Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2016

View graph of relations

A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter, in order to achieve high efficiency when PV output voltage varies in a wide range. Moreover, a maximum power point tracking (MPPT) method based on power perturbation is implemented in the dc-ac inverter. Therefore, the complexity of regulating LLC converter can be reduced effectively, and efficiency optimal design can be carried out through the proposed designing procedure for the resonant tank of LLC converter. Finally, a prototype of the proposed PV micro-inverter (PVMI) is developed with rated power of 250W and output voltage of 220VAC/50Hz. The experiment shows that the peak efficiency of the PVMI is 95.5%, where efficiency of LLC converter is up to 97.7%, and the MPPT accuracy is more than 99%. Thus the validity of the proposed system structure, design and control method is verified.
Original languageEnglish
Title of host publicationProceedings of 42nd Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE
Publication date2016
Pages2319-2324
ISBN (print)9781509034741
DOIs
StatePublished - 2016
Event42nd Annual Conference of the IEEE Industrial Electronics Society - Florence, Italy

Conference

Conference42nd Annual Conference of the IEEE Industrial Electronics Society
LocationPalazzo dei Congressi Piazza Adua
CountryItaly
CityFlorence
Period23/10/201626/10/2016
CitationsWeb of Science® Times Cited: No match on DOI

    Keywords

  • Photovoltaic micro-inverter, LLC resonant converter, PFM, Phase-shift PWM, MPPT
Download as:
Download as PDF
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBE/CSEHarvardMLAStandardVancouverShortLong
Word

ID: 126986898