I'm trying to figure out how grid tie inverters work on a basic level. From what I understand, the inverter would have to
- monitor the grid wave
- create its own wave exactly like the grid
- make it a little bit higher voltage
- connect the two and then the power would flow into the grid
What I don't understand though is how it controls the amount of current going into the grid. Current is determined by voltage / resistance right, so, does the grid have a set resistance and does it just raise the voltage until desired amount of power flow is reached?
The grid having a set resistance makes no sense though, maybe it measures the resistance very quickly and then creates a tiny bit of charge at the appropriate voltage that gets dumped into the grid at that instance?
That option seems like it would make the grid wave messy though since there would be little discrete bumps on an otherwise nice sine wave.