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Pat. 10148091 United States, Int. Cl.22 H02J 3/36, H02M 1/08, H02M 1/088, H02M 7/19, H02M 7/757, H02M 5/14. High voltage direct current power transmission series valve group control device : Appl. N 15/541807 : Filed 21.01.2016 : Pub. 04.12.2018 : / Dongbin Lu, Yongping Wang, Zhenxi Wang, Qiang Zou ; Assignee Nr Electric Co Ltd, Nr Engineering Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10148091/en?oq=US10148091.html (дата обращения: ДД.ММ.ГГГГ).