PWM controlled line-side converters of modern AC traction locomotives inject harmonic currents into the feeding overhead line. This causes problems of electromagnetic interference. Passive or active filters are usually provided for a partial reduction of the line harmonies. A novel and superior approach employs a switched electronic compensator. The compensator consists of two single-phase IGBT bridges operated at a maximum switching frequency of 1.5 kHz. It generates an exact replica of the harmonic current, feeding it to the highvoltage transformer to produce a harmonic counter magnetomotive force (MMF). The transformer main flux is then forced to be sinusoidal, and so is the induced voltage in the primary. The line current, being low-pass filtered by the transformer leakage inductance, assumes a pure sinusoidal waveform. The compensator operates in the low switching frequency range of the main power converters. Its installed power is only 1 % of the traction power. Operation, control, and design considerations are described. Results from laboratory tests at full power level are presented.
Total compensation of line-side switching harmonics in converter-fed AC locomotives
Vollständige Kompensation der netzseitigen Schaltoberschwingungen bei über Frequenzumrichter gespeisten Elektrolokomotiven
IEEE Transactions on Industry Applications ; 31 , 6 ; 1264-1273
1995
10 Seiten, 22 Bilder, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
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British Library Online Contents | 1993
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British Library Online Contents | 1993
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Engineering Index Backfile | 1930