Short circuit infeed from wind generator
Short circuit infeed from wind generator
(OP)
My current work is conceptual design for step-up substation (20/110 kV) for connection of wind generators to the grid. I have to calculate short circuit current on 20 kV switchgear. It is clear about the infeed from 110 kV grid, but I am not sure how to calculate infeed from generators. If they are normal turbogenerators also no problem, but for wind generators according to me the methods should be different. They are not connected directly, and as far as I know there are inverters installed between the generator and step-up transformer (generator voltage)/20 kV in each tower. I suppose there is some current limiting automation in these inverters.
The project is still in conceptual phase, so the manufacturer of generators is not determined. The only available information is that generators will be 3 MVA each.
Would you advice me on this matter ?
The project is still in conceptual phase, so the manufacturer of generators is not determined. The only available information is that generators will be 3 MVA each.
Would you advice me on this matter ?
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It may be like this in theory and practice, but in real life it is completely different.
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RE: Short circuit infeed from wind generator
FWIW, most of the wind generators we see in the US do not have a inverter on the generator output. They are doubly-fed, with an inverter feeding only the rotor circuit.
"An 'expert' is someone who has made every possible mistake in a very narrow field of study." -- Edward Teller
RE: Short circuit infeed from wind generator
RE: Short circuit infeed from wind generator
I think GE holds a US patent on the doubly-fed design, but elsewhere in the world they are supplied by other companies, such as Vestas.
"An 'expert' is someone who has made every possible mistake in a very narrow field of study." -- Edward Teller
RE: Short circuit infeed from wind generator
RE: Short circuit infeed from wind generator
But if the supplier is unknown and the goal is to calculate the maximum available fault current, it might be better to assume there is no inverter on the output.
"An 'expert' is someone who has made every possible mistake in a very narrow field of study." -- Edward Teller
RE: Short circuit infeed from wind generator
If the inverter is on the field, short circuit current will be determined (mostly) by the generator characteristics.
If the inverter is supplying the total output, the short circuit current will be determined (mostly) by the inverter characteristics.
Bill
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"Why not the best?"
Jimmy Carter
RE: Short circuit infeed from wind generator
In terms of protection design and settings wind turbines are not a reliable source of fault current, so the protection schemes for the turbines look pretty much like normal distribution protection schemes would, as if feeding a load rather than a generator.
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Regards
Marmite
RE: Short circuit infeed from wind generator
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
RE: Short circuit infeed from wind generator
RE: Short circuit infeed from wind generator
The positive point is that the grid is quite strong at that area, and guys from respective department of system operator have very good model and are very competent, so at least from their side I don't expect problems.
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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant