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A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression

Author

Listed:
  • Yong Jia

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Bangwei Tan

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Wentao Zhang

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Dongrong Jiang

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Chao Yang

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Yunhao Wen

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

Abstract

In response to the requirements of mitigating ultra-low frequency oscillation (ULFO) and enhancing primary frequency regulation (PFR) performance in hydropower-dominated systems, a novel control strategy, namely the center-frequency-structured governor-side power system stabilizer (CFS_GPSS) is proposed. In this study, the transfer function model of the hydropower system with a proportional-integral-derivative (PID)-type governor is established. Through analysis of damping torque and amplitude-frequency characteristics, the dominant links and key characteristics of ULFO are revealed. Based on these findings, a CFS_GPSS strategy is proposed to compensate for the phase and increase system damping. Finally, the effectiveness of the CFS_GPSS is verified under normal operating conditions of 0.04 Hz, strong network and low hydropower output conditions of 0.034 Hz, and weak grid-connected conditions of 0.054 Hz based on the 3-machine, 9-bus system. Compared to the conventional structured governor-side power system stabilizer (CS_GPSS) control strategy and PID parameter optimization method, the CFS_GPSS demonstrates efficient ULFO suppression across a wide frequency range while significantly enhancing PFR performance. The proposed control strategy exhibited the expected performance under various operating conditions, providing effective technical means to enhance the reliability of hydraulic turbines and guide the safe and stable operation of hydropower-dominated systems.

Suggested Citation

  • Yong Jia & Bangwei Tan & Wentao Zhang & Dongrong Jiang & Chao Yang & Yunhao Wen, 2024. "A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression," Energies, MDPI, vol. 17(5), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1067-:d:1344747
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    References listed on IDEAS

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    3. Chen, Jinbao & Zheng, Yang & Liu, Dong & Du, Yang & Xiao, Zhihuai, 2023. "Quantitative stability analysis of complex nonlinear hydraulic turbine regulation system based on accurate calculation," Applied Energy, Elsevier, vol. 351(C).
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