Print Email Facebook Twitter Operation of grid-connected DFIG under unbalanced grid voltage condition Title Operation of grid-connected DFIG under unbalanced grid voltage condition Author Zhou, Y. Bauer, P. Ferreira, J.A. Pierik, J. Faculty Electrical Engineering, Mathematics and Computer Science Department Electrical Sustainable Energy Date 2009-02-18 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. Subject controldoubly fed induction generator (DFIG)operationunbalanced To reference this document use: http://resolver.tudelft.nl/uuid:edfaf4ed-63ce-442e-b2ff-5b738a13fa1b DOI https://doi.org/10.1109/TEC.2008.2011833 Publisher IEEE ISSN 0885-8969 Source IEEE Transactions on Energy Conversion, 24 (1), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 The Author(s); IEEE Files PDF zhou2009.pdf 369.61 KB Close viewer /islandora/object/uuid:edfaf4ed-63ce-442e-b2ff-5b738a13fa1b/datastream/OBJ/view