C502 IMPROVEMENT MEASURES OF POWER QUALITY ON SEOUL-TAEGU LINE IN KYONBU HIGH SPEED RAILWAY

Abstract

This paper presents two power quality issues in electrified railway, voltage unbalance and harmonics. For a useful method to estimate voltage unbalance, power simulation procedure is added to the conventional formula. The proposed method can be practically used and easily applied to evaluation of voltage unbalance indices. For a new model to analyse harmonics in 2×25kV traction power supply system including inverted feeder, contact line, rails and auto-transformer, the system model based on eight-port representation is derived which is an extension of two-port network theory. In order to verify the proposed approach, we have analysed and tested real traction power feeding system focused on the amplification of harmonic current. The calculation results from the proposed approach and the measurement data from the test are widely discussed in the paper.