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Stability of speed regulating system of hydropower station with surge tank considering nonlinear turbine characteristics

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  • Xu, Xinyu
  • Guo, Wencheng

Abstract

The paper investigates the stability of speed regulating system (SRS) of hydropower station with surge tank (HSST) considering nonlinear turbine characteristics. Firstly, the model of HSST considering nonlinear turbine characteristics is established. Then, both the theoretical analysis and example analysis are carried out to comprehensively explain the rule and essence of SRS stability of HSST. Finally, the effect mechanism of nonlinear turbine characteristics on stability of the SRS of HSST is revealed by using contrastive analysis. The results indicate that the nonlinear turbine characteristics are composed of nonlinear head characteristics and nonlinear speed characteristics. The emerged Hopf bifurcation of SRS of HSST is supercritical. The nonlinear speed characteristics of turbine almost have no effect on the stability and dynamic response of SRS. The effect of nonlinear turbine characteristics on stability and dynamic response of SRS is mainly realized by the nonlinear head characteristics of turbine. For the stability of the SRS of HSST, the nonlinear head characteristics of turbine is favorable under negative load disturbance and unfavorable under positive load disturbance. The rules for dynamic response of comprehensive characteristics coefficient of turbine reveal the effect mechanism of nonlinear turbine characteristics on stability of SRS of HSST.

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  • Xu, Xinyu & Guo, Wencheng, 2020. "Stability of speed regulating system of hydropower station with surge tank considering nonlinear turbine characteristics," Renewable Energy, Elsevier, vol. 162(C), pages 960-972.
    • Handle: RePEc:eee:renene:v:162:y:2020:i:c:p:960-972
    DOI: 10.1016/j.renene.2020.08.098
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    References listed on IDEAS

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    4. Guo, Wencheng & Peng, Zhiyuan, 2019. "Hydropower system operation stability considering the coupling effect of water potential energy in surge tank and power grid," Renewable Energy, Elsevier, vol. 134(C), pages 846-861.
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    6. Wencheng Guo, 2019. "A Review of the Hydraulic Transient and Dynamic Behavior of Hydropower Plants with Sloping Ceiling Tailrace Tunnels," Energies, MDPI, vol. 12(17), pages 1-28, August.
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    2. Xu, Pan & Fu, Wenlong & Lu, Qipeng & Zhang, Shihai & Wang, Renming & Meng, Jiaxin, 2023. "Stability analysis of hydro-turbine governing system with sloping ceiling tailrace tunnel and upstream surge tank considering nonlinear hydro-turbine characteristics," Renewable Energy, Elsevier, vol. 210(C), pages 556-574.
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    5. Wencheng Guo & Yang Liu & Fangle Qu & Xinyu Xu, 2020. "A Review of Critical Stable Sectional Areas for the Surge Tanks of Hydropower Stations," Energies, MDPI, vol. 13(23), pages 1-25, December.
    6. Nan Zhang & Xiaoming Xue & Na Sun & Yanhui Gu & Wei Jiang & Chaoshun Li, 2022. "Nonlinear Modeling and Stability of a Doubly-Fed Variable Speed Pumped Storage Power Station with Surge Tank Considering Nonlinear Pump Turbine Characteristics," Energies, MDPI, vol. 15(11), pages 1-24, June.
    7. Chen, Zi & Guo, Wencheng, 2023. "Stability and dynamic response of two-stage hydropower stations cascaded by regulating reservoir," Renewable Energy, Elsevier, vol. 202(C), pages 651-666.
    8. Zhang, Nan & Feng, Chen & Shan, Yahui & Sun, Na & Xue, Xiaoming & Shi, Liping, 2023. "A universal stability quantification method for grid-connected hydropower plant considering FOPI controller and complex nonlinear characteristics based on improved GWO," Renewable Energy, Elsevier, vol. 211(C), pages 874-894.
    9. Cui, Zilong & Guo, Wencheng, 2023. "Multi-objective control of transient process of hydropower plant with two turbines sharing one penstock under combined operating conditions," Renewable Energy, Elsevier, vol. 206(C), pages 1275-1288.
    10. Ma, Weichao & Yan, Wenjie & Yang, Jiebin & He, Xianghui & Yang, Jiandong & Yang, Weijia, 2022. "Experimental and numerical investigation on head losses of a complex throttled surge tank for refined hydropower plant simulation," Renewable Energy, Elsevier, vol. 186(C), pages 264-279.
    11. Tan, Xiaoqiang & Li, Chaoshun & Liu, Dong & Wang, He & Xu, Rongli & Lu, Xueding & Zhu, Zhiwei, 2023. "Multi-time scale model reduction strategy of variable-speed pumped storage unit grid-connected system for small-signal oscillation stability analysis," Renewable Energy, Elsevier, vol. 211(C), pages 985-1009.

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