A port-Hamiltonian Modelling and Controller Design Approach for Cascode Buck-Boost Converter

By using cascode technique, a buck boost converter can provide higher step-up voltage than the conventional does at the same duty ratio. Because of having non-linear variable structure and a zero on the right half plane, the cascode buck-boost becomes a challenging topic for control engineering. In this paper, an energy-based model of the converter is created and a controller design method using port-Hamiltonian is proposed. The developed controller is suitable for the non-linear system with variable structure, since the simulation results show the remarkable achievement of the proposed controller in command tracking and disturbance rejection. In addition, it can effectively treat the non-minimum phases issue of the converter.