Gen Master With Dg Set & Utility Power

It is the load which lowers the power factor of the power delivering system. When power is drawn from utility, it is desirable to improve the power factor to unity. But when the power drawn from the DG Set, the power factor is not allowed to be improved beyond 0.95 as recommended by the DG set manufacturer. Also after the DG set is started, the load is increased on it gradually. While the load is less and if a fast switching APFC system is connected to it for PF correction, due to capacitor connection the DG set runs overexcited and starts hunting. These specific requirements does not allow the customer to use the same APFC system with DG set that is in use while power is drawn from utility. The customer needs to have two different APFC systems i.e. one for using on utility and other one for DG set, calling for additional investment.