Abstract:
In this paper various input current waveforms for a thyristor controlled
locomotive are discussed. A simulated input waveform may he used to study the
harmonic effects when the locomotive operates on a traction supply system. This
is especially suitable at the design stage when detailed locomotive parameters
are available. A comparison of the harmonic spectrums
of the simulated input waveform and an equivalent approximate input waveform indicates that the equivalent approximate input waveform can be satisfactorily used to study the harmonic effects in the autotransformer traction supply system in the absence of the detailed locomotive
parameters. It is
demonstrated that, with the help of a computer program developed for the
purpose, the equivalent approximate input waveform can he obtained with only
partial availability of locomotive parameters. Situations when the harmonic
effects are to he studied with only a knowledge of rated power and input power
to the locomotive may also arise. A computer program has been developed and
discussed in this paper that determines the parameters of the approximate input
waveform under such conditions. Other programs have also been developed which
simulate and determine the waveform parameters under a variety of conditions of
the availability of locomotive data. The resulting harmonic spectrum can then
be used by the simulator like the one developed by the author [3j, to determine the harmonic effects on the power supply system.