公开(公告)号：US20190190397A1

公开(公告)日：2019-06-20

申请号：US16272234

申请日：2019-02-11

Applicant: ABB Schweiz AG

Inventor： Wim Van-Der-Maerwen ,  Tobias Geyer ,  Mario Schweizer ,  Ioannis Tsoumas

IPC: H02M5/458 ,  H02M7/487 ,  H02M7/49

CPC classification number: H02M5/4585 ,  H02M7/487 ,  H02M7/49

Abstract: A method for controlling a converter system includes: determining, with a first controller stage, an output voltage reference for the converter system; generating, with the first controller stage, switching commands for a main converter based on the output voltage reference, such that the main converter converts an input voltage into an intermediate voltage provided at an output of the main converter and following the output voltage reference; and generating, with a second controller stage, switching commands for a floating converter cell connected to the output of the main converter, such that the floating converter cell converts the intermediate voltage into an output voltage provided at an output of the floating converter cell, wherein the floating converter cell comprises a cell capacitor and a semiconductor switch arrangement for connecting and disconnecting the cell capacitor between the output of the main converter and the output of the floating converter cell.