Single DC-Sourced 9-level DC/AC Topology as Transformerless Power Interface for Renewable Sources

Juan R. Rodriguez-Rodríguez, Vicente Venegas-Rebollar and Edgar L. Moreno-Goytia
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Juan R. Rodriguez-Rodríguez: Instituto Tecnológico de Morelia, Morelia 58120, Mexico
Vicente Venegas-Rebollar: Instituto Tecnológico de Morelia, Morelia 58120, Mexico
Edgar L. Moreno-Goytia: Instituto Tecnológico de Morelia, Morelia 58120, Mexico

Energies, 2015, vol. 8, issue 2, 1-18

Abstract: This paper introduces an advanced transformerless multilevel hybrid-conversion topology intended for the interconnection of renewable DC sources at small-scale. The most important contribution presented in this paper is the generation of two isolated DC sources from a single DC source without the use of any type of transformer. The DC sources feed a nine-level DC/AC hybrid cascade multilevel converter. This advanced topology is achieved by redesigning the conventional DC/DC Buck topology, attached to the multilevel converter, and embedding a suitable switching strategy along with a Field Programmable Gate Array (FPGA)-based control. The advantages of the proposed structure, when compared to other proposals in the literature, are higher efficiency, reduced number of power switches, and high power density derived of transformerless characteristic. As a way to highlight differences and advantages of this converter over other options recently available in the literature, this paper carries out a quantitative evaluation comparing the number of voltage levels and the number of elements involved in the structure of DC/AC multilevel converters. The mathematical model and control strategy of the converter are explained and analyzed by means of simulations. Finally experimental results, obtained from a laboratory-scale prototype, show the performance of the system and demonstrate its relative advantages.

Keywords: multilevel converters; buck converter; cascaded cells; transformerless; micro-grids; FPGA control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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