A comparison of the packed U Cell structure and the most popular structures of multilevel inverters

Multilevel inverters are becoming essential for most high-voltage, high-power, and high-power medium-voltage electronic applications. MLIs offer many output levels suited to satisfy the varied demands of high-voltage and power applications. Besides enhancing output levels, MLI can reduce voltage stress (dv/dt) and the total harmonic distortion across the power switches. The extensive advancement of new MLI topologies on current ones enhances the ability to increase output levels while utilizing fewer components. Three significant topologies of multilevel inverters are compared in this work: cascaded H-bridge inverters, diode-clamped inverters, and flying capacitors. Electromagnetic interference (EMI) and total harmonic distortion results are compared. To do this comparison, meticulous MATLAB/Simulink simulations are used to analyze these inverters. These multilevel inverter designs frequently encounter complexity issues, highlighting the need for a more simplified approach. This study introduces a novel structure known as the 'packed u-cell 5 ' within the MATLAB/Simulink software. Its THD characteristics are analyzed to assess this novel structure's efficacy. By implementing PID control, the work also seeks to enhance the total harmonic distortion performance of the 'packed u-cell 5 ' structure.