Filtering Techniques to Reduce the Transient Voltage of High Voltage Induction Motor on H-bridge cascaded 7- level Inverte

H-Bridge 7-레벨 인버터 구동시 고압 유도전동기에서 발생하는 과도전압 저감을 위한 필터기술

In this paper, we investigate a filtering technique to reduce the adverse effect of long motor leads on H-bridge cascaded 7-level inverter fed ac motor drive. The switching surge voltage becomes the major cause to occur the insulation failure by serious voltage stress in the stator winding of high voltage induction motor. However, the effect of switching surge appears un seriousin high voltage induction motor than low voltage induction motor. Consequently, we demonstrated that the filter connected to the motor terminals greatly reduces the transient voltage stress and ringing, moreover we show lowers the dv/dt of the inverter switching pulse. The results of simulation show the suppression of dv/dt and the reduced peak voltage at the motor end of a long cable.