Performance of the Multicarrier Sinusoidal PWM-Based Multilevel Inverter With Reduced Power Loss and Fault Diagnosis Using Wavelets Transformation

The performances of multilevel inverters (MLIs) are of high competence when compared to the conventional two-level inverters due to reduced harmonic distortions, lower electromagnetic interference, and higher dc link voltages. However, the increased number of components, complex PWM control, and voltage-balancing problem, component failure in the circuit are some of the disadvantages. The topology preferred in this chapter provides a dc voltage in the shape of a staircase which approximates the rectified shape of a commanded sinusoidal wave to the bridge inverter, which in turn alternates the polarity to produce an AC voltage with lesser total harmonic distortion. This topology requires fewer components and hence it leads to a reduction of overall cost and complexity particularly for higher output voltage levels. The component fault diagnostic procedure is developed using wavelets transform tool. Finally, the experimental prototype is developed and validated with the simulation results for different loading conditions.