EVALUATION AND REDUCTION OF HARMONIC DISTORTION CAUSED BY SOLID-STATEVOLTAGE CONTROLLERS OF INDUCTION-MOTORS

The harmonic distortion caused by a solid state AC voltage controller of an induction motor drive is evaluated. A conventional shunt harmoni c filter (SHF) for harmonic reduction for a group of such drives is co mpared with a harmonic blocking compensator (HBC). It is shown that th e HBC is more efficient in harmonic reduction than the SHF, especially , with distorted supply voltage. Moreover, the designer has more contr ol over the HBC than the SHF performance. The HBC, however, has a high er power rating than the SHF.