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Doubly fed induction generator (DFIG), a generating principle widely used in wind turbines. It is based on an induction generator with a multiphase wound rotor and a multiphase slip ring assembly with brushes for access to the rotor windings. It is possible to avoid the multiphase slip ring assembly, but there are problems with efficiency, cost ...
Unlike the DFIG, the FRC can employ a squirrel cage rotor in the generator; an example of this is the Siemens SWT 3.6-107, which is termed the industry workhorse. [7] An example of a permanent magnet generator is the Siemens SWT-2.3-113. [8] A disadvantage of a permanent magnet generator is the cost of materials that need to be included. [9]
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.
The effect is more pronounced in doubly-fed induction generators (DFIG), [3] which have two sets of powered magnetic windings, than in squirrel-cage induction generators which have only one. Synchronous generators may slip and become unstable, if the voltage of the stator winding goes below a certain threshold.
English: Doubly fed induction generator (DFIG) connected to a wind turbine. Deutsch: Doppelt gespeiste Asynchronmaschine als Generator in einer Windturbine. Date:
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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Schematic symbol of a slip ring motor. A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance.
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