Results 81 to 90 of about 142,131 (309)

Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems [PDF]

, 2015
Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses.
Morrow, D John, Xu, Lie, Yao, Liangzhong, Zeng, Rong   +3 more
core   +1 more source

Structural problems without structural solutions? Youth leaders' perceptions of their community

American Journal of Community Psychology, EarlyView.
Abstract As young people explore and reflect on the conditions of their neighborhoods and communities, they can forge a critical consciousness—merging their perspectives and analysis to direct both individual and collective actions. Photovoice is a methodological tool that allows participants to document their perspectives and analysis and discuss with
Linnea L. Hjelm, Aishia A. Brown, Benjamin W. Fisher, Alice Story, Nubia Bennett   +4 more
wiley   +1 more source

Dynamic active torque coordination strategy for torsional vibration suppression in wind turbines during grid fault recovery

International Journal of Electrical Power & Energy Systems
When the grid fault occurs, wind turbines are required to possess fault ride-through (FRT) capability and rapidly restore active power after fault clearance.
Cai Guang, Yan Xiangwu, Zhang Shurui, Ren Haoyang, Jia Jiaoxin, Zhou Fan   +5 more
doaj   +1 more source

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

IET Generation, Transmission & Distribution, 2022
This paper presents a control mechanism on high voltage direct current (HVDC) transmission line for frequency/voltage regulation, fault ride through (FRT) capability, and cyber‐attack/fault detection.
Reza Hemmati, Hossien Faraji
doaj   +1 more source

Enhanced independent pole control of hybrid MMC-HVDC system [PDF]

, 2018
This paper presents an enhanced independent pole control scheme for hybrid modular multilevel converter (MMC) based on full bridge sub-module (FBSM) and half bridge sub-module (HBSM). A detailed analysis of power distribution between upper and lower arms
Ling, Weixing, Wen, Jingyu, Xiang, Wang, Xu, Lie   +3 more
core   +1 more source

Neighborhood social environments and mental health among youth and adults in public housing

American Journal of Community Psychology, EarlyView.
Abstract Neighborhoods influence health in part through social processes. However, little is known about how multiple neighborhood social processes co‐occur, or about within (vs. between) neighborhood variation in social processes and health. This study asked how residents of a large public housing development describe their neighborhood and used ...
Jane Leer, Lindsay Lanteri, Rebekah Levine Coley, Samantha Teixeira   +3 more
wiley   +1 more source

Stability enhancement of a hybrid micro-grid system in grid fault condition [PDF]

, 2012
Low voltage ride through capability augmentation of a hybrid micro-grid system is presented in this paper which reflects enhanced reliability in the system. The control scheme involves parallel connected multiple ac-dc bidirectional converters.
15th International Conference on Electrical Machines and Systems, ICEMS 2012, Al-Durra, Ahmed, Ambia, Mir Nahidul, Caruana, Cedric, Muyeen, Syed M.   +4 more
core  

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

Understanding Youth Assaults of Police Officers in Australia: A Power Threat Meaning Framework Analysis

Australian Journal of Social Issues, EarlyView.
ABSTRACT This study explores youth violence towards police officers in Australia through the Power Threat Meaning Framework (PTMF) to better understand the underlying factors contributing to such violence; focusing on power dynamics, childhood adversity, and trauma.
Dimitra Lattas, Kelly Hine, Catherine Creamer, Kelley Burton, Katelyn Davenport‐Klunder   +4 more
wiley   +1 more source

A novel FRT strategy for transformerless MMC to improve current differential protection performance under single-phase grounding faults

International Journal of Electrical Power & Energy Systems
AC/DC distribution networks are interconnected by converters such as modular multilevel converters (MMCs). In AC/DC distribution networks, single-phase grounding (SPG) faults can cause enormous challenges in relay protection.
Yuze Li, Peng Guo, Qianming Xu, Josep M. Guerrero   +3 more
doaj   +1 more source