On the ADRC Control of Dynamically Feedback Linearizable Systems: A Cascade Buck-Buck DC-DC Converter Example

This article addresses the control design problem for multivariable nonlinear systems in the particular case of dynamically feedback linearizable multiple input multiple output (MIMO) systems. The differential flatness property is used to establish the possibility of static feedback linearization on a suitably dynamically extended system, where linear ADRC loops are easily implemented on independent perturbed chains of integrations, modulo a Relative Gain Array treatment of the resulting input coupling matrix. The proposed approach is tested on an experimental platform, a Cascade Buck-Buck DC-DC power converter.