A generalized active disturbance rejection control method for nonlinear uncertain systems subject to additive disturbance

This paper investigates a generalized active disturbance rejection control framework for a class of uncertain nonlinear systems subject to additive disturbance. First, a new extended state observer with less dependence of the system information is developed which will enable an easy-transplantable characteristic for nonlinear systems with variable nonlinearity restrictions. Then integrating with an output feedback domination technique, an effective disturbance attenuation law is designed to handle a wider class of systems whose nonlinear items may go beyond the strict-feedback structure and Lipschitz continuity requirement. A rigorous stability analysis is also carried out with a semi-global output feedback control objective. Numerical simulation results and an application into a DC–DC buck power converters demonstrate the feasibility and improved control performance of the proposed method.

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