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

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.

Automated summary

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.