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Pat. 10305370 United States, Int. Cl.22 H02M 1/32, H02M 1/42, H02M 7/515, H02M 7/519, H02M 7/521, H02M 7/525, H02M 7/757, H02M 7/48. Elimination of commutation failure by hybrid HVDC system : Appl. N 15/571715 : Filed 11.04.2016 : Pub. 28.05.2019 : / Xiao-Ping Zhang, Ying Xue ; Assignee University of Birmingham ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10305370/en?oq=US10305370.html (дата обращения: ДД.ММ.ГГГГ).