Cascaded H-bridge multilevel converter for large-scale PV grid-integration with isolated DC-DC stage

Wei Zhao, Hyuntae Choi, Georgios Konstantinou, Mihai Ciobotaru, Vassilios G. Agelidis

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

70 Citations (Scopus)

Abstract

The integration of large-scale PV systems to the grid is a growing trend in modern power systems. The cascaded H-bridge (CHB) converter is a suitable candidate for the grid interconnection due to its modular characteristics, high-quality output waveforms and capability of connecting to mediumvoltage grids. However, the CHB converter requires isolated DC sources. In order to avoid the leakage currents caused by the high potential differences across the parasitic capacitance of the PV panels to ground, an isolated DC-DC conversion stage is required when the CHB topology is used. The objective of this paper is to compare two PV system configurations based on the CHB multilevel converter using two isolated DC-DC converter topologies, namely the boost-half-bridge (BHB) and the flyback, for their performance on providing isolation and achieving individual MPPT at the DC-DC power conversion stage of large-scale PV power systems. Simulation results from a 263 kW PV system based on a seven-level CHB converter with the two aforementioned isolated DC-DC converters are provided for comparison and evaluation with different input PV voltages.
Original languageEnglish
Title of host publicationProceedings - 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems
Subtitle of host publicationPEDG 2012
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages849-856
Number of pages8
ISBN (Electronic)9781467320238
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012 - Aalborg, Denmark
Duration: 25 Jun 201228 Jun 2012

Other

Other2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012
CountryDenmark
CityAalborg
Period25/06/1228/06/12

Keywords

  • Boost-half-bridge
  • Cascaded H-bridge
  • DC-DC isolated converter
  • large-scale PV

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