Enhanced control and operation of DFIG-based wind farms during network unbalance

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

This paper investigates the control and operation of doubly fed induction generator (DFIG)-based wind generation systems under unbalanced voltage conditions. DFIG system behaviors under unbalanced voltage are analyzed and different control targets are discussed. A new rotor current control strategy containing a main controller and an auxiliary controller is proposed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition, whereas the auxiliary controller is implemented in the negative (dq)- frame with negative sequence current extracted. The impact of providing unbalanced control on converter voltage rating is investigated. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system to validate the proposed control scheme and to demonstrate the enhanced system operation during ldquosmallrdquo steady state and ldquolargerdquo transient unbalances.
Original languageEnglish
Pages (from-to)1073-1081
Number of pages8
JournalIEEE Transactions on Energy Conversion
Volume23
Issue number4
DOIs
Publication statusPublished - Dec 2008

Keywords

  • control design
  • converter
  • doubly fed induction generator (DFIG)
  • modeling
  • unbalance
  • wind turbine

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