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Pat. 10498142 United States, Int. Cl.22 H02J 3/36, G01R 21/00, H02M 5/45. Device and method for extinction angle control of HVDC system : Appl. N 16/342511 : Filed 24.11.2016 : Pub. 03.12.2019 : / Seong-Doo Lee, Soon-Ho Choi, Chur-Hee Lee ; Assignee Korea Electric Power Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10498142/en?oq=US10498142.html (дата обращения: ДД.ММ.ГГГГ).