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한문섭(M. S. Han),창상훈(S. H. Chang),신명철(M. C. Shin) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
A neutral section is installed around feeding substation(SS) and sectioning post(SP) that M?phase and Tphase are isolated in AC feeding system. Electric Train under “Notch?OFF” is operated by inertia within the neutral section. It causes disturbing the operation of electric trains for speed drop and driver’s mistakes. A automatic changeover system with thyristor recently have taken under development. In the paper, it is introduced the configuration of train detection system and performance testing on automatic changeover system..
오광해(K.H. Oh),이장무(C.M. Lee),창상훈(S.H. Chang),한문섭(M.S. Han),김길상(K.S. Kim) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Modern AC electric car has PWM(Pulse Width Modulation)-controlled converters, which give rise to higher harmonics. The current harmonics injected from AC electric car is propagated through power feeding circuit. As the feeding circuit is a distributed constant circuit composed of RLC, the capacitance of the feeding circuit and the inductance on the side of power system cause a parallel resonance and a magnification of current harmonics at a specific frequency. The magnified current harmonics usually brings about various problems. That is, the current harmonics makes interference in the adjacent lines of communications and the railway signalling system. Furthermore, in case it flows on the side of power system, not only overheating and vibration at the power capacitors but also wrong operation at the protective devices can occur. Therefore, the exact assessment of the harmonic current flow must be undertaken at design and planning stage for the electric traction systems. From these point of view, this study presents an approach to model and to analyse traction power feeding system focused on the amplification of harmonic current The proposed algorithm is applied to a standard AT(Auto-transformer)-fed test system in which electric car with PWM-controlled converters is running.
Prediction and Measurement for Harmonics on the Test Track of Seoul-Pusan High-speed Railway
오광해(K.H. Oh),이장무(C.M. Lee),한문섭(M.S. Han),이기원(K.W. Lee),권삼영(K.S. Kwon),창상훈(S.H. Chang),김길상(K.S. Kim) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper proposes a new model for harmonic analysis in 2×25㎸ traction power supply system including inverted feeder, contact line, rails and auto-transformer. The system model is based on four-port representation 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 described in the paper.