Control and Modeling of Push-Pull Forward Three-Level Converter for Microgrid

Zhilei Yao, Jing Xu, Josep M. Guerrero

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

1 Citation (Scopus)
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Abstract

Renewable energy sources are widely used in microgrid. Output voltage of them is often low and varies widely. Because diodes in three-level legs in traditional three-level (TL) converter are substituted by MOSFETs, the push-pull forward (PPF) TL converter is very suitable for wide and low inputvoltage applications. It can operate at two-level and three-level modes. Modeling of the proposed converter is established. Control of the proposed converter is designed, which contains output voltage loop and current limit loop. In addition, control block diagrams of both modes can be simplified to one control diagram. By adding input voltage feedforward, influences of input voltage on output voltage and inductor current can be eliminated. The divider in the input voltage feedforward is simplified by two piecewise linear functions, which can be easily implemented by operational amplifiers. Therefore, cost can be reduced. Simulation results of a 1-kW PPF TL converter verify the theoretical analysis.
Original languageEnglish
Title of host publicationProceedings of the 2015 Aegean Conference Electrical Machines and Power Electronics ACEMP
EditorsH. Bulent Ertan
Number of pages7
PublisherIEEE Press
Publication dateSep 2015
Pages455 - 461
ISBN (Print)978-1-4763-7239-8
DOIs
Publication statusPublished - Sep 2015
Event Aegean Conference Electrical Machines and Power Electronics - Ankara, Turkey
Duration: 2 Sep 20154 Sep 2015

Conference

Conference Aegean Conference Electrical Machines and Power Electronics
CountryTurkey
CityAnkara
Period02/09/201504/09/2015

Keywords

  • Three-level converter
  • DC-DC converter
  • Three-level mode
  • Two-level mode
  • Input voltage feedforward

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