公开(公告)号：US20200343717A1

公开(公告)日：2020-10-29

申请号：US16861439

申请日：2020-04-29

Applicant: SIEMENS AKTIENGESELLSCHAFT

Inventor： EPAMEINONDAS KONTOS ,  KILIAN DALLMER-ZERBE ,  DOMINIK ERGIN ,  ILHOM GAFUR ,  SEBASTIAN SEMMLER

IPC: H02H7/125 ,  H02H1/00 ,  H02M7/217

Abstract: A method manages a fault on a DC voltage side of a converter assembly including a modular multistage converter with switching modules having semiconductor switches and an energy store. Some switching modules are a first type and others are a second type. During operation, a positive switching module voltage, negative switching module voltage or zero voltage are generated at terminals of switching modules of the first type, and a positive switching module voltage or zero voltage are generated at terminals of switching modules of the second type. Upon detecting a DC voltage side fault, switching modules of the first type are actuated such that the polarity of their energy store voltages corresponds to the polarity of a fault current, and energy stores of switching modules of the first type are charged to a voltage exceeding their rated voltage. A converter assembly carrying out the method is also provided.