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Line filter design for transformerless AC traction drives
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| Author(s) |
S. Dieckerhoff; S. Bernet |
| Abstract |
Multilevel converters are a feasible solution to drive future ac rail vehicles operating directly from the
15kV, 16.7Hz mains without a low-frequency line transformer. In today’s vehicles the stray
inductance of the transformer plays an important role filtering the harmonics generated by the line
converter. In transformerless drive systems the design of the line filter is a critical issue for reasons of
size and weight. This paper compares the harmonic spectra of single-phase multilevel converters as
the 3-level Neutral Point Clamped and the 3- and 4-level Flying Capacitor converter to the well known
2-level spectrum. It presents a filter design method and gives the required line filter size for a drive
system with four cascaded multilevel line converters. The results are compared to today’s transformer
and filter. |
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| Filename: | EPE2003-PP0178 - Dieckerhoff |
| Filesize: | 636.3 KB |
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| Type |
Members Only |
| Date |
Last modified 2003-10-15 by Unknown |
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