4.8 Article

Settling-Angle-Based Stability Analysis for Multiple Current-Controlled Converters

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 11, Pages 12992-12997

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3185141

Keywords

Current-controlled converter (CCC); dq-frame impedance; generalized Nyquist criterion; impedance-based stability analysis

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This study proposes a new settling-angle-based stability criterion for analyzing nonminimum phase power systems with multiple current-controlled converters. By comparing the settling angles of the system and its subsystems, the stability of the system can be accurately assessed and resonance sources identified.
This letter proposes a settling-angle-based stability criterion, as the extension of determinant-based general Nyquist criterion, to facilitate the stability analysis of nonminimum phase power systems with multiple current-controlled converters. Using only the phase information of converter impedance in the dq-frame, the proposed stability criterion can accurately demonstrate the system stability and identify resonance sources according to the settling angles of the overall system and its subsystems, which are validated by simulation and control hardware-in-the-loop results.

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