For a class that's rather far outside of my background, I am reading a paper about supply-demand balance in an islanded microgrid. The active power demand of the whole system can be met with renewables, but the authors' control scheme can't balance reactive power, so they say that the conventional generators have to take care of it:
Thus, the active power reference of the SG is set to zero, and the SG [synchronous generator] only produces reactive power for voltage regulation.
Is that a thing? From dispatch and power flow exercises I'm used to having a minimum active power constraint on the generators.
How do you make, say, a diesel generator produce P=0 Q≠0?