Abstract -Multilevel inverters convert DC voltage to AC
voltage by using lower DC voltage at the input, with the help of an
electronically controlled device. However, one of the main
challenges associated with these devices is the Total Harmonic
Distortion (THD) of the output waveform. In this research paper,
a brief review of THD is presented for different cascaded H-bridge
multilevel inverter topologies, specifically five and seven-level
inverters (for example). The five-level inverter uses eight switches,
while the seven-level inverter uses twelve switches. Each single Hbridge inverter circuit is fed by independent DC sources. The
inverter employs an Insulated Gate Bipolar Transistor (IGBT) as
the switching point and a gating block to control the operation of
the IGBT switching. Simulation results and waveform analysis
are presented to validate the research. The study also explores the
effect of varying the switching frequency of the carrier wave on
the total harmonic distortion of the output waveform. The paper
emphasizes the importance of selecting an appropriate switching
frequency based on the application requirements to improve the
performance and efficiency of cascaded multilevel inverters.
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