transformer excitation current - isolation transformer used as auto-transformer

[zanydroid]

I saw some analysis that said a small imaginary component allowed much greater real component of power delivered. So a small price to pay to not throttle? I think it was about not exceeding max voltage.

In the case of the SMA whitepapers like what you linked.

The small imaginary component from utilization equipment originally corresponds to an acceptable power factor that does not cause power quality charges

With PV generated as active power only. A lot of the real component gets canceled out. But the imaginary component is untouched. That rotates the phasor into one of the bad regions.

So in this case, you get less profit from generating the PV, since it comes at the cost of higher power quality charges.

With PV generated with a small canceling out imaginary component, things are a lot better.

In this case, the incentives of the grid and the customer are sort of readily aligned.