Summary

Immittance-based frequency-domain analysis has been widely applied in the assessment of electrical and converter-driven resonance stability. This paper extends the scope of this method by introducing its application to torsional resonance stability, thereby establishing a unified analytical framework for evaluating both electrical and mechanical resonance phenomena. The proposed framework integrates theoretical foundations with structured methodological procedures, enabling a systematic approach to resonance stability assessment in frequency domain. To demonstrate its practical relevance, the framework is evaluated through detailed case studies based on the Swedish transmission system and Electromagnetic Transient (EMT) simulations. The results confirm the method’s accuracy and effectiveness, providing empirical evidence and critical insights that highlight its potential as a comprehensive tool for torsional resonance stability analysis.

Additional informations

Publication type Session Materials
Reference C4_11610_2026
Publication year
Publisher CIGRE
Country Sweden
Study committees
  • Power system technical performance (C4)
File size 855 KB
Price for non member 30 €
Price for member 30 €

Authors

BEHROUZIAN Ehsan - Svenska kraftnät; ROGERSTEN Robert - Svenska kraftnät; LENNERHAG Oscar - Svenska kraftnät

Immittance-based frequency-domain method for sub synchronous torsional resonance analysis