Performance Comparison of Asymmetrical Multilevel Inverter with Different Switching Techniques

In the present context, the asymmetrical multilevel inverter (AMLI) with minimal switches is extensively used to achieve high power quality across a load. The conventional inverter suffers from the disadvantages of large system components, low efficiency, high THD, high losses, etc. The asymmetrical multilevel inverter therefore offers an appropriate alternative to address the key issues of conventional inverters. The present paper aims to analyze the performance comparison of the proposed 15-level AMLI structure with different switching techniques, i.e., NLC, SHEPWM and SPWM. Moreover, loss analysis of the considered AMLI has been performed for different switching techniques. Furthermore, different performance parameters such as conduction losses, switching losses, total losses, THD, efficiency and power delivery of the inverter have been evaluated. It has been observed that the considered inverter topology offers the superior performance with the SHEPWM modulation technique at a modulation index of 0.8. Finally, hardware arrangement of the inverter has also been developed in the laboratory with a real-time Opal-RT 4510 simulator to verify the accuracy of simulation results.