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Note, that from a dynamic point of view, the rotor and the stator leakage inductance have the same effect. Therefore, it is possible to use a different representation of the Park model in which the leakage inductance is placed in the rotor circuit, the so-called Γ representation of the induction machine [94]. The name is due to the formation of a “Γ” of the inductances; see Fig. 6. This model is described by the following space-vector 41 DFIG isg iss + + Esg vss − − isf Lσ Rs RR jωr ΨsR isR MSC + ≈ s vR LM = − Rf Lf + + ≈ vfs − Grid filter vdc Cdc = − GSC dc-link Fig.

Smaller converter implies a smaller variable-speed range for the DFIG system) and finally 3) comparison of the DFIG system to other electrical systems. In order to make the comparison as fair as possible the base assumption used in this work is that the maximum (average) shaft torque of the wind turbine systems used should be the same. Moreover, the rated WT power used in this chapter is 2 MW. 1 Determination of Power Losses Steady-state calculations are carried out in this section in order to determine the power losses of the DFIG system.

According to [17], pure stator-voltage orientation can be done without any significant error. , the machine is aligned with a virtual grid flux. 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.

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