Feedback linearizing control of a magnetically coupled multiport dc-dc converter for automotive applications

This paper presents a feedback linearization-based control strategy for a a magnetically coupled multiport dc-dc converter aimed at automotive applications. Essentially, a transformation of control and state variables is proposed in such a way that the resulting system becomes linear and decoupled. Then, a conventional PI controller is devised that renders asymptotic stability, as well as robustness to resistive load uncertainty and presence of constant power loads. The inversion of the control transformation, which involves nonlinear terms, is carried out using linear approximations with no significant performance decay. Hence, simplicity and efficiency are the main features of the control design. The proposal is validated via realistic numerical simulations.