A Mixed AC/DC Model For Railway
Power Systems
Author(s)
J. Muñoz-Riesco, E. Pilo, A. Fernandez & P. Cucala
Abstract
A method to study railway power supply systems with AC power distribution
networks and DC power feeding is presented in this paper. The aim of this work
is to obtain a DC model of the whole system in which AC networks are
converted into equivalent DC ones.
Relationships between AC and DC quantities on both sides are set using the
equations of multiple bridge rectifiers as described in the literature. Particular
DC models for transformers and 3-phase lines are used to represent the
corresponding voltage drops. Specific base quantities are used for AC and DC
parts of the circuit in order to obtain a simplified circuit.
This model is used to solve a DC load flow problem. Real values of voltages,
intensities and power flows can be obtained by using the proper base quantities.
Additionally a correction has to be made to improve the power flow results
calculated previously, due to pure resistive representation of transformers and
AC lines, so a fine approximation is achieved.
Keywords: railways, AC/DC power supply system, equivalent DC model.
1 Introduction
Railways’ power systems usually have an AC division (zones close to
distribution networks) and a DC one (zones close to trains). This feature makes
those structures difficult to deal with when an electrical study is required to be
practised. Homogenization of the electrical circuit to AC or DC helps it to be
solved by means of a load flow problem.
Converting the whole circuit to AC provides exact results, but it involves a
great amount of variables and calculations.
Keywords
railways, AC/DC power supply system, equivalent DC model.
Related Book
Other papers in this volume
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