Summary
Oscillations in electrical quantities are inherent to power systems and arise from interactions among system components, and are defined by the system’s electromechanical modes. Poorly damped oscillations can adversely affect power quality, equipment health, and the protection system. Since modal damping varies with operating conditions, continuous monitoring of system modes is essential for maintaining stability. Motivated by this, RTE, the French transmission system operator, has implemented an online Oscillation Monitoring System
Read more Read less(OMS) based on synchrophasor measurements. The OMS detects and tracks low-damped modes in real time and issues alarms to operators, enabling timely corrective actions. In particular, RTE adjusts the tie-line power flow between France and Spain to enhance damping of the problematic east–central–west mode. This paper presents RTE’s operational experience with the OMS, detailing its overall framework and the modal estimation algorithms it employs.
Three representative cases of low-damped modes, including the 2025 pre-Iberian blackout oscillations, are analyzed to illustrate the system’s performance. The paper also discusses practical challenges encountered in the online implementation of the OMS and outlines strategies adopted to overcome them.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | C2_10739_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | United States of America |
| Study committees | |
| File size | 1,012 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
GHIMIRE Saugat - Washington State University, United States of America; VENKATASUBRAMANIAN Vaithianathan - Washington State University, United States of America; TORRESAN Gilles - RTE, France; HIVART Stephane - RTE, France
Keywords
Oscillations - Operational Experience - Monitoring - Operator Alarms - Synchrophasors
