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DFIG transformer modeling for powerflow and short-circuit

asked Jan 29 '5

anonymous user

Anonymous

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)?

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answered Jan 29 '5

perolofl gravatar image

You can use a 2W-transformer if the 6 kV winding is not used. If so, enter a xx/0.69 kV transformer and use the short circuit impedance between primary and tertiary winding.

If you use a 3W-transformer, enter a dummy bus for the secondary winding and connect the generator to tertiary bus.

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Asked: Jan 29 '5

Seen: 117 times

Last updated: Jan 29