A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance
The phenomenon of subsynchronous resonance (SSR) in multi-generator system is inherently complex and poses significant analytical challenges. This complexity arises primarily from the interactions among generators, particularly those sharing close torsional frequencies, which have not been sufficien...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
|
| Series: | International Journal of Electrical Power & Energy Systems |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525004624 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849768495491842048 |
|---|---|
| author | Xin Zhao Haixiang Xie Xi Wu Shan Gao Ruoying Yu |
| author_facet | Xin Zhao Haixiang Xie Xi Wu Shan Gao Ruoying Yu |
| author_sort | Xin Zhao |
| collection | DOAJ |
| description | The phenomenon of subsynchronous resonance (SSR) in multi-generator system is inherently complex and poses significant analytical challenges. This complexity arises primarily from the interactions among generators, particularly those sharing close torsional frequencies, which have not been sufficiently addressed. Moreover, the impact of these interactions on SSR remains inadequately explained. As a result, current SSR risk assessment methods often struggle to balance computational efficiency with modelling accuracy. 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 affect damping characteristics and contribute to SSR. Based on these interactions and their dominant influencing factors, a systematic procedure is developed to assess SSR risk in multi-generator systems. The effectiveness of this evaluation procedure is validated through eigenvalue analysis and time-domain simulations. Compared to existing methods, the proposed approach offers improved suitability for practical power system applications. |
| format | Article |
| id | doaj-art-c8474ddcb6534acfa1d63c7de01c117b |
| institution | DOAJ |
| issn | 0142-0615 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Electrical Power & Energy Systems |
| spelling | doaj-art-c8474ddcb6534acfa1d63c7de01c117b2025-08-20T03:03:46ZengElsevierInternational Journal of Electrical Power & Energy Systems0142-06152025-09-0117011091410.1016/j.ijepes.2025.110914A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonanceXin Zhao0Haixiang Xie1Xi Wu2Shan Gao3Ruoying Yu4School of Electrical Engineering, Southeast University, Nanjing 210096 Jiangsu, China; Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, Nanjing 210096 Jiangsu, China; Corresponding author at: School of Electrical Engineering, Southeast University, Nanjing 210096, Jiangsu, China.School of Electrical Engineering, Southeast University, Nanjing 210096 Jiangsu, ChinaSchool of Electrical Engineering, Southeast University, Nanjing 210096 Jiangsu, ChinaSchool of Electrical Engineering, Southeast University, Nanjing 210096 Jiangsu, China; Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, Nanjing 210096 Jiangsu, ChinaChina Electric Power Research Institute Nanjing Branch, Nanjing 210003 Jiangsu, ChinaThe phenomenon of subsynchronous resonance (SSR) in multi-generator system is inherently complex and poses significant analytical challenges. This complexity arises primarily from the interactions among generators, particularly those sharing close torsional frequencies, which have not been sufficiently addressed. Moreover, the impact of these interactions on SSR remains inadequately explained. As a result, current SSR risk assessment methods often struggle to balance computational efficiency with modelling accuracy. 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 affect damping characteristics and contribute to SSR. Based on these interactions and their dominant influencing factors, a systematic procedure is developed to assess SSR risk in multi-generator systems. The effectiveness of this evaluation procedure is validated through eigenvalue analysis and time-domain simulations. Compared to existing methods, the proposed approach offers improved suitability for practical power system applications.http://www.sciencedirect.com/science/article/pii/S0142061525004624Subsynchronous resonance (SSR)Simplified complex torque coefficient methodMulti-generator systemClose torsional frequenciesStability estimation |
| spellingShingle | Xin Zhao Haixiang Xie Xi Wu Shan Gao Ruoying Yu A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance International Journal of Electrical Power & Energy Systems Subsynchronous resonance (SSR) Simplified complex torque coefficient method Multi-generator system Close torsional frequencies Stability estimation |
| title | A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance |
| title_full | A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance |
| title_fullStr | A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance |
| title_full_unstemmed | A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance |
| title_short | A simplified complex torque coefficient method for analyzing and estimating the risk of multi-generator system subsynchronous resonance |
| title_sort | simplified complex torque coefficient method for analyzing and estimating the risk of multi generator system subsynchronous resonance |
| topic | Subsynchronous resonance (SSR) Simplified complex torque coefficient method Multi-generator system Close torsional frequencies Stability estimation |
| url | http://www.sciencedirect.com/science/article/pii/S0142061525004624 |
| work_keys_str_mv | AT xinzhao asimplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT haixiangxie asimplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT xiwu asimplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT shangao asimplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT ruoyingyu asimplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT xinzhao simplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT haixiangxie simplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT xiwu simplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT shangao simplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance AT ruoyingyu simplifiedcomplextorquecoefficientmethodforanalyzingandestimatingtheriskofmultigeneratorsystemsubsynchronousresonance |