Need additional info;
1) What do you have in terms of PTs and CTs?
2) Does you exciter controls not presently control pf? What is the make /model of this controller (or is it embedded into the main generator controller)?
3) Where is setpoint coming from for this new pf controller?
4) Do you currently have a digital power meter associated with the gen-set? If so, make & model svp?
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)