In Korea, a high speed train called as KTX (Korea Train eXpress) has started the revenue service since 2004. For KTX train, the current feed thyristor based on converter and inverter system is used as a traction system. So it is the source of the massive harmonics, and makes worse the power factor of the railway power line. Therefore it is needed the compensator or harmonic filter to improve the power quality of the railway power systems. In this paper, the 6 MVA single-phase active power filter for high speed train in Korea installed at the substation of the railway power system is introduced with the real data. Keywords-component; ative power filter, high speed train, power factor compensation, power qualityI.

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As an important element of the STATCOM, the passive component plays an indispensable role in the process of active and reactive energy storing and exchanging. However the coupling of the AC inductance and DC capacitance may lead to harmonic resonance. In order to investigate its influence on STATCOM performance, a simplified per unit model of STATCOM is developed in this paper. The relationship of the resonant frequency and the magnitudes of resonant AC current and DC voltage to the parameters of passive elements are derived. The good agreements between the analysis and the experimental results show that the model proposed here can be used in the selection of the passive parameters in the design of an actual STATCOM.