Results 31 to 40 of about 233 (207)

New grid impedance estimation technique for grid-connected power converters

Journal of Engineering Research, 2014
Grid impedance estimation is crucial for operating and controlling of grid-connectedconverters, especially with the high penetration of renewable energy sources into microgridand smart grid. One of the technical challenges is how to fast and accurately estimate the gridimpedance, even under the distorted and unbalanced conditions.
Xiaoqiang Guo, Zhigang Lu, Xiaofeng Sun, Herong Gu, Weiyang Wu   +4 more
openaire   +1 more source

Real-Time Impedance Estimation for Power Line Communication

IEEE Access, 2019
The real-time broadband properties of impedance in power line communication (PLC) systems are one of the essential characteristics of future smart grids, which would enable the smart online systems to implement fault detection/forecast or the PLC channel
Dong Liang, Huashan Guo, Tao Zheng
doaj   +1 more source

Grid voltage control with wind turbine inverters by using grid impedance estimation [PDF]

3rd Renewable Power Generation Conference (RPG 2014), 2014
Currently, distributed generation (DG) units usually do not participate in the primary grid voltage control and inject power regardless. Only when the grid voltage level surpasses a certain threshold, these units shut down to avoid any overvoltage problems. In this paper, a method is developed to control the grid voltage by wind turbines. This way, the
De Kooning, Jonas, Van de Vyver, Jan, De Kooning, Jeroen, Vandoorn, Tine, Vandevelde, Lieven   +4 more
openaire   +2 more sources

Gauss-Newton Method Applied to Impedance Estimation in Grid-Connected Inverters

Eletrônica de Potência
This work presents a methodology that employs the Gauss–Newton algorithm to perform online impedance estimation for grid-connected inverters. Conventional formulations for this class of problem typically lead to high-order nonlinear systems of equations,
Jefferson R. P. de Assis, Darlan A. Fernandes , Maurício B. de R. Corrêa, Alfeu J. Sguarezi Filho, Fabiano F. Costa, Edison R. C. da Silva   +5 more
doaj   +1 more source

Waveform Variation Defined Model for Harmonic Current Emissions Including Cross-Order Supply Voltage Harmonics Influence

IEEE Access, 2023
The paper reports an experimental non-linear load evaluation regarding current harmonics sensitivity to supply voltage harmonics. A base for the model is proposed relying on the time-domain waveform variations, rather than impedance or conductance ...
Kamran Daniel, Lauri Kutt, Muhammad Naveed Iqbal, Noman Shabbir, Martin Parker, Marek Jarkovoi   +5 more
doaj   +1 more source

Iterative Methods for Nonlinear Systems Applied to Grid Impedance Estimation: A Comparative Study

Eletrônica de Potência
In this work, a comparative study is presented to evaluate the performance of iterative methods to solve nonlinear systems applied to grid impedance estimation.
Jefferson R. P. de Assis, Andréia da S. Gomes, Hugo M. T. C. Gomes, Fabiano F. Costa, Wellington F. Felipe, Maurício B. de R. Corrêa, Darlan A. Fernandes   +6 more
doaj   +1 more source

Power Distribution System Characterization With Active Probing: Real-World Testing and Analysis

IEEE Open Access Journal of Power and Energy, 2023
Power distribution systems are traditionally characterized using passive means such as parameter estimation and topology identification. This work investigates an active way to test and characterize dynamically changing distribution systems.
Can Huang, Hannah Burroughs, Cecilia Klauber, Chih-Che Sun   +3 more
doaj   +1 more source

Evaluating the effect of γ‐oryzanol on MASLD pathology using a medaka fish model

FEBS Open Bio, EarlyView.
This study explores a liver disease called MASLD, which is increasing worldwide and can lead to serious damage. Researchers used medaka fish instead of rodents to test a food compound, γ‐oryzanol. Fish fed this compound had less liver fat and healthier gut bacteria.
Yukako Ito, Haduki Asano, Ayano Ueki, Joe Sakamoto, Yasuhiro Kamei, Hayato Tokumoto, Ayaka Yazawa, Shigeki Kamitani   +7 more
wiley   +1 more source

Small-signal Stability Analysis and Improvement with Phase-shift Phase-locked Loop Based on Back Electromotive Force Observer for VSC-HVDC in Weak Grids

Journal of Modern Power Systems and Clean Energy, 2023
Voltage source converter based high-voltage direct current (VSC-HVDC) transmission technology has been extensively employed in power systems with a high penetration of renewable energy resources. However, connecting a voltage source converter (VSC) to an
Yongqing Meng, Haibo Wang, Ziyue Duan, Feng Jia, Zhengchun Du, Xiuli Wang   +5 more
doaj   +1 more source

GelMA‐based 3D spheroids recapitulate transcriptomic and functional hallmarks of myeloid sarcoma

FEBS Open Bio, EarlyView.
GelMA 5% hydrogels support the formation of myeloid leukemia spheroids that recapitulate MS‐specific features, including G1 arrest, apoptosis, and ECM‐driven transcriptomic reprogramming. The 3D model mimicked soft‐tissue‐like stiffness and oxygen conditions, and transcriptomic convergence with primary MS samples confirmed its utility as a preclinical ...
Nicolas Germain, Elise Buret, Le Hoang Thanh Nguyen, Marion Cocheteux, Nicolas Touya, Mélanie Dhayer, Romain Dubois, Frank Lafont, Sebastien Janel, Patrice Maboudou, Steve Lancel, Philippe Marchetti   +11 more
wiley   +1 more source