I am mot sure I understand your problem. What exactly do you mean when you say your power factor (pf) is 100%? If you have a power factor of 1 already, that is already the highest you can have, though arguably it is safer to work at a slightly lower lagging pf of say, 0.98, even though it is slightly less efficient. Incidentally I find it hard to understand how you have a pf of 1; do you not have any induction motors driving e.g. fans, airconditioners pumps etc.?