TY - GEN
T1 - Eigenvalue Analysis and Sequence Impedance Modeling of Turbo-Generators
AU - Zhang, Pengfei
AU - Duan, Jiandong
AU - Li, Yuhui
AU - Mu, Tiancheng
AU - Shao, Bo
N1 - Publisher Copyright:
© Beijing Paike Culture Commu. Co., Ltd. 2026.
PY - 2026
Y1 - 2026
N2 - This paper presents a comprehensive mathematical modeling approach for turbo-generators, encompassing the governor system, turbine prime mover, shaft system, and synchronous generator. A 16th-order state-space model is derived, and eigenvalue analysis is conducted to reveal the existence and physical mechanisms of sub-synchronous torsional modes with low damping. Based on linear system theory, the state-space model is transformed into a d-q axis port impedance model, which is further decoupled into sequence impedances by coordinate transformation, explicitly considering frequency coupling effects between positive and negative sequences. Finally, using IEEE standard parameters, frequency-scan validation of the positive-sequence port impedance is carried out on an electromagnetic simulation platform. The results demonstrate a high degree of agreement between the theoretical model and simulation across the entire frequency range, confirming the validity of the proposed model and analytical method. This work provides a theoretical foundation and engineering reference for sub-synchronous oscillation analysis and impedance-based stability assessment of turbo-generators.
AB - This paper presents a comprehensive mathematical modeling approach for turbo-generators, encompassing the governor system, turbine prime mover, shaft system, and synchronous generator. A 16th-order state-space model is derived, and eigenvalue analysis is conducted to reveal the existence and physical mechanisms of sub-synchronous torsional modes with low damping. Based on linear system theory, the state-space model is transformed into a d-q axis port impedance model, which is further decoupled into sequence impedances by coordinate transformation, explicitly considering frequency coupling effects between positive and negative sequences. Finally, using IEEE standard parameters, frequency-scan validation of the positive-sequence port impedance is carried out on an electromagnetic simulation platform. The results demonstrate a high degree of agreement between the theoretical model and simulation across the entire frequency range, confirming the validity of the proposed model and analytical method. This work provides a theoretical foundation and engineering reference for sub-synchronous oscillation analysis and impedance-based stability assessment of turbo-generators.
KW - Eigenvalue analysis
KW - Sequence impedance
KW - Turbo-generator
UR - https://www.scopus.com/pages/publications/105039269335
U2 - 10.1007/978-981-95-7334-9_12
DO - 10.1007/978-981-95-7334-9_12
M3 - 会议稿件
AN - SCOPUS:105039269335
SN - 9789819573332
T3 - Lecture Notes in Electrical Engineering
SP - 108
EP - 115
BT - The Proceedings of the 20th Annual Conference of China Electrotechnical Society
A2 - Yang, Qingxin
A2 - Xu, Dianguo
A2 - Ye, Xuerong
A2 - Nie, Qiuyue
A2 - Guan, Yueshi
PB - Springer Science and Business Media Deutschland GmbH
T2 - 20th Annual Conference of China Electrotechnical Society, ACCES 2025
Y2 - 19 September 2025 through 21 September 2025
ER -