Dhaka University Journal of Applied Science & Engineering

Multi-level power converters which provide more than two levels of voltage to achieve smoother and less distorted power conversion, have drawn much attention from the researchers especially in applications involving high voltage and high power utility. ln this work, cascaded H-Bridge type single phase seven-level inverter has been designed using vertically shifted carrier signals (VSCS) using sine-triangle pulse width modulation (SPWM) scheme. The designed PWM scheme provides less switching times and better output voltage with reduced total harmonic distortion (THD). Power converter topology and control methods in this paper are examined via computer simulation (PSIM Software) to determine the most suitable design and resulting output waveforms, harmonic spectrums are presented.

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