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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems
2024 6th International Conference on Power and Energy Technology (ICPET)Kesu Cai +5 more
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Research on Damping Control Index of Ultra-Low-Frequency Oscillation in Hydro-Dominant Power Systems
Sustainability, 2020 In recent years, ultra-low-frequency oscillation (ULFO) is a prominent problem in power systems of dominant hydropower. In order to suppress ULFO, the most effective strategy is the governor parameters optimization to improve the system damping within ...
Gang Chen, Chang Liu, Chengwei Fan
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A CMOS Integrated Low-Power, Ultra-Low-Frequency Relaxation Oscillator for Neuromorphic Applications
2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), 2021In the emulation of dynamic activities of neurons, relaxation oscillator plays a decisive role in the form of frequency coding and frequency synchronization. This paper presents a programmable ultra-low-frequency relaxation oscillator for neuromorphic network applications. The oscillator adopts a 250 pA charging current to achieve ultra-low oscillation
Xiaoyan Cheng +3 more
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Limit cycle in the ultra-low-frequency oscillation of islanded power systems
2017 13th IEEE International Conference on Control & Automation (ICCA), 2017Ultra-low-frequency oscillation with almost constant amplitude is a kind of frequency oscillation in power system. It has occurred in several hydro-dominant islanded power systems. With the nonlinearity of hydraulic turbines, a nonlinear model of power system is built in the paper.
Xiaomin Lu +4 more
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Mechanism and Measurement of Ultra-Low-Frequency Oscillations in Asynchronous Networks
2018 IEEE Power & Energy Society General Meeting (PESGM), 2018The asynchronous interconnection mode between the Yunnan Province Power Grid and China Southern Power Grid was implemented in 2016. However, during the practical experiment of raising HVDC power in the asynchronous mode, the frequency of the Yunnan Power Grid oscillated at ultra-low frequency for a long period.
Chunxiao Liu +3 more
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Eigen Ultra-Low-Frequency Magnetosonic Oscillations of the Near Plasma Sheet
Cosmic Research, 2008A critical analysis of existing theories of the magnetospheric resonator for fast magnetosonic waves is performed. A new variant of the theory is suggested, according to which the near-Earth part of the plasma sheet plays the role of the resonator. It is shown that the magnetosonic wave is locked inside this region over its entire boundaries. The eigen
A. S. Leonovich, V. A. Mazur
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Ultra-Low-Frequency, Three-Phase Oscillator
Proceedings of the IRE, 1954This paper describes the design of a three-phase oscillator covering the range from 0.01 to 1,000 cycles per second. The problems peculiar to this frequency range, and their solutions, are discussed. Certain advantages inherent in three-phase operation are explained.
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Emergency Control Strategy of Ultra-low Frequency Oscillations Based on WAMS
2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia), 2019In this paper, an emergency control strategy of ultra-low frequency oscillations (ULFO) is presented. The multi-signal Prony algorithm is used to identify frequency signals from WAMS. Then the criterion of ULFO is proposed based on the Prony analysis results.
Qin LIU +7 more
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Analysis of the Influence of System Characteristics on Ultra-Low Frequency Oscillation
2019The ultra-low frequency oscillation phenomenon is not only related to the characteristics of the governor of the hydropower unit, but also closely related to the system characteristics. Based on the detailed analysis of the hydroelectric governor model, a simplified analysis model of the ultra-low frequency oscillation of the power grid is proposed ...
Xuelian Wu +3 more
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