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  1. acerox

    Stitched vs woven fabric advantages and disadvantages

    Thanks all for the good answers. It does seem to be damage tolerance the main advantage of woven versus UD or stitched fabrics.
  2. acerox

    Stitched vs woven fabric advantages and disadvantages

    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...
  3. acerox

    DFIG Wind Turbines generators Star/Delta connection

    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)...
  4. acerox

    DFIG Wind Turbines generators Star/Delta connection

    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...
  5. acerox

    DFIG Wind Turbines generators Star/Delta connection

    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...
  6. acerox

    DFIG Wind Turbines generators Star/Delta connection

    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.
  7. acerox

    DFIG Wind Turbines generators Star/Delta connection

    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...

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