Open AccessReactive power capability of a wind turbine with doubly fed induction generator
Author(s) -
Lund Torsten,
Sørensen Poul,
Eek Jarle
Publication year - 2007
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/we.228
Subject(s) - stator , induction generator , turbine , control theory (sociology) , rotor (electric) , ac power , limit (mathematics) , wind power , engineering , generator (circuit theory) , steam turbine , voltage , power (physics) , physics , electrical engineering , computer science , mathematics , mechanical engineering , mathematical analysis , control (management) , quantum mechanics , artificial intelligence
The aim of the work is to derive a steady state PQ‐diagram for a variable speed wind turbine equipped with a Doubly Fed Induction Generator. Firstly, the dependency between optimal rotor speed and wind speed is presented. Secondly, the limitations in reactive power production, caused by the rotor current, the rotor voltage and the stator current are derived. Thirdly, the influence of switching from Δ to Y coupling of the stator is investigated. Finally, a complete PQ diagram for a wind turbine is plotted. It is concluded that the limiting factor regarding reactive power production will typically be the rotor current limit, and that the limit for reactive power absorption will be the stator current limit. Further, it is concluded that the rotor voltage will only have a limiting effect at high positive and negative slips, but near the limitation, the reactive power capability is very sensitive to small changes in the slip. Copyright © 2007 John Wiley & Sons, Ltd.