A New 29-Level Switched-Diode Multilevel Inverter with Optimal Device Count

Abstract

A novel single-phase 29-level asymmetrical switched-diode multilevel inverter (MLI) topology is presented in this paper with a reduced number of components. The developed topology can able to generate a maximum of 29-levels of output voltage using unequal DC sources. The basic 15-level MLI is developed and then further developed to 29-levels. The proposed topology reduces the circuit components, size and cost of the system. Apart from the several benefits of MLIs, reliability and accuracy plays a vital role because of the existence of more components count to reduce THD value. This can be considered as a major challenge employed to boost reliability without altering the best THD value. Various parameters are realized for both basic 15-level and the proposed 29-level switched-diode MLIs like total standing voltage (TSV), power loss, efficiency and cost function (CF). As the proposed MLI is undergone in dynamic load variations, the experimental results show the variations from R-load to L-load and L-load to R-load and it is found that the inverter is found to be stable throughout its operation. Experimental THD is represented, which is similar to the simulation THD which is under IEEE standards. TSV and cost factor of the proposed MLI is determined and is compared with several existing topologies and is observed to be cost-effective. A precise comparison is made on various parameters using graphical depiction. . The simulation for the proposed topology is done in MATLAB/Simulink and the experimental verification is done using the hardware prototype model under several conditions.