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Pat. 10700525 United States, Int. Cl.22 H02J 3/00, H02J 3/36, H02M 1/32, H02M 5/458, H02M 7/483, H02M 7/757. Method and apparatus for controlling hybrid direct-current transmission system : Appl. N 16/079967 : Filed 19.01.2017 : Pub. 30.06.2020 : / Wenqiang Zhao, Nannan Wang, Yongping Wang, Jiang Lu, Chuanjun Bai, Yu Lu ; Assignee Nr Electric Co Ltd, Nr Engineering Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10700525/en?oq=US10700525.html (дата обращения: ДД.ММ.ГГГГ).