There are a lot of terms involved, without a worksheet it's nearly impossible to understand what's the issue and how to solve it.

Hi. This is what the calculation of average driving power generally looks like, more or less.



IGBT Average Driving Power.sm (12.04 KiB) downloaded 1 time(s).

Regarding the error message, it might be because you're using `k` somewhere; the summation variable must be undefined. Try changing it to something else.

Best regards
Alvaro