Coordinated control of DFIG's rotor and grid side converters during network unbalance

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280 Citations (Scopus)

Abstract

This paper proposes a coordinated control of the rotor side converters (RSCs) and grid side converters (GSCs) of doubly-fed induction generator (DFIG) based wind generation systems under unbalanced voltage conditions. System behaviors and operations of the RSC and GSC under unbalanced voltage are illustrated. To provide enhanced operation, the RSC is controlled to eliminate the torque oscillations at double supply frequency under unbalanced stator supply. The oscillation of the stator output active power is then cancelled by the active power output from the GSC, to ensure constant active power output from the overall DFIG generation system. To provide the required positive and negative sequence currents control for the RSC and GSC, a current control strategy containing a main controller and an auxiliary controller is analyzed. 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 sequence (dq)- frame with negative sequence current extracted. Simulation results using EMTDC/PSCAD are presented for a 2 MW DFIG wind generation system to validate the proposed control scheme and to show the enhanced system operation during unbalanced voltage supply. (Abstract from: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4494794&tag=1)
Original languageEnglish
Pages (from-to)1041-1049
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume23
Issue number3
DOIs
Publication statusPublished - 2 May 2008

Keywords

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

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