Abstract
To control the output AC voltage of a Multilevel inverter (MLI) various modulation schemes are employed. Among them Multi carrier PWM is popular for its simplicity and computational ease, and is classified mainly in two types- Level-shifted pulse-width modulation (LSPWM) and phase-shifted pulse-width modulation (PSPWM) scheme based on carrier signal used. LSPWM for Cascaded H-bridge multilevel inverter produces better harmonic performance than the PSPWM scheme, but because of the uneven device conduction time its applications are limited to low power applications. By rotating the switching patterns in the Cascaded H- bridge cells the power losses can be evenly distributed. Combining the merits of equal device conduction period and even power distribution in H-bridge cell from PSPWM scheme & better harmonic performance from LSPWM scheme, two possible carrier rotation schemes are proposed. The two adopted techniques are simulated for seven level H-bridge cascaded multi-level inverter (MLI). Further, in this paper algorithms are proposed to establish evenness in devices conduction periods.
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