Fault ride through capability
Fault ride through capability
(OP)
Hi all,
I am wondering for a generator of fixed rating, does an induction generator or synchronous generator have better fault ride through capability.
I imagine it would rely quite heavily on the inertia of the rotor. So which topology has a the highest inertia rotor. Also a synch genny will rotate slightly slower.
I guess this leads onto another question, for equal rating will a synch generator or induction generator be heavier/bigger. I would guess a synch generator would be smaller as I imagine the airgap flux density would be larger than that of an induction generator due to excitation rather than induction (all things being equal).
I am wondering for a generator of fixed rating, does an induction generator or synchronous generator have better fault ride through capability.
I imagine it would rely quite heavily on the inertia of the rotor. So which topology has a the highest inertia rotor. Also a synch genny will rotate slightly slower.
I guess this leads onto another question, for equal rating will a synch generator or induction generator be heavier/bigger. I would guess a synch generator would be smaller as I imagine the airgap flux density would be larger than that of an induction generator due to excitation rather than induction (all things being equal).





RE: Fault ride through capability
RE: Fault ride through capability
RE: Fault ride through capability
Refering to the swing equations it seems that rotor inertia is the main factor. Assuming this is true which topology would have a rotor of greater inertia.
What I don't understand and have't been able to find any literature on is fault ride through (or the equivalent of) for an induction generator. I realise there isn't a syncronisation issue but there must be the concern of motoring/reverse power or large current transients or reactive power issues?
RE: Fault ride through capability
For an induction generator, you will generally lose your excitation since the bus voltage will go near zero, so I would not expect them to help you much. If you tried to keep them on line, the speed may go high.
But I'm not burdened by a lot of actual knowledge about induction machines, so it's easy to speculate.