Results 61 to 70 of about 5,845,695 (202)

Coordinated frequency support strategy for VSC-HVDC integrated offshore wind farm system

Frontiers in Energy Research
The large-scale offshore wind power integrated into the onshore power grid through voltage source converter-based high voltage direct current (VSC-HVDC) system is unable to provide inertia response and frequency support to the onshore power grid.
He Li, Yuekai Li, Yao Meng, Kefei Yan
doaj   +1 more source

Negative Refraction and Subwavelength Lensing in a Polaritonic Crystal

, 2004
We show that a two-dimensional polaritonic crystal, made of metallic rods that support well defined plasmon oscillations, can act in a narrow frequency range as a medium in which a negative refraction and subwavelength lensing can occur.
A. Taflove, K. Kempa, X. Wang
core   +1 more source

A rotational speed recovery strategy for wind turbines considering secondary frequency drops

Zhejiang dianli
Wind turbines can contribute to frequency regulation by releasing rotor kinetic energy， which is an effective way to ensure frequency stability in power systems with high wind power penetration.
LYU Zhenhua, LI Yaran, ZHENG Mingzhong, LI Qiang, HU Yingjie   +4 more
doaj   +1 more source

The time derivative of the kilohertz quasi-periodic oscillations in 4U 1636-53 [PDF]

, 2012
We analysed all archival RXTE observations of the neutron-star low-mass X-ray binary 4U 1636-53 up to May 2010. In 528 out of 1280 observations we detected kilohertz quasi-periodic oscillations (kHz QPOs), with ~ 65% of these detections corresponding to ...
Abramowicz, Altamirano, Andrea Sanna, Barret, Barret, Barret, Barret, Barret, Belloni, Belloni, Belloni, Berger, Bradt, Di, Di, Diego Altamirano, Ford, Homan, Jahoda, Jonker, Kuulkers, Mariano Méndez, Miller, Méndez, Méndez, Méndez, Méndez, Osherovich, Press, Sanna, Savitzky, Shakura, Stella, Strohmayer, Tomaso Belloni, van der Klis, van der Klis, van der Klis, van der Klis, van Paradijs, van Straaten, van Straaten, van Straaten, Vaughan, Yu, Zhang   +45 more
core   +3 more sources

Cooperative control of virtual energy storage devices for energy regulation and rapid frequency support

Frontiers in Energy Research
Various controllable resources contribute to energy regulation and rapid support in the form of virtual energy storage (VES), which can significantly simplify control parameters and facilitate the evaluation of a microgrid’s economic and secure ...
Zheng Yang, Zheng Yang, Yi Wang, Jiahui Wei, Yabo Cao   +4 more
doaj   +1 more source

Multi-Terminal Coordinated Frequency Support Strategy for Alternating Current/Direct Current Hybrid Voltage Source Converter-Based Multi-Terminal Direct Current System

IEEE Access
The VSC-MTDC system incorporating hybrid AC/DC interconnections exhibits characteristics distinct from those of a purely DC-connected system during the process of grid frequency regulation.
Xilin Zhao, Maoyuan Du
doaj   +1 more source

EC-GSM-IoT Network Synchronization with Support for Large Frequency Offsets

, 2018
EDGE-based EC-GSM-IoT is a promising candidate for the billion-device cellular IoT (cIoT), providing similar coverage and battery life as NB-IoT. The goal of 20 dB coverage extension compared to EDGE poses significant challenges for the initial network ...
Huang, Qiuting, Korb, Matthias, Lippuner, Stefan, Salomon, Mauro, Weber, Benjamin   +4 more
core   +1 more source

A Model-Based Frequency Constraint for Mining Associations from Transaction Data

, 2006
Mining frequent itemsets is a popular method for finding associated items in databases. For this method, support, the co-occurrence frequency of the items which form an association, is used as the primary indicator of the associations's significance.
Hahsler, Michael
core   +3 more sources

Fast Frequency Support From Wind Turbine Systems by Arresting Frequency Nadir Close to Settling Frequency

IEEE Open Access Journal of Power and Energy, 2020
The recent power cut incident in the UK on 9th August 2019 indicated that frequency control to raise frequency nadir and eliminate frequency second dip is highly desirable for power grids with high penetration of wind energy.
Xianxian Zhao, Ying Xue, Xiao-Ping Zhang
doaj   +1 more source

Dyskalemia : frequency, prognosis, support and iatrogenesisDyskalemia : frequency, prognosis, support and iatrogenesis

, 2020
Contexte. Les troubles du potassium sont fréquents et associés à une augmentation de la mortalité toutes causes confondues, prenant la forme d’une courbe en U. Néanmoins, il existe peu de données sur les dyskaliémies en service d’urgence, en particulier chez des patients non critiques, alors qu’ils représentent une part importante de l’activité des ...
openaire   +1 more source