Abb Schweiz Ag

Christian Meier

Tobias Geyer

Mario Schweizer

Frederick Kieferndorf

Ioannis Tsoumas

Manuel Vetterli

Wim Van-der-Merwe

Eduardo Rohr

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 Vof the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.

Method for operating a power electronic converter device with floating cells

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Ennetbaden, Switzerland

Christian Meier