Sync Equivalent of an Induction machine
Sync Equivalent of an Induction machine
(OP)
Hey
Does anyone know any good references for the method of producing a synchronous equivalent of an induction machine?
Does anyone know any good references for the method of producing a synchronous equivalent of an induction machine?






RE: Sync Equivalent of an Induction machine
Modeling something? If so what type of study?
Looking for a motor for an application? What application?
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RE: Sync Equivalent of an Induction machine
I need this too, I am modelling two induction generators in paralle and I have to calculate their three phase fault current and single phase fault current.
RE: Sync Equivalent of an Induction machine
Usually the induction generator/motor neutral is not connected to ground so it does not contribute to a single phase to ground fault.
RE: Sync Equivalent of an Induction machine
It is for the purposes of modelling and so that the the model won't have to include a model of the Doubly Fed Induction Generator power electronic converter.
Any thoughts?
RE: Sync Equivalent of an Induction machine
One way I think about it is if the generator were feeding fault through a transformer with grounded wye on secondary. The fault tries to bring the faulted phase voltage to neutral/ground. But that would create unbalanced phase voltages and the generator is going to try to feed current to keep the phase voltages balanced.
Also I'm remembering the SLG symmetric components analysis would depend on three sequence networks in series. The Zero sequence network has in parallel all paths to ground. Other loads connected to ground in parallel can cause a non-infinite zero sequenc eimpedance. The ungrounded generator doesn't contribute anything toward decreasing this zero sequence impedance but it does provide the driving voltage source in the positive sequence network (connected in series with the zero sequence network) which drives the fault current.
I'm reaching way back and could be off base but that's how I'm remembering it.
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RE: Sync Equivalent of an Induction machine
Bung
Life is non-linear...
RE: Sync Equivalent of an Induction machine
The DFIG only has power electronics on the Rotor Circuit so it is not totally isolated from the grid. But (and I assume this is why i'm being asked for this) the 'worst case' seems to be to consider a normal induction machine (I know, a very worst case indeed). So, if we ignore the fact its a DFIG how would you produce an equivalent synchrnous machine to a normal induction machine?
RE: Sync Equivalent of an Induction machine
Perhaps something like IEC 909 or similar standards on fault level calcs could give some guidance?
Bung
Life is non-linear...
RE: Sync Equivalent of an Induction machine