Are M-G sets still available/in use?
Yes AC to DC MG-sets still are available ranging from kW to MW.

example



Prime mover :


Squirrel cage Induction motor 5 / 7.5HP, 440V AC, 3Phase, 50Hz, 1440rpm.


DC Generator:


3/5 kW, 220 or 440v, DC Shunt / Series / Compound generator 1440rpm. 
Both AC Motor and DC generator will be horizontal foot mounted type with flexible coupling, continuously rated, self ventilated dynamically balanced and will have E/B class Insulation confirming to IS 4722.


You just need to regulate it with a battery load to make it ripple-free.