Abstract

This study is concerned with the output feedback control design for a class of non-linear systems subject to multiple sources of disturbances/uncertainties including parameter perturbations, complicated non-linear dynamics and external disturbances. By developing the high-order sliding mode observer, both state and disturbance observations are incorporated into the controller design. By means of the lumped disturbance estimation as well as virtual state estimations, a composite output feedback controller combined with an additional feedforward compensation is proposed. The stability of the closed-loop system is rigorously demonstrated based on Lyapunov stability criterion. Application of the proposed approach to a single-phase DC-AC inverter system is finally implemented with experimental results to validate the feasibility and effectiveness.

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