Author(s)

D.B. He wings & G. Digby

Abstract

Probabilistic modelling of harmonic currents produced by AC locomotives D.B. He wings & G. Digby University of Wales, Singleton Park, Swansea, SA2 8PP, UK ABSTRACT The effective design and analysis of a modern ac electric railway requires a knowledge of system harmonics. Modern locomotives generally contain power electronic drives which generate substantial ac current harmonics. Conventional analysis of these harmonics involves the calculation of worst-case levels from a deterministic calculation. In practice, however, railway operation is such that a wide range of system conditions can exist, with locomotive demand, speed and position all contributing to the harmonic levels. On this basis, probabilistic analysis has been considered to give a more informative overview of system harmonics. Previous researchers have carried out a probabilistic analysis of traction system harmonics, based upon measurements taken from an operating railway. However, such measurements inheren

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