By Petersson Andreas
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Additional resources for Analysis, modeling and control of doubly-fed induction generators for wind turbines
6. Γ representation of the IG in stator coordinates. Superscript “s” indicates that the space vectors are referred to the reference frame of the stator of the DFIG. 37) where superscript s indicates stator coordinates. 39) vs stator voltage; Ψs stator flux; ΨR rotor flux; vR rotor voltage; stator current; Rs stator resistance; is RR rotor resistance; iR rotor current; ω1 synchronous frequency; ω2 slip frequency. 42) where LM is the magnetizing inductance, Lσ is the leakage inductance, and np is the number of pole pairs.
In  it was found that the DFIG system produced 60% more energy compared to a fixed-speed system. However, in this study the produced energy of the systems was found to be similar. The difference between the result here and in  is due to the different base assumptions used. Further, it was found in this investigation that there is a possibility to gain a few percentage units (approximately 2%) in energy using the DFIG system compared to the full variable-speed system. This can be compared to a gain of 20% for the DFIG system compared to the variable-speed system reported in .
In the first method, a set of variables is estimated or measured in one reference frame and then the variables are used in another reference frame to estimate the slip angle θ2 . Estimating the rotor currents from the flux and the stator currents can do this. In  the estimation of the rotor currents has been carried out in stator coordinates, while in [46, 68] it has been done in synchronous coordinates. The method will here be described in synchronous coordinates. 104) ˆM L where the stator current has been measured and transformed with the transformation angle θ1 ; see previous section for determination of this angle.