Modeling and control of a push-pull converter for photovoltaic microinverters operating in island mode

C. L. Trujillo, D. Velasco, E. Figueres, G. Garcerá, R. Ortega

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

This paper presents the modeling and control of a push-pull converter integrated into a two-stage photovoltaic microinverter operating in island mode without backup energy storage components (batteries). A push-pull small signal model is presented, from which they are derived all transfer functions needed to implement the controllers that regulate the output current, input voltage and output voltage interacting with the MPPT algorithm. A significant contribution of the paper is the proposal of an innovative control structure that simultaneously regulates in island mode both the ac voltage and the dc voltage of the panels, in order to place it in the best operation point. Such operation point is calculated by a specific control loop that interacts with the MPPT algorithm. To validate the proposed concept, simulations in PSIM™ were carried out.

Original languageEnglish
Pages (from-to)2824-2834
Number of pages11
JournalApplied Energy
Volume88
Issue number8
DOIs
StatePublished - Aug 2011

Keywords

  • Distributed Generation
  • Microinverters
  • Photovoltaics Panels
  • Push-pull

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