A novel PWM model for cascaded H-bridge converters

This paper analyzed the essence of switch pulses and introduced a group of variables named pulse net area (PNA). Based upon the research on the PNA, the pulse width modulation (PWM) model for cascaded H-bridge converters was established. This model can be used to evaluate and optimize PWM methods. Three improved PWM methods were introduced. Experiment results proved the correctness and feasibility of the PWM model applied to the further research on the modulation method for cascaded H-bridge converters. It is practical to use the proposed model in establishing new modulation methods, reducing switching cost, and assessing the characteristics of certain modulation method for cascaded H-bridge converters.