Hello Everybody,
I have been coming around this question for a while. I have found a thread about it but I was hoping to get some more ideas.
Why would you use woven fabric instead of UD, for example a layer of woven vs biax (two UD stitched together)? I fail to the see the advantage of woven...
Thanks lot Matthew, great explanation. Let me put some numbers from my case to see if understood it.
2MW turbine
4 Poles generator in a 50Hz grid.
Stator Voltage 690V
Converter Voltage 480V
Rated gen rpm=1680rpm
Syncr speed =1500 rpm
So power through the converter is 1680/1500=10.71% (214kW)...
So, what you are saying is that in star connection the voltage is lower (57%) and so the magnetization losses?
In some turbines the switching star/delta is not active, so they connect directly in delta, so I guess the inverter can handle that voltage.
Well then, what´s all about the...
Yes, but you cannot change the slip so much, so for a traditional squirrel cage generator (with no converter) the slip is typically 1-2%, If you add a converter in the rotor side (and a DFIG), that slip is increase at around 30%, and if you have a full converter, as you said, then you can match...
Can you be more specific? If it is a 3 phases, 6 poles generator in a 60Hz network, the synchronous speed should is 60*60/3=1200 rpm. The generator will produce power at 1200-1220rpm (1-2% of slip). if the RPM are let´s say 200rpm the generator will not generate any power.
Hi,
I have a question in regards DFIG (Double Fed Induction Generators) used in big wind turbines (2MW for example).
http://www.eng-tips.com/postedit.cfm?id=8035900&action=edit
Generally speaking those generators work slightly above the synchronous speed, then the converter allows a higher...
