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Pat. 11476658 United States, Int. Cl.22 H02J 3/36, G01R 31/52, H02H 7/125, H02H 9/02, H02M 1/32, H02M 7/483. Communication less control technique for hybrid HVDC : Appl. N 16/956031 : Filed 21.12.2017 : Pub. 18.10.2022 : / Saurav Roy-Choudhury, Ying Jiang-Hafner, Gaurav-Kumar Kasal, Morteza Mohammadi, Mats Andersson ; Assignee Hitachi Energy Switzerland Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11476658/en?oq=US11476658.html (дата обращения: ДД.ММ.ГГГГ).