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Mode Identification and Damping Torque Analysis of Ultra-Low Frequency Oscillations
2019 IEEE Sustainable Power and Energy Conference (iSPEC), 2019After the asynchronous interconnection of Yunnan and South China Power Grid, a long period of ultra-low frequency oscillation occurred, which seriously affected the safe and stable operation of the system. This paper presents the damping analysis of hydraulic turbine governing systems under ultra-low frequency oscillations.
Junfeng Zhang +4 more
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Ultra low frequency CMOS ring oscillator design
2014 Recent Advances in Engineering and Computational Sciences (RAECS), 2014In this paper, the concept of CMOS thyristor has been used to implement low frequency ring oscillator using 2.5 volt power-supply and 1pF load capacitance using 250nm technology. By using the conventional CMOS thyristor structure the frequency of the output sinusoidal waveform is of the order of KHz, which has been further improved in proposed CMOS ...
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Analysis of ultra-low frequency oscillation in yunnan asynchronous sending system
2017 IEEE Power & Energy Society General Meeting, 2017Yunnan power grid has a large-scale hydropower station whereby the power generated at the station is been transmitted via high-voltage direct current (HVDC) transmission lines under asynchronous operation mode. In the system performance test of Yunnan asynchronous operation, 0.05 Hz ultra-low frequency oscillation occurred in the grid.
Yiping Chen +6 more
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Ultra Low-Frequency Oscillations of a Solar Filament Observed by the GONG Network
Solar Physics, 2016The data of ground-based telescopes of the Global Oscillation Network Group (GONG) obtained in the $\mathrm{H}\upalpha$ line provide an opportunity to study the long-period oscillations of chromospheric ...
V. I. Efremov +2 more
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Ultra-Low Frequency Oscillation Damping Control Method for Hydro-Photovoltaic Integrated Systems
IEEE Transactions on Power ElectronicsXiangyu Wu, Yin Xu, Sijia Wang
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An ultra-low frequency ring oscillator with programmable tracking using a phase-locked loop
2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS), 2012This paper presents a programmable ultra-low frequency ring oscillator designed in a 0.5µm CMOS technology with 3.3 V power supply. In normal operation, the oscillator produces a periodic signal without external inputs (other than power and ground).
Tsung-Hsueh Lee, Pamela Abshire
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Suppression Strategy of Ultra-Low Frequency Oscillation in Yunnan Power Grid with BESS
2019 North American Power Symposium (NAPS), 2019Many problems related to power system frequency have occurred in Yunnan Province ─a province in southwestern China with high proportion of hydro-turbine generators. Yunnan Power Grid is a typical direct-current (DC) sending grid and the installed capacity of hydro-generators has accounted for more than 70% of the total capacity after asynchronous ...
Yixuan Chen +5 more
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Ultra Low Frequency Low Power CMOS Oscillators for MPPT and Switch Mode Power Supplies
2018 14th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME), 2018This paper presents the design of two low power consumption analog oscillators implemented in a $0 . 35\mu \mathrm {m}$ CMOS technology. These oscillators were designed for a power conditioning circuit with an analogue Perturbation and Observation (P&O) Maximum Power Point Tracker (MPPT) to maximize the scavenged power generated by energy harvesting ...
Francarl Galea +4 more
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Ultra Low Frequency Low Power Oscillator using Ultra-Capacitor and Advanced Flywheel
2018 International Conference on Smart Electric Drives and Power System (ICSEDPS), 2018Ultra-low-frequencies (< 1.0 Hz) are required for signal transmission in rocky layers for seismic studies. This frequency region is tougher to work on. Various methods of generating these frequencies have been in use since several years. In electrical science, it has been known ever-since that energy in electric field of a capacitor and energy in ...
Rohan Bherde +2 more
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Oscillation Source Location of Ultra-low Frequency Oscillations Based on Random Forest Algorithm
2022 International Conference on Cyber-Physical Social Intelligence (ICCSI), 2022Tao Zhou +4 more
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