Three-Level Polynomial Pulse Width Modulation

This paper presents a pulse width modulation variation in order to overcome any drawback in the sampled reference signal due to its discretization. This discretization can be a problem in low switching frequency power converters; for instance, in Medium Voltage applications. This effect is amplified with interleaved power converter structures. The proposal is based on the polynomial linearization of the reference sampled point, instead of maintaining the reference constant in the whole switching update period. The graphical analysis is applied into three-phase, three-level power converter case study, but the conclusions can be extrapolated to any number of levels or any type of converter structure. The performance in one single and two interleaved power converters scenario scenarios is simulated in order to prove its superiority compared to the existing literature.