What is the optimal pulse number of a diode rectifier? Among variable frequency drives (VFD), the voltage source inverter with a diode rectifier is the most common all-rounder. However, there are several arrangements of the diode rectifier varying in the number of pulses. Is a 12-pulse rectifier sufficient? Do I Read more…
Network harmonics: Mitigation methods Today’s post focuses on harmonic mitigation methods. Let us review the most common, well proven methods of minimization of harmonic distortion on the grid side. Previous articles presented a general view on harmonics, their origin and effects [1]. The grid side harmonic spectrum of VFDs had Read more…
VFD harmonic spectrum Introduction After the theoretical introduction [1] we jump to variable frequency drives as sources of harmonics. This post is about VFD harmonic spectrum. As already mentioned, VFDs belong to non-linear devices with non-sinusoidal currents and/or voltages that they draw from the grid or inject into the grid. Read more…