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Pat. 10181799 United States, Int. Cl.22 H02M 5/45, H02H 7/26, H02J 3/06, H02J 3/36, H02M 5/458. Hybrid back-to-back direct current transmission system and power flow reversal control method : Appl. N 15/735204 : Filed 19.01.2017 : Pub. 15.01.2019 : / Nannan Wang, Wenqiang Zhao, Yongping Wang ; Assignee Nr Electric Co Ltd, Nr Engineering Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10181799/en?oq=US10181799.html (дата обращения: ДД.ММ.ГГГГ).