I am doing a research about the electricity grid and a marketplace where neighbours can trade energy with each other.
I found out if your PV cell has excess energy you can with an inverter put it into the grid in 1 phase, or 3 phase if it's too much (>5kw). The question I am asked when I do presentations is: Does this work? And who does the frequency or voltage regulation?
Is it a real world problem or inverters are so good that they don't break the grid?
I also know if the grid goes out of specification the inverters are able to shut themselves down, so I got that going for me.
My professor questions if it is possible that neighbour A puts energy into the grid and then neighbour B takes it. Of course it won't be the same "energy" but the net difference on the grid will be 0 thus a "virtual" transaction. If grid operator agrees with this they might only have to pay a small transaction fee.