solar pv micro-inverter strings
Solar Micro Inverters are DESIGNED to connect to a "stiff" 110 VAC (or 230VAC) bus. 

They synchronise in frequency and voltage and adjust phase angle to control energy transfer. In the absence of system wide control they maximise energy transfer based on available energy input and their maximum capacity.

Many such devices can be controlled by a centralised system but this is not essential to their operation.

They are largely, as you note, "plug and play".
Connect PV input,
Connect mains output to mains AC bus.
Done.