Two-phase controlled compensator for alternating-current quality improvement of electrified railway systems

2006 ◽  
Vol 153 (2) ◽  
pp. 177 ◽  
Author(s):  
L. Battistelli ◽  
D. Lauria ◽  
D. Proto
Keyword(s):  
Quality Improvement ◽  
Alternating Current ◽  
Two Phase ◽  
Railway Systems ◽  
Electrified Railway

scholarly journals On the determination of resistance in terms of mutual inductance

1925 ◽  
Vol 107 (742) ◽  
pp. 310-312 ◽  
Keyword(s):  
Alternating Current ◽  
Mutual Inductance ◽  
Two Phase ◽  
Measured Frequency ◽  
Electrostatic Voltmeter

Some years ago the author made a determination of the ohm in absolute units by two alternating-current methods, both of which depended on calculated standard of mutual inductance and a measured frequency. Each of those methods had certain disadvantages: the first required a very steady running two-phase alternator, and the limits of accuracy depended on the readings of an electrostatic voltmeter; the second method employed condenser as intermediary and required an assumption regarding the behaviour of the condenser which was probably not quite justifiable. The following method requires simpler apparatus than the two former and is free from the difficulties inherent in them. The connections are shown in the figure.

scholarly journals A Review on Power Electronics Technologies for Power Quality Improvement

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8585
Author(s):  
Joao L. Afonso ◽  
Mohamed Tanta ◽  
José Gabriel Oliveira Pinto ◽  
Luis F. C. Monteiro ◽  
Luis Machado ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Power Electronics ◽  
Power Quality ◽  
Smart Grids ◽  
Electrical Power ◽  
Power Grids ◽  
Electric Mobility ◽  
Solid State Transformers ◽  
Railway Systems ◽  
Power Quality Improvement

Nowadays, new challenges arise relating to the compensation of power quality problems, where the introduction of innovative solutions based on power electronics is of paramount importance. The evolution from conventional electrical power grids to smart grids requires the use of a large number of power electronics converters, indispensable for the integration of key technologies, such as renewable energies, electric mobility and energy storage systems, which adds importance to power quality issues. Addressing these topics, this paper presents an extensive review on power electronics technologies applied to power quality improvement, highlighting, and explaining the main phenomena associated with the occurrence of power quality problems in smart grids, their cause and effects for different activity sectors, and the main power electronics topologies for each technological solution. More specifically, the paper presents a review and classification of the main power quality problems and the respective context with the standards, a review of power quality problems related to the power production from renewables, the contextualization with solid-state transformers, electric mobility and electrical railway systems, a review of power electronics solutions to compensate the main power quality problems, as well as power electronics solutions to guarantee high levels of power quality. Relevant experimental results and exemplificative developed power electronics prototypes are also presented throughout the paper.

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