Results 1 to 10 of about 129 (104)
Study on stability margin of ultra-low frequency oscillation in hydropower system
Energy Reports, 2023 In recent years, the ultra-low frequency oscillation of power system caused by hydropower units has occurred frequently. It is very important to study the ultra-low frequency oscillation characteristics of hydropower stations for the stable operation of ...
Fan Tang +8 more
doaj +4 more sources
The occurrence mechanism and damping method of ultra‐low‐frequency oscillations [PDF]
IET Renewable Power Generation, 2021 The ultra‐low‐frequency oscillation (ULFO) problem has reappeared in China recently. Although the hydraulic generator is supposed to have a strong connection to this problem, the conditions for ULFO appearance and detailed reasons are not clear yet.
Peng Wang +6 more
doaj +7 more sources
Applied Sciences, 2023 Aiming at the problem of ultra-low-frequency oscillation (ULFO) in power systems, with an oscillation frequency lower than 0.1 Hz, an oscillation suppression control method is proposed. Firstly, the mathematical modeling of the system is carried out, and
Xueyang Zeng +4 more
doaj +3 more sources
Journal of Modern Power Systems and Clean Energy, 2015 The low frequency oscillation characteristics of East China Power Grid after commissioning of the first ultra-high voltage alternating current (UHVAC) project-the Huai-Hu UHVAC project are studied. Several low frequency oscillation cases occurred in East
Chao Wang +7 more
doaj +3 more sources
Ultra Low Frequency Wave Produced by Underwater Oscillating Sphere and Its Measurement [PDF]
Journal of Marine Science and Engineering, 2021 When an underwater target moves in viscous fluid, it may cause the periodic movement of the surrounding fluid and generate ultra-low-frequency (ULF) gravity waves.
Huan Wang +4 more
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On the Relationship between Ultra Low Frequency Oscillation and Power System Inertia
2023 IEEE Power & Energy Society General Meeting (PESGM), 2023 Peer ...
Matti Lehtonen, Liisa Haarla
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Ultra-low frequency oscillation analysis considering thermal-hydro power proportion
International Journal of Electrical Power and Energy Systems, 2023 The Ultra-low Frequency Oscillation (ULFO) has attracted much attention due to its field test capture in China, and it is believed that the ULFO is related to the hydraulic generator. To clarify the cause and innate essence of ULFO, the develop of the ULFO under different thermal-hydro power proportions is investigated.
Qin Jiang, Baohong Li, Tianqi Liu
exaly +2 more sources
EnergiesAiming at the problem of ultra-low-frequency oscillation (ULFO) caused by an irrational setting of governor parameters of high-head hydraulic turbine units, this paper proposes a method to optimize the additional damping control parameters of the ...
Sixiang Zhang +8 more
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EnergiesIn 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 ...
Yong Jia +5 more
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Ultra-low frequency oscillation analysis and robust fixed order control design
International Journal of Electrical Power and Energy Systems, 2019 Abstract Yunnan Grid, a hydro-dominated system, has experienced many times ultra-low frequency oscillations (ULFO) since the grid is connected to the China Southern Grid via DC ties in 2016. The root cause of the oscillation phenomena is investigated in this work.
Chongxi Jiang +2 more
exaly +2 more sources