistance load and input voltage are varying. Simulations comparison results are provided to verify the effectiveness of the proposed control method.