Transformerless, 9-levels DC/AC hybrid topology based on single DC source, for renewable power applications

This paper introduces a novel transformerless multilevel hybrid conversion topology, presents as most important contribution the generation of two isolated DC voltage sources without transformers, for applications in DC/AC cascade hybrid multilevel converters. This is achieved by modifying the traditional DC/DC Buck converter topology; a suitable switching strategy is employed to regulate the isolated DC voltages Vc₁ and Vc₂ sources at the flying capacitors C₁ and C₂. The simulation, mathematical model of the converter and the experimental results obtained from the laboratory-scale version of shows the performance of the proposal and its relative advantages.