Coordinated control of DFIG and FSIG-based wind farms under unbalanced grid conditions

Yi Wang, Lie Xu

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)


This paper investigates the control and operation of doubly-fed induction generator (DFIG) and fixed-speed induction generator (FSIG) based wind farms under unbalanced grid conditions. A DFIG system model suitable for analyzing unbalanced operation is developed, and used to assess the impact of an unbalanced supply on DFIG and FSIG operation. Unbalanced voltage at DFIG and FSIG terminals can cause unequal heating on the stator windings, extra mechanical stresses and output power fluctuations. These problems are particularly serious for the FSIG-based wind farm without a power electronic interface to the grid. To improve the stability of a wind energy system containing both DFIG and FSIG based wind farms during network unbalance, a control strategy of unbalanced voltage compensation by the DFIG systems is proposed. The DFIG system compensation ability and the impact of transmission network impedance are illustrated. The simulation results implemented in Matlab/Simulink show that the proposed DFIG control system improves not only its own performance, but also the stability of the FSIG system with the same grid
connection point during network unbalance.
Original languageEnglish
Pages (from-to)367-377
Number of pages11
JournalIEEE Transactions on Power Delivery
Issue number1
Publication statusPublished - Jan 2010


  • coordinated control
  • DFIG
  • FSIG-based wind farms
  • unbalanced grid conditions


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