A Study of Voltage Regulation of Auto Transformer in Railway Electrification System

Abstract

This paper presents a study of voltage regulation. In modeling of railway electrification
system, auto transformers are connected in parallel to reduce voltage quality problem in feeders
due to remote substation. In this work, modeling of railway electrification system is simulated
on DIgSILENT PowerFactory program. The results show the difference between ones with and
without connected auto transformer for voltage drop and voltage unbalance aspects. This paper
provides guidelines of transformer’s connection for railway system to solve the voltage quality.
Furthermore, the developed modeling of railway electrification system can be applied on studies
of stability problems on railway electrification system in future.