The New Hybrid Multilevel Inverter with Reduced Number of Switches
Law Kah Haw, Nur Atiqah Binti Jefry, Wong Kiing Ing
Abstract
This paper extended the findings of the previously proposed multilevel inverter (MLI) topology to produce 51-level of AC output voltage waveform in hybrid configuration. The proposed topology is structured by merging the feature of Cascaded H-bridge Multilevel inverter (CHB-MLI) and the Diode Clamped Multilevel Inverter (DC-MLI). When compared with the previous work, this proposed topology utilized 1 additional DC voltage source plus 4 switches (i.e., making it a total of 23 components) to achieve the aforementioned outcome. With such great number of voltage level being generated, the proposed topology also meets the total harmonic distortion (THD) limit set by IEEE standard (i.e., 5%) across the selected ranges of modulation indexes (i.e., 0.3 to 1). Through the simulation conducted via Matlab/Simulink, the variations between the number of voltage level, THD, and its RMS voltage are being analyzed and thoroughly discussed. The comparison of the proposed topology against the recently presented topologies are also carried to strengthen its novelty.