Changes

This report presents a brief summary about wind energy and present day technologies available for horizontal wind turbines. A detailed taxonomy for horizontal axis wind turbines is presented covering parts of the turbine, control systems, applications among others. A detailed landscape analysis of patent and non-patent literature is done with focus on '''Doubly-fed Induction Generator (DFIG)''' used in the horizontal axis wind turbines for efficient power generation. Existing product's information of major players in the market is also compiled for doubly-fed induction generators. Existing market and future market prediction for wind energy based power generation is presented.

=Introduction=