Quasi Z-Source Neutral-Point-Clamped Inverter Using SVM Technique to Eliminate Common Mode Voltage

Abstract

In recent year, common mode voltage (CMV) elimination methods are considered to improve the reliability of three-level quasi-switched boost T-type inverter (TL-qSBT²I). The space-vector modulation method (SVM) can control the inverter operation to eliminate the CMV. The proposed method applies medium vectors and zero vector to synthesize the reference vector to eliminate CMV while the output voltage is unchanged compared to SinPWM technique. In order to prevent the active vectors and the output voltage from being affected, the shoot-through vector is inserted inside the zero vector. Accordingly, the proposed method not only maintains the CMV elimination advantage of the SVM technique for TL-qSBT²I but also reduces the inductor current ripple and enhances the voltage gain without any topology modification or adding electrical components. Results from simulations and experiments are used to evaluate the efficiency of the suggested strategy. Additionally, by comparing the proposed scheme with the traditional pulse-width modulation technique, the superiority of the proposed scheme is shown.