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One approach to allowing wind turbine speed to vary is to accept whatever frequency the generator produces, convert it to DC, and then convert it to AC at the desired output frequency using an inverter. This is common for small house and farm wind turbines. But the inverters required for megawatt-scale wind turbines are large and expensive.
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.
English: Doubly fed induction generator (DFIG) connected to a wind turbine. Deutsch: Doppelt gespeiste Asynchronmaschine als Generator in einer Windturbine. Date:
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
It also says it can deliver a 10% to 25% boost in capacity factor, which is a wind farm measure stating a system's average output divided by its total capacity for generation.
The generator, which is approximately 34% of the wind turbine cost, includes the electrical generator, [64] [65] the control electronics, and most likely a gearbox (e.g., planetary gear box), [66] adjustable-speed drive, or continuously variable transmission [67] component for converting the low-speed incoming rotation to high-speed rotation ...
This for example can happen when wind generators don't spin due to a sudden lack of wind. This load perturbation can cause a load-frequency control problem. This problem can be amplified in DFIG-based wind power generators. [14]
All the articles under D.F.I.G are describing the derivation to convert 3 axis into d q transformation ( 2 axis) only. How to modify the existing asynchronous induction motor in a Wind Electric Generator to a Doubly Fed Induction Generator for Reactive control or improve the Reactive Power?117.193.134.154 16:18, 26 December 2010 (UTC)
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