A Classification of Single-Phase Transformerless Inverter Topologies for Photovoltaic Applications

Md Noman Habib Khan, Mojtaba Forouzesh, Yam P. Siwakoti, Li Li, Tamas Kerekes, Frede Blaabjerg

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

5 Citations (Scopus)

Abstract

In Photovoltaic (PV) applications, a transformer is often used to provide galvanic isolation and voltage ratio transformations. However, a transformer based inverter is bulky and has high conduction losses, therefore lead to a reduction in the inverter efficiency. To overcome this issue, the transformerless inverter topologies are addressed widely, but the main challenge of a transformerless inverter is common mode issue. Numerous topological modifications with their control and modulation techniques makes them difficult to follow, generalize and highlight the advantages and disadvantages. To address the issue, this paper gives an overview on transformerless inverter and classify them into subsection to discuss the merit and demerit of some of the major topologies. Five subsections based on common mode behavior, voltage clamping and decoupling techniques have been demonstrated (i.e., common ground, mid-point clamping, AC-decoupling, DC-decoupling and AC+DC decoupling). To verify the finding and for general consensus, major transformerless topologies are simulated using PLECS. A general summary is presented at the end to stimulate readers to acknowledge the problems and identify solutions.
Original languageEnglish
Title of host publicationProceedings of 2018 IEEE Region Ten Symposium (Tensymp)
Number of pages6
PublisherIEEE Press
Publication dateJul 2018
Pages174-179
ISBN (Electronic)978-1-5386-6989-1
DOIs
Publication statusPublished - Jul 2018
Event2018 IEEE Region Ten Symposium (Tensymp) - Sydney, Australia
Duration: 4 Jul 20186 Jul 2018

Conference

Conference2018 IEEE Region Ten Symposium (Tensymp)
CountryAustralia
CitySydney
Period04/07/201806/07/2018

Keywords

  • Common mode voltage (CMV)
  • Leakage current
  • Single-phase photovoltaic (PV) systems
  • Transformerless inverter

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