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The High Power Active Filter System for Harmonic Compensation of 25kv Electric Railway  

Kim, Jae-Chul (숭실대학교, 전기공학과)
Rho, Sung-Chan (한국철도대학, 전기제어과)
Lee, Yoo-Kyung (한국철도공사, 전기기술단)
Publication Information
Journal of the Korean Society for Railway / v.9, no.6, 2006 , pp. 761-765 More about this Journal
Abstract
At present, harmonic currents cause serious problems in power conversion system using the semiconductor switching device. Also some of the conversion system provokes harmonic currents against to the main power supply system and causes hindrances for the system. Main power impedance of the traditional LC passive filter method, influences on the filter characteristics and amplifies the harmonics when resonance phenomenon is occurred. And the traditional existing 2 level inverter systems show the limit in capacity of voltage and current in case of occurring sudden load change. So, to solve this problem active filter which uses cascaded H-bridge multi level inverter has been designed and ex-filter system circuits were totally investigated. With multi level active filtering system not only the size of filter but also the size of filter for transformer can be reduced by half and so as to the weight, while the capacity of inverter can be double sized and wave forms can be compensated exactly and precisely. Also by the benefit of the increase in rating capacity, the various currents owing to the load fluctuation can be dealt more steadily. In order to simulate the wave form of harmonics based on the measured data on the AC 25kV high speed Domestic Commercial railway, it was simulated with PSCAD/EMTDC and PSIM. Based on the results of this demonstration, the power supply system and inverter system would be more stable and also promoting its efficiency.
Keywords
Active Filter; H Bridge Cascaded; Carry PWM;
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  • Reference
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