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// Example 9.6
// Determine (a) System kilowatts (b) System frequency (c) kilowatt loads
// carried by each machine
// Page 361
clc;
clear;
close;
// Given data
Pres=440; // Resistive load
PF=0.8; // Power factor
Pind=200; // Induction motor power
Palt=210; // Alternator bus load
deltaPa=70; // Change in load for machine A
f=60; // Frequency
deltaPb=70; // Change in load for machine B
deltaPc=70; // Change in load for machine C
// (a) System kilowatts
deltaPbus=Pres+PF*Pind; // Increase in bus load
Psys=Palt+deltaPbus;
// (b) System frequency
GDa=(60.2-f)/deltaPa; // Governor droop for machine A
GDb=(60.4-f)/deltaPb; // Governor droop for machine B
GDc=(60.6-f)/deltaPc; // Governor droop for machine C
// From the figure 9.18(b)
deltaF=600/(350+175+116.6667) ;
f2=f-deltaF;
// (c) Kilowatt loads carried by each machine
Pa2=deltaPa+350*deltaF;
Pb2=deltaPb+175*deltaF;
Pc2=deltaPc+116.6667*deltaF;
// Display result on command window
printf("\n System kilowatts = %0.0f kW ",Psys);
printf("\n System frequency = %0.2f Hz",f2);
printf("\n Kilowatt loads carried by machine A = %0.1f kW",Pa2);
printf("\n Kilowatt loads carried by machine B = %0.1f kW",Pb2);
printf("\n Kilowatt loads carried by machine C = %0.1f kW",Pc2);
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