This paper presents a summary of power quality related concernsassociated with the applications of 12-pulse converter with DC motordrives in industrial plants. These concerns include power systemharmonics and harmonic distortion under unbalance voltage conditionduring voltage sags occurrence. The definition proposed focuses onsystem faults due to lightning. The voltage unbalance causes largeunbalance source currents resulting in excessive input current and highdistortion. The percentage of total harmonic distortion of input current(THDi) increased approximately 47% at 6 per unit of normalpeak current. The measurement and analysis of such events has beenperformed. Finally, the new phase-angle jump concept based on measuredtechniques is introduced
展开▼
