Changes

Major players in the Wind Energy sector include: General Electric, Vestas Wind Systems, Siemens AG, Mitsubishi Ltd, REPower Systems AG, Gamesa Innovation & Technology, Enercon, Nordex, Suzlon and Sinovel Wind Group Co. Ltd.

The present study on the IP activity in the area of horizontal axis wind turbines with focus on '''''Doubly-fed Induction Generator (DFIG)''''' is based on a search conducted on Thomson Innovation.

A search is carried out using a combination of keywords and classifications in Thomson Innovation.

The Classifications identified relevant to the scope of the search are:

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<mm>[[mmap825(1.1)_1.mm|Interactive Mindmap|center|title Doubly-fed Induction Generator]]</mm>

A sample of 139 patents from the search are analysed based on the taxonomy.

Provided a link below for sample spread sheet analysis for doubly-fed induction generators.<br>

* [[Media:Doublyfed_induction_generators1.xls| Sample analysis on Doubly-Fed Induction Generator-Non Patent Literature]]

Patenting activity has seen high growth rate in the last two years.

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