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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Juan R. Rodriguez-Rodríguez & Vicente Venegas-Rebollar & Edgar L. Moreno-Goytia, 2015. "Single DC-Sourced 9-level DC/AC Topology as Transformerless Power Interface for Renewable Sources," Energies, MDPI, vol. 8(2), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:2:p:1273-1290:d:45573
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    References listed on IDEAS

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    1. Eliana Arango & Carlos Andres Ramos-Paja & Javier Calvente & Roberto Giral & Sergio Serna, 2012. "Asymmetrical Interleaved DC/DC Switching Converters for Photovoltaic and Fuel Cell Applications—Part 1: Circuit Generation, Analysis and Design," Energies, MDPI, vol. 5(11), pages 1-34, November.
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    Cited by:

    1. Benjamin Vidales Luna & José Luis Monroy-Morales & Manuel Madrigal Martínez & Domingo Torres-Lucio & Serge Weber & Patrick Schweitzer, 2021. "Analysis of Internal Signal Perturbations in DC/DC and DC/AC Converters under Arc Fault," Energies, MDPI, vol. 14(11), pages 1-16, May.
    2. Patricio Gaisse & Javier Muñoz & Ariel Villalón & Rodrigo Aliaga, 2020. "Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy," Sustainability, MDPI, vol. 12(15), pages 1-22, August.

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