The ability of engine-powered generators to start and supply standby power of acceptable frequency and voltage within 10 seconds of a utility outage has made these generators the standby power system of choice for a wide variety of facilities including mission critical.
To this day, the greatest surprise of my life occurred when I was a young student at Berkeley Junior High. At the year-end assembly, unexpectedly, I heard my name called as they announced the recipient of the Seventh Grade Citizenship Award.
Reactors for AC drives are available as either AC reactors or DC reactors (DC link chokes). Both serve the same main purpose: to smooth the current flow to the AC drive, and reduce damaging harmonics produced on the power line.