An Exact Input Current Analysis of Ideal Static PWM Inverters

Abstract

The precise knowledge of current harmonics generated at the input of static pulsewidth modulated (PWM) inverters is essential in designing the input filter and in determining the interaction between the inverter and supply voltage bus. Despite its importance, however, this topic has been given mostly qualitative treatment. A novel harmonic analysis approach is employed with ideal static voltage source inverters to specify the harmonic spectra of their respective input currents. This information is subsequently used to compute the harmonic distortion of the input current and the ripple current for the input filter capacitor.