Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
PAPERS
Harmonic Compensator for 50/60-Hz Fed AC Railway Vehicles
Masamichi OGASA
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2000 Volume 41 Issue 1 Pages 37-42

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Abstract

AC railway vehicles controlled by PWM line side converters inject harmonic current into the feeding overhead line. This causes problems such as resonance expansion which will lead to malfunctions or overcurrents at substations and electromagnetic interference with signalling systems. Normal active filters only shift the harmonic frequencies to a higher range. A novel harmonic compensator produces an exact counter mmf which becomes sinusoidal in the main transformer main flux then becomes sinusoidal. Experimental results from a small model of a Japanese AC railway vehicle are described. Especially, harmonic currents are very well suppressed in the 3-4 kHz frequency range that coincides with the signalling band. As a result, this novel harmonic compensator and its method appear promising for use in any 50 Hz, and 60 Hz fed PWM controlled AC railway traction system.

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© 2000 by Railway Technical Research Institute
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