Digital current control in a rotating reference frame - Part I: System modeling and the discrete time-domain current controller with improved decoupling capabilities

Digital current control of three-phase voltage-source power electronic converters is analyzed. Special attention is paid to the exact discrete time-domain modeling of inductive-resistive current dynamics in the rotating reference frame whereas three different regular sampling strategies are incorpor...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-07, Vol.31 (7), p.5290-5305
Main Authors: Hoffmann, Nils, Fuchs, Friedrich W., Kazmierkowski, Marian P., Schroder, Dierk
Format: Article
Language:English
Subjects:
Control systems
Controllers
Current control
Decoupling
Digital
digital modulation
discrete-time systems
Dynamical systems
Dynamics
Electric currents
Electrical equipment
Frequency conversion
Logic gates
Mathematical models
Pulse width modulation
Pulse width modulation converters
Rotating
sampling methods
Strategy
Switches
Time-domain analysis
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Summary:Digital current control of three-phase voltage-source power electronic converters is analyzed. Special attention is paid to the exact discrete time-domain modeling of inductive-resistive current dynamics in the rotating reference frame whereas three different regular sampling strategies are incorporated to the analysis. The exact system model motivates the development of a new current control structure in the rotating reference frame that is based on discrete time-domain analysis. Ideally, the new discrete time-domain current controller leads to a full compensation of all cross-coupling effects that appear in the controlled system. The experimental results (performed on a 22 kW test-bench) reveal that even under test conditions an excellent decoupling capability of the presented controllers is achieved.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2015.2481726