A common-ground single-phase five-level transformerless boost inverter for photovoltaic applications

Ben Shaffer, Hassan A. Hassan, Mark J. Scott, Saad Ul Hasan, Graham E. Town, Yam Siwakoti

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

17 Citations (Scopus)

Abstract

This paper presents a transformerless five-level boost inverter with common ground connection for single-phase photovoltaic (PV) systems. It consists of nine switches, two capacitors, and an LC filter at the output. The topology eliminates common mode (CM) leakage current by connecting the negative terminal of the PV directly to the neutral point of the grid, which bypasses the PV array's stray capacitance. As compared to the conventional flying capacitor (FC) multilevel inverter and the cascaded H-bridge (CHB) multilevel inverter, the proposed topology achieves an output voltage that is up to four-times higher given an equivalent dc-link voltage. This reduces the dc-link voltage requirement to one fourth of the values used in conventional multilevel inverters (FC, CHB, NPC, ANPC) and one half of the conventional H-bridge topologies. The following manuscript presents the operation principles and theoretical analysis of the proposed topology, which are supported by simulation and experimental results. A 1 kW prototype was constructed; it achieves 96 % efficiency operating at an output of 240 VAC, 60 Hz, and 973 W.

Original languageEnglish
Title of host publicationThe 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages368-374
Number of pages7
ISBN (Electronic)9781538611807, 9781538611791
ISBN (Print)9781538611814
DOIs
Publication statusPublished - 2018
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
Duration: 4 Mar 20188 Mar 2018

Publication series

Name
ISSN (Electronic)2470-6647

Conference

Conference33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
CountryUnited States
CitySan Antonio
Period4/03/188/03/18

Keywords

  • Common mode (CM) current
  • photovoltaic (PV) system
  • switched capacitor
  • transformerless inverter
  • virtual DC bus

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