A Novel 19-level Asymmetrical Multilevel Inverter for Dynamic Voltage Restorer Applications
Devalraju Prasad, C. Dhanamjayulu
Abstract
A novel 19-level single-phase asymmetrical multilevel inverter with a reduced component topology is presented and to be designed. The designed structure proposed by the topology produces a maximum of 19 levels of output voltage with asymmetrical DC sources without H-bridge and can be used in DVR to improve power quality in the grid-connected renewable sources. This topology reduces the total number of components, cost, and system size. Instead of the multiple benefits of MLI, the presence of a higher component count to reduce THD makes reliability problems. The reliability with less THD is a critical challenge for researchers. Several parameters such as cost function (CF), total voltage standing (TSV), and power loss are analyzed for 19-level MLIs. A cost function is calculated from the total standing voltage, the proposed MLI is compared with several recently published topologies that are cost-effective. A thorough comparison with the graphic representation is carried out of several parameters. The MLI proposed is less compatible with the TSV and components requirement. The total harmonic distortion (THD) obtained is in accordance with the standards of IEEE. The topology is simulated using MATLAB/Simulink.