Dynamic Feedback Linearization and Singular Perturbation for a Stabilizing Controller for DC/DC Boost Converters: Theory and Experimental Validation

The current massive integration of constant power loads (CPLs) requires better dynamic performance in direct current (DC) microgrids. This imposes the needs for more advanced controllers for DC/DC converters, and especially for boost ones because of their nonminimum phase property. This article contributes to this research line and proposes an advanced nonlinear (NL) control strategy for the output voltage stabilization of boost converters using singular perturbation and dynamic feedback linearization strategies. The proposed techniques manage to impose a desired stable dynamics for the variable with the nonminimum phase characteristics, thus avoiding the problem of possible selection of unstable equilibria. At first, a theoretical proof of the stability of the close loop system with the proposed controller is provided. Then, an experimental validation composed by four case studies is performed. The results show good adaptability to a wide range of operating conditions and better performance regarding voltage tracking and load disturbances rejection of the proposed NL method with respect to classical control techniques.