I read quite lot about connecting Ukraine power grid to EU. Small variations in frequency and phase are quite real problem. It is quite a big problem to synchro

I read quite lot about connecting Ukraine power grid to EU. Small variations in frequency and phase are quite real problem. It is quite a big problem to synchronise large international grids, and tiny PV inverter is really not build to do that! Plus from manual, most AC inverters have parasitic power factor on AC side. Some part of power inverter sends to grid, can be out of sync junk! Large spinning turbines with generator, are capable of absorbing out of sync junk to huge extend. But that may put turbine out of phase slightly. Current power grid was build around huge wheels spinning at the very same frequency.