2025年8月7日 周四
Home > Archive>Volume 40, Issue 1, 2025 >29-38. DOI:10.19781/j.issn.1673-9140.2025.01.003
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A method for suppressing ultra‑low‑frequency oscillations in high hydroelectric power systems based on DC additional frequency control
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Affiliation:

(1.School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068,China;2.Lingyun Science & Technology Group Co.,Ltd.，Dangyang 444100,China)

Clc Number:

TM761

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    Abstract:

    With the continuous advancement of flexible direct current (DC) asynchronous interconnection projects, the ultra-low-frequency oscillation problem caused by the high proportion of hydropower poses a threat to the frequency stability of the power system. To suppress the occurrence of these oscillations, an additional frequency control strategy based on a flexible DC transmission is proposed, which is also referred to as a voltage source converter-based high-voltage DC transmission (VSC-HVDC) system. Firstly, a frequency response model that includes both hydro and thermal power units is constructed. The formation mechanism of ultra-low-frequency oscillation is identified through damping torque analysis, and the influence of various governor parameters and different hydropower ratios on the occurrence of ultra-low-frequency oscillations in the system is explored. Secondly, based on the coupling characteristics of DC capacitor voltage and alternating current system frequency, the mechanism of the converter station participating in suppressing ultra-low-frequency oscillation is studied. A control method for virtual inertia and VDC-f droop of the converter station is proposed, and the virtual inertia and droop parameters are designed under constraint conditions. Finally, based on the MATLAB/SIMULINK platform, a load frequency control model that includes both hydro and thermal power units is constructed, and the effectiveness of the proposed method is verified by comparing the optimization methods of water turbine parameters.

    Reference
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赵熙临,赵宇翔,李 品.基于直流附加频率控制的高水电占比电力系统超低频振荡抑制方法[J].电力科学与技术学报英文版,2025,40(1):29-38. ZHAO Xilin, ZHAO Yuxiang, LI Pin. A method for suppressing ultra‑low‑frequency oscillations in high hydroelectric power systems based on DC additional frequency control[J]. Journal of Electric Power Science and Technology,2025,40(1):29-38.

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