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Pat. 10861657 United States, Int. Cl.22 H01H 9/54, G05F 1/00, H01H 33/59, H02J 3/36, H02M 7/757. Bidirectional power valve and control method therefor and hybrid multi-terminal HVDC system using the same : Appl. N 15/796838 : Filed 29.10.2017 : Pub. 08.12.2020 : / Xiaobo Yang, Bernt Bergdahl, Chunming Yuan, Dawei Yao, Chao Yang ; Assignee Abb Power Grids Switzerland Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10861657/en?oq=US10861657.html (дата обращения: ДД.ММ.ГГГГ).