Results 61 to 70 of about 441,873 (190)

Time- and spatially-resolved magnetization dynamics driven by spin-orbit torques

, 2017
Current-induced spin-orbit torques (SOTs) represent one of the most effective ways to manipulate the magnetization in spintronic devices. The orthogonal torque-magnetization geometry, the strong damping, and the large domain wall velocities inherent to ...
Acremann, Yves, Avci, Can Onur, Baumgartner, Manuel, Feng, Junxiao, Finizio, Simone, Gabureac, Mihai, Gambardella, Pietro, Garello, Kevin, Grimaldi, Eva, Mendil, Johannes, Murer, Christoph, Raabe, Jörg, Stamm, Christian, Wintz, Sebastian   +13 more
core   +1 more source

Towards automated design of quantum cascade lasers [PDF]

, 2005
We present an advanced technique for the design and optimization of GaAs/AlGaAs quantum cascade laser structures. It is based on the implementation of the simulated annealing algorithm with the purpose of determining a set of design parameters that ...
Aleksandra Mirčetić, Dragan Indjin, Ortiz V., Paul Harrison, Radovanović J., Robert W. Kelsall, Sirtori C., Vitomir Milanović, Zoran Ikonić   +8 more
core   +1 more source

An Application of a Dual-Module VSG Based on QPR and Virtual Impedance in Three-Phase Unbalanced Power Grids

Energies
As an innovative solution, the virtual synchronous generator (VSG) facilitates the seamless incorporation of renewable energy into power grids. It also exhibits the ability to reconfigure system inertia and deliver damping effects, thereby assuming a ...
Liping Fan, Mingjun Wang
doaj   +1 more source

Research on the Control Strategy of Star Cascaded SVG underThree-phase Unbalanced Conditions

Kongzhi Yu Xinxi Jishu, 2021
Star cascaded static var compensator (SVG) does not regulate power among phases under the condition of unbalanced voltage. It will cause serious imbalance of three-phase DC voltages, and made device withdraw from operation because of over-voltage or ...
WU Bing, HU Xiaodong, LI Sufen, ZHANG Dinghua, WANG Feng, XU Yong   +5 more
doaj  

Dynamic Voltage Support of Converters during Grid Faults in Accordance with National Grid Code Requirements

Energies, 2020
To ensure system stability, national grid codes often require converter-based generators to provide fault-ride-through (FRT) capabilities and dynamic voltage support, according to which they should stay connected and support the voltage during fault ...
Jürgen Marchgraber, Wolfgang Gawlik
doaj   +1 more source

A study on the negative sequence current injection during LVRT of IBRs

RE&PQJ
Low Voltage Ride Through (LVRT) behaviour of Inverter Based Resources (IBR) during asymmetrical grid faults is dictated by the requirements of Grid Code (GC) at the Point of Common Coupling (PCC) of the renewable energy plants. Earlier GCs demanded only positive sequence current injection, which gave freedom to inverter manufacturers to implement ...
null A. Blázquez, null M. Larruskain, null E. Torres, null P. Eguia, null A. Castañon, null R. Cimadevilla   +5 more
openaire   +1 more source

Fault location in the observation matrix of collection lines for grid-connected wind power supported by grid-forming energy storage

International Journal of Electrical Power & Energy Systems
Aiming at the problem that the accuracy of fault location in the collection line supported by energy storage for wind power grid connection is easily affected by the number of measurement points and the access of power electronic equipment, a fault ...
Hongchun Shu, Bowen Wang, Jun Dong, Yutao Tang   +3 more
doaj   +1 more source

Estimation and Application for Line Impedance Between IBR and POM

Energies
With the increasing integration of Inverter-Based Resources (IBRs) into power grids, accurate estimation of line impedance between the Point of Connection (POC) and the Point of Measurement (POM) has become critical to ensure stable and efficient ...
Woo-Hyun Kim, Ye-Chan Kim, Seung-Ho Song
doaj   +1 more source

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

Energies, 2019
Islanding detection methods, based on injecting high-/low-frequency currents or negative sequence fundamental frequency currents and observing the resultant responses, are collectively referred to as irregular current injection methods in this paper.
Menghua Liu, Wei Zhao, Qing Wang, Songling Huang, Kunpeng Shi   +4 more
doaj   +1 more source

Hybrid‐Frequency Power Loop to Eliminate Negative‐Sequence Current for Star‐Connected Cascaded H‐Bridge STATCOM

IET Power Electronics
Since the power grid frequently experiences asymmetric operation caused by the unbalanced power load, the current compensation for the negative‐sequence component is typically required to control the star‐connected cascaded H‐bridge STATCOM. However, the
Zhendong Ji, Kangli Liu, Wei Liu, Yichao Sun, Dongye Li, Jianhua Wang, Xiaodan Wu, Jianfeng Zhao   +7 more
doaj   +1 more source