Results 21 to 30 of about 798,059 (294)

Transient characteristics and adaptive fault ride through control strategy of DFIGs considering voltage phase angle jump

Journal of Modern Power Systems and Clean Energy, 2017
Wind power in China has experienced fast development in recent years. However, areas rich in wind power resources are often far away from loads centers, which leads to weak connection between wind turbines and power grid.
Xinshou Tian, Yongning Chi, Weisheng Wang, Gengyin Li, Haiyan Tang, Zhen Wang   +5 more
doaj   +1 more source

Frequency regulation optimization strategy of improved virtual synchronous generator under ultra-weak grid conditions [PDF]

AIP Advances
To enhance the frequency support capability of grid-forming energy storage systems governed by Virtual Synchronous Generators (VSGs) under ultra-weak grid conditions, an improved VSG frequency support strategy is proposed based on model predictive ...
Xucun Guo, Yongfeng Ren, Rong Zhu, Bin He, Chenzhi Fang, Ruijie Xu   +5 more
doaj   +1 more source

A multi-block infrastructure for three-dimensional time-dependent numerical relativity [PDF]

, 2006
We describe a generic infrastructure for time evolution simulations in numerical relativity using multiple grid patches. After a motivation of this approach, we discuss the relative advantages of global and patch-local tensor bases.
Diener, Peter, Dorband, Ernst Nils, Schnetter, Erik, Tiglio, Manuel   +3 more
core   +3 more sources

Modeling and Control Parameters Design for Grid-Connected Inverter System Considering the Effect of PLL and Grid Impedance

IEEE Access, 2020
Small-signal stability problems often occur when the inverter for renewable energy generation is connected to weak grid. A small-signal transfer function integrated model reflecting the interaction of grid impedance, phase locked-loop (PLL), and current ...
Zhiwei Xie, Yandong Chen, Wenhua Wu, Yuancan Xu, Haining Wang, Jian Guo, An Luo   +6 more
doaj   +1 more source

A Bare Molecular Cloud at z~0.45 [PDF]

, 2010
Several neutral species (MgI, SiI, CaI, FeI) have been detected in a weak MgII absorption line system (W_r(2796)~0.15 Angstroms) at z~0.45 along the sightline toward HE0001-2340.
Andrew C. Mshar, Bentz, Bowen, Churchill, Churchill, Churchill, Churchill, Churchill, Churchill, Ding, Fujita, Ganguly, Gary J. Ferland, Glover, Haardt, Heckman, Heithausen, Jane C. Charlton, Kacprzak, Keeney, Kobayashi, Le Brun, Leroy, Lynch, Lynch, Milutinović, Misawa, Narayanan, Narayanan, Nestor, Pfenniger, Pfenniger, Rao, Rao, Rao, Reimers, Richter, Richter, Richter, Rigby, Rupke, Schwartz, Sembach, Stocke, Therese M. Jones, Toru Misawa, Tytler, Wakker, Welty, Zonak   +49 more
core   +5 more sources

Likelihood based inference for current status data on a grid: A boundary phenomenon and an adaptive inference procedure [PDF]

, 2011
In this paper, we study the nonparametric maximum likelihood estimator for an event time distribution function at a point in the current status model with observation times supported on a grid of potentially unknown sparsity and with multiple subjects ...
Banerjee, Moulinath, Kosorok, Michael R., Tang, Runlong   +2 more
core   +3 more sources

Improved Fractional-order Damping Method for Voltage-controlled DFIG System Under Weak Grid

Journal of Modern Power Systems and Clean Energy, 2022
When a doubly-fed induction generator (DFIG) is connected to a weak grid, the coupling between the grid and the DFIG itself will increase, which will cause stability problems. It is difficult to maintain the tracking accuracy and ro-bustness of the phase-
Zhen Xie, Xiang Gao, Shuying Yang, Xing Zhang   +3 more
doaj   +1 more source

Hybrid finite difference/finite element immersed boundary method [PDF]

, 2017
The immersed boundary method is an approach to fluid-structure interaction that uses a Lagrangian description of the structural deformations, stresses, and forces along with an Eulerian description of the momentum, viscosity, and incompressibility of ...
Griffith, Boyce E., Luo, Xiaoyu
core   +3 more sources

Robust Delay Compensation Strategy for LCL-Type Grid-Connected Inverter in Weak Grid

IEEE Access, 2022
Capacitor-current-feedback active damping has been widely adopted in digitally controlled LCL-type grid-connected inverters (GCIs). However, their digital control delay causes the system stability to deteriorate within a negative damping range ...
Xin Ding, Ruinan Xue, Tianzhi Zheng, Fannie Kong, Yanming Chen   +4 more
doaj   +1 more source

Comprehensive modeling of grid-connected inverters in weak grid systems

Electrical engineering & Electromechanics
Introduction. The stability of grid-connected inverters is critical for the integration of renewable energy into modern power systems. However, this stability is significantly challenged under weak grid conditions, characterized by high impedance and low
Y. Daili, R. Bentafer, N. Djaraf, A. Harrag   +3 more
doaj   +1 more source