Flexible Control of Photovoltaic Grid-Connected Cascaded H-Bridge Converters during Unbalanced Voltage Sags

Hossein Dehghani Tafti, Ali Iftekhar Maswood, Georgios Konstantinou, Christopher David Townsend, Pablo Acuna, Josep Pou

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Multilevel cascade H-bridge (CHB) converters are one of the promising solutions for medium- and large-scale grid-connected photovoltaic power plants. However, there is a lack of a complete study about their operation during voltage sags. This paper proposes a flexible control strategy for the operation of photovoltaic grid-connected CHB inverters during unbalanced voltage sags. The key novelty is that the proposed strategy is able to inject both active and reactive powers to the grid with either balanced or unbalanced currents, while ensuring that all dc-link capacitor voltages remain balanced. The simulation and experimental evaluations of a 9-kVA grid-connected seven-level CHB illustrate and validate the performance of the proposed strategy for the operation of the grid-connected CHB converter during different unbalanced voltage sags.

Original languageEnglish
Pages (from-to)6229-6238
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume65
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018

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