公开(公告)号：US20230042964A1

公开(公告)日：2023-02-09

申请号：US17789586

申请日：2020-12-17

Applicant: ABB Schweiz AG

Inventor： Ioannis Tsoumas ,  Tobias Geyer ,  Mario Schweizer ,  Eduardo Rohr ,  Frederick Kieferndorf ,  Wim Van-der-Merwe ,  Manuel Vetterli ,  Christian Meier

IPC: H02M7/487 ,  H02M7/5395 ,  H02M1/12

Abstract: Described herein is a method of operating a power electronic converter device for an electrical power conversion system. The power electronic converter device includes a converter circuit including an input side, an output side, a first converter, and at least one second converter. The second converter includes at least one floating cell with a DC intermediate circuit and semiconductor devices. The method includes: switching the semiconductor devices of the floating cell at switching instants determined with optimized pulse patterns or carrier-based pulse width modulation; determining a fundamental voltage component for the floating cell; and generating the fundamental voltage component in the actual voltage of the floating cell by modifying the switching instants, such that a voltage VC AF of the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.