Results 21 to 30 of about 2,400,130 (293)

Detection of Internal Faults in Transformers By Negative Sequence Current

SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology, 2013
Initially it is very difficult to find out internal fault in transformer. These internal fault are hazardous and causes overheating of transformer oil and winding, it consequences as insulation failure because of this uninterrupted power supply cannot be continued. It is more difficult to detect internal fault in small ratting transformer.
Satyam Prakash, Vivek Mishra
openaire   +1 more source

Turn-to-Turn Fault Diagnosis on Three-Phase Power Transformer Using Hybrid Detection Algorithm

Applied Sciences, 2021
A power transformer (PT) in power generation or transmission is critical to maintaining electrical continuity. Fault detection on a PT is needed, especially of incipient faults, which are often caused by a turn-to-turn fault (TTF) before it develops into
Chien-Hsun Liu, Willybrordus H. P. Muda, Cheng-Chien Kuo   +2 more
doaj   +1 more source

Investigation of negative sequence injection capability in H-bridge multilevel STATCOM [PDF]

, 2014
The aim of this paper is to investigate the ability of star- and delta-connected H-bridge multilevel STATCOMs to exchange negative-sequence current with the grid. Zero-sequence injection is utilized for capacitor voltage balancing.
Behrouzian, Ehsan, Bongiorno, Massimo, Zelaya, Hector   +2 more
core   +1 more source

MMC-SST input-level control strategy considering power quality optimization

电力工程技术, 2022
The surge of negative sequence component of current affects the waveform quality of grid side current and endangers the normal operation of the system when the three-phase voltage of solid state transformer (SST) in the distribution network is unbalanced
ZHAO Wei, YUAN Zhi, WANG Weiqing, HE Shan   +3 more
doaj   +1 more source

Synchronous power control of grid-connected power converters under asymmetrical grid fault [PDF]

, 2017
Control of grid-connected power converters is continuously developing to meet the grid codes, according to which the generation units should keep connected to the grid and further provide ancillary services, such as voltage and frequency support ...
Candela García, José Ignacio, Rocabert Delgado, Joan, Rodríguez Cortés, Pedro, Zhang, Weiyi   +3 more
core   +2 more sources

Negative sequence current accumulation difference based wind farm collection line protection for MMC-HVDC system

Energy Reports, 2023
During the fault of the wind power collection line of the MMC-HVDC system, the amplitude of the fault current may be limited due to the control of the converter, which leads to the severe limitation of traditional protection.
Peng Sun, Yifan Li, Lanlan Qu, Jitong Gong, Hui Li, Shaofeng Huang   +5 more
doaj   +1 more source

A computationally efficient current controller for simultaneous injection of both positive and negative sequences [PDF]

2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe), 2017
This work was supported by the Research Promotion Foundation (RPF, Cyprus, Project KOINA/SOLAR-ERA.NET/1215/06), by the Ministry of National Infrastructure Energy and Water (Israel) and the SOLAR-ERA.NET (European Union's Seventh Framework Programme). © 2017 IEEE. Personal use of this material is permitted.
Ali, Zunaib, Christofides, Nicholas, Hadjidemetriou, Lenos, Kyriakides, Elias   +3 more
openaire   +1 more source

Improved protection system for phase faults on marine vessels based on ratio between negative-sequence and positive-sequence of the fault current [PDF]

, 2018
This paper presents a new method to protect the radial feeders on marine vessels. The proposed protection method is effective against Phase-Phase (PP) faults and is based on evaluation of the ratio between the negative-sequence and positive-sequence of ...
Bak, Claus, Blaabjerg, Frede, Booth, Campbell, Ciontea, Catalin, Hong, Qiteng, Madsen, Kjeld, Sterregaard, Claes   +6 more
core   +3 more sources

Conditioned emergence: a dissipative structures approach to transformation [PDF]

, 1999
This paper presents a novel framework for the management of organisational transformation, defined here as a relatively rapid transition from one archetype to another.
Aaker, Ancona, Armstrong, Bagozzi, Bagozzi, Bourgeois, Bourgeois, Bourgeois, Bourgeois, Burns, Child, Cronbach, Dess, Dess, Dess, Dess, Dess, Doty, Duncan, Enz, Finkelstein, Floyd, Fornell, Galbraith, Ginsberg, Gladstein, Govindarajan, Griffin, Grinyer, Hambrick, Hambrick, Hart, Hax, Hinings, Hrebiniak, Iaquinto, Irving, Jehn, Katz, Kim, Lawrence, Li, Miles, Miller, Miller, Miller, Milliken, Naman, Nunnally, Pelled, Porter, Porter, Porter, Priem, Ruekert, Ruekert, Rumelt, Schoonhoven, Schweiger, Sharma, Skivington, Song, Stagner, Thompson, Tjosvold, Tushman, Venkatraman, Venkatraman, Walker, West, Whitney, Wooldridge, Zajac   +72 more
core   +1 more source

Coordinated Control of DFIG Converters to Comply with Reactive Current Requirements in Emerging Grid Codes

Journal of Modern Power Systems and Clean Energy, 2022
The doubly-fed induction generator (DFIG) is considered to provide a low-reactance path in the negative-sequence system and naturally comply with requirements on the negative-sequence reactive current in emerging grid codes.
Yuanzhu Chang, Ilhan Kocar, Jiabing Hu, Ulas Karaagac, Ka Wing Chan, Jean Mahseredjian   +5 more
doaj   +1 more source