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Pat. 10164428 United States, Int. Cl.22 H02J 1/00, H02J 3/36, H02M 1/32, H02M 7/483. Voltage-source multi-level converter, DC power transmission system, and fault processing method and device : Appl. N 15/308842 : Filed 05.02.2015 : Pub. 25.12.2018 : / Guorong Shen, Jie Tian, Dongming Cao, Haiying Li, Yunlong Dong, Nannan Wang, Haibin Liu, Yu Lu ; Assignee Nr Electric Co Ltd, Nr Engineering Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10164428/en?oq=US10164428.html (дата обращения: ДД.ММ.ГГГГ).