Results 91 to 100 of about 142,195 (311)

Comparison between two VSC-HVDC transmission systems technologies : modular and neutral point clamped multilevel converter [PDF]

, 2009
The paper presents a detail comparison between two voltage source converter high voltage dc transmission systems, the first is based on neutral point-clamped (also known as HVDC-Light) and the second is based on innovative modular multilevel converter ...
Adam, G.P., Anaya-Lara, O., Burt, G.M., Finney, S.J., McDonald, J.R., Williams, B.W.   +5 more
core  

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer [PDF]

, 2014
A variable frequency transformer (VFT) is being considered as a new alternative to the classical back-to-back high voltage direct current (HVDC) link for interconnection of two asynchronous networks. The VFT is a retrospective form of frequency converter
Ambati, Bharath Babu, El Moursi, Mohamed, Kanjiya, Parag, Khadkikar, Vinod, Kirtley Jr, James L   +4 more
core   +1 more source

Balancing act: An autoethnographic study of one medical educator's first year as a mentor

Anatomical Sciences Education, EarlyView.
Abstract Novice faculty mentors often struggle with the transition from mentee to mentor. Although they may face similar challenges, each mentor's experience and journey of professional identity formation is unique, influenced by their background, experiences, relationships, and context.
Andrew S. Cale
wiley   +1 more source

Comprehensive fault ride‐through scheme for doubly‐fed induction generators

The Journal of Engineering, 2018
With the growth of wind energy penetration in electricity transmission grids, fault ride‐through (FRT) ability is required in order to maintain the uninterrupted operation of wind farm in voltage disturbance scenarios. For widespread used doubly‐fed induction generator FRT issues, an auxiliary hardware circuit is adopted in large‐grid‐voltage drop ...
Fan Cheng, Liangzhong Yao, Yan Li, Lijun Xie, Chunxia Wei   +4 more
openaire   +2 more sources

FAULT RIDE-THROUGH CAPABILITY AND DAMPING IMPROVEMENT IN DFIG [PDF]

, 2016
Doubly-fed induction generator wind turbine is susceptible to faults and requires crowbar protection. When the crowbar is triggered, the rotor is short circuited over the crowbar impedance.
Dolara, Alberto, G., Sava, Grimaccia, Francesco, Leva, Sonia, M. Q., Duong, Mussetta, Marco   +5 more
core  

Minimising the impact of disturbances in future highly-distributed power systems [PDF]

, 2017
It is expected that future power systems will require radical distributed control approaches to accommodate the significant expansion of renewable energy sources and other flexible grid devices.
Belloni, F.R., Blair, S.M., Burt, G.M., Hänninen, S., Kedra, B., Kosmecki, M., Lof, A., Lüers, B., Merino, J., Pala, D., Temiz, A., Valov, M.   +11 more
core   +1 more source

The rise of informed consent and retreat from dependence upon unclaimed bodies in anatomy: An overview and assessment

Anatomical Sciences Education, EarlyView.
Abstract The development of anatomy has been marked by ethically questionable practices. This has been because the dissection of human bodies has always existed on the periphery of conventional society, necessitating a range of dubious ways of obtaining dead bodies for educational and research purposes.
David Gareth Jones
wiley   +1 more source

DC fault isolation study of bidirectional dual active bridge DC/DC converter for DC transmission grid application [PDF]

, 2015
Fast isolation and detection of DC faults is currently a limiting factor in high power DC transmission grid development. Recent research has shown that the role of DC/DC converters is becoming increasingly important in solving various DC grid challenges ...
Aboushady, Ahmed A., Ahmed, Khaled H., Harrye, Yasen A.   +2 more
core   +2 more sources

Parental involvement and engagement during COVID‐19 lockdowns: School staff and parents' reflections about children's learning at home

British Educational Research Journal, EarlyView.
Abstract Valuing parental engagement, as part of home–school collaboration, can benefit children's learning. This article focuses on parents and school‐based staff's (N = 120) experiences of children's learning occurring at home during the COVID‐19 lockdowns (2020–2021), both school‐mandated and other learning activities.
Ashley Brett, Bonny L. Hartley, Deborah Wallace, Adewale Magaji, Lorraine Smith, Rachel Wolfendale   +5 more
wiley   +1 more source

A Black Box Doubly Fed Wind Turbine Electromechanical Transient Structured Model Fault Ride-Through Control Identification Method Based on Measured Data

Applied Sciences
With the increasing proportion of grid-connected capacity of new energy units, such as wind power and photovoltaics, accurately constructing simulation models of these units is of great significance to the study of new power systems.
Xu Zhang, Shenbing Ma, Jun Ye, Lintao Gao, Hui Huang, Qiman Xie, Liming Bo, Qun Wang   +7 more
doaj   +1 more source