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we must not get confused and think very simply that soft-start and variable frequency drive have the same role. AC drives are more expensive and soft starters are not able to regulate frequency. There are many other considerations before deciding if a variable frequency drive or soft -start is needed for your load.
The question is about we have an unbalanced system under study and i found that power factor calculation does not obeys the well known geometrical relationship called power triangle nor the arithmetical relationship also.
However if I consider that reactive power is only an effect of the phase shift between the voltage and current the calculated power factor is almost the power factor measured.
I was recently trying to connect my Delta VFD E series drive with my laptop using Vfd-Soft software (which I downloaded from Delta website) and RJ 45 to USB converter(RS232/RS485 converter). I connected the variable frequency drive to supply and connected the connecting lead to drive and pc both.
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