Abstract

The advancement of power electronics field today has allowed us to generate new technologies in various areas such as renewable energies, energy storage systems with batteries, electric chargers, electric vehicle traction systems, and more. New technologies are increasingly demanding in terms of accuracy of system variables; for this, advanced control methods are applied, and this requires a model that correctly represents the operation of the system. The models of power converters are not trivial; therefore, this paper proposes to model a ThreeLevel Flying Capacitor Buck DC-DC Converter using the bond graph technique, which is a multiphysics modeling tool based on the electrical domain that will facilitate the comprehensive modeling of the system. In addition, the obtained model from the bond graph approach can be directly linked with a Port Hamiltonian System, to obtain a physical representation of the system and based on the conservation of energy. Moreover, results are presented with a proposed non-linear closed-loop control model decoupling the voltage and current dynamics of the multilevel converter. The obtained dynamic results demonstrate the good performance of the proposed modeling methodology. © 2024 IEEE.