Optimal Choice of Frequency Modulation Index for Even-Order Harmonic Mitigation in a Space Vector Modulated Two-Level Inverter

Abstract

Space Vector Modulation (SVM) is a widely used PWM technique for two-level as well as multilevel inverters. The SVM technique is inherently half-wave asymmetric when the seven-segment switching scheme is employed with the aim of minimizing the device switching frequency, as a result of which even-order harmonics are present in the inverter output line voltage. A simple approach for the mitigation of the even-order harmonics is presented based on optimal choice of the frequency modulation index. The conclusions presented in the paper are derived from simulation studies on a two-level inverter.