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전향보상기를 이용한 아크용접기용 3상 PWM 컨버터의 동특성 향상
구영모(Y.M.GU),최해룡(H.R.Choi),목형수(H.S.Mok),최규하(G.H. Choe),김규식(G.S.Kim),원충연(C.Y. Won) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
In general, DC power supply of arc-welding machine has been used to the diode rectifier. It's defect is the high current harmonics which bring about distortion of the utility currents. In this paper, using the three-phase PWM converter, the performance of arc-welding machine is improved by increasing the input power factor. When the diode rectifier in the arc-welding<br/> machine is replaced with three-phase PWM<br/> converter, PWM converter should control DC voltage of the output side. If PI controller is used for the output DC voltage regulator, the output DC voltage has high ripple voltage due to the instantaneous load variation in the<br/> arc-welding machine. In this paper, the feedforward compensator has been introduced to reduce the DC voltage ripple. It lessens the influence of load current that is the disturbance of the output DC voltage regulator. Theoretical prediction of this analysis has been testified shows results by comparing with experimental data.