Double voltage step-up photovoltaic microinverter

Diana Lopez, Freddy Flores-Bahamonde, Hugues Renaudineau, Samir Kouro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)

Abstract

In conventional photovoltaic microinverters configuration, a single PV module is connected to the grid through two converter stages: a step-up dc-dc stage and a step-down dc-ac stage. In the first stage, a high frequency transformer is generally used to achieve the high step-up voltage ratio conversion to a voltage above the grid peak value, reducing the converter efficiency while increasing its size. More recently single-stage step-up dc-ac configurations have been proposed to overcome these problems. However, they increase control complexity, and efficiency remains an issue due to the high step-up ratio required and being a single stage. Therefore, a two-stage configuration consisting of two consecutive step-up converters is proposed in this paper. With this scheme, it is possible to distribute the elevation effort to improve the global efficiency of the PV microinverter. The proposed topology merges a traditional boost dc-dc converter for the first stage, like in the conventional configuration, but operating with a below-grid-peak-voltage dc-link voltage. A step-up inverter is used for the second stage; it is composed of two boost converters connected in differential mode (dual boost inverter). Simulation results are provided to validate the proposed configuration.

Original languageEnglish
Title of host publication2017 IEEE International Conference on Industrial Technology, ICIT 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages406-411
Number of pages6
ISBN (Electronic)9781509053209
DOIs
Publication statusPublished - 26 Apr 2017
Externally publishedYes
Event2017 IEEE International Conference on Industrial Technology, ICIT 2017 - Toronto, Canada
Duration: 23 Mar 201725 Mar 2017

Publication series

NameProceedings of the IEEE International Conference on Industrial Technology

Conference

Conference2017 IEEE International Conference on Industrial Technology, ICIT 2017
Country/TerritoryCanada
CityToronto
Period23/03/1725/03/17

Keywords

  • Microinverter
  • Photovoltaic energy
  • Step-up inverter

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering

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