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Multicarrier pulse width modulation (MC-PWM) techniques such as Level-shifted PWM (LS-PWM) and Phase-shifted PWM (PS-PWM) are the popular methods to control the output voltage of Multilevel Inverters (MLIs). The advantage of LS-PWM techniques over PS-PWMs is that they produce better harmonic profile, but the un-equal power distribution problem of LS-PWMs imposes limitation to their usage in high power...
This paper proposes a new approach to calculate optimal firing angles of a Seven-Level Cascaded H-bridge Multilevel Inverter(CHB-MLI) using Gravitational Search Algorithm(GSA). The presence of more levels in the output voltage waveform of MLI introduces large harmonic content which should be reduced. Selective Harmonic Elimination(SHE) method is the popular technique used for eliminating the desired...
This paper proposes a new methodology of firing to increase the number of levels in the output voltage of a conventional seven-level inverter. In a conventional 7-level cascaded H bridge (CHB), by employing a new firing scheme with unequal DC sources, an output waveform of 21-levels has been generated. Thus near sinusoidal waveform has been achieved with the same number of switches. The simulation...
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