Work

A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance

Year: 2025

Type: article

Abstract: The phenomenon of subsynchronous resonance (SSR) in multi-generator system is inherently complex and challenging to analyze. This complexity arises primarily from the interactions between generators, particularly those sharing close torsional frequencies, which have not been sufficiently addressed. Furthermore, the influence of these interactions on SSR remains inadequately explained. As a result, existing methods for assessing SSR risk often fail to strike an optimal balance between accuracy and computational efficiency. In this paper, a simplified complex torque coefficient method is proposed, and an analytic formula for the generator’s electrical damping is derived for multi-generator system. This formula, which incorporates terms related to shaft dynamics, elucidates how rotor angle interactions influence damping and contribute to SSR. Based on these interactions, a systematic procedure is introduced for evaluating the risk of SSR in multi-generator systems. The eigenvalue calculation and time-domain simulations verify the effectiveness of evaluation procedure and the conclusions presented in the paper.

Source: International Journal of Electrical Power & Energy Systems

DOI: 10.1016/j.ijepes.2025.110914

Authors: Xin Zhao, Haixiang Xie, Xi Wu, Shan Gao, Ruoying Yu

Institutions: Southeast University, China Electric Power Research Institute

Language: English

Topic: Power System Optimization and Stability

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,920