High Voltage-Lift Quasi-Z-Source fed Modified Cascaded H-Bridge Multilevel Inverter

Quasi-Z-Source Cascaded H-bridge Multilevel inverters (qZS-CHB-MLI) have attracted much interest in recent research works due to its rewarding advantages when compared with traditional voltage source inverters and Z-source Inverters. The qZS-CHB-MLI has limited output voltage boosting capability, and requires more number of switches as the number of levels increases. This increases the volume and cost of the qZS-CHB-MLI with limited voltage boosting capability. In order to surmount these problems, a new Voltage-Lift Quasi-Z-Source Modified Cascaded H-Bridge Multilevel Inverter (VL-qZS-M-CHB-MLI) is presented in this paper. The proposed topology utilizes lower number of switches for generating seven level output voltage as compared with traditional qZS-CHB-MLI for the same voltage level. The presence of voltage-lift cell in the proposed topology significantly increases the voltage boosting capability, providing boosted output voltage with reduced Total Harmonic Distortion (THD). The performance of the proposed topology is confirmed through simulation results obtained using multicarrier PD-PWM with simple boost control technique.