Ratio between grid short-circuit power and VFD installed power Successful integration of a variable frequency drive (VFD) into the electric grid shall follow certain rules. Moreover, the VFD shall comply with standards related to power quality and harmonics. In case of 4-quadrant operation (regenerative type of VFD), additional requirements typically Read more…
Harmonic calculation versus network harmonic study As our regular reader you already have a solid knowledge about network harmonics caused by non-linear power electronic systems. It does not surprise you that network might have resonance(s) – a topic that needs to be addressed. Also, you are familiar with harmonic footprint Read more…
VFD multidrives: Grid harmonic performance This is the continuation of our short series on benefits of VFD multidrives [1]. We have already explained improved energy efficiency [2] and reduced footprint [3]. Today’s article focuses on grid harmonic performance and how a multidrive solution has the edge over individual single drives. 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…