Results 61 to 70 of about 26,369 (176)

Nadir Echo Removal in Synthetic Aperture Radar via Waveform Diversity and Dual-Focus Postprocessing [PDF]

, 2018
Synthetic aperture radar (SAR) remote sensing allows high-resolution imaging independent of weather conditions and sunlight illumination and is, therefore, very attractive for the systematic observation of dynamic processes on the earth's surface ...
Villano, Michelangelo, Alberto Moreira, Moreira, Alberto, Krieger, Gerhard, Michelangelo Villano, Gerhard Krieger   +5 more
core   +1 more source

Fast frequency response requirements for replacement of observed generator response during under frequency transients [PDF]

, 2017
The aim of this investigation is to set requirements for optimal participation of battery energy storage systems in ancillary services. In this case the target is to maintain or improve the frequency nadir following loss of generation events.
Best, Robert, Kubik, Marek L., Brogan, Paul, Alikhanzadeh, A.H., Morrow, D John; id_orcid   +4 more
core   +2 more sources

A Unified Analytical Method to Quantify Three Types of Fast Frequency Response from Inverter-based Resources [PDF]

, 2023
With more inverter-based resources (IBRs), our power systems have lower frequency nadirs following N-1 contingencies, and undesired under-frequency load shedding (UFLS) can occur.
Fang, Xin, Cui, Xiaofan, Tan, Jin, Gao, Ningchao, Hoke, Anderson, Dong, Shuan   +5 more
core   +1 more source

Toward seasonal internal tides harmonic analysis from nadir altimetry [PDF]

, 2022
International audienceThe internal tides (ITs) are present in all ocean bassin but, as high frequency processes, they will not be resolved by the forthcoming SWOT mission.
Lyard, Florent, H, Carrère, Loren, Dabat, Mei Ling, Allain, Damien, Barbot, Simon   +4 more
core  

Nodal frequency-constrained energy storage planning via hybrid data-model driven methods

iEnergy
Cross-regional high voltage direct current (HVDC) systems bring remarkable renewable power injections to the receiver side of power grids. However, HVDC failures result in large disturbances to receivers and cause critical frequency security problems ...
Jiaxin Wang, Jiawei Zhang, Min Yang, Yating Wang, Ning Zhang   +4 more
doaj   +1 more source

A TerraSAR-X Experiment for Validation of Nadir Echo Suppression through Waveform Encoding and Dual-Focus Post-Processing [PDF]

, 2021
Synthetic aperture radar (SAR) is a powerful remote sensing technique providing high-resolution images of Earth’s sur-face. The pulsed operation of SAR may cause nadir echoes in SAR images which significantly affect the image quality.
Steinbrecher, Ulrich, Villano, Michelangelo, Jeon, Se-Yeon, Kraus, Thomas, Krieger, Gerhard   +4 more
core  

Analytical Frequency Security Indicators for Two-Region Interconnected Power Systems

IEEE Access
Frequency spatial distribution characteristics of interconnected power systems are highlighted, resulting in significant regional frequency differences and inter-region tie-line power fluctuations, posing a threat to frequency security operation. For two-
Qiang Zhang, Xinwei Li, Guorong Lan, Xiangxu Wang, Jiakai Shen, Hui Zeng, Peng Yuan, Xiaoheng Zhang, Weidong Li   +8 more
doaj   +1 more source

EM models for evaluating rain perturbation on the NRCS of the sea surface observed near nadir [PDF]

, 1998
The authors address the problem of evaluating the normalised radar cross section (NRCS) of the sea surface perturbed by the joint effect of rain and wind, when observed close to nadir.
Capolino, F, Facheris, L, Giuli, D, Sottili, F   +3 more
core   +1 more source

Data-driven continuous-time framework for frequency-constrained unit commitment [PDF]

The conventional approach to solving the unit commitment problem involves discrete intervals at an hourly scale, particularly when integrating frequency dynamics to formulate a frequency-constrained unit commitment.
L Sigrist (22088948), M Rajabdorri (22088945), E Lobato (13318470), Jamshid Aghaei (16929249)   +3 more
core   +3 more sources

Torque Limit-based Inertial Control Method Based on Delayed Support for Primary Frequency Control of Wind Turbines

Journal of Modern Power Systems and Clean Energy
To avoid the secondary frequency dip caused by the steep drop of the electrical power of wind turbines (WTs) at the end of frequency support stage, the torque limit-based iner-tial control (TLIC) method sets the power reference as a linear function of ...
Wei Gu, Zaiyu Chen, Qun Li, Minghui Yin, Qiang Li, Yun Zou   +5 more
doaj   +1 more source