Abstract
SummaryConventional traction vehicles for a.c.-mains contain a line-transformer in the propulsion chain. This transformer, especially for 15 kV/16.7 Hz main lines, is bulky, expensive and has high losses. This paper proposes a completely new transformerless configuration which reduces weight and dimensions of the drive power chain and improves the efficiency. On the line side, series connected voltage source inverters are directly connected via a line choke to the overhead line. This leads to d.c.-links on different voltage potentials, which ask for a new motor concept. The proposed 3-star induction motor with three independent 3-phase windings is fed by three 3-phase inverters on different voltage potentials. A new control structure for this 3-star induction motor becomes necessary and is proposed.
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