Operation of grid-connected DFIG under unbalanced grid voltage condition

Y Zhou, P Bauer, JA Ferreira, J Pierik

    Research output: Contribution to journalArticleScientificpeer-review

    233 Citations (Scopus)

    Abstract

    Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent during grid voltage dip. But under unbalanced grid voltage condition, the severe problems are not the transient overcurrent, but the electric torque pulsation and dc voltage ripple in the back-to-back VSCs. This paper develops dynamic models in MATLAB/Simulink, validates it through experiments, investigates the behavior of DFIG during unbalanced grid voltage condition, and proposes new controllers in separated positive and negative sequence. Methods to separate positive and negative sequence components in real time are also developed, and their responses to unsymmetrical voltage dip are compared. Simulation results prove that the separated positive and negative sequence controllers limit the torque pulsation and dc voltage ripple effectively.
    Original languageUndefined/Unknown
    Pages (from-to)240-246
    Number of pages7
    JournalIEEE Transactions on Energy Conversion
    Volume24
    Issue number1
    DOIs
    Publication statusPublished - 2009

    Keywords

    • academic journal papers
    • CWTS 0.75 <= JFIS < 2.00

    Cite this