THD Reduction using Cascaded DC-AC-DC-AC Multilevel Converter

In this work, a standalone DC-AC-DC-AC converter is designed and tested in MATLAB/SIMULINK to minimize the converter harmonics and power consumption for a short duration. The converter system comprises four stages, which include a medium frequency square voltage generator, a medium-frequency transformer, a center tap rectifier, and a full bridge converter. To form a multilevel topology, multiple DC-AC-DC-AC converters are cascaded. To verify the operation of the proposed converter, a thirteen-level off-grid converter is analyzed in MATLAB/Simulink. The simulation is carried out to evaluate the performance and behavior of the converter under rated operating conditions.