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Pat. 10224830 United States, Int. Cl.22 H02M 5/458, H02M 1/14, H02M 7/487. System and method for controlling a back-to-back three-level converter with voltage ripple compensation : Appl. N 15/958381 : Filed 20.04.2018 : Pub. 05.03.2019 : / Duro Basic, Kai Alexander Rothenhagen, Niels Weitendorf ; Assignee Ge Energy Power Conversion Technology Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10224830/en?oq=US10224830.html (дата обращения: ДД.ММ.ГГГГ).