Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

S. Rivera, S. Kouro, B. Wu, Jose I. Leon, Jose Rodriguez, Leopoldo G. Franquelo

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

183 Scopus citations

Abstract

Large scale grid connected photovoltaic (PV) energy conversion systems have reached the megawatt level. This imposes new challenges on existing grid interface converter topologies and opens new opportunities to be explored. In this paper a new medium voltage multilevel-multistring configuration is introduced based on a three-phase cascaded H-bridge (CHB) converter and multiple string dc-dc converters. The proposed configuration enables a large increase of the total capacity of the PV system, while improving power quality and efficiency. The converter structure is very flexible and modular since it decouples the grid converter from the PV string converter, which allows to accomplish independent control goals. 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. The control strategy to deal with these imbalances is also introduced in this paper. Simulation results of a 7-level CHB for a multistring PV system are presented to validate the proposed topology and control method.

Original languageEnglish
Title of host publicationProceedings - ISIE 2011
Subtitle of host publication2011 IEEE International Symposium on Industrial Electronics
Pages1837-1844
Number of pages8
DOIs
StatePublished - 2011
Externally publishedYes
Event2011 IEEE International Symposium on Industrial Electronics, ISIE 2011 - Gdansk, Poland
Duration: 27 Jun 201130 Jun 2011

Publication series

NameProceedings - ISIE 2011: 2011 IEEE International Symposium on Industrial Electronics

Conference

Conference2011 IEEE International Symposium on Industrial Electronics, ISIE 2011
Country/TerritoryPoland
CityGdansk
Period27/06/1130/06/11

Fingerprint

Dive into the research topics of 'Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems'. Together they form a unique fingerprint.

Cite this