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Variable speed cascaded doubly fed induction generators (CDFIG) have been recently proposed to apply in renewable energy generation systems i.e. small hydropower plants, windmills, shaft generators of vessels and embedded applications. CDFIG requires lower maintenance than DFIG due the absence of slip rings and brushes. It can operate with secondary side converter with fractional ratings of the total...
In the near future brushless induction machines could become the real alternative for the brush-geared doubly fed induction generators in windmills applications. Cascaded doubly fed induction generator (CDFIG) examined in the paper consists of two identical wound rotor induction machines having their rotors mechanically and electrically coupled. In CDFIG both stators of connected machines are accessible...
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