Although AC drives have almost completely taken over from choppers for propulsion duties in the field of railway traction, there still remain important applications - rheostatic braking, refurbishment of camshaft equipment and in auxiliary systems - where the chopper continues to be an essential technology at the disposal of the designer . Four-quadrant PWM converters, despite their complexity and drawbacks, offer such good power-factor and posphometric current control that they have become the preferred type of AC-to-DC converter on 15 kV and 25 kV railways.
Power converters
2006-01-01
24 pages
Article (Journal)
English
electric propulsion , power converters , PWM power convertors , railway traction , four-quadrant PWM converters , rheostatic braking , 25 kV , power-factor , AC drives , choppers (circuits) , railway electrification , auxiliary systems , power factor , 15 kV , AC motor drives , propulsion choppers , braking , AC-DC power convertors , AC-to-DC converter , camshafts , posphometric current control , camshaft equipment , traction , refurbishment equipment
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