Power System Oscillation Dynamics and Source Localization

Power system oscillations arise from the dynamic interaction of generators, loads and control devices in interconnected networks. These oscillations may be categorised as natural modes, driven by inherent electromechanical dynamics, or forced modes, imposed by external periodic disturbances. Unchecked low-frequency oscillations can degrade system stability, reduce transmission capacity and damage equipment. Source localisation—the identification of the plant, converter or network element initiating an oscillation—has become essential for timely mitigation. Advances in signal processing, model-based estimation and real-time monitoring now permit high-fidelity tracking of modal behaviour across wide-area networks. Phasor measurement units (PMUs) and wide-area monitoring systems (WAMS) deliver synchronised data streams that underpin modal decomposition, energy‐based methods and pattern-recognition algorithms. Accurate localisation of oscillation sources enables targeted control actions, such as modulation of inverter outputs, tuning of power system stabilisers or activation of supplementary damping controllers. As renewable penetration increases and inertia declines, the interplay of inter-area modes and converter dynamics demands ever more sophisticated analytical tools to safeguard global power flows and ensure reliable operation.

Research from Nature Portfolio

Recent studies have demonstrated the effectiveness of integrating PMU-based state estimation with model-predictive damping controllers. A novel methodology employs a WAMS-driven power system model to isolate low-frequency oscillation contributors in real time. By analysing modal participation factors derived from synchronised measurements, this approach pinpoints generators or inverters exhibiting poor damping performance. A proportional–resonant power system stabiliser is then tuned using the estimated mode shapes, successfully suppressing both forced and inter-area oscillations without reliance on detailed network topology. Field trials have confirmed the capacity of this framework to improve damping ratios across diverse system configurations, illustrating its potential for global deployment in grids with high renewable share.

Power System Oscillation Dynamics and Source Localization publication trend

The graph below shows the total number of articles in power system oscillation dynamics and source localization across all publications each year (not limited to Nature Index journals).

Technical terms

Forced oscillation (FO): Sustained power swings driven by external periodic disturbances rather than natural modes.

Natural oscillation: Inherent low-frequency modes arising from electromechanical coupling of generators and loads.

Phasor Measurement Unit (PMU): Device that provides time-synchronised voltage and current phasors for wide-area monitoring.

Wide-Area Monitoring System (WAMS): Networked infrastructure that collects and analyses synchronised measurements to monitor system dynamics.

Mode shape: Spatial distribution of oscillation amplitude and phase across the network, used to identify modal contributors.

References

1. A Comprehensive Method to Mitigate Forced Oscillations in Large Interconnected Power Grids. IEEE Access (2021).
2. A Hybrid Energy and Mode Decomposition-Based Method for Evaluating Generators Damping in Multi-Machine Power Systems. IEEE Access (2021).
3. Self‐sustained low‐frequency oscillation and its suppression in a practical AC/DC distribution network. IET Generation Transmission & Distribution (2022).
4. Identification and suppression of low-frequency oscillations using PMU measurements based power system model in smart grid. Scientific Reports (2025).