Abstract
Doubly Fed Induction Generator (DFIG) is one of the most reliable wind generator. Major problem in wind power generation is to generate constant frequency output on variable speed. This paper summarizes & reviews major techniques used in DFIG, and investigate various technologies developed by and solution proposed by different researchers to maintain constant frequency. In addition authors proposed method on these issues is discussed and experimental results are also included. DFIG experiment is demonstrated by driving it with a motor instead of real wind turbine. A variable frequency drive will be used to cause drive motor speed variations. Control circuit is attached with rotor windings, which will try to maintain the rotor excitation constant during speed variations. Proposed DFIG model controls the rotating magnetic field of the rotor in such a way that stator frequency becomes independent of RPM. Experiment is successfully performed on +/- 12 % speed variations.
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