Design and Implementation of Hybrid Asymmetric 15-Level Cascaded Modified H-Bridge Multilevel Inverter(CMHB-MLI) to reduce the Total Harmonics Distortion

Abstract

Abstract This new cascaded modified H-bridge asymmetrical multilevel inverter (CMHB-MLI) module proposes a 15 levels with three unequal dc sources and 10 switches. The design approaches with preferable advantage with greater quality comparatively to similar modules with minimum number of semiconductor switches utilizing lower switching frequency and less dc sources. Opposite phase disposition pulse width modulation (OPD-PWM) switching technique is utilized for controlling the Semiconductor switches in CMHB-MLI. In asymmetrical topology the input source are designed with unequal magnitude is done deliberately with binary nature of voltages such as 10Vdc, 20Vdc and 40Vdc. In asymmetrical designing of MLI produces a number of different output levels with the similar number of power semiconductor switches. The results are designed using MATLAB and hardware implementation validates improved quality performance with lower total harmonicsdistortion without utilizing any filtering circuit in the output with reduced switching stress.