openinverter forum

I am doing some tuning and I notice that there is currently no spot value for instantaneous AC current. There are a couple of approximations in the form of i1rms and i2rms, but I think it would be very useful to have an instantaneous value for the peak AC current. This can be calculated quite easily as follows:
The result of this calculation is demonstrated in the attached chart. I would suggest that GetIlMax could be replaced with this calculation as this will return what the max phase current *will* be, even if that peak hasn't been reached yet in any particular phase. This might also reduce oscillation when derating on AC current.
On a related note, I'm confused by why a SVM offset calculation is used in GetIlMax. As far as I know, SVM offset shouldn't impact current readings.

Sounds like a good idea.

On a related note, I'm confused by why a SVM offset calculation is used in GetIlMax. As far as I know, SVM offset shouldn't impact current readings.

I noticed a familiar 3*fstat ripple on ilmax which is compensated by more or less subtracting third harmonic. Sketchy, I know

I've written a patch to replace ilmax with my suggested version. On paper it should be perfect, but it's hard to confirm / demonstrate because the current sensors in the prius inverter have too much noise and DC offset to work well with my small test current.

https://github.com/catphish/stm32-sine/ ... 0131439f5f

The original version actually works very well, but in theory this version is more "correct".

Edit: This has now been merged into openinverter.