By Petersson Andreas
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Extra resources for Analysis, modeling and control of doubly-fed induction generators for wind turbines
The number of poles in the rotor must equal the sum of the number of poles in the two stator windings . For further information and more details, see [106, 108, 111]. Doubly-Fed Reluctance Machine The stator of the doubly-fed reluctance machine is identical to the brushless doubly-fed induction machine, while the rotor is based on the principle of reluctance. An equivalent circuit with constant parameters can be obtained for the doubly-fed reluctance machine, in spite the 20 Converter Fig.
Fig. 9 shows an example of the space vectors of the grid voltage and the stator flux. As illustrated by the figure there is only a small angular difference between the grid-voltage and stator-flux space vectors in the stator-flux reference frame compared to the grid-flux reference frame. 60) q q Eg Eg Ψs Ψs d b) a) Ψg d Fig. 9. Space-vector diagram of grid voltage and stator flux. a) Stator-flux orientation. b) Grid-flux orientation. where Ψss is the stator flux in stator coordinates. 61) where θˆ1 is the estimate of θ1 , ψs is the stator flux magnitude, and θ˜1 = θ1 − θˆ1 is the error between the synchronous angle and its estimate.
54 Estimation of Slip-Frequency Angle In the literature there are at least two methods to perform sensorless operation. 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.
Analysis, modeling and control of doubly-fed induction generators for wind turbines by Petersson Andreas