A Symmetrical Transformerless Hybrid Converter with Leakage Current Suppression

Zhongting Tang, Yongheng Yang, Mei Su, Hua Han, Frede Blaabjerg

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

2 Citations (Scopus)

Abstract

Considering the high efficiency and flexibility, the transformerless hybrid converters with multiple outputs attract more and more attention in residential PV applications. However, the leakage current issue should be addressed properly to meet certain stringent safety regulations and standards. In this context, this paper presents a new symmetrical transformerless hybrid converter with simultaneous AC and DC outputs, while at the same time suppressing the leakage current. More specifically, a symmetrical boost-filter inductor is employed in the proposed converter to maintain a constant common mode voltage. The corresponding modulation methods with leakage current suppression for this converter are also proposed. Additionally, the derivation of the hybrid converter is summarized and one of its family topologies is presented as an example. Simulations are performed on a 3-kW hybrid converter system. The results have validated the performance of the proposed converter in terms of strong leakage current suppression, high power quality and also flexible reactive power injection.
Original languageEnglish
Title of host publicationProceedings of 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages6
PublisherIEEE Press
Publication dateSep 2019
Pages6680-6685
Article number8912748
ISBN (Electronic)978-1-7281-0395-2
DOIs
Publication statusPublished - Sep 2019
Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
Duration: 29 Sep 20193 Oct 2019

Conference

Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
CountryUnited States
CityBaltimore
Period29/09/201903/10/2019
SponsorIEEE Industry Application Society (IAS), IEEE Power Electronics Society (PELS)
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

Keywords

  • Hybrid converter
  • Leakage current
  • Multiple outputs
  • PV system
  • Transformerless

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