Results 31 to 40 of about 8,400 (267)

Fault Management in DC Microgrids: A Review of Challenges, Countermeasures, and Future Research Trends

IEEE Access, 2021
The significant benefits of DC microgrids have instigated extensive efforts to be an alternative network as compared to conventional AC power networks. Although their deployment is ever-growing, multiple challenges still occurred for the protection of DC
Zulfiqar Ali, Yacine Terriche, Le Quang Nhat Hoang, Syed Zagam Abbas, Mustafa Alrayah Hassan, Muhammad Sadiq, Chun-Lien Su, Josep M. Guerrero   +7 more
doaj   +1 more source

DC fault current clearance coordinated control strategy for DC grid with hybrid MMC

International Journal of Electrical Power & Energy Systems
For DC grid based on the hybrid modular multilevel converter (MMC), the traditional DC fault current clearance scheme takes a long time and greatly affects the active power transmission.
Shouqi Jiang, Tuo Wang, Guoqing Li, Yechun Xin, Lixin Wang   +4 more
doaj   +1 more source

A method for short-circuit fault current calculation in DC grids based on phase-mode transformation

电力工程技术
Accurate short-circuit fault current calculation is important for device selection, parameter design and protection research of flexible DC grid. To solve the problem that existing fault current calculation methods do not consider the pole-to-pole ...
WANG Taiji, ZHANG Kun, XU Zhuang, GUO Yanxun   +3 more
doaj   +1 more source

Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters

电力工程技术, 2022
The fault characteristics of direct current (DC) grids can be analyzed by addressing the grid damping characteristics. However,the frequency-dependent characteristics of the transmission line parameters are usually ignored in the conventional grid ...
CHEN Siwei, LI Baohong, LIU Tianqi, HE Chuan, ZHANG Min, WANG Tengxin   +5 more
doaj   +1 more source

Protection and post-fault recovery of large HVDC networks using partitioning and fast-acting DC breakers at strategic locations

The Journal of Engineering, 2019
DC fault protection arrangements for a large multi-terminal HVDC (MTDC) network are proposed where fast-acting DC circuit breakers are only used at strategic locations with the large DC network to be operated interconnected but partitioned into islanded ...
Md Habibur Rahman, Rui Li, Rui Li, Liangzhong Yao, Lie Xu   +4 more
doaj   +1 more source

Incipient fault diagnosis method for DC–DC converters based on sensitive fault features

IET Power Electronics, 2020
DC–DC converters play an important role in electrical systems. The fault state of a DC–DC converter has a major impact on the operation of the back‐end components and the entire electrical system. Therefore, the fault diagnosis is very necessary when the fault state of DC–DC is in the early stage. It can decrease the likelihood of happening the serious
Yang Yu, Yueming Jiang, Yanlong Liu, Xiyuan Peng   +3 more
openaire   +1 more source

Phase Angle as an Early Functional Biomarker of Cancer‐Related Fatigue in Pediatric Oncology: A Prospective Longitudinal Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Pediatric cancer remains a leading cause of morbidity and mortality worldwide, particularly in low‐and middle‐income countries. Cancer treatment may impair nutritional status, alter body composition, and exacerbate cancer‐related fatigue (CRF).
Luís Carlos Lopes‐Junior, Luiz Claudio Barreto Silva Neto, Fabiano Kenji Haraguchi, Letícia Batista de Azevedo, Marcelo Brenner Nascimento Carlini, Raphael Manhães Pessanha, Mariana Rabello Laignier, Wesley Rocha Grippa, Tania Mara Lopes Bitti Bortolini, Gláucia Zouain‐Figueiredo, Regina Aparecida Garcia de Lima, Liliana Vasquez   +11 more
wiley   +1 more source

Submodule configuration of HVDC‐DC autotransformer considering DC fault [PDF]

IET Power Electronics, 2016
This paper studies the submodule configuration of modular multilevel converter (MMC) based non‐isolated HVDC‐DC autotransformer (HVDC‐AT) with DC fault blocking capability, including two‐terminal and multi‐terminal topologies. The operation principle of the HVDC‐AT is described.
Suo, Zhiwen, Li, Gengyin, Li, Rui, Xu, Lie, Wang, Weisheng, Chi, Yongning, Sun, Wei   +6 more
openaire   +2 more sources

On Hierarchical Composite Endpoints in Pediatric Cancer Supportive Care: Illustrative Examples From Two Multi‐Center Phase‐III Randomized Clinical Trials

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Pediatric supportive care clinical trials often involve multiple clinically important outcomes, complicating trial interpretation. Hierarchical composite endpoints (HCEs) provide a framework to integrate key outcomes according to clinical importance.
Willem H. Collier, Mark Zobeck, Adam J. Esbenshade, Christopher C. Dvorak, Lillian Sung, David Freyer, Sarah Alexander, Etan Orgel, Nicole J. Ullrich, Zach Prudowsky, Brian Fisher, Caitlin W. Elgarten   +11 more
wiley   +1 more source

Coordinated Control Strategy of DC Fault Ride-through for the WF Connected to the Grid Through the MMC-HVDC

Frontiers in Energy Research, 2021
Aiming at the problems of DC fault isolation and power surplus in the HVDC system with large-scale wind farm (WF) integration after single-pole grounding fault, this article designs a modified current transfer modular multilevel converter (M-CT-MMC ...
Bo Zhu, Hongying Li, Panteng Xu, Shi Jiao, Lin Zhang, Yechun Xin   +5 more
doaj   +1 more source