Influence of the ICFF Decoupling Technique on the Stability of the Current Control Loop of a Grid-Tied VSC

The control scheme of grid-tied converters is often implemented in the dq-frame due to simplicity of design. However, with this transformation, there exists an inherent cross-coupling term between the d-and q-channels which is often compensated for by using a feed-forward term in the current-control...

Full description

Saved in:
Bibliographic Details
Published in2019 IEEE Energy Conversion Congress and Exposition (ECCE) pp. 2622 - 2628
Main Authors Marin, Leonardo, Tarraso, Andres, Candela, Ignacio, Rye, Rebecca, Rodriguez, Pedro
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2019
Subjects
eigenvalues
generalized Nyquist criterion
impedance-based
inductor current feed-forward
small-signal
state-space
Online AccessGet full text

Cover

More Information
Summary:The control scheme of grid-tied converters is often implemented in the dq-frame due to simplicity of design. However, with this transformation, there exists an inherent cross-coupling term between the d-and q-channels which is often compensated for by using a feed-forward term in the current-control loop. It is shown, by applying the generalized Nyquist criterion (GNC) to the dq-frame ac impedance of the converter, that the inclusion of this decoupling term, in fact, degrades the stability of the controller when increasing the bandwidth of the synchronous reference frame phase-locked loop (SRF-PLL). Harware-in-the-loop (HIL) experiments are also conducted and verify these results.
ISSN:2329-3748
DOI:10.1109/ECCE.2019.8912576