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Pat. 9998030 United States, Int. Cl.22 H02M 7/537, G05F 1/67, H02M 1/32, H02P 9/00, G01B 3/52. Converter lifetime improvement method for doubly fed induction generator : Appl. N 14/285497 : Filed 22.05.2014 : Pub. 12.06.2018 : / Lixiang Wei, Russel J. Kerkman, Richard A. Lukaszewski, Haihui Lu, Zhenhuan Yuan ; Assignee Rockwell Automation Technologies Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9998030/en?oq=US9998030.html (дата обращения: ДД.ММ.ГГГГ).