Single Phase Two-Stage Transformerless Five-Level Inverter for PV Applications

Abstract

Recently, reduced device count multilevel inverter is getting more attention for PV applications due to high efficiency, modularity, simplicity and compactness. Therefore, in this paper, a new single input DC source based two stage transformerless five-level inverter with reduced devices is presented. The front-end boost converter is capable to maintain dc link voltage across the capacitors to obtain the desired output voltage. Whereas the T-type inverter is used to generate the five level output voltage waveform by comparing a carrier waveform with two modulated sine signals. The proposed topology is tested for different conditions of load changes and modulation index in the MATLAB/Simulink software. Moreover, a comprehensive comparison is made with recently proposed topologies to highlight the merit of the proposed topology. Finally, concluding remarks are presented at the end.