• Session Materials
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Subsynchronous Neutrality of Series Compensated Lines

Ref C4_10676_2026 • 2026
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Summary

The application of series capacitor banks in high-voltage transmission systems, while beneficial, can lead to the well-known phenomena of subsynchronous resonance (SSR) and subsynchronous control interaction (SSCI), generally referred to Subsynchronous oscillations

(SSO) for the purpose of this paper. Subsynchronous oscillations can lead to unstable system conditions, high voltage and/or current conditions, and potential damage to generation or transmission equipment if not mitigated or isolated. While it is impossible to design a series compensated system that will be completely immune to SSO contributions under any future configurations, this paper will present a definition for SSO neutral series compensation systems including describing SSO screening methods and various mitigation strategies.

Additional informations

Publication type Session Materials
Reference C4_10676_2026
Publication year
Publisher CIGRE
Country United States of America
Study committees
  • Power system technical performance (C4)
File size 954 KB
Price for non member 30 €
Price for member 30 €

Authors

DATKA Paul - GE Vernova, United States of America; GRAY Bevan - GE Vernova, United States of America; ENGLISH Bruce - GE Vernova, United States of America; ARMAN Nasheet - GE Vernova, United States of America

Keywords

Series Compensation - Subsynchronous Resonance - Subsynchronous Control Interaction - Subsynchronous Oscillations - Neutrality

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Subsynchronous Neutrality of Series Compensated Lines