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Modeling a VFD in SKM

Modeling a VFD in SKM

Modeling a VFD in SKM

(OP)
I have been using SKM for quite a few years for short circuit analysis and load flow calculations. I have always modeled VFD drives and DC drives as a Non-Motor Load. Is this the best and most accurate way to model these devices?

RE: Modeling a VFD in SKM

If the concern is the short-circuit contribution, then you should model as non-motor load, since the typical VFD will not contribute to fault current.  The only exception would be regenerative or four-quadrant type drives.  These can supply current to an upstream fault, but at a lower value than a motor running across-the-line.  

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