Abstract
This paper aims to compare the switching capabilities of the three most cited Pulse Width Modulation (PWM) control techniques in the application of three-phase Z-Source Inverters (ZSI). The Simple, Constant and Maximum Boost PWM control techniques are mathematically designed and applied to a 2 k-W ZSI and the critical performance metrics of the inverter, viz. the boost factor (B), voltage stress ratio across the switching components (Vstress) and the percentage of total harmonic distortion (%THD), are analyzed and compared for each of PWM control techniques. The Maximum boost control technique yield the highest boost factor however at a cost of increased %THD in the output power signals. The simple Boost PWM control incurs the highest Vstress across the switching components. The constant boost control is intermediate while the simple and maximum boost controls are the extremes for all three performance metrics. It is best to understand the performance characteristics associated with each PWM control technique to make an appropriate selection of the best-suited PWM control scheme for a particular application.
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