Investigation Into The Computational Techniques
Of Power System Modelling For A DC Railway
Author(s)
A. Finlayson, C. J. Goodman & R. D. White
Abstract
The use of computer simulation techniques is now a fundamental part of the
design process for electrified railways and at the feasibility stage clients will
often request detailed calculations to be performed for the basic design. This will
establish a level of confidence in both the project and basic design parameters
that will justify the capital expenditure further on in the project life-cycle.
This paper will address how the total impedance of a railway network may be
represented, where the impedances of the traction return circuit and traction
power system are either combined together to form one impedance or studied
independent of one another. The accuracy of the modelling in this manner,
particularly how it affects the accuracy of rail voltage results shall be assessed. It
will also examine how much impedance is typically in the rails and what
proportion this needs to be before it has an unacceptable effect on the numerical
results. To assess this, a range of proportions will be studied, for example 70% of
the total impedance to be modelled in the conductor with 30% modelled in the
rails, 60%/40%, etc. In this way, a proper scientific assessment of the combined
or split calculation methods can be made via simplified case studies.
Keywords: DC railway, modelling, simulation, computational techniques,
accuracy, numerical method, rail voltage, stray current.
1 Introduction
DC electrified railway systems across the world are growing, both in passenger
and freight traffic, as an alternative solution to increasing road congestion. DC
electrified railways account for approximately 50% of electrified railway lines
throughout the world [1]. This growth may be in the form of new build railway
Keywords
DC railway, modelling, simulation, computational techniques,
accuracy, numerical method, rail voltage, stray current.
Related Book
Other papers in this volume
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