Open Access

ARTICLE

Localization of Sub-Synchronous Oscillation Disturbance Sources in Grid-Integrated Energy Storage Power Systems Based on Energy Function Modes

Rundong Tian^*, Yuhan Feng, Yuchi Zhang, Weiwei Yang, Cheng Liu, Fengxiang Pei
The Department of Electrical Engineering, Northeast Electric Power University, Jilin, China
* Corresponding Author: Rundong Tian. Email:

Energy Engineering https://doi.org/10.32604/ee.2026.082632

Received 19 March 2026; Accepted 16 April 2026; Published online 18 May 2026

Abstract

This paper proposes a method for constructing sub-synchronous modal energy based on an equivalent energy model, which is used for the source localization analysis of sub-synchronous oscillations (SSO) in systems incorporating grid-connected energy storage. First, a sub-synchronous oscillation model for virtual synchronous generator (VSG)-based energy storage in grid-connected energy storage systems is established using the equivalent energy model. Based on sub-synchronous modal energy, energy functions for each component of the VSG-based energy storage system are derived. Building on this, a sub-synchronous oscillation disturbance localization method based on energy function modes is proposed. By monitoring the trends in energy function changes across different control stages, the role of each control stage in sub-synchronous oscillations can be determined, and the disturbance source can be localized. Furthermore, the oscillation localization analysis method proposed in this paper enables the assessment of the oscillation participation of each equipment stage during sub-synchronous oscillations and the identification of critical stages. Finally, the proposed method is validated through scenarios involving disturbance sources in control loops of different grid configurations, and the simulation results confirm the effectiveness of the proposed method.

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Keywords

Sub-synchronous oscillation; disturbance source; sub-synchronous equivalent energy; mode; network configuration

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