Multilevel direct power control - A generalized approach for grid-tied multilevel converter applications

Sebastian Rivera, Samir Kouro, Bin Wu, Salvador Alepuz, Mariusz Malinowski, Patricio Cortés, Jose Rodriguez

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

This paper presents a generalized multilevel direct power control (ML-DPC) scheme for grid-connected multilevel power converters. The proposed method extends the original DPC operating principle by considering only the closest subset of two-level voltage vectors to the present switching state. The implementation of this principle requires the power derivatives for feedback, which can present numerical problems when applied experimentally, mainly due to high measurement noise sensitivity. Therefore, a derivative estimator is proposed based on the converter-grid model in the synchronous reference frame. In addition, a virtual flux observer is developed to achieve synchronization and improve robustness in the presence of grid voltage harmonics. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper, simulations and experimental results are presented for a seven-level cascaded H-bridge converter.

Original languageEnglish
Article number6680748
Pages (from-to)5592-5604
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume29
Issue number10
DOIs
StatePublished - Oct 2014
Externally publishedYes

Keywords

  • Direct power control (DPC)
  • grid connection
  • multilevel converters

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