Transient Characteristics Analysis Based-on Circuit Models for a High-Speed Rail System

The main purpose of this study is to analyze the current leakage of the power grid due to the change in speed of high-speed rail (HSR). First, using PSIM software as the fundamental basis, this study constructed an overall HSR circuit-based model system, including Scott transformer, auto-transformer, and the track equivalent circuit and grounding system. In addition, this paper sought to study the current leakage transient responses of a train’s change in speed using this equivalent circuit model. Through simulation results, the study found that the dramatic change in DC voltage from a change in the speed of electric locomotives causes current leakage flowing through the high-speed rail power grid and a rise in ground potential. The study’s analysis results provide possible performance improvements to the high speed rail’s electric locomotives during changes in speed. Key-Words: High-Speed Rail System, Scott Transformer, Leakage Current, Transient Behavior.