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  2. Doubly fed electric machine - Wikipedia

    en.wikipedia.org/wiki/Doubly_fed_electric_machine

    This is useful for large variable speed wind turbines, because wind speed can change suddenly. When a gust of wind hits a wind turbine, the blades try to speed up, but a synchronous generator is locked to the speed of the power grid and cannot speed up. So large forces are developed in the hub, gearbox, and generator as the power grid pushes back.

  3. Variable speed wind turbine - Wikipedia

    en.wikipedia.org/wiki/Variable_speed_wind_turbine

    For variable speed wind turbines, one of two types of generators can be used: a DFIG (doubly fed induction generator) or an FRC (fully rated converter). A DFIG generator draws reactive power from the transmission system; this can increase the vulnerability of a transmission system in the event of a failure.

  4. Low voltage ride through - Wikipedia

    en.wikipedia.org/wiki/Low_voltage_ride_through

    For wind turbines, the FRT testing is described in the standard IEC 61400-21 (2nd edition August 2008). More detailed testing procedures are stated in the German guideline FGW TR3 (Rev. 22). Testing of devices with less than 16 Amp rated current is described in the EMC standard IEC 61000-4-11 [13] and for higher current devices in IEC 61000-4 ...

  5. Wind turbine design - Wikipedia

    en.wikipedia.org/wiki/Wind_turbine_design

    An example of a wind turbine, this 3 bladed turbine is the classic design of modern wind turbines Wind turbine components : 1-Foundation, 2-Connection to the electric grid, 3-Tower, 4-Access ladder, 5-Wind orientation control (Yaw control), 6-Nacelle, 7-Generator, 8-Anemometer, 9-Electric or Mechanical Brake, 10-Gearbox, 11-Rotor blade, 12-Blade pitch control, 13-Rotor hub

  6. NBA rewind: Cavaliers are soaring; here's how they could be ...

    www.aol.com/nba-rewind-cavaliers-soaring-heres...

    The Cavaliers have staying power; here's how they can get even better Cleveland (26-4) has proved it is not a fluke and that coach Kenny Atkinson’s plan to space the floor has paid off in an ...

  7. Permanent magnet synchronous generator - Wikipedia

    en.wikipedia.org/wiki/Permanent_magnet...

    A permanent magnet synchronous generator is a generator where the excitation field is provided by a permanent magnet instead of a coil. The term synchronous refers here to the fact that the rotor and magnetic field rotate with the same speed, because the magnetic field is generated through a shaft-mounted permanent magnet mechanism, and current is induced into the stationary armature.

  8. “General Hospital”'s Chad Duell Leaves Series with ... - AOL

    www.aol.com/lifestyle/general-hospital-chad...

    Chad Duell is leaving General Hospital with a bang.. The Jan. 6 episode of the long-running soap opera marked the beginning of the 37-year-old actor's exit storyline when his character Michael ...

  9. How the Fed and Trump could collide in 2025 [Video]

    www.aol.com/finance/fed-trump-could-collide-2025...

    President-elect Donald Trump and Federal Reserve Chair Jay Powell have clashed before, and there is a chance they could do so again in 2025.

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