Compensating Frequency Converter Nonlinearity

Voltage and/or current of multiphase systems are usually controlled using frequency converters (FCs). Typically, these FCs consist of several half bridges and, due to their working principle, their output voltage will depend on the output current nonlinearly. Many well known compensation methods (CM...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2025-01, Vol.40 (1), p.691-703
Main Authors: Baumgartner, Thomas, Seeber, Richard, Bauer, Robert, Horn, Martin
Format: Article
Language:English
Subjects:
Bridge circuits
Clamps
Compensation
Current measurement
dead time
distortion
Frequency conversion
half bridge model
Hardware
IGBT
interlock time
nonlinearity
Switches
Symbols
Tuning
Voltage
Voltage measurement
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Description
Summary:Voltage and/or current of multiphase systems are usually controlled using frequency converters (FCs). Typically, these FCs consist of several half bridges and, due to their working principle, their output voltage will depend on the output current nonlinearly. Many well known compensation methods (CMs) rely on the assumption that the current is nearly constant during one switching cycle. However, with decreasing load inductances this assumption may not be fulfilled and therefore these methods may not succeed in achieving full compensation. This contribution provides a CM, which takes the so-called ripple current into account and is therefore especially useful when dealing with small load inductances.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3476160