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.


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    Title :

    Total compensation of line-side switching harmonics in converter-fed AC locomotives


    Additional title:

    Vollständige Kompensation der netzseitigen Schaltoberschwingungen bei über Frequenzumrichter gespeisten Elektrolokomotiven


    Contributors:
    Krah, J.O. (author) / Holtz, J. (author)

    Published in:

    Publication date :

    1995


    Size :

    10 Seiten, 22 Bilder, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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