Passivity Analysis in Power Electronic Converters with SHE Modulation

To ensure the stability of modern power grids, particularly those dominated by power electronics, it is convenient for grid-connected converters to exhibit passivity across the entire frequency spectrum. Furthermore, it is interesting not only for the system to be passive, that is, for the converter system's resistance to be positive, but also for this resistance to have a high value, as it helps dampen potential grid resonances. This article presents a study of a grid-connected converter, achieving passivity and increasing the converter's resistance through control strategies. Given the growing use of Selective Harmonic Elimination (SHE) modulation techniques in high-power converters, the analysis will also focus on how to assess the passivity of a system employing these modulation techniques.