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Short circuit calculation with type 4 wind turbines or PV generator

Hello, guys.

I am conducting a short circuit calculation with the existance of type 4 wind turbines. The manufacturer recommended:

The WTG should be modelled as a current source for short circuit studies. The current source should contribute a maximum of 1.2 p.u during the fault. In PSS/E the value of Zsource is obtained from the maximum short circuit current contribution. The recommended values are provided separately.

Anyone here has experienced with short circuit studies of WTG? How did you do it? I have no idea to add a current source to SC study in PSSE. I thought of using Zsource =1/ Isc_max. Is this possible?