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Pat. 11355925 United States, Int. Cl.22 H02H 9/04, H02J 3/00, H02J 3/36, H02M 5/458. System design solution for DC grid cost reduction and risk minimization : Appl. N 16/966376 : Filed 01.06.2018 : Pub. 07.06.2022 : / Ying-Jiang Hafner ; Assignee Hitachi Energy Switzerland Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11355925/en?oq=US11355925.html (дата обращения: ДД.ММ.ГГГГ).