DFIG transformer modeling for powerflow and short-circuit
Hello. I have a DFIG wind turbine connected to network with a three-winding step-up WTG transformer. The secondary rated voltage of the system transformer is 6 kV, the tertiary side 690 V. The switching group of the system transformer is Dyn11yn11. How can I model it in PSS with an equivalent 2 winding transformer and what are the implications for power flow and short-circuit calculations? For example I don't know if for short-circuit the secondary of the equivalent transformer should be 6kV or 690kV. If it is better to model a 3-winding transformer how do I connect it to a single generator (one bus bar)?