A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter with Less Leakage Current

Naser Vosoughi Kurdkandi, Milad Ghavipanjeh Marangalu, Shamim Mohammadsalehian, Hadi Tarzamni, Yam Siwakoti, Md Rabiul Islam, Kashem M. Muttaqi

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications. Additional significant features include-reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability. Moreover, the proposed topology provides full reactive power support to the grid. A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter. Finally, the performance of the proposed inverter is validated by the 770 <italic>W</italic> laboratory prototype.

Original languageEnglish
Pages (from-to)63736-63753
Number of pages18
JournalIEEE Access
DOIs
Publication statusPublished - 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Capacitors
  • Inverters
  • leakage current limitation
  • Leakage currents
  • photovoltaic application
  • Switches
  • Topology
  • Transformer-less inverter
  • Transformers
  • Voltage
  • voltage boosting ability

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