The voltage sourced PWM rectifier is well established in the railway traction technology arena. Its primary use, on board locomotives, is converting the single phase AC overhead line voltage to a DC supply to drive variable speed induction motor drives. In this situation it is capable of providing a regulated DC voltage while maintaining unity power factor, low distortion current consumption, from the AC source. However, by far the majority of the existing traction systems employ DC motors. It is advantageous to upgrade the control equipment in these locomotives periodically to benefit from improvements in technology. The current sourced PWM rectifier offers the potential to be an ideal DC traction motor drive. However some practical problems in the area of control and power circuit design inhibit its usage. In particular because of the absence of a DC voltage link the design of efficient switching device snubbing systems is difficult. This paper presents a new modified current sourced rectifier that overcomes the snubbing problem. In addition through new control techniques the topology provides increased output voltage range which is a severe limitation of the traditional current sourced rectifier. Also four quadrant operation is possible without the necessity to reverse the DC motor field. This paper demonstrates the operation of the new converter topology through the use of a simulation model.
New topology current sourced PWM rectifier suitable for railway traction DC motor drives
Eine neue Schaltungstopologie eines Pulsweiten modulierten Stromwandlers für Gleichstromantriebe bei Wechselstrom versorgten Eisenbahnsystemen
1997
6 Seiten, 13 Bilder, 9 Quellen
Conference paper
English
Electric railway traction. Part 1: Electric traction and DC traction motor drives
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