Study of Five Level Inverter for Harmonic Elimination

Abstract

Multilevel Inverter technology has emerged recently as a very important alternative in the area of high power, high voltage energy control. It came into picture and it has gained more attention in market for various applications like renewable energy systems, industrial motor drives, etc. It can generate stepped waveform by reducing harmonic distortion with increase in the number of voltage level. For high-power applications, cascaded H-bridge (CHB) inverters are conventionally controlled by selective harmonic Elimination (SHE) method. This technique is applied to reduce the switching loss and the optimized switching angles are calculated to mitigate low-order harmonics at the output voltage. Further the three phase five level CHB inverter is integrated with PV module as CHB inverter is suitable for PV application as each PV module act as a separate DC source for each CHB module. The simulation of three phase five level CHB inverter is done using MatLab R2010a version Software. The output shows better performance results of the proposed inverter.