Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
High Harmonics Restraining Active Power Filter for AC Electric Vehicles
Takashi MAEDATomoki WATANABEMasanao SEKIMOTOKatsuyoshi HOSHITakashi SHIOTA
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2000 Volume 41 Issue 1 Pages 26-31


PWM-controlled line-side GTO converters of modern AC electric vehicles inject harmonic currents depending on their carrier frequency into the feeding overhead line. When they coincide with the variable resonance frequency of the line-distributed constants, the resonance currents become considerably high in amplitude and cause damage to the substations protection systems. Various counter-measures are taken to cope with this problem. In the case of trains equipped with a number of PWM converters, the problem is solved by the phase shifting operation method. For short trains, however, other solutions should be considered. Our proposal consists of parallel-connected active power filter. To verify the proposed method, a trial 200 kVA single-phase active power filter on board a vehicle was tested in the field and experimental results.

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© 2000 by Railway Technical Research Institute
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