Dynamic modeling and control of DFIG-based wind turbines ynder unbalanced network conditions

L. Xu, Y. Wang

Research output: Contribution to journalArticle

543 Citations (Scopus)

Abstract

This paper presents an analysis and control design of a doubly-fed induction generator (DFIG)-based wind generation system operating under unbalanced network conditions. A DFIG system model in the positive and negative synchronous reference frames is presented. Variations of stator active and reactive powers and generator torque are fully defined in the presence of negative sequence voltage and current. Alternative DFIG control targets during network unbalance, such as reducing stator current unbalance, torque, and power pulsations minimization, are identified. A rotor current control strategy based on positive and negative (dq) reference frames is used to provide precise control of the rotor positive and negative sequence currents. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system. It shows that conventional vector control of DFIG without considering network unbalance results in excessive oscillations on the stator active/reactive power, electromagnetic torque, and stator/rotor currents even with a small stator voltage unbalance. In contrast, with the proposed control strategy, enhanced system control and operation such as minimizing oscillations in either active power, or electromagnetic torque, or stator or rotor currents can be achieved
Original languageEnglish
Pages (from-to)314-323
Number of pages9
JournalIEEE Transactions on Power Systems
Volume22
Issue number1
DOIs
Publication statusPublished - Feb 2007

Keywords

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

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