Hybrid converter based on Ćuk topology to supply both AC and DC loads

Abstract

Residential power systems are getting modernized due to the increased penetration of power electronic systems. Modern nanogrid architectures usually serve to interface both DC as well as AC loads with different kinds of energy resources. This paper proposes a Ćuk-derived hybrid converter (Ćuk-DHC) procured from the conventional Ćuk topology, where the single power electronic switch is replaced with a voltage source inverter bridge network. The resulting converter employs lesser number of switches to produce DC and AC outputs simultaneously. A major advantage of this hybrid converter is that it has immanent shoot-through protection in the inverter stage making it reliable for modern compact smart residential power systems. Moreover, being a derived converter, it holds the advantages that a conventional Ćuk converter possesses. Operating modes and the steady state analysis of the proposed converter have been studied in this paper. A modified unipolar sine pulse width modulation (PWM) technique is used as the control strategy for the operation of the hybrid converter. The characteristics and operation of the proposed converter has been validated through simulation. For improving the output gain factor, a switched inductor cell based modification has been imposed on the hybrid converter to upgrade both dc as well as ac gains and the same has been affirmed via simulation.