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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 products' 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.
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=Introduction=
Source:[http://www.gwec.net/index.php?id=167 GWEC's Global Wind Report 2009]
'''Insights'''
* USA, China, Germany, Spain and India share major part of wind energy generation in the year 2010.
* Vestas Wind Energy Systems and General Electric are the major players in wind energy generation technology.
* Patenting activity has seen high growth rate in the years 2009 and 2010.
* Research activity mainly going on rating and controlling of the Doubly-fed induction generation systems. Out of 139 patents 120 patents are discussing about controlling the DFIG.
* Continuous Operation of the DFIG system during weak and storm winds, grid voltage sags, and grid faults are major issues in current scenario. Among 28 patents covering DFIG operation, 24 patents are focusing on grid connected mode of operation.
* [http://www.woodward.com/ Woodward GMBH] is a new and fast developing player in the field of DFIG technology,and filed 10 patent applications in the field in year 2010, while it has no prior IP activity.<br><br><br>
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<p align="center"> '''This is only a sample report with brief analysis''' <br>
