Design of a Transformerless DC Regulator with Reduced Redundant Power Processing for a Residential DC Microgrid

The current energy requirements of the residential, industrial, and commercial sectors are met by direct current (DC) electronic loads. Distributed generation (DG) systems which use photovoltaic systems, domestic wind generators, and grid integration, require maximizing energy transfer efficiency in these systems. The DC/DC converters integrated as interfaces between different sources of DG systems have the function to optimize the energy transferred to the DC bus. This paper proposes integrating a Quadratic Buck converter with reduced power processing as an interface between DG system sources and the DC bus. The design and operation of the converter in continuous conduction mode, as well as its average and linear models, are presented. The analysis of the reduced redundant power processing in the converter is also provided, along with the design of the DC bus voltage regulator.