Changes
* Patenting activity has seen high growth rate in the last two years.
* Research activity mainly going on rating and controlling of the Doubly-fed induction generation systems. Out of 140 patents 120 patents are discussing about controlling the DFIG
* Continuous Operation of the DFIG system during weak and storm winds, during grid voltage sags and grid faults is one of the main concerns to the companies. Among 28 operation patents are , 24 patents are talking about grid connected mode of operation
* [http://www.woodward.com/ Woodward GMBH] is a new and fast developing player in this technology having 10 patents on Operation, Regulation, Control and Protection of DFIG in the Year 2010
* Brush-less operation technology reduces the wear and tear and increases the efficiency and life of the system. This technology is protected by small players, in which Dual Stator Technology Corp plays major role.<br><br><br>
