z=2

Two synchronous generators and 50 Hz infinite bus system supply a load of 7 MVA with a power factor of 0.8. No-load frequencies of the generators are $1,2=52.5 Hz and fm1,2=51 Hz, respectively. Sp, is 1 MW/Hz and Spa is 1.5 MW/Hz. a. Determine the frequency of the system. Find the power sharing between the infinite bus system and 2 generators. Sketch the (P-f) graph. b. What will happen to the frequency and power sharing when loading level decreases (Z+10) %. Sketch the (P-f) graph. c. When the infinite bus system is disconnected and only 2 generators supply the new load, calculate the new frequency and the new power sharing between 2 generators. Sketch the (P-f) graph. d. If the loading level continues to decrease, for which loading level and system frequency one generator supplies nothing and the other generator supplies the whole load. Sketch the (P-f) graph. Two synchronous generators and 50 Hz infinite bus system supply a load of 7 MVA with a power factor of 0.8. No-load frequencies of the generators are $1,2=52.5 Hz and fm1,2=51 Hz, respectively. Sp, is 1 MW/Hz and Spa is 1.5 MW/Hz. a. Determine the frequency of the system. Find the power sharing between the infinite bus system and 2 generators. Sketch the (P-f) graph. b. What will happen to the frequency and power sharing when loading level decreases (Z+10) %. Sketch the (P-f) graph. c. When the infinite bus system is disconnected and only 2 generators supply the new load, calculate the new frequency and the new power sharing between 2 generators. Sketch the (P-f) graph. d. If the loading level continues to decrease, for which loading level and system frequency one generator supplies nothing and the other generator supplies the whole load. Sketch the (P-f) graph