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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Renewable Energy 101

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