W dt qr R
sref
qrref
T2 s
Utxm, qr
Fig. 4. Block diagram of real power control system in rotor-side converter
sref
T2 s
Fig. 5. Block diagram of reactive power control loop in rotor-side converter
Similarly, the corresponding stator reactive power control model can be described as dh
So far, based on the stator flux-oriented control strategy, and considering the decoupled control of the real and reactive power outputs of DFIG, the whole reduced practical electromechanical transient DFIG model consists of the following 7th order model
ds X
dt X
dt Tr Xr dddf = KUq^ (A-Tr)I,r + KUqsXrA Udr -+ Q^f) (42)
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