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Pat. 10910824 United States, Int. Cl.22 H02H 7/20, H02H 1/00, H02M 3/33, H02M 3/335. Active control-based protection system and method for flexible direct current system of photovoltaic plant : Appl. N 16/936074 : Filed 22.07.2020 : Pub. 02.02.2021 : / Ke Jia, Tianshu Bi, Rui Zhu ; Assignee North China Electric Power University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10910824/en?oq=US10910824.html (дата обращения: ДД.ММ.ГГГГ).