Cascaded H-bridge multilevel converter topology and three-phase balance control for large scale photovoltaic systems

Sebastian Rivera, Bin Wu, Samir Kouro, Hong Wang, Donglai Zhang

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

72 Scopus citations

Abstract

The increase in the power levels of photovoltaic (PV) energy conversion systems has resulted in new large-scale grid connected configurations that have reached the megawatt level. This substantial increment in the power levels imposes new challenges to the grid interfacing converter, and therefore results in new opportunities to be explored. This work introduces a new medium voltage multilevel scheme based on a three-phase cascaded H-bridge (CHB) converter and multiple PV strings. The proposed configuration enables a large increase of the total power capacity of the PV system, while the introduction of a multilevel converter helps to improve both power quality and efficiency and medium voltage operation at the grid side. The main challenge of the proposed configuration is to handle the inherent power imbalances that occur not only between the different cells of one phase of the converter but also between the three phases. Simulation results of a 7-level CHB PV system are presented to validate the proposed topology and control method.

Original languageEnglish
Title of host publicationProceedings - 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012
Pages690-697
Number of pages8
DOIs
StatePublished - 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

Publication series

NameProceedings - 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012

Conference

Conference2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012
Country/TerritoryDenmark
CityAalborg
Period25/06/1228/06/12

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