PWM spectrum evaluation and over-modulation phenomena in a three-phase inverters - analytical approach

This paper provides a comprehensive spectrum analysis of three-phase inverters’ output voltages. The output voltages were generated by triangular Pulse Width Modulation algorithm (PWM). This approach is presented in order to improve engineering education based on the classic analytical approach where the advantages of Bessel function series and calculation of Fourier coefficients have been used. The over-modulation phenomena were also considered. This analysis offers a complete quantitative and qualitative knowledge of those PWM signals necessary for high harmonics influence study when different passive and active loads are connected to inverters’ outputs.