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

Journal Article · Wed Nov 01 04:00:00 EST 1995 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.475696· OSTI ID:186859

Krah, J O; Holtz, J ^[1]

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1. Univ. of Wuppertal (Germany)

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 harmonics. A novel and superior approach employs a switched electronic compensator. It generates an exact replica of the harmonic current, feeding it to the high-voltage transformer to produce a harmonic counter 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.

• OSTI ID: 186859
• Report Number(s): CONF-9410168--
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 6 Vol. 31; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
ELECTRIC RAILWAYS
ELECTRIC RESONANCE
INVERTERS
LOCOMOTIVES
OSCILLATION MODES
POWER CONDITIONING CIRCUITS