Changes
'''Insights'''
* USA, China, Germany, Spain and India share major part of wind energy generationin the year 2010.* Vestas Wind Energy Systems and General Electric are the major players in this wind energy generation technology.* Patenting activity has seen high growth rate in the last two years2009 and 2010.* Research activity mainly going on rating and controlling of the Doubly-fed induction generation systems. Out of 140 139 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>
