Results 41 to 50 of about 2,383,589 (201)

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

Optimal negative sequence current suppression strategy without phase‐locked loop based on the control of clustered new energy power stations

IET Generation, Transmission & Distribution, 2023
In the context of extremely uneven sources and loads in China, several large‐scale power transmission systems have been established. Affected by the small equivalent impedance of the system, the increase of negative sequence currents during open‐phase ...
Zhenxing Li, Yi Zhu, Cong Hu, Hong Tan, Hanli Weng, Zhenhua Li   +5 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

A Negative Sequence Impedance Design and Regulation Strategy for Negative Sequence Current Sharing Among Grid-Forming Sources in Microgrids Considering Topology Impacts

IEEE Open Journal of Power Electronics
The accurate control of negative sequence (NS) current distribution among multiple grid-forming (GFM) sources can lower the requirement on NS current capability of the sources.
Dingrui Li, Chengwen Zhang, Zhihao Jiang, Yu Su, Yiwei Ma, Fred Wang, Leon M. Tolbert   +6 more
doaj   +1 more source

Current decoupling control strategy for unbalanced input 3-1 matrix converter

工程科学学报, 2017
The reasons for low-order harmonics in the input current of a 3-1 matrix converter (3-1MC) were analyzed, and the relationship of modulation function between the output side and power compensation side was derived.
XU Yu-xiang, GE Hong-juan, GUO Hai, ZHANG Ying-long   +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

Research on the Control Method of the PV Grid-Connected Inverter under an Asymmetrical Power Grid Fault

Energies, 2023
The negative-sequence current component and harmonic components generated when an asymmetrical fault occurs in the power grid seriously affect the normal operation of the photovoltaic (PV) grid-connected inverter.
Shiji Tian, Min Lu, Ruikang Wang, Di’an Liu   +3 more
doaj   +1 more source

Simulation of Linear Feedback Control of D-Statcom for Voltage Sag Mitigation [PDF]

, 2005
Recently, the demands of electrical supply by industries and domestics customers have increased tremendously. This is due to the increase of large loads which are sensitive in industries like semiconductor and the building of new housing estates ...
Zulkifli, Shamsul Aizam
core  

Post-merger Signatures of Red-sequence Galaxies in Rich Abell Clusters at $z\lesssim 0.1$

, 2012
We have investigated the post-merger signatures of red-sequence galaxies in rich Abell clusters at $z \lesssim$ 0.1: A119, A2670, A3330 and A389. Deep images in u', g', r' and medium-resolution galaxy spectra were taken using MOSAIC 2 CCD and Hydra MOS ...
Bell, Bower, Bundy, Carlberg, Chang H. Ree, Drory, Faber, Jaehyun Lee, Jannuzi, Jiang, Kang, Kaviraj, Kimm, Lupton, Markwardt, Schlege, Smith, Stanford, Sukyoung K. Yi, Valdes, van Dokkum, Yi, Yun-Kyeong Sheen   +22 more
core   +1 more source

Massive Increase, Spread, and Exchange of Extended Spectrum {beta}-Lactamase-Encoding Genes Among Intestinal Enterobacteriaceae in Hospitalized Children With Severe Acute Malnutrition in Niger. [PDF]

, 2011
Background. From the time of CTX-M emergence, extended-spectrum β-lactamase-producing enterobacteria (ESBL-E) have spread worldwide in community settings as well as in hospitals, particularly in developing countries.
Andremont, A, Angebault, C, Armand-Lefèvre, L, Barbier, F, de Rekeneire, N, El Mniai, A, Hugede, H-C, Jacquier, H, Janssens, A-C, Page, A-L, Raskine, L, Ruppé, E, Sayadi, S, Woerther, P-L   +13 more
core   +2 more sources