New operation strategy for a grid-connected three-phase three-level NPC qZS inverter based on power losses

Carlos Roncero-Clemente, Enrique Romero-Cadaval, Oleksandr Husev, J. F. Martins

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper proposes a new operation strategy for a three-phase three-level neutral-point-clamped quasi-impedance source inverter in a grid-connected mode. The strategy is intended for any inverter based on impedance source networks where the shoot-through states allow a wider input operation range. This feature is commonly requested in photovoltaic applications due to variations in the level of irradiance. Converters of that family have different control variables or degrees of freedom that can be used to boost the input voltage. In the first step, focus was on possible control variables for the design of the control strategy to regulate the active/reactive power. We used a power losses analysis to determine the most suitable variables in each input voltage interval. Our detailed description for the design of the control strategy is based on the well-known relationship in an electrical system between P-δ and Q-V. Good performance of the full system was validated by simulations.

Original languageEnglish
Pages (from-to)60-65
Number of pages6
JournalElektronika ir Elektrotechnika
Volume22
Issue number3
DOIs
Publication statusPublished - 2016

Keywords

  • Distributed generation
  • Grid-connected algorithms
  • Impedance source inverter
  • Power losses

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