Analysis of dead-time harmonics in single-phase transformerless full-bridge PV inverters

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

24 Citations (Scopus)

Abstract

A short period, called dead time, is usually implemented (e.g., through adding extra hardware in gate drivers or modifying pulse-width modulation schemes) for voltage source inverters to prevent shoot-through incidents. Clearly, larger dead time provides more safety, but may also degrade the injected currents from inverters. It thus requires sophisticated compensation schemes to meet certain stringent standards. For single-phase transformerless full-bridge PV inverters, different modulation schemes can be employed to suppress leakage currents, which in return may affect the distribution of the dead time harmonics. Thus, this drives the analysis of dead time harmonics in single-phase transformerless full-bridge inverters considering two modulation strategies: bipolar and unipolar modulation schemes. Effects of modulation on the dead time harmonics are observed in simulations and experimental tests. Furthermore, a periodic controller is adopted to mitigate the harmonics, which is independent of the modulation schemes.
Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages6
PublisherIEEE Press
Publication dateMar 2018
Pages1310-1315
ISBN (Electronic) 978-1-5386-1180-7
DOIs
Publication statusPublished - Mar 2018
Event2018 IEEE Applied Power Electronics Conference and Exposition (APEC) - San Antonio, United States
Duration: 4 Mar 20188 Mar 2018

Conference

Conference2018 IEEE Applied Power Electronics Conference and Exposition (APEC)
CountryUnited States
CitySan Antonio
Period04/03/201808/03/2018

Keywords

  • Single-phase inverter
  • Dead-time
  • Bipolar modulation
  • Unipolar modulation
  • Harmonics
  • Repetitive controller

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