Summary
The increasing penetration of renewable energy sources has intensified low-frequency oscillation challenges in modern power systems due to reduced system inertia and higher variability. Accurate and timely identification of oscillation sources is therefore essential for maintaining system stability. This paper presents a real-time oscillation source identification method based on Dissipating Energy Flow (DEF) analysis using Wide Area Monitoring System
Read more Read less(WAMS) data. The proposed approach calculates DEF from voltage and current phasors, enabling practical implementation without requiring a complete system model. A Python-based tool was developed following a five-step methodology, including oscillation detection, frequency estimation, signal filtering, DEF computation, and source localization.
The method was validated through simulations on the IEEE 39-bus test system, achieving 100% accuracy. In addition, analysis of 18 historical oscillation events in Thailand’s northeastern region achieved an identification accuracy of 84%, with misidentifications mainly attributed to
Phasor Measurement Unit (PMU) data quality and analysis window selection. The approach was subsequently deployed in Thailand’s real-time system, providing oscillation source identification within 30 seconds to 1 minute after event occurrence and achieving 87% accuracy. Field application enabled timely corrective actions, such as Power System Stabilizer
(PSS) tuning adjustments, demonstrating the effectiveness of the proposed method in enhancing real-time grid stability and operational reliability.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | C4_12063_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Thailand |
| Study committees |
|
| File size | 9 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
BURITATHAM Natthawut; PATCHANEE Sirikullaya; SAWATPIPAT Panat; BUREETAN Yossawin; PUKPRAYURA Agapol
Keywords
Dissipating Energy Flow (DEF), Source of Oscillation, Wide Area Monitoring System (WAMS)
