METHOD FOR OPERATING A POWER ELECTRONIC CONVERTER DEVICE WITH FLOATING CELLS
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United States of America Patent
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Issued Date -
Feb 9, 2023
app pub date -
Dec 17, 2020
filing date -
Dec 17, 2020
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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.
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