New topology of cascaded multilevel inverter with reduced number of switches control considering lower order harmonics elimination

In this paper a new topology of cascaded H-bridge (CHB) multilevel inverter employing less number of switches, is presented. Different method regarding harmonic elimination has been proposed to eliminate the lower levels of harmonics in order to generate better power quality and lower total harmonic distortion (THD) waveform. Newton Raphson (N-R) algorithm is investigated for the selective harmonic elimination (SHE) to calculate switching angles for the proposed topology. Based on simulation studies, performance of the proposed algorithm for nine level modified cascaded H-bridge inverter, is evaluated and experimentally tested on a prototype using FPGA to implement SHE based on N-R algorithm.