A 5th and 7th order harmonic suppression scheme using capacitive filtering for 2-level VSI fed IM drive

Abstract

In this paper, a 5th and 7th harmonic suppression technique for a 2-level VSI fed IM drive, by using capacitive filtering is proposed. A capacitor fed 2-level inverter is used on an open-end winding induction motor to suppress all 5th and 7th order harmonics. A PWM scheme that maintains the capacitor voltage, while suppressing the harmonics is also proposed. The proposed scheme is valid for the entire modulation range, including overmodulation and six-step mode of operation of the main inverter.

Harmonics Distortion in Inverter-Fed Motor-Drive Systems: Case Study

“…Considering this critical issue, it is needed to study VSD-fed drives in terms of harmonics and their effects on the power quality of systems. As an extensive solution for AC drives' harmonics distortion, some harmonics were eliminated by using passive [5], [6] or active [7] filters. Using passive filters on the grid-side before the frequency converter decreases the currents harmonics notably.…”