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Natural Frequencies of Simply Supported Arcs
The Journal of the Acoustical Society of America, 1971Natural frequencies of simply supported elastic arcs vibrating in the plane perpendicular to the plane of initial curvature are obtained by applying a method previously used by the authors to determine upper- and lower-bounds frequencies of curved beams.
Tish-Chun Chang, Enrico Volterra
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Enhanced Fast Frequency Support Schemes
2020 IEEE Power & Energy Society General Meeting (PESGM), 2020The increased penetration of large-scale renewable energy sources may result in ac grids with low inertia, where a sudden generation shortfall could lead to a high rate-of-change-of-frequency (RoCoF). Under such conditions, high-voltage direct-current (HVdc) links are expected to provide fast frequency support to contain frequency deviations within ...
Senthooran Balasubramaniam +6 more
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Minimally Supported Frequency Composite Dilation Wavelets
Journal of Fourier Analysis and Applications, 2009Recently, in response to the growing interest in oriented oscillatory waveforms, \textit{K. Guo, D. Labate, W.-Q. Lim, G. Weiss}, and \textit{E. Wilson} introduced a new class of representation systems called \textit{Affine Systems with Composite Dilations} [Electron. Res. Announc. Am. Math. Soc. 10, 78--87 (2004; Zbl 1066.42023); in: Harmonic analysis
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Optimal frequency support by dynamic demand
2013 IEEE Grenoble Conference, 2013A high penetration of renewable energy sources challenges future grid frequency control. Decentralized demand control can contribute to this frequency control. In this paper a method is proposed where residential demand is controlled to support the frequency.
S. Weckx, J. Driesen, R. D'hulst
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Frequency Trajectory Planning Based Transient Frequency Support of D-PMSG
2020 4th International Conference on HVDC (HVDC), 2020The grid connection of large-scale wind power will reduce the equivalent inertia and damping of the system, resulting in a decrease in system frequency stability. The directly-driven permanent magnet synchronous generators (D-PMSG)-based wind turbine (WT) usually uses conventional PD control to support frequency, however, the related controller ...
Hongqing Liu +3 more
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A Cell-Based Wide-Frequency-Range DLL Supporting Fast Frequency Scaling
2019 17th IEEE International New Circuits and Systems Conference (NEWCAS), 2019In this paper, we present a cell-based wide-frequency-range DLL supporting clock frequencies from 10MHz to 1GHz in 90nm. To support fast locking (during frequency scaling), we present novel architecture with a socalled “fast-locking mode” - in which the control code for the Long-Range Delay Block (LRDB) can be quickly determined in a way that the ...
Wei Chu, Shi-Yu Huang
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Aggregation Frequency Response Modeling for Wind Farms with Frequency Support Capabilities
2019 IEEE Power & Energy Society General Meeting (PESGM), 2019The high penetration wind power will count towards a significant portion of future power grid. This significant role requires wind turbine generator (WTG) to contribute to primary frequency regulation support. Consequently, it is necessary to investigate the dynamic frequency response of wind farms. In this paper, an aggregated frequency response model
Jianfeng Dai, Yi Tang, Yurong Wang
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Seismic Support: Speedy Determination of Frequency
Journal of the Structural Division, 1979Seismic restraints are provided to support safety-related electrical cable trays or conduits and HVAC ductwork in nuclear power plant structures. It is shown that most of these restraints, in the form of frames, can be represented by single-degree-of-freedom models for analysis and design. Approximate formulas, based on the stiffness of the SDOF models,
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Care of the Child Supported on High Frequency Oscillatory Ventilation
AACN Clinical Issues: Advanced Practice in Acute and Critical Care, 1994High frequency oscillatory ventilation is a new mode of ventilatory support of acute respiratory failure in the pediatric population. Delineating the nursing care required of this fragile group of infants and children is challenging, because there is a paucity of published data and national clinical experience. The author reviews a management plan that
M A, Curley, J, Molengraft
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Oscillatory support for rapid frequency change processing in infants
Neuropsychologia, 2013Rapid auditory processing and auditory change detection abilities are crucial aspects of speech and language development, particularly in the first year of life. Animal models and adult studies suggest that oscillatory synchrony, and in particular low-frequency oscillations play key roles in this process.
Gabriella, Musacchia +5 more
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