AC generator - speed up

Discussion in 'The Projects Forum' started by engineer20033, Apr 9, 2015.

  1. engineer20033

    Thread Starter New Member

    Apr 9, 2015
    Dear Experts,

    We are building a wind turbine system and we are trying to control the generator speed in order to gain maximum power as possible...
    So is there a way to speed up the generator in case the wind is slow? can we increase the generated frequency of the AC generator?

    Best Regards,
  2. wayneh


    Sep 9, 2010
    You can gear it up but that won't get you more power. Matching the load to the source is an ongoing problem for variable sources like wind and solar.
  3. Papabravo


    Feb 24, 2006
    Use motor plugged into the power grid. No that wouldn't be very efficient, and would probably be dirty pool.
    How about a transmission with a gearbox? Problem is making one that would do what you want by going from low speed to high speed.
    How about a derailleur with a chain drive? Now could you automate it?

    Well that was three ideas. Maybe I'll have some more tomorrow.
  4. tcmtech

    Well-Known Member

    Nov 4, 2013
    The maximum power you will get is determined by your blades swept area and the wind speed.

    If the wind speed is low all the fancy gearing in the world won't gain you any more power than what your blades can grab.
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    Increasing the generator frequency won't increase the power available, which is limited by the wind energy. Use an inverter to increase the rectified generator output voltage to a usable value if need be.
  6. alfacliff

    Well-Known Member

    Dec 13, 2013
    match the blade design to the "generator" and get it all to the right height, higher is better, the air flow is cleaner up above trees, houses and such. matching the blades to the generator will help to prevent overspeed is the blades will not put out as much as the generator can use.
  7. AnalogKid

    Distinguished Member

    Aug 1, 2013
    The original question isn't very clear, as indicated by the wide range of responses. If the goal is to maintain a relatively constant generator frequency as wind speed varies, this usually is done by varying the pitch of the blades.

    shortbus likes this.
  8. Papabravo


    Feb 24, 2006
    OK sure. In an airplane with a variable pitch propeller you can adjust the pitch for constant engine speed at your cruising altitude, since the propeller and the drive shaft are directly coupled.
  9. shortbus

    AAC Fanatic!

    Sep 30, 2009
    Also done in commercially built wind mills, or at least ones built by Siemens.